001/* 002 * Copyright 2008 ZXing authors 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package com.itextpdf.text.pdf.qrcode; 018 019/** 020 * This class implements an array of unsigned bytes. 021 * 022 * @author dswitkin@google.com (Daniel Switkin) 023 * @since 5.0.2 024 */ 025public final class ByteArray { 026 027 private static final int INITIAL_SIZE = 32; 028 029 private byte[] bytes; 030 private int size; 031 032 public ByteArray() { 033 bytes = null; 034 size = 0; 035 } 036 037 public ByteArray(int size) { 038 bytes = new byte[size]; 039 this.size = size; 040 } 041 042 public ByteArray(byte[] byteArray) { 043 bytes = byteArray; 044 size = bytes.length; 045 } 046 047 /** 048 * Access an unsigned byte at location index. 049 * @param index The index in the array to access. 050 * @return The unsigned value of the byte as an int. 051 */ 052 public int at(int index) { 053 return bytes[index] & 0xff; 054 } 055 056 public void set(int index, int value) { 057 bytes[index] = (byte) value; 058 } 059 060 public int size() { 061 return size; 062 } 063 064 public boolean isEmpty() { 065 return size == 0; 066 } 067 068 public void appendByte(int value) { 069 if (size == 0 || size >= bytes.length) { 070 int newSize = Math.max(INITIAL_SIZE, size << 1); 071 reserve(newSize); 072 } 073 bytes[size] = (byte) value; 074 size++; 075 } 076 077 public void reserve(int capacity) { 078 if (bytes == null || bytes.length < capacity) { 079 byte[] newArray = new byte[capacity]; 080 if (bytes != null) { 081 System.arraycopy(bytes, 0, newArray, 0, bytes.length); 082 } 083 bytes = newArray; 084 } 085 } 086 087 // Copy count bytes from array source starting at offset. 088 public void set(byte[] source, int offset, int count) { 089 bytes = new byte[count]; 090 size = count; 091 for (int x = 0; x < count; x++) { 092 bytes[x] = source[offset + x]; 093 } 094 } 095 096}