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jpeginfo: describe Photoshop records

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This commit is contained in:
Přemysl Eric Janouch 2021-12-05 17:50:36 +01:00
parent 4b306b7c93
commit a519a5dec6
Signed by: p
GPG Key ID: A0420B94F92B9493
1 changed files with 221 additions and 12 deletions
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233
tools/jpeginfo.c
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@ -25,6 +25,18 @@
// --- Utilities ---------------------------------------------------------------
static char *
binhex(const uint8_t *data, size_t len)
{
static const char *alphabet = "0123456789abcdef";
char *buf = calloc(1, len * 2 + 1), *p = buf;
for (size_t i = 0; i < len; i++) {
*p++ = alphabet[data[i] >> 4];
*p++ = alphabet[data[i] & 0xF];
}
return buf;
}
static uint32_t
u32be(const uint8_t *p)
{
@ -78,7 +90,8 @@ u16le(const uint8_t *p)
// https://www.cipa.jp/e/std/std-sec.html
//
// libtiff is a mess, and the format is not particularly complicated.
// Exif libraries are senselessly copylefted.
// Exiv2 is senselessly copylefted, and cannot do much.
// ExifTool is too user-oriented.
static struct un {
uint32_t (*u32) (const uint8_t *);
@ -542,8 +555,12 @@ static struct tiff_entry tiff_entries[] = {
{"ReferenceBlackWhite", 532, NULL},
{"ImageID", 32781, NULL}, // Adobe PageMaker 6.0 TIFF Technical Notes
{"Copyright", 33432, NULL},
// TODO(p): Extract PSIRs, like we do directly with the JPEG segment.
{"Photoshop", 34377, NULL}, // Adobe XMP Specification Part 3 Table 12/39
{"Exif IFD Pointer", 34665, NULL}, // Exif 2.3
{"GPS Info IFD Pointer", 34853, NULL}, // Exif 2.3
// TODO(p): Extract IPTC DataSets, like we do directly with PSIRs.
{"IPTC", 37723, NULL}, // Adobe XMP Specification Part 3 Table 12/39
{"ImageSourceData", 37724, NULL}, // Adobe Photoshop TIFF Technical Notes
{}
};
@ -906,12 +923,7 @@ static jv
parse_exif_undefined(struct tiffer_entry *entry)
{
// Sometimes, it can be ASCII, but the safe bet is to hex-encode it.
const char *alphabet = "0123456789abcdef";
char *buf = calloc(1, 2 * entry->remaining_count + 1);
for (uint32_t i = 0; i < entry->remaining_count; i++) {
buf[2 * i + 0] = alphabet[entry->p[i] >> 4];
buf[2 * i + 1] = alphabet[entry->p[i] & 0xF];
}
char *buf = binhex(entry->p, entry->remaining_count);
jv s = jv_string(buf);
free(buf);
return s;
@ -1090,16 +1102,213 @@ parse_icc(jv o, const uint8_t *profile, size_t profile_len)
// --- Photoshop Image Resources -----------------------------------------------
// Adobe XMP Specification Part 3: Storage in Files, 2020/1, 1.1.3 + 3.1.3
// https://www.adobe.com/devnet-apps/photoshop/fileformatashtml/
// Unless otherwise noted, the descriptions are derived from the above document.
static struct {
uint16_t id;
const char *description;
} psir_descriptions[] = {
{1000, "Number of channels, rows, columns, depth, mode"},
{1001, "Macintosh print manager print info record"},
{1002, "Macintosh page format information"},
{1003, "Indexed color table"},
{1005, "Resolution information"},
{1006, "Names of alpha channels (Pascal strings)"},
{1007, "Display information"},
{1008, "Caption (Pascal string)"}, // XMP Part 3 3.3.3
{1009, "Border information"},
{1010, "Background color"},
{1011, "Print flags"},
{1012, "Grayscale and multichannel halftoning information"},
{1013, "Color halftoning information"},
{1014, "Duotone halftoning information"},
{1015, "Grayscale and multichannel transfer function"},
{1016, "Color transfer functions"},
{1017, "Duotone transfer functions"},
{1018, "Duotone image information"},
{1019, "Effective B/W values for the dot range"},
{1020, "Caption"}, // XMP Part 3 3.3.3
{1021, "EPS options"},
{1022, "Quick Mask information"},
{1023, "(Obsolete)"},
{1024, "Layer state information"},
{1025, "Working path (not saved)"},
{1026, "Layers group information"},
{1027, "(Obsolete)"},
{1028, "IPTC DataSets"}, // XMP Part 3 3.3.3
{1029, "Image mode for raw format files"},
{1030, "JPEG quality"},
{1032, "Grid and guides information"},
{1033, "Thumbnail resource"},
{1034, "Copyright flag"},
{1035, "Copyright information URL"}, // XMP Part 3 3.3.3
{1036, "Thumbnail resource"},
{1037, "Global lighting angle for effects layer"},
{1038, "Color samplers information"},
{1039, "ICC profile"},
{1040, "Watermark"},
{1041, "ICC untagged profile flag"},
{1042, "Effects visible flag"},
{1043, "Spot halftone"},
{1044, "Document-specific IDs seed number"},
{1045, "Unicode alpha names"},
{1046, "Indexed color table count"},
{1047, "Transparent color index"},
{1049, "Global altitude"},
{1050, "Slices"},
{1051, "Workflow URL"},
{1052, "Jump To XPEP"},
{1053, "Alpha identifiers"},
{1054, "URL list"},
{1057, "Version info"},
{1058, "Exif metadata 1"},
{1059, "Exif metadata 3"},
{1060, "XMP metadata"},
{1061, "MD5 digest of IPTC data"}, // XMP Part 3 3.3.3
{1062, "Print scale"},
{1064, "Pixel aspect ratio"},
{1065, "Layer comps"},
{1066, "Alternate duotone colors"},
{1067, "Alternate spot colors"},
{1069, "Layer selection IDs"},
{1070, "HDR toning information"},
{1071, "Print info"},
{1072, "Layer group(s) enabled ID"},
{1073, "Color samplers"},
{1074, "Measurement scale"},
{1075, "Timeline information"},
{1076, "Sheet disclosure"},
{1077, "Display information to support floating point colors"},
{1078, "Onion skins"},
{1080, "Count information"},
{1082, "Print information"},
{1083, "Print style"},
{1084, "Macintosh NSPrintInfo"},
{1085, "Windows DEVMODE"},
{1086, "Autosave file path"},
{1087, "Autosave format"},
{1088, "Path selection state"},
// {2000-2997, "Saved paths"},
{2999, "Name of clipping path"},
{3000, "Origin path information"},
// {4000-4999, "Plug-in resource"},
{7000, "Image Ready variables"},
{7001, "Image Ready data sets"},
{7002, "Image Ready default selected state"},
{7003, "Image Ready 7 rollover expanded state"},
{7004, "Image Ready rollover expanded state"},
{7005, "Image Ready save layer settings"},
{7006, "Image Ready version"},
{8000, "Lightroom workflow"},
{10000, "Print flags"},
{}
};
static jv
process_psir_thumbnail(jv res, const uint8_t *data, size_t len)
{
uint32_t format_number = u32be(data + 0);
uint32_t compressed_size = u32be(data + 20);
// TODO(p): Recurse into the thumbnail if it's a JPEG.
jv format = jv_number(format_number);
switch (format_number) {
break; case 0: format = jv_string("kJpegRGB");
break; case 1: format = jv_string("kRawRGB");
}
res = jv_object_merge(res, JV_OBJECT(
jv_string("Format"), format,
jv_string("Width"), jv_number(u32be(data + 4)),
jv_string("Height"), jv_number(u32be(data + 8)),
jv_string("Stride"), jv_number(u32be(data + 12)),
jv_string("TotalSize"), jv_number(u32be(data + 16)),
jv_string("CompressedSize"), jv_number(compressed_size),
jv_string("BitsPerPixel"), jv_number(u16be(data + 24)),
jv_string("Planes"), jv_number(u16be(data + 26))
));
if (28 + compressed_size <= len) {
char *buf = binhex(data + 28, compressed_size);
res = jv_set(res, jv_string("Data"), jv_string(buf));
free(buf);
}
return res;
}
static const char *
process_iptc_dataset(jv *a, const uint8_t **p, size_t len)
{
const uint8_t *header = *p;
if (len < 5)
return "unexpected end of IPTC data";
if (*header != 0x1c)
return "invalid tag marker";
uint8_t record = header[1];
uint8_t dataset = header[2];
uint16_t byte_count = header[3] << 8 | header[4];
// TODO(p): Although highly unlikely to appear, we could decode it.
if (byte_count & 0x8000)
return "unsupported extended DataSet";
if (len - 5 < byte_count)
return "data overrun";
char *buf = binhex(header + 5, byte_count);
*p += 5 + byte_count;
*a = jv_array_append(*a, JV_OBJECT(
jv_string("DataSet"), jv_string_fmt("%u:%u", record, dataset),
jv_string("Data"), jv_string(buf)
));
free(buf);
return NULL;
}
static jv
process_psir_iptc(jv res, const uint8_t *data, size_t len)
{
// https://iptc.org/standards/iim/
// https://iptc.org/std/IIM/4.2/specification/IIMV4.2.pdf
jv a = jv_array();
const uint8_t *end = data + len;
while (data < end) {
const char *err = process_iptc_dataset(&a, &data, end - data);
if (err) {
a = jv_array_append(a, jv_string(err));
break;
}
}
return jv_set(res, jv_string("DataSets"), a);
}
static jv
process_psir(jv o, uint16_t resource_id, const char *name,
const uint8_t *data, size_t len)
{
// TODO(p): These is more to extract here. The name is most often empty.
(void) name;
(void) data;
(void) len;
return add_to_subarray(o, "PSIR", jv_number(resource_id));
const char *description = NULL;
if (resource_id >= 2000 && resource_id <= 2997)
description = "Saved paths";
if (resource_id >= 4000 && resource_id <= 4999)
description = "Plug-in resource";
for (size_t i = 0; psir_descriptions[i].id; i++)
if (psir_descriptions[i].id == resource_id)
description = psir_descriptions[i].description;
jv res = JV_OBJECT(
jv_string("name"), jv_string(name),
jv_string("id"), jv_number(resource_id),
jv_string("description"),
description ? jv_string(description) : jv_null(),
jv_string("size"), jv_number(len)
);
// Both are thumbnails, older is BGR, newer is RGB.
if ((resource_id == 1033 || resource_id == 1036) && len >= 28)
res = process_psir_thumbnail(res, data, len);
if (resource_id == 1028)
res = process_psir_iptc(res, data, len);
return add_to_subarray(o, "PSIR", res);
}
static jv