scan reflogs independently from refs

diff --git a/sha1_file.c b/sha1_file.c
index 43ff4023808cc8b5a5f54c75ff77e80776a581aa..498665e50c1a5053e29a80c37ad95b800bb0f86d 100644 (file)
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -2048,3 +2048,24 @@ int index_path(unsigned char *sha1, const char *path, struct stat *st, int write
        }
        return 0;
 }
+
+int read_pack_header(int fd, struct pack_header *header)
+{
+       char *c = (char*)header;
+       ssize_t remaining = sizeof(struct pack_header);
+       do {
+               ssize_t r = xread(fd, c, remaining);
+               if (r <= 0)
+                       /* "eof before pack header was fully read" */
+                       return PH_ERROR_EOF;
+               remaining -= r;
+               c += r;
+       } while (remaining > 0);
+       if (header->hdr_signature != htonl(PACK_SIGNATURE))
+               /* "protocol error (pack signature mismatch detected)" */
+               return PH_ERROR_PACK_SIGNATURE;
+       if (!pack_version_ok(header->hdr_version))
+               /* "protocol error (pack version unsupported)" */
+               return PH_ERROR_PROTOCOL;
+       return 0;
+}