-extern void * read_sha1_file(unsigned char *sha1, char *type, unsigned long *size);
-extern int write_sha1_file(char *buf, unsigned len);
-extern int check_sha1_signature(unsigned char *sha1, void *buf, unsigned long size);
+extern void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size);
+extern int write_sha1_file(char *buf, unsigned len, unsigned char *return_sha1);
+
+extern int check_sha1_signature(unsigned char *sha1, void *buf, unsigned long size, const char *type);
+
+/* Read a tree into the cache */
+extern int read_tree(void *buffer, unsigned long size, int stage);
+
+extern int write_sha1_from_fd(const unsigned char *sha1, int fd);
+
+extern int has_sha1_file(const unsigned char *sha1);