| // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| part of dart.io; |
| |
| // Read the file in blocks of size 64k. |
| const int _BLOCK_SIZE = 64 * 1024; |
| |
| |
| class _FileStream extends Stream<List<int>> { |
| // Stream controller. |
| StreamController<List<int>> _controller; |
| |
| // Information about the underlying file. |
| String _path; |
| RandomAccessFile _openedFile; |
| int _position; |
| int _end; |
| final Completer _closeCompleter = new Completer(); |
| |
| // Has the stream been paused or unsubscribed? |
| bool _unsubscribed = false; |
| |
| // Is there a read currently in progress? |
| bool _readInProgress = true; |
| bool _closed = false; |
| |
| bool _atEnd = false; |
| |
| _FileStream(this._path, this._position, this._end) { |
| if (_position == null) _position = 0; |
| } |
| |
| _FileStream.forStdin() : _position = 0; |
| |
| StreamSubscription<List<int>> listen(void onData(List<int> event), |
| {Function onError, |
| void onDone(), |
| bool cancelOnError}) { |
| _setupController(); |
| return _controller.stream.listen(onData, |
| onError: onError, |
| onDone: onDone, |
| cancelOnError: cancelOnError); |
| } |
| |
| void _setupController() { |
| _controller = new StreamController<List<int>>(sync: true, |
| onListen: _start, |
| onResume: _readBlock, |
| onCancel: () { |
| _unsubscribed = true; |
| return _closeFile(); |
| }); |
| } |
| |
| Future _closeFile() { |
| if (_readInProgress || _closed) { |
| return _closeCompleter.future; |
| } |
| _closed = true; |
| |
| void done() { |
| _closeCompleter.complete(); |
| _controller.close(); |
| } |
| |
| _openedFile.close() |
| .catchError(_controller.addError) |
| .whenComplete(done); |
| return _closeCompleter.future; |
| } |
| |
| void _readBlock() { |
| // Don't start a new read if one is already in progress. |
| if (_readInProgress) return; |
| if (_atEnd) { |
| _closeFile(); |
| return; |
| } |
| _readInProgress = true; |
| int readBytes = _BLOCK_SIZE; |
| if (_end != null) { |
| readBytes = min(readBytes, _end - _position); |
| if (readBytes < 0) { |
| _readInProgress = false; |
| if (!_unsubscribed) { |
| _controller.addError(new RangeError("Bad end position: $_end")); |
| _closeFile(); |
| _unsubscribed = true; |
| } |
| return; |
| } |
| } |
| _openedFile.read(readBytes) |
| .then((block) { |
| _readInProgress = false; |
| if (_unsubscribed) { |
| _closeFile(); |
| return; |
| } |
| _position += block.length; |
| if (block.length < readBytes || |
| (_end != null && _position == _end)) { |
| _atEnd = true; |
| } |
| if (!_atEnd && !_controller.isPaused) { |
| _readBlock(); |
| } |
| _controller.add(block); |
| if (_atEnd) { |
| _closeFile(); |
| } |
| }) |
| .catchError((e, s) { |
| if (!_unsubscribed) { |
| _controller.addError(e, s); |
| _closeFile(); |
| _unsubscribed = true; |
| } |
| }); |
| } |
| |
| void _start() { |
| if (_position < 0) { |
| _controller.addError(new RangeError("Bad start position: $_position")); |
| _controller.close(); |
| _closeCompleter.complete(); |
| return; |
| } |
| |
| void onReady(RandomAccessFile file) { |
| _openedFile = file; |
| _readInProgress = false; |
| _readBlock(); |
| } |
| |
| void onOpenFile(RandomAccessFile file) { |
| if (_position > 0) { |
| file.setPosition(_position) |
| .then(onReady, onError: (e, s) { |
| _controller.addError(e, s); |
| _readInProgress = false; |
| _closeFile(); |
| }); |
| } else { |
| onReady(file); |
| } |
| } |
| |
| void openFailed(error, stackTrace) { |
| _controller.addError(error, stackTrace); |
| _controller.close(); |
| _closeCompleter.complete(); |
| } |
| |
| if (_path != null) { |
| new File(_path).open(mode: FileMode.READ) |
| .then(onOpenFile, onError: openFailed); |
| } else { |
| try { |
| onOpenFile(_File._openStdioSync(0)); |
| } catch (e, s) { |
| openFailed(e, s); |
| } |
| } |
| } |
| } |
| |
| class _FileStreamConsumer extends StreamConsumer<List<int>> { |
| File _file; |
| Future<RandomAccessFile> _openFuture; |
| |
| _FileStreamConsumer(File this._file, FileMode mode) { |
| _openFuture = _file.open(mode: mode); |
| } |
| |
| _FileStreamConsumer.fromStdio(int fd) { |
| assert(1 <= fd && fd <= 2); |
| _openFuture = new Future.value(_File._openStdioSync(fd)); |
| } |
| |
| Future<File> addStream(Stream<List<int>> stream) { |
| Completer<File> completer = new Completer<File>.sync(); |
| _openFuture |
| .then((openedFile) { |
| var _subscription; |
| void error(e, [StackTrace stackTrace]) { |
| _subscription.cancel(); |
| openedFile.close(); |
| completer.completeError(e, stackTrace); |
| } |
| _subscription = stream.listen( |
| (d) { |
| _subscription.pause(); |
| try { |
| openedFile.writeFrom(d, 0, d.length) |
| .then((_) => _subscription.resume(), |
| onError: error); |
| } catch (e, stackTrace) { |
| error(e, stackTrace); |
| } |
| }, |
| onDone: () { |
| completer.complete(_file); |
| }, |
| onError: error, |
| cancelOnError: true); |
| }) |
| .catchError(completer.completeError); |
| return completer.future; |
| } |
| |
| Future<File> close() => |
| _openFuture.then/*<File>*/((openedFile) => openedFile.close()); |
| } |
| |
| |
| // Class for encapsulating the native implementation of files. |
| class _File extends FileSystemEntity implements File { |
| final String path; |
| |
| // Constructor for file. |
| _File(this.path) { |
| if (path is! String) { |
| throw new ArgumentError('${Error.safeToString(path)} ' |
| 'is not a String'); |
| } |
| } |
| |
| Future<bool> exists() { |
| return _IOService._dispatch(_FILE_EXISTS, [path]).then((response) { |
| if (_isErrorResponse(response)) { |
| throw _exceptionFromResponse(response, "Cannot check existence", path); |
| } |
| return response; |
| }); |
| } |
| |
| external static _exists(String path); |
| |
| bool existsSync() { |
| var result = _exists(path); |
| throwIfError(result, "Cannot check existence of file", path); |
| return result; |
| } |
| |
| File get absolute => new File(_absolutePath); |
| |
| Future<FileStat> stat() => FileStat.stat(path); |
| |
| FileStat statSync() => FileStat.statSync(path); |
| |
| Future<File> create({bool recursive: false}) { |
| var result = recursive ? parent.create(recursive: true) |
| : new Future.value(null); |
| return result |
| .then((_) => _IOService._dispatch(_FILE_CREATE, [path])) |
| .then((response) { |
| if (_isErrorResponse(response)) { |
| throw _exceptionFromResponse(response, "Cannot create file", path); |
| } |
| return this; |
| }); |
| } |
| |
| external static _create(String path); |
| |
| external static _createLink(String path, String target); |
| |
| external static _linkTarget(String path); |
| |
| void createSync({bool recursive: false}) { |
| if (recursive) { |
| parent.createSync(recursive: true); |
| } |
| var result = _create(path); |
| throwIfError(result, "Cannot create file", path); |
| } |
| |
| Future<File> _delete({bool recursive: false}) { |
| if (recursive) { |
| return new Directory(path).delete(recursive: true).then((_) => this); |
| } |
| return _IOService._dispatch(_FILE_DELETE, [path]).then((response) { |
| if (_isErrorResponse(response)) { |
| throw _exceptionFromResponse(response, "Cannot delete file", path); |
| } |
| return this; |
| }); |
| } |
| |
| external static _deleteNative(String path); |
| |
| external static _deleteLinkNative(String path); |
| |
| void _deleteSync({bool recursive: false}) { |
| if (recursive) { |
| return new Directory(path).deleteSync(recursive: true); |
| } |
| var result = _deleteNative(path); |
| throwIfError(result, "Cannot delete file", path); |
| } |
| |
| Future<File> rename(String newPath) { |
| return _IOService._dispatch(_FILE_RENAME, [path, newPath]).then((response) { |
| if (_isErrorResponse(response)) { |
| throw _exceptionFromResponse( |
| response, "Cannot rename file to '$newPath'", path); |
| } |
| return new File(newPath); |
| }); |
| } |
| |
| external static _rename(String oldPath, String newPath); |
| |
| external static _renameLink(String oldPath, String newPath); |
| |
| File renameSync(String newPath) { |
| var result = _rename(path, newPath); |
| throwIfError(result, "Cannot rename file to '$newPath'", path); |
| return new File(newPath); |
| } |
| |
| Future<File> copy(String newPath) { |
| return _IOService._dispatch(_FILE_COPY, [path, newPath]).then((response) { |
| if (_isErrorResponse(response)) { |
| throw _exceptionFromResponse( |
| response, "Cannot copy file to '$newPath'", path); |
| } |
| return new File(newPath); |
| }); |
| } |
| |
| external static _copy(String oldPath, String newPath); |
| |
| File copySync(String newPath) { |
| var result = _copy(path, newPath); |
| throwIfError(result, "Cannot copy file to '$newPath'", path); |
| return new File(newPath); |
| } |
| |
| Future<RandomAccessFile> open({FileMode mode: FileMode.READ}) { |
| if (mode != FileMode.READ && |
| mode != FileMode.WRITE && |
| mode != FileMode.APPEND && |
| mode != FileMode.WRITE_ONLY && |
| mode != FileMode.WRITE_ONLY_APPEND) { |
| return new Future.error( |
| new ArgumentError('Invalid file mode for this operation')); |
| } |
| return _IOService._dispatch(_FILE_OPEN, [path, mode._mode]) |
| .then((response) { |
| if (_isErrorResponse(response)) { |
| throw _exceptionFromResponse(response, "Cannot open file", path); |
| } |
| return new _RandomAccessFile(response, path); |
| }); |
| } |
| |
| Future<int> length() { |
| return _IOService._dispatch(_FILE_LENGTH_FROM_PATH, [path]) |
| .then((response) { |
| if (_isErrorResponse(response)) { |
| throw _exceptionFromResponse(response, |
| "Cannot retrieve length of file", |
| path); |
| } |
| return response; |
| }); |
| } |
| |
| |
| external static _lengthFromPath(String path); |
| |
| int lengthSync() { |
| var result = _lengthFromPath(path); |
| throwIfError(result, "Cannot retrieve length of file", path); |
| return result; |
| } |
| |
| Future<DateTime> lastModified() { |
| return _IOService._dispatch(_FILE_LAST_MODIFIED, [path]).then((response) { |
| if (_isErrorResponse(response)) { |
| throw _exceptionFromResponse(response, |
| "Cannot retrieve modification time", |
| path); |
| } |
| return new DateTime.fromMillisecondsSinceEpoch(response); |
| }); |
| } |
| |
| external static _lastModified(String path); |
| |
| DateTime lastModifiedSync() { |
| var ms = _lastModified(path); |
| throwIfError(ms, "Cannot retrieve modification time", path); |
| return new DateTime.fromMillisecondsSinceEpoch(ms); |
| } |
| |
| external static _open(String path, int mode); |
| |
| RandomAccessFile openSync({FileMode mode: FileMode.READ}) { |
| if (mode != FileMode.READ && |
| mode != FileMode.WRITE && |
| mode != FileMode.APPEND && |
| mode != FileMode.WRITE_ONLY && |
| mode != FileMode.WRITE_ONLY_APPEND) { |
| throw new ArgumentError('Invalid file mode for this operation'); |
| } |
| var id = _open(path, mode._mode); |
| throwIfError(id, "Cannot open file", path); |
| return new _RandomAccessFile(id, path); |
| } |
| |
| external static int _openStdio(int fd); |
| |
| static RandomAccessFile _openStdioSync(int fd) { |
| var id = _openStdio(fd); |
| if (id == 0) { |
| throw new FileSystemException("Cannot open stdio file for: $fd"); |
| } |
| return new _RandomAccessFile(id, ""); |
| } |
| |
| Stream<List<int>> openRead([int start, int end]) { |
| return new _FileStream(path, start, end); |
| } |
| |
| IOSink openWrite({FileMode mode: FileMode.WRITE, |
| Encoding encoding: UTF8}) { |
| if (mode != FileMode.WRITE && |
| mode != FileMode.APPEND && |
| mode != FileMode.WRITE_ONLY && |
| mode != FileMode.WRITE_ONLY_APPEND) { |
| throw new ArgumentError('Invalid file mode for this operation'); |
| } |
| var consumer = new _FileStreamConsumer(this, mode); |
| return new IOSink(consumer, encoding: encoding); |
| } |
| |
| Future<List<int>> readAsBytes() { |
| Future<List<int>> readDataChunked(RandomAccessFile file) { |
| var builder = new BytesBuilder(copy: false); |
| var completer = new Completer<List<int>>(); |
| void read() { |
| file.read(_BLOCK_SIZE).then((data) { |
| if (data.length > 0) { |
| builder.add(data); |
| read(); |
| } else { |
| completer.complete(builder.takeBytes()); |
| } |
| }, onError: completer.completeError); |
| } |
| read(); |
| return completer.future; |
| } |
| |
| return open().then((file) { |
| return file.length().then((length) { |
| if (length == 0) { |
| // May be character device, try to read it in chunks. |
| return readDataChunked(file); |
| } |
| return file.read(length); |
| }).whenComplete(file.close); |
| }); |
| } |
| |
| List<int> readAsBytesSync() { |
| var opened = openSync(); |
| try { |
| List<int> data; |
| var length = opened.lengthSync(); |
| if (length == 0) { |
| // May be character device, try to read it in chunks. |
| var builder = new BytesBuilder(copy: false); |
| do { |
| data = opened.readSync(_BLOCK_SIZE); |
| if (data.length > 0) builder.add(data); |
| } while (data.length > 0); |
| data = builder.takeBytes(); |
| } else { |
| data = opened.readSync(length); |
| } |
| return data; |
| } finally { |
| opened.closeSync(); |
| } |
| } |
| |
| String _tryDecode(List<int> bytes, Encoding encoding) { |
| try { |
| return encoding.decode(bytes); |
| } catch (_) { |
| throw new FileSystemException( |
| "Failed to decode data using encoding '${encoding.name}'", path); |
| } |
| } |
| |
| Future<String> readAsString({Encoding encoding: UTF8}) => |
| readAsBytes().then((bytes) => _tryDecode(bytes, encoding)); |
| |
| String readAsStringSync({Encoding encoding: UTF8}) => |
| _tryDecode(readAsBytesSync(), encoding); |
| |
| Future<List<String>> readAsLines({Encoding encoding: UTF8}) => |
| readAsString(encoding: encoding).then(const LineSplitter().convert); |
| |
| List<String> readAsLinesSync({Encoding encoding: UTF8}) => |
| const LineSplitter().convert(readAsStringSync(encoding: encoding)); |
| |
| Future<File> writeAsBytes(List<int> bytes, |
| {FileMode mode: FileMode.WRITE, |
| bool flush: false}) { |
| return open(mode: mode).then((file) { |
| return file.writeFrom(bytes, 0, bytes.length) |
| .then((_) { |
| if (flush) return file.flush().then((_) => this); |
| return this; |
| }) |
| .whenComplete(file.close); |
| }); |
| } |
| |
| void writeAsBytesSync(List<int> bytes, |
| {FileMode mode: FileMode.WRITE, |
| bool flush: false}) { |
| RandomAccessFile opened = openSync(mode: mode); |
| try { |
| opened.writeFromSync(bytes, 0, bytes.length); |
| if (flush) opened.flushSync(); |
| } finally { |
| opened.closeSync(); |
| } |
| } |
| |
| Future<File> writeAsString(String contents, |
| {FileMode mode: FileMode.WRITE, |
| Encoding encoding: UTF8, |
| bool flush: false}) { |
| try { |
| return writeAsBytes(encoding.encode(contents), mode: mode, flush: flush); |
| } catch (e) { |
| return new Future.error(e); |
| } |
| } |
| |
| void writeAsStringSync(String contents, |
| {FileMode mode: FileMode.WRITE, |
| Encoding encoding: UTF8, |
| bool flush: false}) { |
| writeAsBytesSync(encoding.encode(contents), mode: mode, flush: flush); |
| } |
| |
| String toString() => "File: '$path'"; |
| |
| static throwIfError(Object result, String msg, String path) { |
| if (result is OSError) { |
| throw new FileSystemException(msg, path, result); |
| } |
| } |
| } |
| |
| abstract class _RandomAccessFileOps { |
| external factory _RandomAccessFileOps(int pointer); |
| |
| int getPointer(); |
| 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; |
| |
| 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 = (mode == FileLock.EXCLUSIVE) ? LOCK_EXCLUSIVE : LOCK_SHARED; |
| 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 = (mode == FileLock.EXCLUSIVE) ? LOCK_EXCLUSIVE : LOCK_SHARED; |
| 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); |
| } |
| } |
| } |