jpeginfo: decode basic TIFF tag names
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A0420B94F92B9493
129
tools/jpeginfo.c
129
tools/jpeginfo.c
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@ -324,6 +324,120 @@ tiffer_next_entry(struct tiffer *self, struct tiffer_entry *entry)
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return true;
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}
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// --- TIFF/Exif/MPF/* tags ----------------------------------------------------
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struct tiff_entry {
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const char *name;
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uint16_t tag;
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};
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static struct tiff_entry tiff_entries[] = {
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{"NewSubfileType", 254},
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{"SubfileType", 255},
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{"ImageWidth", 256},
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{"ImageLength", 257},
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{"BitsPerSample", 258},
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{"Compression", 259},
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{"PhotometricInterpretation", 262},
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{"Threshholding", 263},
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{"CellWidth", 264},
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{"CellLength", 265},
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{"FillOrder", 266},
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{"DocumentName", 269},
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{"ImageDescription", 270},
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{"Make", 271},
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{"Model", 272},
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{"StripOffsets", 273},
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{"Orientation", 274},
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{"SamplesPerPixel", 277},
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{"RowsPerStrip", 278},
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{"StripByteCounts", 279},
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{"MinSampleValue", 280},
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{"MaxSampleValue", 281},
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{"XResolution", 282},
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{"YResolution", 283},
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{"PlanarConfiguration", 284},
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{"PageName", 285},
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{"XPosition", 286},
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{"YPosition", 287},
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{"FreeOffsets", 288},
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{"FreeByteCounts", 289},
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{"GrayResponseUnit", 290},
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{"GrayResponseCurve", 291},
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{"T4Options", 292},
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{"T6Options", 293},
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{"ResolutionUnit", 296},
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{"PageNumber", 297},
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{"TransferFunction", 301},
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{"Software", 305},
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{"DateTime", 306},
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{"Artist", 315},
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{"HostComputer", 316},
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{"Predictor", 317},
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{"WhitePoint", 318},
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{"PrimaryChromaticities", 319},
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{"ColorMap", 320},
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{"HalftoneHints", 321},
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{"TileWidth", 322},
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{"TileLength", 323},
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{"TileOffsets", 324},
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{"TileByteCounts", 325},
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{"InkSet", 332},
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{"InkNames", 333},
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{"NumberOfInks", 334},
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{"DotRange", 336},
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{"TargetPrinter", 337},
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{"ExtraSamples", 338},
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{"SampleFormat", 339},
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{"SMinSampleValue", 340},
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{"SMaxSampleValue", 341},
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{"TransferRange", 342},
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{"JPEGProc", 512},
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{"JPEGInterchangeFormat", 513},
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{"JPEGInterchangeFormatLngth", 514},
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{"JPEGRestartInterval", 515},
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{"JPEGLosslessPredictors", 517},
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{"JPEGPointTransforms", 518},
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{"JPEGQTables", 519},
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{"JPEGDCTables", 520},
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{"JPEGACTables", 521},
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{"YCbCrCoefficients", 529},
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{"YCbCrSubSampling", 530},
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{"YCbCrPositioning", 531},
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{"ReferenceBlackWhite", 532},
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{"Copyright", 33432},
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{}
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};
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// Compression
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static struct tiff_entry tiff_compression_values[] = {
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{"Uncompressed", 1},
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{"CCITT 1D", 2},
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{"Group 3 Fax", 3},
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{"Group 4 Fax", 4},
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{"LZW", 5},
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{"JPEG", 6},
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{"PackBits", 32773},
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{}
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};
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// PhotometricInterpretation
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static struct tiff_entry tiff_photometric_interpretation_values[] = {
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{"WhiteIsZero", 0},
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{"BlackIsZero", 1},
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{"RGB", 2},
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{"RGB Palette", 3},
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{"Transparency mask", 4},
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{"CMYK", 5},
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{"YCbCr", 6},
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{"CIELab", 8},
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{}
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};
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// TODO(p): Insert tags and values from other documentation,
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// so far only Appendix A from TIFF 6.0 is present.
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// There are still quite a few missing constant names from there.
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// --- Analysis ----------------------------------------------------------------
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static jv
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@ -351,6 +465,17 @@ add_error(jv o, const char *message)
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// --- Exif --------------------------------------------------------------------
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// TODO(p): Decode more and better.
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static jv
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process_exif_entry(jv o, const struct tiffer_entry *entry)
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{
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for (const struct tiff_entry *p = tiff_entries; p->name; p++) {
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if (p->tag == entry->tag)
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return add_to_subarray(o, "TIFF", jv_string(p->name));
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}
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return add_to_subarray(o, "TIFF", jv_number(entry->tag));
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}
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static jv
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parse_exif(jv o, const uint8_t *p, size_t len)
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{
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@ -358,11 +483,11 @@ parse_exif(jv o, const uint8_t *p, size_t len)
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if (!tiffer_init(&T, p, len))
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return add_warning(o, "invalid Exif");
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// TODO(p): Decode more and better.
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// TODO(p): Turn this into an array of objects indexed by tag name.
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struct tiffer_entry entry;
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while (tiffer_next_ifd(&T)) {
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while (tiffer_next_entry(&T, &entry)) {
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o = add_to_subarray(o, "TIFF", jv_number(entry.tag));
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o = process_exif_entry(o, &entry);
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}
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}
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return o;
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