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204 lines
5.2 KiB
Java
204 lines
5.2 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 se.sics.coffee;
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class CoffeeHeader {
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private final CoffeeConfiguration conf;
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private final int page;
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private static final int HDR_FLAG_VALID = 0x1;
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private static final int HDR_FLAG_ALLOCATED = 0x2;
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private static final int HDR_FLAG_OBSOLETE = 0x4;
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private static final int HDR_FLAG_MODIFIED = 0x8;
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private static final int HDR_FLAG_LOG = 0x10;
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private static final int HDR_FLAG_ISOLATED = 0x20;
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int logPage;
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int logRecords;
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int logRecordSize;
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int maxPages;
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String name;
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private int flags;
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public CoffeeHeader(CoffeeFS coffeeFS, int page) {
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this.page = page;
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conf = coffeeFS.getConfiguration();
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}
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public CoffeeHeader(CoffeeFS coffeeFS, int page, byte[] bytes) {
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this(coffeeFS, page);
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processRawHeader(bytes);
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}
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private int getInt(byte[] bytes, int index) {
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return (bytes[index] & 0xff) + ((bytes[index + 1] & 0xff) << 8);
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}
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private void processRawHeader(byte[] bytes) {
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int index = 0;
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logPage = getPageValue(bytes, 0);
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index += conf.pageTypeSize;
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logRecords = getInt(bytes, index);
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index += 2;
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logRecordSize = getInt(bytes, index);
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index += 2;
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maxPages = getPageValue(bytes, index);
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index += conf.pageTypeSize;
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index++; // Skip deprecated EOF hint field.
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flags = bytes[index] & 0xff;
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index++;
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name = new String(bytes).substring(index,
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index + conf.nameLength);
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int nullCharOffset = name.indexOf(0);
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if (nullCharOffset >= 0) {
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name = name.substring(0, nullCharOffset);
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}
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}
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private byte[] setPageValue(int page) {
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byte[] bytes = new byte[conf.pageTypeSize];
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for (int i = conf.pageTypeSize - 1; i >= 0; i--) {
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bytes[i] = (byte) (page >> (8 * i));
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}
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return bytes;
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}
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private int getPageValue(byte[] bytes, int offset) {
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int page = 0;
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for (int i = 0; i < conf.pageTypeSize; i++) {
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page |= (bytes[offset + i] & 0xff) << (8 * i);
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}
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return page;
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}
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public byte[] toRawHeader() {
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byte[] bytes = new byte[2 * conf.pageTypeSize +
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conf.nameLength + 6];
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int index = 0;
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System.arraycopy(setPageValue(logPage), 0, bytes, 0,
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conf.pageTypeSize);
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index += conf.pageTypeSize;
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bytes[index++] = (byte) (logRecords >> 8);
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bytes[index++] = (byte) logRecords;
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bytes[index++] = (byte) (logRecordSize >> 8);
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bytes[index++] = (byte) logRecordSize;
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System.arraycopy(setPageValue(maxPages), 0, bytes, index,
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conf.pageTypeSize);
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index += conf.pageTypeSize;
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bytes[index++] = 0; // Deprecated EOF hint field.
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bytes[index++] = (byte) flags;
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byte[] nameBytes = name.getBytes();
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int copyLength = nameBytes.length > conf.nameLength ?
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conf.nameLength : nameBytes.length;
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System.arraycopy(nameBytes, 0, bytes, index, copyLength);
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return bytes;
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}
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public int rawLength() {
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return 2 * conf.pageTypeSize + conf.nameLength + 6;
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}
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public int getPage() {
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return page;
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}
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public boolean isValid() {
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return (flags & HDR_FLAG_VALID) != 0;
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}
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public boolean isAllocated() {
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return (flags & HDR_FLAG_ALLOCATED) != 0;
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}
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public boolean isObsolete() {
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return (flags & HDR_FLAG_OBSOLETE) != 0;
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}
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public boolean isModified() {
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return (flags & HDR_FLAG_MODIFIED) != 0;
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}
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public boolean isIsolated() {
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return (flags & HDR_FLAG_ISOLATED) != 0;
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}
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public boolean isLog() {
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return (flags & HDR_FLAG_LOG) != 0;
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}
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public boolean isFree() {
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return !isAllocated();
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}
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public boolean isActive() {
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return isAllocated() && !isObsolete() && !isIsolated();
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}
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public void allocate() {
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flags |= HDR_FLAG_ALLOCATED;
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}
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public void makeObsolete() {
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flags |= HDR_FLAG_OBSOLETE;
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}
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public void setName(String name) {
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this.name = name;
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}
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public void setReservedSize(int pages) {
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maxPages = pages;
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}
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public int getReservedSize() {
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return maxPages;
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}
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}
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