Don't smash stack when $GIT_ALTERNATE_OBJECT_DIRECTORIES is too long

[git.git] / pack.h

diff --git a/pack.h b/pack.h
index deb427edbe43710dd2b76a3af0dbd87750344103..d667fb8d5a49b4480beaa6f384f1f6f86b035806 100644 (file)
--- a/pack.h
+++ b/pack.h
@@ -16,24 +16,15 @@ struct pack_header {
 };
 
 /*
- * 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"
@@ -43,7 +34,17 @@ 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);
+extern void fixup_pack_header_footer(int, unsigned char *, const char *, uint32_t);
 
 #define PH_ERROR_EOF           (-1)
 #define PH_ERROR_PACK_SIGNATURE        (-2)