[RFC PATCH 1/2] object-file API: fix obscure unpack_loose_header() return

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

Fix an obscure unpack_loose_header() return value. In my
5848fb11acd (object-file.c: return ULHR_TOO_LONG on "header too long",
2021-10-01) this API learned to return ULHR_TOO_LONG, but should not
have done so in the case of parsing a long header where the
terminating \0 cannot be found. We should return a ULHR_BAD in that
case.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 cache.h       | 3 +--
 object-file.c | 2 +-
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/cache.h b/cache.h
index 595582becc8..aa24d5a609f 100644
--- a/cache.h
+++ b/cache.h
@@ -1342,8 +1342,7 @@ int git_open_cloexec(const char *name, int flags);
  * "hdrbuf" argument is non-NULL. This is intended for use with
  * OBJECT_INFO_ALLOW_UNKNOWN_TYPE to extract the bad type for (error)
  * reporting. The full header will be extracted to "hdrbuf" for use
- * with parse_loose_header(), ULHR_TOO_LONG will still be returned
- * from this function to indicate that the header was too long.
+ * with parse_loose_header().
  */
 enum unpack_loose_header_result {
 	ULHR_OK,
diff --git a/object-file.c b/object-file.c
index b5d1d12b68a..1babe9791f6 100644
--- a/object-file.c
+++ b/object-file.c
@@ -1301,7 +1301,7 @@ enum unpack_loose_header_result unpack_loose_header(git_zstream *stream,
 		stream->next_out = buffer;
 		stream->avail_out = bufsiz;
 	} while (status != Z_STREAM_END);
-	return ULHR_TOO_LONG;
+	return ULHR_BAD;
 }
 
 static void *unpack_loose_rest(git_zstream *stream,
-- 
2.36.1.957.g2c13267e09b