144 lines
4.1 KiB
Java
144 lines
4.1 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.*;
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public class CoffeeFile {
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protected CoffeeFS coffeeFS;
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protected CoffeeHeader header;
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private String name;
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private int length;
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private int reservedSize;
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private CoffeeMicroLog microLog;
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private boolean knownLength;
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public CoffeeFile(CoffeeFS coffeeFS, CoffeeHeader header) throws IOException {
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this.coffeeFS = coffeeFS;
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this.header = header;
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name = header.name;
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reservedSize = header.maxPages * coffeeFS.getConfiguration().pageSize;
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if (header.isModified() &&
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coffeeFS.getConfiguration().useMicroLogs == true) {
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microLog = new CoffeeMicroLog(coffeeFS, coffeeFS.readHeader(header.logPage));
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} else {
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microLog = null;
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}
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}
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private int calculateLength() throws IOException {
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byte[] bytes = new byte[1];
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int i;
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for (i = reservedSize; i >= header.rawLength(); i--) {
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coffeeFS.getImage().read(bytes, 1, header.getPage() * coffeeFS.getConfiguration().pageSize + i);
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if (bytes[0] != 0) {
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return i - header.rawLength() + 1;
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}
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}
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return 0;
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}
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public void insertContents(FileInputStream input) throws IOException {
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byte[] bytes = new byte[1];
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int ch;
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int startOffset = header.getPage() *
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coffeeFS.getConfiguration().pageSize +
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header.rawLength();
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length = 0;
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knownLength = true;
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while((ch = input.read()) != -1) {
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bytes[0] = (byte) ch;
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coffeeFS.getImage().write(bytes, 1,
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startOffset + length);
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length++;
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}
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}
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public void saveContents(File file) throws IOException {
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int startOffset = header.getPage() *
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coffeeFS.getConfiguration().pageSize +
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header.rawLength();
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int i;
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byte[] bytes;
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FileOutputStream fOut = new FileOutputStream(file);
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if (microLog != null) {
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for (i = 0; i < microLog.getLogRecords(); i++) {
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bytes = microLog.getRegion(i);
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if (bytes == null) {
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bytes = new byte[microLog.getLogRecordSize()];
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coffeeFS.getImage().read(bytes, bytes.length, i * microLog.getLogRecordSize());
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}
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fOut.write(bytes);
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}
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} else {
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bytes = new byte[1];
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for (i = 0; i < getLength(); i++) {
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coffeeFS.getImage().read(bytes, 1, startOffset + i);
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fOut.write(bytes);
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}
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}
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fOut.close();
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}
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public void remove() {
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header.makeObsolete();
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}
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public CoffeeHeader getHeader() {
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return header;
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}
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public int getLength() throws IOException {
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if (!knownLength) {
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length = calculateLength();
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knownLength = true;
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}
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return length;
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}
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public String getName() {
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return name;
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}
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public int getReservedSize() {
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return reservedSize;
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}
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}
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