/* $Id: tif_open.c,v 1.33.2.1 2010-06-08 18:50:42 bfriesen 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"
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)
{
(void) fd; (void) pbase; (void) psize;
return (0);
}
static void
_tiffDummyUnmapProc(thandle_t fd, tdata_t base, toff_t size)
{
(void) fd; (void) base; (void) 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)
{
tif->tif_typemask = typemask;
if (magic == TIFF_BIGENDIAN) {
tif->tif_typeshift = bigTypeshift;
#ifndef WORDS_BIGENDIAN
tif->tif_flags |= TIFF_SWAB;
#endif
} else {
tif->tif_typeshift = litTypeshift;
#ifdef WORDS_BIGENDIAN
tif->tif_flags |= TIFF_SWAB;
#endif
}
}
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;
m = _TIFFgetMode(mode, module);
if (m == -1)
goto bad2;
tif = (TIFF *)_TIFFmalloc(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 = (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) {
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
*
* 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;
}
/*
* Read in TIFF header.
*/
if (tif->tif_mode & O_TRUNC ||
!ReadOK(tif, &tif->tif_header, sizeof (TIFFHeader))) {
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.tiff_magic = tif->tif_flags & TIFF_SWAB
? TIFF_LITTLEENDIAN : TIFF_BIGENDIAN;
#else
tif->tif_header.tiff_magic = tif->tif_flags & TIFF_SWAB
? TIFF_BIGENDIAN : TIFF_LITTLEENDIAN;
#endif
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 */
/*
* 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, sizeof (TIFFHeader))) {
TIFFErrorExt(tif->tif_clientdata, name,
"Error writing TIFF header");
goto bad;
}
/*
* Setup the byte order handling.
*/
TIFFInitOrder(tif, tif->tif_header.tiff_magic);
/*
* 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.tiff_magic != TIFF_BIGENDIAN &&
tif->tif_header.tiff_magic != TIFF_LITTLEENDIAN
#if MDI_SUPPORT
&&
#if HOST_BIGENDIAN
tif->tif_header.tiff_magic != MDI_BIGENDIAN
#else
tif->tif_header.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.tiff_magic,
tif->tif_header.tiff_magic);
goto bad;
}
TIFFInitOrder(tif, tif->tif_header.tiff_magic);
/*
* 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) {
TIFFErrorExt(tif->tif_clientdata, 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) {
TIFFErrorExt(tif->tif_clientdata, 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;
/*
* 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.
*/
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: */
/*
* Local Variables:
* mode: c
* c-basic-offset: 8
* fill-column: 78
* End:
*/