X-Git-Url: https://git.verplant.org/?a=blobdiff_plain;ds=sidebyside;f=cache.h;h=8b226b6cdba331a68b949e47ffcd9bd1a42b851d;hb=cef661fc799a3a13ffdea4a3f69f1acd295de53d;hp=2581117a185fe5cdce38612d82a737ef0636d433;hpb=197ee8c97076ee784db9f4b5a9294e86f42d068c;p=git.git

diff --git a/cache.h b/cache.h
index 2581117a..8b226b6c 100644
--- 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>
@@ -10,8 +11,10 @@
 #include <string.h>
 #include <errno.h>
 #include <sys/mman.h>
+#include <sys/param.h>
+#include <netinet/in.h>
 
-#include <openssl/sha.h>
+#include SHA1_HEADER
 #include <zlib.h>
 
 /*
@@ -24,10 +27,9 @@
 
 #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;
 };
 
 /*
@@ -44,30 +46,51 @@ 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;
 
 #define DB_ENVIRONMENT "SHA1_FILE_DIRECTORY"
-#define DEFAULT_DB_ENVIRONMENT ".dircache/objects"
+#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 get_object_directory() (getenv(DB_ENVIRONMENT) ? : DEFAULT_DB_ENVIRONMENT)
+
+#define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
+#define DEFAULT_INDEX_ENVIRONMENT ".git/index"
+
+#define get_index_file() (getenv(INDEX_ENVIRONMENT) ? : DEFAULT_INDEX_ENVIRONMENT)
 
 #define alloc_nr(x) (((x)+16)*3/2)
 
@@ -75,7 +98,7 @@ unsigned int active_nr, active_alloc;
 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);
+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);
 
@@ -87,17 +110,17 @@ extern int cache_match_stat(struct cache_entry *ce, struct stat *st);
 #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 * map_sha1_file(unsigned char *sha1, unsigned long *size);
+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(unsigned char *sha1, char *type, unsigned long *size);
-extern int write_sha1_file(char *buf, unsigned len);
-extern int check_sha1_signature(unsigned char *sha1, void *buf, 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, const char *type);
 
 /* Convert to/from hex/sha1 representation */
 extern int get_sha1_hex(const char *hex, unsigned char *sha1);
@@ -105,5 +128,13 @@ 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);
+
+extern void *read_tree_with_tree_or_commit_sha1(const unsigned char *sha1,
+						unsigned long *size,
+						unsigned char *tree_sha1_ret);
 
 #endif /* CACHE_H */