| /* |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 flash.swf; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.OutputStream; |
| import java.io.IOException; |
| |
| /** |
| * Extends ByteArrayOutputStream by adding support for a position. |
| */ |
| public class RandomAccessBuffer extends ByteArrayOutputStream |
| { |
| protected int pos = 0; |
| |
| /** |
| * Init an 1k buffer (BAOS default is 32 bytes, so this should be better) |
| */ |
| public RandomAccessBuffer() |
| { |
| super(1024); |
| } |
| |
| public RandomAccessBuffer(int bufferSize) |
| { |
| super(bufferSize); |
| } |
| |
| final public int getPos() |
| { |
| return pos; |
| } |
| |
| final public void setPos(int pos) |
| { |
| this.pos = pos; |
| } |
| |
| // we override this so we can declare the signature w/out any exceptions |
| final public synchronized void write(byte[] b) |
| { |
| this.write(b, 0, b.length); |
| } |
| |
| final public synchronized void write(byte[] b, int off, int len) |
| { |
| if (pos > count) |
| { |
| byte[] zeros = new byte[pos - count]; |
| super.write(zeros, 0, zeros.length); |
| pos = count; |
| } |
| else if (pos < count) |
| { |
| int overlap = Math.min(count - pos, len); |
| System.arraycopy(b, off, buf, pos, overlap); |
| pos += overlap; |
| off += overlap; |
| len -= overlap; |
| } |
| super.write(b, off, len); |
| pos += len; |
| } |
| |
| final public synchronized void readFully(byte[] bytes) |
| { |
| int len = bytes.length; |
| if (pos+len > count) |
| { |
| throw new IndexOutOfBoundsException(); |
| } |
| System.arraycopy(buf, pos, bytes, 0, len); |
| pos += len; |
| } |
| |
| final public synchronized void write(int b) |
| { |
| if (count > pos) |
| { |
| buf[pos++] = (byte) b; |
| } |
| else |
| { |
| super.write(b); |
| pos++; |
| } |
| } |
| |
| public synchronized void reset() |
| { |
| super.reset(); |
| pos = 0; |
| } |
| |
| public synchronized byte[] toByteArray() |
| { |
| count = pos; |
| return super.toByteArray(); |
| } |
| |
| public synchronized void writeTo(OutputStream out) throws IOException |
| { |
| count = pos; |
| super.writeTo(out); |
| } |
| |
| public byte[] getByteArray() |
| { |
| return buf; |
| } |
| } |