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Fix potentially unaligned accesses in ff_copy_bits()

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A pointer should never be assigned a value which may have less than the
required alignment of the target type.  Compilers may assume pointer
values have the required alignment, and emit normal load/store instructions.

Unaligned pointers should use a character type or compiler-specific
type modifiers.

Originally committed as revision 19318 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Måns Rullgård
2009-07-01 17:48:22 +00:00
parent f7f1eb6cc9
commit ec62d942ea
1 changed files with 2 additions and 3 deletions
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5
libavcodec/bitstream.c
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@@ -78,7 +78,6 @@ void ff_put_string(PutBitContext * pbc, const char *s, int terminate_string)
void ff_copy_bits(PutBitContext *pb, const uint8_t *src, int length)
{
const uint16_t *srcw= (const uint16_t*)src;
int words= length>>4;
int bits= length&15;
int i;
@@ -86,7 +85,7 @@ void ff_copy_bits(PutBitContext *pb, const uint8_t *src, int length)
if(length==0) return;
if(CONFIG_SMALL || words < 16 || put_bits_count(pb)&7){
for(i=0; i<words; i++) put_bits(pb, 16, AV_RB16(&srcw[i]));
for(i=0; i<words; i++) put_bits(pb, 16, AV_RB16(src + 2*i));
}else{
for(i=0; put_bits_count(pb)&31; i++)
put_bits(pb, 8, src[i]);
@@ -95,7 +94,7 @@ void ff_copy_bits(PutBitContext *pb, const uint8_t *src, int length)
skip_put_bytes(pb, 2*words-i);
}
put_bits(pb, bits, AV_RB16(&srcw[words])>>(16-bits));
put_bits(pb, bits, AV_RB16(src + 2*words)>>(16-bits));
}
/* VLC decoding */