X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=cache.h;h=efeb82b6dcdca38008bb9ab6d2e1e207fc0aa698;hb=e8871e88adca0637eb0299a41d85400beac928bd;hp=98a32a9ad39883c6d05a000a68511d4b1ee2b3c7;hpb=e83c5163316f89bfbde7d9ab23ca2e25604af290;p=git.git

diff --git a/cache.h b/cache.h
index 98a32a9a..efeb82b6 100644
--- a/cache.h
+++ b/cache.h
@@ -7,8 +7,10 @@
 #include <stddef.h>
 #include <stdlib.h>
 #include <stdarg.h>
+#include <string.h>
 #include <errno.h>
 #include <sys/mman.h>
+#include <netinet/in.h>
 
 #include <openssl/sha.h>
 #include <zlib.h>
@@ -23,9 +25,9 @@
 
 #define CACHE_SIGNATURE 0x44495243	/* "DIRC" */
 struct cache_header {
-	unsigned int signature;
-	unsigned int version;
-	unsigned int entries;
+	unsigned int hdr_signature;
+	unsigned int hdr_version;
+	unsigned int hdr_entries;
 	unsigned char sha1[20];
 };
 
@@ -43,51 +45,84 @@ 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 char name[0];
+	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;
 
 #define DB_ENVIRONMENT "SHA1_FILE_DIRECTORY"
-#define DEFAULT_DB_ENVIRONMENT ".dircache/objects"
-
-#define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7)
-#define ce_size(ce) cache_entry_size((ce)->namelen)
+#define DEFAULT_DB_ENVIRONMENT ".git/objects"
 
 #define alloc_nr(x) (((x)+16)*3/2)
 
-/* Initialize the cache information */
+/* Initialize and use the cache information */
 extern int read_cache(void);
+extern int write_cache(int newfd, struct cache_entry **cache, int entries);
+extern int cache_name_pos(const char *name, int namelen);
+extern int add_cache_entry(struct cache_entry *ce, int ok_to_add);
+extern int remove_file_from_cache(char *path);
+extern int cache_match_stat(struct cache_entry *ce, struct stat *st);
+
+#define MTIME_CHANGED	0x0001
+#define CTIME_CHANGED	0x0002
+#define OWNER_CHANGED	0x0004
+#define MODE_CHANGED    0x0008
+#define INODE_CHANGED   0x0010
+#define DATA_CHANGED    0x0020
 
 /* Return a statically allocated filename matching the sha1 signature */
-extern char *sha1_file_name(unsigned char *sha1);
+extern char *sha1_file_name(const unsigned char *sha1);
 
 /* Write a memory buffer out to the sha file */
-extern int write_sha1_buffer(unsigned char *sha1, void *buf, unsigned int size);
+extern int write_sha1_buffer(const unsigned char *sha1, void *buf, unsigned int size);
 
 /* Read and unpack a sha1 file into memory, write memory to a sha1 file */
-extern void * read_sha1_file(unsigned char *sha1, char *type, unsigned long *size);
-extern int write_sha1_file(char *buf, unsigned len);
+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);
 
 /* Convert to/from hex/sha1 representation */
-extern int get_sha1_hex(char *hex, unsigned char *sha1);
-extern char *sha1_to_hex(unsigned char *sha1);	/* static buffer! */
+extern int get_sha1_hex(const char *hex, unsigned char *sha1);
+extern char *sha1_to_hex(const unsigned char *sha1);	/* static buffer result! */
 
 /* General helper functions */
 extern void usage(const char *err);
+extern void die(const char *err, ...);
+extern int error(const char *err, ...);
+
+extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
 
 #endif /* CACHE_H */