diff options
Diffstat (limited to 'tiff/libtiff/tif_dirread.c')
| -rw-r--r-- | tiff/libtiff/tif_dirread.c | 2081 |
1 files changed, 0 insertions, 2081 deletions
diff --git a/tiff/libtiff/tif_dirread.c b/tiff/libtiff/tif_dirread.c deleted file mode 100644 index 907b531..0000000 --- a/tiff/libtiff/tif_dirread.c +++ /dev/null @@ -1,2081 +0,0 @@ -/* $Id: tif_dirread.c,v 1.92.2.9 2010-06-14 00:21:46 fwarmerdam 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 */ - -#ifdef 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 TIFFDirEntry* TIFFReadDirectoryFind(TIFFDirEntry* dir, - uint16 dircount, uint16 tagid); -static int EstimateStripByteCounts(TIFF*, TIFFDirEntry*, uint16); -static void MissingRequired(TIFF*, const char*); -static int TIFFCheckDirOffset(TIFF*, toff_t); -static int CheckDirCount(TIFF*, TIFFDirEntry*, uint32); -static uint16 TIFFFetchDirectory(TIFF*, toff_t, TIFFDirEntry**, toff_t *); -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*, uint16*); -static int TIFFFetchPerSampleLongs(TIFF*, TIFFDirEntry*, uint32*); -static int TIFFFetchPerSampleAnys(TIFF*, TIFFDirEntry*, double*); -static int TIFFFetchShortArray(TIFF*, TIFFDirEntry*, uint16*); -static int TIFFFetchStripThing(TIFF*, TIFFDirEntry*, long, uint32**); -static int TIFFFetchRefBlackWhite(TIFF*, TIFFDirEntry*); -static int TIFFFetchSubjectDistance(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*); - -/* - * 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"; - - int n; - TIFFDirectory* td; - TIFFDirEntry *dp, *dir = NULL; - uint16 iv; - uint32 v; - const TIFFFieldInfo* fip; - size_t fix; - uint16 dircount; - int diroutoforderwarning = 0, compressionknown = 0; - int haveunknowntags = 0; - - tif->tif_diroff = tif->tif_nextdiroff; - /* - * Check whether we have the last offset or bad offset (IFD looping). - */ - if (!TIFFCheckDirOffset(tif, tif->tif_nextdiroff)) - return 0; - /* - * Cleanup any previous compression state. - */ - (*tif->tif_cleanup)(tif); - tif->tif_curdir++; - dircount = TIFFFetchDirectory(tif, tif->tif_nextdiroff, - &dir, &tif->tif_nextdiroff); - if (!dircount) { - TIFFErrorExt(tif->tif_clientdata, module, - "%s: Failed to read directory at offset %u", - tif->tif_name, tif->tif_nextdiroff); - return 0; - } - - 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++) { - - if (dp->tdir_tag == IGNORE) - continue; - if (fix >= tif->tif_nfields) - fix = 0; - - /* - * 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) { - TIFFWarningExt(tif->tif_clientdata, module, - "%s: 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) { - /* Unknown tag ... we'll deal with it below */ - haveunknowntags = 1; - continue; - } - /* - * 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 != (unsigned short) fip->field_type - && fix < tif->tif_nfields) { - if (fip->field_type == TIFF_ANY) /* wildcard */ - break; - fip = tif->tif_fieldinfo[++fix]; - if (fix >= tif->tif_nfields || - fip->field_tag != dp->tdir_tag) { - TIFFWarningExt(tif->tif_clientdata, module, - "%s: wrong data type %d for \"%s\"; tag ignored", - tif->tif_name, dp->tdir_type, - tif->tif_fieldinfo[fix-1]->field_name); - goto ignore; - } - } - /* - * Check count if known in advance. - */ - if (fip->field_readcount != TIFF_VARIABLE - && fip->field_readcount != TIFF_VARIABLE2) { - 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, (uint16)v)) - goto bad; - else - compressionknown = 1; - break; - /* XXX: workaround for broken TIFFs */ - } else if (dp->tdir_type == TIFF_LONG) { - if (!TIFFFetchPerSampleLongs(tif, dp, &v) || - !TIFFSetField(tif, dp->tdir_tag, (uint16)v)) - goto bad; - } else { - 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: - case TIFFTAG_EXTRASAMPLES: - if (!TIFFFetchNormalTag(tif, dp)) - goto bad; - dp->tdir_tag = IGNORE; - break; - } - } - - /* - * If we saw any unknown tags, make an extra pass over the directory - * to deal with them. This must be done separately because the tags - * could have become known when we registered a codec after finding - * the Compression tag. In a correctly-sorted directory there's - * no problem because Compression will come before any codec-private - * tags, but if the sorting is wrong that might not hold. - */ - if (haveunknowntags) { - fix = 0; - for (dp = dir, n = dircount; n > 0; n--, dp++) { - if (dp->tdir_tag == IGNORE) - continue; - if (fix >= tif->tif_nfields || - dp->tdir_tag < tif->tif_fieldinfo[fix]->field_tag) - 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) { - - TIFFWarningExt(tif->tif_clientdata, - module, - "%s: unknown field with tag %d (0x%x) encountered", - tif->tif_name, - dp->tdir_tag, - dp->tdir_tag); - - if (!_TIFFMergeFieldInfo(tif, - _TIFFCreateAnonFieldInfo(tif, - dp->tdir_tag, - (TIFFDataType) dp->tdir_type), - 1)) - { - TIFFWarningExt(tif->tif_clientdata, - module, - "Registering anonymous field with tag %d (0x%x) failed", - dp->tdir_tag, - dp->tdir_tag); - dp->tdir_tag = IGNORE; - continue; - } - fix = 0; - while (fix < tif->tif_nfields && - tif->tif_fieldinfo[fix]->field_tag < dp->tdir_tag) - fix++; - } - /* - * Check data type. - */ - fip = tif->tif_fieldinfo[fix]; - while (dp->tdir_type != (unsigned short) fip->field_type - && fix < tif->tif_nfields) { - if (fip->field_type == TIFF_ANY) /* wildcard */ - break; - fip = tif->tif_fieldinfo[++fix]; - if (fix >= tif->tif_nfields || - fip->field_tag != dp->tdir_tag) { - TIFFWarningExt(tif->tif_clientdata, module, - "%s: wrong data type %d for \"%s\"; tag ignored", - tif->tif_name, dp->tdir_type, - tif->tif_fieldinfo[fix-1]->field_name); - dp->tdir_tag = IGNORE; - break; - } - } - } - } - - /* - * XXX: OJPEG hack. - * If a) compression is OJPEG, b) planarconfig tag says it's separate, - * c) strip offsets/bytecounts tag are both present and - * d) both contain exactly one value, then we consistently find - * that the buggy implementation of the buggy compression scheme - * matches contig planarconfig best. So we 'fix-up' the tag here - */ - if ((td->td_compression==COMPRESSION_OJPEG) && - (td->td_planarconfig==PLANARCONFIG_SEPARATE)) { - dp = TIFFReadDirectoryFind(dir,dircount,TIFFTAG_STRIPOFFSETS); - if ((dp!=0) && (dp->tdir_count==1)) { - dp = TIFFReadDirectoryFind(dir, dircount, - TIFFTAG_STRIPBYTECOUNTS); - if ((dp!=0) && (dp->tdir_count==1)) { - td->td_planarconfig=PLANARCONFIG_CONTIG; - TIFFWarningExt(tif->tif_clientdata, - "TIFFReadDirectory", - "Planarconfig tag value assumed incorrect, " - "assuming data is contig instead of chunky"); - } - } - } - - /* - * Allocate directory structure and setup defaults. - */ - if (!TIFFFieldSet(tif, FIELD_IMAGEDIMENSIONS)) { - MissingRequired(tif, "ImageLength"); - 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; - } - if (!td->td_nstrips) { - TIFFErrorExt(tif->tif_clientdata, module, - "%s: cannot handle zero number of %s", - tif->tif_name, isTiled(tif) ? "tiles" : "strips"); - goto bad; - } - td->td_stripsperimage = td->td_nstrips; - if (td->td_planarconfig == PLANARCONFIG_SEPARATE) - td->td_stripsperimage /= td->td_samplesperpixel; - if (!TIFFFieldSet(tif, FIELD_STRIPOFFSETS)) { - if ((td->td_compression==COMPRESSION_OJPEG) && - (isTiled(tif)==0) && - (td->td_nstrips==1)) { - /* - * XXX: OJPEG hack. - * If a) compression is OJPEG, b) it's not a tiled TIFF, - * and c) the number of strips is 1, - * then we tolerate the absence of stripoffsets tag, - * because, presumably, all required data is in the - * JpegInterchangeFormat stream. - */ - TIFFSetFieldBit(tif, FIELD_STRIPOFFSETS); - } else { - 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: - case TIFFTAG_DATATYPE: - case TIFFTAG_SAMPLEFORMAT: - /* - * 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, BitsPerSample - * DataType and SampleFormat 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). Other vendors write correct - * value for NumberOfSamples, but incorrect one for - * BitsPerSample and friends, and we will read this - * too. - */ - if (dp->tdir_count == 1) { - v = TIFFExtractData(tif, - dp->tdir_type, dp->tdir_offset); - if (!TIFFSetField(tif, dp->tdir_tag, (uint16)v)) - goto bad; - /* XXX: workaround for broken TIFFs */ - } else if (dp->tdir_tag == TIFFTAG_BITSPERSAMPLE - && dp->tdir_type == TIFF_LONG) { - if (!TIFFFetchPerSampleLongs(tif, dp, &v) || - !TIFFSetField(tif, dp->tdir_tag, (uint16)v)) - goto bad; - } else { - if (!TIFFFetchPerSampleShorts(tif, dp, &iv) || - !TIFFSetField(tif, dp->tdir_tag, iv)) - goto bad; - } - break; - case TIFFTAG_SMINSAMPLEVALUE: - case TIFFTAG_SMAXSAMPLEVALUE: - { - double dv = 0.0; - 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: - { - char* cp; - /* - * 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 != v) { - if (!CheckDirCount(tif, dp, 3 * v)) - break; - } - v *= sizeof(uint16); - cp = (char *)_TIFFCheckMalloc(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 = 1L << td->td_bitspersample; - if (dp->tdir_count == c) - v = 0L; - 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; - case TIFFTAG_REFERENCEBLACKWHITE: - (void) TIFFFetchRefBlackWhite(tif, dp); - break; -/* BEGIN REV 4.0 COMPATIBILITY */ - case TIFFTAG_OSUBFILETYPE: - v = 0L; - 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) - TIFFSetField(tif, TIFFTAG_SUBFILETYPE, v); - break; -/* END REV 4.0 COMPATIBILITY */ - default: - (void) TIFFFetchNormalTag(tif, dp); - break; - } - } - /* - * OJPEG hack: - * - If a) compression is OJPEG, and b) photometric tag is missing, - * then we consistently find that photometric should be YCbCr - * - If a) compression is OJPEG, and b) photometric tag says it's RGB, - * then we consistently find that the buggy implementation of the - * buggy compression scheme matches photometric YCbCr instead. - * - If a) compression is OJPEG, and b) bitspersample tag is missing, - * then we consistently find bitspersample should be 8. - * - If a) compression is OJPEG, b) samplesperpixel tag is missing, - * and c) photometric is RGB or YCbCr, then we consistently find - * samplesperpixel should be 3 - * - If a) compression is OJPEG, b) samplesperpixel tag is missing, - * and c) photometric is MINISWHITE or MINISBLACK, then we consistently - * find samplesperpixel should be 3 - */ - if (td->td_compression==COMPRESSION_OJPEG) - { - if (!TIFFFieldSet(tif,FIELD_PHOTOMETRIC)) - { - TIFFWarningExt(tif->tif_clientdata, "TIFFReadDirectory", - "Photometric tag is missing, assuming data is YCbCr"); - if (!TIFFSetField(tif,TIFFTAG_PHOTOMETRIC,PHOTOMETRIC_YCBCR)) - goto bad; - } - else if (td->td_photometric==PHOTOMETRIC_RGB) - { - td->td_photometric=PHOTOMETRIC_YCBCR; - TIFFWarningExt(tif->tif_clientdata, "TIFFReadDirectory", - "Photometric tag value assumed incorrect, " - "assuming data is YCbCr instead of RGB"); - } - if (!TIFFFieldSet(tif,FIELD_BITSPERSAMPLE)) - { - TIFFWarningExt(tif->tif_clientdata,"TIFFReadDirectory", - "BitsPerSample tag is missing, assuming 8 bits per sample"); - if (!TIFFSetField(tif,TIFFTAG_BITSPERSAMPLE,8)) - goto bad; - } - if (!TIFFFieldSet(tif,FIELD_SAMPLESPERPIXEL)) - { - if ((td->td_photometric==PHOTOMETRIC_RGB) - || (td->td_photometric==PHOTOMETRIC_YCBCR)) - { - TIFFWarningExt(tif->tif_clientdata, - "TIFFReadDirectory", - "SamplesPerPixel tag is missing, " - "assuming correct SamplesPerPixel value is 3"); - if (!TIFFSetField(tif,TIFFTAG_SAMPLESPERPIXEL,3)) - goto bad; - } - else if ((td->td_photometric==PHOTOMETRIC_MINISWHITE) - || (td->td_photometric==PHOTOMETRIC_MINISBLACK)) - { - TIFFWarningExt(tif->tif_clientdata, - "TIFFReadDirectory", - "SamplesPerPixel tag is missing, " - "assuming correct SamplesPerPixel value is 1"); - if (!TIFFSetField(tif,TIFFTAG_SAMPLESPERPIXEL,1)) - goto bad; - } - } - } - /* - * Verify Palette image has a Colormap. - */ - if (td->td_photometric == PHOTOMETRIC_PALETTE && - !TIFFFieldSet(tif, FIELD_COLORMAP)) { - MissingRequired(tif, "Colormap"); - goto bad; - } - /* - * OJPEG hack: - * We do no further messing with strip/tile offsets/bytecounts in OJPEG - * TIFFs - */ - if (td->td_compression!=COMPRESSION_OJPEG) - { - /* - * 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; - } - TIFFWarningExt(tif->tif_clientdata, module, - "%s: 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); - * - it is smaller than the size of the bytes per row - * multiplied on the number of rows. The last case should - * not be checked in the case of writing new image, - * because we may do not know the exact strip size - * until the whole image will be written and directory - * dumped out. - */ - #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]) || \ - (tif->tif_mode == O_RDONLY && \ - td->td_compression == COMPRESSION_NONE && \ - td->td_stripbytecount[0] < TIFFScanlineSize(tif) * td->td_imagelength) ) - - } else if (td->td_nstrips == 1 - && td->td_stripoffset[0] != 0 - && BYTECOUNTLOOKSBAD) { - /* - * XXX: 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. - */ - TIFFWarningExt(tif->tif_clientdata, module, - "%s: 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; - } else if (td->td_planarconfig == PLANARCONFIG_CONTIG - && td->td_nstrips > 2 - && td->td_compression == COMPRESSION_NONE - && td->td_stripbytecount[0] != td->td_stripbytecount[1] - && td->td_stripbytecount[0] != 0 - && td->td_stripbytecount[1] != 0 ) { - /* - * XXX: Some vendors fill StripByteCount array with - * absolutely wrong values (it can be equal to - * StripOffset array, for example). Catch this case - * here. - */ - TIFFWarningExt(tif->tif_clientdata, module, - "%s: Wrong \"%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); - dir = NULL; - } - if (!TIFFFieldSet(tif, FIELD_MAXSAMPLEVALUE)) - td->td_maxsamplevalue = (uint16)((1L<<td->td_bitspersample)-1); - /* - * Setup default compression scheme. - */ - - /* - * XXX: We can optimize checking for the strip bounds using the sorted - * bytecounts array. See also comments for TIFFAppendToStrip() - * function in tif_write.c. - */ - if (td->td_nstrips > 1) { - tstrip_t strip; - - td->td_stripbytecountsorted = 1; - for (strip = 1; strip < td->td_nstrips; strip++) { - if (td->td_stripoffset[strip - 1] > - td->td_stripoffset[strip]) { - td->td_stripbytecountsorted = 0; - break; - } - } - } - - 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 = (tsize_t) -1; - - tif->tif_scanlinesize = TIFFScanlineSize(tif); - if (!tif->tif_scanlinesize) { - TIFFErrorExt(tif->tif_clientdata, module, - "%s: cannot handle zero scanline size", - tif->tif_name); - return (0); - } - - if (isTiled(tif)) { - tif->tif_tilesize = TIFFTileSize(tif); - if (!tif->tif_tilesize) { - TIFFErrorExt(tif->tif_clientdata, module, - "%s: cannot handle zero tile size", - tif->tif_name); - return (0); - } - } else { - if (!TIFFStripSize(tif)) { - TIFFErrorExt(tif->tif_clientdata, module, - "%s: cannot handle zero strip size", - tif->tif_name); - return (0); - } - } - return (1); -bad: - if (dir) - _TIFFfree(dir); - return (0); -} - -static TIFFDirEntry* -TIFFReadDirectoryFind(TIFFDirEntry* dir, uint16 dircount, uint16 tagid) -{ - TIFFDirEntry* m; - uint16 n; - for (m=dir, n=0; n<dircount; m++, n++) - { - if (m->tdir_tag==tagid) - return(m); - } - return(0); -} - -/* - * Read custom directory from the arbitarry offset. - * The code is very similar to TIFFReadDirectory(). - */ -int -TIFFReadCustomDirectory(TIFF* tif, toff_t diroff, - const TIFFFieldInfo info[], size_t n) -{ - static const char module[] = "TIFFReadCustomDirectory"; - - TIFFDirectory* td = &tif->tif_dir; - TIFFDirEntry *dp, *dir = NULL; - const TIFFFieldInfo* fip; - size_t fix; - uint16 i, dircount; - - _TIFFSetupFieldInfo(tif, info, n); - - dircount = TIFFFetchDirectory(tif, diroff, &dir, NULL); - if (!dircount) { - TIFFErrorExt(tif->tif_clientdata, module, - "%s: Failed to read custom directory at offset %u", - tif->tif_name, diroff); - return 0; - } - - TIFFFreeDirectory(tif); - _TIFFmemset(&tif->tif_dir, 0, sizeof(TIFFDirectory)); - - fix = 0; - for (dp = dir, i = dircount; i > 0; i--, dp++) { - if (tif->tif_flags & TIFF_SWAB) { - TIFFSwabArrayOfShort(&dp->tdir_tag, 2); - TIFFSwabArrayOfLong(&dp->tdir_count, 2); - } - - if (fix >= tif->tif_nfields || dp->tdir_tag == IGNORE) - continue; - - 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) { - - TIFFWarningExt(tif->tif_clientdata, module, - "%s: unknown field with tag %d (0x%x) encountered", - tif->tif_name, dp->tdir_tag, dp->tdir_tag); - if (!_TIFFMergeFieldInfo(tif, - _TIFFCreateAnonFieldInfo(tif, - dp->tdir_tag, - (TIFFDataType) dp->tdir_type), - 1)) - { - TIFFWarningExt(tif->tif_clientdata, module, - "Registering anonymous field with tag %d (0x%x) failed", - dp->tdir_tag, dp->tdir_tag); - goto ignore; - } - - 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 != (unsigned short) fip->field_type - && fix < tif->tif_nfields) { - if (fip->field_type == TIFF_ANY) /* wildcard */ - break; - fip = tif->tif_fieldinfo[++fix]; - if (fix >= tif->tif_nfields || - fip->field_tag != dp->tdir_tag) { - TIFFWarningExt(tif->tif_clientdata, module, - "%s: wrong data type %d for \"%s\"; tag ignored", - tif->tif_name, dp->tdir_type, - tif->tif_fieldinfo[fix-1]->field_name); - goto ignore; - } - } - /* - * Check count if known in advance. - */ - if (fip->field_readcount != TIFF_VARIABLE - && fip->field_readcount != TIFF_VARIABLE2) { - uint32 expected = (fip->field_readcount == TIFF_SPP) ? - (uint32) td->td_samplesperpixel : - (uint32) fip->field_readcount; - if (!CheckDirCount(tif, dp, expected)) - goto ignore; - } - - /* - * EXIF tags which need to be specifically processed. - */ - switch (dp->tdir_tag) { - case EXIFTAG_SUBJECTDISTANCE: - (void) TIFFFetchSubjectDistance(tif, dp); - break; - default: - (void) TIFFFetchNormalTag(tif, dp); - break; - } - } - - if (dir) - _TIFFfree(dir); - return 1; -} - -/* - * EXIF is important special case of custom IFD, so we have a special - * function to read it. - */ -int -TIFFReadEXIFDirectory(TIFF* tif, toff_t diroff) -{ - size_t exifFieldInfoCount; - const TIFFFieldInfo *exifFieldInfo = - _TIFFGetExifFieldInfo(&exifFieldInfoCount); - return TIFFReadCustomDirectory(tif, diroff, exifFieldInfo, - exifFieldInfoCount); -} - -static int -EstimateStripByteCounts(TIFF* tif, TIFFDirEntry* dir, uint16 dircount) -{ - static const char module[] = "EstimateStripByteCounts"; - - TIFFDirEntry *dp; - TIFFDirectory *td = &tif->tif_dir; - uint32 strip; - - if (td->td_stripbytecount) - _TIFFfree(td->td_stripbytecount); - td->td_stripbytecount = (uint32*) - _TIFFCheckMalloc(tif, td->td_nstrips, sizeof (uint32), - "for \"StripByteCounts\" array"); - if( td->td_stripbytecount == NULL ) - return -1; - - 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((TIFFDataType) dp->tdir_type); - if (cc == 0) { - TIFFErrorExt(tif->tif_clientdata, module, - "%s: 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 (strip = 0; strip < td->td_nstrips; strip++) - td->td_stripbytecount[strip] = 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. - */ - strip--; - if (((toff_t)(td->td_stripoffset[strip]+ - td->td_stripbytecount[strip])) > filesize) - td->td_stripbytecount[strip] = - filesize - td->td_stripoffset[strip]; - } else if (isTiled(tif)) { - uint32 bytespertile = TIFFTileSize(tif); - - for (strip = 0; strip < td->td_nstrips; strip++) - td->td_stripbytecount[strip] = bytespertile; - } else { - uint32 rowbytes = TIFFScanlineSize(tif); - uint32 rowsperstrip = td->td_imagelength/td->td_stripsperimage; - for (strip = 0; strip < td->td_nstrips; strip++) - td->td_stripbytecount[strip] = 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"; - - TIFFErrorExt(tif->tif_clientdata, module, - "%s: TIFF directory is missing required \"%s\" field", - tif->tif_name, tagname); -} - -/* - * Check the directory offset against the list of already seen directory - * offsets. This is a 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 that list. - */ -static int -TIFFCheckDirOffset(TIFF* tif, toff_t diroff) -{ - uint16 n; - - if (diroff == 0) /* no more directories */ - return 0; - - for (n = 0; n < tif->tif_dirnumber && tif->tif_dirlist; n++) { - if (tif->tif_dirlist[n] == diroff) - return 0; - } - - tif->tif_dirnumber++; - - if (tif->tif_dirnumber > tif->tif_dirlistsize) { - toff_t* new_dirlist; - - /* - * XXX: Reduce memory allocation granularity of the dirlist - * array. - */ - new_dirlist = (toff_t *)_TIFFCheckRealloc(tif, - tif->tif_dirlist, - tif->tif_dirnumber, - 2 * sizeof(toff_t), - "for IFD list"); - if (!new_dirlist) - return 0; - tif->tif_dirlistsize = 2 * tif->tif_dirnumber; - tif->tif_dirlist = new_dirlist; - } - - tif->tif_dirlist[tif->tif_dirnumber - 1] = diroff; - - return 1; -} - -/* - * 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) { - TIFFWarningExt(tif->tif_clientdata, tif->tif_name, - "incorrect count for field \"%s\" (%u, expecting %u); tag ignored", - _TIFFFieldWithTag(tif, dir->tdir_tag)->field_name, - dir->tdir_count, count); - return (0); - } else if (count < dir->tdir_count) { - TIFFWarningExt(tif->tif_clientdata, tif->tif_name, - "incorrect count for field \"%s\" (%u, expecting %u); tag trimmed", - _TIFFFieldWithTag(tif, dir->tdir_tag)->field_name, - dir->tdir_count, count); - return (1); - } - return (1); -} - -/* - * Read IFD structure from the specified offset. If the pointer to - * nextdiroff variable has been specified, read it too. Function returns a - * number of fields in the directory or 0 if failed. - */ -static uint16 -TIFFFetchDirectory(TIFF* tif, toff_t diroff, TIFFDirEntry **pdir, - toff_t *nextdiroff) -{ - static const char module[] = "TIFFFetchDirectory"; - - TIFFDirEntry *dir; - uint16 dircount; - - assert(pdir); - - tif->tif_diroff = diroff; - if (nextdiroff) - *nextdiroff = 0; - if (!isMapped(tif)) { - if (!SeekOK(tif, tif->tif_diroff)) { - TIFFErrorExt(tif->tif_clientdata, module, - "%s: Seek error accessing TIFF directory", - tif->tif_name); - return 0; - } - if (!ReadOK(tif, &dircount, sizeof (uint16))) { - TIFFErrorExt(tif->tif_clientdata, module, - "%s: Can not read TIFF directory count", - tif->tif_name); - return 0; - } - if (tif->tif_flags & TIFF_SWAB) - TIFFSwabShort(&dircount); - dir = (TIFFDirEntry *)_TIFFCheckMalloc(tif, dircount, - sizeof (TIFFDirEntry), - "to read TIFF directory"); - if (dir == NULL) - return 0; - if (!ReadOK(tif, dir, dircount*sizeof (TIFFDirEntry))) { - TIFFErrorExt(tif->tif_clientdata, module, - "%.100s: Can not read TIFF directory", - tif->tif_name); - _TIFFfree(dir); - return 0; - } - /* - * Read offset to next directory for sequential scans if - * needed. - */ - if (nextdiroff) - (void) ReadOK(tif, nextdiroff, sizeof(uint32)); - } else { - toff_t off = tif->tif_diroff; - - /* - * Check for integer overflow when validating the dir_off, - * otherwise a very high offset may cause an OOB read and - * crash the client. Make two comparisons instead of - * - * off + sizeof(uint16) > tif->tif_size - * - * to avoid overflow. - */ - if (tif->tif_size < sizeof (uint16) || - off > tif->tif_size - sizeof(uint16)) { - TIFFErrorExt(tif->tif_clientdata, module, - "%s: 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 *)_TIFFCheckMalloc(tif, dircount, - sizeof(TIFFDirEntry), - "to read TIFF directory"); - if (dir == NULL) - return 0; - if (off + dircount * sizeof (TIFFDirEntry) > tif->tif_size) { - TIFFErrorExt(tif->tif_clientdata, module, - "%s: Can not read TIFF directory", - tif->tif_name); - _TIFFfree(dir); - return 0; - } else { - _TIFFmemcpy(dir, tif->tif_base + off, - dircount * sizeof(TIFFDirEntry)); - } - if (nextdiroff) { - off += dircount * sizeof (TIFFDirEntry); - if (off + sizeof (uint32) <= tif->tif_size) { - _TIFFmemcpy(nextdiroff, tif->tif_base + off, - sizeof (uint32)); - } - } - } - if (nextdiroff && tif->tif_flags & TIFF_SWAB) - TIFFSwabLong(nextdiroff); - *pdir = dir; - return dircount; -} - -/* - * Fetch a contiguous directory item. - */ -static tsize_t -TIFFFetchData(TIFF* tif, TIFFDirEntry* dir, char* cp) -{ - uint32 w = TIFFDataWidth((TIFFDataType) dir->tdir_type); - /* - * FIXME: butecount should have tsize_t type, but for now libtiff - * defines tsize_t as a signed 32-bit integer and we are losing - * ability to read arrays larger than 2^31 bytes. So we are using - * uint32 instead of tsize_t here. - */ - uint32 cc = dir->tdir_count * w; - - /* Check for overflow. */ - if (!dir->tdir_count || !w || cc / w != dir->tdir_count) - goto bad; - - if (!isMapped(tif)) { - if (!SeekOK(tif, dir->tdir_offset)) - goto bad; - if (!ReadOK(tif, cp, cc)) - goto bad; - } else { - /* Check for overflow. */ - if (dir->tdir_offset + cc < dir->tdir_offset - || dir->tdir_offset + cc < cc - || 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: - TIFFErrorExt(tif->tif_clientdata, 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) { - TIFFErrorExt(tif->tif_clientdata, tif->tif_name, - "%s: Rational with zero denominator (num = %u)", - _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) -{ - float v; - int32 l = TIFFExtractData(tif, dir->tdir_type, dir->tdir_offset); - _TIFFmemcpy(&v, &l, sizeof(float)); - TIFFCvtIEEEFloatToNative(tif, 1, &v); - return (v); -} - -/* - * Fetch an array of BYTE or SBYTE values. - */ -static int -TIFFFetchByteArray(TIFF* tif, TIFFDirEntry* dir, uint8* 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] = dir->tdir_offset & 0xff; - case 3: v[2] = (dir->tdir_offset >> 8) & 0xff; - case 2: v[1] = (dir->tdir_offset >> 16) & 0xff; - case 1: v[0] = dir->tdir_offset >> 24; - } - else - switch (dir->tdir_count) { - case 4: v[3] = dir->tdir_offset & 0xff; - case 3: v[2] = (dir->tdir_offset >> 8) & 0xff; - case 2: v[1] = (dir->tdir_offset >> 16) & 0xff; - case 1: v[0] = dir->tdir_offset >> 24; - } - } else { - if (dir->tdir_type == TIFF_SBYTE) - switch (dir->tdir_count) { - case 4: v[3] = dir->tdir_offset >> 24; - case 3: v[2] = (dir->tdir_offset >> 16) & 0xff; - case 2: v[1] = (dir->tdir_offset >> 8) & 0xff; - case 1: v[0] = dir->tdir_offset & 0xff; - } - else - switch (dir->tdir_count) { - case 4: v[3] = dir->tdir_offset >> 24; - case 3: v[2] = (dir->tdir_offset >> 16) & 0xff; - case 2: v[1] = (dir->tdir_offset >> 8) & 0xff; - case 1: v[0] = 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. Some tags may have either BYTE - * or SHORT type and this function works with both ones. - */ -static int -TIFFFetchShortPair(TIFF* tif, TIFFDirEntry* dir) -{ - /* - * Prevent overflowing the v stack arrays below by performing a sanity - * check on tdir_count, this should never be greater than two. - */ - if (dir->tdir_count > 2) { - TIFFWarningExt(tif->tif_clientdata, tif->tif_name, - "unexpected count for field \"%s\", %u, expected 2; ignored", - _TIFFFieldWithTag(tif, dir->tdir_tag)->field_name, - dir->tdir_count); - return 0; - } - - switch (dir->tdir_type) { - case TIFF_BYTE: - case TIFF_SBYTE: - { - uint8 v[4]; - return TIFFFetchByteArray(tif, dir, v) - && TIFFSetField(tif, dir->tdir_tag, v[0], v[1]); - } - case TIFF_SHORT: - case TIFF_SSHORT: - { - uint16 v[2]; - return TIFFFetchShortArray(tif, dir, v) - && TIFFSetField(tif, dir->tdir_tag, v[0], v[1]); - } - default: - return 0; - } -} - -/* - * 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*)_TIFFCheckMalloc(tif, - dir->tdir_count, TIFFDataWidth((TIFFDataType) 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) { - union - { - float f; - uint32 i; - } float_union; - - float_union.i=dir->tdir_offset; - v[0]=float_union.f; - 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, (uint8*) v)) - return (0); - if (dir->tdir_type == TIFF_BYTE) { - uint8* vp = (uint8*) v; - for (i = dir->tdir_count-1; i >= 0; i--) - v[i] = vp[i]; - } else { - int8* vp = (int8*) 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 */ - TIFFErrorExt(tif->tif_clientdata, tif->tif_name, - "cannot read TIFF_ANY type %d for field \"%s\"", - dir->tdir_type, - _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: - cp = (char *)_TIFFCheckMalloc(tif, - dp->tdir_count, sizeof (uint8), mesg); - ok = cp && TIFFFetchByteArray(tif, dp, (uint8*) cp); - break; - case TIFF_SHORT: - case TIFF_SSHORT: - cp = (char *)_TIFFCheckMalloc(tif, - dp->tdir_count, sizeof (uint16), mesg); - ok = cp && TIFFFetchShortArray(tif, dp, (uint16*) cp); - break; - case TIFF_LONG: - case TIFF_SLONG: - cp = (char *)_TIFFCheckMalloc(tif, - dp->tdir_count, sizeof (uint32), mesg); - ok = cp && TIFFFetchLongArray(tif, dp, (uint32*) cp); - break; - case TIFF_RATIONAL: - case TIFF_SRATIONAL: - cp = (char *)_TIFFCheckMalloc(tif, - dp->tdir_count, sizeof (float), mesg); - ok = cp && TIFFFetchRationalArray(tif, dp, (float*) cp); - break; - case TIFF_FLOAT: - cp = (char *)_TIFFCheckMalloc(tif, - dp->tdir_count, sizeof (float), mesg); - ok = cp && TIFFFetchFloatArray(tif, dp, (float*) cp); - break; - case TIFF_DOUBLE: - cp = (char *)_TIFFCheckMalloc(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 = (char *)_TIFFCheckMalloc(tif, dp->tdir_count + 1, - 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 = (fip->field_passcount ? - TIFFSetField(tif, dp->tdir_tag, 1, c) - : 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, uint16* pl) -{ - uint16 samples = tif->tif_dir.td_samplesperpixel; - int status = 0; - - if (CheckDirCount(tif, dir, (uint32) samples)) { - uint16 buf[10]; - uint16* v = buf; - - if (dir->tdir_count > NITEMS(buf)) - v = (uint16*) _TIFFCheckMalloc(tif, dir->tdir_count, sizeof(uint16), - "to fetch per-sample values"); - if (v && TIFFFetchShortArray(tif, dir, v)) { - uint16 i; - int check_count = dir->tdir_count; - if( samples < check_count ) - check_count = samples; - - for (i = 1; i < check_count; i++) - if (v[i] != v[0]) { - TIFFErrorExt(tif->tif_clientdata, 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 && v != buf) - _TIFFfree(v); - } - return (status); -} - -/* - * Fetch samples/pixel long values for - * the specified tag and verify that - * all values are the same. - */ -static int -TIFFFetchPerSampleLongs(TIFF* tif, TIFFDirEntry* dir, uint32* pl) -{ - uint16 samples = tif->tif_dir.td_samplesperpixel; - int status = 0; - - if (CheckDirCount(tif, dir, (uint32) samples)) { - uint32 buf[10]; - uint32* v = buf; - - if (dir->tdir_count > NITEMS(buf)) - v = (uint32*) _TIFFCheckMalloc(tif, dir->tdir_count, sizeof(uint32), - "to fetch per-sample values"); - if (v && TIFFFetchLongArray(tif, dir, v)) { - uint16 i; - int check_count = dir->tdir_count; - - if( samples < check_count ) - check_count = samples; - for (i = 1; i < check_count; i++) - if (v[i] != v[0]) { - TIFFErrorExt(tif->tif_clientdata, 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 && v != buf) - _TIFFfree(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) -{ - uint16 samples = tif->tif_dir.td_samplesperpixel; - int status = 0; - - if (CheckDirCount(tif, dir, (uint32) samples)) { - double buf[10]; - double* v = buf; - - if (dir->tdir_count > NITEMS(buf)) - v = (double*) _TIFFCheckMalloc(tif, dir->tdir_count, sizeof (double), - "to fetch per-sample values"); - if (v && TIFFFetchAnyArray(tif, dir, v)) { - uint16 i; - int check_count = dir->tdir_count; - if( samples < check_count ) - check_count = samples; - - for (i = 1; i < check_count; i++) - if (v[i] != v[0]) { - TIFFErrorExt(tif->tif_clientdata, 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 && 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 *)_TIFFCheckMalloc(tif, - nstrips, sizeof (uint32), "for strip array")) == NULL) - return (0); - lp = *lpp; - _TIFFmemset( lp, 0, sizeof(uint32) * nstrips ); - - if (dir->tdir_type == (int)TIFF_SHORT) { - /* - * Handle uint16->uint32 expansion. - */ - uint16* dp = (uint16*) _TIFFCheckMalloc(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*) _TIFFCheckMalloc(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); -} - -/* - * 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 = (char *)_TIFFCheckMalloc(tif, dir->tdir_count, - sizeof (uint32), mesg); - if( (ok = (cp && TIFFFetchLongArray(tif, dir, (uint32*) cp))) != 0) { - float* fp = (float*) - _TIFFCheckMalloc(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); -} - -/* - * Fetch and set the SubjectDistance EXIF tag. - */ -static int -TIFFFetchSubjectDistance(TIFF* tif, TIFFDirEntry* dir) -{ - uint32 l[2]; - float v; - int ok = 0; - - if( dir->tdir_count != 1 || dir->tdir_type != TIFF_RATIONAL ) - { - TIFFWarningExt(tif->tif_clientdata, tif->tif_name, - "incorrect count or type for SubjectDistance, tag ignored" ); - return (0); - } - - if (TIFFFetchData(tif, dir, (char *)l) - && cvtRational(tif, dir, l[0], l[1], &v)) { - /* - * XXX: Numerator 0xFFFFFFFF means that we have infinite - * distance. Indicate that with a negative floating point - * SubjectDistance value. - */ - ok = TIFFSetField(tif, dir->tdir_tag, - (l[0] != 0xFFFFFFFF) ? v : -v); - } - - return ok; -} - -/* - * Replace a single strip (tile) of uncompressed data by multiple strips - * (tiles), each approximately STRIP_SIZE_DEFAULT bytes. 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 specified amount - * of data if possible. - */ - if (rowbytes > STRIP_SIZE_DEFAULT) { - stripbytes = rowbytes; - rowsperstrip = 1; - } else if (rowbytes > 0 ) { - rowsperstrip = STRIP_SIZE_DEFAULT / 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); - if( nstrips == 0 ) /* something is wonky, do nothing. */ - return; - - newcounts = (uint32*) _TIFFCheckMalloc(tif, nstrips, sizeof (uint32), - "for chopped \"StripByteCounts\" array"); - newoffsets = (uint32*) _TIFFCheckMalloc(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 ((uint32)stripbytes > 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; - td->td_stripbytecountsorted = 1; -} - -/* vim: set ts=8 sts=8 sw=8 noet: */ -/* - * Local Variables: - * mode: c - * c-basic-offset: 8 - * fill-column: 78 - * End: - */ |