Fix up some problems from the commit->tree helper patch

[git.git] / cache.h

diff --git a/cache.h b/cache.h
index 35b26c7..378299a 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -1,6 +1,7 @@
 #ifndef CACHE_H
 #define CACHE_H
 
+#include <unistd.h>
 #include <stdio.h>
 #include <sys/stat.h>
 #include <fcntl.h>
@@ -10,6 +11,7 @@
 #include <string.h>
 #include <errno.h>
 #include <sys/mman.h>
+#include <netinet/in.h>
 
 #include <openssl/sha.h>
 #include <zlib.h>
@@ -24,10 +26,9 @@
 
 #define CACHE_SIGNATURE 0x44495243     /* "DIRC" */
 struct cache_header {
-       unsigned int signature;
-       unsigned int version;
-       unsigned int entries;
-       unsigned char sha1[20];
+       unsigned int hdr_signature;
+       unsigned int hdr_version;
+       unsigned int hdr_entries;
 };
 
 /*
@@ -44,21 +45,38 @@ struct cache_time {
  * dev/ino/uid/gid/size are also just tracked to the low 32 bits
  * Again - this is just a (very strong in practice) heuristic that
  * the inode hasn't changed.
+ *
+ * We save the fields in big-endian order to allow using the
+ * index file over NFS transparently.
  */
 struct cache_entry {
-       struct cache_time ctime;
-       struct cache_time mtime;
-       unsigned int st_dev;
-       unsigned int st_ino;
-       unsigned int st_mode;
-       unsigned int st_uid;
-       unsigned int st_gid;
-       unsigned int st_size;
+       struct cache_time ce_ctime;
+       struct cache_time ce_mtime;
+       unsigned int ce_dev;
+       unsigned int ce_ino;
+       unsigned int ce_mode;
+       unsigned int ce_uid;
+       unsigned int ce_gid;
+       unsigned int ce_size;
        unsigned char sha1[20];
-       unsigned short namelen;
+       unsigned short ce_flags;
        char name[0];
 };
 
+#define CE_NAMEMASK  (0x0fff)
+#define CE_STAGEMASK (0x3000)
+#define CE_STAGESHIFT 12
+
+#define create_ce_flags(len, stage) htons((len) | ((stage) << CE_STAGESHIFT))
+#define ce_namelen(ce) (CE_NAMEMASK & ntohs((ce)->ce_flags))
+#define ce_size(ce) cache_entry_size(ce_namelen(ce))
+#define ce_stage(ce) ((CE_STAGEMASK & ntohs((ce)->ce_flags)) >> CE_STAGESHIFT)
+
+#define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
+#define create_ce_mode(mode) htonl(S_IFREG | ce_permissions(mode))
+
+#define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7)
+
 const char *sha1_file_directory;
 struct cache_entry **active_cache;
 unsigned int active_nr, active_alloc;
@@ -66,9 +84,6 @@ unsigned int active_nr, active_alloc;
 #define DB_ENVIRONMENT "SHA1_FILE_DIRECTORY"
 #define DEFAULT_DB_ENVIRONMENT ".git/objects"
 
-#define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7)
-#define ce_size(ce) cache_entry_size((ce)->namelen)
-
 #define alloc_nr(x) (((x)+16)*3/2)
 
 /* Initialize and use the cache information */
@@ -97,7 +112,7 @@ extern void * map_sha1_file(const unsigned char *sha1, unsigned long *size);
 extern void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size);
 extern void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size);
 extern int write_sha1_file(char *buf, unsigned len, unsigned char *return_sha1);
-extern int check_sha1_signature(unsigned char *sha1, void *buf, unsigned long size);
+extern int check_sha1_signature(unsigned char *sha1, void *buf, unsigned long size, const char *type);
 
 /* Convert to/from hex/sha1 representation */
 extern int get_sha1_hex(const char *hex, unsigned char *sha1);
@@ -110,4 +125,8 @@ extern int error(const char *err, ...);
 
 extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
 
+extern void *read_tree_with_tree_or_commit_sha1(const unsigned char *sha1,
+                                               unsigned long *size,
+                                               unsigned char *tree_sha1_ret);
+
 #endif /* CACHE_H */