pack-objects: small cleanup

Better encapsulate delta creation for writing.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin-pack-objects.c b/builtin-pack-objects.c
index 777f272668c39931b330be555f41399adfbce397..8691c99518124420edd1c6ab5ddf70fb0413e37d 100644 (file)
--- a/builtin-pack-objects.c
+++ b/builtin-pack-objects.c
@@ -102,21 +102,24 @@ static uint32_t written, written_delta;
 static uint32_t reused, reused_delta;
 
 
-static void *delta_against(void *buf, unsigned long size, struct object_entry *entry)
+static void *get_delta(struct object_entry *entry)
 {
-       unsigned long othersize, delta_size;
+       unsigned long size, base_size, delta_size;
+       void *buf, *base_buf, *delta_buf;
        enum object_type type;
-       void *otherbuf = read_sha1_file(entry->delta->idx.sha1, &type, &othersize);
-       void *delta_buf;
 
-       if (!otherbuf)
+       buf = read_sha1_file(entry->idx.sha1, &type, &size);
+       if (!buf)
+               die("unable to read %s", sha1_to_hex(entry->idx.sha1));
+       base_buf = read_sha1_file(entry->delta->idx.sha1, &type, &base_size);
+       if (!base_buf)
                die("unable to read %s", sha1_to_hex(entry->delta->idx.sha1));
-        delta_buf = diff_delta(otherbuf, othersize,
+       delta_buf = diff_delta(base_buf, base_size,
                               buf, size, &delta_size, 0);
-        if (!delta_buf || delta_size != entry->delta_size)
+       if (!delta_buf || delta_size != entry->delta_size)
                die("delta size changed");
-        free(buf);
-        free(otherbuf);
+       free(buf);
+       free(base_buf);
        return delta_buf;
 }
 
@@ -223,7 +226,6 @@ static unsigned long write_object(struct sha1file *f,
                                  off_t write_offset)
 {
        unsigned long size;
-       enum object_type type;
        void *buf;
        unsigned char header[10];
        unsigned char dheader[10];
@@ -281,10 +283,7 @@ static unsigned long write_object(struct sha1file *f,
                        obj_type = (allow_ofs_delta && entry->delta->idx.offset) ?
                                OBJ_OFS_DELTA : OBJ_REF_DELTA;
                } else {
-                       buf = read_sha1_file(entry->idx.sha1, &type, &size);
-                       if (!buf)
-                               die("unable to read %s", sha1_to_hex(entry->idx.sha1));
-                       buf = delta_against(buf, size, entry);
+                       buf = get_delta(entry);
                        size = entry->delta_size;
                        obj_type = (allow_ofs_delta && entry->delta->idx.offset) ?
                                OBJ_OFS_DELTA : OBJ_REF_DELTA;