[PATCH 1/6] move pack creation to version 3

[Nicolas Pitre <nico@cam.org>]

It's been quite a while now that GIT is able to read version 3 packs.
Let's create them at last.

Signed-off-by: Nicolas Pitre <nico@cam.org>

diff --git a/diff-delta.c b/diff-delta.c
index fa16d06..51df460 100644
--- a/diff-delta.c
+++ b/diff-delta.c
@@ -308,8 +308,8 @@ create_delta(const struct delta_index *i
 				continue;
 			if (ref_size > top - src)
 				ref_size = top - src;
-			if (ref_size > 0x10000)
-				ref_size = 0x10000;
+			if (ref_size > 0xffffff)
+				ref_size = 0xffffff;
 			if (ref_size <= msize)
 				break;
 			while (ref_size-- && *src++ == *ref)
@@ -318,6 +318,8 @@ create_delta(const struct delta_index *i
 				/* this is our best match so far */
 				msize = ref - entry->ptr;
 				moff = entry->ptr - ref_data;
+				if (msize >= 0x10000)
+					break;  /* this is good enough */
 			}
 		}
 
@@ -381,6 +383,8 @@ create_delta(const struct delta_index *i
 			if (msize & 0xff) { out[outpos++] = msize; i |= 0x10; }
 			msize >>= 8;
 			if (msize & 0xff) { out[outpos++] = msize; i |= 0x20; }
+			msize >>= 8;
+			if (msize & 0xff) { out[outpos++] = msize; i |= 0x40; }
 
 			*op = i;
 		}
diff --git a/pack.h b/pack.h
index eb07b03..05557da 100644
--- a/pack.h
+++ b/pack.h
@@ -7,7 +7,7 @@ #include "object.h"
  * Packed object header
  */
 #define PACK_SIGNATURE 0x5041434b	/* "PACK" */
-#define PACK_VERSION 2
+#define PACK_VERSION 3
 #define pack_version_ok(v) ((v) == htonl(2) || (v) == htonl(3))
 struct pack_header {
 	unsigned int hdr_signature;