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libtiff/libtiff/tif_dirread.c

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/* $Header: /cvs/maptools/cvsroot/libtiff/libtiff/tif_dirread.c,v 1.25 2003-11-17 16:40:28 warmerda 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.
*
* Directory Read Support Routines.
*/
#include "tiffiop.h"
#define IGNORE 0 /* tag placeholder used below */
#if HAVE_IEEEFP
#define TIFFCvtIEEEFloatToNative(tif, n, fp)
#define TIFFCvtIEEEDoubleToNative(tif, n, dp)
#else
extern void TIFFCvtIEEEFloatToNative(TIFF*, uint32, float*);
extern void TIFFCvtIEEEDoubleToNative(TIFF*, uint32, double*);
#endif
static int EstimateStripByteCounts(TIFF*, TIFFDirEntry*, uint16);
static void MissingRequired(TIFF*, const char*);
static int CheckDirCount(TIFF*, TIFFDirEntry*, uint32);
static tsize_t TIFFFetchData(TIFF*, TIFFDirEntry*, char*);
static tsize_t TIFFFetchString(TIFF*, TIFFDirEntry*, char*);
static float TIFFFetchRational(TIFF*, TIFFDirEntry*);
static int TIFFFetchNormalTag(TIFF*, TIFFDirEntry*);
static int TIFFFetchPerSampleShorts(TIFF*, TIFFDirEntry*, int*);
static int TIFFFetchPerSampleAnys(TIFF*, TIFFDirEntry*, double*);
static int TIFFFetchShortArray(TIFF*, TIFFDirEntry*, uint16*);
static int TIFFFetchStripThing(TIFF*, TIFFDirEntry*, long, uint32**);
static int TIFFFetchExtraSamples(TIFF*, TIFFDirEntry*);
static int TIFFFetchRefBlackWhite(TIFF*, TIFFDirEntry*);
static float TIFFFetchFloat(TIFF*, TIFFDirEntry*);
static int TIFFFetchFloatArray(TIFF*, TIFFDirEntry*, float*);
static int TIFFFetchDoubleArray(TIFF*, TIFFDirEntry*, double*);
static int TIFFFetchAnyArray(TIFF*, TIFFDirEntry*, double*);
static int TIFFFetchShortPair(TIFF*, TIFFDirEntry*);
static void ChopUpSingleUncompressedStrip(TIFF*);
static char *
CheckMalloc(TIFF* tif, tsize_t n, const char* what)
{
char *cp = (char*)_TIFFmalloc(n);
if (cp == NULL)
TIFFError(tif->tif_name, "No space %s", what);
return (cp);
}
/*
* Read the next TIFF directory from a file
* and convert it to the internal format.
* We read directories sequentially.
*/
int
TIFFReadDirectory(TIFF* tif)
{
static const char module[] = "TIFFReadDirectory";
register TIFFDirEntry* dp;
register int n;
register TIFFDirectory* td;
TIFFDirEntry* dir;
int iv;
long v;
double dv;
const TIFFFieldInfo* fip;
int fix;
uint16 dircount;
toff_t nextdiroff;
char* cp;
int diroutoforderwarning = 0;
tif->tif_diroff = tif->tif_nextdiroff;
if (tif->tif_diroff == 0) /* no more directories */
return (0);
/*
* XXX: Trick to prevent IFD looping. The one can create TIFF file
* with looped directory pointers. We will maintain a list of already
* seen directories and check every IFD offset against this list.
*/
for (n = 0; n < tif->tif_dirnumber; n++) {
if (tif->tif_dirlist[n] == tif->tif_diroff)
return (0);
}
tif->tif_dirnumber++;
tif->tif_dirlist = _TIFFrealloc(tif->tif_dirlist,
tif->tif_dirnumber * sizeof(toff_t));
if (!tif->tif_dirlist) {
TIFFError(module,
"%.1000s: Failed to allocate space for IFD list",
tif->tif_name);
return (0);
}
tif->tif_dirlist[tif->tif_dirnumber - 1] = tif->tif_diroff;
/*
* Cleanup any previous compression state.
*/
(*tif->tif_cleanup)(tif);
tif->tif_curdir++;
nextdiroff = 0;
if (!isMapped(tif)) {
if (!SeekOK(tif, tif->tif_diroff)) {
TIFFError(module,
"%.1000s: Seek error accessing TIFF directory",
tif->tif_name);
return (0);
}
if (!ReadOK(tif, &dircount, sizeof (uint16))) {
TIFFError(module,
"%.1000s: Can not read TIFF directory count",
tif->tif_name);
return (0);
}
if (tif->tif_flags & TIFF_SWAB)
TIFFSwabShort(&dircount);
dir = (TIFFDirEntry *)CheckMalloc(tif,
dircount * sizeof (TIFFDirEntry), "to read TIFF directory");
if (dir == NULL)
return (0);
if (!ReadOK(tif, dir, dircount*sizeof (TIFFDirEntry))) {
TIFFError(module,
"%.100s: Can not read TIFF directory",
tif->tif_name);
goto bad;
}
/*
* Read offset to next directory for sequential scans.
*/
(void) ReadOK(tif, &nextdiroff, sizeof (uint32));
} else {
toff_t off = tif->tif_diroff;
if (off + sizeof (uint16) > tif->tif_size) {
TIFFError(module,
"%.1000s: Can not read TIFF directory count",
tif->tif_name);
return (0);
} else
_TIFFmemcpy(&dircount, tif->tif_base + off, sizeof (uint16));
off += sizeof (uint16);
if (tif->tif_flags & TIFF_SWAB)
TIFFSwabShort(&dircount);
dir = (TIFFDirEntry *)CheckMalloc(tif,
dircount * sizeof (TIFFDirEntry), "to read TIFF directory");
if (dir == NULL)
return (0);
if (off + dircount*sizeof (TIFFDirEntry) > tif->tif_size) {
TIFFError(module,
"%.1000s: Can not read TIFF directory",
tif->tif_name);
goto bad;
} else
_TIFFmemcpy(dir, tif->tif_base + off,
dircount*sizeof (TIFFDirEntry));
off += dircount* sizeof (TIFFDirEntry);
if (off + sizeof (uint32) <= tif->tif_size)
_TIFFmemcpy(&nextdiroff, tif->tif_base+off, sizeof (uint32));
}
if (tif->tif_flags & TIFF_SWAB)
TIFFSwabLong(&nextdiroff);
tif->tif_nextdiroff = nextdiroff;
tif->tif_flags &= ~TIFF_BEENWRITING; /* reset before new dir */
/*
* Setup default value and then make a pass over
* the fields to check type and tag information,
* and to extract info required to size data
* structures. A second pass is made afterwards
* to read in everthing not taken in the first pass.
*/
td = &tif->tif_dir;
/* free any old stuff and reinit */
TIFFFreeDirectory(tif);
TIFFDefaultDirectory(tif);
/*
* Electronic Arts writes gray-scale TIFF files
* without a PlanarConfiguration directory entry.
* Thus we setup a default value here, even though
* the TIFF spec says there is no default value.
*/
TIFFSetField(tif, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
/*
* Sigh, we must make a separate pass through the
* directory for the following reason:
*
* We must process the Compression tag in the first pass
* in order to merge in codec-private tag definitions (otherwise
* we may get complaints about unknown tags). However, the
* Compression tag may be dependent on the SamplesPerPixel
* tag value because older TIFF specs permited Compression
* to be written as a SamplesPerPixel-count tag entry.
* Thus if we don't first figure out the correct SamplesPerPixel
* tag value then we may end up ignoring the Compression tag
* value because it has an incorrect count value (if the
* true value of SamplesPerPixel is not 1).
*
* It sure would have been nice if Aldus had really thought
* this stuff through carefully.
*/
for (dp = dir, n = dircount; n > 0; n--, dp++) {
if (tif->tif_flags & TIFF_SWAB) {
TIFFSwabArrayOfShort(&dp->tdir_tag, 2);
TIFFSwabArrayOfLong(&dp->tdir_count, 2);
}
if (dp->tdir_tag == TIFFTAG_SAMPLESPERPIXEL) {
if (!TIFFFetchNormalTag(tif, dp))
goto bad;
dp->tdir_tag = IGNORE;
}
}
/*
* First real pass over the directory.
*/
fix = 0;
for (dp = dir, n = dircount; n > 0; n--, dp++) {
/*
* Find the field information entry for this tag.
* Added check for tags to ignore ... [BFC]
*/
if( TIFFReassignTagToIgnore(TIS_EXTRACT, dp->tdir_tag) )
dp->tdir_tag = IGNORE;
if (fix >= tif->tif_nfields || dp->tdir_tag == IGNORE)
continue;
/*
* Silicon Beach (at least) writes unordered
* directory tags (violating the spec). Handle
* it here, but be obnoxious (maybe they'll fix it?).
*/
if (dp->tdir_tag < tif->tif_fieldinfo[fix]->field_tag) {
if (!diroutoforderwarning) {
TIFFWarning(module,
"%.1000s: invalid TIFF directory; tags are not sorted in ascending order",
tif->tif_name);
diroutoforderwarning = 1;
}
fix = 0; /* O(n^2) */
}
while (fix < tif->tif_nfields &&
tif->tif_fieldinfo[fix]->field_tag < dp->tdir_tag)
fix++;
if (fix >= tif->tif_nfields ||
tif->tif_fieldinfo[fix]->field_tag != dp->tdir_tag) {
TIFFWarning(module,
"%.1000s: unknown field with tag %d (0x%x) encountered",
tif->tif_name, dp->tdir_tag, dp->tdir_tag);
TIFFMergeFieldInfo( tif,
_TIFFCreateAnonFieldInfo( tif,
dp->tdir_tag, dp->tdir_type ),
1 );
fix = 0;
while (fix < tif->tif_nfields &&
tif->tif_fieldinfo[fix]->field_tag < dp->tdir_tag)
fix++;
}
/*
* Null out old tags that we ignore.
*/
if (tif->tif_fieldinfo[fix]->field_bit == FIELD_IGNORE) {
ignore:
dp->tdir_tag = IGNORE;
continue;
}
/*
* Check data type.
*/
fip = tif->tif_fieldinfo[fix];
while (dp->tdir_type != (u_short) fip->field_type) {
if (fip->field_type == TIFF_ANY) /* wildcard */
break;
fip++, fix++;
if (fix == tif->tif_nfields ||
fip->field_tag != dp->tdir_tag) {
TIFFWarning(module,
"%.1000s: wrong data type %d for \"%s\"; tag ignored",
tif->tif_name, dp->tdir_type,
fip[-1].field_name);
goto ignore;
}
}
/*
* Check count if known in advance.
*/
if (fip->field_readcount != TIFF_VARIABLE) {
uint32 expected = (fip->field_readcount == TIFF_SPP) ?
(uint32) td->td_samplesperpixel :
(uint32) fip->field_readcount;
if (!CheckDirCount(tif, dp, expected))
goto ignore;
}
switch (dp->tdir_tag) {
case TIFFTAG_COMPRESSION:
/*
* The 5.0 spec says the Compression tag has
* one value, while earlier specs say it has
* one value per sample. Because of this, we
* accept the tag if one value is supplied.
*/
if (dp->tdir_count == 1) {
v = TIFFExtractData(tif,
dp->tdir_type, dp->tdir_offset);
if (!TIFFSetField(tif, dp->tdir_tag, (int)v))
goto bad;
break;
}
if (!TIFFFetchPerSampleShorts(tif, dp, &iv) ||
!TIFFSetField(tif, dp->tdir_tag, iv))
goto bad;
dp->tdir_tag = IGNORE;
break;
case TIFFTAG_STRIPOFFSETS:
case TIFFTAG_STRIPBYTECOUNTS:
case TIFFTAG_TILEOFFSETS:
case TIFFTAG_TILEBYTECOUNTS:
TIFFSetFieldBit(tif, fip->field_bit);
break;
case TIFFTAG_IMAGEWIDTH:
case TIFFTAG_IMAGELENGTH:
case TIFFTAG_IMAGEDEPTH:
case TIFFTAG_TILELENGTH:
case TIFFTAG_TILEWIDTH:
case TIFFTAG_TILEDEPTH:
case TIFFTAG_PLANARCONFIG:
case TIFFTAG_ROWSPERSTRIP:
if (!TIFFFetchNormalTag(tif, dp))
goto bad;
dp->tdir_tag = IGNORE;
break;
case TIFFTAG_EXTRASAMPLES:
(void) TIFFFetchExtraSamples(tif, dp);
dp->tdir_tag = IGNORE;
break;
}
}
/*
* Allocate directory structure and setup defaults.
*/
if (!TIFFFieldSet(tif, FIELD_IMAGEDIMENSIONS)) {
MissingRequired(tif, "ImageLength");
goto bad;
}
if (!TIFFFieldSet(tif, FIELD_PLANARCONFIG)) {
MissingRequired(tif, "PlanarConfiguration");
goto bad;
}
/*
* Setup appropriate structures (by strip or by tile)
*/
if (!TIFFFieldSet(tif, FIELD_TILEDIMENSIONS)) {
td->td_nstrips = TIFFNumberOfStrips(tif);
td->td_tilewidth = td->td_imagewidth;
td->td_tilelength = td->td_rowsperstrip;
td->td_tiledepth = td->td_imagedepth;
tif->tif_flags &= ~TIFF_ISTILED;
} else {
td->td_nstrips = TIFFNumberOfTiles(tif);
tif->tif_flags |= TIFF_ISTILED;
}
td->td_stripsperimage = td->td_nstrips;
if (td->td_planarconfig == PLANARCONFIG_SEPARATE)
td->td_stripsperimage /= td->td_samplesperpixel;
if (!TIFFFieldSet(tif, FIELD_STRIPOFFSETS)) {
MissingRequired(tif,
isTiled(tif) ? "TileOffsets" : "StripOffsets");
goto bad;
}
/*
* Second pass: extract other information.
*/
for (dp = dir, n = dircount; n > 0; n--, dp++) {
if (dp->tdir_tag == IGNORE)
continue;
switch (dp->tdir_tag) {
case TIFFTAG_MINSAMPLEVALUE:
case TIFFTAG_MAXSAMPLEVALUE:
case TIFFTAG_BITSPERSAMPLE:
/*
* The 5.0 spec says the Compression tag has
* one value, while earlier specs say it has
* one value per sample. Because of this, we
* accept the tag if one value is supplied.
*
* The MinSampleValue, MaxSampleValue and
* BitsPerSample tags are supposed to be written
* as one value/sample, but some vendors incorrectly
* write one value only -- so we accept that
* as well (yech).
*/
if (dp->tdir_count == 1) {
v = TIFFExtractData(tif,
dp->tdir_type, dp->tdir_offset);
if (!TIFFSetField(tif, dp->tdir_tag, (int)v))
goto bad;
break;
}
/* fall thru... */
case TIFFTAG_DATATYPE:
case TIFFTAG_SAMPLEFORMAT:
if (!TIFFFetchPerSampleShorts(tif, dp, &iv) ||
!TIFFSetField(tif, dp->tdir_tag, iv))
goto bad;
break;
case TIFFTAG_SMINSAMPLEVALUE:
case TIFFTAG_SMAXSAMPLEVALUE:
if (!TIFFFetchPerSampleAnys(tif, dp, &dv) ||
!TIFFSetField(tif, dp->tdir_tag, dv))
goto bad;
break;
case TIFFTAG_STRIPOFFSETS:
case TIFFTAG_TILEOFFSETS:
if (!TIFFFetchStripThing(tif, dp,
td->td_nstrips, &td->td_stripoffset))
goto bad;
break;
case TIFFTAG_STRIPBYTECOUNTS:
case TIFFTAG_TILEBYTECOUNTS:
if (!TIFFFetchStripThing(tif, dp,
td->td_nstrips, &td->td_stripbytecount))
goto bad;
break;
case TIFFTAG_COLORMAP:
case TIFFTAG_TRANSFERFUNCTION:
/*
* TransferFunction can have either 1x or 3x data
* values; Colormap can have only 3x items.
*/
v = 1L<<td->td_bitspersample;
if (dp->tdir_tag == TIFFTAG_COLORMAP ||
dp->tdir_count != (uint32) v) {
if (!CheckDirCount(tif, dp, (uint32)(3*v)))
break;
}
v *= sizeof (uint16);
cp = CheckMalloc(tif, dp->tdir_count * sizeof (uint16),
"to read \"TransferFunction\" tag");
if (cp != NULL) {
if (TIFFFetchData(tif, dp, cp)) {
/*
* This deals with there being only
* one array to apply to all samples.
*/
uint32 c =
(uint32)1 << td->td_bitspersample;
if (dp->tdir_count == c)
v = 0;
TIFFSetField(tif, dp->tdir_tag,
cp, cp+v, cp+2*v);
}
_TIFFfree(cp);
}
break;
case TIFFTAG_PAGENUMBER:
case TIFFTAG_HALFTONEHINTS:
case TIFFTAG_YCBCRSUBSAMPLING:
case TIFFTAG_DOTRANGE:
(void) TIFFFetchShortPair(tif, dp);
break;
#ifdef COLORIMETRY_SUPPORT
case TIFFTAG_REFERENCEBLACKWHITE:
(void) TIFFFetchRefBlackWhite(tif, dp);
break;
#endif
/* BEGIN REV 4.0 COMPATIBILITY */
case TIFFTAG_OSUBFILETYPE:
v = 0;
switch (TIFFExtractData(tif, dp->tdir_type,
dp->tdir_offset)) {
case OFILETYPE_REDUCEDIMAGE:
v = FILETYPE_REDUCEDIMAGE;
break;
case OFILETYPE_PAGE:
v = FILETYPE_PAGE;
break;
}
if (v)
(void) TIFFSetField(tif,
TIFFTAG_SUBFILETYPE, (int)v);
break;
/* END REV 4.0 COMPATIBILITY */
default:
(void) TIFFFetchNormalTag(tif, dp);
break;
}
}
/*
* Verify Palette image has a Colormap.
*/
if (td->td_photometric == PHOTOMETRIC_PALETTE &&
!TIFFFieldSet(tif, FIELD_COLORMAP)) {
MissingRequired(tif, "Colormap");
goto bad;
}
/*
* Attempt to deal with a missing StripByteCounts tag.
*/
if (!TIFFFieldSet(tif, FIELD_STRIPBYTECOUNTS)) {
/*
* Some manufacturers violate the spec by not giving
* the size of the strips. In this case, assume there
* is one uncompressed strip of data.
*/
if ((td->td_planarconfig == PLANARCONFIG_CONTIG &&
td->td_nstrips > 1) ||
(td->td_planarconfig == PLANARCONFIG_SEPARATE &&
td->td_nstrips != td->td_samplesperpixel)) {
MissingRequired(tif, "StripByteCounts");
goto bad;
}
TIFFWarning(module,
"%.1000s: TIFF directory is missing required "
"\"%s\" field, calculating from imagelength",
tif->tif_name,
_TIFFFieldWithTag(tif,TIFFTAG_STRIPBYTECOUNTS)->field_name);
if (EstimateStripByteCounts(tif, dir, dircount) < 0)
goto bad;
/*
* Assume we have wrong StripByteCount value (in case of single strip) in
* following cases:
* - it is equal to zero along with StripOffset;
* - it is larger than file itself (in case of uncompressed image).
*/
#define BYTECOUNTLOOKSBAD \
( (td->td_stripbytecount[0] == 0 && td->td_stripoffset[0] != 0) || \
(td->td_compression == COMPRESSION_NONE && \
td->td_stripbytecount[0] > TIFFGetFileSize(tif) - td->td_stripoffset[0]) )
} else if (td->td_nstrips == 1 && BYTECOUNTLOOKSBAD) {
/*
* Plexus (and others) sometimes give a value
* of zero for a tag when they don't know what
* the correct value is! Try and handle the
* simple case of estimating the size of a one
* strip image.
*/
TIFFWarning(module,
"%.1000s: Bogus \"%s\" field, ignoring and calculating from imagelength",
tif->tif_name,
_TIFFFieldWithTag(tif,TIFFTAG_STRIPBYTECOUNTS)->field_name);
if(EstimateStripByteCounts(tif, dir, dircount) < 0)
goto bad;
}
if (dir)
_TIFFfree((char *)dir);
if (!TIFFFieldSet(tif, FIELD_MAXSAMPLEVALUE))
td->td_maxsamplevalue = (uint16)((1L<<td->td_bitspersample)-1);
/*
* Setup default compression scheme.
*/
if (!TIFFFieldSet(tif, FIELD_COMPRESSION))
TIFFSetField(tif, TIFFTAG_COMPRESSION, COMPRESSION_NONE);
/*
* Some manufacturers make life difficult by writing
* large amounts of uncompressed data as a single strip.
* This is contrary to the recommendations of the spec.
* The following makes an attempt at breaking such images
* into strips closer to the recommended 8k bytes. A
* side effect, however, is that the RowsPerStrip tag
* value may be changed.
*/
if (td->td_nstrips == 1 && td->td_compression == COMPRESSION_NONE &&
(tif->tif_flags & (TIFF_STRIPCHOP|TIFF_ISTILED)) == TIFF_STRIPCHOP)
ChopUpSingleUncompressedStrip(tif);
/*
* Reinitialize i/o since we are starting on a new directory.
*/
tif->tif_row = (uint32) -1;
tif->tif_curstrip = (tstrip_t) -1;
tif->tif_col = (uint32) -1;
tif->tif_curtile = (ttile_t) -1;
tif->tif_tilesize = TIFFTileSize(tif);
tif->tif_scanlinesize = TIFFScanlineSize(tif);
return (1);
bad:
if (dir)
_TIFFfree(dir);
return (0);
}
static int
EstimateStripByteCounts(TIFF* tif, TIFFDirEntry* dir, uint16 dircount)
{
static const char module[] = "EstimateStripByteCounts";
register TIFFDirEntry *dp;
register TIFFDirectory *td = &tif->tif_dir;
uint16 i;
if (td->td_stripbytecount)
_TIFFfree(td->td_stripbytecount);
td->td_stripbytecount = (uint32*)
CheckMalloc(tif, td->td_nstrips * sizeof (uint32),
"for \"StripByteCounts\" array");
if (td->td_compression != COMPRESSION_NONE) {
uint32 space = (uint32)(sizeof (TIFFHeader)
+ sizeof (uint16)
+ (dircount * sizeof (TIFFDirEntry))
+ sizeof (uint32));
toff_t filesize = TIFFGetFileSize(tif);
uint16 n;
/* calculate amount of space used by indirect values */
for (dp = dir, n = dircount; n > 0; n--, dp++)
{
uint32 cc = TIFFDataWidth(dp->tdir_type);
if (cc == 0) {
TIFFError(module,
"%.1000s: Cannot determine size of unknown tag type %d",
tif->tif_name, dp->tdir_type);
return -1;
}
cc = cc * dp->tdir_count;
if (cc > sizeof (uint32))
space += cc;
}
space = filesize - space;
if (td->td_planarconfig == PLANARCONFIG_SEPARATE)
space /= td->td_samplesperpixel;
for (i = 0; i < td->td_nstrips; i++)
td->td_stripbytecount[i] = space;
/*
* This gross hack handles the case were the offset to
* the last strip is past the place where we think the strip
* should begin. Since a strip of data must be contiguous,
* it's safe to assume that we've overestimated the amount
* of data in the strip and trim this number back accordingly.
*/
i--;
if (((toff_t)(td->td_stripoffset[i]+td->td_stripbytecount[i]))
> filesize)
td->td_stripbytecount[i] =
filesize - td->td_stripoffset[i];
} else {
uint32 rowbytes = TIFFScanlineSize(tif);
uint32 rowsperstrip = td->td_imagelength/td->td_stripsperimage;
for (i = 0; i < td->td_nstrips; i++)
td->td_stripbytecount[i] = rowbytes*rowsperstrip;
}
TIFFSetFieldBit(tif, FIELD_STRIPBYTECOUNTS);
if (!TIFFFieldSet(tif, FIELD_ROWSPERSTRIP))
td->td_rowsperstrip = td->td_imagelength;
return 1;
}
static void
MissingRequired(TIFF* tif, const char* tagname)
{
static const char module[] = "MissingRequired";
TIFFError(module,
"%.1000s: TIFF directory is missing required \"%s\" field",
tif->tif_name, tagname);
}
/*
* Check the count field of a directory
* entry against a known value. The caller
* is expected to skip/ignore the tag if
* there is a mismatch.
*/
static int
CheckDirCount(TIFF* tif, TIFFDirEntry* dir, uint32 count)
{
if (count != dir->tdir_count) {
TIFFWarning(tif->tif_name,
"incorrect count for field \"%s\" (%lu, expecting %lu); tag ignored",
_TIFFFieldWithTag(tif, dir->tdir_tag)->field_name,
dir->tdir_count, count);
return (0);
}
return (1);
}
/*
* Fetch a contiguous directory item.
*/
static tsize_t
TIFFFetchData(TIFF* tif, TIFFDirEntry* dir, char* cp)
{
int w = TIFFDataWidth(dir->tdir_type);
tsize_t cc = dir->tdir_count * w;
if (!isMapped(tif)) {
if (!SeekOK(tif, dir->tdir_offset))
goto bad;
if (!ReadOK(tif, cp, cc))
goto bad;
} else {
if (dir->tdir_offset + cc > tif->tif_size)
goto bad;
_TIFFmemcpy(cp, tif->tif_base + dir->tdir_offset, cc);
}
if (tif->tif_flags & TIFF_SWAB) {
switch (dir->tdir_type) {
case TIFF_SHORT:
case TIFF_SSHORT:
TIFFSwabArrayOfShort((uint16*) cp, dir->tdir_count);
break;
case TIFF_LONG:
case TIFF_SLONG:
case TIFF_FLOAT:
TIFFSwabArrayOfLong((uint32*) cp, dir->tdir_count);
break;
case TIFF_RATIONAL:
case TIFF_SRATIONAL:
TIFFSwabArrayOfLong((uint32*) cp, 2*dir->tdir_count);
break;
case TIFF_DOUBLE:
TIFFSwabArrayOfDouble((double*) cp, dir->tdir_count);
break;
}
}
return (cc);
bad:
TIFFError(tif->tif_name, "Error fetching data for field \"%s\"",
_TIFFFieldWithTag(tif, dir->tdir_tag)->field_name);
return ((tsize_t) 0);
}
/*
* Fetch an ASCII item from the file.
*/
static tsize_t
TIFFFetchString(TIFF* tif, TIFFDirEntry* dir, char* cp)
{
if (dir->tdir_count <= 4) {
uint32 l = dir->tdir_offset;
if (tif->tif_flags & TIFF_SWAB)
TIFFSwabLong(&l);
_TIFFmemcpy(cp, &l, dir->tdir_count);
return (1);
}
return (TIFFFetchData(tif, dir, cp));
}
/*
* Convert numerator+denominator to float.
*/
static int
cvtRational(TIFF* tif, TIFFDirEntry* dir, uint32 num, uint32 denom, float* rv)
{
if (denom == 0) {
TIFFError(tif->tif_name,
"%s: Rational with zero denominator (num = %lu)",
_TIFFFieldWithTag(tif, dir->tdir_tag)->field_name, num);
return (0);
} else {
if (dir->tdir_type == TIFF_RATIONAL)
*rv = ((float)num / (float)denom);
else
*rv = ((float)(int32)num / (float)(int32)denom);
return (1);
}
}
/*
* Fetch a rational item from the file
* at offset off and return the value
* as a floating point number.
*/
static float
TIFFFetchRational(TIFF* tif, TIFFDirEntry* dir)
{
uint32 l[2];
float v;
return (!TIFFFetchData(tif, dir, (char *)l) ||
!cvtRational(tif, dir, l[0], l[1], &v) ? 1.0f : v);
}
/*
* Fetch a single floating point value
* from the offset field and return it
* as a native float.
*/
static float
TIFFFetchFloat(TIFF* tif, TIFFDirEntry* dir)
{
long l = TIFFExtractData(tif, dir->tdir_type, dir->tdir_offset);
float v = *(float*) &l;
TIFFCvtIEEEFloatToNative(tif, 1, &v);
return (v);
}
/*
* Fetch an array of BYTE or SBYTE values.
*/
static int
TIFFFetchByteArray(TIFF* tif, TIFFDirEntry* dir, uint16* v)
{
if (dir->tdir_count <= 4) {
/*
* Extract data from offset field.
*/
if (tif->tif_header.tiff_magic == TIFF_BIGENDIAN) {
if (dir->tdir_type == TIFF_SBYTE)
switch (dir->tdir_count) {
case 4: v[3] = (signed char)(dir->tdir_offset & 0xff);
case 3: v[2] = (signed char)((dir->tdir_offset >> 8) & 0xff);
case 2: v[1] = (signed char)((dir->tdir_offset >> 16) & 0xff);
case 1: v[0] = (signed char)(dir->tdir_offset >> 24);
}
else
switch (dir->tdir_count) {
case 4: v[3] = (uint16)(dir->tdir_offset & 0xff);
case 3: v[2] = (uint16)((dir->tdir_offset >> 8) & 0xff);
case 2: v[1] = (uint16)((dir->tdir_offset >> 16) & 0xff);
case 1: v[0] = (uint16)(dir->tdir_offset >> 24);
}
} else {
if (dir->tdir_type == TIFF_SBYTE)
switch (dir->tdir_count) {
case 4: v[3] = (signed char)(dir->tdir_offset >> 24);
case 3: v[2] = (signed char)((dir->tdir_offset >> 16) & 0xff);
case 2: v[1] = (signed char)((dir->tdir_offset >> 8) & 0xff);
case 1: v[0] = (signed char)(dir->tdir_offset & 0xff);
}
else
switch (dir->tdir_count) {
case 4: v[3] = (uint16)(dir->tdir_offset >> 24);
case 3: v[2] = (uint16)((dir->tdir_offset >> 16) & 0xff);
case 2: v[1] = (uint16)((dir->tdir_offset >> 8) & 0xff);
case 1: v[0] = (uint16)(dir->tdir_offset & 0xff);
}
}
return (1);
} else
return (TIFFFetchData(tif, dir, (char*) v) != 0); /* XXX */
}
/*
* Fetch an array of SHORT or SSHORT values.
*/
static int
TIFFFetchShortArray(TIFF* tif, TIFFDirEntry* dir, uint16* v)
{
if (dir->tdir_count <= 2) {
if (tif->tif_header.tiff_magic == TIFF_BIGENDIAN) {
switch (dir->tdir_count) {
case 2: v[1] = (uint16) (dir->tdir_offset & 0xffff);
case 1: v[0] = (uint16) (dir->tdir_offset >> 16);
}
} else {
switch (dir->tdir_count) {
case 2: v[1] = (uint16) (dir->tdir_offset >> 16);
case 1: v[0] = (uint16) (dir->tdir_offset & 0xffff);
}
}
return (1);
} else
return (TIFFFetchData(tif, dir, (char *)v) != 0);
}
/*
* Fetch a pair of SHORT or BYTE values.
*/
static int
TIFFFetchShortPair(TIFF* tif, TIFFDirEntry* dir)
{
uint16 v[4];
int ok = 0;
switch (dir->tdir_type) {
case TIFF_SHORT:
case TIFF_SSHORT:
ok = TIFFFetchShortArray(tif, dir, v);
break;
case TIFF_BYTE:
case TIFF_SBYTE:
ok = TIFFFetchByteArray(tif, dir, v);
break;
}
if (ok)
TIFFSetField(tif, dir->tdir_tag, v[0], v[1]);
return (ok);
}
/*
* Fetch an array of LONG or SLONG values.
*/
static int
TIFFFetchLongArray(TIFF* tif, TIFFDirEntry* dir, uint32* v)
{
if (dir->tdir_count == 1) {
v[0] = dir->tdir_offset;
return (1);
} else
return (TIFFFetchData(tif, dir, (char*) v) != 0);
}
/*
* Fetch an array of RATIONAL or SRATIONAL values.
*/
static int
TIFFFetchRationalArray(TIFF* tif, TIFFDirEntry* dir, float* v)
{
int ok = 0;
uint32* l;
l = (uint32*)CheckMalloc(tif,
dir->tdir_count*TIFFDataWidth(dir->tdir_type),
"to fetch array of rationals");
if (l) {
if (TIFFFetchData(tif, dir, (char *)l)) {
uint32 i;
for (i = 0; i < dir->tdir_count; i++) {
ok = cvtRational(tif, dir,
l[2*i+0], l[2*i+1], &v[i]);
if (!ok)
break;
}
}
_TIFFfree((char *)l);
}
return (ok);
}
/*
* Fetch an array of FLOAT values.
*/
static int
TIFFFetchFloatArray(TIFF* tif, TIFFDirEntry* dir, float* v)
{
if (dir->tdir_count == 1) {
v[0] = *(float*) &dir->tdir_offset;
TIFFCvtIEEEFloatToNative(tif, dir->tdir_count, v);
return (1);
} else if (TIFFFetchData(tif, dir, (char*) v)) {
TIFFCvtIEEEFloatToNative(tif, dir->tdir_count, v);
return (1);
} else
return (0);
}
/*
* Fetch an array of DOUBLE values.
*/
static int
TIFFFetchDoubleArray(TIFF* tif, TIFFDirEntry* dir, double* v)
{
if (TIFFFetchData(tif, dir, (char*) v)) {
TIFFCvtIEEEDoubleToNative(tif, dir->tdir_count, v);
return (1);
} else
return (0);
}
/*
* Fetch an array of ANY values. The actual values are
* returned as doubles which should be able hold all the
* types. Yes, there really should be an tany_t to avoid
* this potential non-portability ... Note in particular
* that we assume that the double return value vector is
* large enough to read in any fundamental type. We use
* that vector as a buffer to read in the base type vector
* and then convert it in place to double (from end
* to front of course).
*/
static int
TIFFFetchAnyArray(TIFF* tif, TIFFDirEntry* dir, double* v)
{
int i;
switch (dir->tdir_type) {
case TIFF_BYTE:
case TIFF_SBYTE:
if (!TIFFFetchByteArray(tif, dir, (uint16*) v))
return (0);
if (dir->tdir_type == TIFF_BYTE) {
uint16* vp = (uint16*) v;
for (i = dir->tdir_count-1; i >= 0; i--)
v[i] = vp[i];
} else {
int16* vp = (int16*) v;
for (i = dir->tdir_count-1; i >= 0; i--)
v[i] = vp[i];
}
break;
case TIFF_SHORT:
case TIFF_SSHORT:
if (!TIFFFetchShortArray(tif, dir, (uint16*) v))
return (0);
if (dir->tdir_type == TIFF_SHORT) {
uint16* vp = (uint16*) v;
for (i = dir->tdir_count-1; i >= 0; i--)
v[i] = vp[i];
} else {
int16* vp = (int16*) v;
for (i = dir->tdir_count-1; i >= 0; i--)
v[i] = vp[i];
}
break;
case TIFF_LONG:
case TIFF_SLONG:
if (!TIFFFetchLongArray(tif, dir, (uint32*) v))
return (0);
if (dir->tdir_type == TIFF_LONG) {
uint32* vp = (uint32*) v;
for (i = dir->tdir_count-1; i >= 0; i--)
v[i] = vp[i];
} else {
int32* vp = (int32*) v;
for (i = dir->tdir_count-1; i >= 0; i--)
v[i] = vp[i];
}
break;
case TIFF_RATIONAL:
case TIFF_SRATIONAL:
if (!TIFFFetchRationalArray(tif, dir, (float*) v))
return (0);
{ float* vp = (float*) v;
for (i = dir->tdir_count-1; i >= 0; i--)
v[i] = vp[i];
}
break;
case TIFF_FLOAT:
if (!TIFFFetchFloatArray(tif, dir, (float*) v))
return (0);
{ float* vp = (float*) v;
for (i = dir->tdir_count-1; i >= 0; i--)
v[i] = vp[i];
}
break;
case TIFF_DOUBLE:
return (TIFFFetchDoubleArray(tif, dir, (double*) v));
default:
/* TIFF_NOTYPE */
/* TIFF_ASCII */
/* TIFF_UNDEFINED */
TIFFError(tif->tif_name,
"cannot read TIFF_ANY type %d for field \"%s\"",
_TIFFFieldWithTag(tif, dir->tdir_tag)->field_name);
return (0);
}
return (1);
}
/*
* Fetch a tag that is not handled by special case code.
*/
static int
TIFFFetchNormalTag(TIFF* tif, TIFFDirEntry* dp)
{
static const char mesg[] = "to fetch tag value";
int ok = 0;
const TIFFFieldInfo* fip = _TIFFFieldWithTag(tif, dp->tdir_tag);
if (dp->tdir_count > 1) { /* array of values */
char* cp = NULL;
switch (dp->tdir_type) {
case TIFF_BYTE:
case TIFF_SBYTE:
/* NB: always expand BYTE values to shorts */
cp = CheckMalloc(tif,
dp->tdir_count * sizeof (uint16), mesg);
ok = cp && TIFFFetchByteArray(tif, dp, (uint16*) cp);
break;
case TIFF_SHORT:
case TIFF_SSHORT:
cp = CheckMalloc(tif,
dp->tdir_count * sizeof (uint16), mesg);
ok = cp && TIFFFetchShortArray(tif, dp, (uint16*) cp);
break;
case TIFF_LONG:
case TIFF_SLONG:
cp = CheckMalloc(tif,
dp->tdir_count * sizeof (uint32), mesg);
ok = cp && TIFFFetchLongArray(tif, dp, (uint32*) cp);
break;
case TIFF_RATIONAL:
case TIFF_SRATIONAL:
cp = CheckMalloc(tif,
dp->tdir_count * sizeof (float), mesg);
ok = cp && TIFFFetchRationalArray(tif, dp, (float*) cp);
break;
case TIFF_FLOAT:
cp = CheckMalloc(tif,
dp->tdir_count * sizeof (float), mesg);
ok = cp && TIFFFetchFloatArray(tif, dp, (float*) cp);
break;
case TIFF_DOUBLE:
cp = CheckMalloc(tif,
dp->tdir_count * sizeof (double), mesg);
ok = cp && TIFFFetchDoubleArray(tif, dp, (double*) cp);
break;
case TIFF_ASCII:
case TIFF_UNDEFINED: /* bit of a cheat... */
/*
* Some vendors write strings w/o the trailing
* NULL byte, so always append one just in case.
*/
cp = CheckMalloc(tif, dp->tdir_count+1, mesg);
if( (ok = (cp && TIFFFetchString(tif, dp, cp))) != 0 )
cp[dp->tdir_count] = '\0'; /* XXX */
break;
}
if (ok) {
ok = (fip->field_passcount ?
TIFFSetField(tif, dp->tdir_tag, dp->tdir_count, cp)
: TIFFSetField(tif, dp->tdir_tag, cp));
}
if (cp != NULL)
_TIFFfree(cp);
} else if (CheckDirCount(tif, dp, 1)) { /* singleton value */
switch (dp->tdir_type) {
case TIFF_BYTE:
case TIFF_SBYTE:
case TIFF_SHORT:
case TIFF_SSHORT:
/*
* If the tag is also acceptable as a LONG or SLONG
* then TIFFSetField will expect an uint32 parameter
* passed to it (through varargs). Thus, for machines
* where sizeof (int) != sizeof (uint32) we must do
* a careful check here. It's hard to say if this
* is worth optimizing.
*
* NB: We use TIFFFieldWithTag here knowing that
* it returns us the first entry in the table
* for the tag and that that entry is for the
* widest potential data type the tag may have.
*/
{ TIFFDataType type = fip->field_type;
if (type != TIFF_LONG && type != TIFF_SLONG) {
uint16 v = (uint16)
TIFFExtractData(tif, dp->tdir_type, dp->tdir_offset);
ok = (fip->field_passcount ?
TIFFSetField(tif, dp->tdir_tag, 1, &v)
: TIFFSetField(tif, dp->tdir_tag, v));
break;
}
}
/* fall thru... */
case TIFF_LONG:
case TIFF_SLONG:
{ uint32 v32 =
TIFFExtractData(tif, dp->tdir_type, dp->tdir_offset);
ok = (fip->field_passcount ?
TIFFSetField(tif, dp->tdir_tag, 1, &v32)
: TIFFSetField(tif, dp->tdir_tag, v32));
}
break;
case TIFF_RATIONAL:
case TIFF_SRATIONAL:
case TIFF_FLOAT:
{ float v = (dp->tdir_type == TIFF_FLOAT ?
TIFFFetchFloat(tif, dp)
: TIFFFetchRational(tif, dp));
ok = (fip->field_passcount ?
TIFFSetField(tif, dp->tdir_tag, 1, &v)
: TIFFSetField(tif, dp->tdir_tag, v));
}
break;
case TIFF_DOUBLE:
{ double v;
ok = (TIFFFetchDoubleArray(tif, dp, &v) &&
(fip->field_passcount ?
TIFFSetField(tif, dp->tdir_tag, 1, &v)
: TIFFSetField(tif, dp->tdir_tag, v))
);
}
break;
case TIFF_ASCII:
case TIFF_UNDEFINED: /* bit of a cheat... */
{ char c[2];
if( (ok = (TIFFFetchString(tif, dp, c) != 0)) != 0 ){
c[1] = '\0'; /* XXX paranoid */
ok = TIFFSetField(tif, dp->tdir_tag, c);
}
}
break;
}
}
return (ok);
}
#define NITEMS(x) (sizeof (x) / sizeof (x[0]))
/*
* Fetch samples/pixel short values for
* the specified tag and verify that
* all values are the same.
*/
static int
TIFFFetchPerSampleShorts(TIFF* tif, TIFFDirEntry* dir, int* pl)
{
int samples = tif->tif_dir.td_samplesperpixel;
int status = 0;
if (CheckDirCount(tif, dir, (uint32) samples)) {
uint16 buf[10];
uint16* v = buf;
if (samples > NITEMS(buf))
v = (uint16*) _TIFFmalloc(samples * sizeof (uint16));
if (TIFFFetchShortArray(tif, dir, v)) {
int i;
for (i = 1; i < samples; i++)
if (v[i] != v[0]) {
TIFFError(tif->tif_name,
"Cannot handle different per-sample values for field \"%s\"",
_TIFFFieldWithTag(tif, dir->tdir_tag)->field_name);
goto bad;
}
*pl = v[0];
status = 1;
}
bad:
if (v != buf)
_TIFFfree((char*) v);
}
return (status);
}
/*
* Fetch samples/pixel ANY values for
* the specified tag and verify that
* all values are the same.
*/
static int
TIFFFetchPerSampleAnys(TIFF* tif, TIFFDirEntry* dir, double* pl)
{
int samples = (int) tif->tif_dir.td_samplesperpixel;
int status = 0;
if (CheckDirCount(tif, dir, (uint32) samples)) {
double buf[10];
double* v = buf;
if (samples > NITEMS(buf))
v = (double*) _TIFFmalloc(samples * sizeof (double));
if (TIFFFetchAnyArray(tif, dir, v)) {
int i;
for (i = 1; i < samples; i++)
if (v[i] != v[0]) {
TIFFError(tif->tif_name,
"Cannot handle different per-sample values for field \"%s\"",
_TIFFFieldWithTag(tif, dir->tdir_tag)->field_name);
goto bad;
}
*pl = v[0];
status = 1;
}
bad:
if (v != buf)
_TIFFfree(v);
}
return (status);
}
#undef NITEMS
/*
* Fetch a set of offsets or lengths.
* While this routine says "strips",
* in fact it's also used for tiles.
*/
static int
TIFFFetchStripThing(TIFF* tif, TIFFDirEntry* dir, long nstrips, uint32** lpp)
{
register uint32* lp;
int status;
CheckDirCount(tif, dir, (uint32) nstrips);
/*
* Allocate space for strip information.
*/
if (*lpp == NULL &&
(*lpp = (uint32 *)CheckMalloc(tif,
nstrips * sizeof (uint32), "for strip array")) == NULL)
return (0);
lp = *lpp;
memset( lp, 0, sizeof(uint32) * nstrips );
if (dir->tdir_type == (int)TIFF_SHORT) {
/*
* Handle uint16->uint32 expansion.
*/
uint16* dp = (uint16*) CheckMalloc(tif,
dir->tdir_count* sizeof (uint16), "to fetch strip tag");
if (dp == NULL)
return (0);
if( (status = TIFFFetchShortArray(tif, dir, dp)) != 0 ) {
int i;
for( i = 0; i < nstrips && i < (int) dir->tdir_count; i++ )
{
lp[i] = dp[i];
}
}
_TIFFfree((char*) dp);
} else if( nstrips != (int) dir->tdir_count ) {
/* Special case to correct length */
uint32* dp = (uint32*) CheckMalloc(tif,
dir->tdir_count* sizeof (uint32), "to fetch strip tag");
if (dp == NULL)
return (0);
status = TIFFFetchLongArray(tif, dir, dp);
if( status != 0 ) {
int i;
for( i = 0; i < nstrips && i < (int) dir->tdir_count; i++ )
{
lp[i] = dp[i];
}
}
_TIFFfree( (char *) dp );
} else
status = TIFFFetchLongArray(tif, dir, lp);
return (status);
}
#define NITEMS(x) (sizeof (x) / sizeof (x[0]))
/*
* Fetch and set the ExtraSamples tag.
*/
static int
TIFFFetchExtraSamples(TIFF* tif, TIFFDirEntry* dir)
{
uint16 buf[10];
uint16* v = buf;
int status;
if (dir->tdir_count > NITEMS(buf))
v = (uint16*) _TIFFmalloc(dir->tdir_count * sizeof (uint16));
if (dir->tdir_type == TIFF_BYTE)
status = TIFFFetchByteArray(tif, dir, v);
else
status = TIFFFetchShortArray(tif, dir, v);
if (status)
status = TIFFSetField(tif, dir->tdir_tag, dir->tdir_count, v);
if (v != buf)
_TIFFfree((char*) v);
return (status);
}
#undef NITEMS
#ifdef COLORIMETRY_SUPPORT
/*
* Fetch and set the RefBlackWhite tag.
*/
static int
TIFFFetchRefBlackWhite(TIFF* tif, TIFFDirEntry* dir)
{
static const char mesg[] = "for \"ReferenceBlackWhite\" array";
char* cp;
int ok;
if (dir->tdir_type == TIFF_RATIONAL)
return (TIFFFetchNormalTag(tif, dir));
/*
* Handle LONG's for backward compatibility.
*/
cp = CheckMalloc(tif, dir->tdir_count * sizeof (uint32), mesg);
if( (ok = (cp && TIFFFetchLongArray(tif, dir, (uint32*) cp))) != 0) {
float* fp = (float*)
CheckMalloc(tif, dir->tdir_count * sizeof (float), mesg);
if( (ok = (fp != NULL)) != 0 ) {
uint32 i;
for (i = 0; i < dir->tdir_count; i++)
fp[i] = (float)((uint32*) cp)[i];
ok = TIFFSetField(tif, dir->tdir_tag, fp);
_TIFFfree((char*) fp);
}
}
if (cp)
_TIFFfree(cp);
return (ok);
}
#endif
/*
* Replace a single strip (tile) of uncompressed data by
* multiple strips (tiles), each approximately 8Kbytes.
* This is useful for dealing with large images or
* for dealing with machines with a limited amount
* memory.
*/
static void
ChopUpSingleUncompressedStrip(TIFF* tif)
{
register TIFFDirectory *td = &tif->tif_dir;
uint32 bytecount = td->td_stripbytecount[0];
uint32 offset = td->td_stripoffset[0];
tsize_t rowbytes = TIFFVTileSize(tif, 1), stripbytes;
tstrip_t strip, nstrips, rowsperstrip;
uint32* newcounts;
uint32* newoffsets;
/*
* Make the rows hold at least one
* scanline, but fill 8k if possible.
*/
if (rowbytes > 8192) {
stripbytes = rowbytes;
rowsperstrip = 1;
} else if (rowbytes > 0 ) {
rowsperstrip = 8192 / rowbytes;
stripbytes = rowbytes * rowsperstrip;
}
else
return;
/* never increase the number of strips in an image */
if (rowsperstrip >= td->td_rowsperstrip)
return;
nstrips = (tstrip_t) TIFFhowmany(bytecount, stripbytes);
newcounts = (uint32*) CheckMalloc(tif, nstrips * sizeof (uint32),
"for chopped \"StripByteCounts\" array");
newoffsets = (uint32*) CheckMalloc(tif, nstrips * sizeof (uint32),
"for chopped \"StripOffsets\" array");
if (newcounts == NULL || newoffsets == NULL) {
/*
* Unable to allocate new strip information, give
* up and use the original one strip information.
*/
if (newcounts != NULL)
_TIFFfree(newcounts);
if (newoffsets != NULL)
_TIFFfree(newoffsets);
return;
}
/*
* Fill the strip information arrays with
* new bytecounts and offsets that reflect
* the broken-up format.
*/
for (strip = 0; strip < nstrips; strip++) {
if (stripbytes > (tsize_t) bytecount)
stripbytes = bytecount;
newcounts[strip] = stripbytes;
newoffsets[strip] = offset;
offset += stripbytes;
bytecount -= stripbytes;
}
/*
* Replace old single strip info with multi-strip info.
*/
td->td_stripsperimage = td->td_nstrips = nstrips;
TIFFSetField(tif, TIFFTAG_ROWSPERSTRIP, rowsperstrip);
_TIFFfree(td->td_stripbytecount);
_TIFFfree(td->td_stripoffset);
td->td_stripbytecount = newcounts;
td->td_stripoffset = newoffsets;
}
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