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info: optionally recurse into certain MakerNotes

This commit is contained in:
Přemysl Eric Janouch 2024-01-23 19:11:39 +01:00
parent f196b03e97
commit 51ca3f8e2e
Signed by: p
GPG Key ID: A0420B94F92B9493
1 changed files with 35 additions and 0 deletions
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35
tools/info.h
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@ -123,6 +123,39 @@ parse_exif_subifds(const struct tiffer *T, struct tiffer_entry *entry,
return a;
}
// Implemented partially, out of curiosity--it is not particularly useful,
// because there is a ton more parsing to do here.
static bool
parse_exif_makernote(jv *v, const struct tiffer_entry *entry)
{
if (!getenv("INFO_MAKERNOTE") ||
entry->tag != Exif_MakerNote || entry->type != TIFFER_UNDEFINED)
return false;
struct tiffer T = {};
if (entry->remaining_count >= 16 &&
!memcmp(entry->p, "Nikon\x00\x02", 7) &&
tiffer_init(&T, entry->p + 10, entry->remaining_count - 10) &&
tiffer_next_ifd(&T)) {
*v = parse_exif_ifd(&T, NULL);
return true;
}
if (entry->remaining_count >= 16 &&
!memcmp(entry->p, "Apple iOS\x00\x00\x01MM", 14)) {
T.un = &tiffer_unbe;
T.begin = T.p = entry->p + 14;
T.end = entry->p + entry->remaining_count - 14;
T.remaining_fields = 0;
struct tiffer subT = {};
if (tiffer_subifd(&T, 0, &subT)) {
*v = parse_exif_ifd(&subT, NULL);
return true;
}
}
return false;
}
static jv
parse_exif_ascii(struct tiffer_entry *entry)
{
@ -198,6 +231,8 @@ parse_exif_entry(jv o, const struct tiffer *T, struct tiffer_entry *entry,
v = parse_exif_subifds(T, entry, subentries);
} else if (entry->type == TIFFER_ASCII) {
v = parse_exif_extract_sole_array_element(parse_exif_ascii(entry));
} else if (info_begin == exif_entries && parse_exif_makernote(&v, entry)) {
// Already processed.
} else if (entry->type == TIFFER_UNDEFINED && !info->values) {
// Several Exif entries of UNDEFINED type contain single-byte numbers.
v = parse_exif_undefined(entry);