object-file: drop OBJECT_INFO_ALLOW_UNKNOWN_TYPE flag

Since cat-file dropped its "--allow-unknown-type" option in the previous
commit, there are no more uses of the internal flag that implemented it.
Let's drop it.

That in turn lets us drop the strbuf parameter of unpack_loose_header(),
which now is always NULL. And without that, we can drop all of the
additional code to inflate larger headers into the strbuf.

Arguably we could drop ULHR_TOO_LONG, as no callers really care about
the distinction from ULHR_BAD. But it's easy enough to retain, and it
does let us produce a slightly more specific message in one instance.

Signed-off-by: Jeff King <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: peff

object-file.c

@@ -299,8 +299,7 @@ enum unpack_loose_header_result unpack_loose_header(git_zstream *stream,
 						    unsigned char *map,
 						    unsigned long mapsize,
 						    void *buffer,
-						    unsigned long bufsiz,
-						    struct strbuf *header)
+						    unsigned long bufsiz)
 {
 	int status;
 
@@ -325,32 +324,9 @@ enum unpack_loose_header_result unpack_loose_header(git_zstream *stream,
 		return ULHR_OK;
 
 	/*
-	 * We have a header longer than MAX_HEADER_LEN. The "header"
-	 * here is only non-NULL when we run "cat-file
-	 * --allow-unknown-type".
+	 * We have a header longer than MAX_HEADER_LEN.
 	 */
-	if (!header)
-		return ULHR_TOO_LONG;
-
-	/*
-	 * buffer[0..bufsiz] was not large enough.  Copy the partial
-	 * result out to header, and then append the result of further
-	 * reading the stream.
-	 */
-	strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer);
-
-	do {
-		stream->next_out = buffer;
-		stream->avail_out = bufsiz;
-
-		obj_read_unlock();
-		status = git_inflate(stream, 0);
-		obj_read_lock();
-		strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer);
-		if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer))
-			return 0;
-	} while (status == Z_OK);
-	return ULHR_BAD;
+	return ULHR_TOO_LONG;
 }
 
 static void *unpack_loose_rest(git_zstream *stream,
@@ -476,10 +452,8 @@ int loose_object_info(struct repository *r,
 	void *map;
 	git_zstream stream;
 	char hdr[MAX_HEADER_LEN];
-	struct strbuf hdrbuf = STRBUF_INIT;
 	unsigned long size_scratch;
 	enum object_type type_scratch;
-	int allow_unknown = flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE;
 
 	if (oi->delta_base_oid)
 		oidclr(oi->delta_base_oid, the_repository->hash_algo);
@@ -521,18 +495,15 @@ int loose_object_info(struct repository *r,
 	if (oi->disk_sizep)
 		*oi->disk_sizep = mapsize;
 
-	switch (unpack_loose_header(&stream, map, mapsize, hdr, sizeof(hdr),
-				    allow_unknown ? &hdrbuf : NULL)) {
+	switch (unpack_loose_header(&stream, map, mapsize, hdr, sizeof(hdr))) {
 	case ULHR_OK:
-		if (parse_loose_header(hdrbuf.len ? hdrbuf.buf : hdr, oi) < 0)
+		if (parse_loose_header(hdr, oi) < 0)
 			status = error(_("unable to parse %s header"), oid_to_hex(oid));
-		else if (!allow_unknown && *oi->typep < 0)
+		else if (*oi->typep < 0)
 			die(_("invalid object type"));
 
 		if (!oi->contentp)
 			break;
-		if (hdrbuf.len)
-			BUG("unpacking content with unknown types not yet supported");
 		*oi->contentp = unpack_loose_rest(&stream, hdr, *oi->sizep, oid);
 		if (*oi->contentp)
 			goto cleanup;
@@ -558,7 +529,6 @@ int loose_object_info(struct repository *r,
 	munmap(map, mapsize);
 	if (oi->sizep == &size_scratch)
 		oi->sizep = NULL;
-	strbuf_release(&hdrbuf);
 	if (oi->typep == &type_scratch)
 		oi->typep = NULL;
 	oi->whence = OI_LOOSE;
@@ -1682,8 +1652,7 @@ int read_loose_object(const char *path,
 		goto out;
 	}
 
-	if (unpack_loose_header(&stream, map, mapsize, hdr, sizeof(hdr),
-				NULL) != ULHR_OK) {
+	if (unpack_loose_header(&stream, map, mapsize, hdr, sizeof(hdr)) != ULHR_OK) {
 		error(_("unable to unpack header of %s"), path);
 		goto out_inflate;
 	}

object-file.h

@@ -133,12 +133,7 @@ int format_object_header(char *str, size_t size, enum object_type type,
  * - ULHR_BAD on error
  * - ULHR_TOO_LONG if the header was too long
  *
- * It will only parse up to MAX_HEADER_LEN bytes unless an optional
- * "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.
+ * It will only parse up to MAX_HEADER_LEN bytes.
  */
 enum unpack_loose_header_result {
 	ULHR_OK,
@@ -149,8 +144,7 @@ enum unpack_loose_header_result unpack_loose_header(git_zstream *stream,
 						    unsigned char *map,
 						    unsigned long mapsize,
 						    void *buffer,
-						    unsigned long bufsiz,
-						    struct strbuf *hdrbuf);
+						    unsigned long bufsiz);
 
 /**
  * parse_loose_header() parses the starting "<type> <len>\0" of an

object-store.h

@@ -240,8 +240,6 @@ struct object_info {
 
 /* Invoke lookup_replace_object() on the given hash */
 #define OBJECT_INFO_LOOKUP_REPLACE 1
-/* Allow reading from a loose object file of unknown/bogus type */
-#define OBJECT_INFO_ALLOW_UNKNOWN_TYPE 2
 /* Do not retry packed storage after checking packed and loose storage */
 #define OBJECT_INFO_QUICK 8
 /*

streaming.c

@@ -238,7 +238,7 @@ static int open_istream_loose(struct git_istream *st, struct repository *r,
 		return -1;
 	switch (unpack_loose_header(&st->z, st->u.loose.mapped,
 				    st->u.loose.mapsize, st->u.loose.hdr,
-				    sizeof(st->u.loose.hdr), NULL)) {
+				    sizeof(st->u.loose.hdr))) {
 	case ULHR_OK:
 		break;
 	case ULHR_BAD: