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stb_image: JPEG: Accept 16-bit quantization tables

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This commit is contained in:
Jeremy Sawicki 2017-03-02 22:32:30 -08:00
parent 59a5a155b4
commit e08d398671
1 changed files with 6 additions and 6 deletions
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12
stb_image.h
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@ -1730,7 +1730,7 @@ typedef struct
stbi__context *s;
stbi__huffman huff_dc[4];
stbi__huffman huff_ac[4];
stbi_uc dequant[4][64];
stbi__uint16 dequant[4][64];
stbi__int16 fast_ac[4][1 << FAST_BITS];
// sizes for components, interleaved MCUs
@ -1975,7 +1975,7 @@ static stbi_uc stbi__jpeg_dezigzag[64+15] =
};
// decode one 64-entry block--
static int stbi__jpeg_decode_block(stbi__jpeg *j, short data[64], stbi__huffman *hdc, stbi__huffman *hac, stbi__int16 *fac, int b, stbi_uc *dequant)
static int stbi__jpeg_decode_block(stbi__jpeg *j, short data[64], stbi__huffman *hdc, stbi__huffman *hac, stbi__int16 *fac, int b, stbi__uint16 *dequant)
{
int diff,dc,k;
int t;
@ -2831,7 +2831,7 @@ static int stbi__parse_entropy_coded_data(stbi__jpeg *z)
}
}
static void stbi__jpeg_dequantize(short *data, stbi_uc *dequant)
static void stbi__jpeg_dequantize(short *data, stbi__uint16 *dequant)
{
int i;
for (i=0; i < 64; ++i)
@ -2875,11 +2875,11 @@ static int stbi__process_marker(stbi__jpeg *z, int m)
int q = stbi__get8(z->s);
int p = q >> 4;
int t = q & 15,i;
if (p != 0) return stbi__err("bad DQT type","Corrupt JPEG");
if (p != 0 && p != 1) return stbi__err("bad DQT type","Corrupt JPEG");
if (t > 3) return stbi__err("bad DQT table","Corrupt JPEG");
for (i=0; i < 64; ++i)
z->dequant[t][stbi__jpeg_dezigzag[i]] = stbi__get8(z->s);
L -= 65;
z->dequant[t][stbi__jpeg_dezigzag[i]] = p == 0 ? stbi__get8(z->s) : stbi__get16be(z->s);
L -= p == 0 ? 65 : 129;
}
return L==0;