parseNonAscii.go

func parseNonAscii(latin1Byte []byte) string {
    isMarking := false
    var byteBuffer []byte

    for _, codePoint := range latin1Byte {
        // 131は0x83の10進数表現
        if codePoint == 131 {
            isMarking = true
            continue
        }

        if isMarking {
            // 6bit目を反転させるために
            // 0x20をXORする
            invertCodePoint := codePoint ^ 32
            byteBuffer = append(byteBuffer, invertCodePoint)
            isMarking = false
        } else {
            byteBuffer = append(byteBuffer, codePoint)
        }
    }

    return string(byteBuffer)
}