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md5: avoid unnecessary copying. 

Where necessary use memcpy instead.
Thanks to Giorgio Vazzana [mywing81 gmail] for
spotting this loop as the cause for the bad
performance.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
This commit is contained in:
Reimar Döffinger 2013-05-17 20:28:03 +02:00
parent 47ac344970
commit 24c65eb29f
2 changed files with 28 additions and 8 deletions
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34
libavutil/md5.c
View File

@ -139,20 +139,40 @@ void av_md5_init(AVMD5 *ctx)
ctx->ABCD[3] = 0x67452301;
}
void av_md5_update(AVMD5 *ctx, const uint8_t *src, const int len)
void av_md5_update(AVMD5 *ctx, const uint8_t *src, int len)
{
int i, j;
const uint8_t *end;
int j;
j = ctx->len & 63;
ctx->len += len;
for (i = 0; i < len; i++) {
ctx->block[j++] = src[i];
if (j == 64) {
body(ctx->ABCD, (uint32_t *) ctx->block);
j = 0;
if (j) {
int cnt = FFMIN(len, 64 - j);
memcpy(ctx->block + j, src, cnt);
src += cnt;
len -= cnt;
if (j + cnt < 64)
return;
body(ctx->ABCD, (uint32_t *)ctx->block);
}
end = src + (len & ~63);
if (HAVE_BIGENDIAN || (!HAVE_FAST_UNALIGNED && ((intptr_t)src & 3))) {
while (src < end) {
memcpy(ctx->block, src, 64);
body(ctx->ABCD, (uint32_t *) ctx->block);
src += 64;
}
} else {
while (src < end) {
body(ctx->ABCD, (uint32_t *)src);
src += 64;
}
}
len &= 63;
if (len > 0)
memcpy(ctx->block, src, len);
}
void av_md5_final(AVMD5 *ctx, uint8_t *dst)

2
libavutil/md5.h
View File

@ -38,7 +38,7 @@ struct AVMD5;
struct AVMD5 *av_md5_alloc(void);
void av_md5_init(struct AVMD5 *ctx);
void av_md5_update(struct AVMD5 *ctx, const uint8_t *src, const int len);
void av_md5_update(struct AVMD5 *ctx, const uint8_t *src, int len);
void av_md5_final(struct AVMD5 *ctx, uint8_t *dst);
void av_md5_sum(uint8_t *dst, const uint8_t *src, const int len);