[wxWidgets.git] / src / tiff / libtiff / tif_open.c


/*
 * Copyright (c) 1988-1997 Sam Leffler
 * Copyright (c) 1991-1997 Silicon Graphics, Inc.
 *
 * Permission to use, copy, modify, distribute, and sell this software and 
 * its documentation for any purpose is hereby granted without fee, provided
 * that (i) the above copyright notices and this permission notice appear in
 * all copies of the software and related documentation, and (ii) the names of
 * Sam Leffler and Silicon Graphics may not be used in any advertising or
 * publicity relating to the software without the specific, prior written
 * permission of Sam Leffler and Silicon Graphics.
 * 
 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 
 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY 
 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  
 * 
 * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF 
 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 
 * OF THIS SOFTWARE.
 */

/*
 * TIFF Library.
 */
#include "tiffiop.h"

/*
 * Dummy functions to fill the omitted client procedures.
 */
static int
_tiffDummyMapProc(thandle_t fd, void** pbase, toff_t* psize)
{
	(void) fd; (void) pbase; (void) psize;
	return (0);
}

static void
_tiffDummyUnmapProc(thandle_t fd, void* base, toff_t size)
{
	(void) fd; (void) base; (void) size;
}

int
_TIFFgetMode(const char* mode, const char* module)
{
	int m = -1;

	switch (mode[0]) {
	case 'r':
		m = O_RDONLY;
		if (mode[1] == '+')
			m = O_RDWR;
		break;
	case 'w':
	case 'a':
		m = O_RDWR|O_CREAT;
		if (mode[0] == 'w')
			m |= O_TRUNC;
		break;
	default:
		TIFFErrorExt(0, module, "\"%s\": Bad mode", mode);
		break;
	}
	return (m);
}

TIFF*
TIFFClientOpen(
	const char* name, const char* mode,
	thandle_t clientdata,
	TIFFReadWriteProc readproc,
	TIFFReadWriteProc writeproc,
	TIFFSeekProc seekproc,
	TIFFCloseProc closeproc,
	TIFFSizeProc sizeproc,
	TIFFMapFileProc mapproc,
	TIFFUnmapFileProc unmapproc
)
{
	static const char module[] = "TIFFClientOpen";
	TIFF *tif;
	int m;
	const char* cp;

	/* The following are configuration checks. They should be redundant, but should not
	 * compile to any actual code in an optimised release build anyway. If any of them
	 * fail, (makefile-based or other) configuration is not correct */
	assert(sizeof(uint8)==1);
	assert(sizeof(int8)==1);
	assert(sizeof(uint16)==2);
	assert(sizeof(int16)==2);
	assert(sizeof(uint32)==4);
	assert(sizeof(int32)==4);
	assert(sizeof(uint64)==8);
	assert(sizeof(int64)==8);
	assert(sizeof(tmsize_t)==sizeof(void*));
	{
		union{
			uint8 a8[2];
			uint16 a16;
		} n;
		n.a8[0]=1;
		n.a8[1]=0;
		#ifdef WORDS_BIGENDIAN
		assert(n.a16==256);
		#else
		assert(n.a16==1);
		#endif
	}

	m = _TIFFgetMode(mode, module);
	if (m == -1)
		goto bad2;
	tif = (TIFF *)_TIFFmalloc((tmsize_t)(sizeof (TIFF) + strlen(name) + 1));
	if (tif == NULL) {
		TIFFErrorExt(clientdata, module, "%s: Out of memory (TIFF structure)", name);
		goto bad2;
	}
	_TIFFmemset(tif, 0, sizeof (*tif));
	tif->tif_name = (char *)tif + sizeof (TIFF);
	strcpy(tif->tif_name, name);
	tif->tif_mode = m &~ (O_CREAT|O_TRUNC);
	tif->tif_curdir = (uint16) -1;		/* non-existent directory */
	tif->tif_curoff = 0;
	tif->tif_curstrip = (uint32) -1;	/* invalid strip */
	tif->tif_row = (uint32) -1;		/* read/write pre-increment */
	tif->tif_clientdata = clientdata;
	if (!readproc || !writeproc || !seekproc || !closeproc || !sizeproc) {
		TIFFErrorExt(clientdata, module,
		    "One of the client procedures is NULL pointer.");
		goto bad2;
	}
	tif->tif_readproc = readproc;
	tif->tif_writeproc = writeproc;
	tif->tif_seekproc = seekproc;
	tif->tif_closeproc = closeproc;
	tif->tif_sizeproc = sizeproc;
	if (mapproc)
		tif->tif_mapproc = mapproc;
	else
		tif->tif_mapproc = _tiffDummyMapProc;
	if (unmapproc)
		tif->tif_unmapproc = unmapproc;
	else
		tif->tif_unmapproc = _tiffDummyUnmapProc;
	_TIFFSetDefaultCompressionState(tif);    /* setup default state */
	/*
	 * Default is to return data MSB2LSB and enable the
	 * use of memory-mapped files and strip chopping when
	 * a file is opened read-only.
	 */
	tif->tif_flags = FILLORDER_MSB2LSB;
	if (m == O_RDONLY )
		tif->tif_flags |= TIFF_MAPPED;

	#ifdef STRIPCHOP_DEFAULT
	if (m == O_RDONLY || m == O_RDWR)
		tif->tif_flags |= STRIPCHOP_DEFAULT;
	#endif

	/*
	 * Process library-specific flags in the open mode string.
	 * The following flags may be used to control intrinsic library
	 * behaviour that may or may not be desirable (usually for
	 * compatibility with some application that claims to support
	 * TIFF but only supports some braindead idea of what the
	 * vendor thinks TIFF is):
	 *
	 * 'l' use little-endian byte order for creating a file
	 * 'b' use big-endian byte order for creating a file
	 * 'L' read/write information using LSB2MSB bit order
	 * 'B' read/write information using MSB2LSB bit order
	 * 'H' read/write information using host bit order
	 * 'M' enable use of memory-mapped files when supported
	 * 'm' disable use of memory-mapped files
	 * 'C' enable strip chopping support when reading
	 * 'c' disable strip chopping support
	 * 'h' read TIFF header only, do not load the first IFD
	 * '4' ClassicTIFF for creating a file (default)
	 * '8' BigTIFF for creating a file
	 *
	 * The use of the 'l' and 'b' flags is strongly discouraged.
	 * These flags are provided solely because numerous vendors,
	 * typically on the PC, do not correctly support TIFF; they
	 * only support the Intel little-endian byte order.  This
	 * support is not configured by default because it supports
	 * the violation of the TIFF spec that says that readers *MUST*
	 * support both byte orders.  It is strongly recommended that
	 * you not use this feature except to deal with busted apps
	 * that write invalid TIFF.  And even in those cases you should
	 * bang on the vendors to fix their software.
	 *
	 * The 'L', 'B', and 'H' flags are intended for applications
	 * that can optimize operations on data by using a particular
	 * bit order.  By default the library returns data in MSB2LSB
	 * bit order for compatibiltiy with older versions of this
	 * library.  Returning data in the bit order of the native cpu
	 * makes the most sense but also requires applications to check
	 * the value of the FillOrder tag; something they probably do
	 * not do right now.
	 *
	 * The 'M' and 'm' flags are provided because some virtual memory
	 * systems exhibit poor behaviour when large images are mapped.
	 * These options permit clients to control the use of memory-mapped
	 * files on a per-file basis.
	 *
	 * The 'C' and 'c' flags are provided because the library support
	 * for chopping up large strips into multiple smaller strips is not
	 * application-transparent and as such can cause problems.  The 'c'
	 * option permits applications that only want to look at the tags,
	 * for example, to get the unadulterated TIFF tag information.
	 */
	for (cp = mode; *cp; cp++)
		switch (*cp) {
			case 'b':
				#ifndef WORDS_BIGENDIAN
				if (m&O_CREAT)
					tif->tif_flags |= TIFF_SWAB;
				#endif
				break;
			case 'l':
				#ifdef WORDS_BIGENDIAN
				if ((m&O_CREAT))
					tif->tif_flags |= TIFF_SWAB;
				#endif
				break;
			case 'B':
				tif->tif_flags = (tif->tif_flags &~ TIFF_FILLORDER) |
				    FILLORDER_MSB2LSB;
				break;
			case 'L':
				tif->tif_flags = (tif->tif_flags &~ TIFF_FILLORDER) |
				    FILLORDER_LSB2MSB;
				break;
			case 'H':
				tif->tif_flags = (tif->tif_flags &~ TIFF_FILLORDER) |
				    HOST_FILLORDER;
				break;
			case 'M':
				if (m == O_RDONLY)
					tif->tif_flags |= TIFF_MAPPED;
				break;
			case 'm':
				if (m == O_RDONLY)
					tif->tif_flags &= ~TIFF_MAPPED;
				break;
			case 'C':
				if (m == O_RDONLY)
					tif->tif_flags |= TIFF_STRIPCHOP;
				break;
			case 'c':
				if (m == O_RDONLY)
					tif->tif_flags &= ~TIFF_STRIPCHOP;
				break;
			case 'h':
				tif->tif_flags |= TIFF_HEADERONLY;
				break;
			case '8':
				if (m&O_CREAT)
					tif->tif_flags |= TIFF_BIGTIFF;
				break;
		}
	/*
	 * Read in TIFF header.
	 */
	if ((m & O_TRUNC) ||
	    !ReadOK(tif, &tif->tif_header, sizeof (TIFFHeaderClassic))) {
		if (tif->tif_mode == O_RDONLY) {
			TIFFErrorExt(tif->tif_clientdata, name,
			    "Cannot read TIFF header");
			goto bad;
		}
		/*
		 * Setup header and write.
		 */
		#ifdef WORDS_BIGENDIAN
		tif->tif_header.common.tiff_magic = tif->tif_flags & TIFF_SWAB
		    ? TIFF_LITTLEENDIAN : TIFF_BIGENDIAN;
		#else
		tif->tif_header.common.tiff_magic = tif->tif_flags & TIFF_SWAB
		    ? TIFF_BIGENDIAN : TIFF_LITTLEENDIAN;
		#endif
		if (!(tif->tif_flags&TIFF_BIGTIFF))
		{
			tif->tif_header.common.tiff_version = TIFF_VERSION_CLASSIC;
			tif->tif_header.classic.tiff_diroff = 0;
			if (tif->tif_flags & TIFF_SWAB)
				TIFFSwabShort(&tif->tif_header.common.tiff_version);
			tif->tif_header_size = sizeof(TIFFHeaderClassic);
		}
		else
		{
			tif->tif_header.common.tiff_version = TIFF_VERSION_BIG;
			tif->tif_header.big.tiff_offsetsize = 8;
			tif->tif_header.big.tiff_unused = 0;
			tif->tif_header.big.tiff_diroff = 0;
			if (tif->tif_flags & TIFF_SWAB)
			{
				TIFFSwabShort(&tif->tif_header.common.tiff_version);
				TIFFSwabShort(&tif->tif_header.big.tiff_offsetsize);
			}
			tif->tif_header_size = sizeof (TIFFHeaderBig);
		}
		/*
		 * The doc for "fopen" for some STD_C_LIBs says that if you
		 * open a file for modify ("+"), then you must fseek (or
		 * fflush?) between any freads and fwrites.  This is not
		 * necessary on most systems, but has been shown to be needed
		 * on Solaris.
		 */
		TIFFSeekFile( tif, 0, SEEK_SET );
		if (!WriteOK(tif, &tif->tif_header, (tmsize_t)(tif->tif_header_size))) {
			TIFFErrorExt(tif->tif_clientdata, name,
			    "Error writing TIFF header");
			goto bad;
		}
		/*
		 * Setup the byte order handling.
		 */
		if (tif->tif_header.common.tiff_magic == TIFF_BIGENDIAN) {
			#ifndef WORDS_BIGENDIAN
			tif->tif_flags |= TIFF_SWAB;
			#endif
		} else {
			#ifdef WORDS_BIGENDIAN
			tif->tif_flags |= TIFF_SWAB;
			#endif
		}
		/*
		 * Setup default directory.
		 */
		if (!TIFFDefaultDirectory(tif))
			goto bad;
		tif->tif_diroff = 0;
		tif->tif_dirlist = NULL;
		tif->tif_dirlistsize = 0;
		tif->tif_dirnumber = 0;
		return (tif);
	}
	/*
	 * Setup the byte order handling.
	 */
	if (tif->tif_header.common.tiff_magic != TIFF_BIGENDIAN &&
	    tif->tif_header.common.tiff_magic != TIFF_LITTLEENDIAN
	    #if MDI_SUPPORT
	    &&
	    #if HOST_BIGENDIAN
	    tif->tif_header.common.tiff_magic != MDI_BIGENDIAN
	    #else
	    tif->tif_header.common.tiff_magic != MDI_LITTLEENDIAN
	    #endif
	    ) {
		TIFFErrorExt(tif->tif_clientdata, name,
		    "Not a TIFF or MDI file, bad magic number %d (0x%x)",
	    #else
	    ) {
		TIFFErrorExt(tif->tif_clientdata, name,
		    "Not a TIFF file, bad magic number %d (0x%x)",
	    #endif
		    tif->tif_header.common.tiff_magic,
		    tif->tif_header.common.tiff_magic);
		goto bad;
	}
	if (tif->tif_header.common.tiff_magic == TIFF_BIGENDIAN) {
		#ifndef WORDS_BIGENDIAN
		tif->tif_flags |= TIFF_SWAB;
		#endif
	} else {
		#ifdef WORDS_BIGENDIAN
		tif->tif_flags |= TIFF_SWAB;
		#endif
	}
	if (tif->tif_flags & TIFF_SWAB) 
		TIFFSwabShort(&tif->tif_header.common.tiff_version);
	if ((tif->tif_header.common.tiff_version != TIFF_VERSION_CLASSIC)&&
	    (tif->tif_header.common.tiff_version != TIFF_VERSION_BIG)) {
		TIFFErrorExt(tif->tif_clientdata, name,
		    "Not a TIFF file, bad version number %d (0x%x)",
		    tif->tif_header.common.tiff_version,
		    tif->tif_header.common.tiff_version);
		goto bad;
	}
	if (tif->tif_header.common.tiff_version == TIFF_VERSION_CLASSIC)
	{
		if (tif->tif_flags & TIFF_SWAB)
			TIFFSwabLong(&tif->tif_header.classic.tiff_diroff);
		tif->tif_header_size = sizeof(TIFFHeaderClassic);
	}
	else
	{
		if (!ReadOK(tif, ((uint8*)(&tif->tif_header) + sizeof(TIFFHeaderClassic)), (sizeof(TIFFHeaderBig)-sizeof(TIFFHeaderClassic))))
		{
			TIFFErrorExt(tif->tif_clientdata, name,
			    "Cannot read TIFF header");
			goto bad;
		}
		if (tif->tif_flags & TIFF_SWAB)
		{
			TIFFSwabShort(&tif->tif_header.big.tiff_offsetsize);
			TIFFSwabLong8(&tif->tif_header.big.tiff_diroff);
		}
		if (tif->tif_header.big.tiff_offsetsize != 8)
		{
			TIFFErrorExt(tif->tif_clientdata, name,
			    "Not a TIFF file, bad BigTIFF offsetsize %d (0x%x)",
			    tif->tif_header.big.tiff_offsetsize,
			    tif->tif_header.big.tiff_offsetsize);
			goto bad;
		}
		if (tif->tif_header.big.tiff_unused != 0)
		{
			TIFFErrorExt(tif->tif_clientdata, name,
			    "Not a TIFF file, bad BigTIFF unused %d (0x%x)",
			    tif->tif_header.big.tiff_unused,
			    tif->tif_header.big.tiff_unused);
			goto bad;
		}
		tif->tif_header_size = sizeof(TIFFHeaderBig);
		tif->tif_flags |= TIFF_BIGTIFF;
	}
	tif->tif_flags |= TIFF_MYBUFFER;
	tif->tif_rawcp = tif->tif_rawdata = 0;
	tif->tif_rawdatasize = 0;
        tif->tif_rawdataoff = 0;
        tif->tif_rawdataloaded = 0;

	switch (mode[0]) {
		case 'r':
			if (!(tif->tif_flags&TIFF_BIGTIFF))
				tif->tif_nextdiroff = tif->tif_header.classic.tiff_diroff;
			else
				tif->tif_nextdiroff = tif->tif_header.big.tiff_diroff;
			/*
			 * Try to use a memory-mapped file if the client
			 * has not explicitly suppressed usage with the
			 * 'm' flag in the open mode (see above).
			 */
			if (tif->tif_flags & TIFF_MAPPED)
			{
				toff_t n;
				if (TIFFMapFileContents(tif,(void**)(&tif->tif_base),&n))
				{
					tif->tif_size=(tmsize_t)n;
					assert((toff_t)tif->tif_size==n);
				}
				else
					tif->tif_flags &= ~TIFF_MAPPED;
			}
			/*
			 * Sometimes we do not want to read the first directory (for example,
			 * it may be broken) and want to proceed to other directories. I this
			 * case we use the TIFF_HEADERONLY flag to open file and return
			 * immediately after reading TIFF header.
			 */
			if (tif->tif_flags & TIFF_HEADERONLY)
				return (tif);

			/*
			 * Setup initial directory.
			 */
			if (TIFFReadDirectory(tif)) {
				tif->tif_rawcc = (tmsize_t)-1;
				tif->tif_flags |= TIFF_BUFFERSETUP;
				return (tif);
			}
			break;
		case 'a':
			/*
			 * New directories are automatically append
			 * to the end of the directory chain when they
			 * are written out (see TIFFWriteDirectory).
			 */
			if (!TIFFDefaultDirectory(tif))
				goto bad;
			return (tif);
	}
bad:
	tif->tif_mode = O_RDONLY;	/* XXX avoid flush */
        TIFFCleanup(tif);
bad2:
	return ((TIFF*)0);
}

/*
 * Query functions to access private data.
 */

/*
 * Return open file's name.
 */
const char *
TIFFFileName(TIFF* tif)
{
	return (tif->tif_name);
}

/*
 * Set the file name.
 */
const char *
TIFFSetFileName(TIFF* tif, const char *name)
{
	const char* old_name = tif->tif_name;
	tif->tif_name = (char *)name;
	return (old_name);
}

/*
 * Return open file's I/O descriptor.
 */
int
TIFFFileno(TIFF* tif)
{
	return (tif->tif_fd);
}

/*
 * Set open file's I/O descriptor, and return previous value.
 */
int
TIFFSetFileno(TIFF* tif, int fd)
{
        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.
 */
uint16
TIFFCurrentDirectory(TIFF* tif)
{
	return (tif->tif_curdir);
}

/*
 * Return current strip.
 */
uint32
TIFFCurrentStrip(TIFF* tif)
{
	return (tif->tif_curstrip);
}

/*
 * Return current tile.
 */
uint32
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.common.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:
 */
Commit	Line	Data
8414a40c VZ	1
	2	/*
	3	* Copyright (c) 1988-1997 Sam Leffler
	4	* Copyright (c) 1991-1997 Silicon Graphics, Inc.
	5	*
	6	* Permission to use, copy, modify, distribute, and sell this software and
	7	* its documentation for any purpose is hereby granted without fee, provided
	8	* that (i) the above copyright notices and this permission notice appear in
	9	* all copies of the software and related documentation, and (ii) the names of
	10	* Sam Leffler and Silicon Graphics may not be used in any advertising or
	11	* publicity relating to the software without the specific, prior written
	12	* permission of Sam Leffler and Silicon Graphics.
	13	*
	14	* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
	15	* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
	16	* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
	17	*
	18	* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
	19	* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
	20	* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
	21	* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
	22	* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
	23	* OF THIS SOFTWARE.
	24	*/
	25
	26	/*
	27	* TIFF Library.
	28	*/
	29	#include "tiffiop.h"
	30
8414a40c VZ	31	/*
	32	* Dummy functions to fill the omitted client procedures.
	33	*/
	34	static int
80ed523f	35	_tiffDummyMapProc(thandle_t fd, void** pbase, toff_t* psize)
8414a40c VZ	36	{
	37	(void) fd; (void) pbase; (void) psize;
	38	return (0);
	39	}
	40
	41	static void
80ed523f	42	_tiffDummyUnmapProc(thandle_t fd, void* base, toff_t size)
8414a40c VZ	43	{
	44	(void) fd; (void) base; (void) size;
	45	}
	46
8414a40c VZ	47	int
	48	_TIFFgetMode(const char* mode, const char* module)
	49	{
	50	int m = -1;
	51
	52	switch (mode[0]) {
	53	case 'r':
	54	m = O_RDONLY;
	55	if (mode[1] == '+')
	56	m = O_RDWR;
	57	break;
	58	case 'w':
	59	case 'a':
	60	m = O_RDWR\|O_CREAT;
	61	if (mode[0] == 'w')
	62	m \|= O_TRUNC;
	63	break;
	64	default:
	65	TIFFErrorExt(0, module, "\"%s\": Bad mode", mode);
	66	break;
	67	}
	68	return (m);
	69	}
	70
	71	TIFF*
	72	TIFFClientOpen(
	73	const char* name, const char* mode,
	74	thandle_t clientdata,
	75	TIFFReadWriteProc readproc,
	76	TIFFReadWriteProc writeproc,
	77	TIFFSeekProc seekproc,
	78	TIFFCloseProc closeproc,
	79	TIFFSizeProc sizeproc,
	80	TIFFMapFileProc mapproc,
	81	TIFFUnmapFileProc unmapproc
	82	)
	83	{
	84	static const char module[] = "TIFFClientOpen";
	85	TIFF *tif;
	86	int m;
	87	const char* cp;
	88
80ed523f VZ	89	/* The following are configuration checks. They should be redundant, but should not
	90	* compile to any actual code in an optimised release build anyway. If any of them
	91	* fail, (makefile-based or other) configuration is not correct */
	92	assert(sizeof(uint8)==1);
	93	assert(sizeof(int8)==1);
	94	assert(sizeof(uint16)==2);
	95	assert(sizeof(int16)==2);
	96	assert(sizeof(uint32)==4);
	97	assert(sizeof(int32)==4);
	98	assert(sizeof(uint64)==8);
	99	assert(sizeof(int64)==8);
	100	assert(sizeof(tmsize_t)==sizeof(void*));
	101	{
	102	union{
	103	uint8 a8[2];
	104	uint16 a16;
	105	} n;
	106	n.a8[0]=1;
	107	n.a8[1]=0;
	108	#ifdef WORDS_BIGENDIAN
	109	assert(n.a16==256);
	110	#else
	111	assert(n.a16==1);
	112	#endif
	113	}
	114
8414a40c VZ	115	m = _TIFFgetMode(mode, module);
	116	if (m == -1)
	117	goto bad2;
80ed523f	118	tif = (TIFF *)_TIFFmalloc((tmsize_t)(sizeof (TIFF) + strlen(name) + 1));
8414a40c VZ	119	if (tif == NULL) {
	120	TIFFErrorExt(clientdata, module, "%s: Out of memory (TIFF structure)", name);
	121	goto bad2;
	122	}
	123	_TIFFmemset(tif, 0, sizeof (*tif));
	124	tif->tif_name = (char *)tif + sizeof (TIFF);
	125	strcpy(tif->tif_name, name);
	126	tif->tif_mode = m &~ (O_CREAT\|O_TRUNC);
80ed523f	127	tif->tif_curdir = (uint16) -1; /* non-existent directory */
8414a40c	128	tif->tif_curoff = 0;
80ed523f	129	tif->tif_curstrip = (uint32) -1; /* invalid strip */
8414a40c VZ	130	tif->tif_row = (uint32) -1; /* read/write pre-increment */
	131	tif->tif_clientdata = clientdata;
	132	if (!readproc \|\| !writeproc \|\| !seekproc \|\| !closeproc \|\| !sizeproc) {
	133	TIFFErrorExt(clientdata, module,
80ed523f	134	"One of the client procedures is NULL pointer.");
8414a40c VZ	135	goto bad2;
	136	}
	137	tif->tif_readproc = readproc;
	138	tif->tif_writeproc = writeproc;
	139	tif->tif_seekproc = seekproc;
	140	tif->tif_closeproc = closeproc;
	141	tif->tif_sizeproc = sizeproc;
80ed523f	142	if (mapproc)
8414a40c VZ	143	tif->tif_mapproc = mapproc;
	144	else
	145	tif->tif_mapproc = _tiffDummyMapProc;
	146	if (unmapproc)
	147	tif->tif_unmapproc = unmapproc;
	148	else
	149	tif->tif_unmapproc = _tiffDummyUnmapProc;
80ed523f	150	_TIFFSetDefaultCompressionState(tif); /* setup default state */
8414a40c VZ	151	/*
	152	* Default is to return data MSB2LSB and enable the
	153	* use of memory-mapped files and strip chopping when
	154	* a file is opened read-only.
	155	*/
	156	tif->tif_flags = FILLORDER_MSB2LSB;
	157	if (m == O_RDONLY )
80ed523f	158	tif->tif_flags \|= TIFF_MAPPED;
8414a40c	159
80ed523f	160	#ifdef STRIPCHOP_DEFAULT
8414a40c VZ	161	if (m == O_RDONLY \|\| m == O_RDWR)
8414a40c VZ	162	tif->tif_flags \|= STRIPCHOP_DEFAULT;
80ed523f	163	#endif
8414a40c VZ	164
	165	/*
	166	* Process library-specific flags in the open mode string.
	167	* The following flags may be used to control intrinsic library
	168	* behaviour that may or may not be desirable (usually for
	169	* compatibility with some application that claims to support
	170	* TIFF but only supports some braindead idea of what the
	171	* vendor thinks TIFF is):
	172	*
80ed523f VZ	173	* 'l' use little-endian byte order for creating a file
	174	* 'b' use big-endian byte order for creating a file
	175	* 'L' read/write information using LSB2MSB bit order
	176	* 'B' read/write information using MSB2LSB bit order
	177	* 'H' read/write information using host bit order
	178	* 'M' enable use of memory-mapped files when supported
	179	* 'm' disable use of memory-mapped files
	180	* 'C' enable strip chopping support when reading
	181	* 'c' disable strip chopping support
	182	* 'h' read TIFF header only, do not load the first IFD
	183	* '4' ClassicTIFF for creating a file (default)
	184	* '8' BigTIFF for creating a file
8414a40c VZ	185	*
	186	* The use of the 'l' and 'b' flags is strongly discouraged.
	187	* These flags are provided solely because numerous vendors,
	188	* typically on the PC, do not correctly support TIFF; they
	189	* only support the Intel little-endian byte order. This
	190	* support is not configured by default because it supports
	191	* the violation of the TIFF spec that says that readers MUST
	192	* support both byte orders. It is strongly recommended that
	193	* you not use this feature except to deal with busted apps
	194	* that write invalid TIFF. And even in those cases you should
	195	* bang on the vendors to fix their software.
	196	*
	197	* The 'L', 'B', and 'H' flags are intended for applications
	198	* that can optimize operations on data by using a particular
	199	* bit order. By default the library returns data in MSB2LSB
	200	* bit order for compatibiltiy with older versions of this
	201	* library. Returning data in the bit order of the native cpu
	202	* makes the most sense but also requires applications to check
	203	* the value of the FillOrder tag; something they probably do
	204	* not do right now.
	205	*
	206	* The 'M' and 'm' flags are provided because some virtual memory
	207	* systems exhibit poor behaviour when large images are mapped.
	208	* These options permit clients to control the use of memory-mapped
	209	* files on a per-file basis.
	210	*
	211	* The 'C' and 'c' flags are provided because the library support
	212	* for chopping up large strips into multiple smaller strips is not
	213	* application-transparent and as such can cause problems. The 'c'
	214	* option permits applications that only want to look at the tags,
	215	* for example, to get the unadulterated TIFF tag information.
	216	*/
	217	for (cp = mode; *cp; cp++)
	218	switch (*cp) {
80ed523f VZ	219	case 'b':
	220	#ifndef WORDS_BIGENDIAN
	221	if (m&O_CREAT)
	222	tif->tif_flags \|= TIFF_SWAB;
	223	#endif
	224	break;
	225	case 'l':
	226	#ifdef WORDS_BIGENDIAN
	227	if ((m&O_CREAT))
	228	tif->tif_flags \|= TIFF_SWAB;
	229	#endif
	230	break;
	231	case 'B':
	232	tif->tif_flags = (tif->tif_flags &~ TIFF_FILLORDER) \|
	233	FILLORDER_MSB2LSB;
	234	break;
	235	case 'L':
	236	tif->tif_flags = (tif->tif_flags &~ TIFF_FILLORDER) \|
	237	FILLORDER_LSB2MSB;
	238	break;
	239	case 'H':
	240	tif->tif_flags = (tif->tif_flags &~ TIFF_FILLORDER) \|
	241	HOST_FILLORDER;
	242	break;
	243	case 'M':
	244	if (m == O_RDONLY)
	245	tif->tif_flags \|= TIFF_MAPPED;
	246	break;
	247	case 'm':
	248	if (m == O_RDONLY)
	249	tif->tif_flags &= ~TIFF_MAPPED;
	250	break;
	251	case 'C':
	252	if (m == O_RDONLY)
	253	tif->tif_flags \|= TIFF_STRIPCHOP;
	254	break;
	255	case 'c':
	256	if (m == O_RDONLY)
	257	tif->tif_flags &= ~TIFF_STRIPCHOP;
	258	break;
	259	case 'h':
	260	tif->tif_flags \|= TIFF_HEADERONLY;
	261	break;
	262	case '8':
	263	if (m&O_CREAT)
	264	tif->tif_flags \|= TIFF_BIGTIFF;
	265	break;
8414a40c VZ	266	}
	267	/*
	268	* Read in TIFF header.
	269	*/
80ed523f VZ	270	if ((m & O_TRUNC) \|\|
80ed523f VZ	271	!ReadOK(tif, &tif->tif_header, sizeof (TIFFHeaderClassic))) {
8414a40c	272	if (tif->tif_mode == O_RDONLY) {
80ed523f VZ	273	TIFFErrorExt(tif->tif_clientdata, name,
80ed523f VZ	274	"Cannot read TIFF header");
8414a40c VZ	275	goto bad;
	276	}
	277	/*
	278	* Setup header and write.
	279	*/
80ed523f VZ	280	#ifdef WORDS_BIGENDIAN
80ed523f VZ	281	tif->tif_header.common.tiff_magic = tif->tif_flags & TIFF_SWAB
8414a40c	282	? TIFF_LITTLEENDIAN : TIFF_BIGENDIAN;
80ed523f VZ	283	#else
80ed523f VZ	284	tif->tif_header.common.tiff_magic = tif->tif_flags & TIFF_SWAB
8414a40c	285	? TIFF_BIGENDIAN : TIFF_LITTLEENDIAN;
80ed523f VZ	286	#endif
	287	if (!(tif->tif_flags&TIFF_BIGTIFF))
	288	{
	289	tif->tif_header.common.tiff_version = TIFF_VERSION_CLASSIC;
	290	tif->tif_header.classic.tiff_diroff = 0;
	291	if (tif->tif_flags & TIFF_SWAB)
	292	TIFFSwabShort(&tif->tif_header.common.tiff_version);
	293	tif->tif_header_size = sizeof(TIFFHeaderClassic);
	294	}
	295	else
	296	{
	297	tif->tif_header.common.tiff_version = TIFF_VERSION_BIG;
	298	tif->tif_header.big.tiff_offsetsize = 8;
	299	tif->tif_header.big.tiff_unused = 0;
	300	tif->tif_header.big.tiff_diroff = 0;
	301	if (tif->tif_flags & TIFF_SWAB)
	302	{
	303	TIFFSwabShort(&tif->tif_header.common.tiff_version);
	304	TIFFSwabShort(&tif->tif_header.big.tiff_offsetsize);
	305	}
	306	tif->tif_header_size = sizeof (TIFFHeaderBig);
	307	}
	308	/*
	309	* The doc for "fopen" for some STD_C_LIBs says that if you
	310	* open a file for modify ("+"), then you must fseek (or
	311	* fflush?) between any freads and fwrites. This is not
	312	* necessary on most systems, but has been shown to be needed
	313	* on Solaris.
	314	*/
	315	TIFFSeekFile( tif, 0, SEEK_SET );
	316	if (!WriteOK(tif, &tif->tif_header, (tmsize_t)(tif->tif_header_size))) {
	317	TIFFErrorExt(tif->tif_clientdata, name,
	318	"Error writing TIFF header");
8414a40c VZ	319	goto bad;
	320	}
	321	/*
	322	* Setup the byte order handling.
	323	*/
80ed523f VZ	324	if (tif->tif_header.common.tiff_magic == TIFF_BIGENDIAN) {
	325	#ifndef WORDS_BIGENDIAN
	326	tif->tif_flags \|= TIFF_SWAB;
	327	#endif
	328	} else {
	329	#ifdef WORDS_BIGENDIAN
	330	tif->tif_flags \|= TIFF_SWAB;
	331	#endif
	332	}
8414a40c VZ	333	/*
	334	* Setup default directory.
	335	*/
	336	if (!TIFFDefaultDirectory(tif))
	337	goto bad;
	338	tif->tif_diroff = 0;
	339	tif->tif_dirlist = NULL;
80ed523f	340	tif->tif_dirlistsize = 0;
8414a40c VZ	341	tif->tif_dirnumber = 0;
	342	return (tif);
	343	}
	344	/*
	345	* Setup the byte order handling.
	346	*/
80ed523f VZ	347	if (tif->tif_header.common.tiff_magic != TIFF_BIGENDIAN &&
	348	tif->tif_header.common.tiff_magic != TIFF_LITTLEENDIAN
	349	#if MDI_SUPPORT
8414a40c	350	&&
80ed523f VZ	351	#if HOST_BIGENDIAN
	352	tif->tif_header.common.tiff_magic != MDI_BIGENDIAN
	353	#else
	354	tif->tif_header.common.tiff_magic != MDI_LITTLEENDIAN
	355	#endif
8414a40c	356	) {
80ed523f VZ	357	TIFFErrorExt(tif->tif_clientdata, name,
	358	"Not a TIFF or MDI file, bad magic number %d (0x%x)",
	359	#else
8414a40c	360	) {
8414a40c	361	TIFFErrorExt(tif->tif_clientdata, name,
80ed523f VZ	362	"Not a TIFF file, bad magic number %d (0x%x)",
	363	#endif
	364	tif->tif_header.common.tiff_magic,
	365	tif->tif_header.common.tiff_magic);
8414a40c VZ	366	goto bad;
8414a40c VZ	367	}
80ed523f VZ	368	if (tif->tif_header.common.tiff_magic == TIFF_BIGENDIAN) {
	369	#ifndef WORDS_BIGENDIAN
	370	tif->tif_flags \|= TIFF_SWAB;
	371	#endif
	372	} else {
	373	#ifdef WORDS_BIGENDIAN
	374	tif->tif_flags \|= TIFF_SWAB;
	375	#endif
	376	}
	377	if (tif->tif_flags & TIFF_SWAB)
	378	TIFFSwabShort(&tif->tif_header.common.tiff_version);
	379	if ((tif->tif_header.common.tiff_version != TIFF_VERSION_CLASSIC)&&
	380	(tif->tif_header.common.tiff_version != TIFF_VERSION_BIG)) {
8414a40c VZ	381	TIFFErrorExt(tif->tif_clientdata, name,
8414a40c VZ	382	"Not a TIFF file, bad version number %d (0x%x)",
80ed523f VZ	383	tif->tif_header.common.tiff_version,
80ed523f VZ	384	tif->tif_header.common.tiff_version);
8414a40c VZ	385	goto bad;
8414a40c VZ	386	}
80ed523f VZ	387	if (tif->tif_header.common.tiff_version == TIFF_VERSION_CLASSIC)
	388	{
	389	if (tif->tif_flags & TIFF_SWAB)
	390	TIFFSwabLong(&tif->tif_header.classic.tiff_diroff);
	391	tif->tif_header_size = sizeof(TIFFHeaderClassic);
	392	}
	393	else
	394	{
	395	if (!ReadOK(tif, ((uint8*)(&tif->tif_header) + sizeof(TIFFHeaderClassic)), (sizeof(TIFFHeaderBig)-sizeof(TIFFHeaderClassic))))
	396	{
	397	TIFFErrorExt(tif->tif_clientdata, name,
	398	"Cannot read TIFF header");
	399	goto bad;
	400	}
	401	if (tif->tif_flags & TIFF_SWAB)
	402	{
	403	TIFFSwabShort(&tif->tif_header.big.tiff_offsetsize);
	404	TIFFSwabLong8(&tif->tif_header.big.tiff_diroff);
	405	}
	406	if (tif->tif_header.big.tiff_offsetsize != 8)
	407	{
	408	TIFFErrorExt(tif->tif_clientdata, name,
	409	"Not a TIFF file, bad BigTIFF offsetsize %d (0x%x)",
	410	tif->tif_header.big.tiff_offsetsize,
	411	tif->tif_header.big.tiff_offsetsize);
	412	goto bad;
	413	}
	414	if (tif->tif_header.big.tiff_unused != 0)
	415	{
	416	TIFFErrorExt(tif->tif_clientdata, name,
	417	"Not a TIFF file, bad BigTIFF unused %d (0x%x)",
	418	tif->tif_header.big.tiff_unused,
	419	tif->tif_header.big.tiff_unused);
	420	goto bad;
	421	}
	422	tif->tif_header_size = sizeof(TIFFHeaderBig);
	423	tif->tif_flags \|= TIFF_BIGTIFF;
	424	}
8414a40c VZ	425	tif->tif_flags \|= TIFF_MYBUFFER;
	426	tif->tif_rawcp = tif->tif_rawdata = 0;
	427	tif->tif_rawdatasize = 0;
80ed523f VZ	428	tif->tif_rawdataoff = 0;
80ed523f VZ	429	tif->tif_rawdataloaded = 0;
8414a40c	430
8414a40c	431	switch (mode[0]) {
80ed523f VZ	432	case 'r':
	433	if (!(tif->tif_flags&TIFF_BIGTIFF))
	434	tif->tif_nextdiroff = tif->tif_header.classic.tiff_diroff;
	435	else
	436	tif->tif_nextdiroff = tif->tif_header.big.tiff_diroff;
	437	/*
	438	* Try to use a memory-mapped file if the client
	439	* has not explicitly suppressed usage with the
	440	* 'm' flag in the open mode (see above).
	441	*/
	442	if (tif->tif_flags & TIFF_MAPPED)
	443	{
	444	toff_t n;
	445	if (TIFFMapFileContents(tif,(void**)(&tif->tif_base),&n))
	446	{
	447	tif->tif_size=(tmsize_t)n;
	448	assert((toff_t)tif->tif_size==n);
	449	}
	450	else
	451	tif->tif_flags &= ~TIFF_MAPPED;
	452	}
	453	/*
	454	* Sometimes we do not want to read the first directory (for example,
	455	* it may be broken) and want to proceed to other directories. I this
	456	* case we use the TIFF_HEADERONLY flag to open file and return
	457	* immediately after reading TIFF header.
	458	*/
	459	if (tif->tif_flags & TIFF_HEADERONLY)
	460	return (tif);
	461
	462	/*
	463	* Setup initial directory.
	464	*/
	465	if (TIFFReadDirectory(tif)) {
	466	tif->tif_rawcc = (tmsize_t)-1;
	467	tif->tif_flags \|= TIFF_BUFFERSETUP;
	468	return (tif);
	469	}
	470	break;
	471	case 'a':
	472	/*
	473	* New directories are automatically append
	474	* to the end of the directory chain when they
	475	* are written out (see TIFFWriteDirectory).
	476	*/
	477	if (!TIFFDefaultDirectory(tif))
	478	goto bad;
8414a40c	479	return (tif);
8414a40c VZ	480	}
	481	bad:
	482	tif->tif_mode = O_RDONLY; /* XXX avoid flush */
	483	TIFFCleanup(tif);
	484	bad2:
	485	return ((TIFF*)0);
	486	}
	487
	488	/*
	489	* Query functions to access private data.
	490	*/
	491
	492	/*
	493	* Return open file's name.
	494	*/
	495	const char *
	496	TIFFFileName(TIFF* tif)
	497	{
	498	return (tif->tif_name);
	499	}
	500
	501	/*
	502	* Set the file name.
	503	*/
	504	const char *
	505	TIFFSetFileName(TIFF* tif, const char *name)
	506	{
	507	const char* old_name = tif->tif_name;
	508	tif->tif_name = (char *)name;
	509	return (old_name);
	510	}
	511
	512	/*
	513	* Return open file's I/O descriptor.
	514	*/
	515	int
	516	TIFFFileno(TIFF* tif)
	517	{
	518	return (tif->tif_fd);
	519	}
	520
	521	/*
	522	* Set open file's I/O descriptor, and return previous value.
	523	*/
	524	int
	525	TIFFSetFileno(TIFF* tif, int fd)
	526	{
	527	int old_fd = tif->tif_fd;
	528	tif->tif_fd = fd;
	529	return old_fd;
	530	}
	531
	532	/*
	533	* Return open file's clientdata.
	534	*/
	535	thandle_t
	536	TIFFClientdata(TIFF* tif)
	537	{
	538	return (tif->tif_clientdata);
	539	}
	540
	541	/*
	542	* Set open file's clientdata, and return previous value.
	543	*/
544	thandle_t
545	TIFFSetClientdata(TIFF* tif, thandle_t newvalue)
546	{
547	thandle_t m = tif->tif_clientdata;
548	tif->tif_clientdata = newvalue;
549	return m;
550	}
551
552	/*
553	* Return read/write mode.
554	*/
555	int
556	TIFFGetMode(TIFF* tif)
557	{
558	return (tif->tif_mode);
559	}
560
561	/*
562	* Return read/write mode.
563	*/
564	int
565	TIFFSetMode(TIFF* tif, int mode)
566	{
567	int old_mode = tif->tif_mode;
568	tif->tif_mode = mode;
569	return (old_mode);
570	}
571
572	/*
573	* Return nonzero if file is organized in
574	* tiles; zero if organized as strips.
575	*/
576	int
577	TIFFIsTiled(TIFF* tif)
578	{
579	return (isTiled(tif));
580	}
581
582	/*
583	* Return current row being read/written.
584	*/
585	uint32
586	TIFFCurrentRow(TIFF* tif)
587	{
588	return (tif->tif_row);
589	}
590
591	/*
592	* Return index of the current directory.
593	*/
80ed523f	594	uint16
8414a40c VZ	595	TIFFCurrentDirectory(TIFF* tif)
	596	{
	597	return (tif->tif_curdir);
	598	}
	599
	600	/*
	601	* Return current strip.
	602	*/
80ed523f	603	uint32
8414a40c VZ	604	TIFFCurrentStrip(TIFF* tif)
	605	{
	606	return (tif->tif_curstrip);
	607	}
	608
	609	/*
	610	* Return current tile.
	611	*/
80ed523f	612	uint32
8414a40c VZ	613	TIFFCurrentTile(TIFF* tif)
	614	{
	615	return (tif->tif_curtile);
	616	}
	617
	618	/*
	619	* Return nonzero if the file has byte-swapped data.
	620	*/
	621	int
	622	TIFFIsByteSwapped(TIFF* tif)
	623	{
	624	return ((tif->tif_flags & TIFF_SWAB) != 0);
	625	}
	626
	627	/*
	628	* Return nonzero if the data is returned up-sampled.
	629	*/
	630	int
	631	TIFFIsUpSampled(TIFF* tif)
	632	{
	633	return (isUpSampled(tif));
	634	}
	635
	636	/*
	637	* Return nonzero if the data is returned in MSB-to-LSB bit order.
	638	*/
	639	int
	640	TIFFIsMSB2LSB(TIFF* tif)
	641	{
	642	return (isFillOrder(tif, FILLORDER_MSB2LSB));
	643	}
	644
	645	/*
	646	* Return nonzero if given file was written in big-endian order.
	647	*/
	648	int
	649	TIFFIsBigEndian(TIFF* tif)
	650	{
80ed523f	651	return (tif->tif_header.common.tiff_magic == TIFF_BIGENDIAN);
8414a40c VZ	652	}
	653
	654	/*
	655	* Return pointer to file read method.
	656	*/
	657	TIFFReadWriteProc
	658	TIFFGetReadProc(TIFF* tif)
	659	{
	660	return (tif->tif_readproc);
	661	}
	662
	663	/*
	664	* Return pointer to file write method.
	665	*/
	666	TIFFReadWriteProc
	667	TIFFGetWriteProc(TIFF* tif)
	668	{
	669	return (tif->tif_writeproc);
	670	}
	671
	672	/*
	673	* Return pointer to file seek method.
	674	*/
	675	TIFFSeekProc
	676	TIFFGetSeekProc(TIFF* tif)
	677	{
	678	return (tif->tif_seekproc);
	679	}
	680
	681	/*
	682	* Return pointer to file close method.
	683	*/
	684	TIFFCloseProc
	685	TIFFGetCloseProc(TIFF* tif)
	686	{
	687	return (tif->tif_closeproc);
	688	}
	689
	690	/*
	691	* Return pointer to file size requesting method.
	692	*/
	693	TIFFSizeProc
	694	TIFFGetSizeProc(TIFF* tif)
	695	{
	696	return (tif->tif_sizeproc);
	697	}
	698
	699	/*
	700	* Return pointer to memory mapping method.
	701	*/
	702	TIFFMapFileProc
	703	TIFFGetMapFileProc(TIFF* tif)
	704	{
	705	return (tif->tif_mapproc);
	706	}
	707
	708	/*
	709	* Return pointer to memory unmapping method.
	710	*/
	711	TIFFUnmapFileProc
	712	TIFFGetUnmapFileProc(TIFF* tif)
	713	{
	714	return (tif->tif_unmapproc);
	715	}
716
717	/* vim: set ts=8 sts=8 sw=8 noet: */
80ed523f VZ	718	/*
	719	* Local Variables:
	720	* mode: c
	721	* c-basic-offset: 8
	722	* fill-column: 78
	723	* End:
	724	*/