packfile: use get_be64() for large offsets

The pack-index version 2 format uses two 4-byte integers in
network-byte order to represent one 8-byte value. The current
implementation has several code clones for stitching these integers
together.

Use get_be64() to create an 8-byte integer from two 4-byte integers
represented this way.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Reviewed-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/pack-revindex.c b/pack-revindex.c
index 1b7ebd8d7eefbcc646867db3e52536b4aac42208..ff5f62c03326a7f01926c72a19be5029ae4c1a8b 100644 (file)
--- a/pack-revindex.c
+++ b/pack-revindex.c
@@ -134,10 +134,8 @@ static void create_pack_revindex(struct packed_git *p)
                        if (!(off & 0x80000000)) {
                                p->revindex[i].offset = off;
                        } else {
-                               p->revindex[i].offset =
-                                       ((uint64_t)ntohl(*off_64++)) << 32;
-                               p->revindex[i].offset |=
-                                       ntohl(*off_64++);
+                               p->revindex[i].offset = get_be64(off_64);
+                               off_64 += 2;
                        }
                        p->revindex[i].nr = i;
                }

diff --git a/packfile.c b/packfile.c
index 4a5fe7ab1883843a389ce74bf1c7bd89890d8e51..228ed0d59a9154924238473dec3ff8829eb8e8b0 100644 (file)
--- a/packfile.c
+++ b/packfile.c
@@ -1702,8 +1702,7 @@ off_t nth_packed_object_offset(const struct packed_git *p, uint32_t n)
                        return off;
                index += p->num_objects * 4 + (off & 0x7fffffff) * 8;
                check_pack_index_ptr(p, index);
-               return (((uint64_t)ntohl(*((uint32_t *)(index + 0)))) << 32) |
-                                  ntohl(*((uint32_t *)(index + 4)));
+               return get_be64(index);
        }
 }