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/*
* Copyright (c) 2007 innoSysTec (R) GmbH, Germany. All rights reserved.
* Original author: Edmund Wagner
* Creation date: 30.05.2007
*
* Source: $HeadURL$
* Last changed: $LastChangedDate$
*
* the unrar licence applies to all junrar source and binary distributions
* you are not allowed to use this source to re-create the RAR compression algorithm
*
* Here some html entities which can be used for escaping javadoc tags:
* "&": "&" or "&"
* "<": "<" or "<"
* ">": ">" or ">"
* "@": "@"
*/
package com.github.junrar.io;
import java.io.EOFException;
import java.io.IOException;
/**
* A File like access to a byte array.
* (seek and read certain number of bytes)
*
* @author $LastChangedBy$
* @version $LastChangedRevision$
*/
public class ReadOnlyAccessByteArray implements IReadOnlyAccess{
private int positionInFile;
private byte[] file;
/**
* Initialize with byte[ ]
* @param file the file given as byte array
*/
public ReadOnlyAccessByteArray(byte[] file){
if(file == null){
throw new NullPointerException("file must not be null!!");
}
this.file = file;
this.positionInFile = 0;
}
public long getPosition() throws IOException {
return positionInFile;
}
public void setPosition(long pos) throws IOException {
if (pos < file.length && pos >= 0){
this.positionInFile = (int)pos;
}
else{
throw new EOFException();
}
}
/** Read a single byte of data. */
public int read() throws IOException {
return file[positionInFile++];
}
/**
* Read up to <tt>count</tt> bytes to the specified buffer.
*/
public int read(byte[] buffer, int off, int count) throws IOException {
int read = Math.min(count, file.length-positionInFile);
System.arraycopy(file, positionInFile, buffer, off, read);
positionInFile += read;
return read;
}
public int readFully(byte[] buffer, int count) throws IOException {
if(buffer == null ){
throw new NullPointerException("buffer must not be null");
}
if(count == 0){
throw new IllegalArgumentException("cannot read 0 bytes ;-)");
}
int read = Math.min(count, file.length-(int)positionInFile-1);
System.arraycopy(file, (int)positionInFile, buffer, 0, read );
positionInFile+=read;
return read;
}
public void close() throws IOException {
}
}
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