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authorPřemysl Eric Janouch <p@janouch.name>2021-12-03 14:56:55 +0100
committerPřemysl Eric Janouch <p@janouch.name>2021-12-03 14:57:55 +0100
commit06779c6bdda8274f1f67e82b95c5504653690623 (patch)
tree17901abed8ee87e40b51c848425a01f7d3e688bf /tools
parent46c46ac0933f948d6e78a4da21fe42a7c015522a (diff)
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jpeginfo: decode basic TIFF tag names
Diffstat (limited to 'tools')
-rw-r--r--tools/jpeginfo.c129
1 files changed, 127 insertions, 2 deletions
diff --git a/tools/jpeginfo.c b/tools/jpeginfo.c
index 0a5f2ae..4545746 100644
--- a/tools/jpeginfo.c
+++ b/tools/jpeginfo.c
@@ -324,6 +324,120 @@ tiffer_next_entry(struct tiffer *self, struct tiffer_entry *entry)
return true;
}
+// --- TIFF/Exif/MPF/* tags ----------------------------------------------------
+
+struct tiff_entry {
+ const char *name;
+ uint16_t tag;
+};
+
+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},
+ {}
+};
+
+// TODO(p): Insert tags and values from other documentation,
+// so far only Appendix A from TIFF 6.0 is present.
+// There are still quite a few missing constant names from there.
+
// --- Analysis ----------------------------------------------------------------
static jv
@@ -351,6 +465,17 @@ 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)
+{
+ 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));
+ }
+ return add_to_subarray(o, "TIFF", jv_number(entry->tag));
+}
+
static jv
parse_exif(jv o, const uint8_t *p, size_t len)
{
@@ -358,11 +483,11 @@ 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): Decode more and better.
+ // 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 = add_to_subarray(o, "TIFF", jv_number(entry.tag));
+ o = process_exif_entry(o, &entry);
}
}
return o;