p
/
fiv
1
1
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

jpeginfo: decode more TIFF tags and values

This commit is contained in:
Přemysl Eric Janouch 2021-12-04 06:03:39 +01:00
parent 64d2f902f2
commit 4cbf9239ee
Signed by: p
GPG Key ID: A0420B94F92B9493
2 changed files with 172 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
fastiv-io.c
View File

@ -1247,6 +1247,7 @@ load_libtiff_directory(TIFF *tiff, GError **error)
fail:
TIFFRGBAImageEnd(&image);
// TODO(p): It's possible to implement ClipPath easily with Cairo.
return surface;
}

202
tools/jpeginfo.c
View File

@ -50,12 +50,19 @@ u16le(const uint8_t *p)
}
// --- TIFF --------------------------------------------------------------------
// TIFF Revision 6.0
// https://www.adobe.io/content/dam/udp/en/open/standards/tiff/TIFF6.pdf
//
// TIFF Technical Note 1: TIFF Trees
// https://download.osgeo.org/libtiff/old/TTN1.ps
//
// Adobe PageMaker 6.0 TIFF Technical Notes [includes TTN1]
// https://www.adobe.io/content/dam/udp/en/open/standards/tiff/TIFFPM6.pdf
//
// Exif Version 2.3
// https://www.cipa.jp/std/documents/e/DC-008-2012_E.pdf
//
// libtiff is a mess, and the format is not particularly complicated.
// Also, we'd still want to duplicate its tag tables.
// Exif libraries are senselessly copylefted.
static struct un {
@ -149,7 +156,7 @@ tiffer_subifd(struct tiffer *self, uint32_t offset, struct tiffer *subreader)
enum tiffer_type {
BYTE = 1, ASCII, SHORT, LONG, RATIONAL,
SBYTE, UNDEFINED, SSHORT, SLONG, SRATIONAL, FLOAT, DOUBLE,
IFD // This last type isn't really used much.
IFD // This last type from TIFF Technical Note 1 isn't really used much.
};
static size_t
@ -339,7 +346,12 @@ struct tiff_entry {
static struct tiff_entry tiff_entries[] = {
{"NewSubfileType", 254, NULL},
{"SubfileType", 255, NULL},
{"SubfileType", 255, (struct tiff_value[]) {
{"Full-resolution image data", 1},
{"Reduced-resolution image data", 2},
{"Page of a multi-page image", 3},
{}
}},
{"ImageWidth", 256, NULL},
{"ImageLength", 257, NULL},
{"BitsPerSample", 258, NULL},
@ -362,18 +374,38 @@ static struct tiff_entry tiff_entries[] = {
{"CMYK", 5},
{"YCbCr", 6},
{"CIELab", 8},
{"ICC CIELab", 9}, // Adobe PageMaker 6.0 TIFF Technical Notes
{}
}},
{"Threshholding", 263, (struct tiff_value[]) {
{"No dithering or halftoning", 1},
{"Ordered dither or halftoning", 2},
{"Randomized process", 3},
{}
}},
{"Threshholding", 263, NULL},
{"CellWidth", 264, NULL},
{"CellLength", 265, NULL},
{"FillOrder", 266, NULL},
{"FillOrder", 266, (struct tiff_value[]) {
{"MSB-first", 1},
{"LSB-first", 2},
{}
}},
{"DocumentName", 269, NULL},
{"ImageDescription", 270, NULL},
{"Make", 271, NULL},
{"Model", 272, NULL},
{"StripOffsets", 273, NULL},
{"Orientation", 274, NULL},
{"Orientation", 274, (struct tiff_value[]) {
{"TopLeft", 1},
{"TopRight", 2},
{"BottomRight", 3},
{"BottomLeft", 4},
{"LeftTop", 5},
{"RightTop", 6},
{"RightBottom", 7},
{"LeftBottom", 8},
{}
}},
{"SamplesPerPixel", 277, NULL},
{"RowsPerStrip", 278, NULL},
{"StripByteCounts", 279, NULL},
@ -381,24 +413,44 @@ static struct tiff_entry tiff_entries[] = {
{"MaxSampleValue", 281, NULL},
{"XResolution", 282, NULL},
{"YResolution", 283, NULL},
{"PlanarConfiguration", 284, NULL},
{"PlanarConfiguration", 284, (struct tiff_value[]) {
{"Chunky", 1},
{"Planar", 2},
{}
}},
{"PageName", 285, NULL},
{"XPosition", 286, NULL},
{"YPosition", 287, NULL},
{"FreeOffsets", 288, NULL},
{"FreeByteCounts", 289, NULL},
{"GrayResponseUnit", 290, NULL},
{"GrayResponseUnit", 290, (struct tiff_value[]) {
{"1/10", 1},
{"1/100", 2},
{"1/1000", 3},
{"1/10000", 4},
{"1/100000", 5},
{}
}},
{"GrayResponseCurve", 291, NULL},
{"T4Options", 292, NULL},
{"T6Options", 293, NULL},
{"ResolutionUnit", 296, NULL},
{"ResolutionUnit", 296, (struct tiff_value[]) {
{"None", 1},
{"Inch", 2},
{"Centimeter", 3},
{}
}},
{"PageNumber", 297, NULL},
{"TransferFunction", 301, NULL},
{"Software", 305, NULL},
{"DateTime", 306, NULL},
{"Artist", 315, NULL},
{"HostComputer", 316, NULL},
{"Predictor", 317, NULL},
{"Predictor", 317, (struct tiff_value[]) {
{"None", 1},
{"Horizontal", 2},
{}
}},
{"WhitePoint", 318, NULL},
{"PrimaryChromaticities", 319, NULL},
{"ColorMap", 320, NULL},
@ -407,36 +459,74 @@ static struct tiff_entry tiff_entries[] = {
{"TileLength", 323, NULL},
{"TileOffsets", 324, NULL},
{"TileByteCounts", 325, NULL},
{"InkSet", 332, NULL},
{"SubIFDs", 330, NULL}, // TIFF Technical Note 1: TIFF Trees
{"InkSet", 332, (struct tiff_value[]) {
{"CMYK", 1},
{"Non-CMYK", 2},
{}
}},
{"InkNames", 333, NULL},
{"NumberOfInks", 334, NULL},
{"DotRange", 336, NULL},
{"TargetPrinter", 337, NULL},
{"ExtraSamples", 338, NULL},
{"SampleFormat", 339, NULL},
{"ExtraSamples", 338, (struct tiff_value[]) {
{"Unspecified", 0},
{"Associated alpha", 1},
{"Unassociated alpha", 2},
{}
}},
{"SampleFormat", 339, (struct tiff_value[]) {
{"Unsigned integer", 1},
{"Two's complement signed integer", 2},
{"IEEE floating-point", 3},
{"Undefined", 4},
{}
}},
{"SMinSampleValue", 340, NULL},
{"SMaxSampleValue", 341, NULL},
{"TransferRange", 342, NULL},
{"JPEGProc", 512, NULL},
{"ClipPath", 343, NULL}, // TIFF Technical Note 2: Clipping Path
{"XClipPathUnits", 344, NULL}, // TIFF Technical Note 2: Clipping Path
{"YClipPathUnits", 345, NULL}, // TIFF Technical Note 2: Clipping Path
{"Indexed", 346, NULL}, // TIFF Technical Note 3: Indexed Images
{"OPIProxy", 351, NULL}, // Adobe PageMaker 6.0 TIFF Technical Notes
{"JPEGProc", 512, (struct tiff_value[]) {
{"Baseline sequential", 1},
{"Lossless Huffman", 14},
{}
}},
{"JPEGInterchangeFormat", 513, NULL},
{"JPEGInterchangeFormatLength", 514, NULL},
{"JPEGRestartInterval", 515, NULL},
{"JPEGLosslessPredictors", 517, NULL},
{"JPEGLosslessPredictors", 517, (struct tiff_value[]) {
{"A", 1},
{"B", 2},
{"C", 3},
{"A+B+C", 4},
{"A+((B-C)/2)", 5},
{"B+((A-C)/2)", 6},
{"(A+B)/2", 7},
{}
}},
{"JPEGPointTransforms", 518, NULL},
{"JPEGQTables", 519, NULL},
{"JPEGDCTables", 520, NULL},
{"JPEGACTables", 521, NULL},
{"YCbCrCoefficients", 529, NULL},
{"YCbCrSubSampling", 530, NULL},
{"YCbCrPositioning", 531, NULL},
{"YCbCrPositioning", 531, (struct tiff_value[]) {
{"Centered", 1},
{"Cosited", 2},
{}
}},
{"ReferenceBlackWhite", 532, NULL},
{"ImageID", 32781, NULL}, // Adobe PageMaker 6.0 TIFF Technical Notes
{"Copyright", 33432, NULL},
{}
};
// 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.
// so far only tags and non-bit-field values from TIFF 6.0 and PM6 are present.
// --- Analysis ----------------------------------------------------------------
@ -465,23 +555,69 @@ add_error(jv o, const char *message)
// --- Exif --------------------------------------------------------------------
static jv parse_exif_ifd(struct tiffer *T);
static jv
process_exif_entry(jv o, struct tiffer *T, const struct tiffer_entry *entry)
parse_exif_subifds(struct tiffer *T, const struct tiffer_entry *entry)
{
int64_t offset = 0;
struct tiffer subT = {};
if (!tiffer_integer(T, entry, &offset) ||
offset < 0 || offset > UINT32_MAX || !tiffer_subifd(T, offset, &subT))
return jv_null();
// The chain should correspond to the values in the entry,
// we are not going to verify it.
jv a = jv_array();
do a = jv_array_append(a, parse_exif_ifd(&subT));
while (tiffer_next_ifd(&subT));
return a;
}
static jv
parse_exif_ascii(struct tiffer_entry *entry)
{
// Adobe XMP Specification Part 3: Storage in Files, 2020/1, 2.4.2
// The text may in practice contain any 8-bit encoding, but likely UTF-8.
// TODO(p): Validate UTF-8, and assume Latin 1 if unsuccessful.
jv a = jv_array();
uint8_t *nul = 0;
while ((nul = memchr(entry->p, 0, entry->remaining_count))) {
size_t len = nul - entry->p;
a = jv_array_append(a, jv_string_sized((const char *) entry->p, len));
entry->remaining_count -= len + 1;
entry->p += len + 1;
}
// Trailing NULs are required, but let's extract everything.
if (entry->remaining_count) {
a = jv_array_append(a,
jv_string_sized((const char *) entry->p, entry->remaining_count));
}
// TODO(p): May extract this into a function, and reuse it below.
if (jv_array_length(jv_copy(a)) == 1)
return jv_array_get(a, 0);
return a;
}
static jv
parse_exif_entry(jv o, struct tiffer *T, 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 == IFD) {
value = parse_exif_subifds(T, entry);
} else if (entry->type == ASCII) {
value = jv_string_sized((const char *) entry->p,
entry->remaining_count - 1);
value = parse_exif_ascii(entry);
} else if ((numeric = tiffer_real(T, entry, &real))) {
value = jv_number(real);
}
// TODO(p): Decode UNDEFINED as a hex dump, and iterate over all values.
for (const struct tiff_entry *p = tiff_entries; p->name; p++) {
if (p->tag != entry->tag)
continue;
@ -497,20 +633,24 @@ process_exif_entry(jv o, struct tiffer *T, const struct tiffer_entry *entry)
return jv_set(o, jv_string_fmt("%u", entry->tag), value);
}
static jv
parse_exif_ifd(struct tiffer *T)
{
jv ifd = jv_object();
struct tiffer_entry entry;
while (tiffer_next_entry(T, &entry))
ifd = parse_exif_entry(ifd, T, &entry);
return ifd;
}
static jv
parse_exif(jv o, const uint8_t *p, size_t len)
{
struct tiffer T;
if (!tiffer_init(&T, p, len))
return add_warning(o, "invalid Exif");
struct tiffer_entry entry;
while (tiffer_next_ifd(&T)) {
jv ifd = jv_object();
while (tiffer_next_entry(&T, &entry))
ifd = process_exif_entry(ifd, &T, &entry);
o = add_to_subarray(o, "TIFF", ifd);
}
while (tiffer_next_ifd(&T))
o = add_to_subarray(o, "TIFF", parse_exif_ifd(&T));
return o;
}