jpeginfo: review and update TIFF
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@ -50,16 +50,28 @@ u16le(const uint8_t *p)
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}
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// --- TIFF --------------------------------------------------------------------
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// TIFF Revision 6.0
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// TIFF Revision 6.0 (1992)
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// https://www.adobe.io/content/dam/udp/en/open/standards/tiff/TIFF6.pdf
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//
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// TIFF Technical Note 1: TIFF Trees
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// TIFF Technical Note 1: TIFF Trees (1993)
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// https://download.osgeo.org/libtiff/old/TTN1.ps
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//
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// Adobe PageMaker 6.0 TIFF Technical Notes [includes TTN1]
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// DRAFT TIFF Technical Note 2 (1995)
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// https://www.awaresystems.be/imaging/tiff/specification/TIFFTechNote2.txt
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//
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// Adobe PageMaker 6.0 TIFF Technical Notes (1995) [includes TTN1]
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// https://www.adobe.io/content/dam/udp/en/open/standards/tiff/TIFFPM6.pdf
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//
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// Exif Version 2.3
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// Adobe Photoshop TIFF Technical Notes (2002)
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// https://www.adobe.io/content/dam/udp/en/open/standards/tiff/TIFFphotoshop.pdf
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// - Note that ImageSourceData 8BIM frames are specified differently
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// from how Adobe XMP Specification Part 3 defines them.
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// - The document places a condition on SubIFDs, without further explanation.
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//
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// Adobe Photoshop TIFF Technical Note 3 (2005)
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// http://chriscox.org/TIFFTN3d1.pdf
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//
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// Exif Version 2.3 (2012)
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// https://www.cipa.jp/std/documents/e/DC-008-2012_E.pdf
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//
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// libtiff is a mess, and the format is not particularly complicated.
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@ -120,7 +132,8 @@ tiffer_init(struct tiffer *self, const uint8_t *tiff, size_t len)
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return false;
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self->p = tiff + 4;
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// The first IFD needs to be read by caller explicitly.
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// The first IFD needs to be read by caller explicitly,
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// even though it's required to be present by TIFF 6.0.
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return true;
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}
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@ -140,6 +153,8 @@ tiffer_next_ifd(struct tiffer *self)
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if (!ifd_offset)
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return false;
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// Note that TIFF 6.0 requires there to be at least one entry,
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// but there is no need for us to check it.
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self->p = self->begin + ifd_offset;
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return tiffer_u16(self, &self->remaining_fields);
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}
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@ -213,6 +228,8 @@ tiffer_integer(
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return false;
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// Somewhat excessively lenient, intended for display.
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// TIFF 6.0 only directly suggests that a reader is should accept
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// any of BYTE/SHORT/LONG for unsigned integers.
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switch (entry->type) {
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case BYTE:
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case ASCII:
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@ -274,6 +291,7 @@ tiffer_real(
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return false;
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// Somewhat excessively lenient, intended for display.
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// Assuming the host architecture uses IEEE 754.
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switch (entry->type) {
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int64_t numerator, denominator;
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case FLOAT:
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@ -297,6 +315,7 @@ tiffer_next_entry(struct tiffer *self, struct tiffer_entry *entry)
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if (!self->remaining_fields)
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return false;
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// Note that Multi-Picture Format doesn't require ascending tag order.
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uint16_t type = entry->type = 0xFFFF;
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if (!tiffer_u16(self, &entry->tag) || !tiffer_u16(self, &type) ||
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!tiffer_u32(self, &entry->remaining_count))
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@ -355,7 +374,10 @@ static struct tiff_entry tiff_entries[] = {
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{"Group 4 Fax", 4},
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{"LZW", 5},
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{"JPEG", 6},
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{"JPEG datastream", 7}, // DRAFT TIFF Technical Note 2 + TIFFphotoshop
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{"Deflate/zlib", 8}, // Adobe Photoshop TIFF Technical Notes
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{"PackBits", 32773},
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{"Deflate/zlib", 32946}, // Adobe Photoshop TIFF Technical Notes
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{}
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}},
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{"PhotometricInterpretation", 262, (struct tiff_value[]) {
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@ -367,7 +389,7 @@ static struct tiff_entry tiff_entries[] = {
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{"CMYK", 5},
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{"YCbCr", 6},
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{"CIELab", 8},
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{"ICC CIELab", 9}, // Adobe PageMaker 6.0 TIFF Technical Notes
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{"ICCLab", 9}, // Adobe PageMaker 6.0 TIFF Technical Notes
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{}
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}},
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{"Threshholding", 263, (struct tiff_value[]) {
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@ -442,6 +464,7 @@ static struct tiff_entry tiff_entries[] = {
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{"Predictor", 317, (struct tiff_value[]) {
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{"None", 1},
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{"Horizontal", 2},
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{"Floating point", 3}, // Adobe Photoshop TIFF Technical Note 3
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{}
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}},
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{"WhitePoint", 318, NULL},
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@ -482,6 +505,7 @@ static struct tiff_entry tiff_entries[] = {
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{"XClipPathUnits", 344, NULL}, // TIFF Technical Note 2: Clipping Path
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{"YClipPathUnits", 345, NULL}, // TIFF Technical Note 2: Clipping Path
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{"Indexed", 346, NULL}, // TIFF Technical Note 3: Indexed Images
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{"JPEGTables", 347, NULL}, // DRAFT TIFF Technical Note 2 + TIFFphotoshop
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{"OPIProxy", 351, NULL}, // Adobe PageMaker 6.0 TIFF Technical Notes
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{"JPEGProc", 512, (struct tiff_value[]) {
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{"Baseline sequential", 1},
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@ -517,6 +541,7 @@ static struct tiff_entry tiff_entries[] = {
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{"Copyright", 33432, NULL},
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{"Exif IFD Pointer", 34665, NULL}, // Exif 2.3
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{"GPS Info IFD Pointer", 34853, NULL}, // Exif 2.3
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{"ImageSourceData", 37724, NULL}, // Adobe Photoshop TIFF Technical Notes
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{"Interoperability IFD Pointer", 40965, NULL}, // Exif 2.3
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{}
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};
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@ -609,6 +634,7 @@ parse_exif_ascii(struct tiffer_entry *entry)
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static jv
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parse_exif_undefined(struct tiffer_entry *entry)
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{
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// Sometimes, it can be ASCII, but the safe bet is to hex-encode it.
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const char *alphabet = "0123456789abcdef";
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char *buf = calloc(1, 2 * entry->remaining_count + 1);
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for (uint32_t i = 0; i < entry->remaining_count; i++) {
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