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avcodec/xbmenc: substitute end instead of recalculating end 

Minor speed increase, end is calculated before entering parse_str_int(),
so let's take advantage of the value and avoid recalculating twice more.
This also allows parse_str_int() to work with file size larger than int.

Signed-off-by: Joe Da Silva <digital@joescat.com>
This commit is contained in:
Jose Da Silva 2021-01-31 19:50:49 -08:00 committed by Paul B Mahol
parent b4ad669a42
commit b6bc981d25
1 changed files with 3 additions and 5 deletions
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8
libavcodec/xbmdec.c
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@ -37,10 +37,8 @@ static int convert(uint8_t x)
return x;
}
static int parse_str_int(const uint8_t *p, int len, const uint8_t *key)
static int parse_str_int(const uint8_t *p, const uint8_t *end, const uint8_t *key)
{
const uint8_t *end = p + len;
for(; p<end - strlen(key); p++) {
if (!memcmp(p, key, strlen(key)))
break;
@ -72,8 +70,8 @@ static int xbm_decode_frame(AVCodecContext *avctx, void *data,
avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
end = avpkt->data + avpkt->size;
width = parse_str_int(avpkt->data, avpkt->size, "_width");
height = parse_str_int(avpkt->data, avpkt->size, "_height");
width = parse_str_int(avpkt->data, end, "_width");
height = parse_str_int(avpkt->data, end, "_height");
if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
return ret;