[PATCH v2 06/15] pack-revindex: express constants in terms of the_hash_algo

[brian m. carlson]

Express the various constants used in terms of the_hash_algo.
While we're at it, fix a comment style issue as well.

Reviewed-by: Stefan Beller <sbel...@google.com>
Signed-off-by: brian m. carlson <sand...@crustytoothpaste.net>
---
 pack-revindex.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/pack-revindex.c b/pack-revindex.c
index bb521cf7fb..3c58784a5f 100644
--- a/pack-revindex.c
+++ b/pack-revindex.c
@@ -122,13 +122,14 @@ static void create_pack_revindex(struct packed_git *p)
        unsigned num_ent = p->num_objects;
        unsigned i;
        const char *index = p->index_data;
+       const unsigned hashsz = the_hash_algo->rawsz;
 
        ALLOC_ARRAY(p->revindex, num_ent + 1);
        index += 4 * 256;
 
        if (p->index_version > 1) {
                const uint32_t *off_32 =
-                       (uint32_t *)(index + 8 + p->num_objects * (20 + 4));
+                       (uint32_t *)(index + 8 + p->num_objects * (hashsz + 4));
                const uint32_t *off_64 = off_32 + p->num_objects;
                for (i = 0; i < num_ent; i++) {
                        uint32_t off = ntohl(*off_32++);
@@ -142,16 +143,17 @@ static void create_pack_revindex(struct packed_git *p)
                }
        } else {
                for (i = 0; i < num_ent; i++) {
-                       uint32_t hl = *((uint32_t *)(index + 24 * i));
+                       uint32_t hl = *((uint32_t *)(index + (hashsz + 4) * i));
                        p->revindex[i].offset = ntohl(hl);
                        p->revindex[i].nr = i;
                }
        }
 
-       /* This knows the pack format -- the 20-byte trailer
+       /*
+        * This knows the pack format -- the hash trailer
         * follows immediately after the last object data.
         */
-       p->revindex[num_ent].offset = p->pack_size - 20;
+       p->revindex[num_ent].offset = p->pack_size - hashsz;
        p->revindex[num_ent].nr = -1;
        sort_revindex(p->revindex, num_ent, p->pack_size);
 }