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jpeginfo: decode MPF MPEntry

This commit is contained in:
Přemysl Eric Janouch 2021-12-05 10:21:10 +01:00
parent bac9cd24fc
commit e2bdda77a3
Signed by: p
GPG Key ID: A0420B94F92B9493
1 changed files with 47 additions and 16 deletions
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63
tools/jpeginfo.c
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@ -990,29 +990,65 @@ enum {
TotalFrames = 45060,
};
static void
parse_mpf_entries(
struct data *data, struct tiffer *T, const struct tiffer_entry *entry)
static jv
parse_mpf_index_entry(
jv o, struct data *data, struct tiffer *T, struct tiffer_entry *entry)
{
// 5.2.3.3. MP Entry
if (entry->tag != MPEntry || entry->type != UNDEFINED ||
entry->remaining_count % 16)
return;
entry->remaining_count % 16) {
// TODO(p): Parse the remaining special tags instead.
return parse_exif_entry(o, T, entry);
}
uint32_t count = entry->remaining_count / 16;
jv a = jv_array_sized(count);
const uint8_t **out = data->mpf_next = data->mpf_offsets =
calloc(sizeof *data->mpf_offsets, count + 1);
for (uint32_t i = 0; i < count; i++) {
const uint8_t *p = entry->p + i * 16;
// uint32_t attribute = T->un->u32(p);
// uint32_t size = T->un->u32(p + 4);
uint32_t attrs = T->un->u32(p);
uint32_t size = T->un->u32(p + 4);
uint32_t offset = T->un->u32(p + 8);
// uint16_t dependent1 = T->un->u16(p + 12);
// uint16_t dependent2 = T->un->u16(p + 14);
uint16_t dependent1 = T->un->u16(p + 12);
uint16_t dependent2 = T->un->u16(p + 14);
uint32_t type_number = attrs & 0xFFFFFF;
jv type = jv_number(type_number);
switch (type_number) {
break; case 0x030000: type = jv_string("Baseline MP Primary Image");
break; case 0x010001: type = jv_string("Large Thumbnail VGA");
break; case 0x010002: type = jv_string("Large Thumbnail Full HD");
break; case 0x020001: type = jv_string("Multi-Frame Image Panorama");
break; case 0x020002: type = jv_string("Multi-Frame Image Disparity");
break; case 0x020003: type = jv_string("Multi-Frame Image Multi-Angle");
break; case 0x000000: type = jv_string("Undefined");
}
uint32_t format_number = (attrs >> 24) & 0x7;
jv format = jv_number(format_number);
if (format_number == 0)
format = jv_string("JPEG");
a = jv_array_append(a, JV_OBJECT(
jv_string("Individual Image Attribute"), JV_OBJECT(
jv_string("Dependent Parent Image"), jv_bool((attrs >> 31) & 1),
jv_string("Dependent Child Image"), jv_bool((attrs >> 30) & 1),
jv_string("Representative Image"), jv_bool((attrs >> 29) & 1),
jv_string("Reserved"), jv_number((attrs >> 27) & 0x3),
jv_string("Image Data Format"), format,
jv_string("MP Type Code"), type
),
jv_string("Individual Image Size"), jv_number(size),
jv_string("Individual Image Data Offset"), jv_number(offset),
jv_string("Dependent Image 1 Entry Number"), jv_number(dependent1),
jv_string("Dependent Image 2 Entry Number"), jv_number(dependent2)
));
if (offset)
*out++ = T->begin + offset;
}
return jv_set(o, jv_string("MPEntry"), a);
}
static jv
@ -1020,13 +1056,8 @@ parse_mpf_index_ifd(struct data *data, struct tiffer *T)
{
jv ifd = jv_object();
struct tiffer_entry entry = {};
while (tiffer_next_entry(T, &entry)) {
struct tiffer_entry copy = entry;
parse_mpf_entries(data, T, &entry);
// TODO(p): Parse the special tags instead.
ifd = parse_exif_entry(ifd, T, &copy);
}
while (tiffer_next_entry(T, &entry))
ifd = parse_mpf_index_entry(ifd, data, T, &entry);
return ifd;
}