ntfsbootrecord.java

来自「纯java操作系统jnode,安装简单和操作简单的个人使用的Java操作系统」· Java 代码 · 共 159 行

/*
 * $Id: NTFSBootRecord.java,v 1.7 2004/01/19 17:45:45 vchira_2000 Exp $
 */
package org.jnode.fs.ntfs;


/**
 * @author Chira
 *
 * To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Generation - Code and Comments
 */
public class NTFSBootRecord
{
	private String SystemID = null;
	private int BytesPerSector;
	private byte SectorPerCluster;
	private int MFTPointer;
	private byte MediaDescriptor;
	private int SectorsPerTrack;
	private int clustersPerMFTRecord = 0;
	private int totalSectors;
	
	// try to cache this value
	private int bytesPerFileRecord = -1;

	/**
	 * @param buffer
	 */
	
	public void initBootRecordData(byte[] buffer)
	{
		this.SystemID = new String(buffer,0x03,8);
		this.BytesPerSector = NTFSUTIL.LE_READ_U16_INT(buffer[0x0B],buffer[0x0C]);
		this.SectorPerCluster = buffer[0x0D];
		// LONG LONG fix it!!
		this.MFTPointer = NTFSUTIL.LE_READ_U32_INT(buffer,0x30);//makeWORDfrom2Bytes(byteMFTPointer[0],byteMFTPointer[1]);
		this.MediaDescriptor = buffer[0x15];
		this.SectorsPerTrack = NTFSUTIL.LE_READ_U16_INT(buffer[0x18],buffer[0x19]);
		
		this.clustersPerMFTRecord = NTFSUTIL.LE_READ_32_INT(buffer,0x40);
		
		this.totalSectors = NTFSUTIL.LE_READ_U32_INT(buffer,0x28);
	}
	
	public int getMFTByteStart()
	{
		return (this.MFTPointer * this.SectorPerCluster)* this.BytesPerSector;
	}
	
	/**
	 * @return Returns the bytesPerSector.
	 */
	public int getBytesPerSector() {
		return this.BytesPerSector;
	}

	/**
	 * @param bytesPerSector The bytesPerSector to set.
	 */
	public void setBytesPerSector(int bytesPerSector) {
		this.BytesPerSector = bytesPerSector;
	}

	/**
	 * @return Returns the mediaDescriptor.
	 */
	public byte getMediaDescriptor() {
		return this.MediaDescriptor;
	}

	/**
	 * @param mediaDescriptor The mediaDescriptor to set.
	 */
	public void setMediaDescriptor(byte mediaDescriptor) {
		this.MediaDescriptor = mediaDescriptor;
	}

	/**
	 * @return Returns the mFTPointer.
	 */
	public int getMFTPointer() {
		return this.MFTPointer;
	}

	/**
	 * @param pointer The mFTPointer to set.
	 */
	public void setMFTPointer(int pointer) {
		this.MFTPointer = pointer;
	}

	/**
	 * @return Returns the sectorPerCluster.
	 */
	public byte getSectorPerCluster() {
		return this.SectorPerCluster;
	}

	/**
	 * @param sectorPerCluster The sectorPerCluster to set.
	 */
	public void setSectorPerCluster(byte sectorPerCluster) {
		this.SectorPerCluster = sectorPerCluster;
	}

	/**
	 * @return Returns the sectorsPerTrack.
	 */
	public int getSectorsPerTrack() {
		return this.SectorsPerTrack;
	}

	/**
	 * @param sectorsPerTrack The sectorsPerTrack to set.
	 */
	public void setSectorsPerTrack(int sectorsPerTrack) {
		this.SectorsPerTrack = sectorsPerTrack;
	}

	/**
	 * @return Returns the systemID.
	 */
	public String getSystemID() {
		return this.SystemID;
	}

	/**
	 * @param systemID The systemID to set.
	 */
	public void setSystemID(String systemID) {
		this.SystemID = systemID;
	}

	/**
	 * @return Returns the totalSectors.
	 */
	public int getTotalSectors() {
		return this.totalSectors;
	}

	/**
	 * @param totalSectors The totalSectors to set.
	 */
	public void setTotalSectors(int totalSectors) {
		this.totalSectors = totalSectors;
	}

	public int getBytesPerFileRecord()
	{
		if(bytesPerFileRecord < 0 )
			if( this.clustersPerMFTRecord > 0 )
				bytesPerFileRecord = this.clustersPerMFTRecord * (this.SectorPerCluster * this.BytesPerSector);
			else
				bytesPerFileRecord = (1 << -this.clustersPerMFTRecord);
		return bytesPerFileRecord;
	}
}