/* Read and unpack a sha1 file into memory, write memory to a sha1 file */
extern int sha1_object_info(const unsigned char *, unsigned long *);
-extern void * unpack_sha1_file(void *map, unsigned long mapsize, enum object_type *type, unsigned long *size);
extern void * read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size);
extern int hash_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *sha1);
extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);