Remove _BufferList from dart:io and now use BytesBuilder.

sdk/lib/io/buffer_list.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.
-
-part of dart.io;
-
-/**
- * Utility class that can fast concatenate [List<int>]s of bytes. Use
- * [readBytes] to get the final buffer.
- */
-class _BufferList {
-  static const int _INIT_SIZE = 1 * 1024;
-
-  _BufferList() {
-    clear();
-  }
-
-  int pow2roundup(int x) {
-    --x;
-    x |= x >> 1;
-    x |= x >> 2;
-    x |= x >> 4;
-    x |= x >> 8;
-    x |= x >> 16;
-    return x + 1;
-  }
-
-  /**
-   * Adds a new buffer to the list.
-   */
-  void add(List<int> buffer) {
-    int bufferLength = buffer.length;
-    int required = _length + bufferLength;
-    if (_buffer == null) {
-      int size = pow2roundup(required);
-      if (size < _INIT_SIZE) size = _INIT_SIZE;
-      _buffer = new Uint8List(size);
-    } else if (_buffer.length < required) {
-      // This will give is a list in the range of 2-4 times larger than
-      // required.
-      int size = pow2roundup(required) * 2;
-      Uint8List newBuffer = new Uint8List(size);
-      newBuffer.setRange(0, _buffer.length, _buffer);
-      _buffer = newBuffer;
-    }
-    assert(_buffer.length >= required);
-    if (buffer is Uint8List) {
-      _buffer.setRange(_length, required, buffer);
-    } else {
-      for (int i = 0; i < bufferLength; i++) {
-        _buffer[_length + i] = buffer[i];
-      }
-    }
-    _length = required;
-  }
-
-  /**
-   * Same as [add].
-   */
-  void write(List<int> buffer) {
-    add(buffer);
-  }
-
-  /**
-   * Read all the bytes from the buffer list. If it's empty, an empty list
-   * is returned. A call to [readBytes] will clear the buffer.
-   */
-  List<int> readBytes() {
-    if (_buffer == null) return new Uint8List(0);
-    var buffer = new Uint8List.view(_buffer.buffer, 0, _length);
-    clear();
-    return buffer;
-  }
-
-  /**
-   * Returns the total number of bytes in the buffer.
-   */
-  int get length => _length;
-
-  /**
-   * Returns whether the buffer list is empty.
-   */
-  bool get isEmpty => _length == 0;
-
-  /**
-   * Returns whether the buffer list is not empty.
-   */
-  bool get isNotEmpty => !isEmpty;
-
-  /**
-   * Clears the content of the buffer list.
-   */
-  void clear() {
-    _length = 0;
-    _buffer = null;
-  }
-
-  int _length;  // Total number of bytes in the buffer.
-  Uint8List _buffer;  // Internal buffer.
-}