There are several instances of the constant 20 and 20-based values in
the packfile code. Abstract away dependence on SHA-1 by using the
values from the_hash_algo instead.
Use unsigned values for temporary constants to provide the compiler with
more information about what kinds of values it should expect.
Signed-off-by: brian m. carlson <sandals@xxxxxxxxxxxxxxxxxxxx>
---
packfile.c | 66 ++++++++++++++++++++++++++++++------------------------
1 file changed, 37 insertions(+), 29 deletions(-)
diff --git a/packfile.c b/packfile.c
index 84acd405e0..b7bc4eab17 100644
--- a/packfile.c
+++ b/packfile.c
@@ -84,6 +84,7 @@ static int check_packed_git_idx(const char *path, struct packed_git *p)
uint32_t version, nr, i, *index;
int fd = git_open(path);
struct stat st;
+ const unsigned int hashsz = the_hash_algo->rawsz;
if (fd < 0)
return -1;
@@ -92,7 +93,7 @@ static int check_packed_git_idx(const char *path, struct packed_git *p)
return -1;
}
idx_size = xsize_t(st.st_size);
- if (idx_size < 4 * 256 + 20 + 20) {
+ if (idx_size < 4 * 256 + hashsz + hashsz) {
close(fd);
return error("index file %s is too small", path);
}
@@ -129,11 +130,11 @@ static int check_packed_git_idx(const char *path, struct packed_git *p)
/*
* Total size:
* - 256 index entries 4 bytes each
- * - 24-byte entries * nr (20-byte sha1 + 4-byte offset)
- * - 20-byte SHA1 of the packfile
- * - 20-byte SHA1 file checksum
+ * - 24-byte entries * nr (object ID + 4-byte offset)
+ * - hash of the packfile
+ * - file checksum
*/
- if (idx_size != 4*256 + nr * 24 + 20 + 20) {
+ if (idx_size != 4*256 + nr * (hashsz + 4) + hashsz + hashsz) {
munmap(idx_map, idx_size);
return error("wrong index v1 file size in %s", path);
}
@@ -142,16 +143,16 @@ static int check_packed_git_idx(const char *path, struct packed_git *p)
* Minimum size:
* - 8 bytes of header
* - 256 index entries 4 bytes each
- * - 20-byte sha1 entry * nr
+ * - object ID entry * nr
* - 4-byte crc entry * nr
* - 4-byte offset entry * nr
- * - 20-byte SHA1 of the packfile
- * - 20-byte SHA1 file checksum
+ * - hash of the packfile
+ * - file checksum
* And after the 4-byte offset table might be a
* variable sized table containing 8-byte entries
* for offsets larger than 2^31.
*/
- unsigned long min_size = 8 + 4*256 + nr*(20 + 4 + 4) + 20 + 20;
+ unsigned long min_size = 8 + 4*256 + nr*(hashsz + 4 + 4) + hashsz + hashsz;
unsigned long max_size = min_size;
if (nr)
max_size += (nr - 1)*8;
@@ -444,10 +445,11 @@ static int open_packed_git_1(struct packed_git *p)
{
struct stat st;
struct pack_header hdr;
- unsigned char sha1[20];
- unsigned char *idx_sha1;
+ unsigned char hash[GIT_MAX_RAWSZ];
+ unsigned char *idx_hash;
long fd_flag;
ssize_t read_result;
+ const unsigned hashsz = the_hash_algo->rawsz;
if (!p->index_data && open_pack_index(p))
return error("packfile %s index unavailable", p->pack_name);
@@ -507,15 +509,15 @@ static int open_packed_git_1(struct packed_git *p)
" while index indicates %"PRIu32" objects",
p->pack_name, ntohl(hdr.hdr_entries),
p->num_objects);
- if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1)
+ if (lseek(p->pack_fd, p->pack_size - hashsz, SEEK_SET) == -1)
return error("end of packfile %s is unavailable", p->pack_name);
- read_result = read_in_full(p->pack_fd, sha1, sizeof(sha1));
+ read_result = read_in_full(p->pack_fd, hash, hashsz);
if (read_result < 0)
return error_errno("error reading from %s", p->pack_name);
- if (read_result != sizeof(sha1))
+ if (read_result != hashsz)
return error("packfile %s signature is unavailable", p->pack_name);
- idx_sha1 = ((unsigned char *)p->index_data) + p->index_size - 40;
- if (hashcmp(sha1, idx_sha1))
+ idx_hash = ((unsigned char *)p->index_data) + p->index_size - hashsz * 2;
+ if (hashcmp(hash, idx_hash))
return error("packfile %s does not match index", p->pack_name);
return 0;
}
@@ -530,7 +532,7 @@ static int open_packed_git(struct packed_git *p)
static int in_window(struct pack_window *win, off_t offset)
{
- /* We must promise at least 20 bytes (one hash) after the
+ /* We must promise at least one full hash after the
* offset is available from this window, otherwise the offset
* is not actually in this window and a different window (which
* has that one hash excess) must be used. This is to support
@@ -538,7 +540,7 @@ static int in_window(struct pack_window *win, off_t offset)
*/
off_t win_off = win->offset;
return win_off <= offset
- && (offset + 20) <= (win_off + win->len);
+ && (offset + the_hash_algo->rawsz) <= (win_off + win->len);
}
unsigned char *use_pack(struct packed_git *p,
@@ -555,7 +557,7 @@ unsigned char *use_pack(struct packed_git *p,
*/
if (!p->pack_size && p->pack_fd == -1 && open_packed_git(p))
die("packfile %s cannot be accessed", p->pack_name);
- if (offset > (p->pack_size - 20))
+ if (offset > (p->pack_size - the_hash_algo->rawsz))
die("offset beyond end of packfile (truncated pack?)");
if (offset < 0)
die(_("offset before end of packfile (broken .idx?)"));
@@ -675,7 +677,8 @@ struct packed_git *add_packed_git(const char *path, size_t path_len, int local)
p->pack_size = st.st_size;
p->pack_local = local;
p->mtime = st.st_mtime;
- if (path_len < 40 || get_sha1_hex(path + path_len - 40, p->sha1))
+ if (path_len < the_hash_algo->hexsz ||
+ get_sha1_hex(path + path_len - the_hash_algo->hexsz, p->sha1))
hashclr(p->sha1);
return p;
}
@@ -1028,7 +1031,8 @@ const struct packed_git *has_packed_and_bad(const unsigned char *sha1)
for (p = the_repository->objects->packed_git; p; p = p->next)
for (i = 0; i < p->num_bad_objects; i++)
- if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i))
+ if (!hashcmp(sha1,
+ p->bad_object_sha1 + the_hash_algo->rawsz * i))
return p;
return NULL;
}
@@ -1066,7 +1070,7 @@ static off_t get_delta_base(struct packed_git *p,
} else if (type == OBJ_REF_DELTA) {
/* The base entry _must_ be in the same pack */
base_offset = find_pack_entry_one(base_info, p);
- *curpos += 20;
+ *curpos += the_hash_algo->rawsz;
} else
die("I am totally screwed");
return base_offset;
@@ -1671,6 +1675,7 @@ int bsearch_pack(const struct object_id *oid, const struct packed_git *p, uint32
{
const unsigned char *index_fanout = p->index_data;
const unsigned char *index_lookup;
+ const unsigned int hashsz = the_hash_algo->rawsz;
int index_lookup_width;
if (!index_fanout)
@@ -1678,10 +1683,10 @@ int bsearch_pack(const struct object_id *oid, const struct packed_git *p, uint32
index_lookup = index_fanout + 4 * 256;
if (p->index_version == 1) {
- index_lookup_width = 24;
+ index_lookup_width = hashsz + 4;
index_lookup += 4;
} else {
- index_lookup_width = 20;
+ index_lookup_width = hashsz;
index_fanout += 8;
index_lookup += 8;
}
@@ -1694,6 +1699,7 @@ const unsigned char *nth_packed_object_sha1(struct packed_git *p,
uint32_t n)
{
const unsigned char *index = p->index_data;
+ const unsigned int hashsz = the_hash_algo->rawsz;
if (!index) {
if (open_pack_index(p))
return NULL;
@@ -1703,10 +1709,10 @@ const unsigned char *nth_packed_object_sha1(struct packed_git *p,
return NULL;
index += 4 * 256;
if (p->index_version == 1) {
- return index + 24 * n + 4;
+ return index + (hashsz + 4) * n + 4;
} else {
index += 8;
- return index + 20 * n;
+ return index + hashsz * n;
}
}
@@ -1738,12 +1744,13 @@ void check_pack_index_ptr(const struct packed_git *p, const void *vptr)
off_t nth_packed_object_offset(const struct packed_git *p, uint32_t n)
{
const unsigned char *index = p->index_data;
+ const unsigned int hashsz = the_hash_algo->rawsz;
index += 4 * 256;
if (p->index_version == 1) {
- return ntohl(*((uint32_t *)(index + 24 * n)));
+ return ntohl(*((uint32_t *)(index + (hashsz + 4) * n)));
} else {
uint32_t off;
- index += 8 + p->num_objects * (20 + 4);
+ index += 8 + p->num_objects * (hashsz + 4);
off = ntohl(*((uint32_t *)(index + 4 * n)));
if (!(off & 0x80000000))
return off;
@@ -1814,7 +1821,8 @@ static int fill_pack_entry(const struct object_id *oid,
if (p->num_bad_objects) {
unsigned i;
for (i = 0; i < p->num_bad_objects; i++)
- if (!hashcmp(oid->hash, p->bad_object_sha1 + 20 * i))
+ if (!hashcmp(oid->hash,
+ p->bad_object_sha1 + the_hash_algo->rawsz * i))
return 0;
}
