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