[FFmpeg-cvslog] Fixed size given to init_get_bits() in xan decoder.
Laurent Aimar
git at videolan.org
Thu Sep 22 01:17:28 CEST 2011
ffmpeg | branch: release/0.8 | Laurent Aimar <fenrir at videolan.org> | Sat Sep 10 00:32:12 2011 +0200| [bb0c352ec550f19b8ced2675ebd266305ca25a99] | committer: Anton Khirnov
Fixed size given to init_get_bits() in xan decoder.
(cherry picked from commit 393d5031c6aaaf8c2dda4eb5d676974c349fae85)
Signed-off-by: Anton Khirnov <anton at khirnov.net>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=bb0c352ec550f19b8ced2675ebd266305ca25a99
---
libavcodec/xan.c | 10 ++++++----
1 files changed, 6 insertions(+), 4 deletions(-)
diff --git a/libavcodec/xan.c b/libavcodec/xan.c
index 876a9a5..521764f 100644
--- a/libavcodec/xan.c
+++ b/libavcodec/xan.c
@@ -95,17 +95,18 @@ static av_cold int xan_decode_init(AVCodecContext *avctx)
return 0;
}
-static int xan_huffman_decode(unsigned char *dest, const unsigned char *src,
- int dest_len)
+static int xan_huffman_decode(unsigned char *dest, int dest_len,
+ const unsigned char *src, int src_len)
{
unsigned char byte = *src++;
unsigned char ival = byte + 0x16;
const unsigned char * ptr = src + byte*2;
+ int ptr_len = src_len - 1 - byte*2;
unsigned char val = ival;
unsigned char *dest_end = dest + dest_len;
GetBitContext gb;
- init_get_bits(&gb, ptr, 0); // FIXME: no src size available
+ init_get_bits(&gb, ptr, ptr_len * 8);
while ( val != 0x16 ) {
val = src[val - 0x17 + get_bits1(&gb) * byte];
@@ -270,7 +271,8 @@ static void xan_wc3_decode_frame(XanContext *s) {
vector_segment = s->buf + AV_RL16(&s->buf[4]);
imagedata_segment = s->buf + AV_RL16(&s->buf[6]);
- xan_huffman_decode(opcode_buffer, huffman_segment, opcode_buffer_size);
+ xan_huffman_decode(opcode_buffer, opcode_buffer_size,
+ huffman_segment, s->size - (huffman_segment - s->buf) );
if (imagedata_segment[0] == 2)
xan_unpack(s->buffer2, &imagedata_segment[1], s->buffer2_size);
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