ntfsattribute.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 163 行

/*
 * $Id: NTFSAttribute.java,v 1.5 2004/01/19 21:20:55 vchira_2000 Exp $
 */
package org.jnode.fs.ntfs.attributes;

import 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 abstract class NTFSAttribute
{
	protected byte[] buffer = null;
	 
	// only for named attributes(when name lengthe > 0)
	String name = null;
	
	private NTFSFileRecord fileRecord = null;
	
	/**
	 * 
	 */
	public NTFSAttribute(NTFSFileRecord fileRecord,byte[] buffer) 
	{
		super();
		this.buffer = buffer;
		this.fileRecord = fileRecord;
		
	}
	
	/**
	 * @return Returns the attributeType.
	 */
	public int getAttributeType()
	{
		return NTFSUTIL.LE_READ_U32_INT( buffer, 0x00);
	}
	/*
	 *  	Flag   |Description
	 *    -------------------
	 *		0x0001 |Compressed
	 *		0x4000 |Encrypted
	 *		0x8000 |Sparse
	 */
	public int getFlags()
	{
		return NTFSUTIL.LE_READ_U16_INT(buffer[0x0C],buffer[0x0D]);
	}
	/**
	 * @return Returns the nameLength.
	 */
	public byte getNameLength()
	{
		return buffer[0x09];
	}
	/**
	 * @return Returns the nameOffset.
	 */
	public int getNameOffset()
	{
		return NTFSUTIL.LE_READ_U16_INT(buffer[0x0A],buffer[0x0B]);
	}
	/**
	 * @return Returns the attributeID.
	 */
	public int getAttributeID() {
		return NTFSUTIL.LE_READ_U16_INT(buffer[0x0E],buffer[0x0F]);
	}

	/**
	 * @return Returns the attributeName.
	 */
	public String getAttributeName() {
		// if it is named fill the attribute name 
		if(getNameLength() > 0)
		{	
			char[] namebuf = new char[getNameLength()];
			for(int i = 0;i < getNameLength();i++)
			{
				namebuf[i] = NTFSUTIL.READ16_CHAR(
						buffer[getNameOffset() + (i*2)],
						buffer[getNameOffset() + (i*2) + 1]);
			}
			return new String(namebuf);
		}
		return null;
	}

	/**
	 * @return Returns the volume.
	 */

	/**
	 * @return Returns the fileRecord.
	 */
	public NTFSFileRecord getFileRecord() {
		return this.fileRecord;
	}

	/**
	 * @param fileRecord The fileRecord to set.
	 */
	public void setFileRecord(NTFSFileRecord fileRecord) {
		this.fileRecord = fileRecord;
	}

	/**
	 * @return Returns the resident.
	 */
	public boolean isResident() {
		return buffer[ + 0x08]==0;
	}

	/**
	 * @return Returns the name.
	 */
	public String getName() {
		return this.name;
	}

	/**
	 * @param name The name to set.
	 */
	public void setName(String name) {
		this.name = name;
	}


	public int getLength()
	{
		return NTFSUTIL.LE_READ_U32_INT( buffer,4);
	}
	
	public static NTFSAttribute getAttribute(NTFSFileRecord fileRecord, byte[] buffer)
	{
		// check the resident flag
		if(buffer[0x08] ==0 )
			// resident
			return new NTFSResidentAttribute(fileRecord,buffer);
		else
			// non resident
			return new NTFSNonResidentAttribute(fileRecord,buffer);
		
	}
	/**
	 * @return Returns the buffer.
	 */
	public byte[] getBuffer()
	{
		return buffer;
	}
	/**
	 * @param buffer The buffer to set.
	 */
	public void setBuffer(byte[] buffer)
	{
		this.buffer = buffer;
	}
}