int cgit_diff_files(const unsigned char *old_sha1,
const unsigned char *new_sha1, unsigned long *old_size,
unsigned long *new_size, int *binary, int context,
int cgit_diff_files(const unsigned char *old_sha1,
const unsigned char *new_sha1, unsigned long *old_size,
unsigned long *new_size, int *binary, int context,