Signed-off-by: Nicolas Pitre <nico@xxxxxxxxxxx>
---
packv4-parse.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 77 insertions(+)
diff --git a/packv4-parse.c b/packv4-parse.c
index 299fc48..26894bc 100644
--- a/packv4-parse.c
+++ b/packv4-parse.c
@@ -28,3 +28,80 @@ const unsigned char *get_sha1ref(struct packed_git *p,
return sha1;
}
+
+struct packv4_dict {
+ const unsigned char *data;
+ unsigned int nb_entries;
+ unsigned int offsets[FLEX_ARRAY];
+};
+
+static struct packv4_dict *load_dict(struct packed_git *p, off_t *offset)
+{
+ struct pack_window *w_curs = NULL;
+ off_t curpos = *offset;
+ unsigned long dict_size, avail;
+ unsigned char *src, *data;
+ const unsigned char *cp;
+ git_zstream stream;
+ struct packv4_dict *dict;
+ int nb_entries, i, st;
+
+ /* get uncompressed dictionary data size */
+ src = use_pack(p, &w_curs, curpos, &avail);
+ cp = src;
+ dict_size = decode_varint(&cp);
+ if (dict_size < 3) {
+ error("bad dict size");
+ return NULL;
+ }
+ curpos += cp - src;
+
+ data = xmallocz(dict_size);
+ memset(&stream, 0, sizeof(stream));
+ stream.next_out = data;
+ stream.avail_out = dict_size + 1;
+
+ git_inflate_init(&stream);
+ do {
+ src = use_pack(p, &w_curs, curpos, &stream.avail_in);
+ stream.next_in = src;
+ st = git_inflate(&stream, Z_FINISH);
+ curpos += stream.next_in - src;
+ } while ((st == Z_OK || st == Z_BUF_ERROR) && stream.avail_out);
+ git_inflate_end(&stream);
+ unuse_pack(&w_curs);
+ if (st != Z_STREAM_END || stream.total_out != dict_size) {
+ error("pack dictionary bad");
+ free(data);
+ return NULL;
+ }
+
+ /* count number of entries */
+ nb_entries = 0;
+ cp = data;
+ while (cp < data + dict_size - 3) {
+ cp += 2; /* prefix bytes */
+ cp += strlen((const char *)cp); /* entry string */
+ cp += 1; /* terminating NUL */
+ nb_entries++;
+ }
+ if (cp - data != dict_size) {
+ error("dict size mismatch");
+ free(data);
+ return NULL;
+ }
+
+ dict = xmalloc(sizeof(*dict) + nb_entries * sizeof(dict->offsets[0]));
+ dict->data = data;
+ dict->nb_entries = nb_entries;
+
+ cp = data;
+ for (i = 0; i < nb_entries; i++) {
+ dict->offsets[i] = cp - data;
+ cp += 2;
+ cp += strlen((const char *)cp) + 1;
+ }
+
+ *offset = curpos;
+ return dict;
+}
--
1.8.4.38.g317e65b
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