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authorJunio C Hamano <junkio@cox.net>2006-04-25 04:18:58 (GMT)
committerJunio C Hamano <junkio@cox.net>2006-04-25 04:24:13 (GMT)
commitbad68ec92410cf47dd001aa9b95d0f24c5f4bf77 (patch)
tree9c3ef1388867852e706dbf9a4ba9cc6a8ec15bfe /cache-tree.c
parentdd0c34c46bdda0c20fd92d00516e711a4c9f7837 (diff)
downloadgit-bad68ec92410cf47dd001aa9b95d0f24c5f4bf77.zip
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index: make the index file format extensible.
... and move the cache-tree data into it. Signed-off-by: Junio C Hamano <junkio@cox.net>
Diffstat (limited to 'cache-tree.c')
-rw-r--r--cache-tree.c108
1 files changed, 26 insertions, 82 deletions
diff --git a/cache-tree.c b/cache-tree.c
index b34b0bc..2146723 100644
--- a/cache-tree.c
+++ b/cache-tree.c
@@ -11,16 +11,18 @@ struct cache_tree *cache_tree(void)
return it;
}
-void cache_tree_free(struct cache_tree *it)
+void cache_tree_free(struct cache_tree **it_p)
{
int i;
+ struct cache_tree *it = *it_p;
if (!it)
return;
for (i = 0; i < it->subtree_nr; i++)
- cache_tree_free(it->down[i]->cache_tree);
+ cache_tree_free(&it->down[i]->cache_tree);
free(it->down);
free(it);
+ *it_p = NULL;
}
static struct cache_tree_sub *find_subtree(struct cache_tree *it,
@@ -78,7 +80,7 @@ void cache_tree_invalidate_path(struct cache_tree *it, const char *path)
break;
}
if (i < it->subtree_nr) {
- cache_tree_free(it->down[i]->cache_tree);
+ cache_tree_free(&it->down[i]->cache_tree);
free(it->down[i]);
/* 0 1 2 3 4 5
* ^ ^subtree_nr = 6
@@ -159,13 +161,27 @@ static void discard_unused_subtrees(struct cache_tree *it)
if (s->used)
down[dst++] = s;
else {
- cache_tree_free(s->cache_tree);
+ cache_tree_free(&s->cache_tree);
free(s);
it->subtree_nr--;
}
}
}
+int cache_tree_fully_valid(struct cache_tree *it)
+{
+ int i;
+ if (!it)
+ return 0;
+ if (it->entry_count < 0 || !has_sha1_file(it->sha1))
+ return 0;
+ for (i = 0; i < it->subtree_nr; i++) {
+ if (!cache_tree_fully_valid(it->down[i]->cache_tree))
+ return 0;
+ }
+ return 1;
+}
+
static int update_one(struct cache_tree *it,
struct cache_entry **cache,
int entries,
@@ -354,19 +370,15 @@ static void *write_one(struct cache_tree *it,
return buffer;
}
-static void *cache_tree_write(const unsigned char *cache_sha1,
- struct cache_tree *root,
- unsigned long *offset_p)
+void *cache_tree_write(struct cache_tree *root, unsigned long *size_p)
{
char path[PATH_MAX];
unsigned long size = 8192;
char *buffer = xmalloc(size);
- /* the cache checksum of the corresponding index file. */
- memcpy(buffer, cache_sha1, 20);
- *offset_p = 20;
+ *size_p = 0;
path[0] = 0;
- return write_one(root, path, 0, buffer, &size, offset_p);
+ return write_one(root, path, 0, buffer, &size, size_p);
}
static struct cache_tree *read_one(const char **buffer, unsigned long *size_p)
@@ -439,81 +451,13 @@ static struct cache_tree *read_one(const char **buffer, unsigned long *size_p)
return it;
free_return:
- cache_tree_free(it);
+ cache_tree_free(&it);
return NULL;
}
-static struct cache_tree *cache_tree_read(unsigned char *sha1,
- const char *buffer,
- unsigned long size)
+struct cache_tree *cache_tree_read(const char *buffer, unsigned long size)
{
- /* check the cache-tree matches the index */
- if (memcmp(buffer, sha1, 20))
- return NULL; /* checksum mismatch */
- if (buffer[20])
+ if (buffer[0])
return NULL; /* not the whole tree */
- buffer += 20;
- size -= 20;
return read_one(&buffer, &size);
}
-
-struct cache_tree *read_cache_tree(unsigned char *sha1)
-{
- int fd;
- struct stat st;
- char path[PATH_MAX];
- unsigned long size = 0;
- void *map;
- struct cache_tree *it;
-
- sprintf(path, "%s.aux", get_index_file());
- fd = open(path, O_RDONLY);
- if (fd < 0)
- return cache_tree();
-
- if (fstat(fd, &st))
- return cache_tree();
- size = st.st_size;
- map = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
- close(fd);
- if (map == MAP_FAILED)
- return cache_tree();
- it = cache_tree_read(sha1, map, size);
- munmap(map, size);
- if (!it)
- return cache_tree();
- return it;
-}
-
-int write_cache_tree(const unsigned char *sha1, struct cache_tree *root)
-{
- char path[PATH_MAX];
- unsigned long size = 0;
- void *buf, *buffer;
- int fd, ret = -1;
-
- sprintf(path, "%s.aux", get_index_file());
- if (!root) {
- unlink(path);
- return -1;
- }
- fd = open(path, O_WRONLY|O_CREAT, 0666);
- if (fd < 0)
- return -1;
- buffer = buf = cache_tree_write(sha1, root, &size);
- while (size) {
- int written = xwrite(fd, buf, size);
- if (written <= 0)
- goto fail;
- buf += written;
- size -= written;
- }
- ret = 0;
-
- fail:
- close(fd);
- free(buffer);
- if (ret)
- unlink(path);
- return ret;
-}