/* Id */ /* * 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 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*, 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 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 TEXPORT 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; toff_t nextdiroff; int diroutoforderwarning = 0; toff_t* new_dirlist; 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++; new_dirlist = (toff_t *)_TIFFrealloc(tif->tif_dirlist, tif->tif_dirnumber * sizeof(toff_t)); if (!new_dirlist) { TIFFErrorExt(tif->tif_clientdata, module, "%s: Failed to allocate space for IFD list", tif->tif_name); return (0); } tif->tif_dirlist = new_dirlist; 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)) { 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); 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) { 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); 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++) { 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) { 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) { TIFFWarningExt(tif->tif_clientdata, module, "%s: unknown field with tag %d (0x%x) encountered", tif->tif_name, dp->tdir_tag, dp->tdir_tag, dp->tdir_type); TIFFMergeFieldInfo(tif, _TIFFCreateAnonFieldInfo(tif, dp->tdir_tag, (TIFFDataType) 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 != (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; 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; } } /* * 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)) { 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_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; } } /* * 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; } 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]) { /* * 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_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); } /* * 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); tif->tif_diroff = diroff; if (!isMapped(tif)) { if (!SeekOK(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 custom 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); goto bad; } } else { toff_t off = diroff; if (off + sizeof (uint16) > tif->tif_size) { 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 custom 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); goto bad; } else { _TIFFmemcpy(dir, tif->tif_base + off, dircount * sizeof (TIFFDirEntry)); } } TIFFFreeDirectory(tif); 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, dp->tdir_type); TIFFMergeFieldInfo(tif, _TIFFCreateAnonFieldInfo(tif, dp->tdir_tag, (TIFFDataType)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 != (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; } (void) TIFFFetchNormalTag(tif, dp); } if (dir) _TIFFfree(dir); return 1; bad: if (dir) _TIFFfree(dir); return 0; } /* * 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"; register TIFFDirEntry *dp; register TIFFDirectory *td = &tif->tif_dir; uint16 i; 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_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 (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"; TIFFErrorExt(tif->tif_clientdata, module, "%s: 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) { TIFFWarningExt(tif->tif_clientdata, 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); } else if (count < dir->tdir_count) { TIFFWarningExt(tif->tif_clientdata, tif->tif_name, "incorrect count for field \"%s\" (%lu, expecting %lu); tag trimmed", _TIFFFieldWithTag(tif, dir->tdir_tag)->field_name, dir->tdir_count, count); return (1); } return (1); } /* * Fetch a contiguous directory item. */ static tsize_t TIFFFetchData(TIFF* tif, TIFFDirEntry* dir, char* cp) { int w = TIFFDataWidth((TIFFDataType) dir->tdir_type); tsize_t cc = dir->tdir_count * w; /* Check for overflow. */ if (!dir->tdir_count || !w || cc / w != (tsize_t)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 ((tsize_t)dir->tdir_offset + cc < (tsize_t)dir->tdir_offset || (tsize_t)dir->tdir_offset + cc < cc || (tsize_t)dir->tdir_offset + cc > (tsize_t)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 = %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) { 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, 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. Some tags may have either BYTE * or SHORT type and this function works with both ones. */ static int TIFFFetchShortPair(TIFF* tif, TIFFDirEntry* dir) { switch (dir->tdir_type) { case TIFF_BYTE: case TIFF_SBYTE: { uint16 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) { 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) { 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: /* NB: always expand BYTE values to shorts */ cp = (char *)_TIFFCheckMalloc(tif, dp->tdir_count, sizeof (uint16), mesg); ok = cp && TIFFFetchByteArray(tif, dp, (uint16*) 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); } /* * 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 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 (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; td->td_stripbytecountsorted = 1; } /* vim: set ts=8 sts=8 sw=8 noet: */