696 lines
16 KiB
C
696 lines
16 KiB
C
/* $Id: tif_open.c,v 1.33.2.1 2010-06-08 18:50:42 bfriesen Exp $ */
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/*
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* Copyright (c) 1988-1997 Sam Leffler
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* Copyright (c) 1991-1997 Silicon Graphics, Inc.
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*
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* Permission to use, copy, modify, distribute, and sell this software and
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* its documentation for any purpose is hereby granted without fee, provided
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* that (i) the above copyright notices and this permission notice appear in
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* all copies of the software and related documentation, and (ii) the names of
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* Sam Leffler and Silicon Graphics may not be used in any advertising or
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* publicity relating to the software without the specific, prior written
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* permission of Sam Leffler and Silicon Graphics.
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*
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* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
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* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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*
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* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
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* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
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* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
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* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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/*
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* TIFF Library.
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*/
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#include "tiffiop.h"
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static const long typemask[13] = {
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(long)0L, /* TIFF_NOTYPE */
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(long)0x000000ffL, /* TIFF_BYTE */
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(long)0xffffffffL, /* TIFF_ASCII */
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(long)0x0000ffffL, /* TIFF_SHORT */
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(long)0xffffffffL, /* TIFF_LONG */
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(long)0xffffffffL, /* TIFF_RATIONAL */
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(long)0x000000ffL, /* TIFF_SBYTE */
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(long)0x000000ffL, /* TIFF_UNDEFINED */
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(long)0x0000ffffL, /* TIFF_SSHORT */
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(long)0xffffffffL, /* TIFF_SLONG */
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(long)0xffffffffL, /* TIFF_SRATIONAL */
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(long)0xffffffffL, /* TIFF_FLOAT */
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(long)0xffffffffL, /* TIFF_DOUBLE */
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};
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static const int bigTypeshift[13] = {
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0, /* TIFF_NOTYPE */
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24, /* TIFF_BYTE */
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0, /* TIFF_ASCII */
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16, /* TIFF_SHORT */
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0, /* TIFF_LONG */
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0, /* TIFF_RATIONAL */
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24, /* TIFF_SBYTE */
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24, /* TIFF_UNDEFINED */
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16, /* TIFF_SSHORT */
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0, /* TIFF_SLONG */
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0, /* TIFF_SRATIONAL */
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0, /* TIFF_FLOAT */
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0, /* TIFF_DOUBLE */
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};
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static const int litTypeshift[13] = {
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0, /* TIFF_NOTYPE */
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0, /* TIFF_BYTE */
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0, /* TIFF_ASCII */
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0, /* TIFF_SHORT */
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0, /* TIFF_LONG */
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0, /* TIFF_RATIONAL */
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0, /* TIFF_SBYTE */
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0, /* TIFF_UNDEFINED */
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0, /* TIFF_SSHORT */
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0, /* TIFF_SLONG */
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0, /* TIFF_SRATIONAL */
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0, /* TIFF_FLOAT */
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0, /* TIFF_DOUBLE */
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};
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/*
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* Dummy functions to fill the omitted client procedures.
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*/
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static int
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_tiffDummyMapProc(thandle_t fd, tdata_t* pbase, toff_t* psize)
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{
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(void) fd; (void) pbase; (void) psize;
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return (0);
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}
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static void
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_tiffDummyUnmapProc(thandle_t fd, tdata_t base, toff_t size)
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{
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(void) fd; (void) base; (void) size;
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}
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/*
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* Initialize the shift & mask tables, and the
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* byte swapping state according to the file
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* contents and the machine architecture.
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*/
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static void
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TIFFInitOrder(TIFF* tif, int magic)
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{
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tif->tif_typemask = typemask;
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if (magic == TIFF_BIGENDIAN) {
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tif->tif_typeshift = bigTypeshift;
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#ifndef WORDS_BIGENDIAN
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tif->tif_flags |= TIFF_SWAB;
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#endif
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} else {
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tif->tif_typeshift = litTypeshift;
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#ifdef WORDS_BIGENDIAN
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tif->tif_flags |= TIFF_SWAB;
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#endif
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}
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}
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int
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_TIFFgetMode(const char* mode, const char* module)
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{
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int m = -1;
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switch (mode[0]) {
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case 'r':
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m = O_RDONLY;
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if (mode[1] == '+')
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m = O_RDWR;
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break;
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case 'w':
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case 'a':
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m = O_RDWR|O_CREAT;
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if (mode[0] == 'w')
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m |= O_TRUNC;
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break;
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default:
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TIFFErrorExt(0, module, "\"%s\": Bad mode", mode);
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break;
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}
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return (m);
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}
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TIFF*
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TIFFClientOpen(
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const char* name, const char* mode,
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thandle_t clientdata,
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TIFFReadWriteProc readproc,
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TIFFReadWriteProc writeproc,
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TIFFSeekProc seekproc,
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TIFFCloseProc closeproc,
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TIFFSizeProc sizeproc,
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TIFFMapFileProc mapproc,
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TIFFUnmapFileProc unmapproc
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)
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{
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static const char module[] = "TIFFClientOpen";
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TIFF *tif;
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int m;
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const char* cp;
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m = _TIFFgetMode(mode, module);
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if (m == -1)
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goto bad2;
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tif = (TIFF *)_TIFFmalloc(sizeof (TIFF) + strlen(name) + 1);
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if (tif == NULL) {
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TIFFErrorExt(clientdata, module, "%s: Out of memory (TIFF structure)", name);
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goto bad2;
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}
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_TIFFmemset(tif, 0, sizeof (*tif));
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tif->tif_name = (char *)tif + sizeof (TIFF);
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strcpy(tif->tif_name, name);
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tif->tif_mode = m &~ (O_CREAT|O_TRUNC);
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tif->tif_curdir = (tdir_t) -1; /* non-existent directory */
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tif->tif_curoff = 0;
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tif->tif_curstrip = (tstrip_t) -1; /* invalid strip */
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tif->tif_row = (uint32) -1; /* read/write pre-increment */
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tif->tif_clientdata = clientdata;
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if (!readproc || !writeproc || !seekproc || !closeproc || !sizeproc) {
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TIFFErrorExt(clientdata, module,
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"One of the client procedures is NULL pointer.");
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goto bad2;
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}
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tif->tif_readproc = readproc;
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tif->tif_writeproc = writeproc;
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tif->tif_seekproc = seekproc;
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tif->tif_closeproc = closeproc;
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tif->tif_sizeproc = sizeproc;
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if (mapproc)
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tif->tif_mapproc = mapproc;
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else
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tif->tif_mapproc = _tiffDummyMapProc;
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if (unmapproc)
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tif->tif_unmapproc = unmapproc;
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else
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tif->tif_unmapproc = _tiffDummyUnmapProc;
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_TIFFSetDefaultCompressionState(tif); /* setup default state */
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/*
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* Default is to return data MSB2LSB and enable the
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* use of memory-mapped files and strip chopping when
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* a file is opened read-only.
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*/
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tif->tif_flags = FILLORDER_MSB2LSB;
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if (m == O_RDONLY )
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tif->tif_flags |= TIFF_MAPPED;
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#ifdef STRIPCHOP_DEFAULT
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if (m == O_RDONLY || m == O_RDWR)
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tif->tif_flags |= STRIPCHOP_DEFAULT;
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#endif
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/*
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* Process library-specific flags in the open mode string.
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* The following flags may be used to control intrinsic library
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* behaviour that may or may not be desirable (usually for
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* compatibility with some application that claims to support
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* TIFF but only supports some braindead idea of what the
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* vendor thinks TIFF is):
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*
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* 'l' use little-endian byte order for creating a file
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* 'b' use big-endian byte order for creating a file
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* 'L' read/write information using LSB2MSB bit order
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* 'B' read/write information using MSB2LSB bit order
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* 'H' read/write information using host bit order
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* 'M' enable use of memory-mapped files when supported
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* 'm' disable use of memory-mapped files
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* 'C' enable strip chopping support when reading
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* 'c' disable strip chopping support
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* 'h' read TIFF header only, do not load the first IFD
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*
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* The use of the 'l' and 'b' flags is strongly discouraged.
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* These flags are provided solely because numerous vendors,
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* typically on the PC, do not correctly support TIFF; they
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* only support the Intel little-endian byte order. This
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* support is not configured by default because it supports
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* the violation of the TIFF spec that says that readers *MUST*
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* support both byte orders. It is strongly recommended that
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* you not use this feature except to deal with busted apps
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* that write invalid TIFF. And even in those cases you should
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* bang on the vendors to fix their software.
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*
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* The 'L', 'B', and 'H' flags are intended for applications
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* that can optimize operations on data by using a particular
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* bit order. By default the library returns data in MSB2LSB
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* bit order for compatibiltiy with older versions of this
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* library. Returning data in the bit order of the native cpu
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* makes the most sense but also requires applications to check
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* the value of the FillOrder tag; something they probably do
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* not do right now.
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*
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* The 'M' and 'm' flags are provided because some virtual memory
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* systems exhibit poor behaviour when large images are mapped.
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* These options permit clients to control the use of memory-mapped
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* files on a per-file basis.
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*
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* The 'C' and 'c' flags are provided because the library support
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* for chopping up large strips into multiple smaller strips is not
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* application-transparent and as such can cause problems. The 'c'
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* option permits applications that only want to look at the tags,
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* for example, to get the unadulterated TIFF tag information.
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*/
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for (cp = mode; *cp; cp++)
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switch (*cp) {
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case 'b':
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#ifndef WORDS_BIGENDIAN
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if (m&O_CREAT)
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tif->tif_flags |= TIFF_SWAB;
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#endif
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break;
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case 'l':
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#ifdef WORDS_BIGENDIAN
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if ((m&O_CREAT))
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tif->tif_flags |= TIFF_SWAB;
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#endif
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break;
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case 'B':
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tif->tif_flags = (tif->tif_flags &~ TIFF_FILLORDER) |
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FILLORDER_MSB2LSB;
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break;
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case 'L':
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tif->tif_flags = (tif->tif_flags &~ TIFF_FILLORDER) |
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FILLORDER_LSB2MSB;
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break;
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case 'H':
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tif->tif_flags = (tif->tif_flags &~ TIFF_FILLORDER) |
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HOST_FILLORDER;
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break;
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case 'M':
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if (m == O_RDONLY)
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tif->tif_flags |= TIFF_MAPPED;
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break;
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case 'm':
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if (m == O_RDONLY)
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tif->tif_flags &= ~TIFF_MAPPED;
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break;
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case 'C':
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if (m == O_RDONLY)
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tif->tif_flags |= TIFF_STRIPCHOP;
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break;
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case 'c':
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if (m == O_RDONLY)
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tif->tif_flags &= ~TIFF_STRIPCHOP;
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break;
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case 'h':
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tif->tif_flags |= TIFF_HEADERONLY;
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break;
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}
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/*
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* Read in TIFF header.
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*/
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if (tif->tif_mode & O_TRUNC ||
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!ReadOK(tif, &tif->tif_header, sizeof (TIFFHeader))) {
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if (tif->tif_mode == O_RDONLY) {
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TIFFErrorExt(tif->tif_clientdata, name,
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"Cannot read TIFF header");
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goto bad;
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}
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/*
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* Setup header and write.
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*/
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#ifdef WORDS_BIGENDIAN
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tif->tif_header.tiff_magic = tif->tif_flags & TIFF_SWAB
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? TIFF_LITTLEENDIAN : TIFF_BIGENDIAN;
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#else
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tif->tif_header.tiff_magic = tif->tif_flags & TIFF_SWAB
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? TIFF_BIGENDIAN : TIFF_LITTLEENDIAN;
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#endif
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tif->tif_header.tiff_version = TIFF_VERSION;
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if (tif->tif_flags & TIFF_SWAB)
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TIFFSwabShort(&tif->tif_header.tiff_version);
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tif->tif_header.tiff_diroff = 0; /* filled in later */
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/*
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* The doc for "fopen" for some STD_C_LIBs says that if you
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* open a file for modify ("+"), then you must fseek (or
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* fflush?) between any freads and fwrites. This is not
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* necessary on most systems, but has been shown to be needed
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* on Solaris.
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*/
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TIFFSeekFile( tif, 0, SEEK_SET );
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if (!WriteOK(tif, &tif->tif_header, sizeof (TIFFHeader))) {
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TIFFErrorExt(tif->tif_clientdata, name,
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"Error writing TIFF header");
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goto bad;
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}
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/*
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* Setup the byte order handling.
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*/
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TIFFInitOrder(tif, tif->tif_header.tiff_magic);
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/*
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* Setup default directory.
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*/
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if (!TIFFDefaultDirectory(tif))
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goto bad;
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tif->tif_diroff = 0;
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tif->tif_dirlist = NULL;
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tif->tif_dirlistsize = 0;
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tif->tif_dirnumber = 0;
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return (tif);
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}
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/*
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* Setup the byte order handling.
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*/
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if (tif->tif_header.tiff_magic != TIFF_BIGENDIAN &&
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tif->tif_header.tiff_magic != TIFF_LITTLEENDIAN
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#if MDI_SUPPORT
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&&
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#if HOST_BIGENDIAN
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tif->tif_header.tiff_magic != MDI_BIGENDIAN
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#else
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tif->tif_header.tiff_magic != MDI_LITTLEENDIAN
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#endif
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) {
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TIFFErrorExt(tif->tif_clientdata, name,
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"Not a TIFF or MDI file, bad magic number %d (0x%x)",
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#else
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) {
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TIFFErrorExt(tif->tif_clientdata, name,
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"Not a TIFF file, bad magic number %d (0x%x)",
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#endif
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tif->tif_header.tiff_magic,
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tif->tif_header.tiff_magic);
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goto bad;
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}
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TIFFInitOrder(tif, tif->tif_header.tiff_magic);
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/*
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* Swap header if required.
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*/
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if (tif->tif_flags & TIFF_SWAB) {
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TIFFSwabShort(&tif->tif_header.tiff_version);
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TIFFSwabLong(&tif->tif_header.tiff_diroff);
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}
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/*
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* Now check version (if needed, it's been byte-swapped).
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* Note that this isn't actually a version number, it's a
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* magic number that doesn't change (stupid).
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*/
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if (tif->tif_header.tiff_version == TIFF_BIGTIFF_VERSION) {
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TIFFErrorExt(tif->tif_clientdata, name,
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"This is a BigTIFF file. This format not supported\n"
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"by this version of libtiff." );
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goto bad;
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}
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if (tif->tif_header.tiff_version != TIFF_VERSION) {
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TIFFErrorExt(tif->tif_clientdata, name,
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"Not a TIFF file, bad version number %d (0x%x)",
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tif->tif_header.tiff_version,
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tif->tif_header.tiff_version);
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goto bad;
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}
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tif->tif_flags |= TIFF_MYBUFFER;
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tif->tif_rawcp = tif->tif_rawdata = 0;
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tif->tif_rawdatasize = 0;
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/*
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* Sometimes we do not want to read the first directory (for example,
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* it may be broken) and want to proceed to other directories. I this
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* case we use the TIFF_HEADERONLY flag to open file and return
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* immediately after reading TIFF header.
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*/
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if (tif->tif_flags & TIFF_HEADERONLY)
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return (tif);
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/*
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* Setup initial directory.
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*/
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switch (mode[0]) {
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case 'r':
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tif->tif_nextdiroff = tif->tif_header.tiff_diroff;
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/*
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* Try to use a memory-mapped file if the client
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* has not explicitly suppressed usage with the
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* 'm' flag in the open mode (see above).
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*/
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if ((tif->tif_flags & TIFF_MAPPED) &&
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!TIFFMapFileContents(tif, (tdata_t*) &tif->tif_base, &tif->tif_size))
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tif->tif_flags &= ~TIFF_MAPPED;
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if (TIFFReadDirectory(tif)) {
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tif->tif_rawcc = -1;
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tif->tif_flags |= TIFF_BUFFERSETUP;
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return (tif);
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}
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break;
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case 'a':
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/*
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* New directories are automatically append
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* to the end of the directory chain when they
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* are written out (see TIFFWriteDirectory).
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*/
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if (!TIFFDefaultDirectory(tif))
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goto bad;
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return (tif);
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}
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bad:
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tif->tif_mode = O_RDONLY; /* XXX avoid flush */
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TIFFCleanup(tif);
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bad2:
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return ((TIFF*)0);
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}
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/*
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* Query functions to access private data.
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*/
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/*
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* Return open file's name.
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*/
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const char *
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TIFFFileName(TIFF* tif)
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{
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return (tif->tif_name);
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}
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/*
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* Set the file name.
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*/
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const char *
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TIFFSetFileName(TIFF* tif, const char *name)
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{
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const char* old_name = tif->tif_name;
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tif->tif_name = (char *)name;
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return (old_name);
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}
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/*
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* Return open file's I/O descriptor.
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*/
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int
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TIFFFileno(TIFF* tif)
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{
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return (tif->tif_fd);
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}
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/*
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* Set open file's I/O descriptor, and return previous value.
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*/
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int
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TIFFSetFileno(TIFF* tif, int fd)
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{
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int old_fd = tif->tif_fd;
|
|
tif->tif_fd = fd;
|
|
return old_fd;
|
|
}
|
|
|
|
/*
|
|
* Return open file's clientdata.
|
|
*/
|
|
thandle_t
|
|
TIFFClientdata(TIFF* tif)
|
|
{
|
|
return (tif->tif_clientdata);
|
|
}
|
|
|
|
/*
|
|
* Set open file's clientdata, and return previous value.
|
|
*/
|
|
thandle_t
|
|
TIFFSetClientdata(TIFF* tif, thandle_t newvalue)
|
|
{
|
|
thandle_t m = tif->tif_clientdata;
|
|
tif->tif_clientdata = newvalue;
|
|
return m;
|
|
}
|
|
|
|
/*
|
|
* Return read/write mode.
|
|
*/
|
|
int
|
|
TIFFGetMode(TIFF* tif)
|
|
{
|
|
return (tif->tif_mode);
|
|
}
|
|
|
|
/*
|
|
* Return read/write mode.
|
|
*/
|
|
int
|
|
TIFFSetMode(TIFF* tif, int mode)
|
|
{
|
|
int old_mode = tif->tif_mode;
|
|
tif->tif_mode = mode;
|
|
return (old_mode);
|
|
}
|
|
|
|
/*
|
|
* Return nonzero if file is organized in
|
|
* tiles; zero if organized as strips.
|
|
*/
|
|
int
|
|
TIFFIsTiled(TIFF* tif)
|
|
{
|
|
return (isTiled(tif));
|
|
}
|
|
|
|
/*
|
|
* Return current row being read/written.
|
|
*/
|
|
uint32
|
|
TIFFCurrentRow(TIFF* tif)
|
|
{
|
|
return (tif->tif_row);
|
|
}
|
|
|
|
/*
|
|
* Return index of the current directory.
|
|
*/
|
|
tdir_t
|
|
TIFFCurrentDirectory(TIFF* tif)
|
|
{
|
|
return (tif->tif_curdir);
|
|
}
|
|
|
|
/*
|
|
* Return current strip.
|
|
*/
|
|
tstrip_t
|
|
TIFFCurrentStrip(TIFF* tif)
|
|
{
|
|
return (tif->tif_curstrip);
|
|
}
|
|
|
|
/*
|
|
* Return current tile.
|
|
*/
|
|
ttile_t
|
|
TIFFCurrentTile(TIFF* tif)
|
|
{
|
|
return (tif->tif_curtile);
|
|
}
|
|
|
|
/*
|
|
* Return nonzero if the file has byte-swapped data.
|
|
*/
|
|
int
|
|
TIFFIsByteSwapped(TIFF* tif)
|
|
{
|
|
return ((tif->tif_flags & TIFF_SWAB) != 0);
|
|
}
|
|
|
|
/*
|
|
* Return nonzero if the data is returned up-sampled.
|
|
*/
|
|
int
|
|
TIFFIsUpSampled(TIFF* tif)
|
|
{
|
|
return (isUpSampled(tif));
|
|
}
|
|
|
|
/*
|
|
* Return nonzero if the data is returned in MSB-to-LSB bit order.
|
|
*/
|
|
int
|
|
TIFFIsMSB2LSB(TIFF* tif)
|
|
{
|
|
return (isFillOrder(tif, FILLORDER_MSB2LSB));
|
|
}
|
|
|
|
/*
|
|
* Return nonzero if given file was written in big-endian order.
|
|
*/
|
|
int
|
|
TIFFIsBigEndian(TIFF* tif)
|
|
{
|
|
return (tif->tif_header.tiff_magic == TIFF_BIGENDIAN);
|
|
}
|
|
|
|
/*
|
|
* Return pointer to file read method.
|
|
*/
|
|
TIFFReadWriteProc
|
|
TIFFGetReadProc(TIFF* tif)
|
|
{
|
|
return (tif->tif_readproc);
|
|
}
|
|
|
|
/*
|
|
* Return pointer to file write method.
|
|
*/
|
|
TIFFReadWriteProc
|
|
TIFFGetWriteProc(TIFF* tif)
|
|
{
|
|
return (tif->tif_writeproc);
|
|
}
|
|
|
|
/*
|
|
* Return pointer to file seek method.
|
|
*/
|
|
TIFFSeekProc
|
|
TIFFGetSeekProc(TIFF* tif)
|
|
{
|
|
return (tif->tif_seekproc);
|
|
}
|
|
|
|
/*
|
|
* Return pointer to file close method.
|
|
*/
|
|
TIFFCloseProc
|
|
TIFFGetCloseProc(TIFF* tif)
|
|
{
|
|
return (tif->tif_closeproc);
|
|
}
|
|
|
|
/*
|
|
* Return pointer to file size requesting method.
|
|
*/
|
|
TIFFSizeProc
|
|
TIFFGetSizeProc(TIFF* tif)
|
|
{
|
|
return (tif->tif_sizeproc);
|
|
}
|
|
|
|
/*
|
|
* Return pointer to memory mapping method.
|
|
*/
|
|
TIFFMapFileProc
|
|
TIFFGetMapFileProc(TIFF* tif)
|
|
{
|
|
return (tif->tif_mapproc);
|
|
}
|
|
|
|
/*
|
|
* Return pointer to memory unmapping method.
|
|
*/
|
|
TIFFUnmapFileProc
|
|
TIFFGetUnmapFileProc(TIFF* tif)
|
|
{
|
|
return (tif->tif_unmapproc);
|
|
}
|
|
|
|
/* vim: set ts=8 sts=8 sw=8 noet: */
|
|
/*
|
|
* Local Variables:
|
|
* mode: c
|
|
* c-basic-offset: 8
|
|
* fill-column: 78
|
|
* End:
|
|
*/
|