Move "read_tree()" to "tree.c" to be used as a generic helper function.
[git/git.git] / tree.c
diff --git a/tree.c b/tree.c
index 1aee098..e988aed 100644 (file)
--- a/tree.c
+++ b/tree.c
@@ -5,6 +5,71 @@
 
 const char *tree_type = "tree";
 
+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 = malloc(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, 1);
+}
+
+static int read_tree_recursive(void *buffer, unsigned long size,
+                              const char *base, int baselen, int stage)
+{
+       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 (S_ISDIR(mode)) {
+                       int retval;
+                       int pathlen = strlen(path);
+                       char *newbase = malloc(baselen + 1 + pathlen);
+                       void *eltbuf;
+                       char elttype[20];
+                       unsigned long eltsize;
+
+                       eltbuf = read_sha1_file(sha1, elttype, &eltsize);
+                       if (!eltbuf || strcmp(elttype, "tree"))
+                               return -1;
+                       memcpy(newbase, base, baselen);
+                       memcpy(newbase + baselen, path, pathlen);
+                       newbase[baselen + pathlen] = '/';
+                       retval = read_tree_recursive(eltbuf, eltsize,
+                                                    newbase,
+                                                    baselen + pathlen + 1, stage);
+                       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)
+{
+       return read_tree_recursive(buffer, size, "", 0, stage);
+}
+
 struct tree *lookup_tree(unsigned char *sha1)
 {
        struct object *obj = lookup_object(sha1);