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fix some signed shifts that should have been unsigned for C spec reasons

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This commit is contained in:
Sean Barrett 2015-09-03 10:24:01 -07:00
parent 0e24ec5feb
commit 7670656322
1 changed files with 7 additions and 3 deletions
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10
stb_vorbis.c
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@ -36,6 +36,8 @@
//
// Partial history:
// 1.06 - 2015/08/31 - full, correct support for seeking API (Dougall Johnson)
// some crash fixes when out of memory or with corrupt files
// fix some inappropriately signed shifts
// 1.05 - 2015/04/19 - don't define __forceinline if it's redundant
// 1.04 - 2014/08/27 - fix missing const-correct case in API
// 1.03 - 2014/08/07 - warning fixes
@ -934,7 +936,7 @@ static void crc32_init(void)
int i,j;
uint32 s;
for(i=0; i < 256; i++) {
for (s=i<<24, j=0; j < 8; ++j)
for (s=(uint32) i << 24, j=0; j < 8; ++j)
s = (s << 1) ^ (s >= (1U<<31) ? CRC32_POLY : 0);
crc_table[i] = s;
}
@ -1035,7 +1037,7 @@ static int compute_codewords(Codebook *c, uint8 *len, int n, uint32 *values)
add_entry(c, 0, k, m++, len[k], values);
// add all available leaves
for (i=1; i <= len[k]; ++i)
available[i] = 1 << (32-i);
available[i] = 1U << (32-i);
// note that the above code treats the first case specially,
// but it's really the same as the following code, so they
// could probably be combined (except the initial code is 0,
@ -1564,7 +1566,7 @@ static __forceinline void prep_huffman(vorb *f)
if (f->last_seg && !f->bytes_in_seg) return;
z = get8_packet_raw(f);
if (z == EOP) return;
f->acc += z << f->valid_bits;
f->acc += (unsigned) z << f->valid_bits;
f->valid_bits += 8;
} while (f->valid_bits <= 24);
}
@ -5383,6 +5385,8 @@ int stb_vorbis_get_samples_float(stb_vorbis *f, int channels, float **buffer, in
#endif // STB_VORBIS_NO_PULLDATA_API
/* Version history
1.06 - 2015/08/31 - full, correct support for seeking API (Dougall Johnson)
some crash fixes when out of memory or with corrupt files
1.05 - 2015/04/19 - don't define __forceinline if it's redundant
1.04 - 2014/08/27 - fix missing const-correct case in API
1.03 - 2014/08/07 - Warning fixes