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(byte[] byteArray) {
47 * Access an unsigned byte at location index.
48 * @param index The index in the array to access.
49 * @return The unsigned value of the byte as an int.
51 public int at(int index) {
52 return bytes[index] & 0xff;
55 public void set(int index, int value) {
56 bytes[index] = (byte) value;
63 public boolean isEmpty() {
67 public void appendByte(int value) {
68 if (size == 0 || size >= bytes.length) {
69 int newSize = Math.max(INITIAL_SIZE, size << 1);
72 bytes[size] = (byte) value;
76 public void reserve(int capacity) {
77 if (bytes == null || bytes.length < capacity) {
78 byte[] newArray = new byte[capacity];
80 System.arraycopy(bytes, 0, newArray, 0, bytes.length);
86 // Copy count bytes from array source starting at offset.
87 public void set(byte[] source, int offset, int count) {
88 bytes = new byte[count];
90 for (int x = 0; x < count; x++) {
91 bytes[x] = source[offset + x];