+static int read_one_entry(unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode, int stage)
+{
+ int len = strlen(pathname);
+ unsigned int size = cache_entry_size(baselen + len);
+ struct cache_entry *ce = xmalloc(size);
+
+ memset(ce, 0, size);
+
+ ce->ce_mode = create_ce_mode(mode);
+ ce->ce_flags = create_ce_flags(baselen + len, stage);
+ memcpy(ce->name, base, baselen);
+ memcpy(ce->name + baselen, pathname, len+1);
+ memcpy(ce->sha1, sha1, 20);
+ return add_cache_entry(ce, ADD_CACHE_OK_TO_ADD|ADD_CACHE_SKIP_DFCHECK);
+}
+
+static int match_tree_entry(const char *base, int baselen, const char *path, unsigned int mode, const char **paths)
+{
+ const char *match;
+ int pathlen;
+
+ if (!paths)
+ return 1;
+ pathlen = strlen(path);
+ while ((match = *paths++) != NULL) {
+ int matchlen = strlen(match);
+
+ if (baselen >= matchlen) {
+ /* If it doesn't match, move along... */
+ if (strncmp(base, match, matchlen))
+ continue;
+ /* The base is a subdirectory of a path which was specified. */
+ return 1;
+ }
+
+ /* Does the base match? */
+ if (strncmp(base, match, baselen))
+ continue;
+
+ match += baselen;
+ matchlen -= baselen;
+
+ if (pathlen > matchlen)
+ continue;
+
+ if (matchlen > pathlen) {
+ if (match[pathlen] != '/')
+ continue;
+ if (!S_ISDIR(mode))
+ continue;
+ }
+
+ if (strncmp(path, match, pathlen))
+ continue;
+
+ return 1;
+ }
+ return 0;
+}
+
+static int read_tree_recursive(void *buffer, unsigned long size,
+ const char *base, int baselen,
+ int stage, const char **match)
+{
+ while (size) {
+ int len = strlen(buffer)+1;
+ unsigned char *sha1 = buffer + len;
+ char *path = strchr(buffer, ' ')+1;
+ unsigned int mode;
+
+ if (size < len + 20 || sscanf(buffer, "%o", &mode) != 1)
+ return -1;
+
+ buffer = sha1 + 20;
+ size -= len + 20;
+
+ if (!match_tree_entry(base, baselen, path, mode, match))
+ continue;
+
+ if (S_ISDIR(mode)) {
+ int retval;
+ int pathlen = strlen(path);
+ char *newbase;
+ void *eltbuf;
+ char elttype[20];
+ unsigned long eltsize;
+
+ eltbuf = read_sha1_file(sha1, elttype, &eltsize);
+ if (!eltbuf || strcmp(elttype, "tree")) {
+ if (eltbuf) free(eltbuf);
+ return -1;
+ }
+ newbase = xmalloc(baselen + 1 + pathlen);
+ memcpy(newbase, base, baselen);
+ memcpy(newbase + baselen, path, pathlen);
+ newbase[baselen + pathlen] = '/';
+ retval = read_tree_recursive(eltbuf, eltsize,
+ newbase,
+ baselen + pathlen + 1,
+ stage, match);
+ free(eltbuf);
+ free(newbase);
+ if (retval)
+ return -1;
+ continue;
+ }
+ if (read_one_entry(sha1, base, baselen, path, mode, stage) < 0)
+ return -1;
+ }
+ return 0;
+}
+
+int read_tree(void *buffer, unsigned long size, int stage, const char **match)
+{
+ return read_tree_recursive(buffer, size, "", 0, stage, match);
+}
+
+struct tree *lookup_tree(const unsigned char *sha1)