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authorPřemysl Eric Janouch <p@janouch.name>2021-12-04 07:17:19 +0100
committerPřemysl Eric Janouch <p@janouch.name>2021-12-04 09:34:14 +0100
commit7cb2879c039372965a1a8bccaa5ee74fc448b38c (patch)
tree6da028334f7c9df8ea95de6aa22cb84a5926d60c
parent68009c1d3ea354e75e875246d82eaf72ed65d6d1 (diff)
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jpeginfo: trivially decode Multi-Picture Format
-rw-r--r--tools/jpeginfo.c101
1 files changed, 93 insertions, 8 deletions
diff --git a/tools/jpeginfo.c b/tools/jpeginfo.c
index 67e3703..aa9c46f 100644
--- a/tools/jpeginfo.c
+++ b/tools/jpeginfo.c
@@ -539,6 +539,10 @@ static uint16_t tiff_subifd_tags[] = {
// 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.
+//
+// TODO(p): Exif 2.3 4.6.5 and on.
+// TODO(p): Exif 2.3 4.6.6 and on (note it starts at 0).
+// TODO(p): Exif 2.3 4.6.7 and on (note it starts at 1, and collides with GPS).
// --- Analysis ----------------------------------------------------------------
@@ -677,7 +681,7 @@ static jv
parse_exif_ifd(struct tiffer *T)
{
jv ifd = jv_object();
- struct tiffer_entry entry;
+ struct tiffer_entry entry = {};
while (tiffer_next_entry(T, &entry))
ifd = parse_exif_entry(ifd, T, &entry);
return ifd;
@@ -686,11 +690,11 @@ parse_exif_ifd(struct tiffer *T)
static jv
parse_exif(jv o, const uint8_t *p, size_t len)
{
- struct tiffer T;
+ struct tiffer T = {};
if (!tiffer_init(&T, p, len))
return add_warning(o, "invalid Exif");
while (tiffer_next_ifd(&T))
- o = add_to_subarray(o, "TIFF", parse_exif_ifd(&T));
+ o = add_to_subarray(o, "Exif", parse_exif_ifd(&T));
return o;
}
@@ -982,9 +986,82 @@ struct data {
uint8_t *exif, *icc, *psir;
size_t exif_len, icc_len, psir_len;
int icc_sequence, icc_done;
+ const uint8_t **mpf_offsets, **mpf_next;
+};
+
+enum {
+ MPFVersion = 45056,
+ NumberOfImages = 45057,
+ MPEntry = 45058,
+ ImageUIDList = 45059,
+ TotalFrames = 45060,
};
static void
+parse_mpf_entries(
+ struct data *data, struct tiffer *T, const struct tiffer_entry *entry)
+{
+ // 5.2.3.3. MP Entry
+ if (entry->tag != MPEntry || entry->type != UNDEFINED ||
+ entry->remaining_count % 16)
+ return;
+
+ uint32_t count = entry->remaining_count / 16;
+ 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 offset = T->un->u32(p + 8);
+ // uint16_t dependent1 = T->un->u16(p + 12);
+ // uint16_t dependent2 = T->un->u16(p + 14);
+
+ if (offset)
+ *out++ = T->begin + offset;
+ }
+}
+
+static jv
+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);
+ }
+ return ifd;
+}
+
+static jv
+parse_mpf_attribute_ifd(struct tiffer *T)
+{
+ // TODO(p): Parse the special tags instead.
+ return parse_exif_ifd(T);
+}
+
+static jv
+parse_mpf(jv o, struct data *data, const uint8_t *p, size_t len)
+{
+ struct tiffer T;
+ if (!tiffer_init(&T, p, len) || !tiffer_next_ifd(&T))
+ return add_warning(o, "invalid MPF segment");
+
+ // First image: IFD0 is Index IFD, any IFD1 is Attribute IFD.
+ // Other images: IFD0 is Attribute IFD, there is no Index IFD.
+ if (!data->mpf_offsets) {
+ o = add_to_subarray(o, "MPF", parse_mpf_index_ifd(data, &T));
+ if (!tiffer_next_ifd(&T))
+ return o;
+ }
+ return add_to_subarray(o, "MPF", parse_mpf_attribute_ifd(&T));
+}
+
+static void
parse_append(uint8_t **buffer, size_t *buffer_len, const uint8_t *p, size_t len)
{
size_t buffer_longer = *buffer_len + len;
@@ -999,8 +1076,13 @@ parse_marker(uint8_t marker, const uint8_t *p, const uint8_t *end,
{
// Suspected: MJPEG? Undetected format recursion, e.g., thumbnails?
// Found: Random metadata! Multi-Picture Format!
- if ((data->ended = marker == EOI) && p != end)
- *o = add_warning(*o, "trailing data");
+ if ((data->ended = marker == EOI)) {
+ // TODO(p): Handle Exifs independently--flush the last one.
+ if (data->mpf_offsets && *data->mpf_next)
+ return *data->mpf_next++;
+ if (p != end)
+ *o = add_warning(*o, "trailing data");
+ }
// These markers stand alone, not starting a marker segment.
switch (marker) {
@@ -1098,12 +1180,14 @@ parse_marker(uint8_t marker, const uint8_t *p, const uint8_t *end,
unprintable ? jv_null() : jv_string((const char *) payload));
}
- // CIPA DC-007 (Multi-Picture Format)
+ // CIPA DC-007 (Multi-Picture Format) 5.2
// http://fileformats.archiveteam.org/wiki/Multi-Picture_Format
- // TODO(p): Handle by properly skipping trailing data (use MPF offsets).
+ if (marker == APP2 && p - payload >= 8 && !memcmp(payload, "MPF\0", 4)) {
+ payload += 4;
+ *o = parse_mpf(*o, data, payload, p - payload);
+ }
// CIPA DC-006 (Stereo Still Image Format for Digital Cameras)
- // http://fileformats.archiveteam.org/wiki/Multi-Picture_Format
// TODO(p): Handle by properly skipping trailing data (use Stim offsets).
// https://www.w3.org/Graphics/JPEG/jfif3.pdf
@@ -1218,6 +1302,7 @@ parse_jpeg(jv o, const uint8_t *p, size_t len)
free(data.psir);
}
+ free(data.mpf_offsets);
return jv_set(o, jv_string("markers"), markers);
}