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The Apache PDFBox library is an open source Java tool for working with PDF documents.
This artefact contains the PDFDebugger.
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.pdfbox.debugger.hexviewer;
import java.util.ArrayList;
import java.util.List;
/**
* @author Khyrul Bashar
*
* A class that acts as a model for the hex viewer. It holds the data and provide the data as necessary.
* It'll let listen for any underlying data changes.
*/
class HexModel implements HexChangeListener
{
private final List data;
private final List modelChangeListeners;
/**
* Constructor
* @param bytes Byte array.
*/
HexModel(byte[] bytes)
{
data = new ArrayList<>(bytes.length);
for (byte b: bytes)
{
data.add(b);
}
modelChangeListeners = new ArrayList<>();
}
/**
* provides the byte for a specific index of the byte array.
* @param index int.
* @return byte instance
*/
public byte getByte(int index)
{
return data.get(index);
}
/**
* Provides a character array of 16 characters on availability.
* @param lineNumber int. The line number of the characters. Line counting starts from 1.
* @return A char array.
*/
public char[] getLineChars(int lineNumber)
{
int start = (lineNumber-1) * 16;
int length = Math.min(data.size() - start, 16);
char[] chars = new char[length];
for (int i = 0; i < chars.length; i++)
{
char c = Character.toChars(data.get(start) & 0XFF)[0];
if (!isAsciiPrintable(c))
{
c = '.';
}
chars[i] = c;
start++;
}
return chars;
}
public byte[] getBytesForLine(int lineNumber)
{
int index = (lineNumber-1) * 16;
int length = Math.min(data.size() - index, 16);
byte[] bytes = new byte[length];
for (int i = 0; i < bytes.length; i++)
{
bytes[i] = data.get(index);
index++;
}
return bytes;
}
/**
* Provides the size of the model i.e. size of the input.
* @return int value.
*/
public int size()
{
return data.size();
}
/**
*
* @return
*/
public int totalLine()
{
return size() % 16 != 0 ? size()/16 + 1 : size()/16;
}
public static int lineNumber(int index)
{
int elementNo = index + 1;
return elementNo % 16 != 0 ? elementNo/16 + 1 : elementNo/16;
}
public static int elementIndexInLine(int index)
{
return index%16;
}
private static boolean isAsciiPrintable(char ch)
{
return ch >= 32 && ch < 127;
}
public void addHexModelChangeListener(HexModelChangeListener listener)
{
modelChangeListeners.add(listener);
}
public void updateModel(int index, byte value)
{
if (!data.get(index).equals(value))
{
data.set(index, value);
fireModelChanged(index);
}
}
@Override
public void hexChanged(HexChangedEvent event)
{
int index = event.getByteIndex();
if (index != -1 && getByte(index) != event.getNewValue())
{
data.set(index, event.getNewValue());
}
fireModelChanged(index);
}
private void fireModelChanged(int index)
{
modelChangeListeners.forEach(listener ->
listener.hexModelChanged(new HexModelChangedEvent(index, HexModelChangedEvent.SINGLE_CHANGE)));
}
}