[PATCH] delta check
[git/git.git] / tree.c
diff --git a/tree.c b/tree.c
index 1aee098..d448dae 100644 (file)
--- a/tree.c
+++ b/tree.c
@@ -5,16 +5,87 @@
 
 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 = 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);
+}
+
+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;
+                       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);
+                       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);
        if (!obj) {
-               struct tree *ret = malloc(sizeof(struct tree));
+               struct tree *ret = xmalloc(sizeof(struct tree));
                memset(ret, 0, sizeof(struct tree));
                created_object(sha1, &ret->object);
+               ret->object.type = tree_type;
                return ret;
        }
-       if (obj->parsed && obj->type != tree_type) {
+       if (!obj->type)
+               obj->type = tree_type;
+       if (obj->type != tree_type) {
                error("Object %s is a %s, not a tree", 
                      sha1_to_hex(sha1), obj->type);
                return NULL;
@@ -22,24 +93,18 @@ struct tree *lookup_tree(unsigned char *sha1)
        return (struct tree *) obj;
 }
 
-int parse_tree(struct tree *item)
+int parse_tree_buffer(struct tree *item, void *buffer, unsigned long size)
 {
-       char type[20];
-       void *buffer, *bufptr;
-       unsigned long size;
+       void *bufptr = buffer;
+       struct tree_entry_list **list_p;
+
        if (item->object.parsed)
                return 0;
        item->object.parsed = 1;
-       item->object.type = tree_type;
-       buffer = bufptr = read_sha1_file(item->object.sha1, type, &size);
-       if (!buffer)
-               return error("Could not read %s",
-                            sha1_to_hex(item->object.sha1));
-       if (strcmp(type, tree_type))
-               return error("Object %s not a tree",
-                            sha1_to_hex(item->object.sha1));
+       list_p = &item->entries;
        while (size) {
                struct object *obj;
+               struct tree_entry_list *entry;
                int len = 1+strlen(bufptr);
                unsigned char *file_sha1 = bufptr + len;
                char *path = strchr(bufptr, ' ');
@@ -48,20 +113,52 @@ int parse_tree(struct tree *item)
                    sscanf(bufptr, "%o", &mode) != 1)
                        return -1;
 
-               /* Warn about trees that don't do the recursive thing.. */
-               if (strchr(path, '/')) {
-                       item->has_full_path = 1;
-               }
+               entry = xmalloc(sizeof(struct tree_entry_list));
+               entry->name = strdup(path + 1);
+               entry->directory = S_ISDIR(mode) != 0;
+               entry->executable = (mode & S_IXUSR) != 0;
+               entry->symlink = S_ISLNK(mode) != 0;
+               entry->mode = mode;
+               entry->next = NULL;
 
                bufptr += len + 20;
                size -= len + 20;
 
-               if (S_ISDIR(mode)) {
-                       obj = &lookup_tree(file_sha1)->object;
+               if (entry->directory) {
+                       entry->item.tree = lookup_tree(file_sha1);
+                       obj = &entry->item.tree->object;
                } else {
-                       obj = &lookup_blob(file_sha1)->object;
+                       entry->item.blob = lookup_blob(file_sha1);
+                       obj = &entry->item.blob->object;
                }
-               add_ref(&item->object, obj);
+               if (obj)
+                       add_ref(&item->object, obj);
+
+               *list_p = entry;
+               list_p = &entry->next;
        }
        return 0;
 }
+
+int parse_tree(struct tree *item)
+{
+        char type[20];
+        void *buffer;
+        unsigned long size;
+        int ret;
+
+       if (item->object.parsed)
+               return 0;
+       buffer = read_sha1_file(item->object.sha1, type, &size);
+       if (!buffer)
+               return error("Could not read %s",
+                            sha1_to_hex(item->object.sha1));
+       if (strcmp(type, tree_type)) {
+               free(buffer);
+               return error("Object %s not a tree",
+                            sha1_to_hex(item->object.sha1));
+       }
+       ret = parse_tree_buffer(item, buffer, size);
+       free(buffer);
+       return ret;
+}