+++ /dev/null
-/* $Id: tif_open.c,v 1.1 2005/06/17 13:54:52 vp153 Exp $ */
-
-/*
- * 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"
-
-void _TIFFSetDefaultCompressionState(TIFF* tif);
-
-static const long typemask[13] = {
- (long)0L, /* TIFF_NOTYPE */
- (long)0x000000ffL, /* TIFF_BYTE */
- (long)0xffffffffL, /* TIFF_ASCII */
- (long)0x0000ffffL, /* TIFF_SHORT */
- (long)0xffffffffL, /* TIFF_LONG */
- (long)0xffffffffL, /* TIFF_RATIONAL */
- (long)0x000000ffL, /* TIFF_SBYTE */
- (long)0x000000ffL, /* TIFF_UNDEFINED */
- (long)0x0000ffffL, /* TIFF_SSHORT */
- (long)0xffffffffL, /* TIFF_SLONG */
- (long)0xffffffffL, /* TIFF_SRATIONAL */
- (long)0xffffffffL, /* TIFF_FLOAT */
- (long)0xffffffffL, /* TIFF_DOUBLE */
-};
-static const int bigTypeshift[13] = {
- 0, /* TIFF_NOTYPE */
- 24, /* TIFF_BYTE */
- 0, /* TIFF_ASCII */
- 16, /* TIFF_SHORT */
- 0, /* TIFF_LONG */
- 0, /* TIFF_RATIONAL */
- 24, /* TIFF_SBYTE */
- 24, /* TIFF_UNDEFINED */
- 16, /* TIFF_SSHORT */
- 0, /* TIFF_SLONG */
- 0, /* TIFF_SRATIONAL */
- 0, /* TIFF_FLOAT */
- 0, /* TIFF_DOUBLE */
-};
-static const int litTypeshift[13] = {
- 0, /* TIFF_NOTYPE */
- 0, /* TIFF_BYTE */
- 0, /* TIFF_ASCII */
- 0, /* TIFF_SHORT */
- 0, /* TIFF_LONG */
- 0, /* TIFF_RATIONAL */
- 0, /* TIFF_SBYTE */
- 0, /* TIFF_UNDEFINED */
- 0, /* TIFF_SSHORT */
- 0, /* TIFF_SLONG */
- 0, /* TIFF_SRATIONAL */
- 0, /* TIFF_FLOAT */
- 0, /* TIFF_DOUBLE */
-};
-
-/*
- * Dummy functions to fill the omitted client procedures.
- */
-static int
-_tiffDummyMapProc(thandle_t fd, tdata_t* pbase, toff_t* psize)
-{
- return (0);
-}
-
-static void
-_tiffDummyUnmapProc(thandle_t fd, tdata_t base, toff_t size)
-{
-}
-
-/*
- * Initialize the shift & mask tables, and the
- * byte swapping state according to the file
- * contents and the machine architecture.
- */
-static void
-TIFFInitOrder(TIFF* tif, int magic, int bigendian)
-{
- tif->tif_typemask = typemask;
- if (magic == TIFF_BIGENDIAN) {
- tif->tif_typeshift = bigTypeshift;
- if (!bigendian)
- tif->tif_flags |= TIFF_SWAB;
- } else {
- tif->tif_typeshift = litTypeshift;
- if (bigendian)
- tif->tif_flags |= TIFF_SWAB;
- }
-}
-
-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:
- TIFFError(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, bigendian;
- const char* cp;
-
- m = _TIFFgetMode(mode, module);
- if (m == -1)
- goto bad2;
- tif = (TIFF *)_TIFFmalloc(sizeof (TIFF) + strlen(name) + 1);
- if (tif == NULL) {
- TIFFError(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 = (tdir_t) -1; /* non-existent directory */
- tif->tif_curoff = 0;
- tif->tif_curstrip = (tstrip_t) -1; /* invalid strip */
- tif->tif_row = (uint32) -1; /* read/write pre-increment */
- tif->tif_clientdata = clientdata;
- if (!readproc || !writeproc || !seekproc || !closeproc || !sizeproc) {
- TIFFError(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
-
- { union { int32 i; char c[4]; } u; u.i = 1; bigendian = u.c[0] == 0; }
- /*
- * 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
- *
- * 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':
- if ((m&O_CREAT) && !bigendian)
- tif->tif_flags |= TIFF_SWAB;
- break;
- case 'l':
- if ((m&O_CREAT) && bigendian)
- tif->tif_flags |= TIFF_SWAB;
- 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;
- }
- /*
- * Read in TIFF header.
- */
- if (!ReadOK(tif, &tif->tif_header, sizeof (TIFFHeader))) {
- if (tif->tif_mode == O_RDONLY) {
- TIFFError(name, "Cannot read TIFF header");
- goto bad;
- }
- /*
- * Setup header and write.
- */
- tif->tif_header.tiff_magic = tif->tif_flags & TIFF_SWAB
- ? (bigendian ? TIFF_LITTLEENDIAN : TIFF_BIGENDIAN)
- : (bigendian ? TIFF_BIGENDIAN : TIFF_LITTLEENDIAN);
- tif->tif_header.tiff_version = TIFF_VERSION;
- if (tif->tif_flags & TIFF_SWAB)
- TIFFSwabShort(&tif->tif_header.tiff_version);
- tif->tif_header.tiff_diroff = 0; /* filled in later */
-
- if (!WriteOK(tif, &tif->tif_header, sizeof (TIFFHeader))) {
- TIFFError(name, "Error writing TIFF header");
- goto bad;
- }
- /*
- * Setup the byte order handling.
- */
- TIFFInitOrder(tif, tif->tif_header.tiff_magic, bigendian);
- /*
- * Setup default directory.
- */
- if (!TIFFDefaultDirectory(tif))
- goto bad;
- tif->tif_diroff = 0;
- tif->tif_dirlist = NULL;
- tif->tif_dirnumber = 0;
- return (tif);
- }
- /*
- * Setup the byte order handling.
- */
- if (tif->tif_header.tiff_magic != TIFF_BIGENDIAN &&
- tif->tif_header.tiff_magic != TIFF_LITTLEENDIAN) {
- TIFFError(name, "Not a TIFF file, bad magic number %d (0x%x)",
- tif->tif_header.tiff_magic,
- tif->tif_header.tiff_magic);
- goto bad;
- }
- TIFFInitOrder(tif, tif->tif_header.tiff_magic, bigendian);
- /*
- * Swap header if required.
- */
- if (tif->tif_flags & TIFF_SWAB) {
- TIFFSwabShort(&tif->tif_header.tiff_version);
- TIFFSwabLong(&tif->tif_header.tiff_diroff);
- }
- /*
- * Now check version (if needed, it's been byte-swapped).
- * Note that this isn't actually a version number, it's a
- * magic number that doesn't change (stupid).
- */
- if (tif->tif_header.tiff_version == TIFF_BIGTIFF_VERSION) {
- TIFFError(name,
- "This is a BigTIFF file. This format not supported\n"
- "by this version of libtiff." );
- goto bad;
- }
- if (tif->tif_header.tiff_version != TIFF_VERSION) {
- TIFFError(name,
- "Not a TIFF file, bad version number %d (0x%x)",
- tif->tif_header.tiff_version,
- tif->tif_header.tiff_version);
- goto bad;
- }
- tif->tif_flags |= TIFF_MYBUFFER;
- tif->tif_rawcp = tif->tif_rawdata = 0;
- tif->tif_rawdatasize = 0;
- /*
- * Setup initial directory.
- */
- switch (mode[0]) {
- case 'r':
- tif->tif_nextdiroff = tif->tif_header.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) &&
- !TIFFMapFileContents(tif, (tdata_t*) &tif->tif_base, &tif->tif_size))
- tif->tif_flags &= ~TIFF_MAPPED;
- if (TIFFReadDirectory(tif)) {
- tif->tif_rawcc = -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.
- */
-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: */
projects / opencv / blobdiff