From 15f57a079ea23551e616e0c38a3d3f2ebc3419b4 Mon Sep 17 00:00:00 2001 From: Přemysl Eric Janouch Date: Fri, 3 Dec 2021 15:52:22 +0100 Subject: jpeginfo: decode some TIFF/Exif values --- tools/jpeginfo.c | 239 ++++++++++++++++++++++++++++++------------------------- 1 file changed, 130 insertions(+), 109 deletions(-) diff --git a/tools/jpeginfo.c b/tools/jpeginfo.c index 4545746..05d4568 100644 --- a/tools/jpeginfo.c +++ b/tools/jpeginfo.c @@ -309,7 +309,7 @@ tiffer_next_entry(struct tiffer *self, struct tiffer_entry *entry) entry->p = self->p; self->p += sizeof offset; } else if (tiffer_u32(self, &offset)) { - entry->p = self->p + offset; + entry->p = self->begin + offset; } else { return false; } @@ -326,111 +326,111 @@ tiffer_next_entry(struct tiffer *self, struct tiffer_entry *entry) // --- TIFF/Exif/MPF/* tags ---------------------------------------------------- +struct tiff_value { + const char *name; + uint16_t value; +}; + struct tiff_entry { const char *name; uint16_t tag; + struct tiff_value *values; }; static struct tiff_entry tiff_entries[] = { - {"NewSubfileType", 254}, - {"SubfileType", 255}, - {"ImageWidth", 256}, - {"ImageLength", 257}, - {"BitsPerSample", 258}, - {"Compression", 259}, - {"PhotometricInterpretation", 262}, - {"Threshholding", 263}, - {"CellWidth", 264}, - {"CellLength", 265}, - {"FillOrder", 266}, - {"DocumentName", 269}, - {"ImageDescription", 270}, - {"Make", 271}, - {"Model", 272}, - {"StripOffsets", 273}, - {"Orientation", 274}, - {"SamplesPerPixel", 277}, - {"RowsPerStrip", 278}, - {"StripByteCounts", 279}, - {"MinSampleValue", 280}, - {"MaxSampleValue", 281}, - {"XResolution", 282}, - {"YResolution", 283}, - {"PlanarConfiguration", 284}, - {"PageName", 285}, - {"XPosition", 286}, - {"YPosition", 287}, - {"FreeOffsets", 288}, - {"FreeByteCounts", 289}, - {"GrayResponseUnit", 290}, - {"GrayResponseCurve", 291}, - {"T4Options", 292}, - {"T6Options", 293}, - {"ResolutionUnit", 296}, - {"PageNumber", 297}, - {"TransferFunction", 301}, - {"Software", 305}, - {"DateTime", 306}, - {"Artist", 315}, - {"HostComputer", 316}, - {"Predictor", 317}, - {"WhitePoint", 318}, - {"PrimaryChromaticities", 319}, - {"ColorMap", 320}, - {"HalftoneHints", 321}, - {"TileWidth", 322}, - {"TileLength", 323}, - {"TileOffsets", 324}, - {"TileByteCounts", 325}, - {"InkSet", 332}, - {"InkNames", 333}, - {"NumberOfInks", 334}, - {"DotRange", 336}, - {"TargetPrinter", 337}, - {"ExtraSamples", 338}, - {"SampleFormat", 339}, - {"SMinSampleValue", 340}, - {"SMaxSampleValue", 341}, - {"TransferRange", 342}, - {"JPEGProc", 512}, - {"JPEGInterchangeFormat", 513}, - {"JPEGInterchangeFormatLngth", 514}, - {"JPEGRestartInterval", 515}, - {"JPEGLosslessPredictors", 517}, - {"JPEGPointTransforms", 518}, - {"JPEGQTables", 519}, - {"JPEGDCTables", 520}, - {"JPEGACTables", 521}, - {"YCbCrCoefficients", 529}, - {"YCbCrSubSampling", 530}, - {"YCbCrPositioning", 531}, - {"ReferenceBlackWhite", 532}, - {"Copyright", 33432}, - {} -}; - -// Compression -static struct tiff_entry tiff_compression_values[] = { - {"Uncompressed", 1}, - {"CCITT 1D", 2}, - {"Group 3 Fax", 3}, - {"Group 4 Fax", 4}, - {"LZW", 5}, - {"JPEG", 6}, - {"PackBits", 32773}, - {} -}; - -// PhotometricInterpretation -static struct tiff_entry tiff_photometric_interpretation_values[] = { - {"WhiteIsZero", 0}, - {"BlackIsZero", 1}, - {"RGB", 2}, - {"RGB Palette", 3}, - {"Transparency mask", 4}, - {"CMYK", 5}, - {"YCbCr", 6}, - {"CIELab", 8}, + {"NewSubfileType", 254, NULL}, + {"SubfileType", 255, NULL}, + {"ImageWidth", 256, NULL}, + {"ImageLength", 257, NULL}, + {"BitsPerSample", 258, NULL}, + {"Compression", 259, (struct tiff_value[]) { + {"Uncompressed", 1}, + {"CCITT 1D", 2}, + {"Group 3 Fax", 3}, + {"Group 4 Fax", 4}, + {"LZW", 5}, + {"JPEG", 6}, + {"PackBits", 32773}, + {} + }}, + {"PhotometricInterpretation", 262, (struct tiff_value[]) { + {"WhiteIsZero", 0}, + {"BlackIsZero", 1}, + {"RGB", 2}, + {"RGB Palette", 3}, + {"Transparency mask", 4}, + {"CMYK", 5}, + {"YCbCr", 6}, + {"CIELab", 8}, + {} + }}, + {"Threshholding", 263, NULL}, + {"CellWidth", 264, NULL}, + {"CellLength", 265, NULL}, + {"FillOrder", 266, NULL}, + {"DocumentName", 269, NULL}, + {"ImageDescription", 270, NULL}, + {"Make", 271, NULL}, + {"Model", 272, NULL}, + {"StripOffsets", 273, NULL}, + {"Orientation", 274, NULL}, + {"SamplesPerPixel", 277, NULL}, + {"RowsPerStrip", 278, NULL}, + {"StripByteCounts", 279, NULL}, + {"MinSampleValue", 280, NULL}, + {"MaxSampleValue", 281, NULL}, + {"XResolution", 282, NULL}, + {"YResolution", 283, NULL}, + {"PlanarConfiguration", 284, NULL}, + {"PageName", 285, NULL}, + {"XPosition", 286, NULL}, + {"YPosition", 287, NULL}, + {"FreeOffsets", 288, NULL}, + {"FreeByteCounts", 289, NULL}, + {"GrayResponseUnit", 290, NULL}, + {"GrayResponseCurve", 291, NULL}, + {"T4Options", 292, NULL}, + {"T6Options", 293, NULL}, + {"ResolutionUnit", 296, NULL}, + {"PageNumber", 297, NULL}, + {"TransferFunction", 301, NULL}, + {"Software", 305, NULL}, + {"DateTime", 306, NULL}, + {"Artist", 315, NULL}, + {"HostComputer", 316, NULL}, + {"Predictor", 317, NULL}, + {"WhitePoint", 318, NULL}, + {"PrimaryChromaticities", 319, NULL}, + {"ColorMap", 320, NULL}, + {"HalftoneHints", 321, NULL}, + {"TileWidth", 322, NULL}, + {"TileLength", 323, NULL}, + {"TileOffsets", 324, NULL}, + {"TileByteCounts", 325, NULL}, + {"InkSet", 332, NULL}, + {"InkNames", 333, NULL}, + {"NumberOfInks", 334, NULL}, + {"DotRange", 336, NULL}, + {"TargetPrinter", 337, NULL}, + {"ExtraSamples", 338, NULL}, + {"SampleFormat", 339, NULL}, + {"SMinSampleValue", 340, NULL}, + {"SMaxSampleValue", 341, NULL}, + {"TransferRange", 342, NULL}, + {"JPEGProc", 512, NULL}, + {"JPEGInterchangeFormat", 513, NULL}, + {"JPEGInterchangeFormatLngth", 514, NULL}, + {"JPEGRestartInterval", 515, NULL}, + {"JPEGLosslessPredictors", 517, NULL}, + {"JPEGPointTransforms", 518, NULL}, + {"JPEGQTables", 519, NULL}, + {"JPEGDCTables", 520, NULL}, + {"JPEGACTables", 521, NULL}, + {"YCbCrCoefficients", 529, NULL}, + {"YCbCrSubSampling", 530, NULL}, + {"YCbCrPositioning", 531, NULL}, + {"ReferenceBlackWhite", 532, NULL}, + {"Copyright", 33432, NULL}, {} }; @@ -465,15 +465,36 @@ add_error(jv o, const char *message) // --- Exif -------------------------------------------------------------------- -// TODO(p): Decode more and better. static jv -process_exif_entry(jv o, const struct tiffer_entry *entry) +process_exif_entry(jv o, struct tiffer *T, const struct tiffer_entry *entry) { + jv value = jv_true(); + + // TODO(p): Decode much more, and also descend into sub-IFD trees. + bool numeric = false; + double real = 0; + if (!entry->remaining_count) { + value = jv_null(); + } else if (entry->type == ASCII) { + value = jv_string_sized((const char *) entry->p, + entry->remaining_count - 1); + } else if ((numeric = tiffer_real(T, entry, &real))) { + value = jv_number(real); + } + for (const struct tiff_entry *p = tiff_entries; p->name; p++) { - if (p->tag == entry->tag) - return add_to_subarray(o, "TIFF", jv_string(p->name)); + if (p->tag != entry->tag) + continue; + + if (numeric && p->values) { + for (const struct tiff_value *q = p->values; q->name; q++) { + if (q->value == real) + return jv_set(o, jv_string(p->name), jv_string(q->name)); + } + } + return jv_set(o, jv_string(p->name), value); } - return add_to_subarray(o, "TIFF", jv_number(entry->tag)); + return jv_set(o, jv_string_fmt("%u", entry->tag), value); } static jv @@ -483,12 +504,12 @@ parse_exif(jv o, const uint8_t *p, size_t len) if (!tiffer_init(&T, p, len)) return add_warning(o, "invalid Exif"); - // TODO(p): Turn this into an array of objects indexed by tag name. struct tiffer_entry entry; while (tiffer_next_ifd(&T)) { - while (tiffer_next_entry(&T, &entry)) { - o = process_exif_entry(o, &entry); - } + jv ifd = jv_object(); + while (tiffer_next_entry(&T, &entry)) + ifd = process_exif_entry(ifd, &T, &entry); + o = add_to_subarray(o, "TIFF", ifd); } return o; } -- cgit v1.2.3-70-g09d2