| /* |
| * Copyright 2012 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| * use this file except in compliance with the License. You may obtain a copy of |
| * the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| * License for the specific language governing permissions and limitations under |
| * the License. |
| */ |
| package com.google.gwt.typedarrays.server; |
| |
| import com.google.gwt.typedarrays.shared.ArrayBuffer; |
| |
| import java.nio.ByteBuffer; |
| import java.nio.ByteOrder; |
| |
| /** |
| * Pure Java implementation of {@link ArrayBuffer}, plus package-protected methods |
| * for use by related implementation classes. |
| */ |
| public class ArrayBufferImpl implements ArrayBuffer { |
| |
| private final Object lock = new Object(); |
| |
| private final ByteBuffer buf; |
| |
| /** |
| * @param length |
| */ |
| public ArrayBufferImpl(int length) { |
| buf = ByteBuffer.allocate(length); |
| // JS lets native byte order show through, which is typically little-endian |
| // so if there is code that incorrectly assumes anything, it will be |
| // little-endian. |
| buf.order(ByteOrder.LITTLE_ENDIAN); |
| } |
| |
| @Override |
| public int byteLength() { |
| return buf.capacity(); |
| } |
| |
| float getFloat32(int byteOffset, boolean littleEndian) { |
| synchronized (lock) { |
| try { |
| if (!littleEndian) { |
| buf.order(ByteOrder.BIG_ENDIAN); |
| } |
| return buf.getFloat(byteOffset); |
| } finally { |
| if (!littleEndian) { |
| buf.order(ByteOrder.LITTLE_ENDIAN); |
| } |
| } |
| } |
| } |
| |
| double getFloat64(int byteOffset, boolean littleEndian) { |
| synchronized (lock) { |
| try { |
| if (!littleEndian) { |
| buf.order(ByteOrder.BIG_ENDIAN); |
| } |
| return buf.getDouble(byteOffset); |
| } finally { |
| if (!littleEndian) { |
| buf.order(ByteOrder.LITTLE_ENDIAN); |
| } |
| } |
| } |
| } |
| |
| short getInt16(int byteOffset, boolean littleEndian) { |
| synchronized (lock) { |
| try { |
| if (!littleEndian) { |
| buf.order(ByteOrder.BIG_ENDIAN); |
| } |
| return buf.getShort(byteOffset); |
| } finally { |
| if (!littleEndian) { |
| buf.order(ByteOrder.LITTLE_ENDIAN); |
| } |
| } |
| } |
| } |
| |
| int getInt32(int byteOffset, boolean littleEndian) { |
| synchronized (lock) { |
| try { |
| if (!littleEndian) { |
| buf.order(ByteOrder.BIG_ENDIAN); |
| } |
| return buf.getInt(byteOffset); |
| } finally { |
| if (!littleEndian) { |
| buf.order(ByteOrder.LITTLE_ENDIAN); |
| } |
| } |
| } |
| } |
| |
| byte getInt8(int byteOffset) { |
| return buf.get(byteOffset); |
| } |
| |
| void setFloat32(int byteOffset, float value, boolean littleEndian) { |
| synchronized (lock) { |
| try { |
| if (!littleEndian) { |
| buf.order(ByteOrder.BIG_ENDIAN); |
| } |
| buf.putFloat(byteOffset, value); |
| } finally { |
| if (!littleEndian) { |
| buf.order(ByteOrder.LITTLE_ENDIAN); |
| } |
| } |
| } |
| } |
| |
| void setFloat64(int byteOffset, double value, boolean littleEndian) { |
| synchronized (lock) { |
| try { |
| if (!littleEndian) { |
| buf.order(ByteOrder.BIG_ENDIAN); |
| } |
| buf.putDouble(byteOffset, value); |
| } finally { |
| if (!littleEndian) { |
| buf.order(ByteOrder.LITTLE_ENDIAN); |
| } |
| } |
| } |
| } |
| |
| void setInt16(int byteOffset, short value, boolean littleEndian) { |
| synchronized (lock) { |
| try { |
| if (!littleEndian) { |
| buf.order(ByteOrder.BIG_ENDIAN); |
| } |
| buf.putShort(byteOffset, value); |
| } finally { |
| if (!littleEndian) { |
| buf.order(ByteOrder.LITTLE_ENDIAN); |
| } |
| } |
| } |
| } |
| |
| void setInt32(int byteOffset, int value, boolean littleEndian) { |
| synchronized (lock) { |
| try { |
| if (!littleEndian) { |
| buf.order(ByteOrder.BIG_ENDIAN); |
| } |
| buf.putInt(byteOffset, value); |
| } finally { |
| if (!littleEndian) { |
| buf.order(ByteOrder.LITTLE_ENDIAN); |
| } |
| } |
| } |
| } |
| |
| void setInt8(int byteOffset, byte value) { |
| buf.put(byteOffset, value); |
| } |
| } |