/*
* Copyright 2008 ZXing authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.itextpdf.text.pdf.qrcode;
/**
* This class implements an array of unsigned bytes.
*
* @author dswitkin@google.com (Daniel Switkin)
* @since 5.0.2
*/
public final class ByteArray {
private static final int INITIAL_SIZE = 32;
private byte[] bytes;
private int size;
public ByteArray() {
bytes = null;
size = 0;
}
public ByteArray(int size) {
bytes = new byte[size];
this.size = size;
}
public ByteArray(byte[] byteArray) {
bytes = byteArray;
size = bytes.length;
}
/**
* Access an unsigned byte at location index.
* @param index The index in the array to access.
* @return The unsigned value of the byte as an int.
*/
public int at(int index) {
return bytes[index] & 0xff;
}
public void set(int index, int value) {
bytes[index] = (byte) value;
}
public int size() {
return size;
}
public boolean isEmpty() {
return size == 0;
}
public void appendByte(int value) {
if (size == 0 || size >= bytes.length) {
int newSize = Math.max(INITIAL_SIZE, size << 1);
reserve(newSize);
}
bytes[size] = (byte) value;
size++;
}
public void reserve(int capacity) {
if (bytes == null || bytes.length < capacity) {
byte[] newArray = new byte[capacity];
if (bytes != null) {
System.arraycopy(bytes, 0, newArray, 0, bytes.length);
}
bytes = newArray;
}
}
// Copy count bytes from array source starting at offset.
public void set(byte[] source, int offset, int count) {
bytes = new byte[count];
size = count;
for (int x = 0; x < count; x++) {
bytes[x] = source[offset + x];
}
}
}