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Do not use internals of ByteIOContext during APE tags parsing.

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Patch by Matti Hamalainen, mail = reverse("if.kmao.stneduts@ialamahm")
Thread: [PATCH] 2/6 Fix broken APE tag key handling

Originally committed as revision 19628 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Matti Hamalainen 2009-08-11 16:55:49 +00:00 committed by Kostya Shishkov
parent 22667e40be
commit 6984380c61
1 changed files with 18 additions and 12 deletions
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30
libavformat/ape.c
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@ -91,22 +91,27 @@ typedef struct {
uint32_t *seektable;
} APEContext;
static void ape_tag_read_field(AVFormatContext *s)
static int ape_tag_read_field(AVFormatContext *s)
{
ByteIOContext *pb = s->pb;
uint8_t key[1024], value[1024];
uint32_t size;
int i, l;
uint32_t size, flags;
int i, l, c;
size = get_le32(pb); /* field size */
url_fskip(pb, 4); /* skip field flags */
for (i=0; pb->buf_ptr[i]!='0' && pb->buf_ptr[i]>=0x20 && pb->buf_ptr[i]<=0x7E; i++);
l = FFMIN(i, sizeof(key) -1);
get_buffer(pb, key, l);
key[l] = 0;
url_fskip(pb, 1 + i-l);
flags = get_le32(pb); /* field flags */
for (i = 0; i < sizeof(key) - 1; i++) {
c = get_byte(pb);
if (c < 0x20 || c > 0x7E)
break;
else
key[i] = c;
}
key[i] = 0;
if (c != 0) {
av_log(s, AV_LOG_WARNING, "Invalid APE tag key '%s'.\n", key);
return -1;
}
l = FFMIN(size, sizeof(value)-1);
get_buffer(pb, value, l);
value[l] = 0;
@ -114,6 +119,7 @@ static void ape_tag_read_field(AVFormatContext *s)
if (l < size)
av_log(s, AV_LOG_WARNING, "Too long '%s' tag was truncated.\n", key);
av_metadata_set(&s->metadata, key, value);
return 0;
}
static void ape_parse_tag(AVFormatContext *s)
@ -161,7 +167,7 @@ static void ape_parse_tag(AVFormatContext *s)
url_fseek(pb, file_size - tag_bytes, SEEK_SET);
for (i=0; i<fields; i++)
ape_tag_read_field(s);
if (ape_tag_read_field(s) < 0) break;
#if ENABLE_DEBUG
av_log(s, AV_LOG_DEBUG, "\nAPE Tags:\n\n");