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jpeginfo: parse TIFF UNDEFINED values

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This commit is contained in:
Přemysl Eric Janouch 2021-12-04 06:31:24 +01:00
parent 4cbf9239ee
commit 4d9236336c
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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@ -601,6 +601,20 @@ parse_exif_ascii(struct tiffer_entry *entry)
return a; return a;
} }
static jv
parse_exif_undefined(struct tiffer_entry *entry)
{
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];
}
jv s = jv_string(buf);
free(buf);
return s;
}
static jv static jv
parse_exif_entry(jv o, struct tiffer *T, struct tiffer_entry *entry) parse_exif_entry(jv o, struct tiffer *T, struct tiffer_entry *entry)
{ {
@ -613,11 +627,13 @@ parse_exif_entry(jv o, struct tiffer *T, struct tiffer_entry *entry)
value = parse_exif_subifds(T, entry); value = parse_exif_subifds(T, entry);
} else if (entry->type == ASCII) { } else if (entry->type == ASCII) {
value = parse_exif_ascii(entry); value = parse_exif_ascii(entry);
} else if (entry->type == UNDEFINED) {
value = parse_exif_undefined(entry);
} else if ((numeric = tiffer_real(T, entry, &real))) { } else if ((numeric = tiffer_real(T, entry, &real))) {
value = jv_number(real); value = jv_number(real);
} }
// TODO(p): Decode UNDEFINED as a hex dump, and iterate over all values. // TODO(p): Iterate over all numeric values.
for (const struct tiff_entry *p = tiff_entries; p->name; p++) { for (const struct tiff_entry *p = tiff_entries; p->name; p++) {
if (p->tag != entry->tag) if (p->tag != entry->tag)
continue; continue;