index: fix shared prefix computation when writing index entry
When using compressed index entries, each entry's path is preceded by a
varint encoding how long the shared prefix with the previous index entry
actually is. We currently encode a length of `(path_len - same_len)`,
which is doubly wrong. First, `path_len` is already set to `path_len -
same_len` previously. Second, we want to encode the shared prefix rather
than the un-shared suffix length.
Fix this by using `same_len` as the varint value instead.
diff --git a/src/index.c b/src/index.c
index bff5d7f..860adaf 100644
--- a/src/index.c
+++ b/src/index.c
@@ -2661,8 +2661,7 @@
if (last) {
path += git_encode_varint((unsigned char *) path,
- disk_size,
- path_len - same_len);
+ disk_size, same_len);
}
memcpy(path, path_start, path_len);
