1/*
2 * Copyright (c) 2001, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package jdk.internal.reflect;
27
28class ByteVectorImpl implements ByteVector {
29    private byte[] data;
30    private int pos;
31
32    public ByteVectorImpl() {
33        this(100);
34    }
35
36    public ByteVectorImpl(int sz) {
37        data = new byte[sz];
38        pos = -1;
39    }
40
41    public int getLength() {
42        return pos + 1;
43    }
44
45    public byte get(int index) {
46        if (index >= data.length) {
47            resize(index);
48            pos = index;
49        }
50        return data[index];
51    }
52
53    public void put(int index, byte value) {
54        if (index >= data.length) {
55            resize(index);
56            pos = index;
57        }
58        data[index] = value;
59    }
60
61    public void add(byte value) {
62        if (++pos >= data.length) {
63            resize(pos);
64        }
65        data[pos] = value;
66    }
67
68    public void trim() {
69        if (pos != data.length - 1) {
70            byte[] newData = new byte[pos + 1];
71            System.arraycopy(data, 0, newData, 0, pos + 1);
72            data = newData;
73        }
74    }
75
76    public byte[] getData() {
77        return data;
78    }
79
80    private void resize(int minSize) {
81        if (minSize <= 2 * data.length) {
82            minSize = 2 * data.length;
83        }
84        byte[] newData = new byte[minSize];
85        System.arraycopy(data, 0, newData, 0, data.length);
86        data = newData;
87    }
88}
89