From d72308e01c5977177cda0aed06cfeee9192e1247 Mon Sep 17 00:00:00 2001 From: Nicolas Pitre Date: Wed, 4 Apr 2007 16:49:04 -0400 Subject: [PATCH] clean up and optimize nth_packed_object_sha1() usage Let's avoid the open coded pack index reference in pack-object and use nth_packed_object_sha1() instead. This will help encapsulating index format differences in one place. And while at it there is no reason to copy SHA1's over and over while a direct pointer to it in the index will do just fine. Signed-off-by: Nicolas Pitre Acked-by: Shawn O. Pearce Signed-off-by: Junio C Hamano --- builtin-fsck.c | 9 +++------ builtin-pack-objects.c | 2 +- cache.h | 2 +- pack-check.c | 11 +++++++---- sha1_file.c | 9 ++++----- sha1_name.c | 16 ++++++++-------- 6 files changed, 24 insertions(+), 25 deletions(-) diff --git a/builtin-fsck.c b/builtin-fsck.c index 21f1f9e91..4e5aa33df 100644 --- a/builtin-fsck.c +++ b/builtin-fsck.c @@ -348,7 +348,7 @@ static int fsck_tag(struct tag *tag) return 0; } -static int fsck_sha1(unsigned char *sha1) +static int fsck_sha1(const unsigned char *sha1) { struct object *obj = parse_object(sha1); if (!obj) { @@ -648,11 +648,8 @@ int cmd_fsck(int argc, char **argv, const char *prefix) for (p = packed_git; p; p = p->next) { uint32_t i, num = num_packed_objects(p); - for (i = 0; i < num; i++) { - unsigned char sha1[20]; - nth_packed_object_sha1(p, i, sha1); - fsck_sha1(sha1); - } + for (i = 0; i < num; i++) + fsck_sha1(nth_packed_object_sha1(p, i)); } } diff --git a/builtin-pack-objects.c b/builtin-pack-objects.c index b5f9648e8..45ac3e482 100644 --- a/builtin-pack-objects.c +++ b/builtin-pack-objects.c @@ -222,7 +222,7 @@ static const unsigned char *find_packed_object_name(struct packed_git *p, off_t ofs) { struct revindex_entry *entry = find_packed_object(p, ofs); - return ((unsigned char *)p->index_data) + 4 * 256 + 24 * entry->nr + 4; + return nth_packed_object_sha1(p, entry->nr); } static void *delta_against(void *buf, unsigned long size, struct object_entry *entry) diff --git a/cache.h b/cache.h index 384b26022..1f128d55d 100644 --- a/cache.h +++ b/cache.h @@ -428,7 +428,7 @@ extern unsigned char* use_pack(struct packed_git *, struct pack_window **, off_t extern void unuse_pack(struct pack_window **); extern struct packed_git *add_packed_git(const char *, int, int); extern uint32_t num_packed_objects(const struct packed_git *p); -extern int nth_packed_object_sha1(const struct packed_git *, uint32_t, unsigned char*); +extern const unsigned char *nth_packed_object_sha1(const struct packed_git *, uint32_t); extern off_t find_pack_entry_one(const unsigned char *, struct packed_git *); extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *); extern unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep); diff --git a/pack-check.c b/pack-check.c index d9883225e..f58083d11 100644 --- a/pack-check.c +++ b/pack-check.c @@ -42,13 +42,14 @@ static int verify_packfile(struct packed_git *p, */ nr_objects = num_packed_objects(p); for (i = 0, err = 0; i < nr_objects; i++) { - unsigned char sha1[20]; + const unsigned char *sha1; void *data; enum object_type type; unsigned long size; off_t offset; - if (nth_packed_object_sha1(p, i, sha1)) + sha1 = nth_packed_object_sha1(p, i); + if (!sha1) die("internal error pack-check nth-packed-object"); offset = find_pack_entry_one(sha1, p); if (!offset) @@ -82,14 +83,16 @@ static void show_pack_info(struct packed_git *p) memset(chain_histogram, 0, sizeof(chain_histogram)); for (i = 0; i < nr_objects; i++) { - unsigned char sha1[20], base_sha1[20]; + const unsigned char *sha1; + unsigned char base_sha1[20]; const char *type; unsigned long size; unsigned long store_size; off_t offset; unsigned int delta_chain_length; - if (nth_packed_object_sha1(p, i, sha1)) + sha1 = nth_packed_object_sha1(p, i); + if (!sha1) die("internal error pack-check nth-packed-object"); offset = find_pack_entry_one(sha1, p); if (!offset) diff --git a/sha1_file.c b/sha1_file.c index 9c2603842..4304fe9bb 100644 --- a/sha1_file.c +++ b/sha1_file.c @@ -1532,15 +1532,14 @@ uint32_t num_packed_objects(const struct packed_git *p) return (uint32_t)((p->index_size - 20 - 20 - 4*256) / 24); } -int nth_packed_object_sha1(const struct packed_git *p, uint32_t n, - unsigned char* sha1) +const unsigned char *nth_packed_object_sha1(const struct packed_git *p, + uint32_t n) { const unsigned char *index = p->index_data; index += 4 * 256; if (num_packed_objects(p) <= n) - return -1; - hashcpy(sha1, index + 24 * n + 4); - return 0; + return NULL; + return index + 24 * n + 4; } off_t find_pack_entry_one(const unsigned char *sha1, diff --git a/sha1_name.c b/sha1_name.c index bede0e5b0..267ea3f3e 100644 --- a/sha1_name.c +++ b/sha1_name.c @@ -71,7 +71,7 @@ static int match_sha(unsigned len, const unsigned char *a, const unsigned char * static int find_short_packed_object(int len, const unsigned char *match, unsigned char *sha1) { struct packed_git *p; - unsigned char found_sha1[20]; + const unsigned char *found_sha1 = NULL; int found = 0; prepare_packed_git(); @@ -80,10 +80,10 @@ static int find_short_packed_object(int len, const unsigned char *match, unsigne uint32_t first = 0, last = num; while (first < last) { uint32_t mid = (first + last) / 2; - unsigned char now[20]; + const unsigned char *now; int cmp; - nth_packed_object_sha1(p, mid, now); + now = nth_packed_object_sha1(p, mid); cmp = hashcmp(match, now); if (!cmp) { first = mid; @@ -96,14 +96,14 @@ static int find_short_packed_object(int len, const unsigned char *match, unsigne last = mid; } if (first < num) { - unsigned char now[20], next[20]; - nth_packed_object_sha1(p, first, now); + const unsigned char *now, *next; + now = nth_packed_object_sha1(p, first); if (match_sha(len, match, now)) { - if (nth_packed_object_sha1(p, first+1, next) || - !match_sha(len, match, next)) { + next = nth_packed_object_sha1(p, first+1); + if (!next|| !match_sha(len, match, next)) { /* unique within this pack */ if (!found) { - hashcpy(found_sha1, now); + found_sha1 = now; found++; } else if (hashcmp(found_sha1, now)) { -- 2.30.2