Document 'opendiff' value in config.txt and git-mergetool.txt

diff --git a/pack.h b/pack.h
index 790ff4a39681402d6b6e2517e5fcf1bec59bcdc5..d4d412ccbb403f1374d41a00791eec3c16ba64ef 100644 (file)
--- a/pack.h
+++ b/pack.h
@@ -10,30 +10,21 @@
 #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.
+ * The first four bytes of index formats later than version 1 should
+ * start 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.
+ * 3 bytes of data and the overall packfile cannot exceed 4 GiB with
+ * version 1 of the index file due to the offsets limited to 32 bits.
+ * 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"
@@ -43,5 +34,19 @@ struct pack_header {
  */
 #define PACK_IDX_SIGNATURE 0xff744f63  /* "\377tOc" */
 
+/*
+ * Packed object index header
+ */
+struct pack_idx_header {
+       uint32_t idx_signature;
+       uint32_t idx_version;
+};
+
+
 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