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Resources for Compose JB

There is a newer version: 1.8.0-alpha01

/*
 * Copyright 2020-2022 JetBrains s.r.o. and respective authors and developers.
 * Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE.txt file.
 */

package org.jetbrains.compose.resources

import kotlinx.cinterop.addressOf
import kotlinx.cinterop.usePinned
import platform.Foundation.NSBundle
import platform.Foundation.NSData
import platform.Foundation.NSFileManager
import platform.posix.memcpy

@ExperimentalResourceApi
actual fun resource(path: String): Resource = UIKitResourceImpl(path)

@ExperimentalResourceApi
private class UIKitResourceImpl(path: String) : AbstractResourceImpl(path) {
    override suspend fun readBytes(): ByteArray {
        val fileManager = NSFileManager.defaultManager()
        // todo: support fallback path at bundle root?
        val composeResourcesPath = NSBundle.mainBundle.resourcePath + "/compose-resources/" + path
        val contentsAtPath: NSData? = fileManager.contentsAtPath(composeResourcesPath)
        if (contentsAtPath != null) {
            val byteArray = ByteArray(contentsAtPath.length.toInt())
            byteArray.usePinned {
                memcpy(it.addressOf(0), contentsAtPath.bytes, contentsAtPath.length)
            }
            return byteArray
        } else {
            throw MissingResourceException(path)
        }
    }
}

internal actual class MissingResourceException actual constructor(path: String) :
    Exception("Missing resource with path: $path")