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MMKV for Kotlin Multiplatform

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/*
 * Copyright (C) 2022 Ctrip.com.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.ctrip.flight.mmkv

import kotlinx.cinterop.*
import platform.Foundation.NSData
import platform.Foundation.create
import platform.posix.memcpy

/**
 * Between with Kotlin ByteArray and Objective-C NSData convert to each other
 * @author yaqiao
 */

@OptIn(ExperimentalForeignApi::class)
internal fun NSData.toByteArray(): ByteArray {
    val size = length.toInt()
    return ByteArray(size).apply {
        if (size > 0) usePinned {
            memcpy(it.addressOf(0), bytes, length)
        }
    }
}

@OptIn(BetaInteropApi::class, ExperimentalForeignApi::class)
internal fun ByteArray.toNSData(): NSData = memScoped {
    NSData.create(bytes = allocArrayOf(this@toNSData),
        length = [email protected]())
}