/**
- * \param srcptr compressed source buffer, must be padded with at least 4 extra bytes
+ * \param srcptr compressed source buffer, must be padded with at least 5 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)
unsigned char *destptr_bak = destptr;
unsigned char *destptr_end = destptr + destsize;
const unsigned char *srcptr_end = srcptr + srclen;
- unsigned char mask = 0;
- unsigned char maskbit = 0;
- unsigned int ofs, cnt;
+ unsigned mask = *srcptr++;
+ unsigned maskbit = 0x80;
while (srcptr < srcptr_end && destptr < destptr_end) {
- if (maskbit == 0) {
- mask = *srcptr++;
- maskbit = 0x80;
- continue;
- }
if (!(mask & maskbit)) {
memcpy(destptr, srcptr, 4);
destptr += 4;
srcptr += 4;
} else {
- ofs = bytestream_get_le16(&srcptr);
- cnt = (ofs >> 11) + 1;
+ unsigned ofs = bytestream_get_le16(&srcptr);
+ unsigned cnt = (ofs >> 11) + 1;
ofs &= 0x7ff;
+ ofs = FFMIN(ofs, destptr - destptr_bak);
cnt *= 4;
cnt = FFMIN(cnt, destptr_end - destptr);
av_memcpy_backptr(destptr, ofs, cnt);
destptr += cnt;
}
maskbit >>= 1;
+ if (!maskbit) {
+ mask = *srcptr++;
+ while (!mask) {
+ if (destptr_end - destptr < 32 || srcptr_end - srcptr < 32) break;
+ memcpy(destptr, srcptr, 32);
+ destptr += 32;
+ srcptr += 32;
+ mask = *srcptr++;
+ }
+ maskbit = 0x80;
+ }
}
return destptr - destptr_bak;
* \param offset offset in decomp_buf
* \param expected expected decompressed length
*/
+#if CONFIG_ZLIB_DECODER
static int zlib_decomp(AVCodecContext *avctx, const uint8_t *src, int src_len, int offset, int expected)
{
LclDecContext *c = avctx->priv_data;
}
return c->zstream.total_out;
}
+#endif
/*
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;
-
-#if CONFIG_ZLIB_DECODER
- // Needed if zlib unused or init aborted before inflateInit
- memset(&c->zstream, 0, sizeof(z_stream));
-#endif
-
if (avctx->extradata_size < 8) {
av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
return 1;
}
- if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
- return 1;
- }
-
/* Check codec type */
if ((avctx->codec_id == CODEC_ID_MSZH && avctx->extradata[7] != CODEC_MSZH) ||
(avctx->codec_id == CODEC_ID_ZLIB && avctx->extradata[7] != CODEC_ZLIB)) {
zret = inflateInit(&c->zstream);
if (zret != Z_OK) {
av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
+ av_freep(&c->decomp_buf);
return 1;
}
}
{
LclDecContext * const c = avctx->priv_data;
+ av_freep(&c->decomp_buf);
if (c->pic.data[0])
avctx->release_buffer(avctx, &c->pic);
#if CONFIG_ZLIB_DECODER
- inflateEnd(&c->zstream);
+ if (avctx->codec_id == CODEC_ID_ZLIB)
+ inflateEnd(&c->zstream);
#endif
return 0;