2 * Copyright 2008 ZXing authors
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 package com.google.zxing.common;
20 * This class implements an array of unsigned bytes.
22 * @author dswitkin@google.com (Daniel Switkin)
24 public final class ByteArray {
26 private static final int INITIAL_SIZE = 32;
36 public ByteArray(int size) {
37 bytes = new byte[size];
41 public ByteArray(String string) {
42 bytes = string.getBytes();
46 public ByteArray(byte[] byteArray) {
52 * Access an unsigned byte at location index.
53 * @param index The index in the array to access.
54 * @return The unsigned value of the byte as an int.
56 public int at(int index) {
57 return bytes[index] & 0xff;
60 public void set(int index, int value) {
61 bytes[index] = (byte) value;
68 public boolean empty() {
72 public void appendByte(int value) {
73 if (size == 0 || size >= bytes.length) {
74 int newSize = Math.max(INITIAL_SIZE, size * 2);
77 bytes[size] = (byte) value;
81 public void reserve(int capacity) {
82 if (bytes == null || bytes.length < capacity) {
83 byte[] newArray = new byte[capacity];
85 System.arraycopy(bytes, 0, newArray, 0, bytes.length);
91 // Copy count bytes from array source starting at offset.
92 public void set(byte[] source, int offset, int count) {
93 bytes = new byte[count];
95 for (int x = 0; x < count; x++) {
96 bytes[x] = source[offset + x];