Merge branch 'master' into sp/gfi

git-fast-import requires use of inttypes.h, but the master branch has
added it to git-compat-util differently than git-fast-import originally
had used it.  This merge back of master to the fast-import topic is to
get (and use) inttypes.h the way master is using it.

This is a partially evil merge to remove the call to setup_ident(),
as the master branch now contains a change which makes this implicit
and therefore removed the function declaration. (commit 01754769).

Conflicts:

	git-compat-util.h

1 files changed, 36 insertions, 3 deletions

diff --git a/pack.h b/pack.h
index 4814800f28..deb427edbe 100644
--- a/pack.h
+++ b/pack.h
@@ -10,10 +10,43 @@
 #define PACK_VERSION 2
 #define pack_version_ok(v) ((v) == htonl(2) || (v) == htonl(3))
 struct pack_header {
-	unsigned int hdr_signature;
-	unsigned int hdr_version;
-	unsigned int hdr_entries;
+	uint32_t hdr_signature;
+	uint32_t hdr_version;
+	uint32_t hdr_entries;
 };
 
+/*
+ * Packed object index header
+ *
+ * struct pack_idx_header {
+ * 	uint32_t idx_signature;
+ *	uint32_t idx_version;
+ * };
+ *
+ * Note: this header isn't active yet.  In future versions of git
+ * we may change the index file format.  At that time we would start
+ * the first four bytes of the new index format with this signature,
+ * as all older git binaries would find this value illegal and abort
+ * reading the file.
+ *
+ * This is the case because the number of objects in a packfile
+ * cannot exceed 1,431,660,000 as every object would need at least
+ * 3 bytes of data and the overall packfile cannot exceed 4 GiB due
+ * to the 32 bit offsets used by the index.  Clearly the signature
+ * exceeds this maximum.
+ *
+ * Very old git binaries will also compare the first 4 bytes to the
+ * next 4 bytes in the index and abort with a "non-monotonic index"
+ * error if the second 4 byte word is smaller than the first 4
+ * byte word.  This would be true in the proposed future index
+ * format as idx_signature would be greater than idx_version.
+ */
+#define PACK_IDX_SIGNATURE 0xff744f63	/* "\377tOc" */
+
 extern int verify_pack(struct packed_git *, int);
+
+#define PH_ERROR_EOF		(-1)
+#define PH_ERROR_PACK_SIGNATURE	(-2)
+#define PH_ERROR_PROTOCOL	(-3)
+extern int read_pack_header(int fd, struct pack_header *);
 #endif