mirror of
https://github.com/dart-lang/sdk
synced 2024-09-15 21:50:11 +00:00
678cb048ed
Fixes #26665 R=sgjesse@google.com Review URL: https://codereview.chromium.org/2050413002 .
1038 lines
30 KiB
Dart
1038 lines
30 KiB
Dart
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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part of dart.io;
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// Read the file in blocks of size 64k.
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const int _BLOCK_SIZE = 64 * 1024;
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class _FileStream extends Stream<List<int>> {
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// Stream controller.
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StreamController<List<int>> _controller;
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// Information about the underlying file.
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String _path;
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RandomAccessFile _openedFile;
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int _position;
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int _end;
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final Completer _closeCompleter = new Completer();
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// Has the stream been paused or unsubscribed?
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bool _unsubscribed = false;
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// Is there a read currently in progress?
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bool _readInProgress = true;
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bool _closed = false;
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bool _atEnd = false;
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_FileStream(this._path, this._position, this._end) {
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if (_position == null) _position = 0;
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}
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_FileStream.forStdin() : _position = 0;
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StreamSubscription<List<int>> listen(void onData(List<int> event),
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{Function onError,
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void onDone(),
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bool cancelOnError}) {
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_setupController();
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return _controller.stream.listen(onData,
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onError: onError,
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onDone: onDone,
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cancelOnError: cancelOnError);
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}
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void _setupController() {
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_controller = new StreamController<List<int>>(sync: true,
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onListen: _start,
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onResume: _readBlock,
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onCancel: () {
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_unsubscribed = true;
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return _closeFile();
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});
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}
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Future _closeFile() {
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if (_readInProgress || _closed) {
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return _closeCompleter.future;
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}
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_closed = true;
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void done() {
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_closeCompleter.complete();
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_controller.close();
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}
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_openedFile.close()
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.catchError(_controller.addError)
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.whenComplete(done);
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return _closeCompleter.future;
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}
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void _readBlock() {
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// Don't start a new read if one is already in progress.
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if (_readInProgress) return;
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if (_atEnd) {
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_closeFile();
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return;
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}
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_readInProgress = true;
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int readBytes = _BLOCK_SIZE;
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if (_end != null) {
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readBytes = min(readBytes, _end - _position);
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if (readBytes < 0) {
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_readInProgress = false;
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if (!_unsubscribed) {
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_controller.addError(new RangeError("Bad end position: $_end"));
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_closeFile();
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_unsubscribed = true;
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}
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return;
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}
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}
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_openedFile.read(readBytes)
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.then((block) {
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_readInProgress = false;
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if (_unsubscribed) {
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_closeFile();
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return;
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}
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_position += block.length;
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if (block.length < readBytes ||
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(_end != null && _position == _end)) {
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_atEnd = true;
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}
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if (!_atEnd && !_controller.isPaused) {
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_readBlock();
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}
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_controller.add(block);
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if (_atEnd) {
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_closeFile();
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}
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})
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.catchError((e, s) {
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if (!_unsubscribed) {
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_controller.addError(e, s);
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_closeFile();
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_unsubscribed = true;
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}
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});
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}
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void _start() {
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if (_position < 0) {
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_controller.addError(new RangeError("Bad start position: $_position"));
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_controller.close();
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_closeCompleter.complete();
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return;
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}
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void onReady(RandomAccessFile file) {
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_openedFile = file;
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_readInProgress = false;
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_readBlock();
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}
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void onOpenFile(RandomAccessFile file) {
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if (_position > 0) {
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file.setPosition(_position)
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.then(onReady, onError: (e, s) {
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_controller.addError(e, s);
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_readInProgress = false;
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_closeFile();
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});
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} else {
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onReady(file);
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}
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}
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void openFailed(error, stackTrace) {
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_controller.addError(error, stackTrace);
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_controller.close();
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_closeCompleter.complete();
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}
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if (_path != null) {
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new File(_path).open(mode: FileMode.READ)
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.then(onOpenFile, onError: openFailed);
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} else {
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try {
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onOpenFile(_File._openStdioSync(0));
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} catch (e, s) {
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openFailed(e, s);
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}
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}
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}
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}
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class _FileStreamConsumer extends StreamConsumer<List<int>> {
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File _file;
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Future<RandomAccessFile> _openFuture;
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_FileStreamConsumer(File this._file, FileMode mode) {
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_openFuture = _file.open(mode: mode);
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}
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_FileStreamConsumer.fromStdio(int fd) {
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assert(1 <= fd && fd <= 2);
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_openFuture = new Future.value(_File._openStdioSync(fd));
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}
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Future<File> addStream(Stream<List<int>> stream) {
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Completer<File> completer = new Completer<File>.sync();
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_openFuture
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.then((openedFile) {
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var _subscription;
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void error(e, [StackTrace stackTrace]) {
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_subscription.cancel();
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openedFile.close();
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completer.completeError(e, stackTrace);
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}
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_subscription = stream.listen(
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(d) {
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_subscription.pause();
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try {
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openedFile.writeFrom(d, 0, d.length)
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.then((_) => _subscription.resume(),
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onError: error);
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} catch (e, stackTrace) {
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error(e, stackTrace);
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}
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},
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onDone: () {
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completer.complete(_file);
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},
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onError: error,
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cancelOnError: true);
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})
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.catchError(completer.completeError);
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return completer.future;
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}
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Future<File> close() =>
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_openFuture.then/*<File>*/((openedFile) => openedFile.close());
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}
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// Class for encapsulating the native implementation of files.
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class _File extends FileSystemEntity implements File {
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final String path;
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// Constructor for file.
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_File(this.path) {
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if (path is! String) {
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throw new ArgumentError('${Error.safeToString(path)} '
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'is not a String');
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}
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}
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Future<bool> exists() {
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return _IOService._dispatch(_FILE_EXISTS, [path]).then((response) {
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if (_isErrorResponse(response)) {
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throw _exceptionFromResponse(response, "Cannot check existence", path);
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}
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return response;
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});
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}
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external static _exists(String path);
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bool existsSync() {
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var result = _exists(path);
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throwIfError(result, "Cannot check existence of file", path);
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return result;
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}
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File get absolute => new File(_absolutePath);
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Future<FileStat> stat() => FileStat.stat(path);
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FileStat statSync() => FileStat.statSync(path);
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Future<File> create({bool recursive: false}) {
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var result = recursive ? parent.create(recursive: true)
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: new Future.value(null);
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return result
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.then((_) => _IOService._dispatch(_FILE_CREATE, [path]))
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.then((response) {
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if (_isErrorResponse(response)) {
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throw _exceptionFromResponse(response, "Cannot create file", path);
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}
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return this;
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});
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}
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external static _create(String path);
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external static _createLink(String path, String target);
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external static _linkTarget(String path);
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void createSync({bool recursive: false}) {
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if (recursive) {
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parent.createSync(recursive: true);
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}
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var result = _create(path);
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throwIfError(result, "Cannot create file", path);
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}
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Future<File> _delete({bool recursive: false}) {
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if (recursive) {
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return new Directory(path).delete(recursive: true).then((_) => this);
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}
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return _IOService._dispatch(_FILE_DELETE, [path]).then((response) {
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if (_isErrorResponse(response)) {
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throw _exceptionFromResponse(response, "Cannot delete file", path);
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}
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return this;
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});
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}
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external static _deleteNative(String path);
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external static _deleteLinkNative(String path);
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void _deleteSync({bool recursive: false}) {
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if (recursive) {
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return new Directory(path).deleteSync(recursive: true);
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}
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var result = _deleteNative(path);
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throwIfError(result, "Cannot delete file", path);
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}
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Future<File> rename(String newPath) {
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return _IOService._dispatch(_FILE_RENAME, [path, newPath]).then((response) {
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if (_isErrorResponse(response)) {
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throw _exceptionFromResponse(
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response, "Cannot rename file to '$newPath'", path);
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}
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return new File(newPath);
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});
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}
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external static _rename(String oldPath, String newPath);
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external static _renameLink(String oldPath, String newPath);
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File renameSync(String newPath) {
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var result = _rename(path, newPath);
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throwIfError(result, "Cannot rename file to '$newPath'", path);
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return new File(newPath);
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}
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Future<File> copy(String newPath) {
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return _IOService._dispatch(_FILE_COPY, [path, newPath]).then((response) {
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if (_isErrorResponse(response)) {
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throw _exceptionFromResponse(
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response, "Cannot copy file to '$newPath'", path);
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}
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return new File(newPath);
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});
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}
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external static _copy(String oldPath, String newPath);
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File copySync(String newPath) {
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var result = _copy(path, newPath);
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throwIfError(result, "Cannot copy file to '$newPath'", path);
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return new File(newPath);
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}
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Future<RandomAccessFile> open({FileMode mode: FileMode.READ}) {
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if (mode != FileMode.READ &&
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mode != FileMode.WRITE &&
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mode != FileMode.APPEND &&
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mode != FileMode.WRITE_ONLY &&
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mode != FileMode.WRITE_ONLY_APPEND) {
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return new Future.error(
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new ArgumentError('Invalid file mode for this operation'));
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}
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return _IOService._dispatch(_FILE_OPEN, [path, mode._mode])
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.then((response) {
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if (_isErrorResponse(response)) {
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throw _exceptionFromResponse(response, "Cannot open file", path);
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}
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return new _RandomAccessFile(response, path);
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});
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}
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Future<int> length() {
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return _IOService._dispatch(_FILE_LENGTH_FROM_PATH, [path])
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.then((response) {
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if (_isErrorResponse(response)) {
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throw _exceptionFromResponse(response,
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"Cannot retrieve length of file",
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path);
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}
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return response;
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});
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}
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external static _lengthFromPath(String path);
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int lengthSync() {
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var result = _lengthFromPath(path);
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throwIfError(result, "Cannot retrieve length of file", path);
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return result;
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}
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Future<DateTime> lastModified() {
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return _IOService._dispatch(_FILE_LAST_MODIFIED, [path]).then((response) {
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if (_isErrorResponse(response)) {
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throw _exceptionFromResponse(response,
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"Cannot retrieve modification time",
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path);
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}
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return new DateTime.fromMillisecondsSinceEpoch(response);
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});
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}
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external static _lastModified(String path);
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DateTime lastModifiedSync() {
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var ms = _lastModified(path);
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throwIfError(ms, "Cannot retrieve modification time", path);
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return new DateTime.fromMillisecondsSinceEpoch(ms);
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}
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external static _open(String path, int mode);
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RandomAccessFile openSync({FileMode mode: FileMode.READ}) {
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if (mode != FileMode.READ &&
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mode != FileMode.WRITE &&
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mode != FileMode.APPEND &&
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mode != FileMode.WRITE_ONLY &&
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mode != FileMode.WRITE_ONLY_APPEND) {
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throw new ArgumentError('Invalid file mode for this operation');
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}
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var id = _open(path, mode._mode);
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throwIfError(id, "Cannot open file", path);
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return new _RandomAccessFile(id, path);
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}
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external static int _openStdio(int fd);
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static RandomAccessFile _openStdioSync(int fd) {
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var id = _openStdio(fd);
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if (id == 0) {
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throw new FileSystemException("Cannot open stdio file for: $fd");
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}
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return new _RandomAccessFile(id, "");
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}
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Stream<List<int>> openRead([int start, int end]) {
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return new _FileStream(path, start, end);
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}
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IOSink openWrite({FileMode mode: FileMode.WRITE,
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Encoding encoding: UTF8}) {
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if (mode != FileMode.WRITE &&
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mode != FileMode.APPEND &&
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mode != FileMode.WRITE_ONLY &&
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mode != FileMode.WRITE_ONLY_APPEND) {
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throw new ArgumentError('Invalid file mode for this operation');
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}
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var consumer = new _FileStreamConsumer(this, mode);
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return new IOSink(consumer, encoding: encoding);
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}
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Future<List<int>> readAsBytes() {
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Future<List<int>> readDataChunked(RandomAccessFile file) {
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var builder = new BytesBuilder(copy: false);
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var completer = new Completer<List<int>>();
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void read() {
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file.read(_BLOCK_SIZE).then((data) {
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if (data.length > 0) {
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builder.add(data);
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read();
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} else {
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completer.complete(builder.takeBytes());
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}
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}, onError: completer.completeError);
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}
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read();
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return completer.future;
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}
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return open().then((file) {
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return file.length().then((length) {
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if (length == 0) {
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// May be character device, try to read it in chunks.
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return readDataChunked(file);
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}
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return file.read(length);
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}).whenComplete(file.close);
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});
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}
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List<int> readAsBytesSync() {
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var opened = openSync();
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try {
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List<int> data;
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var length = opened.lengthSync();
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if (length == 0) {
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// May be character device, try to read it in chunks.
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var builder = new BytesBuilder(copy: false);
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do {
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data = opened.readSync(_BLOCK_SIZE);
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if (data.length > 0) builder.add(data);
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} while (data.length > 0);
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data = builder.takeBytes();
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} else {
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data = opened.readSync(length);
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}
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return data;
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} finally {
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opened.closeSync();
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}
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}
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String _tryDecode(List<int> bytes, Encoding encoding) {
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try {
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return encoding.decode(bytes);
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} catch (_) {
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throw new FileSystemException(
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"Failed to decode data using encoding '${encoding.name}'", path);
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}
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}
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Future<String> readAsString({Encoding encoding: UTF8}) =>
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readAsBytes().then((bytes) => _tryDecode(bytes, encoding));
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String readAsStringSync({Encoding encoding: UTF8}) =>
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_tryDecode(readAsBytesSync(), encoding);
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Future<List<String>> readAsLines({Encoding encoding: UTF8}) =>
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readAsString(encoding: encoding).then(const LineSplitter().convert);
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List<String> readAsLinesSync({Encoding encoding: UTF8}) =>
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const LineSplitter().convert(readAsStringSync(encoding: encoding));
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Future<File> writeAsBytes(List<int> bytes,
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{FileMode mode: FileMode.WRITE,
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bool flush: false}) {
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return open(mode: mode).then((file) {
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return file.writeFrom(bytes, 0, bytes.length)
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.then((_) {
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if (flush) return file.flush().then((_) => this);
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return this;
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})
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.whenComplete(file.close);
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});
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}
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void writeAsBytesSync(List<int> bytes,
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{FileMode mode: FileMode.WRITE,
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bool flush: false}) {
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RandomAccessFile opened = openSync(mode: mode);
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try {
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opened.writeFromSync(bytes, 0, bytes.length);
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if (flush) opened.flushSync();
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} finally {
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opened.closeSync();
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}
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}
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Future<File> writeAsString(String contents,
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{FileMode mode: FileMode.WRITE,
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Encoding encoding: UTF8,
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bool flush: false}) {
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try {
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return writeAsBytes(encoding.encode(contents), mode: mode, flush: flush);
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} catch (e) {
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return new Future.error(e);
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}
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}
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void writeAsStringSync(String contents,
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{FileMode mode: FileMode.WRITE,
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Encoding encoding: UTF8,
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bool flush: false}) {
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writeAsBytesSync(encoding.encode(contents), mode: mode, flush: flush);
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}
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String toString() => "File: '$path'";
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static throwIfError(Object result, String msg, String path) {
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if (result is OSError) {
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throw new FileSystemException(msg, path, result);
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}
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}
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}
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abstract class _RandomAccessFileOps {
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external factory _RandomAccessFileOps(int pointer);
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int getPointer();
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int close();
|
|
readByte();
|
|
read(int bytes);
|
|
readInto(List<int> buffer, int start, int end);
|
|
writeByte(int value);
|
|
writeFrom(List<int> buffer, int start, int end);
|
|
position();
|
|
setPosition(int position);
|
|
truncate(int length);
|
|
length();
|
|
flush();
|
|
lock(int lock, int start, int end);
|
|
}
|
|
|
|
class _RandomAccessFile implements RandomAccessFile {
|
|
static bool _connectedResourceHandler = false;
|
|
|
|
final String path;
|
|
|
|
bool _asyncDispatched = false;
|
|
SendPort _fileService;
|
|
|
|
_FileResourceInfo _resourceInfo;
|
|
_RandomAccessFileOps _ops;
|
|
|
|
_RandomAccessFile(int pointer, this.path) {
|
|
_ops = new _RandomAccessFileOps(pointer);
|
|
_resourceInfo = new _FileResourceInfo(this);
|
|
_maybeConnectHandler();
|
|
}
|
|
|
|
void _maybePerformCleanup() {
|
|
if (closed) {
|
|
_FileResourceInfo.FileClosed(_resourceInfo);
|
|
}
|
|
}
|
|
|
|
_maybeConnectHandler() {
|
|
if (!_connectedResourceHandler) {
|
|
// TODO(ricow): We probably need to set these in some initialization code.
|
|
// We need to make sure that these are always available from the
|
|
// observatory even if no files (or sockets for the socket ones) are
|
|
// open.
|
|
registerExtension('ext.dart.io.getOpenFiles',
|
|
_FileResourceInfo.getOpenFiles);
|
|
registerExtension('ext.dart.io.getFileByID',
|
|
_FileResourceInfo.getFileInfoMapByID);
|
|
_connectedResourceHandler = true;
|
|
}
|
|
}
|
|
|
|
Future<RandomAccessFile> close() {
|
|
return _dispatch(_FILE_CLOSE, [null], markClosed: true).then((result) {
|
|
if (result != -1) {
|
|
closed = closed || (result == 0);
|
|
_maybePerformCleanup();
|
|
return this;
|
|
} else {
|
|
throw new FileSystemException("Cannot close file", path);
|
|
}
|
|
});
|
|
}
|
|
|
|
void closeSync() {
|
|
_checkAvailable();
|
|
var id = _ops.close();
|
|
if (id == -1) {
|
|
throw new FileSystemException("Cannot close file", path);
|
|
}
|
|
closed = closed || (id == 0);
|
|
_maybePerformCleanup();
|
|
}
|
|
|
|
Future<int> readByte() {
|
|
return _dispatch(_FILE_READ_BYTE, [null]).then((response) {
|
|
if (_isErrorResponse(response)) {
|
|
throw _exceptionFromResponse(response, "readByte failed", path);
|
|
}
|
|
_resourceInfo.addRead(1);
|
|
return response;
|
|
});
|
|
}
|
|
|
|
int readByteSync() {
|
|
_checkAvailable();
|
|
var result = _ops.readByte();
|
|
if (result is OSError) {
|
|
throw new FileSystemException("readByte failed", path, result);
|
|
}
|
|
_resourceInfo.addRead(1);
|
|
return result;
|
|
}
|
|
|
|
Future<List<int>> read(int bytes) {
|
|
if (bytes is !int) {
|
|
throw new ArgumentError(bytes);
|
|
}
|
|
return _dispatch(_FILE_READ, [null, bytes]).then((response) {
|
|
if (_isErrorResponse(response)) {
|
|
throw _exceptionFromResponse(response, "read failed", path);
|
|
}
|
|
_resourceInfo.addRead(response[1].length);
|
|
return response[1] as Object/*=List<int>*/;
|
|
});
|
|
}
|
|
|
|
List<int> readSync(int bytes) {
|
|
_checkAvailable();
|
|
if (bytes is !int) {
|
|
throw new ArgumentError(bytes);
|
|
}
|
|
var result = _ops.read(bytes);
|
|
if (result is OSError) {
|
|
throw new FileSystemException("readSync failed", path, result);
|
|
}
|
|
_resourceInfo.addRead(result.length);
|
|
return result as Object/*=List<int>*/;
|
|
}
|
|
|
|
Future<int> readInto(List<int> buffer, [int start = 0, int end]) {
|
|
if ((buffer is !List) ||
|
|
((start != null) && (start is !int)) ||
|
|
((end != null) && (end is !int))) {
|
|
throw new ArgumentError();
|
|
}
|
|
end = RangeError.checkValidRange(start, end, buffer.length);
|
|
if (end == start) {
|
|
return new Future.value(0);
|
|
}
|
|
int length = end - start;
|
|
return _dispatch(_FILE_READ_INTO, [null, length]).then((response) {
|
|
if (_isErrorResponse(response)) {
|
|
throw _exceptionFromResponse(response, "readInto failed", path);
|
|
}
|
|
var read = response[1];
|
|
var data = response[2] as Object/*=List<int>*/;
|
|
buffer.setRange(start, start + read, data);
|
|
_resourceInfo.addRead(read);
|
|
return read;
|
|
});
|
|
}
|
|
|
|
int readIntoSync(List<int> buffer, [int start = 0, int end]) {
|
|
_checkAvailable();
|
|
if ((buffer is !List) ||
|
|
((start != null) && (start is !int)) ||
|
|
((end != null) && (end is !int))) {
|
|
throw new ArgumentError();
|
|
}
|
|
end = RangeError.checkValidRange(start, end, buffer.length);
|
|
if (end == start) {
|
|
return 0;
|
|
}
|
|
var result = _ops.readInto(buffer, start, end);
|
|
if (result is OSError) {
|
|
throw new FileSystemException("readInto failed", path, result);
|
|
}
|
|
_resourceInfo.addRead(result);
|
|
return result;
|
|
}
|
|
|
|
Future<RandomAccessFile> writeByte(int value) {
|
|
if (value is !int) {
|
|
throw new ArgumentError(value);
|
|
}
|
|
return _dispatch(_FILE_WRITE_BYTE, [null, value]).then((response) {
|
|
if (_isErrorResponse(response)) {
|
|
throw _exceptionFromResponse(response, "writeByte failed", path);
|
|
}
|
|
_resourceInfo.addWrite(1);
|
|
return this;
|
|
});
|
|
}
|
|
|
|
int writeByteSync(int value) {
|
|
_checkAvailable();
|
|
if (value is !int) {
|
|
throw new ArgumentError(value);
|
|
}
|
|
var result = _ops.writeByte(value);
|
|
if (result is OSError) {
|
|
throw new FileSystemException("writeByte failed", path, result);
|
|
}
|
|
_resourceInfo.addWrite(1);
|
|
return result;
|
|
}
|
|
|
|
Future<RandomAccessFile> writeFrom(
|
|
List<int> buffer, [int start = 0, int end]) {
|
|
if ((buffer is !List) ||
|
|
((start != null) && (start is !int)) ||
|
|
((end != null) && (end is !int))) {
|
|
throw new ArgumentError("Invalid arguments to writeFrom");
|
|
}
|
|
end = RangeError.checkValidRange(start, end, buffer.length);
|
|
if (end == start) {
|
|
return new Future.value(this);
|
|
}
|
|
_BufferAndStart result;
|
|
try {
|
|
result = _ensureFastAndSerializableByteData(buffer, start, end);
|
|
} catch (e) {
|
|
return new Future.error(e);
|
|
}
|
|
|
|
List request = new List(4);
|
|
request[0] = null;
|
|
request[1] = result.buffer;
|
|
request[2] = result.start;
|
|
request[3] = end - (start - result.start);
|
|
return _dispatch(_FILE_WRITE_FROM, request).then((response) {
|
|
if (_isErrorResponse(response)) {
|
|
throw _exceptionFromResponse(response, "writeFrom failed", path);
|
|
}
|
|
_resourceInfo.addWrite(end - (start - result.start));
|
|
return this;
|
|
});
|
|
}
|
|
|
|
void writeFromSync(List<int> buffer, [int start = 0, int end]) {
|
|
_checkAvailable();
|
|
if ((buffer is !List) ||
|
|
((start != null) && (start is !int)) ||
|
|
((end != null) && (end is !int))) {
|
|
throw new ArgumentError("Invalid arguments to writeFromSync");
|
|
}
|
|
end = RangeError.checkValidRange(start, end, buffer.length);
|
|
if (end == start) {
|
|
return;
|
|
}
|
|
_BufferAndStart bufferAndStart =
|
|
_ensureFastAndSerializableByteData(buffer, start, end);
|
|
var result = _ops.writeFrom(bufferAndStart.buffer,
|
|
bufferAndStart.start,
|
|
end - (start - bufferAndStart.start));
|
|
if (result is OSError) {
|
|
throw new FileSystemException("writeFrom failed", path, result);
|
|
}
|
|
_resourceInfo.addWrite(end - (start - bufferAndStart.start));
|
|
}
|
|
|
|
Future<RandomAccessFile> writeString(String string,
|
|
{Encoding encoding: UTF8}) {
|
|
if (encoding is! Encoding) {
|
|
throw new ArgumentError(encoding);
|
|
}
|
|
var data = encoding.encode(string);
|
|
return writeFrom(data, 0, data.length);
|
|
}
|
|
|
|
void writeStringSync(String string, {Encoding encoding: UTF8}) {
|
|
if (encoding is! Encoding) {
|
|
throw new ArgumentError(encoding);
|
|
}
|
|
var data = encoding.encode(string);
|
|
writeFromSync(data, 0, data.length);
|
|
}
|
|
|
|
Future<int> position() {
|
|
return _dispatch(_FILE_POSITION, [null]).then((response) {
|
|
if (_isErrorResponse(response)) {
|
|
throw _exceptionFromResponse(response, "position failed", path);
|
|
}
|
|
return response;
|
|
});
|
|
}
|
|
|
|
int positionSync() {
|
|
_checkAvailable();
|
|
var result = _ops.position();
|
|
if (result is OSError) {
|
|
throw new FileSystemException("position failed", path, result);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
Future<RandomAccessFile> setPosition(int position) {
|
|
return _dispatch(_FILE_SET_POSITION, [null, position])
|
|
.then((response) {
|
|
if (_isErrorResponse(response)) {
|
|
throw _exceptionFromResponse(response, "setPosition failed", path);
|
|
}
|
|
return this;
|
|
});
|
|
}
|
|
|
|
void setPositionSync(int position) {
|
|
_checkAvailable();
|
|
var result = _ops.setPosition(position);
|
|
if (result is OSError) {
|
|
throw new FileSystemException("setPosition failed", path, result);
|
|
}
|
|
}
|
|
|
|
Future<RandomAccessFile> truncate(int length) {
|
|
return _dispatch(_FILE_TRUNCATE, [null, length]).then((response) {
|
|
if (_isErrorResponse(response)) {
|
|
throw _exceptionFromResponse(response, "truncate failed", path);
|
|
}
|
|
return this;
|
|
});
|
|
}
|
|
|
|
void truncateSync(int length) {
|
|
_checkAvailable();
|
|
var result = _ops.truncate(length);
|
|
if (result is OSError) {
|
|
throw new FileSystemException("truncate failed", path, result);
|
|
}
|
|
}
|
|
|
|
Future<int> length() {
|
|
return _dispatch(_FILE_LENGTH, [null]).then((response) {
|
|
if (_isErrorResponse(response)) {
|
|
throw _exceptionFromResponse(response, "length failed", path);
|
|
}
|
|
return response;
|
|
});
|
|
}
|
|
|
|
int lengthSync() {
|
|
_checkAvailable();
|
|
var result = _ops.length();
|
|
if (result is OSError) {
|
|
throw new FileSystemException("length failed", path, result);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
Future<RandomAccessFile> flush() {
|
|
return _dispatch(_FILE_FLUSH, [null]).then((response) {
|
|
if (_isErrorResponse(response)) {
|
|
throw _exceptionFromResponse(response,
|
|
"flush failed",
|
|
path);
|
|
}
|
|
return this;
|
|
});
|
|
}
|
|
|
|
void flushSync() {
|
|
_checkAvailable();
|
|
var result = _ops.flush();
|
|
if (result is OSError) {
|
|
throw new FileSystemException("flush failed", path, result);
|
|
}
|
|
}
|
|
|
|
static final int LOCK_UNLOCK = 0;
|
|
static final int LOCK_SHARED = 1;
|
|
static final int LOCK_EXCLUSIVE = 2;
|
|
static final int LOCK_BLOCKING_SHARED = 3;
|
|
static final int LOCK_BLOCKING_EXCLUSIVE = 4;
|
|
|
|
int _fileLockValue(FileLock fl) {
|
|
switch (fl) {
|
|
case FileLock.SHARED: return LOCK_SHARED;
|
|
case FileLock.EXCLUSIVE: return LOCK_EXCLUSIVE;
|
|
case FileLock.BLOCKING_SHARED: return LOCK_BLOCKING_SHARED;
|
|
case FileLock.BLOCKING_EXCLUSIVE: return LOCK_BLOCKING_EXCLUSIVE;
|
|
default: return -1;
|
|
}
|
|
}
|
|
|
|
Future<RandomAccessFile> lock(
|
|
[FileLock mode = FileLock.EXCLUSIVE, int start = 0, int end = -1]) {
|
|
if ((mode is !FileLock) || (start is !int) || (end is !int)) {
|
|
throw new ArgumentError();
|
|
}
|
|
if ((start < 0) || (end < -1) || ((end != -1) && (start >= end))) {
|
|
throw new ArgumentError();
|
|
}
|
|
int lock = _fileLockValue(mode);
|
|
return _dispatch(_FILE_LOCK, [null, lock, start, end])
|
|
.then((response) {
|
|
if (_isErrorResponse(response)) {
|
|
throw _exceptionFromResponse(response, 'lock failed', path);
|
|
}
|
|
return this;
|
|
});
|
|
}
|
|
|
|
Future<RandomAccessFile> unlock([int start = 0, int end = -1]) {
|
|
if ((start is !int) || (end is !int)) {
|
|
throw new ArgumentError();
|
|
}
|
|
if (start == end) {
|
|
throw new ArgumentError();
|
|
}
|
|
return _dispatch(_FILE_LOCK, [null, LOCK_UNLOCK, start, end])
|
|
.then((response) {
|
|
if (_isErrorResponse(response)) {
|
|
throw _exceptionFromResponse(response, 'unlock failed', path);
|
|
}
|
|
return this;
|
|
});
|
|
}
|
|
|
|
void lockSync(
|
|
[FileLock mode = FileLock.EXCLUSIVE, int start = 0, int end = -1]) {
|
|
_checkAvailable();
|
|
if ((mode is !FileLock) || (start is !int) || (end is !int)) {
|
|
throw new ArgumentError();
|
|
}
|
|
if ((start < 0) || (end < -1) || ((end != -1) && (start >= end))) {
|
|
throw new ArgumentError();
|
|
}
|
|
int lock = _fileLockValue(mode);
|
|
var result = _ops.lock(lock, start, end);
|
|
if (result is OSError) {
|
|
throw new FileSystemException('lock failed', path, result);
|
|
}
|
|
}
|
|
|
|
void unlockSync([int start = 0, int end = -1]) {
|
|
_checkAvailable();
|
|
if ((start is !int) || (end is !int)) {
|
|
throw new ArgumentError();
|
|
}
|
|
if (start == end) {
|
|
throw new ArgumentError();
|
|
}
|
|
var result = _ops.lock(LOCK_UNLOCK, start, end);
|
|
if (result is OSError) {
|
|
throw new FileSystemException('unlock failed', path, result);
|
|
}
|
|
}
|
|
|
|
bool closed = false;
|
|
|
|
// Calling this function will increase the reference count on the native
|
|
// object that implements the file operations. It should only be called to
|
|
// pass the pointer to the IO Service, which will decrement the reference
|
|
// count when it is finished with it.
|
|
int _pointer() => _ops.getPointer();
|
|
|
|
Future _dispatch(int request, List data, { bool markClosed: false }) {
|
|
if (closed) {
|
|
return new Future.error(new FileSystemException("File closed", path));
|
|
}
|
|
if (_asyncDispatched) {
|
|
var msg = "An async operation is currently pending";
|
|
return new Future.error(new FileSystemException(msg, path));
|
|
}
|
|
if (markClosed) {
|
|
// Set closed to true to ensure that no more async requests can be issued
|
|
// for this file.
|
|
closed = true;
|
|
}
|
|
_asyncDispatched = true;
|
|
data[0] = _pointer();
|
|
return _IOService._dispatch(request, data)
|
|
.whenComplete(() {
|
|
_asyncDispatched = false;
|
|
});
|
|
}
|
|
|
|
void _checkAvailable() {
|
|
if (_asyncDispatched) {
|
|
throw new FileSystemException("An async operation is currently pending",
|
|
path);
|
|
}
|
|
if (closed) {
|
|
throw new FileSystemException("File closed", path);
|
|
}
|
|
}
|
|
}
|