Use patching for dart:io.

runtime/bin/output_stream.dart

-// Copyright (c) 2012, 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.
-
-/**
- * Output streams are used to write data sequentially to a data
- * destination e.g. a connected socket or an open file.
- *
- * An output stream provides internal buffering of the data written
- * through all calls to [write] and [writeFrom] if data cannot be
- * written immediately to the communication channel. The callback set
- * through [onNoPendingWrites] can be used to to keep the rate of
- * writing in sync with the rate the system can actually write data to
- * the underlying communication channel.
- */
-abstract class OutputStream {
-  /**
-   * Writes the content of [buffer] to the stream. If [copyBuffer] is
-   * false ownership of the specified buffer is passed to the system
-   * and the caller should not change it afterwards. The default value
-   * for [copyBuffer] is true.
-   *
-   * Returns true if the data could be written to the underlying
-   * communication channel immediately. Otherwise the data is buffered
-   * by the output stream and will be sent as soon as possible.
-   */
-  bool write(List<int> buffer, [bool copyBuffer]);
-
-  /**
-   * Writes [len] bytes from buffer [buffer] starting at offset
-   * [offset] to the output stream. If [offset] is not specified the
-   * default is 0. If [len] is not specified the default is the length
-   * of the buffer minus [offset] (i.e. writing from offset to the end
-   * of the buffer). The system will copy the data to be written so
-   * the caller can safely change [buffer] afterwards.
-   *
-   * Returns true if the data could be written to the underlying
-   * communication channel immediately. Otherwise the data is buffered
-   * by the output stream and will be sent as soon as possible.
-   */
-  bool writeFrom(List<int> buffer, [int offset, int len]);
-
-  /**
-   * Write a string to the stream using the given [encoding].The
-   * default encoding is UTF-8 - [:Encoding.UTF_8:].
-   *
-   * Returns true if the data could be written to the underlying
-   * communication channel immediately. Otherwise the data is buffered
-   * by the output stream and will be sent as soon as possible.
-   */
-  bool writeString(String string, [Encoding encoding]);
-
-  /**
-   * Flushes data from any internal buffers as soon as possible. Note
-   * that the actual meaning of calling [flush] will depend on the
-   * actual type of the underlying communication channel.
-   */
-  void flush();
-
-  /**
-   * Signal that no more data will be written to the output stream. When all
-   * buffered data has been written out to the communication channel, the
-   * channel will be closed and the [onClosed] callback will be called.
-   */
-  void close();
-
-  /**
-   * Close the communication channel immediately ignoring any buffered
-   * data.
-   */
-  void destroy();
-
-  /**
-   * Returns whether the stream has been closed by calling close(). If true, no
-   * more data may be written to the output stream, but there still may be
-   * buffered data that has not been written to the communication channel. The
-   * onClosed handler will only be called once all data has been written out.
-   */
-  bool get closed;
-
-  /**
-   * Sets the handler that gets called when the internal OS buffers
-   * have been flushed. This callback can be used to keep the rate of
-   * writing in sync with the rate the system can write data to the
-   * underlying communication channel.
-   */
-  void set onNoPendingWrites(void callback());
-
-  /**
-   * Sets the handler that gets called when the underlying communication channel
-   * has been closed and all the buffered data has been sent.
-   */
-  void set onClosed(void callback());
-
-  /**
-   * Sets the handler that gets called when the underlying
-   * communication channel gets into some kind of error situation.
-   */
-  void set onError(void callback(e));
-}
-