The name dictionary is loaded if not already done. We know it is
located right after the SHA1 table (20 bytes per object) which is
itself right after the 12-byte header.
Then the index is parsed from the input buffer and a pointer to the
corresponding entry is returned.
Signed-off-by: Nicolas Pitre <nico@xxxxxxxxxxx>
---
cache.h | 3 +++
packv4-parse.c | 24 ++++++++++++++++++++++++
2 files changed, 27 insertions(+)
diff --git a/cache.h b/cache.h
index 59d9ba7..6ce327e 100644
--- a/cache.h
+++ b/cache.h
@@ -1015,6 +1015,8 @@ struct pack_window {
unsigned int inuse_cnt;
};
+struct packv4_dict;
+
extern struct packed_git {
struct packed_git *next;
struct pack_window *windows;
@@ -1027,6 +1029,7 @@ extern struct packed_git {
unsigned char *bad_object_sha1;
int version;
int index_version;
+ struct packv4_dict *name_dict;
time_t mtime;
int pack_fd;
unsigned pack_local:1,
diff --git a/packv4-parse.c b/packv4-parse.c
index 26894bc..074e107 100644
--- a/packv4-parse.c
+++ b/packv4-parse.c
@@ -105,3 +105,27 @@ static struct packv4_dict *load_dict(struct packed_git *p, off_t *offset)
*offset = curpos;
return dict;
}
+
+static void load_name_dict(struct packed_git *p)
+{
+ off_t offset = 12 + p->num_objects * 20;
+ struct packv4_dict *names = load_dict(p, &offset);
+ if (!names)
+ die("bad pack name dictionary in %s", p->pack_name);
+ p->name_dict = names;
+}
+
+const unsigned char *get_nameref(struct packed_git *p, const unsigned char **srcp)
+{
+ unsigned int index;
+
+ if (!p->name_dict)
+ load_name_dict(p);
+
+ index = decode_varint(srcp);
+ if (index >= p->name_dict->nb_entries) {
+ error("%s: index overflow", __func__);
+ return NULL;
+ }
+ return p->name_dict->data + p->name_dict->offsets[index];
+}
--
1.8.4.38.g317e65b
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