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Pad the decompression buffer and use av_memcpy_backptr for the mszh decompression.

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Originally committed as revision 19054 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2009-05-31 10:42:26 +00:00
parent 974ce78544
commit 0d48e6ec7f
1 changed files with 5 additions and 5 deletions
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10
libavcodec/lcldec.c
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@ -44,6 +44,7 @@
#include "avcodec.h"
#include "bytestream.h"
#include "lcl.h"
#include "libavutil/lzo.h"
#if CONFIG_ZLIB_DECODER
#include <zlib.h>
@ -73,6 +74,7 @@ typedef struct LclDecContext {
/**
* \param srcptr compressed source buffer, must be padded with at least 4 extra bytes
* \param destptr must be padded sufficiently for av_memcpy_backptr
*/
static unsigned int mszh_decomp(const unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)
{
@ -103,10 +105,8 @@ static unsigned int mszh_decomp(const unsigned char * srcptr, int srclen, unsign
if (destptr_end - destptr < cnt) {
cnt = destptr_end - destptr;
}
for (; cnt > 0; cnt--) {
*destptr = *(destptr - ofs);
destptr++;
}
av_memcpy_backptr(destptr, ofs, cnt);
destptr += cnt;
}
}
@ -445,7 +445,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
{
LclDecContext * const c = avctx->priv_data;
unsigned int basesize = avctx->width * avctx->height;
unsigned int max_basesize = FFALIGN(avctx->width, 4) * FFALIGN(avctx->height, 4);
unsigned int max_basesize = FFALIGN(avctx->width, 4) * FFALIGN(avctx->height, 4) + AV_LZO_OUTPUT_PADDING;
unsigned int max_decomp_size;
c->pic.data[0] = NULL;