osd-contiki/tools/coffee-manager/se/sics/coffee/CoffeeImageFile.java

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/*
* Copyright (c) 2009, Swedish Institute of Computer Science
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @author Nicolas Tsiftes
*
*/
package se.sics.coffee;
import java.io.IOException;
import java.io.RandomAccessFile;
public class CoffeeImageFile implements CoffeeImage {
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private final RandomAccessFile imageFile;
private final CoffeeConfiguration conf;
public CoffeeImageFile(String filename, CoffeeConfiguration conf) throws IOException {
this.conf = conf;
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imageFile = new RandomAccessFile(filename, "rw");
if (imageFile.length() == 0) {
// Allocate a full file system image.
imageFile.setLength(conf.startOffset + conf.fsSize);
}
}
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@Override
public CoffeeConfiguration getConfiguration() {
return conf;
}
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@Override
public void read(byte[] bytes, int size, int offset) throws IOException {
imageFile.seek(conf.startOffset + offset);
imageFile.read(bytes, 0, size);
}
@Override
public void write(byte[] bytes, int size, int offset) throws IOException {
imageFile.seek(conf.startOffset + offset);
imageFile.write(bytes, 0, size);
}
@Override
public void erase(int size, int offset) throws IOException {
byte[] bytes = new byte[256];
int chunkSize;
while(size > 0) {
chunkSize = size > bytes.length ? bytes.length : size;
imageFile.seek(conf.startOffset + offset);
imageFile.write(bytes, 0, chunkSize);
size -= chunkSize;
offset += chunkSize;
}
}
}