1/*
2 * reserved comment block
3 * DO NOT REMOVE OR ALTER!
4 */
5/**
6 * Licensed to the Apache Software Foundation (ASF) under one
7 * or more contributor license agreements. See the NOTICE file
8 * distributed with this work for additional information
9 * regarding copyright ownership. The ASF licenses this file
10 * to you under the Apache License, Version 2.0 (the
11 * "License"); you may not use this file except in compliance
12 * with the License. You may obtain a copy of the License at
13 *
14 * http://www.apache.org/licenses/LICENSE-2.0
15 *
16 * Unless required by applicable law or agreed to in writing,
17 * software distributed under the License is distributed on an
18 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
19 * KIND, either express or implied. See the License for the
20 * specific language governing permissions and limitations
21 * under the License.
22 */
23package com.sun.org.apache.xml.internal.security.utils;
24
25import java.io.OutputStream;
26
27/**
28 * A simple Unsynced ByteArrayOutputStream
29 * @author raul
30 *
31 */
32public class UnsyncByteArrayOutputStream extends OutputStream  {
33
34    private static final int INITIAL_SIZE = 8192;
35
36    private byte[] buf;
37    private int size = INITIAL_SIZE;
38    private int pos = 0;
39
40    public UnsyncByteArrayOutputStream() {
41        buf = new byte[INITIAL_SIZE];
42    }
43
44    public void write(byte[] arg0) {
45        if ((Integer.MAX_VALUE - pos) < arg0.length) {
46            throw new OutOfMemoryError();
47        }
48        int newPos = pos + arg0.length;
49        if (newPos > size) {
50            expandSize(newPos);
51        }
52        System.arraycopy(arg0, 0, buf, pos, arg0.length);
53        pos = newPos;
54    }
55
56    public void write(byte[] arg0, int arg1, int arg2) {
57        if ((Integer.MAX_VALUE - pos) < arg2) {
58            throw new OutOfMemoryError();
59        }
60        int newPos = pos + arg2;
61        if (newPos > size) {
62            expandSize(newPos);
63        }
64        System.arraycopy(arg0, arg1, buf, pos, arg2);
65        pos = newPos;
66    }
67
68    public void write(int arg0) {
69        if ((Integer.MAX_VALUE - pos) == 0) {
70            throw new OutOfMemoryError();
71        }
72        int newPos = pos + 1;
73        if (newPos > size) {
74            expandSize(newPos);
75        }
76        buf[pos++] = (byte)arg0;
77    }
78
79    public byte[] toByteArray() {
80        byte result[] = new byte[pos];
81        System.arraycopy(buf, 0, result, 0, pos);
82        return result;
83    }
84
85    public void reset() {
86        pos = 0;
87    }
88
89    private void expandSize(int newPos) {
90        int newSize = size;
91        while (newPos > newSize) {
92            newSize = newSize << 1;
93            // Deal with overflow
94            if (newSize < 0) {
95                newSize = Integer.MAX_VALUE;
96            }
97        }
98        byte newBuf[] = new byte[newSize];
99        System.arraycopy(buf, 0, newBuf, 0, pos);
100        buf = newBuf;
101        size = newSize;
102    }
103}
104