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jpeginfo: descend into Exif IFDs

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This commit is contained in:
Přemysl Eric Janouch 2021-12-04 07:04:13 +01:00
parent 5d659d208c
commit 68009c1d3e
Signed by: p
GPG Key ID: A0420B94F92B9493
1 changed files with 17 additions and 1 deletions
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18
tools/jpeginfo.c
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@ -522,9 +522,21 @@ static struct tiff_entry tiff_entries[] = {
{"ReferenceBlackWhite", 532, NULL},
{"ImageID", 32781, NULL}, // Adobe PageMaker 6.0 TIFF Technical Notes
{"Copyright", 33432, NULL},
{"Exif IFD Pointer", 34665, NULL}, // Exif 2.3
{"GPS Info IFD Pointer", 34853, NULL}, // Exif 2.3
{"Interoperability IFD Pointer", 40965, NULL}, // Exif 2.3
{}
};
// TODO(p): Consider if these can't be inlined into the above table.
static uint16_t tiff_subifd_tags[] = {
330, // SubIFDs
34665, // Exif IFD Pointer
34853, // GPS Info IFD Pointer
40965, // Interoperability IFD Pointer
0
};
// TODO(p): Insert tags and values from other documentation,
// so far only tags and non-bit-field values from TIFF 6.0 and PM6 are present.
@ -635,11 +647,15 @@ parse_exif_entry(jv o, struct tiffer *T, struct tiffer_entry *entry)
if (info->tag == entry->tag)
break;
bool is_subifd = false;
for (const uint16_t *p = tiff_subifd_tags; *p; p++)
is_subifd |= *p == entry->tag;
jv v = jv_true();
double real = 0;
if (!entry->remaining_count) {
v = jv_null();
} else if (entry->type == IFD) {
} else if (entry->type == IFD || is_subifd) {
v = parse_exif_subifds(T, entry);
} else if (entry->type == ASCII) {
v = parse_exif_extract_sole_array_element(parse_exif_ascii(entry));