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avcodec/exif: remove GetByteContext usage from avpriv_exif_decode_ifd()

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This prevents potential ABI issues with GetByteContext.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer
2017-10-23 23:39:54 -03:00
parent 6bd665b7c5
commit ae100046ca
5 changed files with 22 additions and 9 deletions
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16
libavcodec/exif.c
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@@ -92,7 +92,7 @@ static int exif_decode_tag(void *logctx, GetByteContext *gbytes, int le,
// store metadata or proceed with next IFD // store metadata or proceed with next IFD
ret = ff_tis_ifd(id); ret = ff_tis_ifd(id);
if (ret) { if (ret) {
ret = avpriv_exif_decode_ifd(logctx, gbytes, le, depth + 1, metadata); ret = ff_exif_decode_ifd(logctx, gbytes, le, depth + 1, metadata);
} else { } else {
const char *name = exif_get_tag_name(id); const char *name = exif_get_tag_name(id);
char *use_name = (char*) name; char *use_name = (char*) name;
@@ -119,8 +119,8 @@ static int exif_decode_tag(void *logctx, GetByteContext *gbytes, int le,
} }
int avpriv_exif_decode_ifd(void *logctx, GetByteContext *gbytes, int le, int ff_exif_decode_ifd(void *logctx, GetByteContext *gbytes,
int depth, AVDictionary **metadata) int le, int depth, AVDictionary **metadata)
{ {
int i, ret; int i, ret;
int entries; int entries;
@@ -140,3 +140,13 @@ int avpriv_exif_decode_ifd(void *logctx, GetByteContext *gbytes, int le,
// return next IDF offset or 0x000000000 or a value < 0 for failure // return next IDF offset or 0x000000000 or a value < 0 for failure
return ff_tget_long(gbytes, le); return ff_tget_long(gbytes, le);
} }
int avpriv_exif_decode_ifd(void *logctx, const uint8_t *buf, int size,
int le, int depth, AVDictionary **metadata)
{
GetByteContext gb;
bytestream2_init(&gb, buf, size);
return ff_exif_decode_ifd(logctx, &gb, le, depth, metadata);
}

5
libavcodec/exif.h
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@@ -164,7 +164,10 @@ static const struct exif_tag tag_list[] = { // JEITA CP-3451 EXIF specification:
/** Recursively decodes all IFD's and /** Recursively decodes all IFD's and
* adds included TAGS into the metadata dictionary. */ * adds included TAGS into the metadata dictionary. */
int avpriv_exif_decode_ifd(void *logctx, GetByteContext *gbytes, int le, int avpriv_exif_decode_ifd(void *logctx, const uint8_t *buf, int size,
int le, int depth, AVDictionary **metadata);
int ff_exif_decode_ifd(void *logctx, GetByteContext *gbytes, int le,
int depth, AVDictionary **metadata); int depth, AVDictionary **metadata);
#endif /* AVCODEC_EXIF_H */ #endif /* AVCODEC_EXIF_H */

2
libavcodec/mjpegdec.c
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@@ -1867,7 +1867,7 @@ static int mjpeg_decode_app(MJpegDecodeContext *s)
// read 0th IFD and store the metadata // read 0th IFD and store the metadata
// (return values > 0 indicate the presence of subimage metadata) // (return values > 0 indicate the presence of subimage metadata)
ret = avpriv_exif_decode_ifd(s->avctx, &gbytes, le, 0, &s->exif_metadata); ret = ff_exif_decode_ifd(s->avctx, &gbytes, le, 0, &s->exif_metadata);
if (ret < 0) { if (ret < 0) {
av_log(s->avctx, AV_LOG_ERROR, "mjpeg: error decoding EXIF data\n"); av_log(s->avctx, AV_LOG_ERROR, "mjpeg: error decoding EXIF data\n");
} }

2
libavcodec/webp.c
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@@ -1504,7 +1504,7 @@ static int webp_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
} }
bytestream2_seek(&exif_gb, ifd_offset, SEEK_SET); bytestream2_seek(&exif_gb, ifd_offset, SEEK_SET);
if (avpriv_exif_decode_ifd(avctx, &exif_gb, le, 0, &exif_metadata) < 0) { if (ff_exif_decode_ifd(avctx, &exif_gb, le, 0, &exif_metadata) < 0) {
av_log(avctx, AV_LOG_ERROR, "error decoding Exif data\n"); av_log(avctx, AV_LOG_ERROR, "error decoding Exif data\n");
goto exif_end; goto exif_end;
} }

4
libavformat/avidec.c
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@@ -401,10 +401,10 @@ static int avi_extract_stream_metadata(AVFormatContext *s, AVStream *st)
// skip 4 byte padding // skip 4 byte padding
bytestream2_skip(&gb, 4); bytestream2_skip(&gb, 4);
offset = bytestream2_tell(&gb); offset = bytestream2_tell(&gb);
bytestream2_init(&gb, data + offset, data_size - offset);
// decode EXIF tags from IFD, AVI is always little-endian // decode EXIF tags from IFD, AVI is always little-endian
return avpriv_exif_decode_ifd(s, &gb, 1, 0, &st->metadata); return avpriv_exif_decode_ifd(s, data + offset, data_size - offset,
1, 0, &st->metadata);
break; break;
case MKTAG('C', 'A', 'S', 'I'): case MKTAG('C', 'A', 'S', 'I'):
avpriv_request_sample(s, "RIFF stream data tag type CASI (%u)", tag); avpriv_request_sample(s, "RIFF stream data tag type CASI (%u)", tag);