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stb_image: Apply https://github.com/nothings/stb/pull/1443

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This commit is contained in:
Neil Bickford 2023-03-29 12:00:24 -07:00
parent af4456ba68
commit b5d27fd151
1 changed files with 4 additions and 4 deletions
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8
stb_image.h
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@ -2221,7 +2221,7 @@ static int stbi__jpeg_decode_block(stbi__jpeg *j, short data[64], stbi__huffman
if (!stbi__addints_valid(j->img_comp[b].dc_pred, diff)) return stbi__err("bad delta","Corrupt JPEG");
dc = j->img_comp[b].dc_pred + diff;
j->img_comp[b].dc_pred = dc;
if (!stbi__mul2shorts_valid(dc, dequant[0])) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
if ((dc > SHRT_MAX) || (dequant[0] > SHRT_MAX) || !stbi__mul2shorts_valid((short) dc, (short) dequant[0])) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
data[0] = (short) (dc * dequant[0]);
// decode AC components, see JPEG spec
@ -2278,7 +2278,7 @@ static int stbi__jpeg_decode_block_prog_dc(stbi__jpeg *j, short data[64], stbi__
if (!stbi__addints_valid(j->img_comp[b].dc_pred, diff)) return stbi__err("bad delta", "Corrupt JPEG");
dc = j->img_comp[b].dc_pred + diff;
j->img_comp[b].dc_pred = dc;
if (!stbi__mul2shorts_valid(dc, 1 << j->succ_low)) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
if ((dc > SHRT_MAX) || !stbi__mul2shorts_valid((short) dc, 1 << j->succ_low)) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
data[0] = (short) (dc * (1 << j->succ_low));
} else {
// refinement scan for DC coefficient
@ -3384,12 +3384,12 @@ static int stbi__decode_jpeg_header(stbi__jpeg *z, int scan)
return 1;
}
static int stbi__skip_jpeg_junk_at_end(stbi__jpeg *j)
static stbi_uc stbi__skip_jpeg_junk_at_end(stbi__jpeg *j)
{
// some JPEGs have junk at end, skip over it but if we find what looks
// like a valid marker, resume there
while (!stbi__at_eof(j->s)) {
int x = stbi__get8(j->s);
stbi_uc x = stbi__get8(j->s);
while (x == 255) { // might be a marker
if (stbi__at_eof(j->s)) return STBI__MARKER_none;
x = stbi__get8(j->s);