| /** |
| * 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 org.apache.xml.security.utils; |
| |
| import java.io.IOException; |
| import java.io.OutputStream; |
| |
| /** |
| * A simple Unsynced ByteArrayOutputStream |
| * |
| */ |
| public class UnsyncByteArrayOutputStream extends OutputStream { |
| |
| // Maximum array size. Using same value as ArrayList in OpenJDK. |
| // Integer.MAX_VALUE doesn't work on some VMs, as some header values are reserved |
| private static final int VM_ARRAY_INDEX_MAX_VALUE = Integer.MAX_VALUE - 8; |
| private static final int INITIAL_SIZE = 8192; |
| |
| private byte[] buf; |
| private int size = INITIAL_SIZE; |
| private int pos; |
| |
| public UnsyncByteArrayOutputStream() { |
| buf = new byte[INITIAL_SIZE]; |
| } |
| |
| public void write(byte[] arg0) { |
| if ((VM_ARRAY_INDEX_MAX_VALUE - pos) < arg0.length) { |
| throw new OutOfMemoryError(); |
| } |
| int newPos = pos + arg0.length; |
| if (newPos > size) { |
| expandSize(newPos); |
| } |
| System.arraycopy(arg0, 0, buf, pos, arg0.length); |
| pos = newPos; |
| } |
| |
| public void write(byte[] arg0, int arg1, int arg2) { |
| if ((VM_ARRAY_INDEX_MAX_VALUE - pos) < arg2) { |
| throw new OutOfMemoryError(); |
| } |
| int newPos = pos + arg2; |
| if (newPos > size) { |
| expandSize(newPos); |
| } |
| System.arraycopy(arg0, arg1, buf, pos, arg2); |
| pos = newPos; |
| } |
| |
| public void write(int arg0) { |
| if (VM_ARRAY_INDEX_MAX_VALUE - pos == 0) { |
| throw new OutOfMemoryError(); |
| } |
| int newPos = pos + 1; |
| if (newPos > size) { |
| expandSize(newPos); |
| } |
| buf[pos++] = (byte)arg0; |
| } |
| |
| public byte[] toByteArray() { |
| byte result[] = new byte[pos]; |
| System.arraycopy(buf, 0, result, 0, pos); |
| return result; |
| } |
| |
| public void reset() { |
| pos = 0; |
| } |
| |
| /** |
| * Takes the contents of this stream and writes it to the output stream |
| * {@code out}. |
| * |
| * @param out |
| * an OutputStream on which to write the contents of this stream. |
| * @throws IOException |
| * if an error occurs while writing to {@code out}. |
| */ |
| public void writeTo(OutputStream out) throws IOException { |
| out.write(buf, 0, pos); |
| } |
| |
| private void expandSize(int newPos) { |
| int newSize = size; |
| while (newPos > newSize) { |
| newSize = newSize << 1; |
| // Deal with overflow |
| if (newSize < 0) { |
| newSize = VM_ARRAY_INDEX_MAX_VALUE; |
| } |
| } |
| byte newBuf[] = new byte[newSize]; |
| System.arraycopy(buf, 0, newBuf, 0, pos); |
| buf = newBuf; |
| size = newSize; |
| } |
| } |