/*
* This file is part of the Wayback archival access software
* (http://archive-access.sourceforge.net/projects/wayback/).
*
* Licensed to the Internet Archive (IA) by one or more individual
* contributors.
*
* The IA 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.archive.wayback.resourceindex.ziplines;
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
/**
* Simple block loader which uses RandomAccessFiles to grab ranges of local
* files.
* @author brad
*
*/
public class LocalFileBlockLoader implements BlockLoader {
public byte[] getBlock(String url, long offset, int length)
throws IOException {
File file = new File(url);
RandomAccessFile raf = new RandomAccessFile(file, "r");
raf.seek(offset);
if(raf.getFilePointer() != offset) {
throw new IOException("Failed seek("+offset+") in ("+url+")");
}
byte b[] = new byte[length];
raf.readFully(b);
raf.close();
return b;
}
}