/*
* 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 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));
}
/*
* Read the next TIFF directory from a file
* and convert it to the internal format.
* We read directories sequentially.
*/
int
TIFFReadDirectory(TIFF* tif)
{
register TIFFDirEntry* dp;
register int n;
register TIFFDirectory* td;
TIFFDirEntry* dir;
int iv;
long v;
double dv;
const TIFFFieldInfo* fip;
int fix;
uint16 dircount;
toff_t nextdiroff;
char* cp;
int diroutoforderwarning = 0;
tif->tif_diroff = tif->tif_nextdiroff;
if (tif->tif_diroff == 0) /* no more directories */
return (0);
/*
* Cleanup any previous compression state.
*/
(*tif->tif_cleanup)(tif);
tif->tif_curdir++;
nextdiroff = 0;
if (!isMapped(tif)) {
if (!SeekOK(tif, tif->tif_diroff)) {
TIFFError(tif->tif_name,
"Seek error accessing TIFF directory");
return (0);
}
if (!ReadOK(tif, &dircount, sizeof (uint16))) {
TIFFError(tif->tif_name,
"Can not read TIFF directory count");
return (0);
}
if (tif->tif_flags & TIFF_SWAB)
TIFFSwabShort(&dircount);
dir = (TIFFDirEntry *)CheckMalloc(tif,
dircount * sizeof (TIFFDirEntry), "to read TIFF directory");
if (dir == NULL)
return (0);
if (!ReadOK(tif, dir, dircount*sizeof (TIFFDirEntry))) {
TIFFError(tif->tif_name, "Can not read TIFF directory");
goto bad;
}
/*
* Read offset to next directory for sequential scans.
*/
(void) ReadOK(tif, &nextdiroff, sizeof (uint32));
} else {
toff_t off = tif->tif_diroff;
if (off + sizeof (uint16) > tif->tif_size) {
TIFFError(tif->tif_name,
"Can not read TIFF directory count");
return (0);
} else
_TIFFmemcpy(&dircount, tif->tif_base + off, sizeof (uint16));
off += sizeof (uint16);
if (tif->tif_flags & TIFF_SWAB)
TIFFSwabShort(&dircount);
dir = (TIFFDirEntry *)CheckMalloc(tif,
dircount * sizeof (TIFFDirEntry), "to read TIFF directory");
if (dir == NULL)
return (0);
if (off + dircount*sizeof (TIFFDirEntry) > tif->tif_size) {
TIFFError(tif->tif_name, "Can not read TIFF directory");
goto bad;
} else
_TIFFmemcpy(dir, tif->tif_base + off,
dircount*sizeof (TIFFDirEntry));
off += dircount* sizeof (TIFFDirEntry);
if (off + sizeof (uint32) <= tif->tif_size)
_TIFFmemcpy(&nextdiroff, tif->tif_base+off, sizeof (uint32));
}
if (tif->tif_flags & TIFF_SWAB)
TIFFSwabLong(&nextdiroff);
tif->tif_nextdiroff = nextdiroff;
tif->tif_flags &= ~TIFF_BEENWRITING; /* reset before new dir */
/*
* Setup default value and then make a pass over
* the fields to check type and tag information,
* and to extract info required to size data
* structures. A second pass is made afterwards
* to read in everthing not taken in the first pass.
*/
td = &tif->tif_dir;
/* free any old stuff and reinit */
TIFFFreeDirectory(tif);
TIFFDefaultDirectory(tif);
/*
* Electronic Arts writes gray-scale TIFF files
* without a PlanarConfiguration directory entry.
* Thus we setup a default value here, even though
* the TIFF spec says there is no default value.
*/
TIFFSetField(tif, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
/*
* Sigh, we must make a separate pass through the
* directory for the following reason:
*
* We must process the Compression tag in the first pass
* in order to merge in codec-private tag definitions (otherwise
* we may get complaints about unknown tags). However, the
* Compression tag may be dependent on the SamplesPerPixel
* tag value because older TIFF specs permited Compression
* to be written as a SamplesPerPixel-count tag entry.
* Thus if we don't first figure out the correct SamplesPerPixel
* tag value then we may end up ignoring the Compression tag
* value because it has an incorrect count value (if the
* true value of SamplesPerPixel is not 1).
*
* It sure would have been nice if Aldus had really thought
* this stuff through carefully.
*/
for (dp = dir, n = dircount; n > 0; n--, dp++) {
if (tif->tif_flags & TIFF_SWAB) {
TIFFSwabArrayOfShort(&dp->tdir_tag, 2);
TIFFSwabArrayOfLong(&dp->tdir_count, 2);
}
if (dp->tdir_tag == TIFFTAG_SAMPLESPERPIXEL) {
if (!TIFFFetchNormalTag(tif, dp))
goto bad;
dp->tdir_tag = IGNORE;
}
}
/*
* First real pass over the directory.
*/
fix = 0;
for (dp = dir, n = dircount; n > 0; n--, dp++) {
/*
* Find the field information entry for this tag.
* Added check for tags to ignore ... [BFC]
*/
if( TIFFReassignTagToIgnore(TIS_EXTRACT, dp->tdir_tag) )
dp->tdir_tag = IGNORE;
if (dp->tdir_tag == IGNORE)
continue;
/*
* Silicon Beach (at least) writes unordered
* directory tags (violating the spec). Handle
* it here, but be obnoxious (maybe they'll fix it?).
*/
if (dp->tdir_tag < tif->tif_fieldinfo[fix]->field_tag) {
if (!diroutoforderwarning) {
TIFFWarning(tif->tif_name,
"invalid TIFF directory; tags are not sorted in ascending order");
diroutoforderwarning = 1;
}
fix = 0; /* O(n^2) */
}
while (fix < tif->tif_nfields &&
tif->tif_fieldinfo[fix]->field_tag < dp->tdir_tag)
fix++;
if (fix == tif->tif_nfields ||
tif->tif_fieldinfo[fix]->field_tag != dp->tdir_tag) {
TIFFWarning(tif->tif_name,
"unknown field with tag %d (0x%x) ignored",
dp->tdir_tag, dp->tdir_tag);
dp->tdir_tag = IGNORE;
fix = 0; /* restart search */
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 != (u_short) fip->field_type) {
if (fip->field_type == TIFF_ANY) /* wildcard */
break;
fip++, fix++;
if (fix == tif->tif_nfields ||
fip->field_tag != dp->tdir_tag) {
TIFFWarning(tif->tif_name,
"wrong data type %d for \"%s\"; tag ignored",
dp->tdir_type, fip[-1].field_name);
goto ignore;
}
}
/*
* Check count if known in advance.
*/
if (fip->field_readcount != TIFF_VARIABLE) {
uint32 expected = (fip->field_readcount == TIFF_SPP) ?
(uint32) td->td_samplesperpixel :
(uint32) fip->field_readcount;
if (!CheckDirCount(tif, dp, expected))
goto ignore;
}
switch (dp->tdir_tag) {
case TIFFTAG_COMPRESSION:
/*
* The 5.0 spec says the Compression tag has
* one value, while earlier specs say it has
* one value per sample. Because of this, we
* accept the tag if one value is supplied.
*/
if (dp->tdir_count == 1) {
v = TIFFExtractData(tif,
dp->tdir_type, dp->tdir_offset);
if (!TIFFSetField(tif, dp->tdir_tag, (int)v))
goto bad;
break;
}
if (!TIFFFetchPerSampleShorts(tif, dp, &iv) ||
!TIFFSetField(tif, dp->tdir_tag, iv))
goto bad;
dp->tdir_tag = IGNORE;
break;
case TIFFTAG_STRIPOFFSETS:
case TIFFTAG_STRIPBYTECOUNTS:
case TIFFTAG_TILEOFFSETS:
case TIFFTAG_TILEBYTECOUNTS:
TIFFSetFieldBit(tif, fip->field_bit);
break;
case TIFFTAG_IMAGEWIDTH:
case TIFFTAG_IMAGELENGTH:
case TIFFTAG_IMAGEDEPTH:
case TIFFTAG_TILELENGTH:
case TIFFTAG_TILEWIDTH:
case TIFFTAG_TILEDEPTH:
case TIFFTAG_PLANARCONFIG:
case TIFFTAG_ROWSPERSTRIP:
if (!TIFFFetchNormalTag(tif, dp))
goto bad;
dp->tdir_tag = IGNORE;
break;
case TIFFTAG_EXTRASAMPLES:
(void) TIFFFetchExtraSamples(tif, dp);
dp->tdir_tag = IGNORE;
break;
}
}
/*
* Allocate directory structure and setup defaults.
*/
if (!TIFFFieldSet(tif, FIELD_IMAGEDIMENSIONS)) {
MissingRequired(tif, "ImageLength");
goto bad;
}
if (!TIFFFieldSet(tif, FIELD_PLANARCONFIG)) {
MissingRequired(tif, "PlanarConfiguration");
goto bad;
}
/*
* Setup appropriate structures (by strip or by tile)
*/
if (!TIFFFieldSet(tif, FIELD_TILEDIMENSIONS)) {
td->td_nstrips = TIFFNumberOfStrips(tif);
td->td_tilewidth = td->td_imagewidth;
td->td_tilelength = td->td_rowsperstrip;
td->td_tiledepth = td->td_imagedepth;
tif->tif_flags &= ~TIFF_ISTILED;
} else {
td->td_nstrips = TIFFNumberOfTiles(tif);
tif->tif_flags |= TIFF_ISTILED;
}
td->td_stripsperimage = td->td_nstrips;
if (td->td_planarconfig == PLANARCONFIG_SEPARATE)
td->td_stripsperimage /= td->td_samplesperpixel;
if (!TIFFFieldSet(tif, FIELD_STRIPOFFSETS)) {
MissingRequired(tif,
isTiled(tif) ? "TileOffsets" : "StripOffsets");
goto bad;
}
/*
* Second pass: extract other information.
*/
for (dp = dir, n = dircount; n > 0; n--, dp++) {
if (dp->tdir_tag == IGNORE)
continue;
switch (dp->tdir_tag) {
case TIFFTAG_MINSAMPLEVALUE:
case TIFFTAG_MAXSAMPLEVALUE:
case TIFFTAG_BITSPERSAMPLE:
/*
* The 5.0 spec says the Compression tag has
* one value, while earlier specs say it has
* one value per sample. Because of this, we
* accept the tag if one value is supplied.
*
* The MinSampleValue, MaxSampleValue and
* BitsPerSample tags are supposed to be written
* as one value/sample, but some vendors incorrectly
* write one value only -- so we accept that
* as well (yech).
*/
if (dp->tdir_count == 1) {
v = TIFFExtractData(tif,
dp->tdir_type, dp->tdir_offset);
if (!TIFFSetField(tif, dp->tdir_tag, (int)v))
goto bad;
break;
}
/* fall thru... */
case TIFFTAG_DATATYPE:
case TIFFTAG_SAMPLEFORMAT:
if (!TIFFFetchPerSampleShorts(tif, dp, &iv) ||
!TIFFSetField(tif, dp->tdir_tag, iv))
goto bad;
break;
case TIFFTAG_SMINSAMPLEVALUE:
case TIFFTAG_SMAXSAMPLEVALUE:
if (!TIFFFetchPerSampleAnys(tif, dp, &dv) ||
!TIFFSetField(tif, dp->tdir_tag, dv))
goto bad;
break;
case TIFFTAG_STRIPOFFSETS:
case TIFFTAG_TILEOFFSETS:
if (!TIFFFetchStripThing(tif, dp,
td->td_nstrips, &td->td_stripoffset))
goto bad;
break;
case TIFFTAG_STRIPBYTECOUNTS:
case TIFFTAG_TILEBYTECOUNTS:
if (!TIFFFetchStripThing(tif, dp,
td->td_nstrips, &td->td_stripbytecount))
goto bad;
break;
case TIFFTAG_COLORMAP:
case TIFFTAG_TRANSFERFUNCTION:
/*
* TransferFunction can have either 1x or 3x data
* values; Colormap can have only 3x items.
*/
v = 1L<<td->td_bitspersample;
if (dp->tdir_tag == TIFFTAG_COLORMAP ||
dp->tdir_count != (uint32) v) {
if (!CheckDirCount(tif, dp, (uint32)(3*v)))
break;
}
v *= sizeof (uint16);
cp = CheckMalloc(tif, dp->tdir_count * sizeof (uint16),
"to read \"TransferFunction\" tag");
if (cp != NULL) {
if (TIFFFetchData(tif, dp, cp)) {
/*
* This deals with there being only
* one array to apply to all samples.
*/
uint32 c =
(uint32)1 << td->td_bitspersample;
if (dp->tdir_count == c)
v = 0;
TIFFSetField(tif, dp->tdir_tag,
cp, cp+v, cp+2*v);
}
_TIFFfree(cp);
}
break;
case TIFFTAG_PAGENUMBER:
case TIFFTAG_HALFTONEHINTS:
case TIFFTAG_YCBCRSUBSAMPLING:
case TIFFTAG_DOTRANGE:
(void) TIFFFetchShortPair(tif, dp);
break;
#ifdef COLORIMETRY_SUPPORT
case TIFFTAG_REFERENCEBLACKWHITE:
(void) TIFFFetchRefBlackWhite(tif, dp);
break;
#endif
/* BEGIN REV 4.0 COMPATIBILITY */
case TIFFTAG_OSUBFILETYPE:
v = 0;
switch (TIFFExtractData(tif, dp->tdir_type,
dp->tdir_offset)) {
case OFILETYPE_REDUCEDIMAGE:
v = FILETYPE_REDUCEDIMAGE;
break;
case OFILETYPE_PAGE:
v = FILETYPE_PAGE;
break;
}
if (v)
(void) TIFFSetField(tif,
TIFFTAG_SUBFILETYPE, (int)v);
break;
/* END REV 4.0 COMPATIBILITY */
default:
(void) TIFFFetchNormalTag(tif, dp);
break;
}
}
/*
* Verify Palette image has a Colormap.
*/
if (td->td_photometric == PHOTOMETRIC_PALETTE &&
!TIFFFieldSet(tif, FIELD_COLORMAP)) {
MissingRequired(tif, "Colormap");
goto bad;
}
/*
* Attempt to deal with a missing StripByteCounts tag.
*/
if (!TIFFFieldSet(tif, FIELD_STRIPBYTECOUNTS)) {
/*
* Some manufacturers violate the spec by not giving
* the size of the strips. In this case, assume there
* is one uncompressed strip of data.
*/
if ((td->td_planarconfig == PLANARCONFIG_CONTIG &&
td->td_nstrips > 1) ||
(td->td_planarconfig == PLANARCONFIG_SEPARATE &&
td->td_nstrips != td->td_samplesperpixel)) {
MissingRequired(tif, "StripByteCounts");
goto bad;
}
TIFFWarning(tif->tif_name,
"TIFF directory is missing required \"%s\" field, calculating from imagelength",
_TIFFFieldWithTag(tif,TIFFTAG_STRIPBYTECOUNTS)->field_name);
EstimateStripByteCounts(tif, dir, dircount);
#define BYTECOUNTLOOKSBAD \
((td->td_stripbytecount[0] == 0 && td->td_stripoffset[0] != 0) || \
(td->td_compression == COMPRESSION_NONE && \
td->td_stripbytecount[0] > TIFFGetFileSize(tif) - td->td_stripoffset[0]))
} else if (td->td_nstrips == 1 && BYTECOUNTLOOKSBAD) {
/*
* Plexus (and others) sometimes give a value
* of zero for a tag when they don't know what
* the correct value is! Try and handle the
* simple case of estimating the size of a one
* strip image.
*/
TIFFWarning(tif->tif_name,
"Bogus \"%s\" field, ignoring and calculating from imagelength",
_TIFFFieldWithTag(tif,TIFFTAG_STRIPBYTECOUNTS)->field_name);
EstimateStripByteCounts(tif, dir, dircount);
}
if (dir)
_TIFFfree((char *)dir);
if (!TIFFFieldSet(tif, FIELD_MAXSAMPLEVALUE))
td->td_maxsamplevalue = (uint16)((1L<<td->td_bitspersample)-1);
/*
* Setup default compression scheme.
*/
if (!TIFFFieldSet(tif, FIELD_COMPRESSION))
TIFFSetField(tif, TIFFTAG_COMPRESSION, COMPRESSION_NONE);
/*
* Some manufacturers make life difficult by writing
* large amounts of uncompressed data as a single strip.
* This is contrary to the recommendations of the spec.
* The following makes an attempt at breaking such images
* into strips closer to the recommended 8k bytes. A
* side effect, however, is that the RowsPerStrip tag
* value may be changed.
*/
if (td->td_nstrips == 1 && td->td_compression == COMPRESSION_NONE &&
(tif->tif_flags & (TIFF_STRIPCHOP|TIFF_ISTILED)) == TIFF_STRIPCHOP)
ChopUpSingleUncompressedStrip(tif);
/*
* Reinitialize i/o since we are starting on a new directory.
*/
tif->tif_row = (uint32) -1;
tif->tif_curstrip = (tstrip_t) -1;
tif->tif_col = (uint32) -1;
tif->tif_curtile = (ttile_t) -1;
tif->tif_tilesize = TIFFTileSize(tif);
tif->tif_scanlinesize = TIFFScanlineSize(tif);
return (1);
bad:
if (dir)
_TIFFfree(dir);
return (0);
}
/*
* Read the next TIFF directory from a file
* and convert it to the internal format.
* We read directories sequentially.
*/
static uint32
ReadDirectory(int fd, unsigned ix, uint32 off)
{
register TIFFDirEntry *dp;
register int n;
TIFFDirEntry *dir = 0;
uint16 dircount;
int space;
uint32 nextdiroff = 0;
if (off == 0) /* no more directories */
goto done;
if (lseek(fd, (off_t) off, 0) != off) {
Fatal("Seek error accessing TIFF directory");
goto done;
}
if (read(fd, (char*) &dircount, sizeof (uint16)) != sizeof (uint16)) {
ReadError("directory count");
goto done;
}
if (swabflag)
TIFFSwabShort(&dircount);
dir = (TIFFDirEntry *)_TIFFmalloc(dircount * sizeof (TIFFDirEntry));
if (dir == NULL) {
Fatal("No space for TIFF directory");
goto done;
}
n = read(fd, (char*) dir, dircount*sizeof (*dp));
if (n != dircount*sizeof (*dp)) {
n /= sizeof (*dp);
Error(
"Could only read %u of %u entries in directory at offset %#lx",
n, dircount, (unsigned long) off);
dircount = n;
}
if (read(fd, (char*) &nextdiroff, sizeof (uint32)) != sizeof (uint32))
nextdiroff = 0;
if (swabflag)
TIFFSwabLong(&nextdiroff);
printf("Directory %u: offset %lu (%#lx) next %lu (%#lx)\n", ix,
(unsigned long) off, (unsigned long) off,
(unsigned long) nextdiroff, (unsigned long) nextdiroff);
for (dp = dir, n = dircount; n > 0; n--, dp++) {
if (swabflag) {
TIFFSwabArrayOfShort(&dp->tdir_tag, 2);
TIFFSwabArrayOfLong(&dp->tdir_count, 2);
}
PrintTag(stdout, dp->tdir_tag);
putchar(' ');
PrintType(stdout, dp->tdir_type);
putchar(' ');
printf("%lu<", (unsigned long) dp->tdir_count);
if (dp->tdir_type >= NWIDTHS) {
printf(">\n");
continue;
}
space = dp->tdir_count * datawidth[dp->tdir_type];
if (space <= 4) {
switch (dp->tdir_type) {
case TIFF_FLOAT:
case TIFF_UNDEFINED:
case TIFF_ASCII: {
unsigned char data[4];
_TIFFmemcpy(data, &dp->tdir_offset, 4);
if (swabflag)
TIFFSwabLong((uint32*) data);
PrintData(stdout,
dp->tdir_type, dp->tdir_count, data);
break;
}
case TIFF_BYTE:
PrintByte(stdout, bytefmt, dp);
break;
case TIFF_SBYTE:
PrintByte(stdout, sbytefmt, dp);
break;
case TIFF_SHORT:
PrintShort(stdout, shortfmt, dp);
break;
case TIFF_SSHORT:
PrintShort(stdout, sshortfmt, dp);
break;
case TIFF_LONG:
PrintLong(stdout, longfmt, dp);
break;
case TIFF_SLONG:
PrintLong(stdout, slongfmt, dp);
break;
}
} else {
unsigned char *data = (unsigned char *)_TIFFmalloc(space);
if (data) {
if (TIFFFetchData(fd, dp, data))
if (dp->tdir_count > maxitems) {
PrintData(stdout, dp->tdir_type,
maxitems, data);
printf(" ...");
} else
PrintData(stdout, dp->tdir_type,
dp->tdir_count, data);
_TIFFfree(data);
} else
Error("No space for data for tag %u",
dp->tdir_tag);
}
printf(">\n");
}
done:
if (dir)
_TIFFfree((char *)dir);
return (nextdiroff);
}
