nes-proj/tools/coffee-manager/org/contikios/coffee/CoffeeFile.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 org.contikios.coffee;
import java.io.*;
public class CoffeeFile {
protected CoffeeFS coffeeFS;
protected CoffeeHeader header;
private String name;
private int length;
private int reservedSize;
private CoffeeMicroLog microLog;
private boolean knownLength;
public CoffeeFile(CoffeeFS coffeeFS, CoffeeHeader header) throws IOException {
this.coffeeFS = coffeeFS;
this.header = header;
name = header.name;
reservedSize = header.maxPages * coffeeFS.getConfiguration().pageSize;
if (header.isModified() &&
coffeeFS.getConfiguration().useMicroLogs == true) {
microLog = new CoffeeMicroLog(coffeeFS, coffeeFS.readHeader(header.logPage));
} else {
microLog = null;
}
}
private int calculateLength() throws IOException {
byte[] bytes = new byte[1];
int i;
for (i = reservedSize; i >= header.rawLength(); i--) {
coffeeFS.getImage().read(bytes, 1, header.getPage() * coffeeFS.getConfiguration().pageSize + i);
if (bytes[0] != 0) {
return i - header.rawLength() + 1;
}
}
return 0;
}
public void insertContents(FileInputStream input) throws IOException {
byte[] bytes = new byte[1];
int ch;
int startOffset = header.getPage() *
coffeeFS.getConfiguration().pageSize +
header.rawLength();
length = 0;
knownLength = true;
while((ch = input.read()) != -1) {
bytes[0] = (byte) ch;
coffeeFS.getImage().write(bytes, 1,
startOffset + length);
length++;
}
}
public void saveContents(File file) throws IOException {
int startOffset = header.getPage() *
coffeeFS.getConfiguration().pageSize +
header.rawLength();
int i;
byte[] bytes;
FileOutputStream fOut = new FileOutputStream(file);
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if (microLog != null) {
for (i = 0; i < microLog.getLogRecords(); i++) {
bytes = microLog.getRegion(i);
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if (bytes == null) {
bytes = new byte[microLog.getLogRecordSize()];
coffeeFS.getImage().read(bytes, bytes.length, i * microLog.getLogRecordSize());
}
fOut.write(bytes);
}
} else {
bytes = new byte[1];
for (i = 0; i < getLength(); i++) {
coffeeFS.getImage().read(bytes, 1, startOffset + i);
fOut.write(bytes);
}
}
fOut.close();
}
public void remove() {
header.makeObsolete();
}
public CoffeeHeader getHeader() {
return header;
}
public int getLength() throws IOException {
if (!knownLength) {
length = calculateLength();
knownLength = true;
}
return length;
}
public String getName() {
return name;
}
public int getReservedSize() {
return reservedSize;
}
}