zlib 1.2.2.3

ChangeLog

@@ -1,6 +1,68 @@
 
                 ChangeLog file for zlib
 
+Changes in 1.2.2.3 (27 May 2005)
+- Replace 1U constants in inflate.c and inftrees.c for 64-bit compile
+- Typecast fread() return values in gzio.c [Vollant]
+- Remove trailing space in minigzip.c outmode (VC++ can't deal with it)
+- Fix crc check bug in gzread() after gzungetc() [Heiner]
+- Add the deflateTune() function to adjust internal compression parameters
+- Add a fast gzip decompressor, gun.c, to examples (use of inflateBack)
+- Remove an incorrect assertion in examples/zpipe.c
+- Add C++ wrapper in infback9.h [Donais]
+- Fix bug in inflateCopy() when decoding fixed codes
+- Note in zlib.h how much deflateSetDictionary() actually uses
+- Remove USE_DICT_HEAD in deflate.c (would mess up inflate if used)
+- Add _WIN32_WCE to define WIN32 in zconf.in.h [Spencer]
+- Don't include stderr.h or errno.h for _WIN32_WCE in zutil.h [Spencer]
+- Add gzdirect() function to indicate transparent reads
+- Update contrib/minizip [Vollant]
+- Fix compilation of deflate.c when both ASMV and FASTEST [Oberhumer]
+- Add casts in crc32.c to avoid warnings [Oberhumer]
+- Add contrib/masmx64 [Vollant]
+- Update contrib/asm586, asm686, masmx86, testzlib, vstudio [Vollant]
+
+Changes in 1.2.2.2 (30 December 2004)
+- Replace structure assignments in deflate.c and inflate.c with zmemcpy to
+  avoid implicit memcpy calls (portability for no-library compilation)
+- Increase sprintf() buffer size in gzdopen() to allow for large numbers
+- Add INFLATE_STRICT to check distances against zlib header
+- Improve WinCE errno handling and comments [Chang]
+- Remove comment about no gzip header processing in FAQ
+- Add Z_FIXED strategy option to deflateInit2() to force fixed trees
+- Add updated make_vms.com [Coghlan], update README
+- Create a new "examples" directory, move gzappend.c there, add zpipe.c,
+  fitblk.c, gzlog.[ch], gzjoin.c, and zlib_how.html.
+- Add FAQ entry and comments in deflate.c on uninitialized memory access
+- Add Solaris 9 make options in configure [Gilbert]
+- Allow strerror() usage in gzio.c for STDC
+- Fix DecompressBuf in contrib/delphi/ZLib.pas [ManChesTer]
+- Update contrib/masmx86/inffas32.asm and gvmat32.asm [Vollant]
+- Use z_off_t for adler32_combine() and crc32_combine() lengths
+- Make adler32() much faster for small len
+- Use OS_CODE in deflate() default gzip header
+
+Changes in 1.2.2.1 (31 October 2004)
+- Allow inflateSetDictionary() call for raw inflate
+- Fix inflate header crc check bug for file names and comments
+- Add deflateSetHeader() and gz_header structure for custom gzip headers
+- Add inflateGetheader() to retrieve gzip headers
+- Add crc32_combine() and adler32_combine() functions
+- Add alloc_func, free_func, in_func, out_func to Z_PREFIX list
+- Use zstreamp consistently in zlib.h (inflate_back functions)
+- Remove GUNZIP condition from definition of inflate_mode in inflate.h
+  and in contrib/inflate86/inffast.S [Truta, Anderson]
+- Add support for AMD64 in contrib/inflate86/inffas86.c [Anderson]
+- Update projects/README.projects and projects/visualc6 [Truta]
+- Update win32/DLL_FAQ.txt [Truta]
+- Avoid warning under NO_GZCOMPRESS in gzio.c; fix typo [Truta]
+- Deprecate Z_ASCII; use Z_TEXT instead [Truta]
+- Use a new algorithm for setting strm->data_type in trees.c [Truta]
+- Do not define an exit() prototype in zutil.c unless DEBUG defined
+- Remove prototype of exit() from zutil.c, example.c, minigzip.c [Truta]
+- Add comment in zlib.h for Z_NO_FLUSH parameter to deflate()
+- Fix Darwin build version identification [Peterson]
+
 Changes in 1.2.2 (3 October 2004)
 - Update zlib.h comments on gzip in-memory processing
 - Set adler to 1 in inflateReset() to support Java test suite [Walles]

FAQ

@@ -148,13 +148,6 @@ The lastest zlib FAQ is at http://www.gzip.org/zlib/zlib_faq.html
     format using deflateInit2(). You can also request that inflate decode
     the gzip format using inflateInit2(). Read zlib.h for more details.
 
-    Note that you cannot specify special gzip header contents (e.g. a file
-    name or modification date), nor will inflate tell you what was in the
-    gzip header. If you need to customize the header or see what's in it,
-    you can use the raw deflate and inflate operations and the crc32()
-    function and roll your own gzip encoding and decoding. Read the gzip
-    RFC 1952 for details of the header and trailer format.
-
 21. Is zlib thread-safe?
 
     Yes. However any library routines that zlib uses and any application-
@@ -295,20 +288,29 @@ The lastest zlib FAQ is at http://www.gzip.org/zlib/zlib_faq.html
     were downright silly. So now, we simply make sure that the code always
     works.
 
-36. Will zlib read the (insert any ancient or arcane format here) compressed
+36. Valgrind (or some similar memory access checker) says that deflate is
+    performing a conditional jump that depends on an uninitialized value.
+    Isn't that a bug?
+
+    No.  That is intentional for performance reasons, and the output of
+    deflate is not affected.  This only started showing up recently since
+    zlib 1.2.x uses malloc() by default for allocations, whereas earlier
+    versions used calloc(), which zeros out the allocated memory.
+
+37. Will zlib read the (insert any ancient or arcane format here) compressed
     data format?
 
     Probably not. Look in the comp.compression FAQ for pointers to various
     formats and associated software.
 
-37. How can I encrypt/decrypt zip files with zlib?
+38. How can I encrypt/decrypt zip files with zlib?
 
     zlib doesn't support encryption. The original PKZIP encryption is very weak
     and can be broken with freely available programs. To get strong encryption,
     use GnuPG, http://www.gnupg.org/ , which already includes zlib compression.
     For PKZIP compatible "encryption", look at http://www.info-zip.org/
 
-38. What's the difference between the "gzip" and "deflate" HTTP 1.1 encodings?
+39. What's the difference between the "gzip" and "deflate" HTTP 1.1 encodings?
 
     "gzip" is the gzip format, and "deflate" is the zlib format. They should
     probably have called the second one "zlib" instead to avoid confusion
@@ -324,14 +326,14 @@ The lastest zlib FAQ is at http://www.gzip.org/zlib/zlib_faq.html
 
     Bottom line: use the gzip format for HTTP 1.1 encoding.
 
-39. Does zlib support the new "Deflate64" format introduced by PKWare?
+40. Does zlib support the new "Deflate64" format introduced by PKWare?
 
     No. PKWare has apparently decided to keep that format proprietary, since
     they have not documented it as they have previous compression formats.
     In any case, the compression improvements are so modest compared to other
     more modern approaches, that it's not worth the effort to implement.
 
-40. Can you please sign these lengthy legal documents and fax them back to us
+41. Can you please sign these lengthy legal documents and fax them back to us
     so that we can use your software in our product?
 
     No. Go away. Shoo.

Makefile

@@ -30,7 +30,7 @@ CPP=$(CC) -E
 
 LIBS=libz.a
 SHAREDLIB=libz.so
-SHAREDLIBV=libz.so.1.2.2
+SHAREDLIBV=libz.so.1.2.2.3
 SHAREDLIBM=libz.so.1
 
 AR=ar rc

Makefile.in

@@ -30,7 +30,7 @@ CPP=$(CC) -E
 
 LIBS=libz.a
 SHAREDLIB=libz.so
-SHAREDLIBV=libz.so.1.2.2
+SHAREDLIBV=libz.so.1.2.2.3
 SHAREDLIBM=libz.so.1
 
 AR=ar rc

README

@@ -1,6 +1,6 @@
 ZLIB DATA COMPRESSION LIBRARY
 
-zlib 1.2.2 is a general purpose data compression library.  All the code is
+zlib 1.2.2.3 is a general purpose data compression library.  All the code is
 thread safe.  The data format used by the zlib library is described by RFCs
 (Request for Comments) 1950 to 1952 in the files
 http://www.ietf.org/rfc/rfc1950.txt (zlib format), rfc1951.txt (deflate format)
@@ -16,9 +16,8 @@ minigzip.c.
 
 To compile all files and run the test program, follow the instructions given at
 the top of Makefile. In short "make test; make install" should work for most
-machines. For Unix: "./configure; make test; make install" For MSDOS, use one
-of the special makefiles such as Makefile.msc. For VMS, use Make_vms.com or
-descrip.mms.
+machines. For Unix: "./configure; make test; make install". For MSDOS, use one
+of the special makefiles such as Makefile.msc. For VMS, use make_vms.com.
 
 Questions about zlib should be sent to <zlib@gzip.org>, or to Gilles Vollant
 <info@winimage.com> for the Windows DLL version. The zlib home page is
@@ -34,7 +33,7 @@ Mark Nelson <markn@ieee.org> wrote an article about zlib for the Jan. 1997
 issue of  Dr. Dobb's Journal; a copy of the article is available in
 http://dogma.net/markn/articles/zlibtool/zlibtool.htm
 
-The changes made in version 1.2.2 are documented in the file ChangeLog.
+The changes made in version 1.2.2.3 are documented in the file ChangeLog.
 
 Unsupported third party contributions are provided in directory "contrib".
 

adler32.c

@@ -1,5 +1,5 @@
 /* adler32.c -- compute the Adler-32 checksum of a data stream
- * Copyright (C) 1995-2003 Mark Adler
+ * Copyright (C) 1995-2004 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
@@ -12,12 +12,13 @@
 #define NMAX 5552
 /* NMAX is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */
 
-#define DO1(buf,i)  {s1 += buf[i]; s2 += s1;}
+#define DO1(buf,i)  {adler += (buf)[i]; sum2 += adler;}
 #define DO2(buf,i)  DO1(buf,i); DO1(buf,i+1);
 #define DO4(buf,i)  DO2(buf,i); DO2(buf,i+2);
 #define DO8(buf,i)  DO4(buf,i); DO4(buf,i+4);
 #define DO16(buf)   DO8(buf,0); DO8(buf,8);
 
+/* use NO_DIVIDE if your processor does not do division in hardware */
 #ifdef NO_DIVIDE
 #  define MOD(a) \
     do { \
@@ -39,8 +40,17 @@
         if (a >= (BASE << 1)) a -= (BASE << 1); \
         if (a >= BASE) a -= BASE; \
     } while (0)
+#  define MOD4(a) \
+    do { \
+        if (a >= (BASE << 4)) a -= (BASE << 4); \
+        if (a >= (BASE << 3)) a -= (BASE << 3); \
+        if (a >= (BASE << 2)) a -= (BASE << 2); \
+        if (a >= (BASE << 1)) a -= (BASE << 1); \
+        if (a >= BASE) a -= BASE; \
+    } while (0)
 #else
 #  define MOD(a) a %= BASE
+#  define MOD4(a) a %= BASE
 #endif
 
 /* ========================================================================= */
@@ -49,26 +59,91 @@ uLong ZEXPORT adler32(adler, buf, len)
     const Bytef *buf;
     uInt len;
 {
-    unsigned long s1 = adler & 0xffff;
-    unsigned long s2 = (adler >> 16) & 0xffff;
-    int k;
+    unsigned long sum2;
+    unsigned n;
 
-    if (buf == Z_NULL) return 1L;
+    /* split Adler-32 into component sums */
+    sum2 = (adler >> 16) & 0xffff;
+    adler &= 0xffff;
 
-    while (len > 0) {
-        k = len < NMAX ? (int)len : NMAX;
-        len -= k;
-        while (k >= 16) {
+    /* in case user likes doing a byte at a time, keep it fast */
+    if (len == 1) {
+        adler += buf[0];
+        if (adler >= BASE)
+            adler -= BASE;
+        sum2 += adler;
+        if (sum2 >= BASE)
+            sum2 -= BASE;
+        return adler | (sum2 << 16);
+    }
+
+    /* initial Adler-32 value (deferred check for len == 1 speed) */
+    if (buf == Z_NULL)
+        return 1L;
+
+    /* in case short lengths are provided, keep it somewhat fast */
+    if (len < 16) {
+        while (len--) {
+            adler += *buf++;
+            sum2 += adler;
+        }
+        if (adler >= BASE)
+            adler -= BASE;
+        MOD4(sum2);             /* only added so many BASE's */
+        return adler | (sum2 << 16);
+    }
+
+    /* do length NMAX blocks -- requires just one modulo operation */
+    while (len >= NMAX) {
+        len -= NMAX;
+        n = NMAX / 16;          /* NMAX is divisible by 16 */
+        do {
+            DO16(buf);          /* 16 sums unrolled */
+            buf += 16;
+        } while (--n);
+        MOD(adler);
+        MOD(sum2);
+    }
+
+    /* do remaining bytes (less than NMAX, still just one modulo) */
+    if (len) {                  /* avoid modulos if none remaining */
+        while (len >= 16) {
+            len -= 16;
             DO16(buf);
             buf += 16;
-            k -= 16;
         }
-        if (k != 0) do {
-            s1 += *buf++;
-            s2 += s1;
-        } while (--k);
-        MOD(s1);
-        MOD(s2);
+        while (len--) {
+            adler += *buf++;
+            sum2 += adler;
+        }
+        MOD(adler);
+        MOD(sum2);
     }
-    return (s2 << 16) | s1;
+
+    /* return recombined sums */
+    return adler | (sum2 << 16);
+}
+
+/* ========================================================================= */
+uLong ZEXPORT adler32_combine(adler1, adler2, len2)
+    uLong adler1;
+    uLong adler2;
+    z_off_t len2;
+{
+    unsigned long sum1;
+    unsigned long sum2;
+    unsigned rem;
+
+    /* the derivation of this formula is left as an exercise for the reader */
+    rem = (unsigned)(len2 % BASE);
+    sum1 = adler1 & 0xffff;
+    sum2 = rem * sum1;
+    MOD(sum2);
+    sum1 += (adler2 & 0xffff) + BASE - 1;
+    sum2 += ((adler1 >> 16) & 0xffff) + ((adler2 >> 16) & 0xffff) + BASE - rem;
+    if (sum1 > BASE) sum1 -= BASE;
+    if (sum1 > BASE) sum1 -= BASE;
+    if (sum2 > (BASE << 1)) sum2 -= (BASE << 1);
+    if (sum2 > BASE) sum2 -= BASE;
+    return sum1 | (sum2 << 16);
 }

as400/zlib.inc

@@ -1,7 +1,7 @@
       *  ZLIB.INC - Interface to the general purpose compression library
       *
       *  ILE RPG400 version by Patrick Monnerat, DATASPHERE.
-      *  Version 1.2.2
+      *  Version 1.2.2.3
       *
       *
       *  WARNING:
@@ -20,8 +20,12 @@
       *                               Constants
       **************************************************************************
       *
-     D ZLIB_VERSION    C                   '1.2.2'                            Header's version
-     D ZLIB_VERNUM     C                   X'1220'
+      *  Versioning information.
+      *
+     D ZLIB_VERSION    C                   '1.2.2.3'
+     D ZLIB_VERNUM     C                   X'1223'
+      *
+      *  Other equates.
       *
      D Z_NO_FLUSH      C                   0
      D Z_SYNC_FLUSH    C                   2

compress.c

@@ -1,5 +1,5 @@
 /* compress.c -- compress a memory buffer
- * Copyright (C) 1995-2002 Jean-loup Gailly.
+ * Copyright (C) 1995-2003 Jean-loup Gailly.
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 

configure

@@ -89,7 +89,7 @@ if test "$gcc" -eq 1 && ($cc -c $cflags $test.c) 2>/dev/null; then
              SHAREDLIB=libz$shared_ext
              SHAREDLIBV=libz.$VER$shared_ext
              SHAREDLIBM=libz.$VER1$shared_ext
-             LDSHARED=${LDSHARED-"$cc -dynamiclib -install_name $libdir/$SHAREDLIBV -compatibility_version $VER2 -current_version $VER"};;
+             LDSHARED=${LDSHARED-"$cc -dynamiclib -install_name $libdir/$SHAREDLIBM -compatibility_version $VER1 -current_version $VER"};;
   *)             LDSHARED=${LDSHARED-"$cc -shared"};;
   esac
 else
@@ -125,6 +125,9 @@ else
   SunOS\ 4*) SFLAGS=${CFLAGS-"-O2 -PIC"}
              CFLAGS=${CFLAGS-"-O2"}
              LDSHARED=${LDSHARED-"ld"};;
+  SunStudio\ 9*) SFLAGS=${CFLAGS-"-DUSE_MMAP -fast -xcode=pic32 -xtarget=ultra3 -xarch=v9b"}
+             CFLAGS=${CFLAGS-"-DUSE_MMAP -fast -xtarget=ultra3 -xarch=v9b"}
+             LDSHARED=${LDSHARED-"cc -xarch=v9b"};;
   UNIX_System_V\ 4.2.0)
              SFLAGS=${CFLAGS-"-KPIC -O"}
              CFLAGS=${CFLAGS-"-O"}

contrib/README.contrib

@@ -22,9 +22,6 @@ delphi/     by Cosmin Truta <cosmint@cs.ubbcluj.ro>
 dotzlib/    by Henrik Ravn <henrik@ravn.com>
         Support for Microsoft .Net and Visual C++ .Net
 
-gzappend/   by Mark Adler <madler@alumni.caltech.edu>
-        append to a gzip file -- illustrates the use of Z_BLOCK
-
 infback9/   by Mark Adler <madler@alumni.caltech.edu>
         Unsupported diffs to infback to decode the deflate64 format
 
@@ -45,6 +42,10 @@ masm686/    by Dan Higdon <hdan@kinesoft.com>
             and Chuck Walbourn <chuckw@kinesoft.com>
         asm code for Pentium Pro/PII, using the MASM syntax
 
+masmx64/    by Gilles Vollant <info@winimage.com>
+	x86 64-bit (AMD64 and Intel EM64t) code for x64 assembler to
+	replace longest_match() and inflate_fast()
+
 masmx86/    by Gilles Vollant <info@winimage.com>
         x86 asm code to replace longest_match() and inflate_fast(),
         for Visual C++ and MASM

contrib/asm586/match.S

@@ -45,19 +45,29 @@
  * program to crash horribly, without so much as a warning at
  * compile time. Sigh.)
  */
-#define	dsWSize			36
-#define	dsWMask			44
-#define	dsWindow		48
-#define	dsPrev			56
-#define	dsMatchLen		88
-#define	dsPrevMatch		92
-#define	dsStrStart		100
-#define	dsMatchStart		104
-#define	dsLookahead		108
-#define	dsPrevLen		112
-#define	dsMaxChainLen		116
-#define	dsGoodMatch		132
-#define	dsNiceMatch		136
+
+/* All the +zlib1222add offsets are due to the addition of fields
+ *  in zlib in the deflate_state structure since the asm code was first written
+ * (if you compile with zlib 1.0.4 or older, use "zlib1222add equ (-4)").
+ * (if you compile with zlib between 1.0.5 and 1.2.2.1, use "zlib1222add equ 0").
+ * if you compile with zlib 1.2.2.2 or later , use "zlib1222add equ 8").
+ */
+
+#define zlib1222add		(8)
+
+#define	dsWSize			(36+zlib1222add)
+#define	dsWMask			(44+zlib1222add)
+#define	dsWindow		(48+zlib1222add)
+#define	dsPrev			(56+zlib1222add)
+#define	dsMatchLen		(88+zlib1222add)
+#define	dsPrevMatch		(92+zlib1222add)
+#define	dsStrStart		(100+zlib1222add)
+#define	dsMatchStart		(104+zlib1222add)
+#define	dsLookahead		(108+zlib1222add)
+#define	dsPrevLen		(112+zlib1222add)
+#define	dsMaxChainLen		(116+zlib1222add)
+#define	dsGoodMatch		(132+zlib1222add)
+#define	dsNiceMatch		(136+zlib1222add)
 
 
 .file "match.S"

contrib/asm686/match.S

@@ -38,26 +38,28 @@
 #define	deflatestate		56	/* the function arguments	*/
 #define	curmatch		60
 
-/* Offsets for fields in the deflate_state structure. These numbers
- * are calculated from the definition of deflate_state, with the
- * assumption that the compiler will dword-align the fields. (Thus,
- * changing the definition of deflate_state could easily cause this
- * program to crash horribly, without so much as a warning at
- * compile time. Sigh.)
+/* All the +zlib1222add offsets are due to the addition of fields
+ *  in zlib in the deflate_state structure since the asm code was first written
+ * (if you compile with zlib 1.0.4 or older, use "zlib1222add equ (-4)").
+ * (if you compile with zlib between 1.0.5 and 1.2.2.1, use "zlib1222add equ 0").
+ * if you compile with zlib 1.2.2.2 or later , use "zlib1222add equ 8").
  */
-#define	dsWSize			36
-#define	dsWMask			44
-#define	dsWindow		48
-#define	dsPrev			56
-#define	dsMatchLen		88
-#define	dsPrevMatch		92
-#define	dsStrStart		100
-#define	dsMatchStart		104
-#define	dsLookahead		108
-#define	dsPrevLen		112
-#define	dsMaxChainLen		116
-#define	dsGoodMatch		132
-#define	dsNiceMatch		136
+
+#define zlib1222add		(8)
+
+#define	dsWSize			(36+zlib1222add)
+#define	dsWMask			(44+zlib1222add)
+#define	dsWindow		(48+zlib1222add)
+#define	dsPrev			(56+zlib1222add)
+#define	dsMatchLen		(88+zlib1222add)
+#define	dsPrevMatch		(92+zlib1222add)
+#define	dsStrStart		(100+zlib1222add)
+#define	dsMatchStart		(104+zlib1222add)
+#define	dsLookahead		(108+zlib1222add)
+#define	dsPrevLen		(112+zlib1222add)
+#define	dsMaxChainLen		(116+zlib1222add)
+#define	dsGoodMatch		(132+zlib1222add)
+#define	dsNiceMatch		(136+zlib1222add)
 
 
 .file "match.S"

contrib/delphi/ZLib.pas

@@ -344,7 +344,7 @@ begin
     strm.avail_out := OutBytes;
     DCheck(inflateInit_(strm, zlib_version, sizeof(strm)));
     try
-      while DCheck(inflate(strm, Z_FINISH)) <> Z_STREAM_END do
+      while DCheck(inflate(strm, Z_NO_FLUSH)) <> Z_STREAM_END do
       begin
         P := OutBuf;
         Inc(OutBytes, BufInc);

contrib/infback9/infback9.h

@@ -16,6 +16,10 @@
  * zlib.h must be included before this header file.
  */
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 ZEXTERN int ZEXPORT inflateBack9 OF((z_stream FAR *strm,
                                     in_func in, void FAR *in_desc,
                                     out_func out, void FAR *out_desc));
@@ -27,3 +31,7 @@ ZEXTERN int ZEXPORT inflateBack9Init_ OF((z_stream FAR *strm,
 #define inflateBack9Init(strm, window) \
         inflateBack9Init_((strm), (window), \
         ZLIB_VERSION, sizeof(z_stream))
+
+#ifdef __cplusplus
+}
+#endif

contrib/infback9/inftree9.c

@@ -1,5 +1,5 @@
 /* inftree9.c -- generate Huffman trees for efficient decoding
- * Copyright (C) 1995-2003 Mark Adler
+ * Copyright (C) 1995-2005 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
@@ -9,7 +9,7 @@
 #define MAXBITS 15
 
 const char inflate9_copyright[] =
-   " inflate9 1.2.2 Copyright 1995-2004 Mark Adler ";
+   " inflate9 1.2.2.3 Copyright 1995-2005 Mark Adler ";
 /*
   If you use the zlib library in a product, an acknowledgment is welcome
   in the documentation of your product. If for some reason you cannot
@@ -64,7 +64,7 @@ unsigned short FAR *work;
     static const unsigned short lext[31] = { /* Length codes 257..285 extra */
         128, 128, 128, 128, 128, 128, 128, 128, 129, 129, 129, 129,
         130, 130, 130, 130, 131, 131, 131, 131, 132, 132, 132, 132,
-        133, 133, 133, 133, 144, 199, 198};
+        133, 133, 133, 133, 144, 66, 71};
     static const unsigned short dbase[32] = { /* Distance codes 0..31 base */
         1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49,
         65, 97, 129, 193, 257, 385, 513, 769, 1025, 1537, 2049, 3073,

contrib/inflate86/inffast.S

@@ -188,17 +188,8 @@
 /*
  * typedef enum inflate_mode consts, in inflate.h
  */
-#ifndef NO_GUNZIP
-#define GUNZIP
-#endif
-
-#ifdef GUNZIP
 #define INFLATE_MODE_TYPE 11  /* state->mode flags enum-ed in inflate.h */
 #define INFLATE_MODE_BAD  26
-#else
-#define INFLATE_MODE_TYPE 3
-#define INFLATE_MODE_BAD  17
-#endif
 
 
 #if ! defined( USE_MMX ) && ! defined( NO_MMX )

contrib/masm686/match.asm

@@ -12,6 +12,8 @@
 ; Based on match.S
 ; Written for zlib 1.1.2
 ; Copyright (C) 1998 Brian Raiter <breadbox@muppetlabs.com>
+;
+; Modified by Gilles Vollant (2005) for add gzhead and gzindex
 
 	.686P
 	.MODEL	FLAT
@@ -39,6 +41,9 @@ ds_pending_buf_size	dd ?
 ds_pending_out		dd ?
 ds_pending		dd ?
 ds_wrap			dd ?
+; gzhead and gzindex are added in zlib 1.2.2.2 (see deflate.h)
+ds_gzhead               dd ?
+ds_gzindex              dd ?
 ds_data_type		db ?
 ds_method		db ?
 			db ?	; padding

contrib/masmx64/bld_ml64.bat

@@ -0,0 +1,2 @@
+ml64.exe /Flinffasx64 /c /Zi inffasx64.asm
+ml64.exe /Flgvmat64   /c /Zi gvmat64.asm

contrib/masmx64/gvmat64.asm

@@ -0,0 +1,464 @@
+;uInt longest_match_x64(
+;    deflate_state *s,
+;    IPos cur_match);                             /* current match */
+
+; gvmat64.asm -- Asm portion of the optimized longest_match for 32 bits x86
+; Copyright (C) 1995-2005 Jean-loup Gailly, Brian Raiter and Gilles Vollant.
+; File written by Gilles Vollant, by modifiying the longest_match
+;  from Jean-loup Gailly in deflate.c
+;  and modifying asm686 with masm, optimised assembly code from Brian Raiter,
+;      written 1998
+;         http://www.zlib.net
+;         http://www.winimage.com/zLibDll
+;         http://www.muppetlabs.com/~breadbox/software/assembly.html
+;
+; to compile this file, I use option
+;   ml64.exe /Flgvmat64 /c /Zi gvmat64.asm
+;   with Microsoft Macro Assembler (x64) for AMD64
+;
+;   ml64.exe is given with Visual Studio 2005, Windows 2003 server DDK
+;
+;   (you can get Windows 2003 server DDK with ml64 and cl for AMD64 from
+;      http://www.microsoft.com/whdc/devtools/ddk/default.mspx for low price)
+;
+; Be carrefull to adapt zlib1222add below to your version of zLib
+
+
+;uInt longest_match(s, cur_match)
+;    deflate_state *s;
+;    IPos cur_match;                             /* current match */
+.code
+longest_match PROC
+
+
+;LocalVarsSize   equ 88
+ LocalVarsSize   equ 72
+
+; register used : rax,rbx,rcx,rdx,rsi,rdi,r8,r9,r10,r11,r12
+; free register :  r14,r15
+; register can be saved : rsp
+
+ chainlenwmask   equ  rsp + 8 - LocalVarsSize    ; high word: current chain len
+                                                 ; low word: s->wmask
+;window          equ  rsp + xx - LocalVarsSize   ; local copy of s->window ; stored in r10
+;windowbestlen   equ  rsp + xx - LocalVarsSize   ; s->window + bestlen , use r10+r11
+;scanstart       equ  rsp + xx - LocalVarsSize   ; first two bytes of string ; stored in r12w
+;scanend         equ  rsp + xx - LocalVarsSize   ; last two bytes of string use ebx
+;scanalign       equ  rsp + xx - LocalVarsSize   ; dword-misalignment of string r13
+;bestlen         equ  rsp + xx - LocalVarsSize   ; size of best match so far -> r11d
+;scan            equ  rsp + xx - LocalVarsSize   ; ptr to string wanting match -> r9
+ nicematch       equ  rsp + 16 - LocalVarsSize   ; a good enough match size -> r14
+
+save_rdi        equ  rsp + 24 - LocalVarsSize
+save_rsi        equ  rsp + 32 - LocalVarsSize
+save_rbx        equ  rsp + 40 - LocalVarsSize
+save_rbp        equ  rsp + 48 - LocalVarsSize
+save_r12        equ  rsp + 56 - LocalVarsSize
+save_r13        equ  rsp + 64 - LocalVarsSize
+;save_r14        equ  rsp + 72 - LocalVarsSize
+;save_r15        equ  rsp + 80 - LocalVarsSize
+
+
+
+;  all the +4 offsets are due to the addition of pending_buf_size (in zlib
+;  in the deflate_state structure since the asm code was first written
+;  (if you compile with zlib 1.0.4 or older, remove the +4).
+;  Note : these value are good with a 8 bytes boundary pack structure
+
+
+    MAX_MATCH           equ     258
+    MIN_MATCH           equ     3
+    MIN_LOOKAHEAD       equ     (MAX_MATCH+MIN_MATCH+1)
+
+
+;;; Offsets for fields in the deflate_state structure. These numbers
+;;; are calculated from the definition of deflate_state, with the
+;;; assumption that the compiler will dword-align the fields. (Thus,
+;;; changing the definition of deflate_state could easily cause this
+;;; program to crash horribly, without so much as a warning at
+;;; compile time. Sigh.)
+
+;  all the +zlib1222add offsets are due to the addition of fields
+;  in zlib in the deflate_state structure since the asm code was first written
+;  (if you compile with zlib 1.0.4 or older, use "zlib1222add equ (-4)").
+;  (if you compile with zlib between 1.0.5 and 1.2.2.1, use "zlib1222add equ 0").
+;  if you compile with zlib 1.2.2.2 or later , use "zlib1222add equ 8").
+
+zlib1222add     equ 8
+
+dsWSize         equ 56+zlib1222add+(zlib1222add/2)
+dsWMask         equ 64+zlib1222add+(zlib1222add/2)
+dsWindow        equ 72+zlib1222add
+dsPrev          equ 88+zlib1222add
+dsMatchLen      equ 128+zlib1222add
+dsPrevMatch     equ 132+zlib1222add
+dsStrStart      equ 140+zlib1222add
+dsMatchStart    equ 144+zlib1222add
+dsLookahead     equ 148+zlib1222add
+dsPrevLen       equ 152+zlib1222add
+dsMaxChainLen   equ 156+zlib1222add
+dsGoodMatch     equ 172+zlib1222add
+dsNiceMatch     equ 176+zlib1222add
+
+
+; parameter 1 in r8(deflate state s), param 2 in rdx (cur match)
+
+; see http://weblogs.asp.net/oldnewthing/archive/2004/01/14/58579.aspx and
+; http://msdn.microsoft.com/library/en-us/kmarch/hh/kmarch/64bitAMD_8e951dd2-ee77-4728-8702-55ce4b5dd24a.xml.asp
+;
+; All registers must be preserved across the call, except for
+;   rax, rcx, rdx, r8, r-9, r10, and r11, which are scratch.
+
+
+
+;;; Save registers that the compiler may be using, and adjust esp to
+;;; make room for our stack frame.
+
+
+;;; Retrieve the function arguments. r8d will hold cur_match
+;;; throughout the entire function. edx will hold the pointer to the
+;;; deflate_state structure during the function's setup (before
+;;; entering the main loop.
+
+; parameter 1 in rcx (deflate_state* s), param 2 in edx -> r8 (cur match)
+
+; this clear high 32 bits of r8, which can be garbage in both r8 and rdx
+
+
+        mov [save_rdi],rdi
+        mov [save_rsi],rsi
+        mov [save_rbx],rbx
+        mov [save_rbp],rbp
+        mov r8d,edx
+        mov [save_r12],r12
+        mov [save_r13],r13
+;        mov [save_r14],r14
+;        mov [save_r15],r15
+
+
+;;; uInt wmask = s->w_mask;
+;;; unsigned chain_length = s->max_chain_length;
+;;; if (s->prev_length >= s->good_match) {
+;;;     chain_length >>= 2;
+;;; }
+
+        mov edi, [rcx + dsPrevLen]
+        mov esi, [rcx + dsGoodMatch]
+        mov eax, [rcx + dsWMask]
+        mov ebx, [rcx + dsMaxChainLen]
+        cmp edi, esi
+        jl  LastMatchGood
+        shr ebx, 2
+LastMatchGood:
+
+;;; chainlen is decremented once beforehand so that the function can
+;;; use the sign flag instead of the zero flag for the exit test.
+;;; It is then shifted into the high word, to make room for the wmask
+;;; value, which it will always accompany.
+
+        dec ebx
+        shl ebx, 16
+        or  ebx, eax
+        mov [chainlenwmask], ebx
+
+;;; if ((uInt)nice_match > s->lookahead) nice_match = s->lookahead;
+
+        mov eax, [rcx + dsNiceMatch]
+        mov r10d, [rcx + dsLookahead]
+        cmp r10d, eax
+        cmovnl r10d, eax
+        mov [nicematch],r10d
+LookaheadLess:
+
+;;; register Bytef *scan = s->window + s->strstart;
+
+        mov r10, [rcx + dsWindow]
+        mov ebp, [rcx + dsStrStart]
+        lea r13, [r10 + rbp]
+
+;;; Determine how many bytes the scan ptr is off from being
+;;; dword-aligned.
+
+         mov r9,r13
+         neg r13
+         and r13,3
+
+;;; IPos limit = s->strstart > (IPos)MAX_DIST(s) ?
+;;;     s->strstart - (IPos)MAX_DIST(s) : NIL;
+
+        mov eax, [rcx + dsWSize]
+        sub eax, MIN_LOOKAHEAD
+        xor edi,edi
+        sub ebp, eax
+
+        mov r11d, [rcx + dsPrevLen]
+
+        cmovng ebp,edi
+
+;;; int best_len = s->prev_length;
+
+
+;;; Store the sum of s->window + best_len in esi locally, and in esi.
+
+       lea  rsi,[r10+r11]
+
+;;; register ush scan_start = *(ushf*)scan;
+;;; register ush scan_end   = *(ushf*)(scan+best_len-1);
+;;; Posf *prev = s->prev;
+
+        movzx r12d,word ptr [r9]
+        movzx   ebx, word ptr [r9 + r11 - 1]
+        mov rdi, [rcx + dsPrev]
+
+;;; Jump into the main loop.
+
+        mov edx, [chainlenwmask]
+
+        cmp bx,word ptr [rsi + r8 - 1]
+        jz  LookupLoopIsZero
+
+LookupLoop1:
+        and r8d, edx
+
+        movzx   r8d, word ptr [rdi + r8*2]
+        cmp r8d, ebp
+        jbe LeaveNow
+        sub edx, 00010000h
+        js  LeaveNow
+
+LoopEntry1:
+        cmp bx,word ptr [rsi + r8 - 1]
+        jz  LookupLoopIsZero
+
+LookupLoop2:
+        and r8d, edx
+
+        movzx   r8d, word ptr [rdi + r8*2]
+        cmp r8d, ebp
+        jbe LeaveNow
+        sub edx, 00010000h
+        js  LeaveNow
+
+LoopEntry2:
+        cmp bx,word ptr [rsi + r8 - 1]
+        jz  LookupLoopIsZero
+
+LookupLoop4:
+        and r8d, edx
+
+        movzx   r8d, word ptr [rdi + r8*2]
+        cmp r8d, ebp
+        jbe LeaveNow
+        sub edx, 00010000h
+        js  LeaveNow
+
+LoopEntry4:
+
+        cmp bx,word ptr [rsi + r8 - 1]
+        jnz LookupLoop1
+        jmp LookupLoopIsZero
+
+
+;;; do {
+;;;     match = s->window + cur_match;
+;;;     if (*(ushf*)(match+best_len-1) != scan_end ||
+;;;         *(ushf*)match != scan_start) continue;
+;;;     [...]
+;;; } while ((cur_match = prev[cur_match & wmask]) > limit
+;;;          && --chain_length != 0);
+;;;
+;;; Here is the inner loop of the function. The function will spend the
+;;; majority of its time in this loop, and majority of that time will
+;;; be spent in the first ten instructions.
+;;;
+;;; Within this loop:
+;;; ebx = scanend
+;;; r8d = curmatch
+;;; edx = chainlenwmask - i.e., ((chainlen << 16) | wmask)
+;;; esi = windowbestlen - i.e., (window + bestlen)
+;;; edi = prev
+;;; ebp = limit
+
+LookupLoop:
+        and r8d, edx
+
+        movzx   r8d, word ptr [rdi + r8*2]
+        cmp r8d, ebp
+        jbe LeaveNow
+        sub edx, 00010000h
+        js  LeaveNow
+
+LoopEntry:
+
+        cmp bx,word ptr [rsi + r8 - 1]
+        jnz LookupLoop1
+LookupLoopIsZero:
+        cmp     r12w, word ptr [r10 + r8]
+        jnz LookupLoop1
+
+
+;;; Store the current value of chainlen.
+        mov [chainlenwmask], edx
+
+;;; Point edi to the string under scrutiny, and esi to the string we
+;;; are hoping to match it up with. In actuality, esi and edi are
+;;; both pointed (MAX_MATCH_8 - scanalign) bytes ahead, and edx is
+;;; initialized to -(MAX_MATCH_8 - scanalign).
+
+        lea rsi,[r8+r10]
+        mov rdx, 0fffffffffffffef8h; -(MAX_MATCH_8)
+        lea rsi, [rsi + r13 + 0108h] ;MAX_MATCH_8]
+        lea rdi, [r9 + r13 + 0108h] ;MAX_MATCH_8]
+
+        prefetcht1 [rsi+rdx]
+        prefetcht1 [rdi+rdx]
+;;; Test the strings for equality, 8 bytes at a time. At the end,
+;;; adjust edx so that it is offset to the exact byte that mismatched.
+;;;
+;;; We already know at this point that the first three bytes of the
+;;; strings match each other, and they can be safely passed over before
+;;; starting the compare loop. So what this code does is skip over 0-3
+;;; bytes, as much as necessary in order to dword-align the edi
+;;; pointer. (esi will still be misaligned three times out of four.)
+;;;
+;;; It should be confessed that this loop usually does not represent
+;;; much of the total running time. Replacing it with a more
+;;; straightforward "rep cmpsb" would not drastically degrade
+;;; performance.
+
+;LoopCmps:
+;        mov eax, [rsi + rdx]
+;        xor eax, [rdi + rdx]
+;        jnz LeaveLoopCmps
+;        mov eax, [rsi + rdx + 4]
+;        xor eax, [rdi + rdx + 4]
+;        jnz LeaveLoopCmps4
+;        add rdx, 8
+;        jnz LoopCmps
+;        jmp LenMaximum
+;LeaveLoopCmps4: add rdx, 4
+;LeaveLoopCmps:  test    eax, 0000FFFFh
+;        jnz LenLower
+;        add rdx,  2
+;        shr eax, 16
+;LenLower:   sub al, 1
+;        adc rdx, 0
+
+
+LoopCmps:
+        mov rax, [rsi + rdx]
+        xor rax, [rdi + rdx]
+        jnz LeaveLoopCmps
+
+        mov rax, [rsi + rdx + 8]
+        xor rax, [rdi + rdx + 8]
+        jnz LeaveLoopCmps8
+
+
+        mov rax, [rsi + rdx + 8+8]
+        xor rax, [rdi + rdx + 8+8]
+        jnz LeaveLoopCmps16
+
+        add rdx,8+8+8
+
+        jmp short LoopCmps
+LeaveLoopCmps16: add rdx,8
+LeaveLoopCmps8: add rdx,8
+LeaveLoopCmps:
+
+        test    eax, 0000FFFFh
+        jnz LenLower
+
+        test eax,0ffffffffh
+
+        jnz LenLower32
+
+        add rdx,4
+        shr rax,32
+        or ax,ax
+        jnz LenLower
+
+LenLower32:
+        shr eax,16
+        add rdx,2
+LenLower:   sub al, 1
+        adc rdx, 0
+;;; Calculate the length of the match. If it is longer than MAX_MATCH,
+;;; then automatically accept it as the best possible match and leave.
+
+        lea rax, [rdi + rdx]
+        sub rax, r9
+        cmp eax, MAX_MATCH
+        jge LenMaximum
+
+;;; If the length of the match is not longer than the best match we
+;;; have so far, then forget it and return to the lookup loop.
+;///////////////////////////////////
+
+        cmp eax, r11d
+        jg  LongerMatch
+
+        lea rsi,[r10+r11]
+
+        mov rdi, [rcx + dsPrev]
+        mov edx, [chainlenwmask]
+        jmp LookupLoop
+
+;;;         s->match_start = cur_match;
+;;;         best_len = len;
+;;;         if (len >= nice_match) break;
+;;;         scan_end = *(ushf*)(scan+best_len-1);
+
+LongerMatch:
+        mov r11d, eax
+        mov [rcx + dsMatchStart], r8d
+        cmp eax, [nicematch]
+        jge LeaveNow
+
+        lea rsi,[r10+rax]
+
+        movzx   ebx, word ptr [r9 + rax - 1]
+        mov rdi, [rcx + dsPrev]
+        mov edx, [chainlenwmask]
+        jmp LookupLoop
+
+;;; Accept the current string, with the maximum possible length.
+
+LenMaximum:
+        mov r11d,MAX_MATCH
+        mov [rcx + dsMatchStart], r8d
+
+;;; if ((uInt)best_len <= s->lookahead) return (uInt)best_len;
+;;; return s->lookahead;
+
+LeaveNow:
+        mov eax, [rcx + dsLookahead]
+        cmp r11d, eax
+        cmovng eax, r11d
+
+
+;;; Restore the stack and return from whence we came.
+
+
+        mov rsi,[save_rsi]
+        mov rdi,[save_rdi]
+        mov rbx,[save_rbx]
+        mov rbp,[save_rbp]
+        mov r12,[save_r12]
+        mov r13,[save_r13]
+;        mov r14,[save_r14]
+;        mov r15,[save_r15]
+
+
+        ret 0
+; please don't remove this string !
+; Your can freely use gvmat32 in any free or commercial app if you don't remove the string in the binary!
+    db     0dh,0ah,"asm686 with masm, optimised assembly code from Brian Raiter, written 1998, converted to amd 64 by Gilles Vollant 2005",0dh,0ah,0
+longest_match   ENDP
+
+match_init PROC
+  ret 0
+match_init ENDP
+
+
+END

contrib/masmx64/inffas8664.c

@@ -0,0 +1,186 @@
+/* inffas8664.c is a hand tuned assembler version of inffast.c - fast decoding
+ * version for AMD64 on Windows using Microsoft C compiler
+ *
+ * Copyright (C) 1995-2003 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ *
+ * Copyright (C) 2003 Chris Anderson <christop@charm.net>
+ * Please use the copyright conditions above.
+ *
+ * 2005 - Adaptation to Microsoft C Compiler for AMD64 by Gilles Vollant
+ *
+ * inffas8664.c call function inffas8664fnc in inffasx64.asm
+ *  inffasx64.asm is automatically convert from AMD64 portion of inffas86.c
+ *
+ * Dec-29-2003 -- I added AMD64 inflate asm support.  This version is also
+ * slightly quicker on x86 systems because, instead of using rep movsb to copy
+ * data, it uses rep movsw, which moves data in 2-byte chunks instead of single
+ * bytes.  I've tested the AMD64 code on a Fedora Core 1 + the x86_64 updates
+ * from http://fedora.linux.duke.edu/fc1_x86_64
+ * which is running on an Athlon 64 3000+ / Gigabyte GA-K8VT800M system with
+ * 1GB ram.  The 64-bit version is about 4% faster than the 32-bit version,
+ * when decompressing mozilla-source-1.3.tar.gz.
+ *
+ * Mar-13-2003 -- Most of this is derived from inffast.S which is derived from
+ * the gcc -S output of zlib-1.2.0/inffast.c.  Zlib-1.2.0 is in beta release at
+ * the moment.  I have successfully compiled and tested this code with gcc2.96,
+ * gcc3.2, icc5.0, msvc6.0.  It is very close to the speed of inffast.S
+ * compiled with gcc -DNO_MMX, but inffast.S is still faster on the P3 with MMX
+ * enabled.  I will attempt to merge the MMX code into this version.  Newer
+ * versions of this and inffast.S can be found at
+ * http://www.eetbeetee.com/zlib/ and http://www.charm.net/~christop/zlib/
+ *
+ */
+
+#include <stdio.h>
+#include "zutil.h"
+#include "inftrees.h"
+#include "inflate.h"
+#include "inffast.h"
+
+/* Mark Adler's comments from inffast.c: */
+
+/*
+   Decode literal, length, and distance codes and write out the resulting
+   literal and match bytes until either not enough input or output is
+   available, an end-of-block is encountered, or a data error is encountered.
+   When large enough input and output buffers are supplied to inflate(), for
+   example, a 16K input buffer and a 64K output buffer, more than 95% of the
+   inflate execution time is spent in this routine.
+
+   Entry assumptions:
+
+        state->mode == LEN
+        strm->avail_in >= 6
+        strm->avail_out >= 258
+        start >= strm->avail_out
+        state->bits < 8
+
+   On return, state->mode is one of:
+
+        LEN -- ran out of enough output space or enough available input
+        TYPE -- reached end of block code, inflate() to interpret next block
+        BAD -- error in block data
+
+   Notes:
+
+    - The maximum input bits used by a length/distance pair is 15 bits for the
+      length code, 5 bits for the length extra, 15 bits for the distance code,
+      and 13 bits for the distance extra.  This totals 48 bits, or six bytes.
+      Therefore if strm->avail_in >= 6, then there is enough input to avoid
+      checking for available input while decoding.
+
+    - The maximum bytes that a single length/distance pair can output is 258
+      bytes, which is the maximum length that can be coded.  inflate_fast()
+      requires strm->avail_out >= 258 for each loop to avoid checking for
+      output space.
+ */
+
+
+
+    typedef struct inffast_ar {
+/* 64   32                               x86  x86_64 */
+/* ar offset                              register */
+/*  0    0 */ void *esp;                /* esp save */
+/*  8    4 */ void *ebp;                /* ebp save */
+/* 16    8 */ unsigned char FAR *in;    /* esi rsi  local strm->next_in */
+/* 24   12 */ unsigned char FAR *last;  /*     r9   while in < last */
+/* 32   16 */ unsigned char FAR *out;   /* edi rdi  local strm->next_out */
+/* 40   20 */ unsigned char FAR *beg;   /*          inflate()'s init next_out */
+/* 48   24 */ unsigned char FAR *end;   /*     r10  while out < end */
+/* 56   28 */ unsigned char FAR *window;/*          size of window, wsize!=0 */
+/* 64   32 */ code const FAR *lcode;    /* ebp rbp  local strm->lencode */
+/* 72   36 */ code const FAR *dcode;    /*     r11  local strm->distcode */
+/* 80   40 */ size_t /*unsigned long */hold;       /* edx rdx  local strm->hold */
+/* 88   44 */ unsigned bits;            /* ebx rbx  local strm->bits */
+/* 92   48 */ unsigned wsize;           /*          window size */
+/* 96   52 */ unsigned write;           /*          window write index */
+/*100   56 */ unsigned lmask;           /*     r12  mask for lcode */
+/*104   60 */ unsigned dmask;           /*     r13  mask for dcode */
+/*108   64 */ unsigned len;             /*     r14  match length */
+/*112   68 */ unsigned dist;            /*     r15  match distance */
+/*116   72 */ unsigned status;          /*          set when state chng*/
+    } type_ar;
+#ifdef ASMINF
+
+void inflate_fast(strm, start)
+z_streamp strm;
+unsigned start;         /* inflate()'s starting value for strm->avail_out */
+{
+    struct inflate_state FAR *state;
+    type_ar ar;
+    void inffas8664fnc(struct inffast_ar * par);
+
+    
+
+#if (defined( __GNUC__ ) && defined( __amd64__ ) && ! defined( __i386 )) || (defined(_MSC_VER) && defined(_M_AMD64))
+#define PAD_AVAIL_IN 6
+#define PAD_AVAIL_OUT 258    
+#else
+#define PAD_AVAIL_IN 5
+#define PAD_AVAIL_OUT 257
+#endif
+
+    /* copy state to local variables */
+    state = (struct inflate_state FAR *)strm->state;
+
+    ar.in = strm->next_in;
+    ar.last = ar.in + (strm->avail_in - PAD_AVAIL_IN);
+    ar.out = strm->next_out;
+    ar.beg = ar.out - (start - strm->avail_out);
+    ar.end = ar.out + (strm->avail_out - PAD_AVAIL_OUT);
+    ar.wsize = state->wsize;
+    ar.write = state->write;
+    ar.window = state->window;
+    ar.hold = state->hold;
+    ar.bits = state->bits;
+    ar.lcode = state->lencode;
+    ar.dcode = state->distcode;
+    ar.lmask = (1U << state->lenbits) - 1;
+    ar.dmask = (1U << state->distbits) - 1;
+
+    /* decode literals and length/distances until end-of-block or not enough
+       input data or output space */
+
+    /* align in on 1/2 hold size boundary */
+    while (((size_t)(void *)ar.in & (sizeof(ar.hold) / 2 - 1)) != 0) {
+        ar.hold += (unsigned long)*ar.in++ << ar.bits;
+        ar.bits += 8;
+    }
+
+    inffas8664fnc(&ar);
+
+    if (ar.status > 1) {
+        if (ar.status == 2)
+            strm->msg = "invalid literal/length code";
+        else if (ar.status == 3)
+            strm->msg = "invalid distance code";
+        else
+            strm->msg = "invalid distance too far back";
+        state->mode = BAD;
+    }
+    else if ( ar.status == 1 ) {
+        state->mode = TYPE;
+    }
+
+    /* return unused bytes (on entry, bits < 8, so in won't go too far back) */
+    ar.len = ar.bits >> 3;
+    ar.in -= ar.len;
+    ar.bits -= ar.len << 3;
+    ar.hold &= (1U << ar.bits) - 1;
+
+    /* update state and return */
+    strm->next_in = ar.in;
+    strm->next_out = ar.out;
+    strm->avail_in = (unsigned)(ar.in < ar.last ?
+                                PAD_AVAIL_IN + (ar.last - ar.in) :
+                                PAD_AVAIL_IN - (ar.in - ar.last));
+    strm->avail_out = (unsigned)(ar.out < ar.end ?
+                                 PAD_AVAIL_OUT + (ar.end - ar.out) :
+                                 PAD_AVAIL_OUT - (ar.out - ar.end));
+    state->hold = (unsigned long)ar.hold;
+    state->bits = ar.bits;
+    return;
+}
+
+#endif

contrib/masmx64/inffasx64.asm

@@ -0,0 +1,392 @@
+; inffasx64.asm is a hand tuned assembler version of inffast.c - fast decoding
+; version for AMD64 on Windows using Microsoft C compiler
+;
+; inffasx64.asm is automatically convert from AMD64 portion of inffas86.c
+; inffasx64.asm is called by inffas8664.c, which contain more info.
+
+
+; to compile this file, I use option
+;   ml64.exe /Flinffasx64 /c /Zi inffasx64.asm
+;   with Microsoft Macro Assembler (x64) for AMD64
+;
+;   ml64.exe is given with Visual Studio 2005, Windows 2003 server DDK
+;
+;   (you can get Windows 2003 server DDK with ml64 and cl.exe for AMD64 from 
+;      http://www.microsoft.com/whdc/devtools/ddk/default.mspx for low price)
+;
+
+.code
+inffas8664fnc PROC
+
+; see http://weblogs.asp.net/oldnewthing/archive/2004/01/14/58579.aspx and
+; http://msdn.microsoft.com/library/en-us/kmarch/hh/kmarch/64bitAMD_8e951dd2-ee77-4728-8702-55ce4b5dd24a.xml.asp
+;
+; All registers must be preserved across the call, except for
+;   rax, rcx, rdx, r8, r-9, r10, and r11, which are scratch.
+
+
+	mov [rsp-8],rsi
+	mov [rsp-16],rdi
+	mov [rsp-24],r12
+	mov [rsp-32],r13
+	mov [rsp-40],r14
+	mov [rsp-48],r15
+	mov [rsp-56],rbx
+
+	mov rax,rcx
+
+	mov	[rax+8], rbp       ; /* save regs rbp and rsp */
+	mov	[rax], rsp
+
+	mov	rsp, rax          ; /* make rsp point to &ar */
+
+	mov	rsi, [rsp+16]      ; /* rsi  = in */
+	mov	rdi, [rsp+32]      ; /* rdi  = out */
+	mov	r9, [rsp+24]       ; /* r9   = last */
+	mov	r10, [rsp+48]      ; /* r10  = end */
+	mov	rbp, [rsp+64]      ; /* rbp  = lcode */
+	mov	r11, [rsp+72]      ; /* r11  = dcode */
+	mov	rdx, [rsp+80]      ; /* rdx  = hold */
+	mov	ebx, [rsp+88]      ; /* ebx  = bits */
+	mov	r12d, [rsp+100]    ; /* r12d = lmask */
+	mov	r13d, [rsp+104]    ; /* r13d = dmask */
+                                          ; /* r14d = len */
+                                          ; /* r15d = dist */
+
+
+	cld
+	cmp	r10, rdi
+	je	L_one_time           ; /* if only one decode left */
+	cmp	r9, rsi
+
+    jne L_do_loop
+
+
+L_one_time:
+	mov	r8, r12           ; /* r8 = lmask */
+	cmp	bl, 32
+	ja	L_get_length_code_one_time
+
+	lodsd                         ; /* eax = *(uint *)in++ */
+	mov	cl, bl            ; /* cl = bits, needs it for shifting */
+	add	bl, 32             ; /* bits += 32 */
+	shl	rax, cl
+	or	rdx, rax          ; /* hold |= *((uint *)in)++ << bits */
+	jmp	L_get_length_code_one_time
+
+ALIGN 4
+L_while_test:
+	cmp	r10, rdi
+	jbe	L_break_loop
+	cmp	r9, rsi
+	jbe	L_break_loop
+
+L_do_loop:
+	mov	r8, r12           ; /* r8 = lmask */
+	cmp	bl, 32
+	ja	L_get_length_code    ; /* if (32 < bits) */
+
+	lodsd                         ; /* eax = *(uint *)in++ */
+	mov	cl, bl            ; /* cl = bits, needs it for shifting */
+	add	bl, 32             ; /* bits += 32 */
+	shl	rax, cl
+	or	rdx, rax          ; /* hold |= *((uint *)in)++ << bits */
+
+L_get_length_code:
+	and	r8, rdx            ; /* r8 &= hold */
+	mov	eax, [rbp+r8*4]  ; /* eax = lcode[hold & lmask] */
+
+	mov	cl, ah            ; /* cl = this.bits */
+	sub	bl, ah            ; /* bits -= this.bits */
+	shr	rdx, cl           ; /* hold >>= this.bits */
+
+	test	al, al
+	jnz	L_test_for_length_base ; /* if (op != 0) 45.7% */
+
+	mov	r8, r12            ; /* r8 = lmask */
+	shr	eax, 16            ; /* output this.val char */
+	stosb
+
+L_get_length_code_one_time:
+	and	r8, rdx            ; /* r8 &= hold */
+	mov	eax, [rbp+r8*4] ; /* eax = lcode[hold & lmask] */
+
+L_dolen:
+	mov	cl, ah            ; /* cl = this.bits */
+	sub	bl, ah            ; /* bits -= this.bits */
+	shr	rdx, cl           ; /* hold >>= this.bits */
+
+	test	al, al
+	jnz	L_test_for_length_base ; /* if (op != 0) 45.7% */
+
+	shr	eax, 16            ; /* output this.val char */
+	stosb
+	jmp	L_while_test
+
+ALIGN 4
+L_test_for_length_base:
+	mov	r14d, eax         ; /* len = this */
+	shr	r14d, 16           ; /* len = this.val */
+	mov	cl, al
+
+	test	al, 16
+	jz	L_test_for_second_level_length ; /* if ((op & 16) == 0) 8% */
+	and	cl, 15             ; /* op &= 15 */
+	jz	L_decode_distance    ; /* if (!op) */
+
+L_add_bits_to_len:
+	sub	bl, cl
+	xor	eax, eax
+	inc	eax
+	shl	eax, cl
+	dec	eax
+	and	eax, edx          ; /* eax &= hold */
+	shr	rdx, cl
+	add	r14d, eax         ; /* len += hold & mask[op] */
+
+L_decode_distance:
+	mov	r8, r13           ; /* r8 = dmask */
+	cmp	bl, 32
+	ja	L_get_distance_code  ; /* if (32 < bits) */
+
+	lodsd                         ; /* eax = *(uint *)in++ */
+	mov	cl, bl            ; /* cl = bits, needs it for shifting */
+	add	bl, 32             ; /* bits += 32 */
+	shl	rax, cl
+	or	rdx, rax          ; /* hold |= *((uint *)in)++ << bits */
+
+L_get_distance_code:
+	and	r8, rdx           ; /* r8 &= hold */
+	mov	eax, [r11+r8*4] ; /* eax = dcode[hold & dmask] */
+
+L_dodist:
+	mov	r15d, eax         ; /* dist = this */
+	shr	r15d, 16           ; /* dist = this.val */
+	mov	cl, ah
+	sub	bl, ah            ; /* bits -= this.bits */
+	shr	rdx, cl           ; /* hold >>= this.bits */
+	mov	cl, al            ; /* cl = this.op */
+
+	test	al, 16             ; /* if ((op & 16) == 0) */
+	jz	L_test_for_second_level_dist
+	and	cl, 15             ; /* op &= 15 */
+	jz	L_check_dist_one
+
+L_add_bits_to_dist:
+	sub	bl, cl
+	xor	eax, eax
+	inc	eax
+	shl	eax, cl
+	dec	eax                 ; /* (1 << op) - 1 */
+	and	eax, edx          ; /* eax &= hold */
+	shr	rdx, cl
+	add	r15d, eax         ; /* dist += hold & ((1 << op) - 1) */
+
+L_check_window:
+	mov	r8, rsi           ; /* save in so from can use it's reg */
+	mov	rax, rdi
+	sub	rax, [rsp+40]      ; /* nbytes = out - beg */
+
+	cmp	eax, r15d
+	jb	L_clip_window        ; /* if (dist > nbytes) 4.2% */
+
+	mov	ecx, r14d         ; /* ecx = len */
+	mov	rsi, rdi
+	sub	rsi, r15          ; /* from = out - dist */
+
+	sar	ecx, 1
+	jnc	L_copy_two           ; /* if len % 2 == 0 */
+
+	rep     movsw
+	mov	al, [rsi]
+	mov	[rdi], al
+	inc	rdi
+
+	mov	rsi, r8           ; /* move in back to %rsi, toss from */
+	jmp	L_while_test
+
+L_copy_two:
+	rep     movsw
+	mov	rsi, r8           ; /* move in back to %rsi, toss from */
+	jmp	L_while_test
+
+ALIGN 4
+L_check_dist_one:
+	cmp	r15d, 1            ; /* if dist 1, is a memset */
+	jne	L_check_window
+	cmp	[rsp+40], rdi      ; /* if out == beg, outside window */
+	je	L_check_window
+
+	mov	ecx, r14d         ; /* ecx = len */
+	mov	al, [rdi-1]
+	mov	ah, al
+
+	sar	ecx, 1
+	jnc	L_set_two
+	mov	[rdi], al
+	inc	rdi
+
+L_set_two:
+	rep     stosw
+	jmp	L_while_test
+
+ALIGN 4
+L_test_for_second_level_length:
+	test	al, 64
+	jnz	L_test_for_end_of_block ; /* if ((op & 64) != 0) */
+
+	xor	eax, eax
+	inc	eax
+	shl	eax, cl
+	dec	eax
+	and	eax, edx         ; /* eax &= hold */
+	add	eax, r14d        ; /* eax += len */
+	mov	eax, [rbp+rax*4] ; /* eax = lcode[val+(hold&mask[op])]*/
+	jmp	L_dolen
+
+ALIGN 4
+L_test_for_second_level_dist:
+	test	al, 64
+	jnz	L_invalid_distance_code ; /* if ((op & 64) != 0) */
+
+	xor	eax, eax
+	inc	eax
+	shl	eax, cl
+	dec	eax
+	and	eax, edx         ; /* eax &= hold */
+	add	eax, r15d        ; /* eax += dist */
+	mov	eax, [r11+rax*4] ; /* eax = dcode[val+(hold&mask[op])]*/
+	jmp	L_dodist
+
+ALIGN 4
+L_clip_window:
+	mov	ecx, eax         ; /* ecx = nbytes */
+	mov	eax, [rsp+92]     ; /* eax = wsize, prepare for dist cmp */
+	neg	ecx                ; /* nbytes = -nbytes */
+
+	cmp	eax, r15d
+	jb	L_invalid_distance_too_far ; /* if (dist > wsize) */
+
+	add	ecx, r15d         ; /* nbytes = dist - nbytes */
+	cmp	dword ptr [rsp+96], 0
+	jne	L_wrap_around_window ; /* if (write != 0) */
+
+	mov	rsi, [rsp+56]     ; /* from  = window */
+	sub	eax, ecx         ; /* eax  -= nbytes */
+	add	rsi, rax         ; /* from += wsize - nbytes */
+
+	mov	eax, r14d        ; /* eax = len */
+	cmp	r14d, ecx
+	jbe	L_do_copy           ; /* if (nbytes >= len) */
+
+	sub	eax, ecx         ; /* eax -= nbytes */
+	rep     movsb
+	mov	rsi, rdi
+	sub	rsi, r15         ; /* from = &out[ -dist ] */
+	jmp	L_do_copy
+
+ALIGN 4
+L_wrap_around_window:
+	mov	eax, [rsp+96]     ; /* eax = write */
+	cmp	ecx, eax
+	jbe	L_contiguous_in_window ; /* if (write >= nbytes) */
+
+	mov	esi, [rsp+92]     ; /* from  = wsize */
+	add	rsi, [rsp+56]     ; /* from += window */
+	add	rsi, rax         ; /* from += write */
+	sub	rsi, rcx         ; /* from -= nbytes */
+	sub	ecx, eax         ; /* nbytes -= write */
+
+	mov	eax, r14d        ; /* eax = len */
+	cmp	eax, ecx
+	jbe	L_do_copy           ; /* if (nbytes >= len) */
+
+	sub	eax, ecx         ; /* len -= nbytes */
+	rep     movsb
+	mov	rsi, [rsp+56]     ; /* from = window */
+	mov	ecx, [rsp+96]     ; /* nbytes = write */
+	cmp	eax, ecx
+	jbe	L_do_copy           ; /* if (nbytes >= len) */
+
+	sub	eax, ecx         ; /* len -= nbytes */
+	rep     movsb
+	mov	rsi, rdi
+	sub	rsi, r15         ; /* from = out - dist */
+	jmp	L_do_copy
+
+ALIGN 4
+L_contiguous_in_window:
+	mov	rsi, [rsp+56]     ; /* rsi = window */
+	add	rsi, rax
+	sub	rsi, rcx         ; /* from += write - nbytes */
+
+	mov	eax, r14d        ; /* eax = len */
+	cmp	eax, ecx
+	jbe	L_do_copy           ; /* if (nbytes >= len) */
+
+	sub	eax, ecx         ; /* len -= nbytes */
+	rep     movsb
+	mov	rsi, rdi
+	sub	rsi, r15         ; /* from = out - dist */
+	jmp	L_do_copy           ; /* if (nbytes >= len) */
+
+ALIGN 4
+L_do_copy:
+	mov	ecx, eax         ; /* ecx = len */
+	rep     movsb
+
+	mov	rsi, r8          ; /* move in back to %esi, toss from */
+	jmp	L_while_test
+
+L_test_for_end_of_block:
+	test	al, 32
+	jz	L_invalid_literal_length_code
+	mov	dword ptr [rsp+116], 1
+	jmp	L_break_loop_with_status
+
+L_invalid_literal_length_code:
+	mov	dword ptr [rsp+116], 2
+	jmp	L_break_loop_with_status
+
+L_invalid_distance_code:
+	mov	dword ptr [rsp+116], 3
+	jmp	L_break_loop_with_status
+
+L_invalid_distance_too_far:
+	mov	dword ptr [rsp+116], 4
+	jmp	L_break_loop_with_status
+
+L_break_loop:
+	mov	dword ptr [rsp+116], 0
+
+L_break_loop_with_status:
+; /* put in, out, bits, and hold back into ar and pop esp */
+	mov	[rsp+16], rsi     ; /* in */
+	mov	[rsp+32], rdi     ; /* out */
+	mov	[rsp+88], ebx     ; /* bits */
+	mov	[rsp+80], rdx     ; /* hold */
+
+	mov	rax, [rsp]       ; /* restore rbp and rsp */
+	mov	rbp, [rsp+8]
+	mov	rsp, rax
+
+
+
+	mov rsi,[rsp-8]
+	mov rdi,[rsp-16]
+	mov r12,[rsp-24]
+	mov r13,[rsp-32]
+	mov r14,[rsp-40]
+	mov r15,[rsp-48]
+	mov rbx,[rsp-56]
+	
+    ret 0
+;          :
+;          : "m" (ar)
+;          : "memory", "%rax", "%rbx", "%rcx", "%rdx", "%rsi", "%rdi",
+;            "%r8", "%r9", "%r10", "%r11", "%r12", "%r13", "%r14", "%r15"
+;    );
+
+inffas8664fnc 	ENDP
+;_TEXT	ENDS
+END

contrib/masmx64/readme.txt

@@ -0,0 +1,28 @@
+Summary
+-------
+This directory contains ASM implementations of the functions
+longest_match() and inflate_fast(), for 64 bits x86 (both AMD64 and Intel EM64t),
+for use with Microsoft Macro Assembler (x64) for AMD64 and Microsoft C++ 64 bits.
+
+gvmat64.asm is written by Gilles Vollant (2005), by using Brian Raiter 686/32 bits
+   assembly optimized version from Jean-loup Gailly original longest_match function
+
+inffasx64.asm and inffas8664.c were written by Chris Anderson, by optimizing
+   original function from Mark Adler
+
+Use instructions
+----------------
+Copy these files into the zlib source directory.
+
+define ASMV and ASMINF in your project. Include inffas8664.c in your source tree,
+and inffasx64.obj and gvmat64.obj as object to link.
+
+
+Build instructions
+------------------
+run bld_64.bat with Microsoft Macro Assembler (x64) for AMD64 (ml64.exe)
+
+ml64.exe is given with Visual Studio 2005, Windows 2003 server DDK
+
+You can get Windows 2003 server DDK with ml64 and cl for AMD64 from 
+  http://www.microsoft.com/whdc/devtools/ddk/default.mspx for low price)

contrib/masmx86/bld_ml32.bat

@@ -0,0 +1,2 @@
+ml /coff /Zi /c /Flgvmat32.lst  gvmat32.asm 
+ml /coff /Zi /c /Flinffas32.lst inffas32.asm 

contrib/masmx86/gvmat32c.c

@@ -6,16 +6,12 @@
  *  longest_match execute standard C code is wmask != 0x7fff
  *     (assembly code is faster with a fixed wmask)
  *
+ * Read comment at beginning of gvmat32.asm for more information
  */
 
+#if defined(ASMV) && (!defined(NOOLDPENTIUMCODE))
 #include "deflate.h"
 
-#ifdef ASMV
-#define NIL 0
-
-#define UNALIGNED_OK
-
-
 /* if your C compiler don't add underline before function name,
         define ADD_UNDERLINE_ASMFUNC */
 #ifdef ADD_UNDERLINE_ASMFUNC
@@ -25,11 +21,6 @@
 #endif
 
 
-
-void match_init()
-{
-}
-
 unsigned long cpudetect32();
 
 uInt longest_match_c(
@@ -45,162 +36,27 @@ uInt longest_match_686(
     deflate_state *s,
     IPos cur_match);                             /* current match */
 
+
+static uInt iIsPPro=2;
+
+void match_init ()
+{
+    iIsPPro = (((cpudetect32()/0x100)&0xf)>=6) ? 1 : 0;
+}
+
 uInt longest_match(
     deflate_state *s,
     IPos cur_match)                             /* current match */
 {
-    static uInt iIsPPro=2;
-
-    if ((s->w_mask == 0x7fff) && (iIsPPro==0))
-        return longest_match_7fff(s,cur_match);
-
-    if (iIsPPro==1)
+    if (iIsPPro!=0)
         return longest_match_686(s,cur_match);
 
-    if (iIsPPro==2)
-        iIsPPro = (((cpudetect32()/0x100)&0xf)>=6) ? 1 : 0;
+    if (s->w_mask != 0x7fff)
+        return longest_match_686(s,cur_match);
 
-    return longest_match_c(s,cur_match);
+    /* now ((s->w_mask == 0x7fff) && (iIsPPro==0)) */
+        return longest_match_7fff(s,cur_match);
 }
 
 
-
-uInt longest_match_c(s, cur_match)
-    deflate_state *s;
-    IPos cur_match;                             /* current match */
-{
-    unsigned chain_length = s->max_chain_length;/* max hash chain length */
-    register Bytef *scan = s->window + s->strstart; /* current string */
-    register Bytef *match;                       /* matched string */
-    register int len;                           /* length of current match */
-    int best_len = s->prev_length;              /* best match length so far */
-    int nice_match = s->nice_match;             /* stop if match long enough */
-    IPos limit = s->strstart > (IPos)MAX_DIST(s) ?
-        s->strstart - (IPos)MAX_DIST(s) : NIL;
-    /* Stop when cur_match becomes <= limit. To simplify the code,
-     * we prevent matches with the string of window index 0.
-     */
-    Posf *prev = s->prev;
-    uInt wmask = s->w_mask;
-
-#ifdef UNALIGNED_OK
-    /* Compare two bytes at a time. Note: this is not always beneficial.
-     * Try with and without -DUNALIGNED_OK to check.
-     */
-    register Bytef *strend = s->window + s->strstart + MAX_MATCH - 1;
-    register ush scan_start = *(ushf*)scan;
-    register ush scan_end   = *(ushf*)(scan+best_len-1);
-#else
-    register Bytef *strend = s->window + s->strstart + MAX_MATCH;
-    register Byte scan_end1  = scan[best_len-1];
-    register Byte scan_end   = scan[best_len];
-#endif
-
-    /* The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of 16.
-     * It is easy to get rid of this optimization if necessary.
-     */
-    Assert(s->hash_bits >= 8 && MAX_MATCH == 258, "Code too clever");
-
-    /* Do not waste too much time if we already have a good match: */
-    if (s->prev_length >= s->good_match) {
-        chain_length >>= 2;
-    }
-    /* Do not look for matches beyond the end of the input. This is necessary
-     * to make deflate deterministic.
-     */
-    if ((uInt)nice_match > s->lookahead) nice_match = s->lookahead;
-
-    Assert((ulg)s->strstart <= s->window_size-MIN_LOOKAHEAD, "need lookahead");
-
-    do {
-        Assert(cur_match < s->strstart, "no future");
-        match = s->window + cur_match;
-
-        /* Skip to next match if the match length cannot increase
-         * or if the match length is less than 2:
-         */
-#if (defined(UNALIGNED_OK) && MAX_MATCH == 258)
-        /* This code assumes sizeof(unsigned short) == 2. Do not use
-         * UNALIGNED_OK if your compiler uses a different size.
-         */
-        if (*(ushf*)(match+best_len-1) != scan_end ||
-            *(ushf*)match != scan_start) continue;
-
-        /* It is not necessary to compare scan[2] and match[2] since they are
-         * always equal when the other bytes match, given that the hash keys
-         * are equal and that HASH_BITS >= 8. Compare 2 bytes at a time at
-         * strstart+3, +5, ... up to strstart+257. We check for insufficient
-         * lookahead only every 4th comparison; the 128th check will be made
-         * at strstart+257. If MAX_MATCH-2 is not a multiple of 8, it is
-         * necessary to put more guard bytes at the end of the window, or
-         * to check more often for insufficient lookahead.
-         */
-        Assert(scan[2] == match[2], "scan[2]?");
-        scan++, match++;
-        do {
-        } while (*(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
-                 *(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
-                 *(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
-                 *(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
-                 scan < strend);
-        /* The funny "do {}" generates better code on most compilers */
-
-        /* Here, scan <= window+strstart+257 */
-        Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan");
-        if (*scan == *match) scan++;
-
-        len = (MAX_MATCH - 1) - (int)(strend-scan);
-        scan = strend - (MAX_MATCH-1);
-
-#else /* UNALIGNED_OK */
-
-        if (match[best_len]   != scan_end  ||
-            match[best_len-1] != scan_end1 ||
-            *match            != *scan     ||
-            *++match          != scan[1])      continue;
-
-        /* The check at best_len-1 can be removed because it will be made
-         * again later. (This heuristic is not always a win.)
-         * It is not necessary to compare scan[2] and match[2] since they
-         * are always equal when the other bytes match, given that
-         * the hash keys are equal and that HASH_BITS >= 8.
-         */
-        scan += 2, match++;
-        Assert(*scan == *match, "match[2]?");
-
-        /* We check for insufficient lookahead only every 8th comparison;
-         * the 256th check will be made at strstart+258.
-         */
-        do {
-        } while (*++scan == *++match && *++scan == *++match &&
-                 *++scan == *++match && *++scan == *++match &&
-                 *++scan == *++match && *++scan == *++match &&
-                 *++scan == *++match && *++scan == *++match &&
-                 scan < strend);
-
-        Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan");
-
-        len = MAX_MATCH - (int)(strend - scan);
-        scan = strend - MAX_MATCH;
-
-#endif /* UNALIGNED_OK */
-
-        if (len > best_len) {
-            s->match_start = cur_match;
-            best_len = len;
-            if (len >= nice_match) break;
-#ifdef UNALIGNED_OK
-            scan_end = *(ushf*)(scan+best_len-1);
-#else
-            scan_end1  = scan[best_len-1];
-            scan_end   = scan[best_len];
-#endif
-        }
-    } while ((cur_match = prev[cur_match & wmask]) > limit
-             && --chain_length != 0);
-
-    if ((uInt)best_len <= s->lookahead) return (uInt)best_len;
-    return s->lookahead;
-}
-
-#endif /* ASMV */
+#endif /* defined(ASMV) && (!defined(NOOLDPENTIUMCODE)) */

contrib/masmx86/inffas32.asm

@@ -1,3 +1,57 @@
+;/* inffas32.asm is a hand tuned assembler version of inffast.c -- fast decoding
+; *
+; * inffas32.asm is derivated from inffas86.c, with translation of assembly code
+; *
+; * Copyright (C) 1995-2003 Mark Adler
+; * For conditions of distribution and use, see copyright notice in zlib.h
+; *
+; * Copyright (C) 2003 Chris Anderson <christop@charm.net>
+; * Please use the copyright conditions above.
+; *
+; * Mar-13-2003 -- Most of this is derived from inffast.S which is derived from
+; * the gcc -S output of zlib-1.2.0/inffast.c.  Zlib-1.2.0 is in beta release at
+; * the moment.  I have successfully compiled and tested this code with gcc2.96,
+; * gcc3.2, icc5.0, msvc6.0.  It is very close to the speed of inffast.S
+; * compiled with gcc -DNO_MMX, but inffast.S is still faster on the P3 with MMX
+; * enabled.  I will attempt to merge the MMX code into this version.  Newer
+; * versions of this and inffast.S can be found at
+; * http://www.eetbeetee.com/zlib/ and http://www.charm.net/~christop/zlib/
+; * 
+; * 2005 : modification by Gilles Vollant
+; */
+; For Visual C++ 4.x and higher and ML 6.x and higher
+;   ml.exe is in directory \MASM611C of Win95 DDK
+;   ml.exe is also distributed in http://www.masm32.com/masmdl.htm
+;    and in VC++2003 toolkit at http://msdn.microsoft.com/visualc/vctoolkit2003/
+;
+;
+;   compile with command line option
+;   ml  /coff /Zi /c /Flinffas32.lst inffas32.asm
+
+;   if you define NO_GZIP (see inflate.h), compile with
+;   ml  /coff /Zi /c /Flinffas32.lst /DNO_GUNZIP inffas32.asm
+
+
+; zlib122sup is 0 fort zlib 1.2.2.1 and lower
+; zlib122sup is 8 fort zlib 1.2.2.2 and more (with addition of dmax and head 
+;        in inflate_state in inflate.h)
+zlib1222sup      equ    8
+
+
+IFDEF GUNZIP
+  INFLATE_MODE_TYPE    equ 11
+  INFLATE_MODE_BAD     equ 26
+ELSE
+  IFNDEF NO_GUNZIP
+    INFLATE_MODE_TYPE    equ 11
+    INFLATE_MODE_BAD     equ 26
+  ELSE
+    INFLATE_MODE_TYPE    equ 3
+    INFLATE_MODE_BAD     equ 17
+  ENDIF
+ENDIF
+
+
 ; 75 "inffast.S"
 ;FILE "inffast.S"
 
@@ -84,17 +138,16 @@ dd	2147483647
 dd	4294967295
 
 
-
 mode_state	 equ	0	;/* state->mode	*/
-wsize_state	 equ	32	;/* state->wsize */
-write_state	 equ	(36+4)	;/* state->write */
-window_state	 equ	(40+4)	;/* state->window */
-hold_state	 equ	(44+4)	;/* state->hold	*/
-bits_state	 equ	(48+4)	;/* state->bits	*/
-lencode_state	 equ	(64+4)	;/* state->lencode */
-distcode_state	 equ	(68+4)	;/* state->distcode */
-lenbits_state	 equ	(72+4)	;/* state->lenbits */
-distbits_state	 equ	(76+4)	;/* state->distbits */
+wsize_state	 equ	(32+zlib1222sup)	;/* state->wsize */
+write_state	 equ	(36+4+zlib1222sup)	;/* state->write */
+window_state	 equ	(40+4+zlib1222sup)	;/* state->window */
+hold_state	 equ	(44+4+zlib1222sup)	;/* state->hold	*/
+bits_state	 equ	(48+4+zlib1222sup)	;/* state->bits	*/
+lencode_state	 equ	(64+4+zlib1222sup)	;/* state->lencode */
+distcode_state	 equ	(68+4+zlib1222sup)	;/* state->distcode */
+lenbits_state	 equ	(72+4+zlib1222sup)	;/* state->lenbits */
+distbits_state	 equ	(76+4+zlib1222sup)	;/* state->distbits */
 
 
 ;;SECTION .text
@@ -868,7 +921,7 @@ L_invalid_distance_code:
 
 
 	mov  ecx, invalid_distance_code_msg
-	mov  edx,26
+	mov  edx,INFLATE_MODE_BAD
 	jmp  L_update_stream_state
 
 L_test_for_end_of_block:
@@ -881,7 +934,7 @@ L_test_for_end_of_block:
 	jz  L_invalid_literal_length_code
 
 	mov  ecx,0
-	mov  edx,11
+	mov  edx,INFLATE_MODE_TYPE
 	jmp  L_update_stream_state
 
 L_invalid_literal_length_code:
@@ -891,7 +944,7 @@ L_invalid_literal_length_code:
 
 
 	mov  ecx, invalid_literal_length_code_msg
-	mov  edx,26
+	mov  edx,INFLATE_MODE_BAD
 	jmp  L_update_stream_state
 
 L_invalid_distance_too_far:
@@ -900,7 +953,7 @@ L_invalid_distance_too_far:
 
 	mov  esi, [esp+44]
 	mov  ecx, invalid_distance_too_far_msg
-	mov  edx,26
+	mov  edx,INFLATE_MODE_BAD
 	jmp  L_update_stream_state
 
 L_update_stream_state:
@@ -1026,8 +1079,5 @@ L_done:
 	pop  edi
 	ret
 
-
-
-
 _TEXT	ends
 end

contrib/minizip/ChangeLogUnzip

@@ -1,3 +1,7 @@
+Change in 1.01e (12 feb 05)
+- Fix in zipOpen2 for globalcomment (Rolf Kalbermatter)
+- Fix possible memory leak in unzip.c (Zoran Stevanovic)
+
 Change in 1.01b (20 may 04)
 - Integrate patch from Debian package (submited by Mark Brown)
 - Add tools mztools from Xavier Roche

contrib/minizip/crypt.h

@@ -1,9 +1,9 @@
 /* crypt.h -- base code for crypt/uncrypt ZIPfile
 
 
-   Version 1.01, May 8th, 2004
+   Version 1.01e, February 12th, 2005
 
-   Copyright (C) 1998-2004 Gilles Vollant
+   Copyright (C) 1998-2005 Gilles Vollant
 
    This code is a modified version of crypting code in Infozip distribution
 

contrib/minizip/ioapi.c

@@ -1,9 +1,9 @@
 /* ioapi.c -- IO base function header for compress/uncompress .zip
    files using zlib + zip or unzip API
 
-   Version 1.01, May 8th, 2004
+   Version 1.01e, February 12th, 2005
 
-   Copyright (C) 1998-2004 Gilles Vollant
+   Copyright (C) 1998-2005 Gilles Vollant
 */
 
 #include <stdio.h>

contrib/minizip/ioapi.h

@@ -1,9 +1,9 @@
 /* ioapi.h -- IO base function header for compress/uncompress .zip
    files using zlib + zip or unzip API
 
-   Version 1.01, May 8th, 2004
+   Version 1.01e, February 12th, 2005
 
-   Copyright (C) 1998-2004 Gilles Vollant
+   Copyright (C) 1998-2005 Gilles Vollant
 */
 
 #ifndef _ZLIBIOAPI_H

contrib/minizip/iowin32.c

@@ -2,9 +2,9 @@
    files using zlib + zip or unzip API
    This IO API version uses the Win32 API (for Microsoft Windows)
 
-   Version 1.01, May 8th, 2004
+   Version 1.01e, February 12th, 2005
 
-   Copyright (C) 1998-2004 Gilles Vollant
+   Copyright (C) 1998-2005 Gilles Vollant
 */
 
 #include <stdlib.h>

contrib/minizip/iowin32.h

@@ -2,9 +2,9 @@
    files using zlib + zip or unzip API
    This IO API version uses the Win32 API (for Microsoft Windows)
 
-   Version 1.01, May 8th, 2004
+   Version 1.01e, February 12th, 2005
 
-   Copyright (C) 1998-2004 Gilles Vollant
+   Copyright (C) 1998-2005 Gilles Vollant
 */
 
 #include <windows.h>

contrib/minizip/miniunz.c

@@ -1,8 +1,8 @@
 /*
    miniunz.c
-   Version 1.01b, May 30th, 2004
+   Version 1.01e, February 12th, 2005
 
-   Copyright (C) 1998-2004 Gilles Vollant
+   Copyright (C) 1998-2005 Gilles Vollant
 */
 
 

contrib/minizip/minizip.c

@@ -1,8 +1,8 @@
 /*
    minizip.c
-   Version 1.01b, May 30th, 2004
+   Version 1.01e, February 12th, 2005
 
-   Copyright (C) 1998-2004 Gilles Vollant
+   Copyright (C) 1998-2005 Gilles Vollant
 */
 
 #include <stdio.h>

contrib/minizip/mztools.c

@@ -248,7 +248,7 @@ uLong* bytesRecovered;
       if (fpOutCD != NULL) {
         int nRead;
         char buffer[8192];
-        while ( (nRead = fread(buffer, 1, sizeof(buffer), fpOutCD)) > 0) {
+        while ( (nRead = (int)fread(buffer, 1, sizeof(buffer), fpOutCD)) > 0) {
           if ((int)fwrite(buffer, 1, nRead, fpOut) != nRead) {
             err = Z_ERRNO;
             break;

contrib/minizip/unzip.c

@@ -1,7 +1,7 @@
 /* unzip.c -- IO for uncompress .zip files using zlib
-   Version 1.01d, September 22th, 2004
+   Version 1.01e, February 12th, 2005
 
-   Copyright (C) 1998-2004 Gilles Vollant
+   Copyright (C) 1998-2005 Gilles Vollant
 
    Read unzip.h for more info
 */
@@ -1137,7 +1137,10 @@ extern int ZEXPORT unzOpenCurrentFile3 (file, method, level, raw, password)
       if (err == Z_OK)
         pfile_in_zip_read_info->stream_initialised=1;
       else
+      {
+        TRYFREE(pfile_in_zip_read_info);
         return err;
+      }
         /* windowBits is passed < 0 to tell that there is no zlib header.
          * Note that in this case inflate *requires* an extra "dummy" byte
          * after the compressed stream in order to complete decompression and

contrib/minizip/unzip.h

@@ -1,11 +1,13 @@
 /* unzip.h -- IO for uncompress .zip files using zlib
-   Version 1.01, May 8th, 2004
+   Version 1.01e, February 12th, 2005
 
-   Copyright (C) 1998-2004 Gilles Vollant
+   Copyright (C) 1998-2005 Gilles Vollant
 
    This unzip package allow extract file from .ZIP file, compatible with PKZip 2.04g
      WinZip, InfoZip tools and compatible.
-   Encryption and multi volume ZipFile (span) are not supported.
+
+   Multi volume ZipFile (span) are not supported.
+   Encryption compatible with pkzip 2.04g only supported
    Old compressions used by old PKZip 1.x are not supported
 
 

contrib/minizip/zip.c

@@ -1,7 +1,10 @@
 /* zip.c -- IO on .zip files using zlib
-   Version 1.01, May 8th, 2004
+   Version 1.01e, February 12th, 2005
 
-   Copyright (C) 1998-2004 Gilles Vollant
+   27 Dec 2004 Rolf Kalbermatter
+   Modification to zipOpen2 to support globalComment retrieval.
+
+   Copyright (C) 1998-2005 Gilles Vollant
 
    Read zip.h for more info
 */
@@ -143,6 +146,9 @@ typedef struct
     uLong begin_pos;            /* position of the beginning of the zipfile */
     uLong add_position_when_writting_offset;
     uLong number_entry;
+#ifndef NO_ADDFILEINEXISTINGZIP
+    char *globalcomment;
+#endif
 } zip_internal;
 
 
@@ -532,6 +538,7 @@ extern zipFile ZEXPORT zipOpen2 (pathname, append, globalcomment, pzlib_filefunc
 
     /* now we add file in a zipfile */
 #    ifndef NO_ADDFILEINEXISTINGZIP
+    ziinit.globalcomment = NULL;
     if (append == APPEND_STATUS_ADDINZIP)
     {
         uLong byte_before_the_zipfile;/* byte before the zipfile, (>0 for sfx)*/
@@ -592,7 +599,7 @@ extern zipFile ZEXPORT zipOpen2 (pathname, append, globalcomment, pzlib_filefunc
         if (ziplocal_getLong(&ziinit.z_filefunc, ziinit.filestream,&offset_central_dir)!=ZIP_OK)
             err=ZIP_ERRNO;
 
-        /* zipfile comment length */
+        /* zipfile global comment length */
         if (ziplocal_getShort(&ziinit.z_filefunc, ziinit.filestream,&size_comment)!=ZIP_OK)
             err=ZIP_ERRNO;
 
@@ -606,9 +613,19 @@ extern zipFile ZEXPORT zipOpen2 (pathname, append, globalcomment, pzlib_filefunc
             return NULL;
         }
 
+        if (size_comment>0)
+        {
+            ziinit.globalcomment = ALLOC(size_comment+1);
+            if (ziinit.globalcomment)
+            {
+               size_comment = ZREAD(ziinit.z_filefunc, ziinit.filestream,ziinit.globalcomment,size_comment);
+               ziinit.globalcomment[size_comment]=0;
+            }
+        }
+
         byte_before_the_zipfile = central_pos -
                                 (offset_central_dir+size_central_dir);
-        ziinit.add_position_when_writting_offset = byte_before_the_zipfile ;
+        ziinit.add_position_when_writting_offset = byte_before_the_zipfile;
 
         {
             uLong size_central_dir_to_read = size_central_dir;
@@ -641,10 +658,18 @@ extern zipFile ZEXPORT zipOpen2 (pathname, append, globalcomment, pzlib_filefunc
                   offset_central_dir+byte_before_the_zipfile,ZLIB_FILEFUNC_SEEK_SET)!=0)
             err=ZIP_ERRNO;
     }
+
+    if (globalcomment)
+    {
+      *globalcomment = ziinit.globalcomment;
+    }
 #    endif /* !NO_ADDFILEINEXISTINGZIP*/
 
     if (err != ZIP_OK)
     {
+#    ifndef NO_ADDFILEINEXISTINGZIP
+        TRYFREE(ziinit.globalcomment);
+#    endif /* !NO_ADDFILEINEXISTINGZIP*/
         TRYFREE(zi);
         return NULL;
     }
@@ -1112,7 +1137,7 @@ extern int ZEXPORT zipClose (file, global_comment)
     zip_internal* zi;
     int err = 0;
     uLong size_centraldir = 0;
-    uLong centraldir_pos_inzip ;
+    uLong centraldir_pos_inzip;
     uInt size_global_comment;
     if (file == NULL)
         return ZIP_PARAMERROR;
@@ -1123,12 +1148,15 @@ extern int ZEXPORT zipClose (file, global_comment)
         err = zipCloseFileInZip (file);
     }
 
+#ifndef NO_ADDFILEINEXISTINGZIP
+    if (global_comment==NULL)
+        global_comment = zi->globalcomment;
+#endif
     if (global_comment==NULL)
         size_global_comment = 0;
     else
         size_global_comment = (uInt)strlen(global_comment);
 
-
     centraldir_pos_inzip = ZTELL(zi->z_filefunc,zi->filestream);
     if (err==ZIP_OK)
     {
@@ -1182,6 +1210,9 @@ extern int ZEXPORT zipClose (file, global_comment)
         if (err == ZIP_OK)
             err = ZIP_ERRNO;
 
+#ifndef NO_ADDFILEINEXISTINGZIP
+    TRYFREE(zi->globalcomment);
+#endif
     TRYFREE(zi);
 
     return err;

contrib/minizip/zip.h

@@ -1,11 +1,12 @@
 /* zip.h -- IO for compress .zip files using zlib
-   Version 1.01, May 8th, 2004
+   Version 1.01e, February 12th, 2005
 
-   Copyright (C) 1998-2004 Gilles Vollant
+   Copyright (C) 1998-2005 Gilles Vollant
 
    This unzip package allow creates .ZIP file, compatible with PKZip 2.04g
      WinZip, InfoZip tools and compatible.
-   Encryption and multi volume ZipFile (span) are not supported.
+   Multi volume ZipFile (span) are not supported.
+   Encryption compatible with pkzip 2.04g only supported
    Old compressions used by old PKZip 1.x are not supported
 
   For uncompress .zip file, look at unzip.h

contrib/testzlib/rdtsc64.asm

@@ -0,0 +1,18 @@
+; rdtsc64.asm
+;
+; unsigned _int64 myrdtsc();
+;
+; return the performance rdtsc value, on AMD64/Intel EM64T
+;
+; compile with :
+;    ml64.exe" /Flrdtsc64   /c /Zi rdtsc64.asm
+;
+.code
+myrdtsc PROC
+          rdtsc
+          shl rdx,32
+          or rax,rdx
+          ret
+myrdtsc ENDP
+
+END

contrib/testzlib/testzlib.c

@@ -4,6 +4,101 @@
 #include <windows.h>
 #include "zlib.h"
 
+
+void MyDoMinus64(LARGE_INTEGER *R,LARGE_INTEGER A,LARGE_INTEGER B)
+{
+    R->HighPart = A.HighPart - B.HighPart;
+    if (A.LowPart >= B.LowPart)
+        R->LowPart = A.LowPart - B.LowPart;
+    else
+    {
+        R->LowPart = A.LowPart - B.LowPart;
+        R->HighPart --;
+    }
+}
+
+#ifdef _AMD64_
+unsigned _int64 myrdtsc();
+void BeginCountRdtsc(LARGE_INTEGER * pbeginTime64)
+{
+ //   printf("rdtsc = %I64x\n",myrdtsc());
+   pbeginTime64->QuadPart=myrdtsc();
+}
+
+LARGE_INTEGER GetResRdtsc(LARGE_INTEGER beginTime64,BOOL fComputeTimeQueryPerf)
+{
+    LARGE_INTEGER LIres;
+    unsigned _int64 res=myrdtsc()-((unsigned _int64)(beginTime64.QuadPart));
+    LIres.QuadPart=res;
+   // printf("rdtsc = %I64x\n",myrdtsc());
+    return LIres;
+}
+#else
+void myGetRDTSC32(LARGE_INTEGER * pbeginTime64)
+{
+    DWORD dwEdx,dwEax;
+    _asm
+    {
+        rdtsc
+        mov dwEax,eax
+        mov dwEdx,edx
+    }
+    pbeginTime64->LowPart=dwEax;
+    pbeginTime64->HighPart=dwEdx;
+}
+
+void BeginCountRdtsc(LARGE_INTEGER * pbeginTime64)
+{
+    myGetRDTSC32(pbeginTime64);
+}
+
+LARGE_INTEGER GetResRdtsc(LARGE_INTEGER beginTime64,BOOL fComputeTimeQueryPerf)
+{
+    LARGE_INTEGER LIres,endTime64;
+    myGetRDTSC32(&endTime64);
+
+    LIres.LowPart=LIres.HighPart=0;
+    MyDoMinus64(&LIres,endTime64,beginTime64);
+    return LIres;
+}
+#endif
+
+
+void BeginCountPerfCounter(LARGE_INTEGER * pbeginTime64,BOOL fComputeTimeQueryPerf)
+{
+    if ((!fComputeTimeQueryPerf) || (!QueryPerformanceCounter(pbeginTime64)))
+    {
+        pbeginTime64->LowPart = GetTickCount();
+        pbeginTime64->HighPart = 0;
+    }
+}
+
+DWORD GetMsecSincePerfCounter(LARGE_INTEGER beginTime64,BOOL fComputeTimeQueryPerf)
+{
+    LARGE_INTEGER endTime64,ticksPerSecond,ticks;
+    DWORDLONG ticksShifted,tickSecShifted;
+    DWORD dwLog=16+0;
+    DWORD dwRet;
+    if ((!fComputeTimeQueryPerf) || (!QueryPerformanceCounter(&endTime64)))
+        dwRet = (GetTickCount() - beginTime64.LowPart)*1;
+    else
+    {
+        MyDoMinus64(&ticks,endTime64,beginTime64);
+        QueryPerformanceFrequency(&ticksPerSecond);
+
+    
+        {
+            ticksShifted = Int64ShrlMod32(*(DWORDLONG*)&ticks,dwLog);
+            tickSecShifted = Int64ShrlMod32(*(DWORDLONG*)&ticksPerSecond,dwLog);
+        
+        } 
+
+        dwRet = (DWORD)((((DWORD)ticksShifted)*1000)/(DWORD)(tickSecShifted));
+        dwRet *=1;
+    }
+    return dwRet;
+}
+
 int ReadFileMemory(const char* filename,long* plFileSize,void** pFilePtr)
 {
     FILE* stream;
@@ -43,7 +138,8 @@ int main(int argc, char *argv[])
     unsigned char* CprPtr;
     unsigned char* UncprPtr;
     long lSizeCpr,lSizeUncpr;
-    DWORD dwGetTick;
+    DWORD dwGetTick,dwMsecQP;
+    LARGE_INTEGER li_qp,li_rdtsc,dwResRdtsc;
 
     if (argc<=1)
     {
@@ -71,9 +167,10 @@ int main(int argc, char *argv[])
     lBufferSizeUncpr = lBufferSizeCpr;
 
     CprPtr=(unsigned char*)malloc(lBufferSizeCpr + BlockSizeCompress);
-    UncprPtr=(unsigned char*)malloc(lBufferSizeUncpr + BlockSizeUncompress);
 
+    BeginCountPerfCounter(&li_qp,TRUE);
     dwGetTick=GetTickCount();
+    BeginCountRdtsc(&li_rdtsc);
     {
         z_stream zcpr;
         int ret=Z_OK;
@@ -101,11 +198,20 @@ int main(int argc, char *argv[])
         lSizeCpr=zcpr.total_out;
         deflateEnd(&zcpr);
         dwGetTick=GetTickCount()-dwGetTick;
+        dwMsecQP=GetMsecSincePerfCounter(li_qp,TRUE);
+        dwResRdtsc=GetResRdtsc(li_rdtsc,TRUE);
         printf("total compress size = %u, in %u step\n",lSizeCpr,step);
-        printf("time = %u msec = %f sec\n\n",dwGetTick,dwGetTick/(double)1000.);
+        printf("time = %u msec = %f sec\n",dwGetTick,dwGetTick/(double)1000.);
+        printf("defcpr time QP = %u msec = %f sec\n",dwMsecQP,dwMsecQP/(double)1000.);
+        printf("defcpr result rdtsc = %I64x\n\n",dwResRdtsc.QuadPart);
     }
 
+    CprPtr=(unsigned char*)realloc(CprPtr,lSizeCpr);
+    UncprPtr=(unsigned char*)malloc(lBufferSizeUncpr + BlockSizeUncompress);
+
+    BeginCountPerfCounter(&li_qp,TRUE);
     dwGetTick=GetTickCount();
+    BeginCountRdtsc(&li_rdtsc);
     {
         z_stream zcpr;
         int ret=Z_OK;
@@ -133,8 +239,12 @@ int main(int argc, char *argv[])
         lSizeUncpr=zcpr.total_out;
         inflateEnd(&zcpr);
         dwGetTick=GetTickCount()-dwGetTick;
+        dwMsecQP=GetMsecSincePerfCounter(li_qp,TRUE);
+        dwResRdtsc=GetResRdtsc(li_rdtsc,TRUE);
         printf("total uncompress size = %u, in %u step\n",lSizeUncpr,step);
-        printf("time = %u msec = %f sec\n\n",dwGetTick,dwGetTick/(double)1000.);
+        printf("time = %u msec = %f sec\n",dwGetTick,dwGetTick/(double)1000.);
+        printf("uncpr  time QP = %u msec = %f sec\n",dwMsecQP,dwMsecQP/(double)1000.);
+        printf("uncpr  result rdtsc = %I64x\n\n",dwResRdtsc.QuadPart);
     }
 
     if (lSizeUncpr==lFileSize)
@@ -145,5 +255,4 @@ int main(int argc, char *argv[])
     }
 
     return 0;
-
 }

contrib/testzlib/testzlib.txt

@@ -0,0 +1,10 @@
+To build testzLib with Visual Studio 2005:
+
+copy to a directory file from :
+- root of zLib tree
+- contrib/testzlib
+- contrib/masmx86
+- contrib/masmx64
+- contrib/vstudio/vc7
+
+and open testzlib8.sln

contrib/testzlib/testzlib8.sln

@@ -0,0 +1,32 @@
+
+Microsoft Visual Studio Solution File, Format Version 9.00
+# Visual Studio 2005
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "testzlib8", "testzlib8.vcproj", "{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Win32 = Debug|Win32
+		Debug|Win64 (AMD64) = Debug|Win64 (AMD64)
+		Release|Win32 = Release|Win32
+		Release|Win64 (AMD64) = Release|Win64 (AMD64)
+		ReleaseAsm|Win32 = ReleaseAsm|Win32
+		ReleaseAsm|Win64 (AMD64) = ReleaseAsm|Win64 (AMD64)
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Debug|Win32.ActiveCfg = Debug|Win32
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Debug|Win32.Build.0 = Debug|Win32
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Debug|Win64 (AMD64).ActiveCfg = Debug|Win64 (AMD64)
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Debug|Win64 (AMD64).Build.0 = Debug|Win64 (AMD64)
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Release|Win32.ActiveCfg = Release|Win32
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Release|Win32.Build.0 = Release|Win32
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Release|Win64 (AMD64).ActiveCfg = Release|Win64 (AMD64)
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Release|Win64 (AMD64).Build.0 = Release|Win64 (AMD64)
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.ReleaseAsm|Win32.ActiveCfg = ReleaseAsm|Win32
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.ReleaseAsm|Win32.Build.0 = ReleaseAsm|Win32
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.ReleaseAsm|Win64 (AMD64).ActiveCfg = ReleaseAsm|Win64 (AMD64)
+		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.ReleaseAsm|Win64 (AMD64).Build.0 = ReleaseAsm|Win64 (AMD64)
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal

contrib/testzlib/testzlib8.vcproj

@@ -0,0 +1,638 @@
+<?xml version="1.0" encoding="Windows-1252"?>
+<VisualStudioProject
+	ProjectType="Visual C++"
+	Version="8,00"
+	Name="testzlib8"
+	ProjectGUID="{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}"
+	Keyword="Win32Proj"
+	>
+	<Platforms>
+		<Platform
+			Name="Win32"
+		/>
+		<Platform
+			Name="Win64 (AMD64)"
+		/>
+	</Platforms>
+	<ToolFiles>
+		<DefaultToolFile
+			FileName="masm.tool"
+		/>
+	</ToolFiles>
+	<Configurations>
+		<Configuration
+			Name="Debug|Win32"
+			OutputDirectory="x86\$(ConfigurationName)"
+			IntermediateDirectory="x86\$(ConfigurationName)"
+			ConfigurationType="1"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="MASM"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				PreprocessorDefinitions="ASMV;ASMINF;WIN32;ZLIB_WINAPI;_DEBUG;_CONSOLE;_CRT_SECURE_NO_DEPRECATE"
+				MinimalRebuild="TRUE"
+				BasicRuntimeChecks="3"
+				RuntimeLibrary="1"
+				UsePrecompiledHeader="0"
+				AssemblerOutput="4"
+				WarningLevel="3"
+				Detect64BitPortabilityProblems="TRUE"
+				DebugInformationFormat="4"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalDependencies="gvmat32.obj inffas32.obj"
+				OutputFile="$(OutDir)/testzlib.exe"
+				LinkIncremental="2"
+				GenerateDebugInformation="TRUE"
+				ProgramDatabaseFile="$(OutDir)/testzlib.pdb"
+				SubSystem="1"
+				TargetMachine="1"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCWebDeploymentTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Debug|Win64 (AMD64)"
+			OutputDirectory="amd64\$(ConfigurationName)"
+			IntermediateDirectory="amd64\$(ConfigurationName)"
+			ConfigurationType="1"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="MASM"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				TargetEnvironment="3"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				PreprocessorDefinitions="ASMV;ASMINF;WIN32;ZLIB_WINAPI;_DEBUG;_CONSOLE;_CRT_SECURE_NO_DEPRECATE"
+				MinimalRebuild="TRUE"
+				BasicRuntimeChecks="3"
+				RuntimeLibrary="1"
+				UsePrecompiledHeader="0"
+				AssemblerOutput="4"
+				WarningLevel="3"
+				Detect64BitPortabilityProblems="TRUE"
+				DebugInformationFormat="3"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+				CommandLine=""
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalDependencies="gvmat64.obj inffasx64.obj rdtsc64.obj"
+				OutputFile="$(OutDir)/testzlib.exe"
+				LinkIncremental="2"
+				GenerateDebugInformation="TRUE"
+				ProgramDatabaseFile="$(OutDir)/testzlib.pdb"
+				SubSystem="1"
+				TargetMachine="17"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCWebDeploymentTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Release|Win32"
+			OutputDirectory="x86\$(ConfigurationName)"
+			IntermediateDirectory="x86\$(ConfigurationName)"
+			ConfigurationType="1"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="MASM"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="2"
+				InlineFunctionExpansion="1"
+				OmitFramePointers="TRUE"
+				PreprocessorDefinitions="WIN32;ZLIB_WINAPI;NDEBUG;_CONSOLE;_CRT_SECURE_NO_DEPRECATE"
+				StringPooling="TRUE"
+				RuntimeLibrary="0"
+				EnableFunctionLevelLinking="TRUE"
+				UsePrecompiledHeader="0"
+				WarningLevel="3"
+				Detect64BitPortabilityProblems="TRUE"
+				DebugInformationFormat="3"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)/testzlib.exe"
+				LinkIncremental="1"
+				GenerateDebugInformation="TRUE"
+				SubSystem="1"
+				OptimizeReferences="2"
+				EnableCOMDATFolding="2"
+				OptimizeForWindows98="1"
+				TargetMachine="1"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCWebDeploymentTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Release|Win64 (AMD64)"
+			OutputDirectory="amd64\$(ConfigurationName)"
+			IntermediateDirectory="amd64\$(ConfigurationName)"
+			ConfigurationType="1"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="MASM"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				TargetEnvironment="3"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="2"
+				InlineFunctionExpansion="1"
+				OmitFramePointers="TRUE"
+				PreprocessorDefinitions="WIN32;ZLIB_WINAPI;NDEBUG;_CONSOLE;_CRT_SECURE_NO_DEPRECATE"
+				StringPooling="TRUE"
+				RuntimeLibrary="0"
+				EnableFunctionLevelLinking="TRUE"
+				UsePrecompiledHeader="0"
+				WarningLevel="3"
+				Detect64BitPortabilityProblems="TRUE"
+				DebugInformationFormat="3"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalDependencies="rdtsc64.obj"
+				OutputFile="$(OutDir)/testzlib.exe"
+				LinkIncremental="1"
+				GenerateDebugInformation="TRUE"
+				SubSystem="1"
+				OptimizeReferences="2"
+				EnableCOMDATFolding="2"
+				OptimizeForWindows98="1"
+				TargetMachine="17"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCWebDeploymentTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="ReleaseAsm|Win32"
+			OutputDirectory="x86\$(ConfigurationName)"
+			IntermediateDirectory="x86\$(ConfigurationName)"
+			ConfigurationType="1"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="MASM"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="2"
+				InlineFunctionExpansion="1"
+				OmitFramePointers="TRUE"
+				PreprocessorDefinitions="ASMV;ASMINF;WIN32;ZLIB_WINAPI;NDEBUG;_CONSOLE;_CRT_SECURE_NO_DEPRECATE"
+				StringPooling="TRUE"
+				RuntimeLibrary="0"
+				EnableFunctionLevelLinking="TRUE"
+				UsePrecompiledHeader="0"
+				WarningLevel="3"
+				Detect64BitPortabilityProblems="TRUE"
+				DebugInformationFormat="3"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalDependencies="gvmat32.obj inffas32.obj"
+				OutputFile="$(OutDir)/testzlib.exe"
+				LinkIncremental="1"
+				GenerateDebugInformation="TRUE"
+				SubSystem="1"
+				OptimizeReferences="2"
+				EnableCOMDATFolding="2"
+				OptimizeForWindows98="1"
+				TargetMachine="1"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCWebDeploymentTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="ReleaseAsm|Win64 (AMD64)"
+			OutputDirectory="amd64\$(ConfigurationName)"
+			IntermediateDirectory="amd64\$(ConfigurationName)"
+			ConfigurationType="1"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+				CommandLine=""
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="MASM"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				TargetEnvironment="3"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="2"
+				InlineFunctionExpansion="1"
+				OmitFramePointers="TRUE"
+				PreprocessorDefinitions="ASMV;ASMINF;WIN32;ZLIB_WINAPI;NDEBUG;_CONSOLE;_CRT_SECURE_NO_DEPRECATE"
+				StringPooling="TRUE"
+				RuntimeLibrary="0"
+				EnableFunctionLevelLinking="TRUE"
+				UsePrecompiledHeader="0"
+				AssemblerOutput="4"
+				WarningLevel="3"
+				Detect64BitPortabilityProblems="TRUE"
+				DebugInformationFormat="3"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+				CommandLine=""
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalDependencies="gvmat64.obj inffasx64.obj rdtsc64.obj"
+				OutputFile="$(OutDir)/testzlib.exe"
+				LinkIncremental="1"
+				GenerateDebugInformation="TRUE"
+				SubSystem="1"
+				OptimizeReferences="2"
+				EnableCOMDATFolding="2"
+				OptimizeForWindows98="1"
+				TargetMachine="17"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCWebDeploymentTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+	</Configurations>
+	<References>
+	</References>
+	<Files>
+		<Filter
+			Name="Source Files"
+			Filter="cpp;c;cxx;def;odl;idl;hpj;bat;asm"
+			>
+			<File
+				RelativePath=".\adler32.c"
+				>
+			</File>
+			<File
+				RelativePath=".\compress.c"
+				>
+			</File>
+			<File
+				RelativePath=".\crc32.c"
+				>
+			</File>
+			<File
+				RelativePath=".\deflate.c"
+				>
+			</File>
+			<File
+				RelativePath=".\gvmat32c.c"
+				>
+				<FileConfiguration
+					Name="Debug|Win64 (AMD64)"
+					ExcludedFromBuild="TRUE"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+					/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="Release|Win64 (AMD64)"
+					ExcludedFromBuild="TRUE"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+					/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="ReleaseAsm|Win32"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+					/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="ReleaseAsm|Win64 (AMD64)"
+					ExcludedFromBuild="TRUE"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+					/>
+				</FileConfiguration>
+			</File>
+			<File
+				RelativePath=".\infback.c"
+				>
+			</File>
+			<File
+				RelativePath=".\inffas8664.c"
+				>
+				<FileConfiguration
+					Name="Debug|Win32"
+					ExcludedFromBuild="TRUE"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+					/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="Release|Win32"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+					/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="ReleaseAsm|Win32"
+					ExcludedFromBuild="TRUE"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+					/>
+				</FileConfiguration>
+			</File>
+			<File
+				RelativePath=".\inffast.c"
+				>
+			</File>
+			<File
+				RelativePath=".\inflate.c"
+				>
+			</File>
+			<File
+				RelativePath=".\inftrees.c"
+				>
+			</File>
+			<File
+				RelativePath="testzlib.c"
+				>
+			</File>
+			<File
+				RelativePath=".\trees.c"
+				>
+			</File>
+			<File
+				RelativePath=".\uncompr.c"
+				>
+			</File>
+			<File
+				RelativePath=".\zutil.c"
+				>
+			</File>
+		</Filter>
+		<Filter
+			Name="Header Files"
+			Filter="h;hpp;hxx;hm;inl;inc"
+			>
+		</Filter>
+		<Filter
+			Name="Resource Files"
+			Filter="rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe"
+			>
+		</Filter>
+	</Files>
+	<Globals>
+	</Globals>
+</VisualStudioProject>

contrib/vstudio/readme.txt

@@ -1,4 +1,4 @@
-Building instructions for the DLL versions of Zlib 1.21
+Building instructions for the DLL versions of Zlib 1.2.x
 =======================================================
 
 This directory contains projects that build zlib and minizip using

contrib/vstudio/vc7/zlib.rc

@@ -2,8 +2,8 @@
 
 #define IDR_VERSION1  1
 IDR_VERSION1	VERSIONINFO	MOVEABLE IMPURE LOADONCALL DISCARDABLE
-  FILEVERSION	 1,2,2
-  PRODUCTVERSION 1,2,2
+  FILEVERSION	 1,2,2,3
+  PRODUCTVERSION 1,2,2,3
   FILEFLAGSMASK	VS_FFI_FILEFLAGSMASK
   FILEFLAGS	0
   FILEOS	VOS_DOS_WINDOWS32
@@ -17,7 +17,7 @@ BEGIN
 
     BEGIN
       VALUE "FileDescription", "zlib data compression library\0"
-      VALUE "FileVersion",	"1.2.2\0"
+      VALUE "FileVersion",	"1.2.2.3\0"
       VALUE "InternalName",	"zlib\0"
       VALUE "OriginalFilename",	"zlib.dll\0"
       VALUE "ProductName",	"ZLib.DLL\0"

crc32.c

@@ -1,12 +1,12 @@
 /* crc32.c -- compute the CRC-32 of a data stream
- * Copyright (C) 1995-2003 Mark Adler
+ * Copyright (C) 1995-2005 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h
  *
  * Thanks to Rodney Brown <rbrown64@csc.com.au> for his contribution of faster
  * CRC methods: exclusive-oring 32 bits of data at a time, and pre-computing
  * tables for updating the shift register in one step with three exclusive-ors
- * instead of four steps with four exclusive-ors.  This results about a factor
- * of two increase in speed on a Power PC G4 (PPC7455) using gcc -O3.
+ * instead of four steps with four exclusive-ors.  This results in about a
+ * factor of two increase in speed on a Power PC G4 (PPC7455) using gcc -O3.
  */
 
 /* @(#) $Id$ */
@@ -72,6 +72,9 @@ local void make_crc_table OF((void));
 #ifdef MAKECRCH
    local void write_table OF((FILE *, const unsigned long FAR *));
 #endif /* MAKECRCH */
+local unsigned long gf2_matrix_times OF((unsigned long *mat,
+                                         unsigned long vec));
+local void gf2_matrix_square OF((unsigned long *square, unsigned long *mat));
 
 /*
   Generate tables for a byte-wise 32-bit CRC calculation on the polynomial:
@@ -270,7 +273,7 @@ local unsigned long crc32_little(crc, buf, len)
         len--;
     }
 
-    buf4 = (const u4 FAR *)buf;
+    buf4 = (const u4 FAR *)(const void FAR *)buf;
     while (len >= 32) {
         DOLIT32;
         len -= 32;
@@ -310,7 +313,7 @@ local unsigned long crc32_big(crc, buf, len)
         len--;
     }
 
-    buf4 = (const u4 FAR *)buf;
+    buf4 = (const u4 FAR *)(const void FAR *)buf;
     buf4--;
     while (len >= 32) {
         DOBIG32;
@@ -331,3 +334,89 @@ local unsigned long crc32_big(crc, buf, len)
 }
 
 #endif /* BYFOUR */
+
+#define GF2_DIM 32      /* dimension of GF(2) vectors (length of CRC) */
+
+/* ========================================================================= */
+local unsigned long gf2_matrix_times(mat, vec)
+    unsigned long *mat;
+    unsigned long vec;
+{
+    unsigned long sum;
+
+    sum = 0;
+    while (vec) {
+        if (vec & 1)
+            sum ^= *mat;
+        vec >>= 1;
+        mat++;
+    }
+    return sum;
+}
+
+/* ========================================================================= */
+local void gf2_matrix_square(square, mat)
+    unsigned long *square;
+    unsigned long *mat;
+{
+    int n;
+
+    for (n = 0; n < GF2_DIM; n++)
+        square[n] = gf2_matrix_times(mat, mat[n]);
+}
+
+/* ========================================================================= */
+uLong ZEXPORT crc32_combine(crc1, crc2, len2)
+    uLong crc1;
+    uLong crc2;
+    z_off_t len2;
+{
+    int n;
+    unsigned long row;
+    unsigned long even[GF2_DIM];    /* even-power-of-two zeros operator */
+    unsigned long odd[GF2_DIM];     /* odd-power-of-two zeros operator */
+
+    /* degenerate case */
+    if (len2 == 0)
+        return crc1;
+
+    /* put operator for one zero bit in odd */
+    odd[0] = 0xedb88320L;           /* CRC-32 polynomial */
+    row = 1;
+    for (n = 1; n < GF2_DIM; n++) {
+        odd[n] = row;
+        row <<= 1;
+    }
+
+    /* put operator for two zero bits in even */
+    gf2_matrix_square(even, odd);
+
+    /* put operator for four zero bits in odd */
+    gf2_matrix_square(odd, even);
+
+    /* apply len2 zeros to crc1 (first square will put the operator for one
+       zero byte, eight zero bits, in even) */
+    do {
+        /* apply zeros operator for this bit of len2 */
+        gf2_matrix_square(even, odd);
+        if (len2 & 1)
+            crc1 = gf2_matrix_times(even, crc1);
+        len2 >>= 1;
+
+        /* if no more bits set, then done */
+        if (len2 == 0)
+            break;
+
+        /* another iteration of the loop with odd and even swapped */
+        gf2_matrix_square(odd, even);
+        if (len2 & 1)
+            crc1 = gf2_matrix_times(odd, crc1);
+        len2 >>= 1;
+
+        /* if no more bits set, then done */
+    } while (len2 != 0);
+
+    /* return combined crc */
+    crc1 ^= crc2;
+    return crc1;
+}

deflate.c

@@ -1,5 +1,5 @@
 /* deflate.c -- compress data using the deflation algorithm
- * Copyright (C) 1995-2004 Jean-loup Gailly.
+ * Copyright (C) 1995-2005 Jean-loup Gailly.
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
@@ -52,7 +52,7 @@
 #include "deflate.h"
 
 const char deflate_copyright[] =
-   " deflate 1.2.2 Copyright 1995-2004 Jean-loup Gailly ";
+   " deflate 1.2.2.3 Copyright 1995-2005 Jean-loup Gailly ";
 /*
   If you use the zlib library in a product, an acknowledgment is welcome
   in the documentation of your product. If for some reason you cannot
@@ -264,7 +264,7 @@ int ZEXPORT deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
 #endif
     if (memLevel < 1 || memLevel > MAX_MEM_LEVEL || method != Z_DEFLATED ||
         windowBits < 8 || windowBits > 15 || level < 0 || level > 9 ||
-        strategy < 0 || strategy > Z_RLE) {
+        strategy < 0 || strategy > Z_FIXED) {
         return Z_STREAM_ERROR;
     }
     if (windowBits == 8) windowBits = 9;  /* until 256-byte window bug fixed */
@@ -274,6 +274,7 @@ int ZEXPORT deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
     s->strm = strm;
 
     s->wrap = wrap;
+    s->gzhead = Z_NULL;
     s->w_bits = windowBits;
     s->w_size = 1 << s->w_bits;
     s->w_mask = s->w_size - 1;
@@ -333,9 +334,7 @@ int ZEXPORT deflateSetDictionary (strm, dictionary, dictLength)
     if (length < MIN_MATCH) return Z_OK;
     if (length > MAX_DIST(s)) {
         length = MAX_DIST(s);
-#ifndef USE_DICT_HEAD
         dictionary += dictLength - length; /* use the tail of the dictionary */
-#endif
     }
     zmemcpy(s->window, dictionary, length);
     s->strstart = length;
@@ -390,6 +389,17 @@ int ZEXPORT deflateReset (strm)
     return Z_OK;
 }
 
+/* ========================================================================= */
+int ZEXPORT deflateSetHeader (strm, head)
+    z_streamp strm;
+    gz_headerp head;
+{
+    if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
+    if (strm->state->wrap != 2) return Z_STREAM_ERROR;
+    strm->state->gzhead = head;
+    return Z_OK;
+}
+
 /* ========================================================================= */
 int ZEXPORT deflatePrime (strm, bits, value)
     z_streamp strm;
@@ -420,7 +430,7 @@ int ZEXPORT deflateParams(strm, level, strategy)
 #else
     if (level == Z_DEFAULT_COMPRESSION) level = 6;
 #endif
-    if (level < 0 || level > 9 || strategy < 0 || strategy > Z_RLE) {
+    if (level < 0 || level > 9 || strategy < 0 || strategy > Z_FIXED) {
         return Z_STREAM_ERROR;
     }
     func = configuration_table[s->level].func;
@@ -440,6 +450,25 @@ int ZEXPORT deflateParams(strm, level, strategy)
     return err;
 }
 
+/* ========================================================================= */
+int ZEXPORT deflateTune(strm, good_length, max_lazy, nice_length, max_chain)
+    z_streamp strm;
+    int good_length;
+    int max_lazy;
+    int nice_length;
+    int max_chain;
+{
+    deflate_state *s;
+
+    if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
+    s = strm->state;
+    s->good_match = good_length;
+    s->max_lazy_match = max_lazy;
+    s->nice_match = nice_length;
+    s->max_chain_length = max_chain;
+    return Z_OK;
+}
+
 /* =========================================================================
  * For the default windowBits of 15 and memLevel of 8, this function returns
  * a close to exact, as well as small, upper bound on the compressed size.
@@ -548,20 +577,47 @@ int ZEXPORT deflate (strm, flush)
     if (s->status == INIT_STATE) {
 #ifdef GZIP
         if (s->wrap == 2) {
+            strm->adler = crc32(0L, Z_NULL, 0);
             put_byte(s, 31);
             put_byte(s, 139);
             put_byte(s, 8);
-            put_byte(s, 0);
-            put_byte(s, 0);
-            put_byte(s, 0);
-            put_byte(s, 0);
-            put_byte(s, 0);
-            put_byte(s, s->level == 9 ? 2 :
-                        (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2 ?
-                         4 : 0));
-            put_byte(s, 255);
-            s->status = BUSY_STATE;
-            strm->adler = crc32(0L, Z_NULL, 0);
+            if (s->gzhead == NULL) {
+                put_byte(s, 0);
+                put_byte(s, 0);
+                put_byte(s, 0);
+                put_byte(s, 0);
+                put_byte(s, 0);
+                put_byte(s, s->level == 9 ? 2 :
+                            (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2 ?
+                             4 : 0));
+                put_byte(s, OS_CODE);
+                s->status = BUSY_STATE;
+            }
+            else {
+                put_byte(s, (s->gzhead->text ? 1 : 0) +
+                            (s->gzhead->hcrc ? 2 : 0) +
+                            (s->gzhead->extra == Z_NULL ? 0 : 4) +
+                            (s->gzhead->name == Z_NULL ? 0 : 8) +
+                            (s->gzhead->comment == Z_NULL ? 0 : 16)
+                        );
+                put_byte(s, s->gzhead->time & 0xff);
+                put_byte(s, (s->gzhead->time >> 8) & 0xff);
+                put_byte(s, (s->gzhead->time >> 16) & 0xff);
+                put_byte(s, (s->gzhead->time >> 24) & 0xff);
+                put_byte(s, s->level == 9 ? 2 :
+                            (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2 ?
+                             4 : 0));
+                put_byte(s, s->gzhead->os & 0xff);
+                if (s->gzhead->extra != NULL) {
+                    put_byte(s, s->gzhead->extra_len & 0xff);
+                    put_byte(s, (s->gzhead->extra_len >> 8) & 0xff);
+                }
+                if (s->gzhead->hcrc)
+                    strm->adler = crc32(strm->adler, s->pending_buf,
+                                        s->pending);
+                s->gzindex = 0;
+                s->status = EXTRA_STATE;
+            }
         }
         else
 #endif
@@ -592,6 +648,110 @@ int ZEXPORT deflate (strm, flush)
             strm->adler = adler32(0L, Z_NULL, 0);
         }
     }
+#ifdef GZIP
+    if (s->status == EXTRA_STATE) {
+        if (s->gzhead->extra != NULL) {
+            int beg = s->pending;   /* start of bytes to update crc */
+
+            while (s->gzindex < (s->gzhead->extra_len & 0xffff)) {
+                if (s->pending == s->pending_buf_size) {
+                    if (s->gzhead->hcrc && s->pending > beg)
+                        strm->adler = crc32(strm->adler, s->pending_buf + beg,
+                                            s->pending - beg);
+                    flush_pending(strm);
+                    beg = s->pending;
+                    if (s->pending == s->pending_buf_size)
+                        break;
+                }
+                put_byte(s, s->gzhead->extra[s->gzindex]);
+                s->gzindex++;
+            }
+            if (s->gzhead->hcrc && s->pending > beg)
+                strm->adler = crc32(strm->adler, s->pending_buf + beg,
+                                    s->pending - beg);
+            if (s->gzindex == s->gzhead->extra_len) {
+                s->gzindex = 0;
+                s->status = NAME_STATE;
+            }
+        }
+        else
+            s->status = NAME_STATE;
+    }
+    if (s->status == NAME_STATE) {
+        if (s->gzhead->name != NULL) {
+            int beg = s->pending;   /* start of bytes to update crc */
+            int val;
+
+            do {
+                if (s->pending == s->pending_buf_size) {
+                    if (s->gzhead->hcrc && s->pending > beg)
+                        strm->adler = crc32(strm->adler, s->pending_buf + beg,
+                                            s->pending - beg);
+                    flush_pending(strm);
+                    beg = s->pending;
+                    if (s->pending == s->pending_buf_size) {
+                        val = 1;
+                        break;
+                    }
+                }
+                val = s->gzhead->name[s->gzindex++];
+                put_byte(s, val);
+            } while (val != 0);
+            if (s->gzhead->hcrc && s->pending > beg)
+                strm->adler = crc32(strm->adler, s->pending_buf + beg,
+                                    s->pending - beg);
+            if (val == 0) {
+                s->gzindex = 0;
+                s->status = COMMENT_STATE;
+            }
+        }
+        else
+            s->status = COMMENT_STATE;
+    }
+    if (s->status == COMMENT_STATE) {
+        if (s->gzhead->comment != NULL) {
+            int beg = s->pending;   /* start of bytes to update crc */
+            int val;
+
+            do {
+                if (s->pending == s->pending_buf_size) {
+                    if (s->gzhead->hcrc && s->pending > beg)
+                        strm->adler = crc32(strm->adler, s->pending_buf + beg,
+                                            s->pending - beg);
+                    flush_pending(strm);
+                    beg = s->pending;
+                    if (s->pending == s->pending_buf_size) {
+                        val = 1;
+                        break;
+                    }
+                }
+                val = s->gzhead->comment[s->gzindex++];
+                put_byte(s, val);
+            } while (val != 0);
+            if (s->gzhead->hcrc && s->pending > beg)
+                strm->adler = crc32(strm->adler, s->pending_buf + beg,
+                                    s->pending - beg);
+            if (val == 0)
+                s->status = HCRC_STATE;
+        }
+        else
+            s->status = HCRC_STATE;
+    }
+    if (s->status == HCRC_STATE) {
+        if (s->gzhead->hcrc) {
+            if (s->pending + 2 > s->pending_buf_size)
+                flush_pending(strm);
+            if (s->pending + 2 <= s->pending_buf_size) {
+                put_byte(s, strm->adler & 0xff);
+                put_byte(s, (strm->adler >> 8) & 0xff);
+                strm->adler = crc32(0L, Z_NULL, 0);
+                s->status = BUSY_STATE;
+            }
+        }
+        else
+            s->status = BUSY_STATE;
+    }
+#endif
 
     /* Flush as much pending output as possible */
     if (s->pending != 0) {
@@ -704,7 +864,12 @@ int ZEXPORT deflateEnd (strm)
     if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
 
     status = strm->state->status;
-    if (status != INIT_STATE && status != BUSY_STATE &&
+    if (status != INIT_STATE &&
+        status != EXTRA_STATE &&
+        status != NAME_STATE &&
+        status != COMMENT_STATE &&
+        status != HCRC_STATE &&
+        status != BUSY_STATE &&
         status != FINISH_STATE) {
       return Z_STREAM_ERROR;
     }
@@ -744,12 +909,12 @@ int ZEXPORT deflateCopy (dest, source)
 
     ss = source->state;
 
-    *dest = *source;
+    zmemcpy(dest, source, sizeof(z_stream));
 
     ds = (deflate_state *) ZALLOC(dest, 1, sizeof(deflate_state));
     if (ds == Z_NULL) return Z_MEM_ERROR;
     dest->state = (struct internal_state FAR *) ds;
-    *ds = *ss;
+    zmemcpy(ds, ss, sizeof(deflate_state));
     ds->strm = dest;
 
     ds->window = (Bytef *) ZALLOC(dest, ds->w_size, 2*sizeof(Byte));
@@ -838,9 +1003,11 @@ local void lm_init (s)
     s->match_length = s->prev_length = MIN_MATCH-1;
     s->match_available = 0;
     s->ins_h = 0;
+#ifndef FASTEST
 #ifdef ASMV
     match_init(); /* initialize the asm code */
 #endif
+#endif
 }
 
 #ifndef FASTEST
@@ -909,7 +1076,12 @@ local uInt longest_match(s, cur_match)
         match = s->window + cur_match;
 
         /* Skip to next match if the match length cannot increase
-         * or if the match length is less than 2:
+         * or if the match length is less than 2.  Note that the checks below
+         * for insufficient lookahead only occur occasionally for performance
+         * reasons.  Therefore uninitialized memory will be accessed, and
+         * conditional jumps will be made that depend on those values.
+         * However the length of the match is limited to the lookahead, so
+         * the output of deflate is not affected by the uninitialized values.
          */
 #if (defined(UNALIGNED_OK) && MAX_MATCH == 258)
         /* This code assumes sizeof(unsigned short) == 2. Do not use
@@ -1309,12 +1481,12 @@ local block_state deflate_fast(s, flush)
              * of the string with itself at the start of the input file).
              */
 #ifdef FASTEST
-            if ((s->strategy < Z_HUFFMAN_ONLY) ||
+            if ((s->strategy != Z_HUFFMAN_ONLY && s->strategy != Z_RLE) ||
                 (s->strategy == Z_RLE && s->strstart - hash_head == 1)) {
                 s->match_length = longest_match_fast (s, hash_head);
             }
 #else
-            if (s->strategy < Z_HUFFMAN_ONLY) {
+            if (s->strategy != Z_HUFFMAN_ONLY && s->strategy != Z_RLE) {
                 s->match_length = longest_match (s, hash_head);
             } else if (s->strategy == Z_RLE && s->strstart - hash_head == 1) {
                 s->match_length = longest_match_fast (s, hash_head);
@@ -1418,7 +1590,7 @@ local block_state deflate_slow(s, flush)
              * of window index 0 (in particular we have to avoid a match
              * of the string with itself at the start of the input file).
              */
-            if (s->strategy < Z_HUFFMAN_ONLY) {
+            if (s->strategy != Z_HUFFMAN_ONLY && s->strategy != Z_RLE) {
                 s->match_length = longest_match (s, hash_head);
             } else if (s->strategy == Z_RLE && s->strstart - hash_head == 1) {
                 s->match_length = longest_match_fast (s, hash_head);

deflate.h

@@ -1,5 +1,5 @@
 /* deflate.h -- internal compression state
- * Copyright (C) 1995-2002 Jean-loup Gailly
+ * Copyright (C) 1995-2004 Jean-loup Gailly
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
@@ -49,6 +49,10 @@
 /* All codes must not exceed MAX_BITS bits */
 
 #define INIT_STATE    42
+#define EXTRA_STATE   69
+#define NAME_STATE    73
+#define COMMENT_STATE 91
+#define HCRC_STATE   103
 #define BUSY_STATE   113
 #define FINISH_STATE 666
 /* Stream status */
@@ -95,6 +99,8 @@ typedef struct internal_state {
     Bytef *pending_out;  /* next pending byte to output to the stream */
     int   pending;       /* nb of bytes in the pending buffer */
     int   wrap;          /* bit 0 true for zlib, bit 1 true for gzip */
+    gz_headerp  gzhead;  /* gzip header information to write */
+    int   gzindex;       /* where in extra, name, or comment */
     Byte  method;        /* STORED (for zip only) or DEFLATED */
     int   last_flush;    /* value of flush param for previous deflate call */
 

example.c

@@ -1,5 +1,5 @@
 /* example.c -- usage example of the zlib compression library
- * Copyright (C) 1995-2003 Jean-loup Gailly.
+ * Copyright (C) 1995-2004 Jean-loup Gailly.
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
@@ -11,8 +11,6 @@
 #ifdef STDC
 #  include <string.h>
 #  include <stdlib.h>
-#else
-   extern void exit  OF((int));
 #endif
 
 #if defined(VMS) || defined(RISCOS)

examples/README.examples

@@ -0,0 +1,37 @@
+This directory contains examples of the use of zlib.
+
+fitblk.c
+    compress just enough input to nearly fill a requested output size
+    - zlib isn't designed to do this, but fitblk does it anyway
+
+gun.c
+    uncompress a gzip file
+    - illustrates the use of inflateBack() for high speed file-to-file
+      decompression using call-back functions
+    - is approximately twice as fast as gzip -d
+    - also provides Unix uncompress functionality, again twice as fast
+
+gzappend.c
+    append to a gzip file
+    - illustrates the use of the Z_BLOCK flush parameter for inflate()
+    - illustrates the use of deflatePrime() to start at any bit
+
+gzjoin.c
+    join gzip files without recalculating the crc or recompressing
+    - illustrates the use of the Z_BLOCK flush parameter for inflate()
+    - illustrates the use of crc32_combine()
+
+gzlog.c
+gzlog.h
+    efficiently maintain a message log file in gzip format
+    - illustrates use of raw deflate and Z_SYNC_FLUSH
+    - illustrates use of gzip header extra field
+
+zlib_how.html
+    painfully comprehensive description of zpipe.c (see below)
+    - describes in excruciating detail the use of deflate() and inflate()
+
+zpipe.c
+    reads and writes zlib streams from stdin to stdout
+    - illustrates the proper use of deflate() and inflate()
+    - deeply commented in zlib_how.html (see above)

examples/fitblk.c

@@ -0,0 +1,235 @@
+/* fitblk.c: example of fitting compressed output to a specified size
+   Not copyrighted -- provided to the public domain
+   Version 1.1  25 November 2004  Mark Adler */
+
+/* Version history:
+   1.0  24 Nov 2004  First version
+   1.1  25 Nov 2004  Change deflateInit2() to deflateInit()
+                     Use fixed-size, stack-allocated raw buffers
+                     Simplify code moving compression to subroutines
+                     Use assert() for internal errors
+                     Add detailed description of approach
+ */
+
+/* Approach to just fitting a requested compressed size:
+
+   fitblk performs three compression passes on a portion of the input
+   data in order to determine how much of that input will compress to
+   nearly the requested output block size.  The first pass generates
+   enough deflate blocks to produce output to fill the requested
+   output size plus a specfied excess amount (see the EXCESS define
+   below).  The last deflate block may go quite a bit past that, but
+   is discarded.  The second pass decompresses and recompresses just
+   the compressed data that fit in the requested plus excess sized
+   buffer.  The deflate process is terminated after that amount of
+   input, which is less than the amount consumed on the first pass.
+   The last deflate block of the result will be of a comparable size
+   to the final product, so that the header for that deflate block and
+   the compression ratio for that block will be about the same as in
+   the final product.  The third compression pass decompresses the
+   result of the second step, but only the compressed data up to the
+   requested size minus an amount to allow the compressed stream to
+   complete (see the MARGIN define below).  That will result in a
+   final compressed stream whose length is less than or equal to the
+   requested size.  Assuming sufficient input and a requested size
+   greater than a few hundred bytes, the shortfall will typically be
+   less than ten bytes.
+
+   If the input is short enough that the first compression completes
+   before filling the requested output size, then that compressed
+   stream is return with no recompression.
+
+   EXCESS is chosen to be just greater than the shortfall seen in a
+   two pass approach similar to the above.  That shortfall is due to
+   the last deflate block compressing more efficiently with a smaller
+   header on the second pass.  EXCESS is set to be large enough so
+   that there is enough uncompressed data for the second pass to fill
+   out the requested size, and small enough so that the final deflate
+   block of the second pass will be close in size to the final deflate
+   block of the third and final pass.  MARGIN is chosen to be just
+   large enough to assure that the final compression has enough room
+   to complete in all cases.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+#include "zlib.h"
+
+#define local static
+
+/* print nastygram and leave */
+local void quit(char *why)
+{
+    fprintf(stderr, "fitblk abort: %s\n", why);
+    exit(1);
+}
+
+#define RAWLEN 4096    /* intermediate uncompressed buffer size */
+
+/* compress from file to def until provided buffer is full or end of
+   input reached; return last deflate() return value, or Z_ERRNO if
+   there was read error on the file */
+local int partcompress(FILE *in, z_streamp def)
+{
+    int ret, flush;
+    char raw[RAWLEN];
+
+    flush = Z_NO_FLUSH;
+    do {
+        def->avail_in = fread(raw, 1, RAWLEN, in);
+        if (ferror(in))
+            return Z_ERRNO;
+        def->next_in = raw;
+        if (feof(in))
+            flush = Z_FINISH;
+        ret = deflate(def, flush);
+        assert(ret != Z_STREAM_ERROR);
+    } while (def->avail_out != 0 && flush == Z_NO_FLUSH);
+    return ret;
+}
+
+/* recompress from inf's input to def's output; the input for inf and
+   the output for def are set in those structures before calling;
+   return last deflate() return value, or Z_MEM_ERROR if inflate()
+   was not able to allocate enough memory when it needed to */
+local int recompress(z_streamp inf, z_streamp def)
+{
+    int ret, flush;
+    char raw[RAWLEN];
+
+    flush = Z_NO_FLUSH;
+    do {
+        /* decompress */
+        inf->avail_out = RAWLEN;
+        inf->next_out = raw;
+        ret = inflate(inf, Z_NO_FLUSH);
+        assert(ret != Z_STREAM_ERROR && ret != Z_DATA_ERROR &&
+               ret != Z_NEED_DICT);
+        if (ret == Z_MEM_ERROR)
+            return ret;
+
+        /* compress what was decompresed until done or no room */
+        def->avail_in = RAWLEN - inf->avail_out;
+        def->next_in = raw;
+        if (inf->avail_out != 0)
+            flush = Z_FINISH;
+        ret = deflate(def, flush);
+        assert(ret != Z_STREAM_ERROR);
+    } while (ret != Z_STREAM_END && def->avail_out != 0);
+    return ret;
+}
+
+#define EXCESS 256      /* empirically determined stream overage */
+#define MARGIN 8        /* amount to back off for completion */
+
+/* compress from stdin to fixed-size block on stdout */
+int main(int argc, char **argv)
+{
+    int ret;                /* return code */
+    unsigned size;          /* requested fixed output block size */
+    unsigned have;          /* bytes written by deflate() call */
+    char *blk;              /* intermediate and final stream */
+    char *tmp;              /* close to desired size stream */
+    z_stream def, inf;      /* zlib deflate and inflate states */
+
+    /* get requested output size */
+    if (argc != 2)
+        quit("need one argument: size of output block");
+    ret = strtol(argv[1], argv + 1, 10);
+    if (argv[1][0] != 0)
+        quit("argument must be a number");
+    if (ret < 8)            /* 8 is minimum zlib stream size */
+        quit("need positive size of 8 or greater");
+    size = (unsigned)ret;
+
+    /* allocate memory for buffers and compression engine */
+    blk = malloc(size + EXCESS);
+    def.zalloc = Z_NULL;
+    def.zfree = Z_NULL;
+    def.opaque = Z_NULL;
+    ret = deflateInit(&def, Z_DEFAULT_COMPRESSION);
+    if (ret != Z_OK || blk == NULL)
+        quit("out of memory");
+
+    /* compress from stdin until output full, or no more input */
+    def.avail_out = size + EXCESS;
+    def.next_out = blk;
+    ret = partcompress(stdin, &def);
+    if (ret == Z_ERRNO)
+        quit("error reading input");
+
+    /* if it all fit, then size was undersubscribed -- done! */
+    if (ret == Z_STREAM_END && def.avail_out >= EXCESS) {
+        /* write block to stdout */
+        have = size + EXCESS - def.avail_out;
+        ret = fwrite(blk, 1, have, stdout);
+        if (ret != have || ferror(stdout))
+            quit("error writing output");
+
+        /* clean up and print results to stderr */
+        ret = deflateEnd(&def);
+        assert(ret != Z_STREAM_ERROR);
+        free(blk);
+        fprintf(stderr,
+                "%u bytes unused out of %u requested (all input)\n",
+                size - have, size);
+        return 0;
+    }
+
+    /* it didn't all fit -- set up for recompression */
+    inf.zalloc = Z_NULL;
+    inf.zfree = Z_NULL;
+    inf.opaque = Z_NULL;
+    inf.avail_in = 0;
+    inf.next_in = Z_NULL;
+    ret = inflateInit(&inf);
+    tmp = malloc(size + EXCESS);
+    if (ret != Z_OK || tmp == NULL)
+        quit("out of memory");
+    ret = deflateReset(&def);
+    assert(ret != Z_STREAM_ERROR);
+
+    /* do first recompression close to the right amount */
+    inf.avail_in = size + EXCESS;
+    inf.next_in = blk;
+    def.avail_out = size + EXCESS;
+    def.next_out = tmp;
+    ret = recompress(&inf, &def);
+    if (ret == Z_MEM_ERROR)
+        quit("out of memory");
+
+    /* set up for next reocmpression */
+    ret = inflateReset(&inf);
+    assert(ret != Z_STREAM_ERROR);
+    ret = deflateReset(&def);
+    assert(ret != Z_STREAM_ERROR);
+
+    /* do second and final recompression (third compression) */
+    inf.avail_in = size - MARGIN;   /* assure stream will complete */
+    inf.next_in = tmp;
+    def.avail_out = size;
+    def.next_out = blk;
+    ret = recompress(&inf, &def);
+    if (ret == Z_MEM_ERROR)
+        quit("out of memory");
+    assert(ret == Z_STREAM_END);    /* otherwise MARGIN too small */
+
+    /* done -- write block to stdout */
+    have = size - def.avail_out;
+    ret = fwrite(blk, 1, have, stdout);
+    if (ret != have || ferror(stdout))
+        quit("error writing output");
+
+    /* clean up and print results to stderr */
+    free(tmp);
+    ret = inflateEnd(&inf);
+    assert(ret != Z_STREAM_ERROR);
+    ret = deflateEnd(&def);
+    assert(ret != Z_STREAM_ERROR);
+    free(blk);
+    fprintf(stderr,
+            "%u bytes unused out of %u requested (%lu input)\n",
+            size - have, size, def.total_in);
+    return 0;
+}

examples/gun.c

@@ -0,0 +1,692 @@
+/* gun.c -- simple gunzip to give an example of the use of inflateBack()
+ * Copyright (C) 2003, 2005 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+   Version 1.2  20 March 2005  Mark Adler */
+
+/* Version history:
+   1.0  16 Feb 2003  First version for testing of inflateBack()
+   1.1  21 Feb 2005  Decompress concatenated gzip streams
+                     Remove use of "this" variable (C++ keyword)
+                     Fix return value for in()
+                     Improve allocation failure checking
+                     Add typecasting for void * structures
+                     Add -h option for command version and usage
+                     Add a bunch of comments
+   1.2  20 Mar 2005  Add Unix compress (LZW) decompression
+                     Copy file attributes from input file to output file
+ */
+
+/*
+   gun [ -t ] [ name ... ]
+
+   decompresses the data in the named gzip files.  If no arguments are given,
+   gun will decompress from stdin to stdout.  The names must end in .gz, -gz,
+   .z, -z, _z, or .Z.  The uncompressed data will be written to a file name
+   with the suffix stripped.  On success, the original file is deleted.  On
+   failure, the output file is deleted.  For most failures, the command will
+   continue to process the remaining names on the command line.  A memory
+   allocation failure will abort the command.  If -t is specified, then the
+   listed files or stdin will be tested as gzip files for integrity (without
+   checking for a proper suffix), no output will be written, and no files
+   will be deleted.
+
+   Like gzip, gun allows concatenated gzip streams and will decompress them,
+   writing all of the uncompressed data to the output.  Unlike gzip, gun allows
+   an empty file on input, and will produce no error writing an empty output
+   file.
+
+   gun will also decompress files made by Unix compress, which uses LZW
+   compression.  These files are automatically detected by virtue of their
+   magic header bytes.  Since the end of Unix compress stream is marked by the
+   end-of-file, they cannot be concantenated.  If a Unix compress stream is
+   encountered in an input file, it is the last stream in that file.
+
+   Like gunzip and uncompress, the file attributes of the orignal compressed
+   file are maintained in the final uncompressed file, to the extent that the
+   user permissions allow it.
+
+   On my Mac OS X PowerPC G4, gun is almost twice as fast as gunzip (version
+   1.2.4) is on the same file, when gun is linked with zlib 1.2.2.  Also the
+   LZW decompression provided by gun is about twice as fast as the standard
+   Unix uncompress command.
+ */
+
+/* external functions and related types and constants */
+#include <stdio.h>          /* fprintf() */
+#include <stdlib.h>         /* malloc(), free() */
+#include <string.h>         /* strerror(), strcmp(), strlen(), memcpy() */
+#include <errno.h>          /* errno */
+#include <fcntl.h>          /* open() */
+#include <unistd.h>         /* read(), write(), close(), chown(), unlink() */
+#include <sys/types.h>
+#include <sys/stat.h>       /* stat(), chmod() */
+#include <utime.h>          /* utime() */
+#include "zlib.h"           /* inflateBackInit(), inflateBack(), */
+                            /* inflateBackEnd(), crc32() */
+
+/* function declaration */
+#define local static
+
+/* buffer constants */
+#define SIZE 32768U         /* input and output buffer sizes */
+#define PIECE 16384         /* limits i/o chunks for 16-bit int case */
+
+/* structure for infback() to pass to input function in() -- it maintains the
+   input file and a buffer of size SIZE */
+struct ind {
+    int infile;
+    unsigned char *inbuf;
+};
+
+/* Load input buffer, assumed to be empty, and return bytes loaded and a
+   pointer to them.  read() is called until the buffer is full, or until it
+   returns end-of-file or error.  Return 0 on error. */
+local unsigned in(void *in_desc, unsigned char **buf)
+{
+    int ret;
+    unsigned len;
+    unsigned char *next;
+    struct ind *me = (struct ind *)in_desc;
+
+    next = me->inbuf;
+    *buf = next;
+    len = 0;
+    do {
+        ret = PIECE;
+        if ((unsigned)ret > SIZE - len)
+            ret = (int)(SIZE - len);
+        ret = (int)read(me->infile, next, ret);
+        if (ret == -1) {
+            len = 0;
+            break;
+        }
+        next += ret;
+        len += ret;
+    } while (ret != 0 && len < SIZE);
+    return len;
+}
+
+/* structure for infback() to pass to output function out() -- it maintains the
+   output file, a running CRC-32 check on the output and the total number of
+   bytes output, both for checking against the gzip trailer.  (The length in
+   the gzip trailer is stored modulo 2^32, so it's ok if a long is 32 bits and
+   the output is greater than 4 GB.) */
+struct outd {
+    int outfile;
+    int check;                  /* true if checking crc and total */
+    unsigned long crc;
+    unsigned long total;
+};
+
+/* Write output buffer and update the CRC-32 and total bytes written.  write()
+   is called until all of the output is written or an error is encountered.
+   On success out() returns 0.  For a write failure, out() returns 1.  If the
+   output file descriptor is -1, then nothing is written.
+ */
+local int out(void *out_desc, unsigned char *buf, unsigned len)
+{
+    int ret;
+    struct outd *me = (struct outd *)out_desc;
+
+    if (me->check) {
+        me->crc = crc32(me->crc, buf, len);
+        me->total += len;
+    }
+    if (me->outfile != -1)
+        do {
+            ret = PIECE;
+            if ((unsigned)ret > len)
+                ret = (int)len;
+            ret = (int)write(me->outfile, buf, ret);
+            if (ret == -1)
+                return 1;
+            buf += ret;
+            len -= ret;
+        } while (len != 0);
+    return 0;
+}
+
+/* next input byte macro for use inside lunpipe() and gunpipe() */
+#define NEXT() (have ? 0 : (have = in(indp, &next)), \
+                last = have ? (have--, (int)(*next++)) : -1)
+
+/* memory for gunpipe() and lunpipe() --
+   the first 256 entries of prefix[] and suffix[] are never used, could
+   have offset the index, but it's faster to waste the memory */
+unsigned char inbuf[SIZE];              /* input buffer */
+unsigned char outbuf[SIZE];             /* output buffer */
+unsigned short prefix[65536];           /* index to LZW prefix string */
+unsigned char suffix[65536];            /* one-character LZW suffix */
+unsigned char match[65280 + 2];         /* buffer for reversed match or gzip
+                                           32K sliding window */
+
+/* throw out what's left in the current bits byte buffer (this is a vestigial
+   aspect of the compressed data format derived from an implementation that
+   made use of a special VAX machine instruction!) */
+#define FLUSHCODE() \
+    do { \
+        left = 0; \
+        rem = 0; \
+        if (chunk > have) { \
+            chunk -= have; \
+            have = 0; \
+            if (NEXT() == -1) \
+                break; \
+            chunk--; \
+            if (chunk > have) { \
+                chunk = have = 0; \
+                break; \
+            } \
+        } \
+        have -= chunk; \
+        next += chunk; \
+        chunk = 0; \
+    } while (0)
+
+/* Decompress a compress (LZW) file from indp to outfile.  The compress magic
+   header (two bytes) has already been read and verified.  There are have bytes
+   of buffered input at next.  strm is used for passing error information back
+   to gunpipe().
+
+   lunpipe() will return Z_OK on success, Z_BUF_ERROR for an unexpected end of
+   file, read error, or write error (a write error indicated by strm->next_in
+   not equal to Z_NULL), or Z_DATA_ERROR for invalid input.
+ */
+local int lunpipe(unsigned have, unsigned char *next, struct ind *indp,
+                  int outfile, z_stream *strm)
+{
+    int last;                   /* last byte read by NEXT(), or -1 if EOF */
+    int chunk;                  /* bytes left in current chunk */
+    int left;                   /* bits left in rem */
+    unsigned rem;               /* unused bits from input */
+    int bits;                   /* current bits per code */
+    unsigned code;              /* code, table traversal index */
+    unsigned mask;              /* mask for current bits codes */
+    int max;                    /* maximum bits per code for this stream */
+    int flags;                  /* compress flags, then block compress flag */
+    unsigned end;               /* last valid entry in prefix/suffix tables */
+    unsigned temp;              /* current code */
+    unsigned prev;              /* previous code */
+    unsigned final;             /* last character written for previous code */
+    unsigned stack;             /* next position for reversed string */
+    unsigned outcnt;            /* bytes in output buffer */
+    struct outd outd;           /* output structure */
+
+    /* set up output */
+    outd.outfile = outfile;
+    outd.check = 0;
+
+    /* process remainder of compress header -- a flags byte */
+    flags = NEXT();
+    if (last == -1)
+        return Z_BUF_ERROR;
+    if (flags & 0x60) {
+        strm->msg = "unknown lzw flags set";
+        return Z_DATA_ERROR;
+    }
+    max = flags & 0x1f;
+    if (max < 9 || max > 16) {
+        strm->msg = "lzw bits out of range";
+        return Z_DATA_ERROR;
+    }
+    if (max == 9)                           /* 9 doesn't really mean 9 */
+        max = 10;
+    flags &= 0x80;                          /* true if block compress */
+
+    /* clear table */
+    bits = 9;
+    mask = 0x1ff;
+    end = flags ? 256 : 255;
+
+    /* set up: get first 9-bit code, which is the first decompressed byte, but
+       don't create a table entry until the next code */
+    if (NEXT() == -1)                       /* no compressed data is ok */
+        return Z_OK;
+    final = prev = (unsigned)last;          /* low 8 bits of code */
+    if (NEXT() == -1)                       /* missing a bit */
+        return Z_BUF_ERROR;
+    if (last & 1) {                         /* code must be < 256 */
+        strm->msg = "invalid lzw code";
+        return Z_DATA_ERROR;
+    }
+    rem = (unsigned)last >> 1;              /* remaining 7 bits */
+    left = 7;
+    chunk = bits - 2;                       /* 7 bytes left in this chunk */
+    outbuf[0] = (unsigned char)final;       /* write first decompressed byte */
+    outcnt = 1;
+
+    /* decode codes */
+    stack = 0;
+    for (;;) {
+        /* if the table will be full after this, increment the code size */
+        if (end >= mask && bits < max) {
+            FLUSHCODE();
+            bits++;
+            mask <<= 1;
+            mask++;
+        }
+
+        /* get a code of length bits */
+        if (chunk == 0)                     /* decrement chunk modulo bits */
+            chunk = bits;
+        code = rem;                         /* low bits of code */
+        if (NEXT() == -1) {                 /* EOF is end of compressed data */
+            /* write remaining buffered output */
+            if (outcnt && out(&outd, outbuf, outcnt)) {
+                strm->next_in = outbuf;     /* signal write error */
+                return Z_BUF_ERROR;
+            }
+            return Z_OK;
+        }
+        code += (unsigned)last << left;     /* middle (or high) bits of code */
+        left += 8;
+        chunk--;
+        if (bits > left) {                  /* need more bits */
+            if (NEXT() == -1)               /* can't end in middle of code */
+                return Z_BUF_ERROR;
+            code += (unsigned)last << left; /* high bits of code */
+            left += 8;
+            chunk--;
+        }
+        code &= mask;                       /* mask to current code length */
+        left -= bits;                       /* number of unused bits */
+        rem = (unsigned)last >> (8 - left); /* unused bits from last byte */
+
+        /* process clear code (256) */
+        if (code == 256 && flags) {
+            FLUSHCODE();
+            bits = 9;                       /* initialize bits and mask */
+            mask = 0x1ff;
+            end = 255;                      /* empty table */
+            continue;                       /* get next code */
+        }
+
+        /* special code to reuse last match */
+        temp = code;                        /* save the current code */
+        if (code > end) {
+            /* Be picky on the allowed code here, and make sure that the code
+               we drop through (prev) will be a valid index so that random
+               input does not cause an exception.  The code != end + 1 check is
+               empirically derived, and not checked in the original uncompress
+               code.  If this ever causes a problem, that check could be safely
+               removed.  Leaving this check in greatly improves gun's ability
+               to detect random or corrupted input after a compress header.
+               In any case, the prev > end check must be retained. */
+            if (code != end + 1 || prev > end) {
+                strm->msg = "invalid lzw code";
+                return Z_DATA_ERROR;
+            }
+            match[stack++] = (unsigned char)final;
+            code = prev;
+        }
+
+        /* walk through linked list to generate output in reverse order */
+        while (code >= 256) {
+            match[stack++] = suffix[code];
+            code = prefix[code];
+        }
+        match[stack++] = (unsigned char)code;
+        final = code;
+
+        /* link new table entry */
+        if (end < mask) {
+            end++;
+            prefix[end] = (unsigned short)prev;
+            suffix[end] = (unsigned char)final;
+        }
+
+        /* set previous code for next iteration */
+        prev = temp;
+
+        /* write output in forward order */
+        while (stack > SIZE - outcnt) {
+            while (outcnt < SIZE)
+                outbuf[outcnt++] = match[--stack];
+            if (out(&outd, outbuf, outcnt)) {
+                strm->next_in = outbuf; /* signal write error */
+                return Z_BUF_ERROR;
+            }
+            outcnt = 0;
+        }
+        do {
+            outbuf[outcnt++] = match[--stack];
+        } while (stack);
+
+        /* loop for next code with final and prev as the last match, rem and
+           left provide the first 0..7 bits of the next code, end is the last
+           valid table entry */
+    }
+}
+
+/* Decompress a gzip file from infile to outfile.  strm is assumed to have been
+   successfully initialized with inflateBackInit().  The input file may consist
+   of a series of gzip streams, in which case all of them will be decompressed
+   to the output file.  If outfile is -1, then the gzip stream(s) integrity is
+   checked and nothing is written.
+
+   The return value is a zlib error code: Z_MEM_ERROR if out of memory,
+   Z_DATA_ERROR if the header or the compressed data is invalid, or if the
+   trailer CRC-32 check or length doesn't match, Z_BUF_ERROR if the input ends
+   prematurely or a write error occurs, or Z_ERRNO if junk (not a another gzip
+   stream) follows a valid gzip stream.
+ */
+local int gunpipe(z_stream *strm, int infile, int outfile)
+{
+    int ret, first, last;
+    unsigned have, flags, len;
+    unsigned char *next;
+    struct ind ind, *indp;
+    struct outd outd;
+
+    /* setup input buffer */
+    ind.infile = infile;
+    ind.inbuf = inbuf;
+    indp = &ind;
+
+    /* decompress concatenated gzip streams */
+    have = 0;                               /* no input data read in yet */
+    first = 1;                              /* looking for first gzip header */
+    strm->next_in = Z_NULL;                 /* so Z_BUF_ERROR means EOF */
+    for (;;) {
+        /* look for the two magic header bytes for a gzip stream */
+        if (NEXT() == -1) {
+            ret = Z_OK;
+            break;                          /* empty gzip stream is ok */
+        }
+        if (last != 31 || (NEXT() != 139 && last != 157)) {
+            strm->msg = "incorrect header check";
+            ret = first ? Z_DATA_ERROR : Z_ERRNO;
+            break;                          /* not a gzip or compress header */
+        }
+        first = 0;                          /* next non-header is junk */
+
+        /* process a compress (LZW) file -- can't be concatenated after this */
+        if (last == 157) {
+            ret = lunpipe(have, next, indp, outfile, strm);
+            break;
+        }
+
+        /* process remainder of gzip header */
+        ret = Z_BUF_ERROR;
+        if (NEXT() != 8) {                  /* only deflate method allowed */
+            if (last == -1) break;
+            strm->msg = "unknown compression method";
+            ret = Z_DATA_ERROR;
+            break;
+        }
+        flags = NEXT();                     /* header flags */
+        NEXT();                             /* discard mod time, xflgs, os */
+        NEXT();
+        NEXT();
+        NEXT();
+        NEXT();
+        NEXT();
+        if (last == -1) break;
+        if (flags & 0xe0) {
+            strm->msg = "unknown header flags set";
+            ret = Z_DATA_ERROR;
+            break;
+        }
+        if (flags & 4) {                    /* extra field */
+            len = NEXT();
+            len += (unsigned)(NEXT()) << 8;
+            if (last == -1) break;
+            while (len > have) {
+                len -= have;
+                have = 0;
+                if (NEXT() == -1) break;
+                len--;
+            }
+            if (last == -1) break;
+            have -= len;
+            next += len;
+        }
+        if (flags & 8)                      /* file name */
+            while (NEXT() != 0 && last != -1)
+                ;
+        if (flags & 16)                     /* comment */
+            while (NEXT() != 0 && last != -1)
+                ;
+        if (flags & 2) {                    /* header crc */
+            NEXT();
+            NEXT();
+        }
+        if (last == -1) break;
+
+        /* set up output */
+        outd.outfile = outfile;
+        outd.check = 1;
+        outd.crc = crc32(0L, Z_NULL, 0);
+        outd.total = 0;
+
+        /* decompress data to output */
+        strm->next_in = next;
+        strm->avail_in = have;
+        ret = inflateBack(strm, in, indp, out, &outd);
+        if (ret != Z_STREAM_END) break;
+        next = strm->next_in;
+        have = strm->avail_in;
+        strm->next_in = Z_NULL;             /* so Z_BUF_ERROR means EOF */
+
+        /* check trailer */
+        ret = Z_BUF_ERROR;
+        if (NEXT() != (outd.crc & 0xff) ||
+            NEXT() != ((outd.crc >> 8) & 0xff) ||
+            NEXT() != ((outd.crc >> 16) & 0xff) ||
+            NEXT() != ((outd.crc >> 24) & 0xff)) {
+            /* crc error */
+            if (last != -1) {
+                strm->msg = "incorrect data check";
+                ret = Z_DATA_ERROR;
+            }
+            break;
+        }
+        if (NEXT() != (outd.total & 0xff) ||
+            NEXT() != ((outd.total >> 8) & 0xff) ||
+            NEXT() != ((outd.total >> 16) & 0xff) ||
+            NEXT() != ((outd.total >> 24) & 0xff)) {
+            /* length error */
+            if (last != -1) {
+                strm->msg = "incorrect length check";
+                ret = Z_DATA_ERROR;
+            }
+            break;
+        }
+
+        /* go back and look for another gzip stream */
+    }
+
+    /* clean up and return */
+    return ret;
+}
+
+/* Copy file attributes, from -> to, as best we can.  This is best effort, so
+   no errors are reported.  The mode bits, including suid, sgid, and the sticky
+   bit are copied (if allowed), the owner's user id and group id are copied
+   (again if allowed), and the access and modify times are copied. */
+local void copymeta(char *from, char *to)
+{
+    struct stat was;
+    struct utimbuf when;
+
+    /* get all of from's Unix meta data, return if not a regular file */
+    if (stat(from, &was) != 0 || (was.st_mode & S_IFMT) != S_IFREG)
+        return;
+
+    /* set to's mode bits, ignore errors */
+    (void)chmod(to, was.st_mode & 07777);
+
+    /* copy owner's user and group, ignore errors */
+    (void)chown(to, was.st_uid, was.st_gid);
+
+    /* copy access and modify times, ignore errors */
+    when.actime = was.st_atime;
+    when.modtime = was.st_mtime;
+    (void)utime(to, &when);
+}
+
+/* Decompress the file inname to the file outnname, of if test is true, just
+   decompress without writing and check the gzip trailer for integrity.  If
+   inname is NULL or an empty string, read from stdin.  If outname is NULL or
+   an empty string, write to stdout.  strm is a pre-initialized inflateBack
+   structure.  When appropriate, copy the file attributes from inname to
+   outname.
+
+   gunzip() returns 1 if there is an out-of-memory error or an unexpected
+   return code from gunpipe().  Otherwise it returns 0.
+ */
+local int gunzip(z_stream *strm, char *inname, char *outname, int test)
+{
+    int ret;
+    int infile, outfile;
+
+    /* open files */
+    if (inname == NULL || *inname == 0) {
+        inname = "-";
+        infile = 0;     /* stdin */
+    }
+    else {
+        infile = open(inname, O_RDONLY, 0);
+        if (infile == -1) {
+            fprintf(stderr, "gun cannot open %s\n", inname);
+            return 0;
+        }
+    }
+    if (test)
+        outfile = -1;
+    else if (outname == NULL || *outname == 0) {
+        outname = "-";
+        outfile = 1;    /* stdout */
+    }
+    else {
+        outfile = open(outname, O_CREAT | O_TRUNC | O_WRONLY, 0666);
+        if (outfile == -1) {
+            close(infile);
+            fprintf(stderr, "gun cannot create %s\n", outname);
+            return 0;
+        }
+    }
+    errno = 0;
+
+    /* decompress */
+    ret = gunpipe(strm, infile, outfile);
+    if (outfile > 2) close(outfile);
+    if (infile > 2) close(infile);
+
+    /* interpret result */
+    switch (ret) {
+    case Z_OK:
+    case Z_ERRNO:
+        if (infile > 2 && outfile > 2) {
+            copymeta(inname, outname);          /* copy attributes */
+            unlink(inname);
+        }
+        if (ret == Z_ERRNO)
+            fprintf(stderr, "gun warning: trailing garbage ignored in %s\n",
+                    inname);
+        break;
+    case Z_DATA_ERROR:
+        if (outfile > 2) unlink(outname);
+        fprintf(stderr, "gun data error on %s: %s\n", inname, strm->msg);
+        break;
+    case Z_MEM_ERROR:
+        if (outfile > 2) unlink(outname);
+        fprintf(stderr, "gun out of memory error--aborting\n");
+        return 1;
+    case Z_BUF_ERROR:
+        if (outfile > 2) unlink(outname);
+        if (strm->next_in != Z_NULL) {
+            fprintf(stderr, "gun write error on %s: %s\n",
+                    outname, strerror(errno));
+        }
+        else if (errno) {
+            fprintf(stderr, "gun read error on %s: %s\n",
+                    inname, strerror(errno));
+        }
+        else {
+            fprintf(stderr, "gun unexpected end of file on %s\n",
+                    inname);
+        }
+        break;
+    default:
+        if (outfile > 2) unlink(outname);
+        fprintf(stderr, "gun internal error--aborting\n");
+        return 1;
+    }
+    return 0;
+}
+
+/* Process the gun command line arguments.  See the command syntax near the
+   beginning of this source file. */
+int main(int argc, char **argv)
+{
+    int ret, len, test;
+    char *outname;
+    unsigned char *window;
+    z_stream strm;
+
+    /* initialize inflateBack state for repeated use */
+    window = match;                         /* reuse LZW match buffer */
+    strm.zalloc = Z_NULL;
+    strm.zfree = Z_NULL;
+    strm.opaque = Z_NULL;
+    ret = inflateBackInit(&strm, 15, window);
+    if (ret != Z_OK) {
+        fprintf(stderr, "gun out of memory error--aborting\n");
+        return 1;
+    }
+
+    /* decompress each file to the same name with the suffix removed */
+    argc--;
+    argv++;
+    test = 0;
+    if (argc && strcmp(*argv, "-h") == 0) {
+        fprintf(stderr, "gun 1.2 (20 Mar 2005)\n");
+        fprintf(stderr, "Copyright (c) 2005 Mark Adler\n");
+        fprintf(stderr, "usage: gun [-t] [file1.gz [file2.Z ...]]\n");
+        return 0;
+    }
+    if (argc && strcmp(*argv, "-t") == 0) {
+        test = 1;
+        argc--;
+        argv++;
+    }
+    if (argc)
+        do {
+            if (test)
+                outname = NULL;
+            else {
+                len = (int)strlen(*argv);
+                if (strcmp(*argv + len - 3, ".gz") == 0 ||
+                    strcmp(*argv + len - 3, "-gz") == 0)
+                    len -= 3;
+                else if (strcmp(*argv + len - 2, ".z") == 0 ||
+                    strcmp(*argv + len - 2, "-z") == 0 ||
+                    strcmp(*argv + len - 2, "_z") == 0 ||
+                    strcmp(*argv + len - 2, ".Z") == 0)
+                    len -= 2;
+                else {
+                    fprintf(stderr, "gun error: no gz type on %s--skipping\n",
+                            *argv);
+                    continue;
+                }
+                outname = malloc(len + 1);
+                if (outname == NULL) {
+                    fprintf(stderr, "gun out of memory error--aborting\n");
+                    ret = 1;
+                    break;
+                }
+                memcpy(outname, *argv, len);
+                outname[len] = 0;
+            }
+            ret = gunzip(&strm, *argv, outname, test);
+            if (outname != NULL) free(outname);
+            if (ret) break;
+        } while (argv++, --argc);
+    else
+        ret = gunzip(&strm, NULL, NULL, test);
+
+    /* clean up */
+    inflateBackEnd(&strm);
+    return ret;
+}

examples/gzjoin.c

@@ -0,0 +1,447 @@
+/* gzjoin -- command to join gzip files into one gzip file
+
+  Copyright (C) 2004 Mark Adler, all rights reserved
+  version 1.0, 11 Dec 2004
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the author be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+
+  Mark Adler    madler@alumni.caltech.edu
+ */
+
+/*
+ * Change history:
+ *
+ * 1.0  11 Dec 2004     - First version
+ */
+
+/*
+   gzjoin takes one or more gzip files on the command line and writes out a
+   single gzip file that will uncompress to the concatenation of the
+   uncompressed data from the individual gzip files.  gzjoin does this without
+   having to recompress any of the data and without having to calculate a new
+   crc32 for the concatenated uncompressed data.  gzjoin does however have to
+   decompress all of the input data in order to find the bits in the compressed
+   data that need to be modified to concatenate the streams.
+
+   gzjoin does not do an integrity check on the input gzip files other than
+   checking the gzip header and decompressing the compressed data.  They are
+   otherwise assumed to be complete and correct.
+
+   Each joint between gzip files removes at least 18 bytes of previous trailer
+   and subsequent header, and inserts an average of about three bytes to the
+   compressed data in order to connect the streams.  The output gzip file
+   has a minimal ten-byte gzip header with no file name or modification time.
+
+   This program was written to illustrate the use of the Z_BLOCK option of
+   inflate() and the crc32_combine() function.  gzjoin will not compile with
+   versions of zlib earlier than 1.2.3.
+ */
+
+#include <stdio.h>      /* fputs(), fprintf(), fwrite(), putc() */
+#include <stdlib.h>     /* exit(), malloc(), free() */
+#include <fcntl.h>      /* open() */
+#include <unistd.h>     /* close(), read(), lseek() */
+#include "zlib.h"
+    /* crc32(), crc32_combine(), inflateInit2(), inflate(), inflateEnd() */
+
+#define local static
+
+/* exit with an error (return a value to allow use in an expression) */
+local int bail(char *why1, char *why2)
+{
+    fprintf(stderr, "gzjoin error: %s%s, output incomplete\n", why1, why2);
+    exit(1);
+    return 0;
+}
+
+/* -- simple buffered file input with access to the buffer -- */
+
+#define CHUNK 32768         /* must be a power of two and fit in unsigned */
+
+/* bin buffered input file type */
+typedef struct {
+    char *name;             /* name of file for error messages */
+    int fd;                 /* file descriptor */
+    unsigned left;          /* bytes remaining at next */
+    unsigned char *next;    /* next byte to read */
+    unsigned char *buf;     /* allocated buffer of length CHUNK */
+} bin;
+
+/* close a buffered file and free allocated memory */
+local void bclose(bin *in)
+{
+    if (in != NULL) {
+        if (in->fd != -1)
+            close(in->fd);
+        if (in->buf != NULL)
+            free(in->buf);
+        free(in);
+    }
+}
+
+/* open a buffered file for input, return a pointer to type bin, or NULL on
+   failure */
+local bin *bopen(char *name)
+{
+    bin *in;
+
+    in = malloc(sizeof(bin));
+    if (in == NULL)
+        return NULL;
+    in->buf = malloc(CHUNK);
+    in->fd = open(name, O_RDONLY, 0);
+    if (in->buf == NULL || in->fd == -1) {
+        bclose(in);
+        return NULL;
+    }
+    in->left = 0;
+    in->next = in->buf;
+    in->name = name;
+    return in;
+}
+
+/* load buffer from file, return -1 on read error, 0 or 1 on success, with
+   1 indicating that end-of-file was reached */
+local int bload(bin *in)
+{
+    ssize_t len;
+
+    if (in == NULL)
+        return -1;
+    if (in->left != 0)
+        return 0;
+    in->next = in->buf;
+    do {
+        len = read(in->fd, in->buf + in->left, CHUNK - in->left);
+        if (len < 0)
+            return -1;
+        in->left += (unsigned)len;
+    } while (len != 0 && in->left < CHUNK);
+    return len == 0 ? 1 : 0;
+}
+
+/* get a byte from the file, bail if end of file */
+#define bget(in) (in->left ? 0 : bload(in), \
+                  in->left ? (in->left--, *(in->next)++) : \
+                    bail("unexpected end of file on ", in->name))
+
+/* get a four-byte little-endian unsigned integer from file */
+local unsigned long bget4(bin *in)
+{
+    unsigned long val;
+
+    val = bget(in);
+    val += (unsigned long)(bget(in)) << 8;
+    val += (unsigned long)(bget(in)) << 16;
+    val += (unsigned long)(bget(in)) << 24;
+    return val;
+}
+
+/* skip bytes in file */
+local void bskip(bin *in, unsigned skip)
+{
+    /* check pointer */
+    if (in == NULL)
+        return;
+
+    /* easy case -- skip bytes in buffer */
+    if (skip <= in->left) {
+        in->left -= skip;
+        in->next += skip;
+        return;
+    }
+
+    /* skip what's in buffer, discard buffer contents */
+    skip -= in->left;
+    in->left = 0;
+
+    /* seek past multiples of CHUNK bytes */
+    if (skip > CHUNK) {
+        unsigned left;
+
+        left = skip & (CHUNK - 1);
+        if (left == 0) {
+            /* exact number of chunks: seek all the way minus one byte to check
+               for end-of-file with a read */
+            lseek(in->fd, skip - 1, SEEK_CUR);
+            if (read(in->fd, in->buf, 1) != 1)
+                bail("unexpected end of file on ", in->name);
+            return;
+        }
+
+        /* skip the integral chunks, update skip with remainder */
+        lseek(in->fd, skip - left, SEEK_CUR);
+        skip = left;
+    }
+
+    /* read more input and skip remainder */
+    bload(in);
+    if (skip > in->left)
+        bail("unexpected end of file on ", in->name);
+    in->left -= skip;
+    in->next += skip;
+}
+
+/* -- end of buffered input functions -- */
+
+/* skip the gzip header from file in */
+local void gzhead(bin *in)
+{
+    int flags;
+
+    /* verify gzip magic header and compression method */
+    if (bget(in) != 0x1f || bget(in) != 0x8b || bget(in) != 8)
+        bail(in->name, " is not a valid gzip file");
+
+    /* get and verify flags */
+    flags = bget(in);
+    if ((flags & 0xe0) != 0)
+        bail("unknown reserved bits set in ", in->name);
+
+    /* skip modification time, extra flags, and os */
+    bskip(in, 6);
+
+    /* skip extra field if present */
+    if (flags & 4) {
+        unsigned len;
+
+        len = bget(in);
+        len += (unsigned)(bget(in)) << 8;
+        bskip(in, len);
+    }
+
+    /* skip file name if present */
+    if (flags & 8)
+        while (bget(in) != 0)
+            ;
+
+    /* skip comment if present */
+    if (flags & 16)
+        while (bget(in) != 0)
+            ;
+
+    /* skip header crc if present */
+    if (flags & 2)
+        bskip(in, 2);
+}
+
+/* write a four-byte little-endian unsigned integer to out */
+local void put4(unsigned long val, FILE *out)
+{
+    putc(val & 0xff, out);
+    putc((val >> 8) & 0xff, out);
+    putc((val >> 16) & 0xff, out);
+    putc((val >> 24) & 0xff, out);
+}
+
+/* Load up zlib stream from buffered input, bail if end of file */
+local void zpull(z_streamp strm, bin *in)
+{
+    if (in->left == 0)
+        bload(in);
+    if (in->left == 0)
+        bail("unexpected end of file on ", in->name);
+    strm->avail_in = in->left;
+    strm->next_in = in->next;
+}
+
+/* Write header for gzip file to out and initialize trailer. */
+local void gzinit(unsigned long *crc, unsigned long *tot, FILE *out)
+{
+    fwrite("\x1f\x8b\x08\0\0\0\0\0\0\xff", 1, 10, out);
+    *crc = crc32(0L, Z_NULL, 0);
+    *tot = 0;
+}
+
+/* Copy the compressed data from name, zeroing the last block bit of the last
+   block if clr is true, and adding empty blocks as needed to get to a byte
+   boundary.  If clr is false, then the last block becomes the last block of
+   the output, and the gzip trailer is written.  crc and tot maintains the
+   crc and length (modulo 2^32) of the output for the trailer.  The resulting
+   gzip file is written to out.  gzinit() must be called before the first call
+   of gzcopy() to write the gzip header and to initialize crc and tot. */
+local void gzcopy(char *name, int clr, unsigned long *crc, unsigned long *tot,
+                  FILE *out)
+{
+    int ret;                /* return value from zlib functions */
+    int pos;                /* where the "last block" bit is in byte */
+    int last;               /* true if processing the last block */
+    bin *in;                /* buffered input file */
+    unsigned char *start;   /* start of compressed data in buffer */
+    unsigned char *junk;    /* buffer for uncompressed data -- discarded */
+    z_off_t len;            /* length of uncompressed data (support > 4 GB) */
+    z_stream strm;          /* zlib inflate stream */
+
+    /* open gzip file and skip header */
+    in = bopen(name);
+    if (in == NULL)
+        bail("could not open ", name);
+    gzhead(in);
+
+    /* allocate buffer for uncompressed data and initialize raw inflate
+       stream */
+    junk = malloc(CHUNK);
+    strm.zalloc = Z_NULL;
+    strm.zfree = Z_NULL;
+    strm.opaque = Z_NULL;
+    strm.avail_in = 0;
+    strm.next_in = Z_NULL;
+    ret = inflateInit2(&strm, -15);
+    if (junk == NULL || ret != Z_OK)
+        bail("out of memory", "");
+
+    /* inflate and copy compressed data, clear last-block bit if requested */
+    len = 0;
+    zpull(&strm, in);
+    start = strm.next_in;
+    last = start[0] & 1;
+    if (last && clr)
+        start[0] &= ~1;
+    strm.avail_out = 0;
+    for (;;) {
+        /* if input used and output done, write used input and get more */
+        if (strm.avail_in == 0 && strm.avail_out != 0) {
+            fwrite(start, 1, strm.next_in - start, out);
+            start = in->buf;
+            in->left = 0;
+            zpull(&strm, in);
+        }
+
+        /* decompress -- return early when end-of-block reached */
+        strm.avail_out = CHUNK;
+        strm.next_out = junk;
+        ret = inflate(&strm, Z_BLOCK);
+        switch (ret) {
+        case Z_MEM_ERROR:
+            bail("out of memory", "");
+        case Z_DATA_ERROR:
+            bail("invalid compressed data in ", in->name);
+        }
+
+        /* update length of uncompressed data */
+        len += CHUNK - strm.avail_out;
+
+        /* check for block boundary (only get this when block copied out) */
+        if (strm.data_type & 128) {
+            /* if that was the last block, then done */
+            if (last)
+                break;
+
+            /* number of unused bits in last byte */
+            pos = strm.data_type & 7;
+
+            /* find the next last-block bit */
+            if (pos != 0) {
+                /* next last-block bit is in last used byte */
+                pos = 0x100 >> pos;
+                last = strm.next_in[-1] & pos;
+                if (last && clr)
+                    strm.next_in[-1] &= ~pos;
+            }
+            else {
+                /* next last-block bit is in next unused byte */
+                if (strm.avail_in == 0) {
+                    /* don't have that byte yet -- get it */
+                    fwrite(start, 1, strm.next_in - start, out);
+                    start = in->buf;
+                    in->left = 0;
+                    zpull(&strm, in);
+                }
+                last = strm.next_in[0] & 1;
+                if (last && clr)
+                    strm.next_in[0] &= ~1;
+            }
+        }
+    }
+
+    /* update buffer with unused input */
+    in->left = strm.avail_in;
+    in->next = strm.next_in;
+
+    /* copy used input, write empty blocks to get to byte boundary */
+    pos = strm.data_type & 7;
+    fwrite(start, 1, in->next - start - 1, out);
+    last = in->next[-1];
+    if (pos == 0 || !clr)
+        /* already at byte boundary, or last file: write last byte */
+        putc(last, out);
+    else {
+        /* append empty blocks to last byte */
+        last &= ((0x100 >> pos) - 1);       /* assure unused bits are zero */
+        if (pos & 1) {
+            /* odd -- append an empty stored block */
+            putc(last, out);
+            if (pos == 1)
+                putc(0, out);               /* two more bits in block header */
+            fwrite("\0\0\xff\xff", 1, 4, out);
+        }
+        else {
+            /* even -- append 1, 2, or 3 empty fixed blocks */
+            switch (pos) {
+            case 6:
+                putc(last | 8, out);
+                last = 0;
+            case 4:
+                putc(last | 0x20, out);
+                last = 0;
+            case 2:
+                putc(last | 0x80, out);
+                putc(0, out);
+            }
+        }
+    }
+
+    /* update crc and tot */
+    *crc = crc32_combine(*crc, bget4(in), len);
+    *tot += (unsigned long)len;
+
+    /* clean up */
+    inflateEnd(&strm);
+    free(junk);
+    bclose(in);
+
+    /* write trailer if this is the last gzip file */
+    if (!clr) {
+        put4(*crc, out);
+        put4(*tot, out);
+    }
+}
+
+/* join the gzip files on the command line, write result to stdout */
+int main(int argc, char **argv)
+{
+    unsigned long crc, tot;     /* running crc and total uncompressed length */
+
+    /* skip command name */
+    argc--;
+    argv++;
+
+    /* show usage if no arguments */
+    if (argc == 0) {
+        fputs("gzjoin usage: gzjoin f1.gz [f2.gz [f3.gz ...]] > fjoin.gz\n",
+              stderr);
+        return 0;
+    }
+
+    /* join gzip files on command line and write to stdout */
+    gzinit(&crc, &tot, stdout);
+    while (argc--)
+        gzcopy(*argv++, argc, &crc, &tot, stdout);
+
+    /* done */
+    return 0;
+}

examples/gzlog.c

@@ -0,0 +1,413 @@
+/*
+ * gzlog.c
+ * Copyright (C) 2004 Mark Adler
+ * For conditions of distribution and use, see copyright notice in gzlog.h
+ * version 1.0, 26 Nov 2004
+ *
+ */
+
+#include <string.h>             /* memcmp() */
+#include <stdlib.h>             /* malloc(), free(), NULL */
+#include <sys/types.h>          /* size_t, off_t */
+#include <unistd.h>             /* read(), close(), sleep(), ftruncate(), */
+                                /* lseek() */
+#include <fcntl.h>              /* open() */
+#include <sys/file.h>           /* flock() */
+#include "zlib.h"               /* deflateInit2(), deflate(), deflateEnd() */
+
+#include "gzlog.h"              /* interface */
+#define local static
+
+/* log object structure */
+typedef struct {
+    int id;                 /* object identifier */
+    int fd;                 /* log file descriptor */
+    off_t extra;            /* offset of extra "ap" subfield */
+    off_t mark_off;         /* offset of marked data */
+    off_t last_off;         /* offset of last block */
+    unsigned long crc;      /* uncompressed crc */
+    unsigned long len;      /* uncompressed length (modulo 2^32) */
+    unsigned stored;        /* length of current stored block */
+} gz_log;
+
+#define GZLOGID 19334       /* gz_log object identifier */
+
+#define LOCK_RETRY 1            /* retry lock once a second */
+#define LOCK_PATIENCE 1200      /* try about twenty minutes before forcing */
+
+/* acquire a lock on a file */
+local int lock(int fd)
+{
+    int patience;
+
+    /* try to lock every LOCK_RETRY seconds for LOCK_PATIENCE seconds */
+    patience = LOCK_PATIENCE;
+    do {
+        if (flock(fd, LOCK_EX + LOCK_NB) == 0)
+            return 0;
+        (void)sleep(LOCK_RETRY);
+        patience -= LOCK_RETRY;
+    } while (patience > 0);
+
+    /* we've run out of patience -- give up */
+    return -1;
+}
+
+/* release lock */
+local void unlock(int fd)
+{
+    (void)flock(fd, LOCK_UN);
+}
+
+/* release a log object */
+local void log_clean(gz_log *log)
+{
+    unlock(log->fd);
+    (void)close(log->fd);
+    free(log);
+}
+
+/* read an unsigned long from a byte buffer little-endian */
+local unsigned long make_ulg(unsigned char *buf)
+{
+    int n;
+    unsigned long val;
+
+    val = (unsigned long)(*buf++);
+    for (n = 8; n < 32; n += 8)
+        val += (unsigned long)(*buf++) << n;
+    return val;
+}
+
+/* read an off_t from a byte buffer little-endian */
+local off_t make_off(unsigned char *buf)
+{
+    int n;
+    off_t val;
+
+    val = (off_t)(*buf++);
+    for (n = 8; n < 64; n += 8)
+        val += (off_t)(*buf++) << n;
+    return val;
+}
+
+/* write an unsigned long little-endian to byte buffer */
+local void dice_ulg(unsigned long val, unsigned char *buf)
+{
+    int n;
+
+    for (n = 0; n < 4; n++) {
+        *buf++ = val & 0xff;
+        val >>= 8;
+    }
+}
+
+/* write an off_t little-endian to byte buffer */
+local void dice_off(off_t val, unsigned char *buf)
+{
+    int n;
+
+    for (n = 0; n < 8; n++) {
+        *buf++ = val & 0xff;
+        val >>= 8;
+    }
+}
+
+/* initial, empty gzip file for appending */
+local char empty_gz[] = {
+    0x1f, 0x8b,                 /* magic gzip id */
+    8,                          /* compression method is deflate */
+    4,                          /* there is an extra field */
+    0, 0, 0, 0,                 /* no modification time provided */
+    0, 0xff,                    /* no extra flags, no OS */
+    20, 0, 'a', 'p', 16, 0,     /* extra field with "ap" subfield */
+    32, 0, 0, 0, 0, 0, 0, 0,    /* offset of uncompressed data */
+    32, 0, 0, 0, 0, 0, 0, 0,    /* offset of last block */
+    1, 0, 0, 0xff, 0xff,        /* empty stored block (last) */
+    0, 0, 0, 0,                 /* crc */
+    0, 0, 0, 0                  /* uncompressed length */
+};
+
+/* initialize a log object with locking */
+void *gzlog_open(char *path)
+{
+    unsigned xlen;
+    unsigned char temp[20];
+    unsigned sub_len;
+    int good;
+    gz_log *log;
+
+    /* allocate log structure */
+    log = malloc(sizeof(gz_log));
+    if (log == NULL)
+        return NULL;
+    log->id = GZLOGID;
+
+    /* open file, creating it if necessary, and locking it */
+    log->fd = open(path, O_RDWR | O_CREAT, 0600);
+    if (log->fd < 0) {
+        free(log);
+        return NULL;
+    }
+    if (lock(log->fd)) {
+        close(log->fd);
+        free(log);
+        return NULL;
+    }
+
+    /* if file is empty, write new gzip stream */
+    if (lseek(log->fd, 0, SEEK_END) == 0) {
+        if (write(log->fd, empty_gz, sizeof(empty_gz)) != sizeof(empty_gz)) {
+            log_clean(log);
+            return NULL;
+        }
+    }
+
+    /* check gzip header */
+    (void)lseek(log->fd, 0, SEEK_SET);
+    if (read(log->fd, temp, 12) != 12 || temp[0] != 0x1f ||
+        temp[1] != 0x8b || temp[2] != 8 || (temp[3] & 4) == 0) {
+        log_clean(log);
+        return NULL;
+    }
+
+    /* process extra field to find "ap" sub-field */
+    xlen = temp[10] + (temp[11] << 8);
+    good = 0;
+    while (xlen) {
+        if (xlen < 4 || read(log->fd, temp, 4) != 4)
+            break;
+        sub_len = temp[2];
+        sub_len += temp[3] << 8;
+        xlen -= 4;
+        if (memcmp(temp, "ap", 2) == 0 && sub_len == 16) {
+            good = 1;
+            break;
+        }
+        if (xlen < sub_len)
+            break;
+        (void)lseek(log->fd, sub_len, SEEK_CUR);
+        xlen -= sub_len;
+    }
+    if (!good) {
+        log_clean(log);
+        return NULL;
+    }
+
+    /* read in "ap" sub-field */
+    log->extra = lseek(log->fd, 0, SEEK_CUR);
+    if (read(log->fd, temp, 16) != 16) {
+        log_clean(log);
+        return NULL;
+    }
+    log->mark_off = make_off(temp);
+    log->last_off = make_off(temp + 8);
+
+    /* get crc, length of gzip file */
+    (void)lseek(log->fd, log->last_off, SEEK_SET);
+    if (read(log->fd, temp, 13) != 13 ||
+        memcmp(temp, "\001\000\000\377\377", 5) != 0) {
+        log_clean(log);
+        return NULL;
+    }
+    log->crc = make_ulg(temp + 5);
+    log->len = make_ulg(temp + 9);
+
+    /* set up to write over empty last block */
+    (void)lseek(log->fd, log->last_off + 5, SEEK_SET);
+    log->stored = 0;
+    return (void *)log;
+}
+
+/* maximum amount to put in a stored block before starting a new one */
+#define MAX_BLOCK 16384
+
+/* write a block to a log object */
+int gzlog_write(void *obj, char *data, size_t len)
+{
+    size_t some;
+    unsigned char temp[5];
+    gz_log *log;
+
+    /* check object */
+    log = (gz_log *)obj;
+    if (log == NULL || log->id != GZLOGID)
+        return 1;
+
+    /* write stored blocks until all of the input is written */
+    do {
+        some = MAX_BLOCK - log->stored;
+        if (some > len)
+            some = len;
+        if (write(log->fd, data, some) != some)
+            return 1;
+        log->crc = crc32(log->crc, data, some);
+        log->len += some;
+        len -= some;
+        data += some;
+        log->stored += some;
+
+        /* if the stored block is full, end it and start another */
+        if (log->stored == MAX_BLOCK) {
+            (void)lseek(log->fd, log->last_off, SEEK_SET);
+            temp[0] = 0;
+            dice_ulg(log->stored + ((unsigned long)(~log->stored) << 16),
+                     temp + 1);
+            if (write(log->fd, temp, 5) != 5)
+                return 1;
+            log->last_off = lseek(log->fd, log->stored, SEEK_CUR);
+            (void)lseek(log->fd, 5, SEEK_CUR);
+            log->stored = 0;
+        }
+    } while (len);
+    return 0;
+}
+
+/* recompress the remaining stored deflate data in place */
+local int recomp(gz_log *log)
+{
+    z_stream strm;
+    size_t len, max;
+    unsigned char *in;
+    unsigned char *out;
+    unsigned char temp[16];
+
+    /* allocate space and read it all in (it's around 1 MB) */
+    len = log->last_off - log->mark_off;
+    max = len + (len >> 12) + (len >> 14) + 11;
+    out = malloc(max);
+    if (out == NULL)
+        return 1;
+    in = malloc(len);
+    if (in == NULL) {
+        free(out);
+        return 1;
+    }
+    (void)lseek(log->fd, log->mark_off, SEEK_SET);
+    if (read(log->fd, in, len) != len) {
+        free(in);
+        free(out);
+        return 1;
+    }
+
+    /* recompress in memory, decoding stored data as we go */
+    /* note: this assumes that unsigned is four bytes or more */
+    /*       consider not making that assumption */
+    strm.zalloc = Z_NULL;
+    strm.zfree = Z_NULL;
+    strm.opaque = Z_NULL;
+    if (deflateInit2(&strm, Z_BEST_COMPRESSION, Z_DEFLATED, -15, 8,
+        Z_DEFAULT_STRATEGY) != Z_OK) {
+        free(in);
+        free(out);
+        return 1;
+    }
+    strm.next_in = in;
+    strm.avail_out = max;
+    strm.next_out = out;
+    while (len >= 5) {
+        if (strm.next_in[0] != 0)
+            break;
+        strm.avail_in = strm.next_in[1] + (strm.next_in[2] << 8);
+        strm.next_in += 5;
+        len -= 5;
+        if (strm.avail_in != 0) {
+            if (len < strm.avail_in)
+                break;
+            len -= strm.avail_in;
+            (void)deflate(&strm, Z_NO_FLUSH);
+            if (strm.avail_in != 0 || strm.avail_out == 0)
+                break;
+        }
+    }
+    (void)deflate(&strm, Z_SYNC_FLUSH);
+    (void)deflateEnd(&strm);
+    free(in);
+    if (len != 0 || strm.avail_out == 0) {
+        free(out);
+        return 1;
+    }
+
+    /* overwrite stored data with compressed data */
+    (void)lseek(log->fd, log->mark_off, SEEK_SET);
+    len = max - strm.avail_out;
+    if (write(log->fd, out, len) != len) {
+        free(out);
+        return 1;
+    }
+    free(out);
+
+    /* write last empty block, crc, and length */
+    log->mark_off = log->last_off = lseek(log->fd, 0, SEEK_CUR);
+    temp[0] = 1;
+    dice_ulg(0xffffL << 16, temp + 1);
+    dice_ulg(log->crc, temp + 5);
+    dice_ulg(log->len, temp + 9);
+    if (write(log->fd, temp, 13) != 13)
+        return 1;
+
+    /* truncate file to discard remaining stored data and old trailer */
+    ftruncate(log->fd, lseek(log->fd, 0, SEEK_CUR));
+
+    /* update extra field to point to new last empty block */
+    (void)lseek(log->fd, log->extra, SEEK_SET);
+    dice_off(log->mark_off, temp);
+    dice_off(log->last_off, temp + 8);
+    if (write(log->fd, temp, 16) != 16)
+        return 1;
+    return 0;
+}
+
+/* maximum accumulation of stored blocks before compressing */
+#define MAX_STORED 1048576
+
+/* close log object */
+int gzlog_close(void *obj)
+{
+    unsigned char temp[8];
+    gz_log *log;
+
+    /* check object */
+    log = (gz_log *)obj;
+    if (log == NULL || log->id != GZLOGID)
+        return 1;
+
+    /* go to start of most recent block being written */
+    (void)lseek(log->fd, log->last_off, SEEK_SET);
+
+    /* if some stuff was put there, update block */
+    if (log->stored) {
+        temp[0] = 0;
+        dice_ulg(log->stored + ((unsigned long)(~log->stored) << 16),
+                 temp + 1);
+        if (write(log->fd, temp, 5) != 5)
+            return 1;
+        log->last_off = lseek(log->fd, log->stored, SEEK_CUR);
+    }
+
+    /* write last block (empty) */
+    if (write(log->fd, "\001\000\000\377\377", 5) != 5)
+        return 1;
+
+    /* write updated crc and uncompressed length */
+    dice_ulg(log->crc, temp);
+    dice_ulg(log->len, temp + 4);
+    if (write(log->fd, temp, 8) != 8)
+        return 1;
+
+    /* put offset of that last block in gzip extra block */
+    (void)lseek(log->fd, log->extra + 8, SEEK_SET);
+    dice_off(log->last_off, temp);
+    if (write(log->fd, temp, 8) != 8)
+        return 1;
+
+    /* if more than 1 MB stored, then time to compress it */
+    if (log->last_off - log->mark_off > MAX_STORED) {
+        if (recomp(log))
+            return 1;
+    }
+
+    /* unlock and close file */
+    log_clean(log);
+    return 0;
+}

examples/gzlog.h

@@ -0,0 +1,58 @@
+/* gzlog.h
+  Copyright (C) 2004 Mark Adler, all rights reserved
+  version 1.0, 26 Nov 2004
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the author be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+
+  Mark Adler    madler@alumni.caltech.edu
+ */
+
+/*
+   The gzlog object allows writing short messages to a gzipped log file,
+   opening the log file locked for small bursts, and then closing it.  The log
+   object works by appending stored data to the gzip file until 1 MB has been
+   accumulated.  At that time, the stored data is compressed, and replaces the
+   uncompressed data in the file.  The log file is truncated to its new size at
+   that time.  After closing, the log file is always valid gzip file that can
+   decompressed to recover what was written.
+
+   A gzip header "extra" field contains two file offsets for appending.  The
+   first points to just after the last compressed data.  The second points to
+   the last stored block in the deflate stream, which is empty.  All of the
+   data between those pointers is uncompressed.
+ */
+
+/* Open a gzlog object, creating the log file if it does not exist.  Return
+   NULL on error.  Note that gzlog_open() could take a long time to return if
+   there is difficulty in locking the file. */
+void *gzlog_open(char *path);
+
+/* Write to a gzlog object.  Return non-zero on error.  This function will
+   simply write data to the file uncompressed.  Compression of the data
+   will not occur until gzlog_close() is called.  It is expected that
+   gzlog_write() is used for a short message, and then gzlog_close() is
+   called.  If a large amount of data is to be written, then the application
+   should write no more than 1 MB at a time with gzlog_write() before
+   calling gzlog_close() and then gzlog_open() again. */
+int gzlog_write(void *log, char *data, size_t len);
+
+/* Close a gzlog object.  Return non-zero on error.  The log file is locked
+   until this function is called.  This function will compress stored data
+   at the end of the gzip file if at least 1 MB has been accumulated.  Note
+   that the file will not be a valid gzip file until this function completes.
+ */
+int gzlog_close(void *log);

examples/zlib_how.html

@@ -0,0 +1,523 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"
+  "http://www.w3.org/TR/REC-html40/loose.dtd">
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
+<title>zlib Usage Example</title>
+<!--  Copyright (c) 2004 Mark Adler.  -->
+</head>
+<body bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#00A000">
+<h2 align="center"> zlib Usage Example </h2>
+We often get questions about how the <tt>deflate()</tt> and <tt>inflate()</tt> functions should be used.
+Users wonder when they should provide more input, when they should use more output,
+what to do with a <tt>Z_BUF_ERROR</tt>, how to make sure the process terminates properly, and
+so on.  So for those who have read <tt>zlib.h</tt> (a few times), and
+would like further edification, below is an annotated example in C of simple routines to compress and decompress
+from an input file to an output file using <tt>deflate()</tt> and <tt>inflate()</tt> respectively.  The
+annotations are interspersed between lines of the code.  So please read between the lines.
+We hope this helps explain some of the intricacies of <em>zlib</em>.
+<p>
+Without further adieu, here is the program <a href="zpipe.c"><tt>zpipe.c</tt></a>:
+<pre><b>
+/* zpipe.c: example of proper use of zlib's inflate() and deflate()
+   Not copyrighted -- provided to the public domain
+   Version 1.2  9 November 2004  Mark Adler */
+
+/* Version history:
+   1.0  30 Oct 2004  First version
+   1.1   8 Nov 2004  Add void casting for unused return values
+                     Use switch statement for inflate() return values
+   1.2   9 Nov 2004  Add assertions to document zlib guarantees
+ */
+</b></pre><!-- -->
+We now include the header files for the required definitions.  From
+<tt>stdio.h</tt> we use <tt>fopen()</tt>, <tt>fread()</tt>, <tt>fwrite()</tt>,
+<tt>feof()</tt>, <tt>ferror()</tt>, and <tt>fclose()</tt> for file i/o, and
+<tt>fputs()</tt> for error messages.  From <tt>string.h</tt> we use
+<tt>strcmp()</tt> for command line argument processing.
+From <tt>assert.h</tt> we use the <tt>assert()</tt> macro.
+From <tt>zlib.h</tt>
+we use the basic compression functions <tt>deflateInit()</tt>,
+<tt>deflate()</tt>, and <tt>deflateEnd()</tt>, and the basic decompression
+functions <tt>inflateInit()</tt>, <tt>inflate()</tt>, and
+<tt>inflateEnd()</tt>.
+<pre><b>
+#include &lt;stdio.h&gt;
+#include &lt;string.h&gt;
+#include &lt;assert.h&gt;
+#include "zlib.h"
+</b></pre><!-- -->
+<tt>CHUNK</tt> is simply the buffer size for feeding data to and pulling data
+from the <em>zlib</em> routines.  Larger buffer sizes would be more efficient,
+especially for <tt>inflate()</tt>.  If the memory is available, buffers sizes
+on the order of 128K or 256K bytes should be used.
+<pre><b>
+#define CHUNK 16384
+</b></pre><!-- -->
+The <tt>def()</tt> routine compresses data from an input file to an output file.  The output data
+will be in the <em>zlib</em> format, which is different from the <em>gzip</em> or <em>zip</em>
+formats.  The <em>zlib</em> format has a very small header of only two bytes to identify it as
+a <em>zlib</em> stream and to provide decoding information, and a four-byte trailer with a fast
+check value to verify the integrity of the uncompressed data after decoding.
+<pre><b>
+/* Compress from file source to file dest until EOF on source.
+   def() returns Z_OK on success, Z_MEM_ERROR if memory could not be
+   allocated for processing, Z_STREAM_ERROR if an invalid compression
+   level is supplied, Z_VERSION_ERROR if the version of zlib.h and the
+   version of the library linked do not match, or Z_ERRNO if there is
+   an error reading or writing the files. */
+int def(FILE *source, FILE *dest, int level)
+{
+</b></pre>
+Here are the local variables for <tt>def()</tt>.  <tt>ret</tt> will be used for <em>zlib</em>
+return codes.  <tt>flush</tt> will keep track of the current flushing state for <tt>deflate()</tt>,
+which is either no flushing, or flush to completion after the end of the input file is reached.
+<tt>have</tt> is the amount of data returned from <tt>deflate()</tt>.  The <tt>strm</tt> structure
+is used to pass information to and from the <em>zlib</em> routines, and to maintain the
+<tt>deflate()</tt> state.  <tt>in</tt> and <tt>out</tt> are the input and output buffers for
+<tt>deflate()</tt>.
+<pre><b>
+    int ret, flush;
+    unsigned have;
+    z_stream strm;
+    char in[CHUNK];
+    char out[CHUNK];
+</b></pre><!-- -->
+The first thing we do is to initialize the <em>zlib</em> state for compression using
+<tt>deflateInit()</tt>.  This must be done before the first use of <tt>deflate()</tt>.
+The <tt>zalloc</tt>, <tt>zfree</tt>, and <tt>opaque</tt> fields in the <tt>strm</tt>
+structure must be initialized before calling <tt>deflateInit()</tt>.  Here they are
+set to the <em>zlib</em> constant <tt>Z_NULL</tt> to request that <em>zlib</em> use
+the default memory allocation routines.  An application may also choose to provide
+custom memory allocation routines here.  <tt>deflateInit()</tt> will allocate on the
+order of 256K bytes for the internal state.
+(See <a href="zlib_tech.html"><em>zlib Technical Details</em></a>.)
+<p>
+<tt>deflateInit()</tt> is called with a pointer to the structure to be initialized and
+the compression level, which is an integer in the range of -1 to 9.  Lower compression
+levels result in faster execution, but less compression.  Higher levels result in
+greater compression, but slower execution.  The <em>zlib</em> constant Z_DEFAULT_COMPRESSION,
+equal to -1,
+provides a good compromise between compression and speed and is equivalent to level 6.
+Level 0 actually does no compression at all, and in fact expands the data slightly to produce
+the <em>zlib</em> format (it is not a byte-for-byte copy of the input).
+More advanced applications of <em>zlib</em>
+may use <tt>deflateInit2()</tt> here instead.  Such an application may want to reduce how
+much memory will be used, at some price in compression.  Or it may need to request a
+<em>gzip</em> header and trailer instead of a <em>zlib</em> header and trailer, or raw
+encoding with no header or trailer at all.
+<p>
+We must check the return value of <tt>deflateInit()</tt> against the <em>zlib</em> constant
+<tt>Z_OK</tt> to make sure that it was able to
+allocate memory for the internal state, and that the provided arguments were valid.
+<tt>deflateInit()</tt> will also check that the version of <em>zlib</em> that the <tt>zlib.h</tt>
+file came from matches the version of <em>zlib</em> actually linked with the program.  This
+is especially important for environments in which <em>zlib</em> is a shared library.
+<p>
+Note that an application can initialize multiple, independent <em>zlib</em> streams, which can
+operate in parallel.  The state information maintained in the structure allows the <em>zlib</em>
+routines to be reentrant.
+<pre><b>
+    /* allocate deflate state */
+    strm.zalloc = Z_NULL;
+    strm.zfree = Z_NULL;
+    strm.opaque = Z_NULL;
+    ret = deflateInit(&amp;strm, level);
+    if (ret != Z_OK)
+        return ret;
+</b></pre><!-- -->
+With the pleasantries out of the way, now we can get down to business.  The outer <tt>do</tt>-loop
+reads all of the input file and exits at the bottom of the loop once end-of-file is reached.
+This loop contains the only call of <tt>deflate()</tt>.  So we must make sure that all of the
+input data has been processed and that all of the output data has been generated and consumed
+before we fall out of the loop at the bottom.
+<pre><b>
+    /* compress until end of file */
+    do {
+</b></pre>
+We start off by reading data from the input file.  The number of bytes read is put directly
+into <tt>avail_in</tt>, and a pointer to those bytes is put into <tt>next_in</tt>.  We also
+check to see if end-of-file on the input has been reached.  If we are at the end of file, then <tt>flush</tt> is set to the
+<em>zlib</em> constant <tt>Z_FINISH</tt>, which is later passed to <tt>deflate()</tt> to
+indicate that this is the last chunk of input data to compress.  We need to use <tt>feof()</tt>
+to check for end-of-file as opposed to seeing if fewer than <tt>CHUNK</tt> bytes have been read.  The
+reason is that if the input file length is an exact multiple of <tt>CHUNK</tt>, we will miss
+the fact that we got to the end-of-file, and not know to tell <tt>deflate()</tt> to finish
+up the compressed stream.  If we are not yet at the end of the input, then the <em>zlib</em>
+constant <tt>Z_NO_FLUSH</tt> will be passed to <tt>deflate</tt> to indicate that we are still
+in the middle of the uncompressed data.
+<p>
+If there is an error in reading from the input file, the process is aborted with
+<tt>deflateEnd()</tt> being called to free the allocated <em>zlib</em> state before returning
+the error.  We wouldn't want a memory leak, now would we?  <tt>deflateEnd()</tt> can be called
+at any time after the state has been initialized.  Once that's done, <tt>deflateInit()</tt> (or
+<tt>deflateInit2()</tt>) would have to be called to start a new compression process.  There is
+no point here in checking the <tt>deflateEnd()</tt> return code.  The deallocation can't fail.
+<pre><b>
+        strm.avail_in = fread(in, 1, CHUNK, source);
+        if (ferror(source)) {
+            (void)deflateEnd(&amp;strm);
+            return Z_ERRNO;
+        }
+        flush = feof(source) ? Z_FINISH : Z_NO_FLUSH;
+        strm.next_in = in;
+</b></pre><!-- -->
+The inner <tt>do</tt>-loop passes our chunk of input data to <tt>deflate()</tt>, and then
+keeps calling <tt>deflate()</tt> until it is done producing output.  Once there is no more
+new output, <tt>deflate()</tt> is guaranteed to have consumed all of the input, i.e.,
+<tt>avail_in</tt> will be zero.
+<pre><b>
+        /* run deflate() on input until output buffer not full, finish
+           compression if all of source has been read in */
+        do {
+</b></pre>
+Output space is provided to <tt>deflate()</tt> by setting <tt>avail_out</tt> to the number
+of available output bytes and <tt>next_out</tt> to a pointer to that space.
+<pre><b>
+            strm.avail_out = CHUNK;
+            strm.next_out = out;
+</b></pre>
+Now we call the compression engine itself, <tt>deflate()</tt>.  It takes as many of the
+<tt>avail_in</tt> bytes at <tt>next_in</tt> as it can process, and writes as many as
+<tt>avail_out</tt> bytes to <tt>next_out</tt>.  Those counters and pointers are then
+updated past the input data consumed and the output data written.  It is the amount of
+output space available that may limit how much input is consumed.
+Hence the inner loop to make sure that
+all of the input is consumed by providing more output space each time.  Since <tt>avail_in</tt>
+and <tt>next_in</tt> are updated by <tt>deflate()</tt>, we don't have to mess with those
+between <tt>deflate()</tt> calls until it's all used up.
+<p>
+The parameters to <tt>deflate()</tt> are a pointer to the <tt>strm</tt> structure containing
+the input and output information and the internal compression engine state, and a parameter
+indicating whether and how to flush data to the output.  Normally <tt>deflate</tt> will consume
+several K bytes of input data before producing any output (except for the header), in order
+to accumulate statistics on the data for optimum compression.  It will then put out a burst of
+compressed data, and proceed to consume more input before the next burst.  Eventually,
+<tt>deflate()</tt>
+must be told to terminate the stream, complete the compression with provided input data, and
+write out the trailer check value.  <tt>deflate()</tt> will continue to compress normally as long
+as the flush parameter is <tt>Z_NO_FLUSH</tt>.  Once the <tt>Z_FINISH</tt> parameter is provided,
+<tt>deflate()</tt> will begin to complete the compressed output stream.  However depending on how
+much output space is provided, <tt>deflate()</tt> may have to be called several times until it
+has provided the complete compressed stream, even after it has consumed all of the input.  The flush
+parameter must continue to be <tt>Z_FINISH</tt> for those subsequent calls.
+<p>
+There are other values of the flush parameter that are used in more advanced applications.  You can
+force <tt>deflate()</tt> to produce a burst of output that encodes all of the input data provided
+so far, even if it wouldn't have otherwise, for example to control data latency on a link with
+compressed data.  You can also ask that <tt>deflate()</tt> do that as well as erase any history up to
+that point so that what follows can be decompressed independently, for example for random access
+applications.  Both requests will degrade compression by an amount depending on how often such
+requests are made.
+<p>
+<tt>deflate()</tt> has a return value that can indicate errors, yet we do not check it here.  Why
+not?  Well, it turns out that <tt>deflate()</tt> can do no wrong here.  Let's go through
+<tt>deflate()</tt>'s return values and dispense with them one by one.  The possible values are
+<tt>Z_OK</tt>, <tt>Z_STREAM_END</tt>, <tt>Z_STREAM_ERROR</tt>, or <tt>Z_BUF_ERROR</tt>.  <tt>Z_OK</tt>
+is, well, ok.  <tt>Z_STREAM_END</tt> is also ok and will be returned for the last call of
+<tt>deflate()</tt>.  This is already guaranteed by calling <tt>deflate()</tt> with <tt>Z_FINISH</tt>
+until it has no more output.  <tt>Z_STREAM_ERROR</tt> is only possible if the stream is not
+initialized properly, but we did initialize it properly.  There is no harm in checking for
+<tt>Z_STREAM_ERROR</tt> here, for example to check for the possibility that some
+other part of the application inadvertently clobbered the memory containing the <em>zlib</em> state.
+<tt>Z_BUF_ERROR</tt> will be explained further below, but
+suffice it to say that this is simply an indication that <tt>deflate()</tt> could not consume
+more input or produce more output.  <tt>deflate()</tt> can be called again with more output space
+or more available input, which it will be in this code.
+<pre><b>
+            ret = deflate(&amp;strm, flush);    /* no bad return value */
+            assert(ret != Z_STREAM_ERROR);  /* state not clobbered */
+</b></pre>
+Now we compute how much output <tt>deflate()</tt> provided on the last call, which is the
+difference between how much space was provided before the call, and how much output space
+is still available after the call.  Then that data, if any, is written to the output file.
+We can then reuse the output buffer for the next call of <tt>deflate()</tt>.  Again if there
+is a file i/o error, we call <tt>deflateEnd()</tt> before returning to avoid a memory leak.
+<pre><b>
+            have = CHUNK - strm.avail_out;
+            if (fwrite(out, 1, have, dest) != have || ferror(dest)) {
+                (void)deflateEnd(&amp;strm);
+                return Z_ERRNO;
+            }
+</b></pre>
+The inner <tt>do</tt>-loop is repeated until the last <tt>deflate()</tt> call fails to fill the
+provided output buffer.  Then we know that <tt>deflate()</tt> has done as much as it can with
+the provided input, and that all of that input has been consumed.  We can then fall out of this
+loop and reuse the input buffer.
+<p>
+The way we tell that <tt>deflate()</tt> has no more output is by seeing that it did not fill
+the output buffer, leaving <tt>avail_out</tt> greater than zero.  However suppose that
+<tt>deflate()</tt> has no more output, but just so happened to exactly fill the output buffer!
+<tt>avail_out</tt> is zero, and we can't tell that <tt>deflate()</tt> has done all it can.
+As far as we know, <tt>deflate()</tt>
+has more output for us.  So we call it again.  But now <tt>deflate()</tt> produces no output
+at all, and <tt>avail_out</tt> remains unchanged as <tt>CHUNK</tt>.  That <tt>deflate()</tt> call
+wasn't able to do anything, either consume input or produce output, and so it returns
+<tt>Z_BUF_ERROR</tt>.  (See, I told you I'd cover this later.)  However this is not a problem at
+all.  Now we finally have the desired indication that <tt>deflate()</tt> is really done,
+and so we drop out of the inner loop to provide more input to <tt>deflate()</tt>.
+<p>
+With <tt>flush</tt> set to <tt>Z_FINISH</tt>, this final set of <tt>deflate()</tt> calls will
+complete the output stream.  Once that is done, subsequent calls of <tt>deflate()</tt> would return
+<tt>Z_STREAM_ERROR</tt> if the flush parameter is not <tt>Z_FINISH</tt>, and do no more processing
+until the state is reinitialized.
+<p>
+Some applications of <em>zlib</em> have two loops that call <tt>deflate()</tt>
+instead of the single inner loop we have here.  The first loop would call
+without flushing and feed all of the data to <tt>deflate()</tt>.  The second loop would call
+<tt>deflate()</tt> with no more
+data and the <tt>Z_FINISH</tt> parameter to complete the process.  As you can see from this
+example, that can be avoided by simply keeping track of the current flush state.
+<pre><b>
+        } while (strm.avail_out == 0);
+        assert(strm.avail_in == 0);     /* all input will be used */
+</b></pre><!-- -->
+Now we check to see if we have already processed all of the input file.  That information was
+saved in the <tt>flush</tt> variable, so we see if that was set to <tt>Z_FINISH</tt>.  If so,
+then we're done and we fall out of the outer loop.  We're guaranteed to get <tt>Z_STREAM_END</tt>
+from the last <tt>deflate()</tt> call, since we ran it until the last chunk of input was
+consumed and all of the output was generated.
+<pre><b>
+        /* done when last data in file processed */
+    } while (flush != Z_FINISH);
+    assert(ret == Z_STREAM_END);        /* stream will be complete */
+</b></pre><!-- -->
+The process is complete, but we still need to deallocate the state to avoid a memory leak
+(or rather more like a memory hemorrhage if you didn't do this).  Then
+finally we can return with a happy return value.
+<pre><b>
+    /* clean up and return */
+    (void)deflateEnd(&amp;strm);
+    return Z_OK;
+}
+</b></pre><!-- -->
+Now we do the same thing for decompression in the <tt>inf()</tt> routine. <tt>inf()</tt>
+decompresses what is hopefully a valid <em>zlib</em> stream from the input file and writes the
+uncompressed data to the output file.  Much of the discussion above for <tt>def()</tt>
+applies to <tt>inf()</tt> as well, so the discussion here will focus on the differences between
+the two.
+<pre><b>
+/* Decompress from file source to file dest until stream ends or EOF.
+   inf() returns Z_OK on success, Z_MEM_ERROR if memory could not be
+   allocated for processing, Z_DATA_ERROR if the deflate data is
+   invalid or incomplete, Z_VERSION_ERROR if the version of zlib.h and
+   the version of the library linked do not match, or Z_ERRNO if there
+   is an error reading or writing the files. */
+int inf(FILE *source, FILE *dest)
+{
+</b></pre>
+The local variables have the same functionality as they do for <tt>def()</tt>.  The
+only difference is that there is no <tt>flush</tt> variable, since <tt>inflate()</tt>
+can tell from the <em>zlib</em> stream itself when the stream is complete.
+<pre><b>
+    int ret;
+    unsigned have;
+    z_stream strm;
+    char in[CHUNK];
+    char out[CHUNK];
+</b></pre><!-- -->
+The initialization of the state is the same, except that there is no compression level,
+of course, and two more elements of the structure are initialized.  <tt>avail_in</tt>
+and <tt>next_in</tt> must be initialized before calling <tt>inflateInit()</tt>.  This
+is because the application has the option to provide the start of the zlib stream in
+order for <tt>inflateInit()</tt> to have access to information about the compression
+method to aid in memory allocation.  In the current implementation of <em>zlib</em>
+(up through versions 1.2.x), the method-dependent memory allocations are deferred to the first call of
+<tt>inflate()</tt> anyway.  However those fields must be initialized since later versions
+of <em>zlib</em> that provide more compression methods may take advantage of this interface.
+In any case, no decompression is performed by <tt>inflateInit()</tt>, so the
+<tt>avail_out</tt> and <tt>next_out</tt> fields do not need to be initialized before calling.
+<p>
+Here <tt>avail_in</tt> is set to zero and <tt>next_in</tt> is set to <tt>Z_NULL</tt> to
+indicate that no input data is being provided.
+<pre><b>
+    /* allocate inflate state */
+    strm.zalloc = Z_NULL;
+    strm.zfree = Z_NULL;
+    strm.opaque = Z_NULL;
+    strm.avail_in = 0;
+    strm.next_in = Z_NULL;
+    ret = inflateInit(&amp;strm);
+    if (ret != Z_OK)
+        return ret;
+</b></pre><!-- -->
+The outer <tt>do</tt>-loop decompresses input until <tt>inflate()</tt> indicates
+that it has reached the end of the compressed data and has produced all of the uncompressed
+output.  This is in contrast to <tt>def()</tt> which processes all of the input file.
+If end-of-file is reached before the compressed data self-terminates, then the compressed
+data is incomplete and an error is returned.
+<pre><b>
+    /* decompress until deflate stream ends or end of file */
+    do {
+</b></pre>
+We read input data and set the <tt>strm</tt> structure accordingly.  If we've reached the
+end of the input file, then we leave the outer loop and report an error, since the
+compressed data is incomplete.  Note that we may read more data than is eventually consumed
+by <tt>inflate()</tt>, if the input file continues past the <em>zlib</em> stream.
+For applications where <em>zlib</em> streams are embedded in other data, this routine would
+need to be modified to return the unused data, or at least indicate how much of the input
+data was not used, so the application would know where to pick up after the <em>zlib</em> stream.
+<pre><b>
+        strm.avail_in = fread(in, 1, CHUNK, source);
+        if (ferror(source)) {
+            (void)inflateEnd(&amp;strm);
+            return Z_ERRNO;
+        }
+        if (strm.avail_in == 0)
+            break;
+        strm.next_in = in;
+</b></pre><!-- -->
+The inner <tt>do</tt>-loop has the same function it did in <tt>def()</tt>, which is to
+keep calling <tt>inflate()</tt> until has generated all of the output it can with the
+provided input.
+<pre><b>
+        /* run inflate() on input until output buffer not full */
+        do {
+</b></pre>
+Just like in <tt>def()</tt>, the same output space is provided for each call of <tt>inflate()</tt>.
+<pre><b>
+            strm.avail_out = CHUNK;
+            strm.next_out = out;
+</b></pre>
+Now we run the decompression engine itself.  There is no need to adjust the flush parameter, since
+the <em>zlib</em> format is self-terminating. The main difference here is that there are
+return values that we need to pay attention to.  <tt>Z_DATA_ERROR</tt>
+indicates that <tt>inflate()</tt> detected an error in the <em>zlib</em> compressed data format,
+which means that either the data is not a <em>zlib</em> stream to begin with, or that the data was
+corrupted somewhere along the way since it was compressed.  The other error to be processed is
+<tt>Z_MEM_ERROR</tt>, which can occur since memory allocation is deferred until <tt>inflate()</tt>
+needs it, unlike <tt>deflate()</tt>, whose memory is allocated at the start by <tt>deflateInit()</tt>.
+<p>
+Advanced applications may use
+<tt>deflateSetDictionary()</tt> to prime <tt>deflate()</tt> with a set of likely data to improve the
+first 32K or so of compression.  This is noted in the <em>zlib</em> header, so <tt>inflate()</tt>
+requests that that dictionary be provided before it can start to decompress.  Without the dictionary,
+correct decompression is not possible.  For this routine, we have no idea what the dictionary is,
+so the <tt>Z_NEED_DICT</tt> indication is converted to a <tt>Z_DATA_ERROR</tt>.
+<p>
+<tt>inflate()</tt> can also return <tt>Z_STREAM_ERROR</tt>, which should not be possible here,
+but could be checked for as noted above for <tt>def()</tt>.  <tt>Z_BUF_ERROR</tt> does not need to be
+checked for here, for the same reasons noted for <tt>def()</tt>.  <tt>Z_STREAM_END</tt> will be
+checked for later.
+<pre><b>
+            ret = inflate(&amp;strm, Z_NO_FLUSH);
+            assert(ret != Z_STREAM_ERROR);  /* state not clobbered */
+            switch (ret) {
+            case Z_NEED_DICT:
+                ret = Z_DATA_ERROR;     /* and fall through */
+            case Z_DATA_ERROR:
+            case Z_MEM_ERROR:
+                (void)inflateEnd(&amp;strm);
+                return ret;
+            }
+</b></pre>
+The output of <tt>inflate()</tt> is handled identically to that of <tt>deflate()</tt>.
+<pre><b>
+            have = CHUNK - strm.avail_out;
+            if (fwrite(out, 1, have, dest) != have || ferror(dest)) {
+                (void)inflateEnd(&amp;strm);
+                return Z_ERRNO;
+            }
+</b></pre>
+The inner <tt>do</tt>-loop ends when <tt>inflate()</tt> has no more output as indicated
+by not filling the output buffer, just as for <tt>deflate()</tt>.  In this case, we cannot
+assert that <tt>strm.avail_in</tt> will be zero, since the deflate stream may end before the file
+does.
+<pre><b>
+        } while (strm.avail_out == 0);
+</b></pre><!-- -->
+The outer <tt>do</tt>-loop ends when <tt>inflate()</tt> reports that it has reached the
+end of the input <em>zlib</em> stream, has completed the decompression and integrity
+check, and has provided all of the output.  This is indicated by the <tt>inflate()</tt>
+return value <tt>Z_STREAM_END</tt>.  The inner loop is guaranteed to leave <tt>ret</tt>
+equal to <tt>Z_STREAM_END</tt> if the last chunk of the input file read contained the end
+of the <em>zlib</em> stream.  So if the return value is not <tt>Z_STREAM_END</tt>, the
+loop continues to read more input.
+<pre><b>
+        /* done when inflate() says it's done */
+    } while (ret != Z_STREAM_END);
+</b></pre><!-- -->
+At this point, decompression successfully completed, or we broke out of the loop due to no
+more data being available from the input file.  If the last <tt>inflate()</tt> return value
+is not <tt>Z_STREAM_END</tt>, then the <em>zlib</em> stream was incomplete and a data error
+is returned.  Otherwise, we return with a happy return value.  Of course, <tt>inflateEnd()</tt>
+is called first to avoid a memory leak.
+<pre><b>
+    /* clean up and return */
+    (void)inflateEnd(&amp;strm);
+    return ret == Z_STREAM_END ? Z_OK : Z_DATA_ERROR;
+}
+</b></pre><!-- -->
+That ends the routines that directly use <em>zlib</em>.  The following routines make this
+a command-line program by running data through the above routines from <tt>stdin</tt> to
+<tt>stdout</tt>, and handling any errors reported by <tt>def()</tt> or <tt>inf()</tt>.
+<p>
+<tt>zerr()</tt> is used to interpret the possible error codes from <tt>def()</tt>
+and <tt>inf()</tt>, as detailed in their comments above, and print out an error message.
+Note that these are only a subset of the possible return values from <tt>deflate()</tt>
+and <tt>inflate()</tt>.
+<pre><b>
+/* report a zlib or i/o error */
+void zerr(int ret)
+{
+    fputs("zpipe: ", stderr);
+    switch (ret) {
+    case Z_ERRNO:
+        if (ferror(stdin))
+            fputs("error reading stdin\n", stderr);
+        if (ferror(stdout))
+            fputs("error writing stdout\n", stderr);
+        break;
+    case Z_STREAM_ERROR:
+        fputs("invalid compression level\n", stderr);
+        break;
+    case Z_DATA_ERROR:
+        fputs("invalid or incomplete deflate data\n", stderr);
+        break;
+    case Z_MEM_ERROR:
+        fputs("out of memory\n", stderr);
+        break;
+    case Z_VERSION_ERROR:
+        fputs("zlib version mismatch!\n", stderr);
+    }
+}
+</b></pre><!-- -->
+Here is the <tt>main()</tt> routine used to test <tt>def()</tt> and <tt>inf()</tt>.  The
+<tt>zpipe</tt> command is simply a compression pipe from <tt>stdin</tt> to <tt>stdout</tt>, if
+no arguments are given, or it is a decompression pipe if <tt>zpipe -d</tt> is used.  If any other
+arguments are provided, no compression or decompression is performed.  Instead a usage
+message is displayed.  Examples are <tt>zpipe < foo.txt > foo.txt.z</tt> to compress, and
+<tt>zpipe -d < foo.txt.z > foo.txt</tt> to decompress.
+<pre><b>
+/* compress or decompress from stdin to stdout */
+int main(int argc, char **argv)
+{
+    int ret;
+
+    /* do compression if no arguments */
+    if (argc == 1) {
+        ret = def(stdin, stdout, Z_DEFAULT_COMPRESSION);
+        if (ret != Z_OK)
+            zerr(ret);
+        return ret;
+    }
+
+    /* do decompression if -d specified */
+    else if (argc == 2 &amp;&amp; strcmp(argv[1], "-d") == 0) {
+        ret = inf(stdin, stdout);
+        if (ret != Z_OK)
+            zerr(ret);
+        return ret;
+    }
+
+    /* otherwise, report usage */
+    else {
+        fputs("zpipe usage: zpipe [-d] &lt; source &gt; dest\n", stderr);
+        return 1;
+    }
+}
+</b></pre>
+<hr>
+<i>Copyright (c) 2004 by Mark Adler<br>Last modified 13 November 2004</i>
+</body>
+</html>

examples/zpipe.c

@@ -0,0 +1,191 @@
+/* zpipe.c: example of proper use of zlib's inflate() and deflate()
+   Not copyrighted -- provided to the public domain
+   Version 1.2  9 November 2004  Mark Adler */
+
+/* Version history:
+   1.0  30 Oct 2004  First version
+   1.1   8 Nov 2004  Add void casting for unused return values
+                     Use switch statement for inflate() return values
+   1.2   9 Nov 2004  Add assertions to document zlib guarantees
+   1.3   6 Apr 2005  Remove incorrect assertion in inf()
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+#include "zlib.h"
+
+#define CHUNK 16384
+
+/* Compress from file source to file dest until EOF on source.
+   def() returns Z_OK on success, Z_MEM_ERROR if memory could not be
+   allocated for processing, Z_STREAM_ERROR if an invalid compression
+   level is supplied, Z_VERSION_ERROR if the version of zlib.h and the
+   version of the library linked do not match, or Z_ERRNO if there is
+   an error reading or writing the files. */
+int def(FILE *source, FILE *dest, int level)
+{
+    int ret, flush;
+    unsigned have;
+    z_stream strm;
+    char in[CHUNK];
+    char out[CHUNK];
+
+    /* allocate deflate state */
+    strm.zalloc = Z_NULL;
+    strm.zfree = Z_NULL;
+    strm.opaque = Z_NULL;
+    ret = deflateInit(&strm, level);
+    if (ret != Z_OK)
+        return ret;
+
+    /* compress until end of file */
+    do {
+        strm.avail_in = fread(in, 1, CHUNK, source);
+        if (ferror(source)) {
+            (void)deflateEnd(&strm);
+            return Z_ERRNO;
+        }
+        flush = feof(source) ? Z_FINISH : Z_NO_FLUSH;
+        strm.next_in = in;
+
+        /* run deflate() on input until output buffer not full, finish
+           compression if all of source has been read in */
+        do {
+            strm.avail_out = CHUNK;
+            strm.next_out = out;
+            ret = deflate(&strm, flush);    /* no bad return value */
+            assert(ret != Z_STREAM_ERROR);  /* state not clobbered */
+            have = CHUNK - strm.avail_out;
+            if (fwrite(out, 1, have, dest) != have || ferror(dest)) {
+                (void)deflateEnd(&strm);
+                return Z_ERRNO;
+            }
+        } while (strm.avail_out == 0);
+        assert(strm.avail_in == 0);     /* all input will be used */
+
+        /* done when last data in file processed */
+    } while (flush != Z_FINISH);
+    assert(ret == Z_STREAM_END);        /* stream will be complete */
+
+    /* clean up and return */
+    (void)deflateEnd(&strm);
+    return Z_OK;
+}
+
+/* Decompress from file source to file dest until stream ends or EOF.
+   inf() returns Z_OK on success, Z_MEM_ERROR if memory could not be
+   allocated for processing, Z_DATA_ERROR if the deflate data is
+   invalid or incomplete, Z_VERSION_ERROR if the version of zlib.h and
+   the version of the library linked do not match, or Z_ERRNO if there
+   is an error reading or writing the files. */
+int inf(FILE *source, FILE *dest)
+{
+    int ret;
+    unsigned have;
+    z_stream strm;
+    char in[CHUNK];
+    char out[CHUNK];
+
+    /* allocate inflate state */
+    strm.zalloc = Z_NULL;
+    strm.zfree = Z_NULL;
+    strm.opaque = Z_NULL;
+    strm.avail_in = 0;
+    strm.next_in = Z_NULL;
+    ret = inflateInit(&strm);
+    if (ret != Z_OK)
+        return ret;
+
+    /* decompress until deflate stream ends or end of file */
+    do {
+        strm.avail_in = fread(in, 1, CHUNK, source);
+        if (ferror(source)) {
+            (void)inflateEnd(&strm);
+            return Z_ERRNO;
+        }
+        if (strm.avail_in == 0)
+            break;
+        strm.next_in = in;
+
+        /* run inflate() on input until output buffer not full */
+        do {
+            strm.avail_out = CHUNK;
+            strm.next_out = out;
+            ret = inflate(&strm, Z_NO_FLUSH);
+            assert(ret != Z_STREAM_ERROR);  /* state not clobbered */
+            switch (ret) {
+            case Z_NEED_DICT:
+                ret = Z_DATA_ERROR;     /* and fall through */
+            case Z_DATA_ERROR:
+            case Z_MEM_ERROR:
+                (void)inflateEnd(&strm);
+                return ret;
+            }
+            have = CHUNK - strm.avail_out;
+            if (fwrite(out, 1, have, dest) != have || ferror(dest)) {
+                (void)inflateEnd(&strm);
+                return Z_ERRNO;
+            }
+        } while (strm.avail_out == 0);
+
+        /* done when inflate() says it's done */
+    } while (ret != Z_STREAM_END);
+
+    /* clean up and return */
+    (void)inflateEnd(&strm);
+    return ret == Z_STREAM_END ? Z_OK : Z_DATA_ERROR;
+}
+
+/* report a zlib or i/o error */
+void zerr(int ret)
+{
+    fputs("zpipe: ", stderr);
+    switch (ret) {
+    case Z_ERRNO:
+        if (ferror(stdin))
+            fputs("error reading stdin\n", stderr);
+        if (ferror(stdout))
+            fputs("error writing stdout\n", stderr);
+        break;
+    case Z_STREAM_ERROR:
+        fputs("invalid compression level\n", stderr);
+        break;
+    case Z_DATA_ERROR:
+        fputs("invalid or incomplete deflate data\n", stderr);
+        break;
+    case Z_MEM_ERROR:
+        fputs("out of memory\n", stderr);
+        break;
+    case Z_VERSION_ERROR:
+        fputs("zlib version mismatch!\n", stderr);
+    }
+}
+
+/* compress or decompress from stdin to stdout */
+int main(int argc, char **argv)
+{
+    int ret;
+
+    /* do compression if no arguments */
+    if (argc == 1) {
+        ret = def(stdin, stdout, Z_DEFAULT_COMPRESSION);
+        if (ret != Z_OK)
+            zerr(ret);
+        return ret;
+    }
+
+    /* do decompression if -d specified */
+    else if (argc == 2 && strcmp(argv[1], "-d") == 0) {
+        ret = inf(stdin, stdout);
+        if (ret != Z_OK)
+            zerr(ret);
+        return ret;
+    }
+
+    /* otherwise, report usage */
+    else {
+        fputs("zpipe usage: zpipe [-d] < source > dest\n", stderr);
+        return 1;
+    }
+}

gzio.c

@@ -1,5 +1,5 @@
 /* gzio.c -- IO on .gz files
- * Copyright (C) 1995-2003 Jean-loup Gailly.
+ * Copyright (C) 1995-2005 Jean-loup Gailly.
  * For conditions of distribution and use, see copyright notice in zlib.h
  *
  * Compile this file with -DNO_GZCOMPRESS to avoid the compression code.
@@ -11,7 +11,7 @@
 
 #include "zutil.h"
 
-#ifdef NO_DEFLATE       /* for compatiblity with old definition */
+#ifdef NO_DEFLATE       /* for compatibility with old definition */
 #  define NO_GZCOMPRESS
 #endif
 
@@ -220,7 +220,7 @@ gzFile ZEXPORT gzdopen (fd, mode)
     int fd;
     const char *mode;
 {
-    char name[20];
+    char name[46];      /* allow for up to 128-bit integers */
 
     if (fd < 0) return (gzFile)Z_NULL;
     sprintf(name, "<fd:%d>", fd); /* for debugging */
@@ -264,7 +264,7 @@ local int get_byte(s)
     if (s->z_eof) return EOF;
     if (s->stream.avail_in == 0) {
         errno = 0;
-        s->stream.avail_in = fread(s->inbuf, 1, Z_BUFSIZE, s->file);
+        s->stream.avail_in = (uInt)fread(s->inbuf, 1, Z_BUFSIZE, s->file);
         if (s->stream.avail_in == 0) {
             s->z_eof = 1;
             if (ferror(s->file)) s->z_err = Z_ERRNO;
@@ -300,7 +300,7 @@ local void check_header(s)
     if (len < 2) {
         if (len) s->inbuf[0] = s->stream.next_in[0];
         errno = 0;
-        len = fread(s->inbuf + len, 1, Z_BUFSIZE >> len, s->file);
+        len = (uInt)fread(s->inbuf + len, 1, Z_BUFSIZE >> len, s->file);
         if (len == 0 && ferror(s->file)) s->z_err = Z_ERRNO;
         s->stream.avail_in += len;
         s->stream.next_in = s->inbuf;
@@ -415,6 +415,7 @@ int ZEXPORT gzread (file, buf, len)
         s->stream.avail_out--;
         s->back = EOF;
         s->out++;
+        start++;
         if (s->last) {
             s->z_err = Z_STREAM_END;
             return 1;
@@ -436,8 +437,8 @@ int ZEXPORT gzread (file, buf, len)
                 s->stream.avail_in  -= n;
             }
             if (s->stream.avail_out > 0) {
-                s->stream.avail_out -= fread(next_out, 1, s->stream.avail_out,
-                                             s->file);
+                s->stream.avail_out -=
+                    (uInt)fread(next_out, 1, s->stream.avail_out, s->file);
             }
             len -= s->stream.avail_out;
             s->in  += len;
@@ -448,17 +449,13 @@ int ZEXPORT gzread (file, buf, len)
         if (s->stream.avail_in == 0 && !s->z_eof) {
 
             errno = 0;
-            s->stream.avail_in = fread(s->inbuf, 1, Z_BUFSIZE, s->file);
+            s->stream.avail_in = (uInt)fread(s->inbuf, 1, Z_BUFSIZE, s->file);
             if (s->stream.avail_in == 0) {
                 s->z_eof = 1;
                 if (ferror(s->file)) {
                     s->z_err = Z_ERRNO;
                     break;
                 }
-                if (feof(s->file)) {        /* avoid error for empty file */
-                    s->z_err = Z_STREAM_END;
-                    break;
-                }
             }
             s->stream.next_in = s->inbuf;
         }
@@ -902,6 +899,18 @@ int ZEXPORT gzeof (file)
     return s->z_err == Z_STREAM_END;
 }
 
+/* ===========================================================================
+     Returns 1 if reading and doing so transparently, otherwise zero.
+*/
+int ZEXPORT gzdirect (file)
+    gzFile file;
+{
+    gz_stream *s = (gz_stream*)file;
+
+    if (s == NULL || s->mode != 'r') return 0;
+    return s->transparent;
+}
+
 /* ===========================================================================
    Outputs a long in LSB order to the given file
 */
@@ -941,7 +950,6 @@ local uLong getLong (s)
 int ZEXPORT gzclose (file)
     gzFile file;
 {
-    int err;
     gz_stream *s = (gz_stream*)file;
 
     if (s == NULL) return Z_STREAM_ERROR;
@@ -950,8 +958,8 @@ int ZEXPORT gzclose (file)
 #ifdef NO_GZCOMPRESS
         return Z_STREAM_ERROR;
 #else
-        err = do_flush (file, Z_FINISH);
-        if (err != Z_OK) return destroy((gz_stream*)file);
+        if (do_flush (file, Z_FINISH) != Z_OK)
+            return destroy((gz_stream*)file);
 
         putLong (s->file, s->crc);
         putLong (s->file, (uLong)(s->in & 0xffffffff));
@@ -960,6 +968,12 @@ int ZEXPORT gzclose (file)
     return destroy((gz_stream*)file);
 }
 
+#ifdef STDC
+#  define zstrerror(errnum) strerror(errnum)
+#else
+#  define zstrerror(errnum) ""
+#endif
+
 /* ===========================================================================
      Returns the error message for the last error which occured on the
    given compressed file. errnum is set to zlib error number. If an

infback.c

@@ -1,5 +1,5 @@
 /* infback.c -- inflate using a call-back interface
- * Copyright (C) 1995-2003 Mark Adler
+ * Copyright (C) 1995-2004 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
@@ -26,7 +26,7 @@ local void fixedtables OF((struct inflate_state FAR *state));
    window and output buffer that is 2**windowBits bytes.
  */
 int ZEXPORT inflateBackInit_(strm, windowBits, window, version, stream_size)
-z_stream FAR *strm;
+z_streamp strm;
 int windowBits;
 unsigned char FAR *window;
 const char *version;
@@ -51,6 +51,7 @@ int stream_size;
     if (state == Z_NULL) return Z_MEM_ERROR;
     Tracev((stderr, "inflate: allocated\n"));
     strm->state = (voidpf)state;
+    state->dmax = 32768U;
     state->wbits = windowBits;
     state->wsize = 1U << windowBits;
     state->window = window;
@@ -238,7 +239,7 @@ struct inflate_state FAR *state;
    are not correct, i.e. strm is Z_NULL or the state was not initialized.
  */
 int ZEXPORT inflateBack(strm, in, in_desc, out, out_desc)
-z_stream FAR *strm;
+z_streamp strm;
 in_func in;
 void FAR *in_desc;
 out_func out;
@@ -611,7 +612,7 @@ void FAR *out_desc;
 }
 
 int ZEXPORT inflateBackEnd(strm)
-z_stream FAR *strm;
+z_streamp strm;
 {
     if (strm == Z_NULL || strm->state == Z_NULL || strm->zfree == (free_func)0)
         return Z_STREAM_ERROR;

inffast.c

@@ -74,6 +74,9 @@ unsigned start;         /* inflate()'s starting value for strm->avail_out */
     unsigned char FAR *out;     /* local strm->next_out */
     unsigned char FAR *beg;     /* inflate()'s initial strm->next_out */
     unsigned char FAR *end;     /* while out < end, enough space available */
+#ifdef INFLATE_STRICT
+    unsigned dmax;              /* maximum distance from zlib header */
+#endif
     unsigned wsize;             /* window size or zero if not using window */
     unsigned whave;             /* valid bytes in the window */
     unsigned write;             /* window write index */
@@ -98,6 +101,9 @@ unsigned start;         /* inflate()'s starting value for strm->avail_out */
     out = strm->next_out - OFF;
     beg = out - (start - strm->avail_out);
     end = out + (strm->avail_out - 257);
+#ifdef INFLATE_STRICT
+    dmax = state->dmax;
+#endif
     wsize = state->wsize;
     whave = state->whave;
     write = state->write;
@@ -167,6 +173,13 @@ unsigned start;         /* inflate()'s starting value for strm->avail_out */
                     }
                 }
                 dist += (unsigned)hold & ((1U << op) - 1);
+#ifdef INFLATE_STRICT
+                if (dist > dmax) {
+                    strm->msg = (char *)"invalid distance too far back";
+                    state->mode = BAD;
+                    break;
+                }
+#endif
                 hold >>= op;
                 bits -= op;
                 Tracevv((stderr, "inflate:         distance %u\n", dist));

inflate.c

@@ -1,5 +1,5 @@
 /* inflate.c -- zlib decompression
- * Copyright (C) 1995-2003 Mark Adler
+ * Copyright (C) 1995-2005 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
@@ -113,6 +113,8 @@ z_streamp strm;
     state->mode = HEAD;
     state->last = 0;
     state->havedict = 0;
+    state->dmax = 32768U;
+    state->head = Z_NULL;
     state->wsize = 0;
     state->whave = 0;
     state->hold = 0;
@@ -582,6 +584,8 @@ int flush;
                 break;
             }
             state->flags = 0;           /* expect zlib header */
+            if (state->head != Z_NULL)
+                state->head->done = -1;
             if (!(state->wrap & 1) ||   /* check if zlib header allowed */
 #else
             if (
@@ -597,11 +601,13 @@ int flush;
                 break;
             }
             DROPBITS(4);
-            if (BITS(4) + 8 > state->wbits) {
+            len = BITS(4) + 8;
+            if (len > state->wbits) {
                 strm->msg = (char *)"invalid window size";
                 state->mode = BAD;
                 break;
             }
+            state->dmax = 1U << len;
             Tracev((stderr, "inflate:   zlib header ok\n"));
             strm->adler = state->check = adler32(0L, Z_NULL, 0);
             state->mode = hold & 0x200 ? DICTID : TYPE;
@@ -621,16 +627,24 @@ int flush;
                 state->mode = BAD;
                 break;
             }
+            if (state->head != Z_NULL)
+                state->head->text = (int)((hold >> 8) & 1);
             if (state->flags & 0x0200) CRC2(state->check, hold);
             INITBITS();
             state->mode = TIME;
         case TIME:
             NEEDBITS(32);
+            if (state->head != Z_NULL)
+                state->head->time = hold;
             if (state->flags & 0x0200) CRC4(state->check, hold);
             INITBITS();
             state->mode = OS;
         case OS:
             NEEDBITS(16);
+            if (state->head != Z_NULL) {
+                state->head->xflags = (int)(hold & 0xff);
+                state->head->os = (int)(hold >> 8);
+            }
             if (state->flags & 0x0200) CRC2(state->check, hold);
             INITBITS();
             state->mode = EXLEN;
@@ -638,15 +652,26 @@ int flush;
             if (state->flags & 0x0400) {
                 NEEDBITS(16);
                 state->length = (unsigned)(hold);
+                if (state->head != Z_NULL)
+                    state->head->extra_len = (unsigned)hold;
                 if (state->flags & 0x0200) CRC2(state->check, hold);
                 INITBITS();
             }
+            else if (state->head != Z_NULL)
+                state->head->extra = Z_NULL;
             state->mode = EXTRA;
         case EXTRA:
             if (state->flags & 0x0400) {
                 copy = state->length;
                 if (copy > have) copy = have;
                 if (copy) {
+                    if (state->head != Z_NULL &&
+                        state->head->extra != Z_NULL) {
+                        len = state->head->extra_len - state->length;
+                        zmemcpy(state->head->extra + len, next,
+                                len + copy > state->head->extra_max ?
+                                state->head->extra_max - len : copy);
+                    }
                     if (state->flags & 0x0200)
                         state->check = crc32(state->check, next, copy);
                     have -= copy;
@@ -655,6 +680,7 @@ int flush;
                 }
                 if (state->length) goto inf_leave;
             }
+            state->length = 0;
             state->mode = NAME;
         case NAME:
             if (state->flags & 0x0800) {
@@ -662,13 +688,20 @@ int flush;
                 copy = 0;
                 do {
                     len = (unsigned)(next[copy++]);
+                    if (state->head != Z_NULL &&
+                            state->head->name != Z_NULL &&
+                            state->length < state->head->name_max)
+                        state->head->name[state->length++] = len;
                 } while (len && copy < have);
-                if (state->flags & 0x02000)
+                if (state->flags & 0x0200)
                     state->check = crc32(state->check, next, copy);
                 have -= copy;
                 next += copy;
                 if (len) goto inf_leave;
             }
+            else if (state->head != Z_NULL)
+                state->head->name = Z_NULL;
+            state->length = 0;
             state->mode = COMMENT;
         case COMMENT:
             if (state->flags & 0x1000) {
@@ -676,13 +709,19 @@ int flush;
                 copy = 0;
                 do {
                     len = (unsigned)(next[copy++]);
+                    if (state->head != Z_NULL &&
+                            state->head->comment != Z_NULL &&
+                            state->length < state->head->comm_max)
+                        state->head->comment[state->length++] = len;
                 } while (len && copy < have);
-                if (state->flags & 0x02000)
+                if (state->flags & 0x0200)
                     state->check = crc32(state->check, next, copy);
                 have -= copy;
                 next += copy;
                 if (len) goto inf_leave;
             }
+            else if (state->head != Z_NULL)
+                state->head->comment = Z_NULL;
             state->mode = HCRC;
         case HCRC:
             if (state->flags & 0x0200) {
@@ -694,6 +733,10 @@ int flush;
                 }
                 INITBITS();
             }
+            if (state->head != Z_NULL) {
+                state->head->hcrc = (int)((state->flags >> 9) & 1);
+                state->head->done = 1;
+            }
             strm->adler = state->check = crc32(0L, Z_NULL, 0);
             state->mode = TYPE;
             break;
@@ -969,6 +1012,13 @@ int flush;
                 state->offset += BITS(state->extra);
                 DROPBITS(state->extra);
             }
+#ifdef INFLATE_STRICT
+            if (state->offset > state->dmax) {
+                strm->msg = (char *)"invalid distance too far back";
+                state->mode = BAD;
+                break;
+            }
+#endif
             if (state->offset > state->whave + out - left) {
                 strm->msg = (char *)"invalid distance too far back";
                 state->mode = BAD;
@@ -1110,12 +1160,16 @@ uInt dictLength;
     /* check state */
     if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
     state = (struct inflate_state FAR *)strm->state;
-    if (state->mode != DICT) return Z_STREAM_ERROR;
+    if (state->wrap != 0 && state->mode != DICT)
+        return Z_STREAM_ERROR;
 
     /* check for correct dictionary id */
-    id = adler32(0L, Z_NULL, 0);
-    id = adler32(id, dictionary, dictLength);
-    if (id != state->check) return Z_DATA_ERROR;
+    if (state->mode == DICT) {
+        id = adler32(0L, Z_NULL, 0);
+        id = adler32(id, dictionary, dictLength);
+        if (id != state->check)
+            return Z_DATA_ERROR;
+    }
 
     /* copy dictionary to window */
     if (updatewindow(strm, strm->avail_out)) {
@@ -1137,6 +1191,23 @@ uInt dictLength;
     return Z_OK;
 }
 
+int ZEXPORT inflateGetHeader(strm, head)
+z_streamp strm;
+gz_headerp head;
+{
+    struct inflate_state FAR *state;
+
+    /* check state */
+    if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
+    state = (struct inflate_state FAR *)strm->state;
+    if ((state->wrap & 2) == 0) return Z_STREAM_ERROR;
+
+    /* save header structure */
+    state->head = head;
+    head->done = 0;
+    return Z_OK;
+}
+
 /*
    Search buf[0..len-1] for the pattern: 0, 0, 0xff, 0xff.  Return when found
    or when out of input.  When called, *have is the number of pattern bytes
@@ -1261,13 +1332,17 @@ z_streamp source;
     }
 
     /* copy state */
-    *dest = *source;
-    *copy = *state;
-    copy->lencode = copy->codes + (state->lencode - state->codes);
-    copy->distcode = copy->codes + (state->distcode - state->codes);
+    zmemcpy(dest, source, sizeof(z_stream));
+    zmemcpy(copy, state, sizeof(struct inflate_state));
+    if (state->lencode >= state->codes &&
+        state->lencode <= state->codes + ENOUGH - 1)
+    {
+        copy->lencode = copy->codes + (state->lencode - state->codes);
+        copy->distcode = copy->codes + (state->distcode - state->codes);
+    }
     copy->next = copy->codes + (state->next - state->codes);
     if (window != Z_NULL)
-        zmemcpy(window, state->window, 1U << state->wbits);
+        zmemcpy(window, state->window, (uInt)(1U << state->wbits));
     copy->window = window;
     dest->state = (voidpf)copy;
     return Z_OK;

inflate.h

@@ -1,5 +1,5 @@
 /* inflate.h -- internal inflate state definition
- * Copyright (C) 1995-2003 Mark Adler
+ * Copyright (C) 1995-2004 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
@@ -19,7 +19,6 @@
 /* Possible inflate modes between inflate() calls */
 typedef enum {
     HEAD,       /* i: waiting for magic header */
-#ifdef GUNZIP
     FLAGS,      /* i: waiting for method and flags (gzip) */
     TIME,       /* i: waiting for modification time (gzip) */
     OS,         /* i: waiting for extra flags and operating system (gzip) */
@@ -28,7 +27,6 @@ typedef enum {
     NAME,       /* i: waiting for end of file name (gzip) */
     COMMENT,    /* i: waiting for end of comment (gzip) */
     HCRC,       /* i: waiting for header crc (gzip) */
-#endif
     DICTID,     /* i: waiting for dictionary check value */
     DICT,       /* waiting for inflateSetDictionary() call */
         TYPE,       /* i: waiting for type bits, including last-flag bit */
@@ -45,9 +43,7 @@ typedef enum {
             MATCH,      /* o: waiting for output space to copy string */
             LIT,        /* o: waiting for output space to write literal */
     CHECK,      /* i: waiting for 32-bit check value */
-#ifdef GUNZIP
     LENGTH,     /* i: waiting for 32-bit length (gzip) */
-#endif
     DONE,       /* finished check, done -- remain here until reset */
     BAD,        /* got a data error -- remain here until reset */
     MEM,        /* got an inflate() memory error -- remain here until reset */
@@ -84,8 +80,10 @@ struct inflate_state {
     int wrap;                   /* bit 0 true for zlib, bit 1 true for gzip */
     int havedict;               /* true if dictionary provided */
     int flags;                  /* gzip header method and flags (0 if zlib) */
+    unsigned dmax;              /* zlib header max distance (INFLATE_STRICT) */
     unsigned long check;        /* protected copy of check value */
     unsigned long total;        /* protected copy of output count */
+    gz_headerp head;            /* where to save gzip header information */
         /* sliding window */
     unsigned wbits;             /* log base 2 of requested window size */
     unsigned wsize;             /* window size or zero if not using window */

inftrees.c

@@ -1,5 +1,5 @@
 /* inftrees.c -- generate Huffman trees for efficient decoding
- * Copyright (C) 1995-2004 Mark Adler
+ * Copyright (C) 1995-2005 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
@@ -9,7 +9,7 @@
 #define MAXBITS 15
 
 const char inflate_copyright[] =
-   " inflate 1.2.2 Copyright 1995-2004 Mark Adler ";
+   " inflate 1.2.2.3 Copyright 1995-2005 Mark Adler ";
 /*
   If you use the zlib library in a product, an acknowledgment is welcome
   in the documentation of your product. If for some reason you cannot
@@ -62,7 +62,7 @@ unsigned short FAR *work;
         35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0};
     static const unsigned short lext[31] = { /* Length codes 257..285 extra */
         16, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 18, 18, 18, 18,
-        19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 16, 199, 198};
+        19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 16, 66, 71};
     static const unsigned short dbase[32] = { /* Distance codes 0..29 base */
         1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
         257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,
@@ -262,7 +262,7 @@ unsigned short FAR *work;
                 drop = root;
 
             /* increment past last table */
-            next += 1U << curr;
+            next += (unsigned)(1U << curr);
 
             /* determine length of next table */
             curr = len - drop;

make_vms.com

@@ -32,25 +32,24 @@ $   CALL MAKE adler32.OBJ "CC ''CCOPT' adler32" -
 $   CALL MAKE compress.OBJ "CC ''CCOPT' compress" -
                 compress.c zlib.h zconf.h
 $   CALL MAKE crc32.OBJ "CC ''CCOPT' crc32" -
-                crc32.c zlib.h zconf.h
+                crc32.c crc32.h zlib.h zconf.h zutil.h
 $   CALL MAKE deflate.OBJ "CC ''CCOPT' deflate" -
                 deflate.c deflate.h zutil.h zlib.h zconf.h
-$   CALL MAKE gzio.OBJ "CC ''CCOPT' gzio" -
+$   CALL MAKE gzio.OBJ "CC ''CCOPT' gzio /define=""NO_vsnprintf""" -
                 gzio.c zutil.h zlib.h zconf.h
-$   CALL MAKE infblock.OBJ "CC ''CCOPT' infblock" -
-                infblock.c zutil.h zlib.h zconf.h infblock.h
-$   CALL MAKE infcodes.OBJ "CC ''CCOPT' infcodes" -
-                infcodes.c zutil.h zlib.h zconf.h inftrees.h
+$   CALL MAKE infback.OBJ "CC ''CCOPT' infback" -
+                infback.c zutil.h zlib.h zconf.h -
+                "inftrees.h inflate.h inffast.h inffixed.h"
 $   CALL MAKE inffast.OBJ "CC ''CCOPT' inffast" -
-                inffast.c zutil.h zlib.h zconf.h inffast.h
+                inffast.c zutil.h zlib.h zconf.h -
+                "inftrees.h inflate.h inffast.h"
 $   CALL MAKE inflate.OBJ "CC ''CCOPT' inflate" -
-                inflate.c zutil.h zlib.h zconf.h infblock.h
+                inflate.c zutil.h zlib.h zconf.h -
+                "inftrees.h inflate.h inffast.h inffixed.h"
 $   CALL MAKE inftrees.OBJ "CC ''CCOPT' inftrees" -
                 inftrees.c zutil.h zlib.h zconf.h inftrees.h
-$   CALL MAKE infutil.OBJ "CC ''CCOPT' infutil" -
-                infutil.c zutil.h zlib.h zconf.h inftrees.h infutil.h
 $   CALL MAKE trees.OBJ "CC ''CCOPT' trees" -
-                trees.c deflate.h zutil.h zlib.h zconf.h
+                trees.c trees.h deflate.h zutil.h zlib.h zconf.h
 $   CALL MAKE uncompr.OBJ "CC ''CCOPT' uncompr" -
                 uncompr.c zlib.h zconf.h
 $   CALL MAKE zutil.OBJ "CC ''CCOPT' zutil" -
@@ -65,7 +64,7 @@ $   write sys$output "Building minigzip..."
 $   CALL MAKE minigzip.OBJ "CC ''CCOPT' minigzip" -
                 minigzip.c zlib.h zconf.h
 $   call make minigzip.exe -
-                "LINK minigzip,libz.olb/lib,x11vms:xvmsutils.olb/lib" -
+                "LINK minigzip,libz.olb/lib" -
                 minigzip.obj libz.olb
 $  else
 $   mms/macro=('comp')

minigzip.c

@@ -1,5 +1,5 @@
 /* minigzip.c -- simulate gzip using the zlib compression library
- * Copyright (C) 1995-2002 Jean-loup Gailly.
+ * Copyright (C) 1995-2005 Jean-loup Gailly.
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
@@ -21,8 +21,6 @@
 #ifdef STDC
 #  include <string.h>
 #  include <stdlib.h>
-#else
-   extern void exit  OF((int));
 #endif
 
 #ifdef USE_MMAP
@@ -297,6 +295,8 @@ int main(argc, argv)
         break;
       argc--, argv++;
     }
+    if (outmode[3] == ' ')
+        outmode[3] = 0;
     if (argc == 0) {
         SET_BINARY_MODE(stdin);
         SET_BINARY_MODE(stdout);

projects/README.projects

@@ -10,18 +10,21 @@ please consider submitting the project to the contrib directory.
 Requirements
 ============
 
-- The project must build zlib using exclusively the source files from
-  the official zlib distribution.
+- The project must build zlib using the source files from the official
+  zlib source distribution, exclusively.
 
-- If there are "official" makefiles in the zlib distribution, the builds
-  given by the makefiles must be compatible with the builds given by the
-  project.  These builds are called "official" builds.
+- If the project produces redistributable builds (e.g. shared objects
+  or DLL files), these builds must be compatible to those produced by
+  makefiles, if such makefiles exist in the zlib distribution.
+  In particular, if the project produces a DLL build for the Win32
+  platform, this build must comply to the officially-ammended Win32 DLL
+  Application Binary Interface (ABI), described in win32/DLL_FAQ.txt.
 
-- It is possible to add non-official pieces of code to the project,
-  if the resulting build remains compatible with an official build.
-  For example, it is possible to add an "ASM build" target besides
-  the regular target, by including ASM source files from the contrib
-  directory.
+- The project may provide additional build targets, which depend on
+  3rd-party (unofficially-supported) software, present in the contrib
+  directory.  For example, it is possible to provide an "ASM build",
+  besides the officially-supported build, and have ASM source files
+  among its dependencies.
 
 - If there are significant differences between the project files created
   by different versions of an IDE (e.g. Visual C++ 6.0 vs. 7.0), the name

projects/visualc6/README.txt

@@ -5,23 +5,6 @@ Copyright (C) 2004 Cosmin Truta.
 For conditions of distribution and use, see copyright notice in zlib.h.
 
 
-To use:
-
-1) On the main menu, select "File | Open Workspace".
-   Open "zlib.dsw".
-
-2) Select "Build | Set Active Configuration".
-   Choose the configuration you wish to build.
-
-3) Select "Build | Clean".
-
-4) Select "Build | Build ... (F7)".  Ignore warning messages about
-   not being able to find certain include files (e.g. alloc.h).
-
-5) If you built one of the sample programs (example or minigzip),
-   select "Build | Execute ... (Ctrl+F5)".
-
-
 This project builds the zlib binaries as follows:
 
 * Win32_DLL_Release\zlib1.dll       DLL build
@@ -36,3 +19,55 @@ This project builds the zlib binaries as follows:
 
 For more information regarding the DLL builds, please see the DLL FAQ
 in ..\..\win32\DLL_FAQ.txt.
+
+
+To build and test:
+
+1) On the main menu, select "File | Open Workspace".
+   Open "zlib.dsw".
+
+2) Select "Build | Set Active Configuration".
+   Choose the configuration you wish to build.
+
+3) Select "Build | Clean".
+
+4) Select "Build | Build ... (F7)".  Ignore warning messages about
+   not being able to find certain include files (e.g. alloc.h).
+
+5) If you built one of the sample programs (example or minigzip),
+   select "Build | Execute ... (Ctrl+F5)".
+
+
+To use:
+
+1) Select "Project | Settings (Alt+F7)".
+   Make note of the configuration names used in your project.
+   Usually, these names are "Win32 Release" and "Win32 Debug".
+
+2) In the Workspace window, select the "FileView" tab.
+   Right-click on the root item "Workspace '...'".
+   Select "Insert Project into Workspace".
+   Switch on the checkbox "Dependency of:", and select the name
+   of your project.  Open "zlib.dsp".
+
+3) Select "Build | Configurations".
+   For each configuration of your project:
+   3.1) Choose the zlib configuration you wish to use.
+   3.2) Click on "Add".
+   3.3) Set the new zlib configuration name to the name used by
+        the configuration from the current iteration.
+
+4) Select "Build | Set Active Configuration".
+   Choose the configuration you wish to build.
+
+5) Select "Build | Build ... (F7)".
+
+6) If you built an executable program, select
+   "Build | Execute ... (Ctrl+F5)".
+
+
+Note:
+
+To build the ASM-enabled code, you need Microsoft Assembler
+(ML.EXE).  You can get it by downloading and installing the
+latest Processor Pack for Visual C++ 6.0.

projects/visualc6/example.dsp

@@ -47,7 +47,7 @@ RSC=rc.exe
 # PROP Intermediate_Dir "Win32_DLL_Release"
 # PROP Ignore_Export_Lib 0
 # PROP Target_Dir ""
-# ADD BASE CPP /nologo /W3 /O2 /D "WIN32" /D "NDEBUG" /FD /c
+# ADD BASE CPP /nologo /MD /W3 /O2 /D "WIN32" /D "NDEBUG" /FD /c
 # SUBTRACT BASE CPP /YX
 # ADD CPP /nologo /MD /W3 /O2 /D "WIN32" /D "NDEBUG" /FD /c
 # SUBTRACT CPP /YX
@@ -58,7 +58,7 @@ BSC32=bscmake.exe
 # ADD BSC32 /nologo
 LINK32=link.exe
 # ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /machine:I386
-# ADD LINK32 zlib1.lib /nologo /subsystem:console /machine:I386 /libpath:"Win32_DLL_Release"
+# ADD LINK32 /nologo /subsystem:console /machine:I386
 
 !ELSEIF  "$(CFG)" == "example - Win32 DLL Debug"
 
@@ -73,7 +73,7 @@ LINK32=link.exe
 # PROP Intermediate_Dir "Win32_DLL_Debug"
 # PROP Ignore_Export_Lib 0
 # PROP Target_Dir ""
-# ADD BASE CPP /nologo /W3 /Gm /ZI /Od /D "WIN32" /D "_DEBUG" /FD /GZ /c
+# ADD BASE CPP /nologo /MDd /W3 /Gm /ZI /Od /D "WIN32" /D "_DEBUG" /FD /GZ /c
 # SUBTRACT BASE CPP /YX
 # ADD CPP /nologo /MDd /W3 /Gm /ZI /Od /D "WIN32" /D "_DEBUG" /FD /GZ /c
 # SUBTRACT CPP /YX
@@ -84,7 +84,7 @@ BSC32=bscmake.exe
 # ADD BSC32 /nologo
 LINK32=link.exe
 # ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
-# ADD LINK32 zlib1d.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept /libpath:"Win32_DLL_Debug"
+# ADD LINK32 /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
 
 !ELSEIF  "$(CFG)" == "example - Win32 DLL ASM Release"
 
@@ -99,7 +99,7 @@ LINK32=link.exe
 # PROP Intermediate_Dir "Win32_DLL_ASM_Release"
 # PROP Ignore_Export_Lib 0
 # PROP Target_Dir ""
-# ADD BASE CPP /nologo /W3 /O2 /D "WIN32" /D "NDEBUG" /FD /c
+# ADD BASE CPP /nologo /MD /W3 /O2 /D "WIN32" /D "NDEBUG" /FD /c
 # SUBTRACT BASE CPP /YX
 # ADD CPP /nologo /MD /W3 /O2 /D "WIN32" /D "NDEBUG" /FD /c
 # SUBTRACT CPP /YX
@@ -110,7 +110,7 @@ BSC32=bscmake.exe
 # ADD BSC32 /nologo
 LINK32=link.exe
 # ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /machine:I386
-# ADD LINK32 zlib1.lib /nologo /subsystem:console /machine:I386 /libpath:"Win32_DLL_ASM_Release"
+# ADD LINK32 /nologo /subsystem:console /machine:I386
 
 !ELSEIF  "$(CFG)" == "example - Win32 DLL ASM Debug"
 
@@ -125,7 +125,7 @@ LINK32=link.exe
 # PROP Intermediate_Dir "Win32_DLL_ASM_Debug"
 # PROP Ignore_Export_Lib 0
 # PROP Target_Dir ""
-# ADD BASE CPP /nologo /W3 /Gm /ZI /Od /D "WIN32" /D "_DEBUG" /FD /GZ /c
+# ADD BASE CPP /nologo /MDd /W3 /Gm /ZI /Od /D "WIN32" /D "_DEBUG" /FD /GZ /c
 # SUBTRACT BASE CPP /YX
 # ADD CPP /nologo /MDd /W3 /Gm /ZI /Od /D "WIN32" /D "_DEBUG" /FD /GZ /c
 # SUBTRACT CPP /YX
@@ -136,7 +136,7 @@ BSC32=bscmake.exe
 # ADD BSC32 /nologo
 LINK32=link.exe
 # ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
-# ADD LINK32 zlib1d.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept /libpath:"Win32_DLL_ASM_Debug"
+# ADD LINK32 /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
 
 !ELSEIF  "$(CFG)" == "example - Win32 LIB Release"
 
@@ -151,7 +151,7 @@ LINK32=link.exe
 # PROP Intermediate_Dir "Win32_LIB_Release"
 # PROP Ignore_Export_Lib 0
 # PROP Target_Dir ""
-# ADD BASE CPP /nologo /W3 /O2 /D "WIN32" /D "NDEBUG" /FD /c
+# ADD BASE CPP /nologo /MD /W3 /O2 /D "WIN32" /D "NDEBUG" /FD /c
 # SUBTRACT BASE CPP /YX
 # ADD CPP /nologo /MD /W3 /O2 /D "WIN32" /D "NDEBUG" /FD /c
 # SUBTRACT CPP /YX
@@ -162,7 +162,7 @@ BSC32=bscmake.exe
 # ADD BSC32 /nologo
 LINK32=link.exe
 # ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /machine:I386
-# ADD LINK32 zlib.lib /nologo /subsystem:console /machine:I386 /libpath:"Win32_LIB_Release"
+# ADD LINK32 /nologo /subsystem:console /machine:I386
 
 !ELSEIF  "$(CFG)" == "example - Win32 LIB Debug"
 
@@ -177,7 +177,7 @@ LINK32=link.exe
 # PROP Intermediate_Dir "Win32_LIB_Debug"
 # PROP Ignore_Export_Lib 0
 # PROP Target_Dir ""
-# ADD BASE CPP /nologo /W3 /Gm /ZI /Od /D "WIN32" /D "_DEBUG" /FD /GZ /c
+# ADD BASE CPP /nologo /MDd /W3 /Gm /ZI /Od /D "WIN32" /D "_DEBUG" /FD /GZ /c
 # SUBTRACT BASE CPP /YX
 # ADD CPP /nologo /MDd /W3 /Gm /ZI /Od /D "WIN32" /D "_DEBUG" /FD /GZ /c
 # SUBTRACT CPP /YX
@@ -188,7 +188,7 @@ BSC32=bscmake.exe
 # ADD BSC32 /nologo
 LINK32=link.exe
 # ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
-# ADD LINK32 zlibd.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept /libpath:"Win32_LIB_Debug"
+# ADD LINK32 /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
 
 !ELSEIF  "$(CFG)" == "example - Win32 LIB ASM Release"
 
@@ -203,7 +203,7 @@ LINK32=link.exe
 # PROP Intermediate_Dir "Win32_LIB_ASM_Release"
 # PROP Ignore_Export_Lib 0
 # PROP Target_Dir ""
-# ADD BASE CPP /nologo /W3 /O2 /D "WIN32" /D "NDEBUG" /FD /c
+# ADD BASE CPP /nologo /MD /W3 /O2 /D "WIN32" /D "NDEBUG" /FD /c
 # SUBTRACT BASE CPP /YX
 # ADD CPP /nologo /MD /W3 /O2 /D "WIN32" /D "NDEBUG" /FD /c
 # SUBTRACT CPP /YX
@@ -214,7 +214,7 @@ BSC32=bscmake.exe
 # ADD BSC32 /nologo
 LINK32=link.exe
 # ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /machine:I386
-# ADD LINK32 zlib.lib /nologo /subsystem:console /machine:I386 /libpath:"Win32_LIB_ASM_Release"
+# ADD LINK32 /nologo /subsystem:console /machine:I386
 
 !ELSEIF  "$(CFG)" == "example - Win32 LIB ASM Debug"
 
@@ -229,7 +229,7 @@ LINK32=link.exe
 # PROP Intermediate_Dir "Win32_LIB_ASM_Debug"
 # PROP Ignore_Export_Lib 0
 # PROP Target_Dir ""
-# ADD BASE CPP /nologo /W3 /Gm /ZI /Od /D "WIN32" /D "_DEBUG" /FD /GZ /c
+# ADD BASE CPP /nologo /MDd /W3 /Gm /ZI /Od /D "WIN32" /D "_DEBUG" /FD /GZ /c
 # SUBTRACT BASE CPP /YX
 # ADD CPP /nologo /MDd /W3 /Gm /ZI /Od /D "WIN32" /D "_DEBUG" /FD /GZ /c
 # SUBTRACT CPP /YX
@@ -240,7 +240,7 @@ BSC32=bscmake.exe
 # ADD BSC32 /nologo
 LINK32=link.exe
 # ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
-# ADD LINK32 zlibd.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept /libpath:"Win32_LIB_ASM_Debug"
+# ADD LINK32 /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
 
 !ENDIF 
 

projects/visualc6/minigzip.dsp

@@ -47,7 +47,7 @@ RSC=rc.exe
 # PROP Intermediate_Dir "Win32_DLL_Release"
 # PROP Ignore_Export_Lib 0
 # PROP Target_Dir ""
-# ADD BASE CPP /nologo /W3 /O2 /D "WIN32" /D "NDEBUG" /FD /c
+# ADD BASE CPP /nologo /MD /W3 /O2 /D "WIN32" /D "NDEBUG" /FD /c
 # SUBTRACT BASE CPP /YX
 # ADD CPP /nologo /MD /W3 /O2 /D "WIN32" /D "NDEBUG" /FD /c
 # SUBTRACT CPP /YX
@@ -58,7 +58,7 @@ BSC32=bscmake.exe
 # ADD BSC32 /nologo
 LINK32=link.exe
 # ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /machine:I386
-# ADD LINK32 zlib1.lib /nologo /subsystem:console /machine:I386 /libpath:"Win32_DLL_Release"
+# ADD LINK32 /nologo /subsystem:console /machine:I386
 
 !ELSEIF  "$(CFG)" == "minigzip - Win32 DLL Debug"
 
@@ -73,7 +73,7 @@ LINK32=link.exe
 # PROP Intermediate_Dir "Win32_DLL_Debug"
 # PROP Ignore_Export_Lib 0
 # PROP Target_Dir ""
-# ADD BASE CPP /nologo /W3 /Gm /ZI /Od /D "WIN32" /D "_DEBUG" /FD /GZ /c
+# ADD BASE CPP /nologo /MDd /W3 /Gm /ZI /Od /D "WIN32" /D "_DEBUG" /FD /GZ /c
 # SUBTRACT BASE CPP /YX
 # ADD CPP /nologo /MDd /W3 /Gm /ZI /Od /D "WIN32" /D "_DEBUG" /FD /GZ /c
 # SUBTRACT CPP /YX
@@ -84,7 +84,7 @@ BSC32=bscmake.exe
 # ADD BSC32 /nologo
 LINK32=link.exe
 # ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
-# ADD LINK32 zlib1d.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept /libpath:"Win32_DLL_Debug"
+# ADD LINK32 /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
 
 !ELSEIF  "$(CFG)" == "minigzip - Win32 DLL ASM Release"
 
@@ -99,7 +99,7 @@ LINK32=link.exe
 # PROP Intermediate_Dir "Win32_DLL_ASM_Release"
 # PROP Ignore_Export_Lib 0
 # PROP Target_Dir ""
-# ADD BASE CPP /nologo /W3 /O2 /D "WIN32" /D "NDEBUG" /FD /c
+# ADD BASE CPP /nologo /MD /W3 /O2 /D "WIN32" /D "NDEBUG" /FD /c
 # SUBTRACT BASE CPP /YX
 # ADD CPP /nologo /MD /W3 /O2 /D "WIN32" /D "NDEBUG" /FD /c
 # SUBTRACT CPP /YX
@@ -110,7 +110,7 @@ BSC32=bscmake.exe
 # ADD BSC32 /nologo
 LINK32=link.exe
 # ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /machine:I386
-# ADD LINK32 zlib1.lib /nologo /subsystem:console /machine:I386 /libpath:"Win32_DLL_ASM_Release"
+# ADD LINK32 /nologo /subsystem:console /machine:I386
 
 !ELSEIF  "$(CFG)" == "minigzip - Win32 DLL ASM Debug"
 
@@ -125,7 +125,7 @@ LINK32=link.exe
 # PROP Intermediate_Dir "Win32_DLL_ASM_Debug"
 # PROP Ignore_Export_Lib 0
 # PROP Target_Dir ""
-# ADD BASE CPP /nologo /W3 /Gm /ZI /Od /D "WIN32" /D "_DEBUG" /FD /GZ /c
+# ADD BASE CPP /nologo /MDd /W3 /Gm /ZI /Od /D "WIN32" /D "_DEBUG" /FD /GZ /c
 # SUBTRACT BASE CPP /YX
 # ADD CPP /nologo /MDd /W3 /Gm /ZI /Od /D "WIN32" /D "_DEBUG" /FD /GZ /c
 # SUBTRACT CPP /YX
@@ -136,7 +136,7 @@ BSC32=bscmake.exe
 # ADD BSC32 /nologo
 LINK32=link.exe
 # ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
-# ADD LINK32 zlib1d.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept /libpath:"Win32_DLL_ASM_Debug"
+# ADD LINK32 /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
 
 !ELSEIF  "$(CFG)" == "minigzip - Win32 LIB Release"
 
@@ -151,7 +151,7 @@ LINK32=link.exe
 # PROP Intermediate_Dir "Win32_LIB_Release"
 # PROP Ignore_Export_Lib 0
 # PROP Target_Dir ""
-# ADD BASE CPP /nologo /W3 /O2 /D "WIN32" /D "NDEBUG" /FD /c
+# ADD BASE CPP /nologo /MD /W3 /O2 /D "WIN32" /D "NDEBUG" /FD /c
 # SUBTRACT BASE CPP /YX
 # ADD CPP /nologo /MD /W3 /O2 /D "WIN32" /D "NDEBUG" /FD /c
 # SUBTRACT CPP /YX
@@ -162,7 +162,7 @@ BSC32=bscmake.exe
 # ADD BSC32 /nologo
 LINK32=link.exe
 # ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /machine:I386
-# ADD LINK32 zlib.lib /nologo /subsystem:console /machine:I386 /libpath:"Win32_LIB_Release"
+# ADD LINK32 /nologo /subsystem:console /machine:I386
 
 !ELSEIF  "$(CFG)" == "minigzip - Win32 LIB Debug"
 
@@ -177,7 +177,7 @@ LINK32=link.exe
 # PROP Intermediate_Dir "Win32_LIB_Debug"
 # PROP Ignore_Export_Lib 0
 # PROP Target_Dir ""
-# ADD BASE CPP /nologo /W3 /Gm /ZI /Od /D "WIN32" /D "_DEBUG" /FD /GZ /c
+# ADD BASE CPP /nologo /MDd /W3 /Gm /ZI /Od /D "WIN32" /D "_DEBUG" /FD /GZ /c
 # SUBTRACT BASE CPP /YX
 # ADD CPP /nologo /MDd /W3 /Gm /ZI /Od /D "WIN32" /D "_DEBUG" /FD /GZ /c
 # SUBTRACT CPP /YX
@@ -188,7 +188,7 @@ BSC32=bscmake.exe
 # ADD BSC32 /nologo
 LINK32=link.exe
 # ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
-# ADD LINK32 zlibd.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept /libpath:"Win32_LIB_Debug"
+# ADD LINK32 /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
 
 !ELSEIF  "$(CFG)" == "minigzip - Win32 LIB ASM Release"
 
@@ -203,7 +203,7 @@ LINK32=link.exe
 # PROP Intermediate_Dir "Win32_LIB_ASM_Release"
 # PROP Ignore_Export_Lib 0
 # PROP Target_Dir ""
-# ADD BASE CPP /nologo /W3 /O2 /D "WIN32" /D "NDEBUG" /FD /c
+# ADD BASE CPP /nologo /MD /W3 /O2 /D "WIN32" /D "NDEBUG" /FD /c
 # SUBTRACT BASE CPP /YX
 # ADD CPP /nologo /MD /W3 /O2 /D "WIN32" /D "NDEBUG" /FD /c
 # SUBTRACT CPP /YX
@@ -214,7 +214,7 @@ BSC32=bscmake.exe
 # ADD BSC32 /nologo
 LINK32=link.exe
 # ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /machine:I386
-# ADD LINK32 zlib.lib /nologo /subsystem:console /machine:I386 /libpath:"Win32_LIB_ASM_Release"
+# ADD LINK32 /nologo /subsystem:console /machine:I386
 
 !ELSEIF  "$(CFG)" == "minigzip - Win32 LIB ASM Debug"
 
@@ -229,7 +229,7 @@ LINK32=link.exe
 # PROP Intermediate_Dir "Win32_LIB_ASM_Debug"
 # PROP Ignore_Export_Lib 0
 # PROP Target_Dir ""
-# ADD BASE CPP /nologo /W3 /Gm /ZI /Od /D "WIN32" /D "_DEBUG" /FD /GZ /c
+# ADD BASE CPP /nologo /MDd /W3 /Gm /ZI /Od /D "WIN32" /D "_DEBUG" /FD /GZ /c
 # SUBTRACT BASE CPP /YX
 # ADD CPP /nologo /MDd /W3 /Gm /ZI /Od /D "WIN32" /D "_DEBUG" /FD /GZ /c
 # SUBTRACT CPP /YX
@@ -240,7 +240,7 @@ BSC32=bscmake.exe
 # ADD BSC32 /nologo
 LINK32=link.exe
 # ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
-# ADD LINK32 zlibd.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept /libpath:"Win32_LIB_ASM_Debug"
+# ADD LINK32 /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
 
 !ENDIF 
 

projects/visualc6/zlib.dsp

@@ -435,7 +435,7 @@ InputPath=..\..\contrib\masmx86\gvmat32.asm
 InputName=gvmat32
 
 "$(IntDir)\$(InputName).obj" : $(SOURCE) "$(INTDIR)" "$(OUTDIR)"
-	ml /nologo /c /Cx /coff /Zi /Fo"$(IntDir)\$(InputName).obj" "$(InputPath)"
+	ml.exe /nologo /c /coff /Cx /Fo"$(IntDir)\$(InputName).obj" "$(InputPath)"
 
 # End Custom Build
 
@@ -447,7 +447,7 @@ InputPath=..\..\contrib\masmx86\gvmat32.asm
 InputName=gvmat32
 
 "$(IntDir)\$(InputName).obj" : $(SOURCE) "$(INTDIR)" "$(OUTDIR)"
-	ml /nologo /c /Cx /coff /Zi /Fo"$(IntDir)\$(InputName).obj" "$(InputPath)"
+	ml.exe /nologo /c /coff /Cx /Zi /Fo"$(IntDir)\$(InputName).obj" "$(InputPath)"
 
 # End Custom Build
 
@@ -467,7 +467,7 @@ InputPath=..\..\contrib\masmx86\gvmat32.asm
 InputName=gvmat32
 
 "$(IntDir)\$(InputName).obj" : $(SOURCE) "$(INTDIR)" "$(OUTDIR)"
-	ml /nologo /c /Cx /coff /Zi /Fo"$(IntDir)\$(InputName).obj" "$(InputPath)"
+	ml.exe /nologo /c /coff /Cx /Fo"$(IntDir)\$(InputName).obj" "$(InputPath)"
 
 # End Custom Build
 
@@ -479,7 +479,7 @@ InputPath=..\..\contrib\masmx86\gvmat32.asm
 InputName=gvmat32
 
 "$(IntDir)\$(InputName).obj" : $(SOURCE) "$(INTDIR)" "$(OUTDIR)"
-	ml /nologo /c /Cx /coff /Zi /Fo"$(IntDir)\$(InputName).obj" "$(InputPath)"
+	ml.exe /nologo /c /coff /Cx /Zi /Fo"$(IntDir)\$(InputName).obj" "$(InputPath)"
 
 # End Custom Build
 
@@ -549,7 +549,7 @@ InputPath=..\..\contrib\masmx86\inffas32.asm
 InputName=inffas32
 
 "$(IntDir)\$(InputName).obj" : $(SOURCE) "$(INTDIR)" "$(OUTDIR)"
-	ml /nologo /c /Cx /coff /Zi /Fo"$(IntDir)\$(InputName).obj" "$(InputPath)"
+	ml.exe /nologo /c /coff /Cx /Fo"$(IntDir)\$(InputName).obj" "$(InputPath)"
 
 # End Custom Build
 
@@ -561,7 +561,7 @@ InputPath=..\..\contrib\masmx86\inffas32.asm
 InputName=inffas32
 
 "$(IntDir)\$(InputName).obj" : $(SOURCE) "$(INTDIR)" "$(OUTDIR)"
-	ml /nologo /c /Cx /coff /Zi /Fo"$(IntDir)\$(InputName).obj" "$(InputPath)"
+	ml.exe /nologo /c /coff /Cx /Zi /Fo"$(IntDir)\$(InputName).obj" "$(InputPath)"
 
 # End Custom Build
 
@@ -581,7 +581,7 @@ InputPath=..\..\contrib\masmx86\inffas32.asm
 InputName=inffas32
 
 "$(IntDir)\$(InputName).obj" : $(SOURCE) "$(INTDIR)" "$(OUTDIR)"
-	ml /nologo /c /Cx /coff /Zi /Fo"$(IntDir)\$(InputName).obj" "$(InputPath)"
+	ml.exe /nologo /c /coff /Cx /Fo"$(IntDir)\$(InputName).obj" "$(InputPath)"
 
 # End Custom Build
 
@@ -593,7 +593,7 @@ InputPath=..\..\contrib\masmx86\inffas32.asm
 InputName=inffas32
 
 "$(IntDir)\$(InputName).obj" : $(SOURCE) "$(INTDIR)" "$(OUTDIR)"
-	ml /nologo /c /Cx /coff /Zi /Fo"$(IntDir)\$(InputName).obj" "$(InputPath)"
+	ml.exe /nologo /c /coff /Cx /Zi /Fo"$(IntDir)\$(InputName).obj" "$(InputPath)"
 
 # End Custom Build
 

qnx/package.qpg

@@ -25,10 +25,10 @@
       <QPG:Files>
          <QPG:Add file="../zconf.h" install="/opt/include/" user="root:sys" permission="644"/>
          <QPG:Add file="../zlib.h" install="/opt/include/" user="root:sys" permission="644"/>
-         <QPG:Add file="../libz.so.1.2.2" install="/opt/lib/" user="root:bin" permission="644"/>
-         <QPG:Add file="libz.so" install="/opt/lib/" component="dev" filetype="symlink" linkto="libz.so.1.2.2"/>
-         <QPG:Add file="libz.so.1" install="/opt/lib/" filetype="symlink" linkto="libz.so.1.2.2"/>
-         <QPG:Add file="../libz.so.1.2.2" install="/opt/lib/" component="slib"/>
+         <QPG:Add file="../libz.so.1.2.2.3" install="/opt/lib/" user="root:bin" permission="644"/>
+         <QPG:Add file="libz.so" install="/opt/lib/" component="dev" filetype="symlink" linkto="libz.so.1.2.2.3"/>
+         <QPG:Add file="libz.so.1" install="/opt/lib/" filetype="symlink" linkto="libz.so.1.2.2.3"/>
+         <QPG:Add file="../libz.so.1.2.2.3" install="/opt/lib/" component="slib"/>
       </QPG:Files>
 
       <QPG:PackageFilter>
@@ -63,7 +63,7 @@
             </QPM:ProductDescription>
 
             <QPM:ReleaseDescription>
-               <QPM:ReleaseVersion>1.2.2</QPM:ReleaseVersion>
+               <QPM:ReleaseVersion>1.2.2.3</QPM:ReleaseVersion>
                <QPM:ReleaseUrgency>Medium</QPM:ReleaseUrgency>
                <QPM:ReleaseStability>Stable</QPM:ReleaseStability>
                <QPM:ReleaseNoteMinor></QPM:ReleaseNoteMinor>

trees.c

@@ -1,5 +1,5 @@
 /* trees.c -- output deflated data using Huffman coding
- * Copyright (C) 1995-2003 Jean-loup Gailly
+ * Copyright (C) 1995-2004 Jean-loup Gailly
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
@@ -930,8 +930,9 @@ void _tr_flush_block(s, buf, stored_len, eof)
     /* Build the Huffman trees unless a stored block is forced */
     if (s->level > 0) {
 
-         /* Check if the file is ascii or binary */
-        if (s->strm->data_type == Z_UNKNOWN) set_data_type(s);
+        /* Check if the file is binary or text */
+        if (stored_len > 0 && s->strm->data_type == Z_UNKNOWN)
+            set_data_type(s);
 
         /* Construct the literal and distance trees */
         build_tree(s, (tree_desc *)(&(s->l_desc)));
@@ -982,7 +983,7 @@ void _tr_flush_block(s, buf, stored_len, eof)
 #ifdef FORCE_STATIC
     } else if (static_lenb >= 0) { /* force static trees */
 #else
-    } else if (static_lenb == opt_lenb) {
+    } else if (s->strategy == Z_FIXED || static_lenb == opt_lenb) {
 #endif
         send_bits(s, (STATIC_TREES<<1)+eof, 3);
         compress_block(s, (ct_data *)static_ltree, (ct_data *)static_dtree);
@@ -1117,21 +1118,24 @@ local void compress_block(s, ltree, dtree)
 }
 
 /* ===========================================================================
- * Set the data type to ASCII or BINARY, using a crude approximation:
- * binary if more than 20% of the bytes are <= 6 or >= 128, ascii otherwise.
- * IN assertion: the fields freq of dyn_ltree are set and the total of all
- * frequencies does not exceed 64K (to fit in an int on 16 bit machines).
+ * Set the data type to BINARY or TEXT, using a crude approximation:
+ * set it to Z_TEXT if all symbols are either printable characters (33 to 255)
+ * or white spaces (9 to 13, or 32); or set it to Z_BINARY otherwise.
+ * IN assertion: the fields Freq of dyn_ltree are set.
  */
 local void set_data_type(s)
     deflate_state *s;
 {
-    int n = 0;
-    unsigned ascii_freq = 0;
-    unsigned bin_freq = 0;
-    while (n < 7)        bin_freq += s->dyn_ltree[n++].Freq;
-    while (n < 128)    ascii_freq += s->dyn_ltree[n++].Freq;
-    while (n < LITERALS) bin_freq += s->dyn_ltree[n++].Freq;
-    s->strm->data_type = bin_freq > (ascii_freq >> 2) ? Z_BINARY : Z_ASCII;
+    int n;
+
+    for (n = 0; n < 9; n++)
+        if (s->dyn_ltree[n].Freq != 0)
+            break;
+    if (n == 9)
+        for (n = 14; n < 32; n++)
+            if (s->dyn_ltree[n].Freq != 0)
+                break;
+    s->strm->data_type = (n == 32) ? Z_TEXT : Z_BINARY;
 }
 
 /* ===========================================================================

win32/DLL_FAQ.txt

@@ -175,7 +175,7 @@ in the zlib distribution, or at the following location:
     zlib in other programming languages.  Some of them, like Ada
     (GNAT) and Fortran (GNU G77), have C bindings implemented
     initially on Unix, and relying on the C calling convention.
-    On the other hand, the pre- .Net versions of Microsoft Visual
+    On the other hand, the pre- .NET versions of Microsoft Visual
     Basic require STDCALL, while Borland Delphi prefers, although
     it does not require, FASTCALL.
 
@@ -203,10 +203,10 @@ in the zlib distribution, or at the following location:
     zlib distribution.
 
 
- 8. I need to use zlib in my Microsoft .Net project.  What can I
+ 8. I need to use zlib in my Microsoft .NET project.  What can I
     do?
 
-  - Henrik Ravn has contributed a .Net wrapper around zlib.  Look
+  - Henrik Ravn has contributed a .NET wrapper around zlib.  Look
     into contrib/dotzlib/, inside the zlib distribution.
 
 
@@ -225,8 +225,8 @@ in the zlib distribution, or at the following location:
     depend on it should also be linked to MSVCRT.DLL.
 
 
-10. Why are you saying that ZLIB1.DLL and my application must be
-    linked to the same C run-time (CRT) library?  I linked my
+10. Why are you saying that ZLIB1.DLL and my application should
+    be linked to the same C run-time (CRT) library?  I linked my
     application and my DLLs to different C libraries (e.g. my
     application to a static library, and my DLLs to MSVCRT.DLL),
     and everything works fine.
@@ -277,12 +277,6 @@ in the zlib distribution, or at the following location:
     even run on it.  Furthermore, no serious user should run
     Windows 95 without a proper update installed.
 
-    There is also the fact that the mainstream C compilers for
-    Windows are Microsoft Visual C++ 6.0, and gcc/MinGW.  Both
-    are producing executables that link to MSVCRT.DLL by default,
-    without offering other dynamic CRTs as alternatives easy to
-    select by users.
-
 
 12. Why are you not linking ZLIB1.DLL to
     <<my favorite C run-time library>> ?
@@ -295,27 +289,60 @@ in the zlib distribution, or at the following location:
       to a static C library, you may as well consider linking zlib
       in statically, too.
 
-    * Linking ZLIB1.DLL to CRTDLL.DLL looks very appealing,
-      because CRTDLL.DLL is present on every Win32 installation.
-      Unfortunately, it has a series of problems: it raises
-      difficulties when using it with C++ code, it does not work
-      with 64-bit file offsets, (and so on...), and Microsoft
-      discontinued its support a long time ago.
+    * Linking ZLIB1.DLL to CRTDLL.DLL looks appealing, because
+      CRTDLL.DLL is present on every Win32 installation.
+      Unfortunately, it has a series of problems: it does not
+      work properly with Microsoft's C++ libraries, it does not
+      provide support for 64-bit file offsets, (and so on...),
+      and Microsoft discontinued its support a long time ago.
 
-    * Linking ZLIB1.DLL to MSVCR70.DLL, supplied with the
-      Microsoft .NET platform and Visual C++ 7.0 or newer, is not
-      a good option.  Although it is available for free download
-      and distribution, its presence is scarce on today's Win32
-      installations.  If it will ever become more popular than
-      MSVCRT.DLL and will be pre-installed on the future Win32
-      systems, we will probably think again about it.
+    * Linking ZLIB1.DLL to MSVCR70.DLL or MSVCR71.DLL, supplied
+      with the Microsoft .NET platform, and Visual C++ 7.0/7.1,
+      raises problems related to the status of ZLIB1.DLL as a
+      system component.  According to the Microsoft Knowledge Base
+      article KB326922 "INFO: Redistribution of the Shared C
+      Runtime Component in Visual C++ .NET", MSVCR70.DLL and
+      MSVCR71.DLL are not supposed to function as system DLLs,
+      because they may clash with MSVCRT.DLL.  Instead, the
+      application's installer is supposed to put these DLLs
+      (if needed) in the application's private directory.
+      If ZLIB1.DLL depends on a non-system runtime, it cannot
+      function as a redistributable system component.
 
-    * Linking ZLIB1.DLL to NTDLL.DLL is not possible.
-      NTDLL.DLL exports only a part of the C library, and only on
-      Windows NT systems.
+    * Linking ZLIB1.DLL to non-Microsoft runtimes, such as
+      Borland's, or Cygwin's, raises problems related to the
+      reliable presence of these runtimes on Win32 systems.
+      It's easier to let the DLL build of zlib up to the people
+      who distribute these runtimes, and who may proceed as
+      explained in the answer to Question 14.
 
 
-13. I need to link my own DLL build to a CRT different than
+13. If ZLIB1.DLL cannot be linked to MSVCR70.DLL or MSVCR71.DLL,
+    how can I build/use ZLIB1.DLL in Microsoft Visual C++ 7.0
+    (Visual Studio .NET) or newer?
+
+  - Due to the problems explained in the Microsoft Knowledge Base
+    article KB326922 (see the previous answer), the C runtime that
+    comes with the VC7 environment is no longer considered a
+    system component.  That is, it should not be assumed that this
+    runtime exists, or may be installed in a system directory.
+    Since ZLIB1.DLL is supposed to be a system component, it may
+    not depend on a non-system component.
+
+    In order to link ZLIB1.DLL and your application to MSVCRT.DLL
+    in VC7, you need the library of Visual C++ 6.0 or older.  If
+    you don't have this library at hand, it's probably best not to
+    use ZLIB1.DLL.
+
+    We are hoping that, in the future, Microsoft will provide a
+    way to build applications linked to a proper system runtime,
+    from the Visual C++ environment.  Until then, you have a
+    couple of alternatives, such as linking zlib in statically.
+    If your application requires dynamic linking, you may proceed
+    as explained in the answer to Question 14.
+
+
+14. I need to link my own DLL build to a CRT different than
     MSVCRT.DLL.  What can I do?
 
   - Feel free to rebuild the DLL from the zlib sources, and link
@@ -331,7 +358,7 @@ in the zlib distribution, or at the following location:
     CYGWIN1.DLL, and it is distributed under the name CYGZ.DLL.
 
 
-14. May I include additional pieces of code that I find useful,
+15. May I include additional pieces of code that I find useful,
     link them in ZLIB1.DLL, and export them?
 
   - No.  A legitimate build of ZLIB1.DLL must not include code
@@ -344,7 +371,7 @@ in the zlib distribution, or at the following location:
     is a redistributable file, named VCLxx.DLL.
 
 
-15. May I remove some functionality out of ZLIB1.DLL, by enabling
+16. May I remove some functionality out of ZLIB1.DLL, by enabling
     macros like NO_GZCOMPRESS or NO_GZIP at compile time?
 
   - No.  A legitimate build of ZLIB1.DLL must provide the complete
@@ -353,7 +380,7 @@ in the zlib distribution, or at the following location:
     different file name, as suggested in the previous answer.
 
 
-16. I made my own ZLIB1.DLL build.  Can I test it for compliance?
+17. I made my own ZLIB1.DLL build.  Can I test it for compliance?
 
   - We prefer that you download the official DLL from the zlib
     web site.  If you need something peculiar from this DLL, you

win32/zlib1.rc

@@ -5,8 +5,8 @@ VS_VERSION_INFO		VERSIONINFO
 #else
 VS_VERSION_INFO		VERSIONINFO	MOVEABLE IMPURE LOADONCALL DISCARDABLE
 #endif
-  FILEVERSION		1,2,2
-  PRODUCTVERSION	1,2,2
+  FILEVERSION		1,2,2,3
+  PRODUCTVERSION	1,2,2,3
   FILEFLAGSMASK		VS_FFI_FILEFLAGSMASK
 #ifdef _DEBUG
   FILEFLAGS		1
@@ -23,12 +23,12 @@ BEGIN
     //language ID = U.S. English, char set = Windows, Multilingual
     BEGIN
       VALUE "FileDescription",	"zlib data compression library\0"
-      VALUE "FileVersion",	"1.2.2\0"
+      VALUE "FileVersion",	"1.2.2.3\0"
       VALUE "InternalName",	"zlib1.dll\0"
       VALUE "LegalCopyright",	"(C) 1995-2004 Jean-loup Gailly & Mark Adler\0"
       VALUE "OriginalFilename",	"zlib1.dll\0"
       VALUE "ProductName",	"zlib\0"
-      VALUE "ProductVersion",	"1.2.2\0"
+      VALUE "ProductVersion",	"1.2.2.3\0"
       VALUE "Comments","DLL support by Alessandro Iacopetti & Gilles Vollant\0"
     END
   END

zconf.h

@@ -1,5 +1,5 @@
 /* zconf.h -- configuration of the zlib compression library
- * Copyright (C) 1995-2004 Jean-loup Gailly.
+ * Copyright (C) 1995-2005 Jean-loup Gailly.
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
@@ -43,6 +43,10 @@
 #  define get_crc_table         z_get_crc_table
 #  define zError                z_zError
 
+#  define alloc_func            z_alloc_func
+#  define free_func             z_free_func
+#  define in_func               z_in_func
+#  define out_func              z_out_func
 #  define Byte                  z_Byte
 #  define uInt                  z_uInt
 #  define uLong                 z_uLong
@@ -64,8 +68,10 @@
 #if defined(_WINDOWS) && !defined(WINDOWS)
 #  define WINDOWS
 #endif
-#if (defined(_WIN32) || defined(__WIN32__)) && !defined(WIN32)
-#  define WIN32
+#if defined(_WIN32) || defined(_WIN32_WCE) || defined(__WIN32__)
+#  ifndef WIN32
+#    define WIN32
+#  endif
 #endif
 #if (defined(MSDOS) || defined(OS2) || defined(WINDOWS)) && !defined(WIN32)
 #  if !defined(__GNUC__) && !defined(__FLAT__) && !defined(__386__)

zconf.in.h

@@ -1,5 +1,5 @@
 /* zconf.h -- configuration of the zlib compression library
- * Copyright (C) 1995-2004 Jean-loup Gailly.
+ * Copyright (C) 1995-2005 Jean-loup Gailly.
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
@@ -43,6 +43,10 @@
 #  define get_crc_table         z_get_crc_table
 #  define zError                z_zError
 
+#  define alloc_func            z_alloc_func
+#  define free_func             z_free_func
+#  define in_func               z_in_func
+#  define out_func              z_out_func
 #  define Byte                  z_Byte
 #  define uInt                  z_uInt
 #  define uLong                 z_uLong
@@ -64,8 +68,10 @@
 #if defined(_WINDOWS) && !defined(WINDOWS)
 #  define WINDOWS
 #endif
-#if (defined(_WIN32) || defined(__WIN32__)) && !defined(WIN32)
-#  define WIN32
+#if defined(_WIN32) || defined(_WIN32_WCE) || defined(__WIN32__)
+#  ifndef WIN32
+#    define WIN32
+#  endif
 #endif
 #if (defined(MSDOS) || defined(OS2) || defined(WINDOWS)) && !defined(WIN32)
 #  if !defined(__GNUC__) && !defined(__FLAT__) && !defined(__386__)

zlib.3

@@ -1,4 +1,4 @@
-.TH ZLIB 3 "3 October 2004"
+.TH ZLIB 3 "27 May 2005"
 .SH NAME
 zlib \- compression/decompression library
 .SH SYNOPSIS
@@ -133,7 +133,7 @@ before asking for help.
 Send questions and/or comments to zlib@gzip.org,
 or (for the Windows DLL version) to Gilles Vollant (info@winimage.com).
 .SH AUTHORS
-Version 1.2.2
+Version 1.2.2.3
 Copyright (C) 1995-2004 Jean-loup Gailly (jloup@gzip.org)
 and Mark Adler (madler@alumni.caltech.edu).
 .LP

zlib.h

@@ -1,7 +1,7 @@
 /* zlib.h -- interface of the 'zlib' general purpose compression library
-  version 1.2.2, October 3rd, 2004
+  version 1.2.2.3, May 27th, 2005
 
-  Copyright (C) 1995-2004 Jean-loup Gailly and Mark Adler
+  Copyright (C) 1995-2005 Jean-loup Gailly and Mark Adler
 
   This software is provided 'as-is', without any express or implied
   warranty.  In no event will the authors be held liable for any damages
@@ -37,8 +37,8 @@
 extern "C" {
 #endif
 
-#define ZLIB_VERSION "1.2.2"
-#define ZLIB_VERNUM 0x1220
+#define ZLIB_VERSION "1.2.2.3"
+#define ZLIB_VERNUM 0x1223
 
 /*
      The 'zlib' compression library provides in-memory compression and
@@ -95,13 +95,36 @@ typedef struct z_stream_s {
     free_func  zfree;   /* used to free the internal state */
     voidpf     opaque;  /* private data object passed to zalloc and zfree */
 
-    int     data_type;  /* best guess about the data type: ascii or binary */
+    int     data_type;  /* best guess about the data type: binary or text */
     uLong   adler;      /* adler32 value of the uncompressed data */
     uLong   reserved;   /* reserved for future use */
 } z_stream;
 
 typedef z_stream FAR *z_streamp;
 
+/*
+     gzip header information passed to and from zlib routines.  See RFC 1952
+  for more details on the meanings of these fields.
+*/
+typedef struct gz_header_s {
+    int     text;       /* true if compressed data believed to be text */
+    uLong   time;       /* modification time */
+    int     xflags;     /* extra flags (not used when writing a gzip file) */
+    int     os;         /* operating system */
+    Bytef   *extra;     /* pointer to extra field or Z_NULL if none */
+    uInt    extra_len;  /* extra field length (valid if extra != Z_NULL) */
+    uInt    extra_max;  /* space at extra (only when reading header) */
+    Bytef   *name;      /* pointer to zero-terminated file name or Z_NULL */
+    uInt    name_max;   /* space at name (only when reading header) */
+    Bytef   *comment;   /* pointer to zero-terminated comment or Z_NULL */
+    uInt    comm_max;   /* space at comment (only when reading header) */
+    int     hcrc;       /* true if there was or will be a header crc */
+    int     done;       /* true when done reading gzip header (not used
+                           when writing a gzip file) */
+} gz_header;
+
+typedef gz_header FAR *gz_headerp;
+
 /*
    The application must update next_in and avail_in when avail_in has
    dropped to zero. It must update next_out and avail_out when avail_out
@@ -166,11 +189,13 @@ typedef z_stream FAR *z_streamp;
 #define Z_FILTERED            1
 #define Z_HUFFMAN_ONLY        2
 #define Z_RLE                 3
+#define Z_FIXED               4
 #define Z_DEFAULT_STRATEGY    0
 /* compression strategy; see deflateInit2() below for details */
 
 #define Z_BINARY   0
-#define Z_ASCII    1
+#define Z_TEXT     1
+#define Z_ASCII    Z_TEXT   /* for compatibility with 1.2.2 and earlier */
 #define Z_UNKNOWN  2
 /* Possible values of the data_type field (though see inflate()) */
 
@@ -244,6 +269,10 @@ ZEXTERN int ZEXPORT deflate OF((z_streamp strm, int flush));
   and with zero avail_out, it must be called again after making room in the
   output buffer because there might be more output pending.
 
+    Normally the parameter flush is set to Z_NO_FLUSH, which allows deflate to
+  decide how much data to accumualte before producing output, in order to
+  maximize compression.
+
     If the parameter flush is set to Z_SYNC_FLUSH, all pending output is
   flushed to the output buffer and the output is aligned on a byte boundary, so
   that the decompressor can get all input data available so far. (In particular
@@ -255,7 +284,7 @@ ZEXTERN int ZEXPORT deflate OF((z_streamp strm, int flush));
   Z_SYNC_FLUSH, and the compression state is reset so that decompression can
   restart from this point if previous compressed data has been damaged or if
   random access is desired. Using Z_FULL_FLUSH too often can seriously degrade
-  the compression.
+  compression.
 
     If deflate returns with avail_out == 0, this function must be called again
   with the same value of the flush parameter and more output space (updated
@@ -280,8 +309,8 @@ ZEXTERN int ZEXPORT deflate OF((z_streamp strm, int flush));
     deflate() sets strm->adler to the adler32 checksum of all input read
   so far (that is, total_in bytes).
 
-    deflate() may update data_type if it can make a good guess about
-  the input data type (Z_ASCII or Z_BINARY). In doubt, the data is considered
+    deflate() may update strm->data_type if it can make a good guess about
+  the input data type (Z_BINARY or Z_TEXT). In doubt, the data is considered
   binary. This field is only for information purposes and does not affect
   the compression algorithm in any manner.
 
@@ -363,11 +392,11 @@ ZEXTERN int ZEXPORT inflate OF((z_streamp strm, int flush));
     The flush parameter of inflate() can be Z_NO_FLUSH, Z_SYNC_FLUSH,
   Z_FINISH, or Z_BLOCK. Z_SYNC_FLUSH requests that inflate() flush as much
   output as possible to the output buffer. Z_BLOCK requests that inflate() stop
-  if and when it get to the next deflate block boundary. When decoding the zlib
-  or gzip format, this will cause inflate() to return immediately after the
-  header and before the first block. When doing a raw inflate, inflate() will
-  go ahead and process the first block, and will return when it gets to the end
-  of that block, or when it runs out of data.
+  if and when it gets to the next deflate block boundary. When decoding the
+  zlib or gzip format, this will cause inflate() to return immediately after
+  the header and before the first block. When doing a raw inflate, inflate()
+  will go ahead and process the first block, and will return when it gets to
+  the end of that block, or when it runs out of data.
 
     The Z_BLOCK option assists in appending to or combining deflate streams.
   Also to assist in this, on return inflate() will set strm->data_type to the
@@ -496,7 +525,9 @@ ZEXTERN int ZEXPORT deflateInit2 OF((z_streamp strm,
    Z_DEFAULT and Z_HUFFMAN_ONLY. Z_RLE is designed to be almost as fast as
    Z_HUFFMAN_ONLY, but give better compression for PNG image data. The strategy
    parameter only affects the compression ratio but not the correctness of the
-   compressed output even if it is not set appropriately.
+   compressed output even if it is not set appropriately.  Z_FIXED prevents the
+   use of dynamic Huffman codes, allowing for a simpler decoder for special
+   applications.
 
       deflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
    memory, Z_STREAM_ERROR if a parameter is invalid (such as an invalid
@@ -525,7 +556,9 @@ ZEXTERN int ZEXPORT deflateSetDictionary OF((z_streamp strm,
    deflateInit or deflateInit2, a part of the dictionary may in effect be
    discarded, for example if the dictionary is larger than the window size in
    deflate or deflate2. Thus the strings most likely to be useful should be
-   put at the end of the dictionary, not at the front.
+   put at the end of the dictionary, not at the front. In addition, the
+   current implementation of deflate will use at most the window size minus
+   262 bytes of the provided dictionary.
 
      Upon return of this function, strm->adler is set to the adler32 value
    of the dictionary; the decompressor may later use this value to determine
@@ -591,6 +624,23 @@ ZEXTERN int ZEXPORT deflateParams OF((z_streamp strm,
    if strm->avail_out was zero.
 */
 
+ZEXTERN int ZEXPORT deflateTune OF((z_streamp strm,
+                                    int good_length,
+                                    int max_lazy,
+                                    int nice_length,
+                                    int max_chain));
+/*
+     Fine tune deflate's internal compression parameters.  This should only be
+   used by someone who understands the algorithm used by zlib's deflate for
+   searching for the best matching string, and even then only by the most
+   fanatic optimizer trying to squeeze out the last compressed bit for their
+   specific input data.  Read the deflate.c source code for the meaning of the
+   max_lazy, good_length, nice_length, and max_chain parameters.
+
+     deflateTune() can be called after deflateInit() or deflateInit2(), and
+   returns Z_OK on success, or Z_STREAM_ERROR for an invalid deflate stream.
+ */
+
 ZEXTERN uLong ZEXPORT deflateBound OF((z_streamp strm,
                                        uLong sourceLen));
 /*
@@ -616,6 +666,30 @@ ZEXTERN int ZEXPORT deflatePrime OF((z_streamp strm,
    stream state was inconsistent.
 */
 
+ZEXTERN int ZEXPORT deflateSetHeader OF((z_streamp strm,
+                                         gz_headerp head));
+/*
+      deflateSetHeader() provides gzip header information for when a gzip
+   stream is requested by deflateInit2().  deflateSetHeader() may be called
+   after deflateInit2() or deflateReset() and before the first call of
+   deflate().  The text, time, os, extra field, name, and comment information
+   in the provided gz_header structure are written to the gzip header (xflag is
+   ignored -- the extra flags are set according to the compression level).  The
+   caller must assure that, if not Z_NULL, name and comment are terminated with
+   a zero byte, and that if extra is not Z_NULL, that extra_len bytes are
+   available there.  If hcrc is true, a gzip header crc is included.  Note that
+   the current versions of the command-line version of gzip (up through version
+   1.3.x) do not support header crc's, and will report that it is a "multi-part
+   gzip file" and give up.
+
+      If deflateSetHeader is not used, the default gzip header has text false,
+   the time set to zero, and os set to 255, with no extra, name, or comment
+   fields.  The gzip header is returned to the default state by deflateReset().
+
+      deflateSetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source
+   stream state was inconsistent.
+*/
+
 /*
 ZEXTERN int ZEXPORT inflateInit2 OF((z_streamp strm,
                                      int  windowBits));
@@ -648,7 +722,7 @@ ZEXTERN int ZEXPORT inflateInit2 OF((z_streamp strm,
      windowBits can also be greater than 15 for optional gzip decoding. Add
    32 to windowBits to enable zlib and gzip decoding with automatic header
    detection, or add 16 to decode only the gzip format (the zlib format will
-   return a Z_DATA_ERROR.  If a gzip stream is being decoded, strm->adler is
+   return a Z_DATA_ERROR).  If a gzip stream is being decoded, strm->adler is
    a crc32 instead of an adler32.
 
      inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
@@ -664,11 +738,14 @@ ZEXTERN int ZEXPORT inflateSetDictionary OF((z_streamp strm,
                                              uInt  dictLength));
 /*
      Initializes the decompression dictionary from the given uncompressed byte
-   sequence. This function must be called immediately after a call of inflate
-   if this call returned Z_NEED_DICT. The dictionary chosen by the compressor
-   can be determined from the adler32 value returned by this call of
-   inflate. The compressor and decompressor must use exactly the same
-   dictionary (see deflateSetDictionary).
+   sequence. This function must be called immediately after a call of inflate,
+   if that call returned Z_NEED_DICT. The dictionary chosen by the compressor
+   can be determined from the adler32 value returned by that call of inflate.
+   The compressor and decompressor must use exactly the same dictionary (see
+   deflateSetDictionary).  For raw inflate, this function can be called
+   immediately after inflateInit2() or inflateReset() and before any call of
+   inflate() to set the dictionary.  The application must insure that the
+   dictionary that was used for compression is provided.
 
      inflateSetDictionary returns Z_OK if success, Z_STREAM_ERROR if a
    parameter is invalid (such as NULL dictionary) or the stream state is
@@ -719,8 +796,48 @@ ZEXTERN int ZEXPORT inflateReset OF((z_streamp strm));
    stream state was inconsistent (such as zalloc or state being NULL).
 */
 
+ZEXTERN int ZEXPORT inflateGetHeader OF((z_streamp strm,
+                                         gz_headerp head));
 /*
-ZEXTERN int ZEXPORT inflateBackInit OF((z_stream FAR *strm, int windowBits,
+      inflateGetHeader() requests that gzip header information be stored in the
+   provided gz_header structure.  inflateGetHeader() may be called after
+   inflateInit2() or inflateReset(), and before the first call of inflate().
+   As inflate() processes the gzip stream, head->done is zero until the header
+   is completed, at which time head->done is set to one.  If a zlib stream is
+   being decoded, then head->done is set to -1 to indicate that there will be
+   no gzip header information forthcoming.  Note that Z_BLOCK can be used to
+   force inflate() to return immediately after header processing is complete
+   and before any actual data is decompressed.
+
+      The text, time, xflags, and os fields are filled in with the gzip header
+   contents.  hcrc is set to true if there is a header CRC.  (The header CRC
+   was valid if done is set to one.)  If extra is not Z_NULL, then extra_max
+   contains the maximum number of bytes to write to extra.  Once done is true,
+   extra_len contains the actual extra field length, and extra contains the
+   extra field, or that field truncated if extra_max is less than extra_len.
+   If name is not Z_NULL, then up to name_max characters are written there,
+   terminated with a zero unless the length is greater than name_max.  If
+   comment is not Z_NULL, then up to comm_max characters are written there,
+   terminated with a zero unless the length is greater than comm_max.  When
+   any of extra, name, or comment are not Z_NULL and the respective field is
+   not present in the header, then that field is set to Z_NULL to signal its
+   absence.  This allows the use of deflateSetHeader() with the returned
+   structure to duplicate the header.  However if those fields are set to
+   allocated memory, then the application will need to save those pointers
+   elsewhere so that they can be eventually freed.
+
+      If inflateGetHeader is not used, then the header information is simply
+   discarded.  The header is always checked for validity, including the header
+   CRC if present.  inflateReset() will reset the process to discard the header
+   information.  The application would need to call inflateGetHeader() again to
+   retrieve the header from the next gzip stream.
+
+      inflateGetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source
+   stream state was inconsistent.
+*/
+
+/*
+ZEXTERN int ZEXPORT inflateBackInit OF((z_streamp strm, int windowBits,
                                         unsigned char FAR *window));
 
      Initialize the internal stream state for decompression using inflateBack()
@@ -744,7 +861,7 @@ ZEXTERN int ZEXPORT inflateBackInit OF((z_stream FAR *strm, int windowBits,
 typedef unsigned (*in_func) OF((void FAR *, unsigned char FAR * FAR *));
 typedef int (*out_func) OF((void FAR *, unsigned char FAR *, unsigned));
 
-ZEXTERN int ZEXPORT inflateBack OF((z_stream FAR *strm,
+ZEXTERN int ZEXPORT inflateBack OF((z_streamp strm,
                                     in_func in, void FAR *in_desc,
                                     out_func out, void FAR *out_desc));
 /*
@@ -813,7 +930,7 @@ ZEXTERN int ZEXPORT inflateBack OF((z_stream FAR *strm,
    that inflateBack() cannot return Z_OK.
 */
 
-ZEXTERN int ZEXPORT inflateBackEnd OF((z_stream FAR *strm));
+ZEXTERN int ZEXPORT inflateBackEnd OF((z_streamp strm));
 /*
      All memory allocated by inflateBackInit() is freed.
 
@@ -1087,6 +1204,12 @@ ZEXTERN int ZEXPORT gzeof OF((gzFile file));
    input stream, otherwise zero.
 */
 
+ZEXTERN int ZEXPORT gzdirect OF((gzFile file));
+/*
+     Returns 1 if file is being read directly without decompression, otherwise
+   zero.
+*/
+
 ZEXTERN int ZEXPORT    gzclose OF((gzFile file));
 /*
      Flushes all pending output if necessary, closes the compressed file
@@ -1119,7 +1242,6 @@ ZEXTERN void ZEXPORT gzclearerr OF((gzFile file));
 */
 
 ZEXTERN uLong ZEXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len));
-
 /*
      Update a running Adler-32 checksum with the bytes buf[0..len-1] and
    return the updated checksum. If buf is NULL, this function returns
@@ -1135,12 +1257,21 @@ ZEXTERN uLong ZEXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len));
      if (adler != original_adler) error();
 */
 
+ZEXTERN uLong ZEXPORT adler32_combine OF((uLong adler1, uLong adler2,
+                                          z_off_t len2));
+/*
+     Combine two Adler-32 checksums into one.  For two sequences of bytes, seq1
+   and seq2 with lengths len1 and len2, Adler-32 checksums were calculated for
+   each, adler1 and adler2.  adler32_combine() returns the Adler-32 checksum of
+   seq1 and seq2 concatenated, requiring only adler1, adler2, and len2.
+*/
+
 ZEXTERN uLong ZEXPORT crc32   OF((uLong crc, const Bytef *buf, uInt len));
 /*
-     Update a running crc with the bytes buf[0..len-1] and return the updated
-   crc. If buf is NULL, this function returns the required initial value
-   for the crc. Pre- and post-conditioning (one's complement) is performed
-   within this function so it shouldn't be done by the application.
+     Update a running CRC-32 with the bytes buf[0..len-1] and return the
+   updated CRC-32. If buf is NULL, this function returns the required initial
+   value for the for the crc. Pre- and post-conditioning (one's complement) is
+   performed within this function so it shouldn't be done by the application.
    Usage example:
 
      uLong crc = crc32(0L, Z_NULL, 0);
@@ -1151,6 +1282,16 @@ ZEXTERN uLong ZEXPORT crc32   OF((uLong crc, const Bytef *buf, uInt len));
      if (crc != original_crc) error();
 */
 
+ZEXTERN uLong ZEXPORT crc32_combine OF((uLong crc1, uLong crc2, z_off_t len2));
+
+/*
+     Combine two CRC-32 check values into one.  For two sequences of bytes,
+   seq1 and seq2 with lengths len1 and len2, CRC-32 check values were
+   calculated for each, crc1 and crc2.  crc32_combine() returns the CRC-32
+   check value of seq1 and seq2 concatenated, requiring only crc1, crc2, and
+   len2.
+*/
+
 
                         /* various hacks, don't look :) */
 
@@ -1167,7 +1308,7 @@ ZEXTERN int ZEXPORT deflateInit2_ OF((z_streamp strm, int  level, int  method,
                                       int stream_size));
 ZEXTERN int ZEXPORT inflateInit2_ OF((z_streamp strm, int  windowBits,
                                       const char *version, int stream_size));
-ZEXTERN int ZEXPORT inflateBackInit_ OF((z_stream FAR *strm, int windowBits,
+ZEXTERN int ZEXPORT inflateBackInit_ OF((z_streamp strm, int windowBits,
                                          unsigned char FAR *window,
                                          const char *version,
                                          int stream_size));

zutil.c

@@ -1,5 +1,5 @@
 /* zutil.c -- target dependent utility functions for the compression library
- * Copyright (C) 1995-2003 Jean-loup Gailly.
+ * Copyright (C) 1995-2004 Jean-loup Gailly.
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
@@ -11,10 +11,6 @@
 struct internal_state      {int dummy;}; /* for buggy compilers */
 #endif
 
-#ifndef STDC
-extern void exit OF((int));
-#endif
-
 const char * const z_errmsg[10] = {
 "need dictionary",     /* Z_NEED_DICT       2  */
 "stream end",          /* Z_STREAM_END      1  */
@@ -141,7 +137,10 @@ const char * ZEXPORT zError(err)
 }
 
 #if defined(_WIN32_WCE)
-    /* does not exist on WCE */
+    /* The Microsoft C Run-Time Library for Windows CE doesn't have
+     * errno.  We define it as a global variable to simplify porting.
+     * Its value is always 0 and should not be used.
+     */
     int errno = 0;
 #endif
 

zutil.h

@@ -1,5 +1,5 @@
 /* zutil.h -- internal interface and configuration of the compression library
- * Copyright (C) 1995-2003 Jean-loup Gailly.
+ * Copyright (C) 1995-2005 Jean-loup Gailly.
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
@@ -17,14 +17,26 @@
 #include "zlib.h"
 
 #ifdef STDC
-#  include <stddef.h>
+#  ifndef _WIN32_WCE
+#    include <stddef.h>
+#  endif
 #  include <string.h>
 #  include <stdlib.h>
 #endif
 #ifdef NO_ERRNO_H
+#   ifdef _WIN32_WCE
+      /* The Microsoft C Run-Time Library for Windows CE doesn't have
+       * errno.  We define it as a global variable to simplify porting.
+       * Its value is always 0 and should not be used.  We rename it to
+       * avoid conflict with other libraries that use the same workaround.
+       */
+#     define errno z_errno
+#   endif
     extern int errno;
 #else
-#   include <errno.h>
+#  ifndef _WIN32_WCE
+#    include <errno.h>
+#  endif
 #endif
 
 #ifndef local
@@ -193,15 +205,6 @@ extern const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
 #  define NO_vsnprintf
 #endif
 
-#ifdef HAVE_STRERROR
-#  ifndef VMS
-     extern char *strerror OF((int));
-#  endif
-#  define zstrerror(errnum) strerror(errnum)
-#else
-#  define zstrerror(errnum) ""
-#endif
-
 #if defined(pyr)
 #  define NO_MEMCPY
 #endif