user-manual: insert earlier of mention content-addressable architecture

diff --git a/object.c b/object.c
index 37277f94384fff1320381a370dd4d6c91a4ded2c..de244e206375d43f2bd327a0c3058ea24d53704e 100644 (file)
--- a/object.c
+++ b/object.c
@@ -19,7 +19,8 @@ struct object *get_indexed_object(unsigned int idx)
 }
 
 const char *type_names[] = {
-       "none", "blob", "tree", "commit", "bad"
+       "none", "commit", "tree", "blob", "tag",
+       "bad type 5", "bad type 6", "delta", "bad",
 };
 
 static unsigned int hash_obj(struct object *obj, unsigned int n)
@@ -57,7 +58,7 @@ struct object *lookup_object(const unsigned char *sha1)
 
        i = hashtable_index(sha1);
        while ((obj = obj_hash[i]) != NULL) {
-               if (!memcmp(sha1, obj->sha1, 20))
+               if (!hashcmp(sha1, obj->sha1))
                        break;
                i++;
                if (i == obj_hash_size)
@@ -72,7 +73,7 @@ static void grow_object_hash(void)
        int new_hash_size = obj_hash_size < 32 ? 32 : 2 * obj_hash_size;
        struct object **new_hash;
 
-       new_hash = calloc(new_hash_size, sizeof(struct object *));
+       new_hash = xcalloc(new_hash_size, sizeof(struct object *));
        for (i = 0; i < obj_hash_size; i++) {
                struct object *obj = obj_hash[i];
                if (!obj)
@@ -88,9 +89,9 @@ void created_object(const unsigned char *sha1, struct object *obj)
 {
        obj->parsed = 0;
        obj->used = 0;
-       obj->type = TYPE_NONE;
+       obj->type = OBJ_NONE;
        obj->flags = 0;
-       memcpy(obj->sha1, sha1, 20);
+       hashcpy(obj->sha1, sha1);
 
        if (obj_hash_size - 1 <= nr_objs * 2)
                grow_object_hash();
@@ -131,48 +132,62 @@ struct object *lookup_unknown_object(const unsigned char *sha1)
        if (!obj) {
                union any_object *ret = xcalloc(1, sizeof(*ret));
                created_object(sha1, &ret->object);
-               ret->object.type = TYPE_NONE;
+               ret->object.type = OBJ_NONE;
                return &ret->object;
        }
        return obj;
 }
 
+struct object *parse_object_buffer(const unsigned char *sha1, const char *type, unsigned long size, void *buffer, int *eaten_p)
+{
+       struct object *obj;
+       int eaten = 0;
+
+       if (!strcmp(type, blob_type)) {
+               struct blob *blob = lookup_blob(sha1);
+               parse_blob_buffer(blob, buffer, size);
+               obj = &blob->object;
+       } else if (!strcmp(type, tree_type)) {
+               struct tree *tree = lookup_tree(sha1);
+               obj = &tree->object;
+               if (!tree->object.parsed) {
+                       parse_tree_buffer(tree, buffer, size);
+                       eaten = 1;
+               }
+       } else if (!strcmp(type, commit_type)) {
+               struct commit *commit = lookup_commit(sha1);
+               parse_commit_buffer(commit, buffer, size);
+               if (!commit->buffer) {
+                       commit->buffer = buffer;
+                       eaten = 1;
+               }
+               obj = &commit->object;
+       } else if (!strcmp(type, tag_type)) {
+               struct tag *tag = lookup_tag(sha1);
+               parse_tag_buffer(tag, buffer, size);
+               obj = &tag->object;
+       } else {
+               obj = NULL;
+       }
+       *eaten_p = eaten;
+       return obj;
+}
+
 struct object *parse_object(const unsigned char *sha1)
 {
        unsigned long size;
        char type[20];
+       int eaten;
        void *buffer = read_sha1_file(sha1, type, &size);
+
        if (buffer) {
                struct object *obj;
                if (check_sha1_signature(sha1, buffer, size, type) < 0)
                        printf("sha1 mismatch %s\n", sha1_to_hex(sha1));
-               if (!strcmp(type, blob_type)) {
-                       struct blob *blob = lookup_blob(sha1);
-                       parse_blob_buffer(blob, buffer, size);
-                       obj = &blob->object;
-               } else if (!strcmp(type, tree_type)) {
-                       struct tree *tree = lookup_tree(sha1);
-                       obj = &tree->object;
-                       if (!tree->object.parsed) {
-                               parse_tree_buffer(tree, buffer, size);
-                               buffer = NULL;
-                       }
-               } else if (!strcmp(type, commit_type)) {
-                       struct commit *commit = lookup_commit(sha1);
-                       parse_commit_buffer(commit, buffer, size);
-                       if (!commit->buffer) {
-                               commit->buffer = buffer;
-                               buffer = NULL;
-                       }
-                       obj = &commit->object;
-               } else if (!strcmp(type, tag_type)) {
-                       struct tag *tag = lookup_tag(sha1);
-                       parse_tag_buffer(tag, buffer, size);
-                       obj = &tag->object;
-               } else {
-                       obj = NULL;
-               }
-               free(buffer);
+
+               obj = parse_object_buffer(sha1, type, size, buffer, &eaten);
+               if (!eaten)
+                       free(buffer);
                return obj;
        }
        return NULL;