You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: ridiff.go
    path of file: ./repos/ipsw/pkg/ota/ridiff
    
    the code of the file until where you have to start completion: //go:build darwin && cgo

package ridiff

/*
#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>

typedef struct
{
    int64_t unknown1;
    int64_t unknown2;
    char *input;
    c
    
func RawImagePatch(input, patch, output string, verbose uint32) error {

	i := C.CString(input)
	defer C.free(unsafe.Pointer(i))

	p := C.CString(patch)
	defer C.free(unsafe.Pointer(p))

	o := C.CString(output)
	defer C.free(unsafe.Pointer(o))

	ret := C.ParseRawImage(i, o, p, C.uint32_t(verbose))
	if ret != 0 {
		return fmt.Errorf("error parsing raw image: %v", errors.New(C.GoString(C.dlerror())))
	}

	return nil
}