X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=read-cache.c;h=54536944648c166008f06d29f65314b58b0c3988;hb=e2e5e98a40d6ed04b7acf791cc2243ff32923db3;hp=60a0b5b2e78f403047f3a5e2cac1c5c7965091a1;hpb=19b2860cba5742ab31fd682b80fefefac19be141;p=git.git

diff --git a/read-cache.c b/read-cache.c
index 60a0b5b2..54536944 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -9,9 +9,15 @@ const char *sha1_file_directory = NULL;
 struct cache_entry **active_cache = NULL;
 unsigned int active_nr = 0, active_alloc = 0;
 
-void usage(const char *err)
+void usage(const char *err, ...)
 {
-	fprintf(stderr, "read-tree: %s\n", err);
+	va_list args;
+	char string[200];
+
+	va_start(args, err);
+	vsnprintf(string, sizeof(string), err, args);
+	va_end(args);
+	fprintf(stderr, "%s\n", string);
 	exit(1);
 }
 
@@ -26,7 +32,7 @@ static unsigned hexval(char c)
 	return ~0;
 }
 
-int get_sha1_hex(char *hex, unsigned char *sha1)
+int get_sha1_hex(const char *hex, unsigned char *sha1)
 {
 	int i;
 	for (i = 0; i < 20; i++) {
@@ -39,7 +45,7 @@ int get_sha1_hex(char *hex, unsigned char *sha1)
 	return 0;
 }
 
-char * sha1_to_hex(unsigned char *sha1)
+char * sha1_to_hex(const unsigned char *sha1)
 {
 	static char buffer[50];
 	static const char hex[] = "0123456789abcdef";
@@ -59,7 +65,7 @@ char * sha1_to_hex(unsigned char *sha1)
  * careful about using it. Do a "strdup()" if you need to save the
  * filename.
  */
-char *sha1_file_name(unsigned char *sha1)
+char *sha1_file_name(const unsigned char *sha1)
 {
 	int i;
 	static char *name, *base;
@@ -84,33 +90,51 @@ char *sha1_file_name(unsigned char *sha1)
 	return base;
 }
 
-void * read_sha1_file(unsigned char *sha1, char *type, unsigned long *size)
+int check_sha1_signature(unsigned char *sha1, void *map, unsigned long size)
+{
+	unsigned char real_sha1[20];
+	SHA_CTX c;
+
+	SHA1_Init(&c);
+	SHA1_Update(&c, map, size);
+	SHA1_Final(real_sha1, &c);
+	return memcmp(sha1, real_sha1, 20) ? -1 : 0;
+}
+
+void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
 {
-	z_stream stream;
-	char buffer[8192];
-	struct stat st;
-	int fd, ret, bytes;
-	void *map, *buf;
 	char *filename = sha1_file_name(sha1);
+	int fd = open(filename, O_RDONLY);
+	struct stat st;
+	void *map;
 
-	fd = open(filename, O_RDONLY);
 	if (fd < 0) {
 		perror(filename);
 		return NULL;
 	}
 	if (fstat(fd, &st) < 0) {
-		close(fd);
+		close(fd);  
 		return NULL;
 	}
 	map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
 	close(fd);
 	if (-1 == (int)(long)map)
 		return NULL;
+	*size = st.st_size;
+	return map;
+}
+
+void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size)
+{
+	int ret, bytes;
+	z_stream stream;
+	char buffer[8192];
+	char *buf;
 
 	/* Get the data stream */
 	memset(&stream, 0, sizeof(stream));
 	stream.next_in = map;
-	stream.avail_in = st.st_size;
+	stream.avail_in = mapsize;
 	stream.next_out = buffer;
 	stream.avail_out = sizeof(buffer);
 
@@ -118,6 +142,7 @@ void * read_sha1_file(unsigned char *sha1, char *type, unsigned long *size)
 	ret = inflate(&stream, 0);
 	if (sscanf(buffer, "%10s %lu", type, size) != 2)
 		return NULL;
+
 	bytes = strlen(buffer) + 1;
 	buf = malloc(*size);
 	if (!buf)
@@ -135,7 +160,21 @@ void * read_sha1_file(unsigned char *sha1, char *type, unsigned long *size)
 	return buf;
 }
 
-int write_sha1_file(char *buf, unsigned len)
+void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size)
+{
+	unsigned long mapsize;
+	void *map, *buf;
+
+	map = map_sha1_file(sha1, &mapsize);
+	if (map) {
+		buf = unpack_sha1_file(map, mapsize, type, size);
+		munmap(map, mapsize);
+		return buf;
+	}
+	return NULL;
+}
+
+int write_sha1_file(char *buf, unsigned len, unsigned char *returnsha1)
 {
 	int size;
 	char *compressed;
@@ -166,11 +205,12 @@ int write_sha1_file(char *buf, unsigned len)
 
 	if (write_sha1_buffer(sha1, compressed, size) < 0)
 		return -1;
-	printf("%s\n", sha1_to_hex(sha1));
+	if (returnsha1)
+		memcpy(returnsha1, sha1, 20);
 	return 0;
 }
 
-int write_sha1_buffer(unsigned char *sha1, void *buf, unsigned int size)
+int write_sha1_buffer(const unsigned char *sha1, void *buf, unsigned int size)
 {
 	char *filename = sha1_file_name(sha1);
 	int fd;
@@ -189,6 +229,106 @@ static int error(const char * string)
 	return -1;
 }
 
+int cache_match_stat(struct cache_entry *ce, struct stat *st)
+{
+	unsigned int changed = 0;
+
+	if (ce->mtime.sec  != (unsigned int)st->st_mtim.tv_sec ||
+	    ce->mtime.nsec != (unsigned int)st->st_mtim.tv_nsec)
+		changed |= MTIME_CHANGED;
+	if (ce->ctime.sec  != (unsigned int)st->st_ctim.tv_sec ||
+	    ce->ctime.nsec != (unsigned int)st->st_ctim.tv_nsec)
+		changed |= CTIME_CHANGED;
+	if (ce->st_uid != (unsigned int)st->st_uid ||
+	    ce->st_gid != (unsigned int)st->st_gid)
+		changed |= OWNER_CHANGED;
+	if (ce->st_mode != (unsigned int)st->st_mode)
+		changed |= MODE_CHANGED;
+	if (ce->st_dev != (unsigned int)st->st_dev ||
+	    ce->st_ino != (unsigned int)st->st_ino)
+		changed |= INODE_CHANGED;
+	if (ce->st_size != (unsigned int)st->st_size)
+		changed |= DATA_CHANGED;
+	return changed;
+}
+
+int cache_name_compare(const char *name1, int len1, const char *name2, int len2)
+{
+	int len = len1 < len2 ? len1 : len2;
+	int cmp;
+
+	cmp = memcmp(name1, name2, len);
+	if (cmp)
+		return cmp;
+	if (len1 < len2)
+		return -1;
+	if (len1 > len2)
+		return 1;
+	return 0;
+}
+
+int cache_name_pos(const char *name, int namelen)
+{
+	int first, last;
+
+	first = 0;
+	last = active_nr;
+	while (last > first) {
+		int next = (last + first) >> 1;
+		struct cache_entry *ce = active_cache[next];
+		int cmp = cache_name_compare(name, namelen, ce->name, ce->namelen);
+		if (!cmp)
+			return next;
+		if (cmp < 0) {
+			last = next;
+			continue;
+		}
+		first = next+1;
+	}
+	return -first-1;
+}
+
+int remove_file_from_cache(char *path)
+{
+	int pos = cache_name_pos(path, strlen(path));
+	if (pos >= 0) {
+		active_nr--;
+		if (pos < active_nr)
+			memmove(active_cache + pos, active_cache + pos + 1, (active_nr - pos) * sizeof(struct cache_entry *));
+	}
+	return 0;
+}
+
+int add_cache_entry(struct cache_entry *ce, int ok_to_add)
+{
+	int pos;
+
+	pos = cache_name_pos(ce->name, ce->namelen);
+
+	/* existing match? Just replace it */
+	if (pos >= 0) {
+		active_cache[pos] = ce;
+		return 0;
+	}
+	pos = -pos-1;
+
+	if (!ok_to_add)
+		return -1;
+
+	/* Make sure the array is big enough .. */
+	if (active_nr == active_alloc) {
+		active_alloc = alloc_nr(active_alloc);
+		active_cache = realloc(active_cache, active_alloc * sizeof(struct cache_entry *));
+	}
+
+	/* Add it in.. */
+	active_nr++;
+	if (active_nr > pos)
+		memmove(active_cache + pos + 1, active_cache + pos, (active_nr - pos - 1) * sizeof(ce));
+	active_cache[pos] = ce;
+	return 0;
+}
+
 static int verify_hdr(struct cache_header *hdr, unsigned long size)
 {
 	SHA_CTX c;
@@ -224,17 +364,16 @@ int read_cache(void)
 		sha1_file_directory = DEFAULT_DB_ENVIRONMENT;
 	if (access(sha1_file_directory, X_OK) < 0)
 		return error("no access to SHA1 file directory");
-	fd = open(".dircache/index", O_RDONLY);
+	fd = open(".git/index", O_RDONLY);
 	if (fd < 0)
 		return (errno == ENOENT) ? 0 : error("open failed");
 
 	size = 0; // avoid gcc warning
 	map = (void *)-1;
 	if (!fstat(fd, &st)) {
-		map = NULL;
 		size = st.st_size;
 		errno = EINVAL;
-		if (size > sizeof(struct cache_header))
+		if (size >= sizeof(struct cache_header))
 			map = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
 	}
 	close(fd);
@@ -263,3 +402,33 @@ unmap:
 	return error("verify header failed");
 }
 
+int write_cache(int newfd, struct cache_entry **cache, int entries)
+{
+	SHA_CTX c;
+	struct cache_header hdr;
+	int i;
+
+	hdr.signature = CACHE_SIGNATURE;
+	hdr.version = 1;
+	hdr.entries = entries;
+
+	SHA1_Init(&c);
+	SHA1_Update(&c, &hdr, offsetof(struct cache_header, sha1));
+	for (i = 0; i < entries; i++) {
+		struct cache_entry *ce = cache[i];
+		int size = ce_size(ce);
+		SHA1_Update(&c, ce, size);
+	}
+	SHA1_Final(hdr.sha1, &c);
+
+	if (write(newfd, &hdr, sizeof(hdr)) != sizeof(hdr))
+		return -1;
+
+	for (i = 0; i < entries; i++) {
+		struct cache_entry *ce = cache[i];
+		int size = ce_size(ce);
+		if (write(newfd, ce, size) != size)
+			return -1;
+	}
+	return 0;
+}