1 files changed, 79 insertions, 0 deletions
diff --git a/object.h b/object.h
new file mode 100644
index 0000000000..b6618d92bf
--- /dev/null
+++ b/object.h
@@ -0,0 +1,79 @@
+#ifndef OBJECT_H
+#define OBJECT_H
+
+struct object_list {
+	struct object *item;
+	struct object_list *next;
+};
+
+struct object_array {
+	unsigned int nr;
+	unsigned int alloc;
+	struct object_array_entry {
+		struct object *item;
+		const char *name;
+		unsigned mode;
+	} *objects;
+};
+
+#define OBJECT_ARRAY_INIT { 0, 0, NULL }
+
+#define TYPE_BITS   3
+#define FLAG_BITS  27
+
+/*
+ * The object type is stored in 3 bits.
+ */
+struct object {
+	unsigned parsed : 1;
+	unsigned used : 1;
+	unsigned type : TYPE_BITS;
+	unsigned flags : FLAG_BITS;
+	unsigned char sha1[20];
+};
+
+extern const char *typename(unsigned int type);
+extern int type_from_string(const char *str);
+
+extern unsigned int get_max_object_index(void);
+extern struct object *get_indexed_object(unsigned int);
+
+/*
+ * This can be used to see if we have heard of the object before, but
+ * it can return "yes we have, and here is a half-initialised object"
+ * for an object that we haven't loaded/parsed yet.
+ *
+ * When parsing a commit to create an in-core commit object, its
+ * parents list holds commit objects that represent its parents, but
+ * they are expected to be lazily initialized and do not know what
+ * their trees or parents are yet.  When this function returns such a
+ * half-initialised objects, the caller is expected to initialize them
+ * by calling parse_object() on them.
+ */
+struct object *lookup_object(const unsigned char *sha1);
+
+extern void *create_object(const unsigned char *sha1, int type, void *obj);
+
+/** Returns the object, having parsed it to find out what it is. **/
+struct object *parse_object(const unsigned char *sha1);
+
+/* Given the result of read_sha1_file(), returns the object after
+ * parsing it.  eaten_p indicates if the object has a borrowed copy
+ * of buffer and the caller should not free() it.
+ */
+struct object *parse_object_buffer(const unsigned char *sha1, enum object_type type, unsigned long size, void *buffer, int *eaten_p);
+
+/** Returns the object, with potentially excess memory allocated. **/
+struct object *lookup_unknown_object(const unsigned  char *sha1);
+
+struct object_list *object_list_insert(struct object *item,
+				       struct object_list **list_p);
+
+int object_list_contains(struct object_list *list, struct object *obj);
+
+/* Object array handling .. */
+void add_object_array(struct object *obj, const char *name, struct object_array *array);
+void add_object_array_with_mode(struct object *obj, const char *name, struct object_array *array, unsigned mode);
+void object_array_remove_duplicates(struct object_array *);
+
+#endif /* OBJECT_H */