Add an external array type to support typed arrays.

runtime/lib/byte_buffer.dart

Index: runtime/lib/byte_buffer.dart
diff --git a/runtime/lib/byte_buffer.dart b/runtime/lib/byte_buffer.dart
new file mode 100644
index 0000000000000000000000000000000000000000..ed27751615413fc9cd0079c377222d16d2d0fa68
--- /dev/null
+++ b/runtime/lib/byte_buffer.dart
@@ -0,0 +1,222 @@
+// Copyright (c) 2011, 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.
+
+class ByteBuffer implements List {
+  factory ByteBuffer(int length) {
+    return _allocate(length);
+  }
+
+  int getInt8(int byteOffset) {
+    return _getInt8(byteOffset);
+  }
+  void setInt8(int byteOffset, int value) {
+    _setInt8(byteOffset, value);
+  }
+
+  int getUint8(int byteOffset) {
+    return _getUint8(byteOffset);
+  }
+  void setUint8(int byteOffset, int value) {
+    _setUint8(byteOffset, value);
+  }
+
+  int getInt16(int byteOffset) {
+    return _getInt16(byteOffset);
+  }
+  void setInt16(int byteOffset, int value) {
+    _setInt16(byteOffset, value);
+  }
+
+  int getUint16(int byteOffset) {
+    return _getInt16(byteOffset);
+  }
+  void setUint16(int byteOffset, int value) {
+    _setUint16(byteOffset, value);
+  }
+
+  int getInt32(int byteOffset) {
+    return _getInt32(byteOffset);
+  }
+  void setInt32(int byteOffset, int value) {
+    _setInt32(byteOffset, value);
+  }
+
+  int getUint32(int byteOffset) {
+    return _getUint32(byteOffset);
+  }
+  void setUint32(int byteOffset, int value) {
+    _setUint32(byteOffset, value);
+  }
+
+  int getInt64(int byteOffset) {
+    return _getInt64(byteOffset);
+  }
+  void setInt64(int byteOffset, int value) {
+    _setInt64(byteOffset, value);
+  }
+
+  int getUint64(int byteOffset) {
+    return _getUint64(byteOffset);
+  }
+  void setUint64(int byteOffset, int value) {
+    _setUint64(byteOffset, value);
+  }
+
+  double getFloat32(int byteOffset) {
+    return _getFloat32(byteOffset);
+  }
+  void setFloat32(int byteOffset, double value) {
+    _setFloat32(byteOffset, value);
+  }
+
+  double getFloat64(int byteOffset) {
+    return _getFloat64(byteOffset);
+  }
+  void setFloat64(int byteOffset, double value) {
+    _setFloat64(byteOffset, value);
+  }
+
+  // Iterable interface
+
+  Iterator iterator() {
+    return new ByteBufferIterator(this);
+  }
+
+  // Collection interface
+
+  int get length() {
+    return _length();
+  }
+
+  bool every(bool f(int element)) {
+    return Collections.every(this, f);
+  }
+
+  Collection filter(bool f(int element)) {
+    return Collections.filter(this, new GrowableObjectArray(), f);
+  }
+
+  void forEach(f(int element)) {
+    Collections.forEach(this, f);
+  }
+
+  bool isEmpty() {
+    return this.length === 0;
+  }
+
+  bool some(bool f(int element)) {
+    return Collections.some(this, f);
+  }
+
+  // List interface
+
+  int operator[](int index) {
+    return _getUint8(index);
+  }
+
+  void operator[]=(int index, int value) {
+    _setUint8(index, value);
+  }
+
+  void set length(int newLength) {
+    throw const UnsupportedOperationException("Cannot add to a byte buffer");
+  }
+
+  void add(int element) {
+    throw const UnsupportedOperationException("Cannot add to a byte buffer");
+  }
+
+  void addLast(int element) {
+    add(element);
+  }
+
+  void addAll(Collection elements) {
+    throw const UnsupportedOperationException("Cannot add to a byte buffer");
+  }
+
+  void sort(int compare(int a,  b)) {
+    DualPivotQuicksort.sort(this, compare);
+  }
+
+  int indexOf(int element, [int start = 0]) {
+    return Arrays.indexOf(this, element, start, this.length);
+  }
+
+  int lastIndexOf(int element, [int start = null]) {
+    if (start === null) start = length - 1;
+    return Arrays.lastIndexOf(this, element, start);
+  }
+
+  void clear() {
+    throw const UnsupportedOperationException("Cannot clear a byte buffer");
+  }
+
+  int removeLast() {
+    throw const UnsupportedOperationException(
+      "Cannot remove from a byte buffer");
+  }
+
+  int last() {
+    return this[length - 1];
+  }
+
+  // Implementation
+
+  static ByteBuffer _allocate(int length) native "ByteBuffer_allocate";
+
+  int _length() native "ByteBuffer_getLength";
+
+  int _getInt8(int byteOffset) native "ByteBuffer_getInt8";
+  void _setInt8(int byteOffset, int value) native "ByteBuffer_setInt8";
+
+  int _getUint8(int byteOffset) native "ByteBuffer_getUint8";
+  void _setUint8(int byteOffset, int value) native "ByteBuffer_setUint8";
+
+  int _getInt16(int byteOffset) native "ByteBuffer_getInt16";
+  void _setInt16(int byteOffset, int value) native "ByteBuffer_setInt16";
+
+  int _getUint16(int byteOffset) native "ByteBuffer_getUint16";
+  void _setUint16(int byteOffset, int value) native "ByteBuffer_setUint16";
+
+  int _getInt32(int byteOffset) native "ByteBuffer_getInt32";
+  void _setInt32(int byteOffset, int value) native "ByteBuffer_setInt32";
+
+  int _getUint32(int byteOffset) native "ByteBuffer_getUint32";
+  void _setUint32(int byteOffset, int value) native "ByteBuffer_setUint32";
+
+  int _getInt64(int byteOffset) native "ByteBuffer_getInt64";
+  void _setInt64(int byteOffset, int value) native "ByteBuffer_setInt64";
+
+  int _getUint64(int byteOffset) native "ByteBuffer_getUint64";
+  void _setUint64(int byteOffset, int value) native "ByteBuffer_setUint64";
+
+  double _getFloat32(int byteOffset) native "ByteBuffer_getFloat32";
+  void _setFloat32(int byteOffset, double value) native "ByteBuffer_setFloat32";
+
+  double _getFloat64(int byteOffset) native "ByteBuffer_getFloat64";
+  void _setFloat64(int byteOffset, double value) native "ByteBuffer_setFloat64";
+}
+
+
+class ByteBufferIterator implements Iterator {
+  ByteBufferIterator(List byteBuffer)
+      : _byteBuffer = byteBuffer, _length = byteBuffer.length, _pos = 0 {
+    assert(byteBuffer is ByteBuffer);
+  }
+
+  bool hasNext() {
+   return _length > _pos;
+  }
+
+  int next() {
+    if (!hasNext()) {
+      throw const NoMoreElementsException();
+    }
+    return _byteBuffer[_pos++];
+  }
+
+  final List _byteBuffer;
+  final int _length;  // Cache byte buffer length for faster access.
+  int _pos;
+}