zlib 0.92

ChangeLog

@@ -1,5 +1,23 @@
 		ChangeLog file for zlib
 
+Changes in 0.92 (3 May 95)
+- don't assume that char is signed (problem on SGI)
+- Clear bit buffer when starting a stored block
+- no memcpy on Pyramid
+- suppressed inftest.c
+- optimized fill_window, put longest_match inline for gcc
+- optimized inflate on stored blocks.
+- untabify all sources to simplify patches
+
+Changes in 0.91 (2 May 95)
+- Default MEM_LEVEL is 8 (not 9 for Unix) as documented in zlib.h
+- Document the memory requirements in zconf.h
+- added "make install"
+- fix sync search logic in inflateSync
+- deflate(Z_FULL_FLUSH) now works even if output buffer too short
+- after inflateSync, don't scare people with just "lo world"
+- added support for DJGPP
+
 Changes in 0.9 (1 May 95)
 - don't assume that zalloc clears the allocated memory (the TurboC bug
   was Mark's bug after all :)
@@ -10,6 +28,7 @@ Changes in 0.9 (1 May 95)
 - document explicitly that zalloc(64K) on MSDOS must return a normalized
   pointer (zero offset)
 - added Makefiles for Microsoft C, Turbo C, Borland C++
+- faster crc32()
 
 Changes in 0.8 (29 April 95)
 - added fast inflate (inffast.c)

Makefile

@@ -1,21 +1,37 @@
+# Makefile for zlib
+# Copyright (C) 1995 Jean-loup Gailly.
+# For conditions of distribution and use, see copyright notice in zlib.h 
+
 CC=cc
 CFLAGS=-O
+#use -O3 for gcc to take advantage of inlining
+#CFLAGS="-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7"
 #CFLAGS=-g -DDEBUG
 LDFLAGS=-L. -lgz
 
 RANLIB=ranlib
 
+prefix=/usr/local
+
 OBJS = adler32.o compress.o crc32.o gzio.o uncompr.o deflate.o trees.o \
        zutil.o inflate.o infblock.o inftrees.o infcodes.o infutil.o inffast.o
 
-TEST_OBJS = example.o minigzip.o inftest.o
+TEST_OBJS = example.o minigzip.o
 
-all: example minigzip inftest
+all: example minigzip
 
 test: all
 	./example
 	echo hello world | ./minigzip | ./minigzip -d 
 
+install: libgz.a
+	-@mkdir $(prefix)/include
+	-@mkdir $(prefix)/lib
+	cp zlib.h zconf.h $(prefix)/include
+	chmod 644 $(prefix)/include/zlib.h $(prefix)/include/zconf.h
+	cp libgz.a $(prefix)/lib
+	chmod 644 $(prefix)/lib/libgz.a
+
 libgz.a: $(OBJS)
 	ar rc $@ $(OBJS)
 	$(RANLIB) $@
@@ -26,11 +42,8 @@ example: example.o libgz.a
 minigzip: minigzip.o libgz.a
 	$(CC) $(CFLAGS) -o $@ minigzip.o $(LDFLAGS)
 
-inftest: inftest.o libgz.a
-	$(CC) $(CFLAGS) -o $@ inftest.o $(LDFLAGS)
-
 clean:
-	rm -f *.o example minigzip inftest libgz.a foo.gz
+	rm -f *.o example minigzip libgz.a foo.gz
 
 zip:
 	zip -ul9 zlib README ChangeLog Makefile Makefile.??? Makefile.?? *.[ch]
@@ -51,7 +64,6 @@ infblock.o: zutil.h zlib.h zconf.h infblock.h inftrees.h infcodes.h infutil.h
 infcodes.o: zutil.h zlib.h zconf.h inftrees.h infutil.h infcodes.h inffast.h
 inffast.o: zutil.h zlib.h zconf.h inftrees.h infutil.h inffast.h
 inflate.o: zutil.h zlib.h zconf.h infblock.h
-inftest.o: zutil.h zlib.h zconf.h
 inftrees.o: zutil.h zlib.h zconf.h inftrees.h
 infutil.o: zutil.h zlib.h zconf.h inftrees.h infutil.h
 minigzip.o: zlib.h zconf.h

Makefile.bak

@@ -1,59 +0,0 @@
-CC=gcc
-CFLAGS=-O2
-#CFLAGS=-g -DDEBUG
-LDFLAGS=-L. -lgz
-
-RANLIB=ranlib
-
-OBJS = adler32.o compress.o crc32.o gzio.o uncompr.o deflate.o trees.o \
-       zutil.o inflate.o infblock.o inftrees.o infcodes.o infutil.o inffast.o
-
-TEST_OBJS = example.o minigzip.o inftest.o
-
-all: example minigzip inftest
-
-test: all
-	./example
-	echo hello world | ./minigzip | ./minigzip -d 
-
-libgz.a: $(OBJS)
-	ar rc $@ $(OBJS)
-	$(RANLIB) $@
-
-example: example.o libgz.a
-	$(CC) $(CFLAGS) -o $@ example.o $(LDFLAGS)
-
-minigzip: minigzip.o libgz.a
-	$(CC) $(CFLAGS) -o $@ minigzip.o $(LDFLAGS)
-
-inftest: inftest.o libgz.a
-	$(CC) $(CFLAGS) -o $@ inftest.o $(LDFLAGS)
-
-clean:
-	rm -f *.o example minigzip inftest libgz.a foo.gz
-
-zip:
-	zip -ul9 zlib README ChangeLog Makefile *.[ch]
-
-tgz:
-	cd ..; tar cfz zlib/zlib.tgz zlib/README zlib/ChangeLog zlib/Makefile \
-		zlib/*.[ch]
-
-# DO NOT DELETE THIS LINE -- make depend depends on it.
-
-adler32.o: zutil.h zlib.h zconf.h
-compress.o: zlib.h zconf.h
-crc32.o: zutil.h zlib.h zconf.h
-deflate.o: deflate.h zutil.h zlib.h zconf.h
-example.o: zlib.h zconf.h
-gzio.o: zutil.h zlib.h zconf.h
-infblock.o: zutil.h zlib.h zconf.h infblock.h inftrees.h infcodes.h infutil.h
-infcodes.o: zutil.h zlib.h zconf.h inftrees.h infutil.h infcodes.h
-inflate.o: zutil.h zlib.h zconf.h infblock.h
-inftest.o: zutil.h zlib.h zconf.h
-inftrees.o: zutil.h zlib.h zconf.h inftrees.h
-infutil.o: zutil.h zlib.h zconf.h inftrees.h infutil.h
-minigzip.o: zlib.h zconf.h
-trees.o: deflate.h zutil.h zlib.h zconf.h
-uncompr.o: zlib.h zconf.h
-zutil.o: zutil.h zlib.h zconf.h

Makefile.bor

@@ -4,7 +4,10 @@
 # To use, do "make -fmakefile.bor"
 
 # WARNING: the small model is supported but only for small values of
-# MAX_WBITS and MAX_MEM_LEVEL
+# MAX_WBITS and MAX_MEM_LEVEL. If you wish to reduce the memory
+# requirements (default 256K for big objects plus a few K), you can add
+# to CFLAGS below: -DMAX_MEM_LEVEL=7 -DMAX_WBITS=14
+# See zconf.h for details about the memory requirements.
 
 # ------------- Turbo C++, Borland C++ -------------
 MODEL=-ml

Makefile.msc

@@ -4,7 +4,10 @@
 # To use, do "make makefile.msc"
 
 # WARNING: the small model is supported but only for small values of
-# MAX_WBITS and MAX_MEM_LEVEL
+# MAX_WBITS and MAX_MEM_LEVEL. If you wish to reduce the memory
+# requirements (default 256K for big objects plus a few K), you can add
+# to CFLAGS below: -DMAX_MEM_LEVEL=7 -DMAX_WBITS=14
+# See zconf.h for details about the memory requirements.
 
 # ------------- Microsoft C 5.1 and later -------------
 MODEL=-AL

Makefile.tc

@@ -4,7 +4,10 @@
 # To use, do "make -fmakefile.tc"
 
 # WARNING: the small model is supported but only for small values of
-# MAX_WBITS and MAX_MEM_LEVEL
+# MAX_WBITS and MAX_MEM_LEVEL. If you wish to reduce the memory
+# requirements (default 256K for big objects plus a few K), you can add
+# to CFLAGS below: -DMAX_MEM_LEVEL=7 -DMAX_WBITS=14
+# See zconf.h for details about the memory requirements.
 
 # ------------- Turbo C 2.0 -------------
 MODEL=-ml

README

@@ -1,25 +1,34 @@
-zlib 0.9 is a beta version of a general purpose compression library.
+zlib 0.92 is a beta version of a general purpose compression library.
 
 The data format used by the zlib library is described in the
-file zlib-3.1.doc, deflate-1.1.doc and gzip-4.1.doc, available
+files zlib-3.1.doc, deflate-1.1.doc and gzip-4.1.doc, available
 in ftp.uu.net:/pub/archiving/zip/doc.
 
 All functions of the compression library are documented in the file
 zlib.h. A usage example of the library is given in the file example.c
 which also tests that the library is working correctly.
-To compile all files and run the test program, just type: make test
 
-The changes made in version 0.9 are documented in the file ChangeLog.
-The main changes since 0.8 are:
-- don't assume that zalloc clears the allocated memory
-- let again gzread copy uncompressed data unchanged (was working in 0.71)
-- deflate(Z_FULL_FLUSH), inflateReset and inflateSync are now fully implemented
+To compile all files and run the test program, just type: make test
+(For MSDOS, use one of the special makefiles such as Makefile.msc.)
+To install the zlib library (libgz.a) in /usr/local/lib, type: make install
+To install in a different directory, use for example: make install prefix=$HOME
+This will install in $HOME/lib instead of /usr/local/lib.
+
+The changes made in version 0.92 are documented in the file ChangeLog.
+The main changes since 0.9 are:
+- don't assume that char is signed (problem on SGI)
+- Default MEM_LEVEL is 8 (not 9 for Unix) as documented in zlib.h
+- Document the memory requirements in zconf.h
+- added "make install"
+- added support for DJGPP and Pyramid
+- fix an inflate bug for stored blocks.
+- various speedups
 
 On MSDOS, this version works in both large and small model. However
-small model compression works only for small values of MEM_LEVEL and
-WBITS (see zutil.h). Small model decompression should work up to WBITS=15.
-This version of zlib does not support small or medium model with far
-allocation of big objects.
+small model compression works only for small values of MAX_MEM_LEVEL
+and MAX_WBITS (see zconf.h). Small model decompression should work up
+to MAX_WBITS=15.  This version of zlib does not support small or
+medium model with far allocation of big objects.
 
 
   Copyright (C) 1995 Jean-loup Gailly and Mark Adler

adler32.c

@@ -3,7 +3,7 @@
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
-/* $Id: adler32.c,v 1.5 1995/04/14 14:49:51 jloup Exp $ */
+/* $Id: adler32.c,v 1.6 1995/05/03 17:27:08 jloup Exp $ */
 
 #include "zutil.h"
 

compress.c

@@ -3,7 +3,7 @@
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
-/* $Id: compress.c,v 1.5 1995/04/29 17:18:43 jloup Exp $ */
+/* $Id: compress.c,v 1.6 1995/05/03 17:27:08 jloup Exp $ */
 
 #include "zlib.h"
 

deflate.c

@@ -47,7 +47,7 @@
  *
  */
 
-/* $Id: deflate.c,v 1.6 1995/05/01 17:23:57 jloup Exp $ */
+/* $Id: deflate.c,v 1.8 1995/05/03 17:27:08 jloup Exp $ */
 
 #include "deflate.h"
 
@@ -165,7 +165,7 @@ int deflateInit (strm, level)
     z_stream *strm;
     int level;
 {
-    return deflateInit2 (strm, level, DEFLATED, MAX_WBITS, MAX_MEM_LEVEL, 0);
+    return deflateInit2 (strm, level, DEFLATED, MAX_WBITS, DEF_MEM_LEVEL, 0);
     /* To do: ignore strm->next_in if we use it as window */
 }
 
@@ -344,22 +344,23 @@ int deflate (strm, flush)
      */
     if (strm->avail_in != 0 ||
         (flush == Z_FINISH && strm->state->status != FINISH_STATE)) {
+        int quit;
         
         if (flush == Z_FINISH) {
             strm->state->status = FINISH_STATE;
         }
         if (strm->state->level <= 3) {
-	    if (deflate_fast(strm->state, flush)) return Z_OK;
+            quit = deflate_fast(strm->state, flush);
         } else {
-	    if (deflate_slow(strm->state, flush)) return Z_OK;
+            quit = deflate_slow(strm->state, flush);
         }
-	/* ??? remember Z_FULL_FLUSH if we didn't have enough space */
         if (flush == Z_FULL_FLUSH) {
             ct_stored_block(strm->state, (char*)0, 0L, 0); /* special marker */
             flush_pending(strm);
             CLEAR_HASH(strm->state);             /* forget history */
             if (strm->avail_out == 0) return Z_OK;
         }
+        if (quit) return Z_OK;
     }
     Assert(strm->avail_out > 0, "bug2");
 
@@ -487,7 +488,7 @@ local void lm_init (s)
 /* For 80x86 and 680x0, an optimized version will be provided in match.asm or
  * match.S. The code will be functionally equivalent.
  */
-local int longest_match(s, cur_match)
+local INLINE int longest_match(s, cur_match)
     deflate_state *s;
     IPos cur_match;                             /* current match */
 {
@@ -501,6 +502,8 @@ local int longest_match(s, cur_match)
     /* Stop when cur_match becomes <= limit. To simplify the code,
      * we prevent matches with the string of window index 0.
      */
+    Pos *prev = s->prev;
+    uInt wmask = s->w_mask;
 
 #ifdef UNALIGNED_OK
     /* Compare two bytes at a time. Note: this is not always beneficial.
@@ -608,7 +611,7 @@ local int longest_match(s, cur_match)
             scan_end   = scan[best_len];
 #endif
         }
-    } while ((cur_match = s->prev[cur_match & s->w_mask]) > limit
+    } while ((cur_match = prev[cur_match & wmask]) > limit
              && --chain_length != 0);
 
     return best_len;
@@ -655,14 +658,16 @@ local void fill_window(s)
     deflate_state *s;
 {
     register unsigned n, m;
+    register Pos *p;
     unsigned more;    /* Amount of free space at the end of the window. */
+    uInt wsize = s->w_size;
 
     do {
         more = (unsigned)(s->window_size -(ulg)s->lookahead -(ulg)s->strstart);
 
         /* Deal with !@#$% 64K limit: */
         if (more == 0 && s->strstart == 0 && s->lookahead == 0) {
-	    more = s->w_size;
+            more = wsize;
         } else if (more == (unsigned)(-1)) {
             /* Very unlikely, but possible on 16 bit machine if strstart == 0
              * and lookahead == 1 (input done one byte at time)
@@ -672,30 +677,39 @@ local void fill_window(s)
         /* If the window is almost full and there is insufficient lookahead,
          * move the upper half to the lower one to make room in the upper half.
          */
-        } else if (s->strstart >= s->w_size+MAX_DIST(s)) {
+        } else if (s->strstart >= wsize+MAX_DIST(s)) {
 
             /* By the IN assertion, the window is not empty so we can't confuse
              * more == 0 with more == 64K on a 16 bit machine.
              */
-            memcpy((char*)s->window, (char*)s->window+s->w_size,
-		   (unsigned)s->w_size);
-            s->match_start -= s->w_size;
-            s->strstart    -= s->w_size; /* we now have strstart >= MAX_DIST */
+            zmemcpy((char*)s->window, (char*)s->window+wsize,
+                   (unsigned)wsize);
+            s->match_start -= wsize;
+            s->strstart    -= wsize; /* we now have strstart >= MAX_DIST */
 
-            s->block_start -= (long) s->w_size;
+            s->block_start -= (long) wsize;
 
-            for (n = 0; n < s->hash_size; n++) {
-                m = s->head[n];
-                s->head[n] = (Pos)(m >= s->w_size ? m-s->w_size : NIL);
-            }
-            for (n = 0; n < s->w_size; n++) {
-                m = s->prev[n];
-                s->prev[n] = (Pos)(m >= s->w_size ? m-s->w_size : NIL);
+            /* Slide the hash table (could be avoided with 32 bit values
+               at the expense of memory usage):
+             */
+            n = s->hash_size;
+            p = &s->head[n-1];
+            do {
+                m = *p;
+                *p-- = (Pos)(m >= wsize ? m-wsize : NIL);
+            } while (--n);
+
+            n = wsize;
+            p = &s->prev[n-1];
+            do {
+                m = *p;
+                *p-- = (Pos)(m >= wsize ? m-wsize : NIL);
                 /* If n is not on any hash chain, prev[n] is garbage but
                  * its value will never be used.
                  */
-            }
-            more += s->w_size;
+            } while (--n);
+
+            more += wsize;
         }
         if (s->strm->avail_in == 0) return;
 

deflate.h

@@ -8,7 +8,7 @@
    subject to change. Applications should only use zlib.h.
  */
 
-/* $Id: deflate.h,v 1.4 1995/05/01 15:08:45 jloup Exp $ */
+/* $Id: deflate.h,v 1.5 1995/05/03 17:27:09 jloup Exp $ */
 
 #include "zutil.h"
 

example.c

@@ -3,7 +3,7 @@
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
-/* $Id: example.c,v 1.7 1995/05/01 16:57:22 jloup Exp $ */
+/* $Id: example.c,v 1.9 1995/05/03 17:27:09 jloup Exp $ */
 
 #include <stdio.h>
 #include "zlib.h"
@@ -12,7 +12,9 @@
 #  include <string.h>
 #endif
 
+#ifndef __GO32__
 extern void exit  __P((int));
+#endif
 
 #define BUFLEN 4096
 
@@ -253,7 +255,7 @@ void test_sync(compr)
     err = inflateEnd(&d_stream);
     CHECK_ERR(err, "inflateEnd");
 
-    printf("after inflateSync(): %s\n", uncompr);
+    printf("after inflateSync(): hel%s\n", uncompr);
 }
 
 /* ===========================================================================

gzio.c

@@ -3,7 +3,7 @@
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
-/* $Id: gzio.c,v 1.6 1995/04/30 19:52:21 jloup Exp $ */
+/* $Id: gzio.c,v 1.8 1995/05/03 17:27:09 jloup Exp $ */
 
 #include <stdio.h>
 
@@ -128,7 +128,7 @@ local gzFile gz_open (path, mode, fd)
     
     if (s->mode == 'w') {
         err = deflateInit2(&(s->stream), Z_DEFAULT_COMPRESSION,
-			   DEFLATED, -MAX_WBITS, MAX_MEM_LEVEL, 0);
+                           DEFLATED, -MAX_WBITS, DEF_MEM_LEVEL, 0);
         /* windowBits is passed < 0 to suppress zlib header */
 
         s->stream.next_out = s->outbuf = ALLOC(Z_BUFSIZE);
@@ -221,7 +221,7 @@ gzFile gzdopen (fd, mode)
     char *mode;
 {
     char name[20];
-    sprintf(name, "_fd:%d_", fd); /* for debugging */
+    sprintf(name, "<fd:%d>", fd); /* for debugging */
 
     return gz_open (name, mode, fd);
 }

infblock.c

@@ -180,17 +180,23 @@ int r;
         r = Z_DATA_ERROR;
         LEAVE
       }
-      k = 0;				/* dump bits */
       s->sub.left = (uInt)b & 0xffff;
+      k = b = 0;                      /* dump bits */
       Tracev((stderr, "inflate:       stored length %u\n", s->sub.left));
       s->mode = s->sub.left ? STORED : TYPE;
       break;
     case STORED:
-      do {
-        NEEDBYTE
+      if (n == 0)
+        LEAVE
       NEEDOUT
-	OUTBYTE(NEXTBYTE)
-      } while (--s->sub.left);
+      t = s->sub.left;
+      if (t > n) t = n;
+      if (t > m) t = m;
+      zmemcpy(q, p, t);
+      p += t;  n -= t;
+      q += t;  m -= t;
+      if ((s->sub.left -= t) != 0)
+        break;
       Tracev((stderr, "inflate:       stored end, %lu total out\n",
               z->total_out + (q >= s->read ? q - s->read :
               (s->end - s->read) + (q - s->window))));

inflate.c

@@ -145,7 +145,7 @@ int f;
   {
     case METHOD:
       NEEDBYTE
-      if (((z->state->sub.method = NEXTBYTE) & 0xf != DEFLATED))
+      if (((z->state->sub.method = NEXTBYTE) & 0xf) != DEFLATED)
       {
         z->state->mode = BAD;
         z->msg = "unknown compression method";
@@ -243,7 +243,10 @@ z_stream *z;
   if (z == Z_NULL || z->state == Z_NULL)
     return Z_STREAM_ERROR;
   if (z->state->mode != BAD)
+  {
+    z->state->mode = BAD;
     z->state->sub.marker = 0;
+  }
   if ((n = z->avail_in) == 0)
     return Z_BUF_ERROR;
   p = z->next_in;
@@ -252,10 +255,12 @@ z_stream *z;
   /* search */
   while (n && m < 4)
   {
-    if (*p == (m < 2 ? 0 : 0xff))
+    if (*p == (Byte)(m < 2 ? 0 : 0xff))
       m++;
-    else if (*p || m > 2)
+    else if (*p)
       m = 0;
+    else
+      m = 4 - m;
     p++, n--;
   }
 

inftest.c

@@ -1,69 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include "zutil.h"
-
-void main __P((void));
-
-/* This test is in honor of Ed Hamrick who suggested that the interface
-   to inflate be a byte at a time--this implements that, and is, of course,
-   monumentally slow.  It has the virtue though of stressing the push-pull
-   interface for testing purposes. */
-
-void main()
-{
-  int a, r;
-  char c;
-  z_stream z;
-
-  z.zalloc = Z_NULL;
-  z.zfree = Z_NULL;
-  r = inflateInit(&z);
-  if (r != Z_OK)
-    fprintf(stderr, "init error: %s\n", z_errmsg[1 - r]);
-  while ((a = getchar()) != EOF)
-  {
-    /* feed one byte of input */
-    z.avail_out = 0;
-    c = (char)a;
-    z.next_in = (Byte*)&c;
-    z.avail_in = 1;
-    r = inflate(&z, 0);
-    if (r == Z_STREAM_END)
-      break;
-    if (r != Z_OK)
-    {
-      fprintf(stderr, "inflate error: %s\n", z_errmsg[1 - r]);
-      break;
-    }
-    if (z.avail_in != 0)
-    {
-      fprintf(stderr, "inflate didn't eat byte and didn't say buf err!\n");
-      break;
-    }
-
-    /* empty output one byte at a time */
-    while (1)
-    {
-      z.next_out = (Byte*)&c;
-      z.avail_out = 1;
-      r = inflate(&z, 0);
-      if (r == Z_STREAM_END)
-	break;
-      if (r != Z_OK && r != Z_BUF_ERROR)
-      {
-	fprintf(stderr, "inflate error: %s\n", z_errmsg[1 - r]);
-	break;
-      }
-      if (z.avail_out == 0)
-        putchar(c);
-      else
-        break;
-    }
-    if (r != Z_OK && r != Z_BUF_ERROR)
-      break;
-  }
-  inflateEnd(&z);
-  fprintf(stderr, "%ld bytes in, %ld bytes out\n", z.total_in, z.total_out);
-  if (z.msg != NULL)
-    fprintf(stderr, "msg is <%s>\n", z.msg);
-}

inftrees.c

@@ -245,8 +245,8 @@ z_stream *zs;		/* for zalloc function */
         if (h)
         {
           x[h] = i;             /* save pattern for backing up */
-          r.bits = (char)l;     /* bits to dump before this table */
-          r.exop = -(char)j;    /* bits in this table */
+          r.bits = (Byte)l;     /* bits to dump before this table */
+          r.exop = -(Char)j;    /* bits in this table */
           r.next = q;           /* pointer to this table */
           j = i >> (w - l);     /* (get around Turbo C bug) */
           u[h-1][j] = r;        /* connect to last table */
@@ -254,17 +254,17 @@ z_stream *zs;		/* for zalloc function */
       }
 
       /* set up table entry in r */
-      r.bits = (char)(k - w);
+      r.bits = (Byte)(k - w);
       if (p >= v + n)
-        r.exop = -128;          /* out of values--invalid code */
+        r.exop = (Char)(-128);        /* out of values--invalid code */
       else if (*p < s)
       {
-        r.exop = (char)(*p < 256 ? 16 : -64);   /* 256 is end-of-block code */
+        r.exop = (Char)(*p < 256 ? 16 : -64);   /* 256 is end-of-block code */
         r.base = *p++;          /* simple code is just the value */
       }
       else
       {
-        r.exop = (char)e[*p - s];       /* non-simple--look up in lists */
+        r.exop = (Char)e[*p - s];       /* non-simple--look up in lists */
         r.base = d[*p++ - s];
       }
 

inftrees.h

@@ -16,12 +16,18 @@
    indicates an unused code.  If a code with exop == -128 is looked up,
    this implies an error in the data. */
 
+#if defined(STDC) || defined(sgi)
+typedef signed char Char;
+#else
+typedef char Char; /* just hope that char is signed */
+#endif
+
 typedef struct inflate_huft_s inflate_huft;
 struct inflate_huft_s {
   union {
     struct {
-      char Exop;        /* number of extra bits or operation */
-      char Bits;        /* number of bits in this code or subcode */
+      Char Exop;        /* number of extra bits or operation */
+      Byte Bits;        /* number of bits in this code or subcode */
     } what;
     Byte *pad;          /* pad structure to a power of 2 (4 bytes for */
   } word;               /*  16-bit, 8 bytes for 32-bit machines) */

minigzip.c

@@ -13,12 +13,14 @@
  * or in pipe mode.
  */
 
-/* $Id: minigzip.c,v 1.3 1995/04/29 14:27:21 jloup Exp $ */
+/* $Id: minigzip.c,v 1.5 1995/05/03 17:27:11 jloup Exp $ */
 
 #include <stdio.h>
 #include "zlib.h"
 
+#ifndef __GO32__
 extern void exit  __P((int));
+#endif
 extern int unlink __P((const char *));
 
 #ifdef STDC

trees.c

@@ -29,7 +29,7 @@
  *          Addison-Wesley, 1983. ISBN 0-201-06672-6.
  */
 
-/* $Id: trees.c,v 1.4 1995/05/01 16:53:44 jloup Exp $ */
+/* $Id: trees.c,v 1.5 1995/05/03 17:27:12 jloup Exp $ */
 
 #include "deflate.h"
 

uncompr.c

@@ -3,7 +3,7 @@
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
-/* $Id: uncompr.c,v 1.4 1995/04/10 16:22:22 jloup Exp $ */
+/* $Id: uncompr.c,v 1.5 1995/05/03 17:27:12 jloup Exp $ */
 
 #include "zlib.h"
 

zconf.h

@@ -3,7 +3,7 @@
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
-/* $Id: zconf.h,v 1.10 1995/04/30 19:27:14 jloup Exp $ */
+/* $Id: zconf.h,v 1.12 1995/05/03 17:27:12 jloup Exp $ */
 
 #ifndef _ZCONF_H
 #define _ZCONF_H
@@ -32,6 +32,7 @@
 #  define STDC
 #endif
 
+/* Maximum value for memLevel in deflateInit2 */
 #ifndef MAX_MEM_LEVEL
 #  ifdef MAXSEG_64K
 #    define MAX_MEM_LEVEL 8
@@ -40,10 +41,24 @@
 #  endif
 #endif
 
+/* Maximum value for windowBits in deflateInit2 and inflateInit2 */
 #ifndef MAX_WBITS
 #  define MAX_WBITS   15 /* 32K LZ77 window */
 #endif
 
+/* The memory requirements for deflate are (in bytes):
+            1 << (windowBits+2)   +  1 << (memLevel+9)
+ that is: 128K for windowBits=15  +  128K for memLevel = 8  (default values)
+ plus a few kilobytes for small objects. For example, if you want to reduce
+ the default memory requirements from 256K to 128K, compile with
+     make CFLAGS="-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7"
+ Of course this will generally degrade compression (there's no free lunch).
+
+   The memory requirements for inflate are (in bytes) 1 << windowBits
+ that is, 32K for windowBits=15 (default value) plus a few kilobytes
+ for small objects.
+*/
+
                         /* Type declarations */
 
 #ifndef __P /* function prototypes */

zlib.h

@@ -1,5 +1,5 @@
 /* zlib.h -- interface of the 'zlib' general purpose compression library
-  version 0.9 April 30th, 1995.
+  version 0.92 May 3rd, 1995.
 
   Copyright (C) 1995 Jean-loup Gailly and Mark Adler
 
@@ -28,7 +28,7 @@
 
 #include "zconf.h"
 
-#define ZLIB_VERSION "0.9"
+#define ZLIB_VERSION "0.92"
 
 /* 
      The 'zlib' compression library provides in-memory compression and
@@ -335,7 +335,8 @@ extern int deflateInit2 __P((z_stream *strm,
     The memLevel parameter specifies how much memory should be allocated
    for the internal compression state. memLevel=1 uses minimum memory but
    is slow and reduces compression ratio; memLevel=9 uses maximum memory
-   for optimal speed. The default value is 8.
+   for optimal speed. The default value is 8. See zconf.h for total memory
+   usage as a function of windowBits and memLevel.
 
      The strategy parameter is used to tune the compression algorithm. Use
    the value Z_DEFAULT_STRATEGY for normal data, Z_FILTERED for data

zutil.c

@@ -3,13 +3,15 @@
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
-/* $Id: zutil.c,v 1.6 1995/04/29 14:54:02 jloup Exp $ */
+/* $Id: zutil.c,v 1.8 1995/05/03 17:27:12 jloup Exp $ */
 
 #include <stdio.h>
 
 #include "zutil.h"
 
+#ifndef __GO32__
 extern void exit __P((int));
+#endif
 
 char *zlib_version = ZLIB_VERSION;
 
@@ -55,8 +57,9 @@ void zmemzero(dest, len)
 }
 #endif
 
-#if defined(MSDOS) && !defined(__SMALL__) && !defined(M_I86SM)
-#  ifdef __TURBOC__
+#if defined(__TURBOC__) && !defined(__SMALL__)
+
+#  define MY_ZCALLOC
 
 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
  * and farmalloc(64K) returns a pointer with an offset of 8, so we
@@ -124,8 +127,11 @@ void  zcfree (voidp opaque, voidp ptr)
     ptr = opaque; /* just to make some compilers happy */
     z_error("zcfree: ptr not found");
 }
+#endif /* __TURBOC__ */
 
-#  else /* MSC */
+#if defined(M_I86CM) || defined(M_I86LM) /* MSC compact or large model */
+
+#  define MY_ZCALLOC
 
 #if (!defined(_MSC_VER) || (_MSC_VER < 600))
 #  define _halloc  halloc
@@ -144,12 +150,15 @@ void  zcfree (voidp opaque, voidp ptr)
     _hfree(ptr);
 }
 
-#  endif /* __TURBOC__ ? */
+#endif /* defined(M_I86CM) || defined(M_I86LM) */
 
-#else /* !MSDOS */
 
+#ifndef MY_ZCALLOC /* Any system without a special alloc function */
+
+#ifndef __GO32__
 extern voidp calloc __P((uInt items, uInt size));
 extern void  free   __P((voidp ptr));
+#endif
 
 voidp zcalloc (opaque, items, size)
     voidp opaque;
@@ -166,4 +175,4 @@ void  zcfree (opaque, ptr)
     free(ptr);
 }
 
-#endif /* MSDOS */
+#endif /* MY_ZCALLOC */

zutil.h

@@ -8,15 +8,22 @@
    subject to change. Applications should only use zlib.h.
  */
 
-/* $Id: zutil.h,v 1.7 1995/04/30 10:55:33 jloup Exp $ */
+/* $Id: zutil.h,v 1.9 1995/05/03 17:27:12 jloup Exp $ */
 
 #ifndef _Z_UTIL_H
 #define _Z_UTIL_H
 
 #include "zlib.h"
 
+#ifdef __GNUC__
+#  define INLINE inline
+#else
+#  define INLINE
+#endif
+
 #ifdef MSDOS
 #   include <stddef.h>
+#   include <errno.h>
 #else
     extern int errno;
 #endif
@@ -43,7 +50,14 @@ extern char *z_errmsg[]; /* indexed by 1-zlib_error */
 #define DEFLATED   8
 
 #define DEF_WBITS 15
-/* default WBITS for decompression. MAX_WBITS is useful for compression only */
+/* default windowBits for decompression. MAX_WBITS is for compression only */
+
+#if MAX_MEM_LEVEL >= 8
+#  define DEF_MEM_LEVEL 8
+#else
+#  define DEF_MEM_LEVEL  MAX_MEM_LEVEL
+#endif
+/* default memLevel */
 
 #define STORED_BLOCK 0
 #define STATIC_TREES 1
@@ -118,7 +132,10 @@ extern char *z_errmsg[]; /* indexed by 1-zlib_error */
 #  define zstrerror(errnum) ""
 #endif
 
-#if defined(STDC) && !defined(HAVE_MEMCPY)
+#if defined(pyr) && !defined(NO_MEMCPY)
+#  define NO_MEMCPY
+#endif
+#if defined(STDC) && !defined(HAVE_MEMCPY) && !defined(NO_MEMCPY)
 #  define HAVE_MEMCPY
 #endif
 #ifdef HAVE_MEMCPY