dedup

commit 4122001dbfb14b263965c955e865a6c04151fbbc
parent 4106dd721d10db6f7ba0fe25009a85be8c5bee61
Author: sin <sin@2f30.org>
Date:   Sun, 10 Mar 2019 10:25:26 +0000

Factor out snapshot hash calculation to a function

Diffstat:
M
dedup.c
 | 
37
+++++++++++++++++++++----------------

1 file changed, 21 insertions(+), 16 deletions(-)
diff --git a/dedup.c b/dedup.c
@@ -88,6 +88,26 @@ free_snap(struct snapshot *snap)
 	free(snap);
 }
 
+/*
+ * The snapshot hash is calculated over the
+ * hash of its block descriptors.
+ */
+static void
+hash_snap(struct snapshot *snap, uint8_t *md)
+{
+	SHA256_CTX ctx;
+	uint64_t i;
+
+	SHA256_Init(&ctx);
+	for (i = 0; i < snap->nr_blk_descs; i++) {
+		struct blk_desc *blk_desc;
+
+		blk_desc = &snap->blk_desc[i];
+		SHA256_Update(&ctx, blk_desc->md, sizeof(blk_desc->md));
+	}
+	SHA256_Final(md, &ctx);
+}
+
 static struct snapshot *
 grow_snap(struct snapshot *snap, uint64_t nr_blk_descs)
 {
@@ -245,22 +265,7 @@ dedup(int fd, char *msg)
 	}
 
 	if (snap->nr_blk_descs > 0) {
-		SHA256_CTX ctx;
-		uint64_t i;
-
-		/*
-		 * The snapshot hash is calculated over the
-		 * hash of its block descriptors.
-		 */
-		SHA256_Init(&ctx);
-		for (i = 0; i < snap->nr_blk_descs; i++) {
-			struct blk_desc *blk_desc;
-
-			blk_desc = &snap->blk_desc[i];
-			SHA256_Update(&ctx, blk_desc->md,
-			              sizeof(blk_desc->md));
-		}
-		SHA256_Final(snap->md, &ctx);
+		hash_snap(snap, snap->md);
 
 		if (msg != NULL) {
 			size_t size;