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ByteArray64.kt

/**
 * ByteArray that can hold larger than 4 GiB of Data.
 *
 * Works kind of like Bank Switching of old game console's cartridges which does same thing.
 *
 * Created by Minjaesong on 2017-04-12.
 */
class ByteArray64(val size: Long) {
    private val bankSize: Int = 1 shr 30 // 2^30 Bytes, or 1 GiB
    private val data: Array<ByteArray>

    init {
        if (size <= 0)
            throw IllegalArgumentException("Invalid array size!")

        val requiredChunks = Math.ceil(size.toDouble() / bankSize).toInt()

        data = Array<ByteArray>(requiredChunks, { kotlin.ByteArray(bankSize, { 0.toByte() }) })
    }

    private fun Long.toBankNumber(): Int = (this / bankSize).toInt()
    private fun Long.toBankOffset(): Int = (this % bankSize).toInt()

    operator fun set(index: Long, value: Byte) {
        if (index < 0 || index >= size)
            throw ArrayIndexOutOfBoundsException()

        data[index.toBankNumber()][index.toBankOffset()] = value
    }

    operator fun get(index: Long): Byte {
        if (index < 0 || index >= size)
            throw ArrayIndexOutOfBoundsException()

        return data[index.toBankNumber()][index.toBankOffset()]
    }
}

newtest.md

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