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lavc/sunrastenc: consider cases with linesize < 0

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Make sunrast_image_write_image() deal with cases when linesize is < 0.
Fix trac ticket #1077.
This commit is contained in:
Stefano Sabatini 2012-03-18 16:55:53 +01:00
parent f645132061
commit 11642cd16f
1 changed files with 8 additions and 9 deletions
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17
libavcodec/sunrastenc.c
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@ -56,7 +56,7 @@ static void sunrast_image_write_image(AVCodecContext *avctx,
{
SUNRASTContext *s = avctx->priv_data;
const uint8_t *ptr;
int len, alen, x;
int len, alen, x, y;
if (s->maplength) { // palettized
PutByteContext pb_r, pb_g;
@ -83,30 +83,30 @@ static void sunrast_image_write_image(AVCodecContext *avctx,
if (s->type == RT_BYTE_ENCODED) {
uint8_t value, value2;
int run;
const uint8_t *end = pixels + avctx->height * linesize;
y = 0;
ptr = pixels;
#define GET_VALUE ptr >= end ? 0 : x >= len ? ptr[len-1] : ptr[x]
#define GET_VALUE y >= avctx->height ? 0 : x >= len ? ptr[len-1] : ptr[x]
x = 0;
x = 0, y = 0;
value2 = GET_VALUE;
while (ptr < end) {
while (y < avctx->height) {
run = 1;
value = value2;
x++;
if (x >= alen) {
x = 0;
ptr += linesize;
ptr += linesize, y++;
}
value2 = GET_VALUE;
while (value2 == value && run < 256 && ptr < end) {
while (value2 == value && run < 256 && y < avctx->height) {
x++;
run++;
if (x >= alen) {
x = 0;
ptr += linesize;
ptr += linesize, y++;
}
value2 = GET_VALUE;
}
@ -125,7 +125,6 @@ static void sunrast_image_write_image(AVCodecContext *avctx,
// update data length for header
s->length = bytestream2_tell_p(&s->p) - 32 - s->maplength;
} else {
int y;
for (y = 0; y < avctx->height; y++) {
bytestream2_put_buffer(&s->p, ptr, len);
if (len < alen)