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Implement kotlinx-datetime for the Android native targets (#344)
To test, run an Android emulator, and then, in the command line, ./gradlew androidNativeArm64TestBinaries && adb push core/build/bin/androidNativeArm64/debugTest/test.kexe /data/local/tmp/ && adb shell /data/local/tmp/test.kexe Change `Arm64` to another platfom (`X86`, `X64`, or `Arm32`) as needed.
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| /* | ||
| * Copyright 2019-2023 JetBrains s.r.o. | ||
| * Use of this source code is governed by the Apache 2.0 License that can be found in the LICENSE.txt file. | ||
| */ | ||
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| @file:OptIn(ExperimentalForeignApi::class) | ||
| package kotlinx.datetime.internal | ||
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| import kotlinx.cinterop.* | ||
| import platform.posix.* | ||
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| internal actual val systemTzdb: TimeZoneDatabase get() = tzdb.getOrThrow() | ||
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| private val tzdb = runCatching { TzdbBionic() } | ||
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| internal actual fun currentSystemDefaultZone(): Pair<String, TimeZoneRules?> = memScoped { | ||
| val name = readSystemProperty("persist.sys.timezone") | ||
| ?: throw IllegalStateException("The system property 'persist.sys.timezone' should contain the system timezone") | ||
| return name to null | ||
| } | ||
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| private fun readSystemProperty(name: String): String? = memScoped { | ||
| // see https://android.googlesource.com/platform/bionic/+/froyo/libc/include/sys/system_properties.h | ||
| val result = allocArray<ByteVar>(92) | ||
| val error = __system_property_get(name, result) | ||
| if (error == 0) null else result.toKString() | ||
| } |
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| @@ -0,0 +1,72 @@ | ||
| /* | ||
| * Copyright 2019-2024 JetBrains s.r.o. and contributors. | ||
| * Use of this source code is governed by the Apache 2.0 License that can be found in the LICENSE.txt file. | ||
| */ | ||
| /* | ||
| * Based on the bionic project. | ||
| * Copyright (C) 2017 The Android Open Source Project | ||
| */ | ||
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| package kotlinx.datetime.internal | ||
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| private class TzdbBionic(private val rules: Map<String, Entry>) : TimeZoneDatabase { | ||
| override fun rulesForId(id: String): TimeZoneRules = | ||
| rules[id]?.readRules() ?: throw IllegalStateException("Unknown time zone $id") | ||
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| override fun availableTimeZoneIds(): Set<String> = rules.keys | ||
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| class Entry(val file: ByteArray, val offset: Int, val length: Int) { | ||
| fun readRules(): TimeZoneRules = readTzFile(file.copyOfRange(offset, offset + length)).toTimeZoneRules() | ||
| } | ||
| } | ||
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| // see https://android.googlesource.com/platform/bionic/+/master/libc/tzcode/bionic.cpp for the format | ||
| internal fun TzdbBionic(): TimeZoneDatabase = TzdbBionic(buildMap<String, TzdbBionic.Entry> { | ||
| for (path in listOf( | ||
| Path.fromString("/system/usr/share/zoneinfo/tzdata"), // immutable fallback tzdb | ||
| Path.fromString("/apex/com.android.tzdata/etc/tz/tzdata"), // an up-to-date tzdb, may not exist | ||
| )) { | ||
| if (path.check() == null) continue // the file does not exist | ||
| // be careful to only read each file a single time and keep many references to the same ByteArray in memory. | ||
| val content = path.readBytes() | ||
| val header = BionicTzdbHeader.parse(content) | ||
| val indexSize = header.data_offset - header.index_offset | ||
| check(indexSize % 52 == 0) { "Invalid index size: $indexSize (must be a multiple of 52)" } | ||
| val reader = BinaryDataReader(content, header.index_offset) | ||
| repeat(indexSize / 52) { | ||
| val name = reader.readNullTerminatedUtf8String(40) | ||
| val start = reader.readInt() | ||
| val length = reader.readInt() | ||
| reader.readInt() // unused | ||
| // intentionally overwrite the older entries | ||
| put(name, TzdbBionic.Entry(content, header.data_offset + start, length)) | ||
| } | ||
| } | ||
| }) | ||
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| // bionic_tzdata_header_t | ||
| private class BionicTzdbHeader( | ||
| val version: String, | ||
| val index_offset: Int, | ||
| val data_offset: Int, | ||
| val final_offset: Int, | ||
| ) { | ||
| override fun toString(): String = | ||
| "BionicTzdbHeader(version='$version', index_offset=$index_offset, " + | ||
| "data_offset=$data_offset, final_offset=$final_offset)" | ||
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| companion object { | ||
| fun parse(content: ByteArray): BionicTzdbHeader = | ||
| with(BinaryDataReader(content)) { | ||
| BionicTzdbHeader( | ||
| version = readNullTerminatedUtf8String(12), | ||
| index_offset = readInt(), | ||
| data_offset = readInt(), | ||
| final_offset = readInt(), | ||
| ) | ||
| }.apply { | ||
| check(version.startsWith("tzdata") && version.length < 12) { "Unknown tzdata version: $version" } | ||
| check(index_offset <= data_offset) { "Invalid data and index offsets: $data_offset and $index_offset" } | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,43 @@ | ||
| /* | ||
| * Copyright 2019-2023 JetBrains s.r.o. and contributors. | ||
| * Use of this source code is governed by the Apache 2.0 License that can be found in the LICENSE.txt file. | ||
| */ | ||
|
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| @file:OptIn(ExperimentalForeignApi::class, UnsafeNumber::class) | ||
| package kotlinx.datetime.internal | ||
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| import kotlinx.cinterop.* | ||
| import platform.posix.* | ||
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| internal fun Path.chaseSymlinks(maxDepth: Int = 100): Path { | ||
| var realPath = this | ||
| var depth = maxDepth | ||
| while (true) { | ||
| realPath = realPath.readLink() ?: break | ||
| if (depth-- == 0) throw RuntimeException("Too many levels of symbolic links") | ||
| } | ||
| return realPath | ||
| } | ||
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| internal fun Path.traverseDirectory(exclude: Set<String> = emptySet(), stripLeadingComponents: Int = this.components.size, actionOnFile: (Path) -> Unit) { | ||
| val handler = opendir(this.toString()) ?: return | ||
| try { | ||
| while (true) { | ||
| val entry = readdir(handler) ?: break | ||
| val name = entry.pointed.d_name.toKString() | ||
| if (name == "." || name == "..") continue | ||
| if (name in exclude) continue | ||
| val path = Path(isAbsolute, components + name) | ||
| val info = path.check() ?: continue // skip broken symlinks | ||
| if (info.isDirectory) { | ||
| if (!info.isSymlink) { | ||
| path.traverseDirectory(exclude, stripLeadingComponents, actionOnFile) | ||
| } | ||
| } else { | ||
| actionOnFile(Path(false, path.components.drop(stripLeadingComponents))) | ||
| } | ||
| } | ||
| } finally { | ||
| closedir(handler) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,25 @@ | ||
| Copyright (C) 2017 The Android Open Source Project | ||
| All rights reserved. | ||
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| Redistribution and use in source and binary forms, with or without | ||
| modification, are permitted provided that the following conditions | ||
| are met: | ||
| * Redistributions of source code must retain the above copyright | ||
| notice, this list of conditions and the following disclaimer. | ||
| * Redistributions in binary form must reproduce the above copyright | ||
| notice, this list of conditions and the following disclaimer in | ||
| the documentation and/or other materials provided with the | ||
| distribution. | ||
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| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
| "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
| LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS | ||
| FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE | ||
| COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, | ||
| INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, | ||
| BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS | ||
| OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED | ||
| AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, | ||
| OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT | ||
| OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | ||
| SUCH DAMAGE. |