func cfStringToGoString()

in wrap.go [105:136]

27 lines of code
5 McCabe index (conditional complexity)


func cfStringToGoString(cfs C.CFStringRef) string {
	if cfs == nullCFStringRef {
		return ""
	}
	cfStr := copyCFString(cfs)
	length := C.CFStringGetLength(cfStr)
	if length == 0 {
		// short-cut for empty strings
		return ""
	}
	cfRange := C.CFRange{0, length}
	enc := C.CFStringEncoding(C.kCFStringEncodingUTF8)
	// first find the buffer size necessary
	var usedBufLen C.CFIndex
	if C.CFStringGetBytes(cfStr, cfRange, enc, 0, C.false, nil, 0, &usedBufLen) == 0 {
		return ""
	}

	bs := make([]byte, usedBufLen)
	buf := (*C.UInt8)(unsafe.Pointer(&bs[0]))
	if C.CFStringGetBytes(cfStr, cfRange, enc, 0, C.false, buf, usedBufLen, nil) == 0 {
		return ""
	}

	// Create a string (byte array) backed by C byte array
	header := (*reflect.SliceHeader)(unsafe.Pointer(&bs))
	strHeader := &reflect.StringHeader{
		Data: header.Data,
		Len:  header.Len,
	}
	return *(*string)(unsafe.Pointer(strHeader))
}