dedup

commit 5f4ef6bbdd11dbb7469365a3f244789e4ea15013
parent 5e1aa604d5f99e97f55d41dd0324cec8b4badd5b
Author: sin <sin@2f30.org>
Date:   Fri, 22 Feb 2019 14:00:37 +0000

Precalculate discriminator

Diffstat:
M
chunker.c
 | 
10
+++++-----

1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/chunker.c b/chunker.c
@@ -12,6 +12,7 @@ struct chunker {
 	size_t cap;
 	size_t rpos;
 	size_t wpos;
+	size_t discr;
 	int fd;
 };
 
@@ -22,15 +23,13 @@ calc_discr(size_t avg)
 }
 
 static int
-match_pattern(size_t chunk_size, uint32_t fp)
+match_pattern(struct chunker *chunker, size_t chunk_size, uint32_t fp)
 {
-	size_t discr = calc_discr(BLKSIZE_AVG);
-
 	if (chunk_size >= BLKSIZE_MAX)
 		return 1;
 	if (chunk_size < BLKSIZE_MIN)
 		return 0;
-	return (fp % discr) == discr - 1;
+	return (fp % chunker->discr) == chunker->discr - 1;
 }
 
 static size_t
@@ -60,7 +59,7 @@ get_chunk_size(struct chunker *chunker)
 		if (i > 0)
 			fp = buzh_update(fp, bp[i - 1], bp[chunk_size - 1],
 			                 WINSIZE);
-		if (match_pattern(chunk_size, fp) == 1)
+		if (match_pattern(chunker, chunk_size, fp) == 1)
 			return chunk_size;
 	}
 	return chunk_size;
@@ -82,6 +81,7 @@ alloc_chunker(size_t cap, int fd)
 	chunker->rpos = 0;
 	chunker->wpos = 0;
 	chunker->fd = fd;
+	chunker->discr = calc_discr(BLKSIZE_AVG);
 
 	return chunker;
 }