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memmove/memset patch from Eric Wong

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This commit is contained in:
Josh Coalson
2005-01-25 02:53:04 +00:00
parent 5b60d02640
commit 59ebafb433
1 changed files with 17 additions and 1 deletions
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18
src/libFLAC/bitbuffer.c
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@@ -228,11 +228,27 @@ static FLAC__bool bitbuffer_read_from_client_(FLAC__BitBuffer *bb, FLAC__bool (*
/* first shift the unconsumed buffer data toward the front as much as possible */
if(bb->total_consumed_bits >= FLAC__BITS_PER_BLURB) {
unsigned l = 0, r = bb->consumed_blurbs, r_end = bb->blurbs + (bb->bits? 1:0);
#if FLAC__BITS_PER_BLURB == 8
/*
* memset and memcpy are usually implemented in assembly language
* by the system libc, and they can be much faster
*/
const unsigned r_end = bb->blurbs + (bb->bits? 1:0);
const unsigned r = bb->consumed_blurbs, l = r_end - r;
memmove(&bb->buffer[0], &bb->buffer[r], l);
memset(&bb->buffer[l], 0, r);
#elif FLAC__BITS_PER_BLURB == 32
/* still needs optimization */
const unsigned r_end = bb->blurbs + (bb->bits? 1:0);
unsigned l = 0, r = bb->consumed_blurbs;
for( ; r < r_end; l++, r++)
bb->buffer[l] = bb->buffer[r];
for( ; l < r_end; l++)
bb->buffer[l] = 0;
#else
FLAC__ASSERT(false); /* ERROR, only sizes of 8 and 32 are supported */
#endif /* FLAC__BITS_PER_BLURB == 32 or 8 */
bb->blurbs -= bb->consumed_blurbs;
bb->total_bits -= FLAC__BLURBS_TO_BITS(bb->consumed_blurbs);
bb->consumed_blurbs = 0;