//go:build windows

package app

import (
	"syscall"
	"unsafe"
)

func decodeWithCodePage(b []byte, codePage uint32) string {
	if len(b) == 0 {
		return ""
	}
	kernel32 := syscall.NewLazyDLL("kernel32.dll")
	multiByteToWideChar := kernel32.NewProc("MultiByteToWideChar")
	n, _, _ := multiByteToWideChar.Call(
		uintptr(codePage),
		0,
		uintptr(unsafe.Pointer(&b[0])),
		uintptr(len(b)),
		0,
		0,
	)
	if n == 0 {
		return ""
	}
	buf := make([]uint16, n)
	multiByteToWideChar.Call(
		uintptr(codePage),
		0,
		uintptr(unsafe.Pointer(&b[0])),
		uintptr(len(b)),
		uintptr(unsafe.Pointer(&buf[0])),
		uintptr(len(buf)),
	)
	return utf16ToString(buf)
}