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authorJunio C Hamano <junkio@cox.net>2006-07-17 15:04:47 -0700
committerJunio C Hamano <junkio@cox.net>2006-07-25 14:15:48 -0700
commitbb6b8e4f877e8b59b3756960e29d1955072dab56 (patch)
treeec8e3f2c7a91fd3b456ae046b92dbc5f5c1ac28a
parent96256bba949f43548a0be0af877680eb62b156f6 (diff)
downloadgit-bb6b8e4f877e8b59b3756960e29d1955072dab56.tar.gz
git-bb6b8e4f877e8b59b3756960e29d1955072dab56.tar.xz
sha1_file.c: expose map_sha1_file() interface.
This exposes map_sha1_file() interface to mmap a loose object file, and legacy_loose_object() function, split from unpack_sha1_header(). They will be used in the next patch to reuse the deflated data from new-style loose object files when generating packs. Signed-off-by: Junio C Hamano <junkio@cox.net>
-rw-r--r--cache.h2
-rw-r--r--sha1_file.c35
2 files changed, 24 insertions, 13 deletions
diff --git a/cache.h b/cache.h
index eee5fc9f8..01835ef43 100644
--- a/cache.h
+++ b/cache.h
@@ -240,6 +240,8 @@ extern int move_temp_to_file(const char *tmpfile, char *filename);
extern int has_sha1_pack(const unsigned char *sha1);
extern int has_sha1_file(const unsigned char *sha1);
+extern void *map_sha1_file(const unsigned char *sha1, unsigned long *);
+extern int legacy_loose_object(unsigned char *);
extern int has_pack_file(const unsigned char *sha1);
extern int has_pack_index(const unsigned char *sha1);
diff --git a/sha1_file.c b/sha1_file.c
index 43bc2ea0c..51e07d5a4 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -646,8 +646,7 @@ int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long siz
return memcmp(sha1, real_sha1, 20) ? -1 : 0;
}
-static void *map_sha1_file_internal(const unsigned char *sha1,
- unsigned long *size)
+void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
{
struct stat st;
void *map;
@@ -684,10 +683,26 @@ static void *map_sha1_file_internal(const unsigned char *sha1,
return map;
}
+int legacy_loose_object(unsigned char *map)
+{
+ unsigned int word;
+
+ /*
+ * Is it a zlib-compressed buffer? If so, the first byte
+ * must be 0x78 (15-bit window size, deflated), and the
+ * first 16-bit word is evenly divisible by 31
+ */
+ word = (map[0] << 8) + map[1];
+ if (map[0] == 0x78 && !(word % 31))
+ return 1;
+ else
+ return 0;
+}
+
static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz)
{
unsigned char c;
- unsigned int word, bits;
+ unsigned int bits;
unsigned long size;
static const char *typename[8] = {
NULL, /* OBJ_EXT */
@@ -703,13 +718,7 @@ static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned lon
stream->next_out = buffer;
stream->avail_out = bufsiz;
- /*
- * Is it a zlib-compressed buffer? If so, the first byte
- * must be 0x78 (15-bit window size, deflated), and the
- * first 16-bit word is evenly divisible by 31
- */
- word = (map[0] << 8) + map[1];
- if (map[0] == 0x78 && !(word % 31)) {
+ if (legacy_loose_object(map)) {
inflateInit(stream);
return inflate(stream, 0);
}
@@ -1246,7 +1255,7 @@ int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep
z_stream stream;
char hdr[128];
- map = map_sha1_file_internal(sha1, &mapsize);
+ map = map_sha1_file(sha1, &mapsize);
if (!map) {
struct pack_entry e;
@@ -1291,7 +1300,7 @@ void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size
if (find_pack_entry(sha1, &e))
return read_packed_sha1(sha1, type, size);
- map = map_sha1_file_internal(sha1, &mapsize);
+ map = map_sha1_file(sha1, &mapsize);
if (map) {
buf = unpack_sha1_file(map, mapsize, type, size);
munmap(map, mapsize);
@@ -1629,7 +1638,7 @@ int write_sha1_to_fd(int fd, const unsigned char *sha1)
{
int retval;
unsigned long objsize;
- void *buf = map_sha1_file_internal(sha1, &objsize);
+ void *buf = map_sha1_file(sha1, &objsize);
if (buf) {
retval = write_buffer(fd, buf, objsize);