/*
* $Id$
*
* Copyright (C) 2003-2013 JNode.org
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; If not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package org.jnode.partitions.ibm;
import org.apache.log4j.Logger;
import org.jnode.driver.block.CHS;
import org.jnode.partitions.PartitionTableEntry;
import org.jnode.util.LittleEndian;
import org.jnode.util.NumberUtils;
/**
* @author epr
*/
public class IBMPartitionTableEntry implements PartitionTableEntry {
private static final int BOOTABLE = 0x80;
private final Logger log = Logger.getLogger(getClass());
private final byte[] bs;
private final int ofs;
private long odd;
@SuppressWarnings("unused")
private final IBMPartitionTable parent;
public IBMPartitionTableEntry(IBMPartitionTable parent, byte[] bs, int partNr) {
this.parent = parent;
this.bs = bs;
this.ofs = 446 + (partNr * 16);
}
public boolean isValid() {
int bootIndicatorValue = getBootIndicatorValue();
return
!isEmpty() &&
(bootIndicatorValue == 0 || bootIndicatorValue == BOOTABLE) &&
getNrSectors() > 0;
}
/**
* @see org.jnode.partitions.PartitionTableEntry#getChildPartitionTable()
*/
public IBMPartitionTable getChildPartitionTable() {
throw new Error("Not implemented yet");
}
/**
* @see org.jnode.partitions.PartitionTableEntry#hasChildPartitionTable()
*/
public boolean hasChildPartitionTable() {
return isExtended();
}
public boolean isEmpty() {
return (getSystemIndicator() == IBMPartitionTypes.PARTTYPE_EMPTY);
}
public boolean isExtended() {
final IBMPartitionTypes id = getSystemIndicator();
// pgwiasda
// there are more than one type of extended Partitions
return
id == IBMPartitionTypes.PARTTYPE_WIN95_FAT32_EXTENDED ||
id == IBMPartitionTypes.PARTTYPE_LINUX_EXTENDED ||
id == IBMPartitionTypes.PARTTYPE_DOS_EXTENDED;
}
public boolean getBootIndicator() {
return getBootIndicatorValue() == BOOTABLE;
}
public int getBootIndicatorValue() {
return LittleEndian.getUInt8(bs, ofs + 0);
}
public void setBootIndicator(boolean active) {
LittleEndian.setInt8(bs, ofs + 0, (active) ? BOOTABLE : 0);
}
public CHS getStartCHS() {
int v1 = LittleEndian.getUInt8(bs, ofs + 1);
int v2 = LittleEndian.getUInt8(bs, ofs + 2);
int v3 = LittleEndian.getUInt8(bs, ofs + 3);
/*
* h = byte1; s = byte2 & 0x3f; c = ((byte2 & 0xc0) << 2) + byte3;
*/
return new CHS(((v2 & 0xc0) << 2) + v3, v1, v2 & 0x3f);
}
public void setStartCHS(CHS chs) {
LittleEndian.setInt8(bs, ofs + 1, Math.min(1023, chs.getHead()));
LittleEndian.setInt8(bs, ofs + 2, ((chs.getCylinder() >> 2) & 0xC0) +
(chs.getSector() & 0x3f));
LittleEndian.setInt8(bs, ofs + 3, chs.getCylinder() & 0xFF);
}
public int getSystemIndicatorCode() {
return LittleEndian.getUInt8(bs, ofs + 4);
}
public IBMPartitionTypes getSystemIndicator() {
int code = getSystemIndicatorCode();
try {
return IBMPartitionTypes.valueOf(code);
} catch (IllegalArgumentException e) {
log.debug("Unknown or invalid system indicator code: 0x" + Integer.toHexString(code));
return IBMPartitionTypes.PARTTYPE_UNKNOWN;
}
}
public void setSystemIndicator(IBMPartitionTypes type) {
LittleEndian.setInt8(bs, ofs + 4, type.getCode());
}
public CHS getEndCHS() {
int v1 = LittleEndian.getUInt8(bs, ofs + 5);
int v2 = LittleEndian.getUInt8(bs, ofs + 6);
int v3 = LittleEndian.getUInt8(bs, ofs + 7);
/*
* h = byte1; s = byte2 & 0x3f; c = ((byte2 & 0xc0) << 2) + byte3;
*/
return new CHS(((v2 & 0xc0) << 2) + v3, v1, v2 & 0x3f);
}
public void setEndCHS(CHS chs) {
LittleEndian.setInt8(bs, ofs + 5, chs.getHead());
LittleEndian.setInt8(bs, ofs + 6, ((chs.getCylinder() >> 2) & 0xC0) +
(chs.getSector() & 0x3f));
LittleEndian.setInt8(bs, ofs + 7, chs.getCylinder() & 0xFF);
}
public long getStartLba() {
return LittleEndian.getUInt32(bs, ofs + 8);
}
public void setStartLba(long v) {
LittleEndian.setInt32(bs, ofs + 8, (int) v);
}
public long getNrSectors() {
return LittleEndian.getUInt32(bs, ofs + 12);
}
public void setNrSectors(long v) {
LittleEndian.setInt32(bs, ofs + 12, (int) v);
}
public long getNbrBlocks(int sectorSize) {
long sectors = getNrSectors();
long blocks = sectors;
if (sectorSize < 1024) {
blocks /= (1024 / sectorSize);
odd = getNrSectors() % (1024 / sectorSize);
} else {
blocks *= (sectorSize / 1024);
}
return blocks;
}
public boolean isOdd() {
return odd != 0;
}
public void clear() {
for (int i = 0; i < 16; i++) {
LittleEndian.setInt8(bs, ofs + i, 0);
}
}
public String dump() {
StringBuilder b = new StringBuilder(64);
for (int i = 0; i < 16; i++) {
b.append(NumberUtils.hex(LittleEndian.getUInt8(bs, ofs + i), 2));
b.append(' ');
}
return b.toString();
}
/**
* @see java.lang.Object#toString()
*/
public String toString() {
StringBuilder b = new StringBuilder(32);
b.append('[').append(getBootIndicator() ? 'A' : '-').append(' ');
b.append(NumberUtils.hex(getSystemIndicatorCode(), 2)).append(" \'");
b.append(getSystemIndicator().getName()).append("\' ");
b.append("s:").append(getStartLba()).append(' ');
b.append("e:").append(getStartLba() + getNrSectors() - 1).append(']');
return b.toString();
}
}