Decouple storage from ODB logic

Comes with two default backends: loose object and packfiles.

Signed-off-by: Vicent Marti <tanoku@gmail.com>

1 files changed, 44 insertions, 17 deletions

diff --git a/src/odb.h b/src/odb.h
index a45b803b8..2726cbb46 100644
--- a/src/odb.h
+++ b/src/odb.h
@@ -1,22 +1,49 @@
 #ifndef INCLUDE_odb_h__
 #define INCLUDE_odb_h__
 
-/** First 4 bytes of a pack-*.idx file header.
- *
- * Note this header exists only in idx v2 and later.  The idx v1
- * file format does not have a magic sequence at the front, and
- * must be detected by the first four bytes *not* being this value
- * and the first 8 bytes matching the following expression:
- *
- *   uint32_t *fanout = ... the file data at offset 0 ...
- *   ntohl(fanout[0]) < ntohl(fanout[1])
- *
- * The value chosen here for PACK_TOC is such that the above
- * cannot be true for an idx v1 file.
- */
-#define PACK_TOC 0xff744f63 /* -1tOc */
-
-/** First 4 bytes of a pack-*.pack file header. */
-#define PACK_SIG 0x5041434b /* PACK */
+#include <git/odb.h>
+#include <git/oid.h>
+
+#include "vector.h"
+
+struct git_odb {
+	void *_internal;
+	git_vector backends;
+};
+
+struct git_odb_backend {
+	git_odb *odb;
+
+	int priority;
+
+	int (* read)(
+			git_rawobj *,
+			struct git_odb_backend *,
+			const git_oid *);
+
+	int (* read_header)(
+			git_rawobj *,
+			struct git_odb_backend *,
+			const git_oid *);
+
+	int (* write)(
+			git_oid *id,
+			struct git_odb_backend *,
+			git_rawobj *obj);
+
+	int (* exists)(
+			struct git_odb_backend *,
+			const git_oid *);
+
+	void (* free)(struct git_odb_backend *);
+
+};
+
+int git_odb__hash_obj(git_oid *id, char *hdr, size_t n, int *len, git_rawobj *obj);
+int git_odb__inflate_buffer(void *in, size_t inlen, void *out, size_t outlen);
+
+
+int git_odb_backend_loose(git_odb_backend **backend_out, const char *objects_dir);
+int git_odb_backend_pack(git_odb_backend **backend_out, const char *objects_dir);
 
 #endif