idedrivedescriptor.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 176 行

/*
 * $Id: IDEDriveDescriptor.java,v 1.1 2003/11/25 11:50:41 epr Exp $
 */
package org.jnode.driver.ide;

/**
 * @author epr
 */
public class IDEDriveDescriptor {

	/** Drive identification info */
	private final int[] data;
	/** Is this an atapi drive? */
	private final boolean atapi;
	
	/**
	 * Create a new instance
	 * @param data
	 * @param atapi
	 */
	protected IDEDriveDescriptor(int[] data, boolean atapi) {
		if (data.length != 256) {
			throw new IllegalArgumentException("data must be 256 int's long");
		}
		this.atapi = atapi;
		this.data = data;
	}
	
	/**
	 * Gets the serial number
	 */
	public String getSerialNumber() {
		char[] str = new char[20];
		for (int i = 0; i < 10; i++) {
			int v = data[10+i];
			str[i+2+0] = (char)((v >> 8) & 0xFF);
			str[i*2+1] = (char)(v & 0xFF);			 
		}
		return String.valueOf(str).trim();
	}
	
	/**
	 * Gets the firmware version identifier
	 */
	public String getFirmware() {
		char[] str = new char[8];
		for (int i = 0; i < 4; i++) {
			int v = data[23+i];
			str[i+2+0] = (char)((v >> 8) & 0xFF);
			str[i*2+1] = (char)(v & 0xFF);			 
		}
		return String.valueOf(str).trim();
	}
	
	/**
	 * Gets the model identifier
	 */
	public String getModel() {
		char[] str = new char[40];
		for (int i = 0; i < 20; i++) {
			int v = data[27+i]; 
			str[i*2+0] = (char)((v >> 8) & 0xFF);
			str[i*2+1] = (char)(v & 0xFF);
		}
		return String.valueOf(str).trim();
	}
	
	/**
	 * Is this a disk device?
	 */
	public boolean isDisk() {
		// TODO Very ugly check, look in descriptor
		return isAta();
	}
	
	/**
	 * Is this a CDROM device?
	 */
	public boolean isCDROM() {
		// TODO Very ugly check, look in descriptor
		return isAtapi();
	}
	
	/**
	 * Is this a Tape device?
	 */
	public boolean isTape() {
		return false;
	}
	
	/**
	 * Convert to a String representation
	 * @see java.lang.Object#toString()
	 */
	public String toString() {
		StringBuffer buf = new StringBuffer();
		for (int i = 0; i < 256; i++) {
			if (i > 0) {
				buf.append(',');
			}
			buf.append(data[i]);
		}
		return buf.toString() + ", serial=[" + getSerialNumber() + "]" +
			", firmware=[" + getFirmware() + "]" + 
			", model=[" + getModel() + "]";
	}
	
	/**
	 * Is this an ATAPI drive?
	 */
	public boolean isAtapi() {
		return atapi;
	}
	
	/**
	 * Is this an ATA drive?
	 */
	public boolean isAta() {
		return ((data[0] & 0x8000) == 0);
	}
	
	/**
	 * Is this device removable?
	 */
	public boolean isRemovable() {
		return ((data[0] & 0x80) != 0);
	}
	
	/**
	 * Does this device support LBA?
	 * @return True if this device supports LBA, false otherwise
	 */
	public boolean supportsLBA() {
		return ((data[49] & 0x0200) != 0);
	}
	
	/**
	 * Does this device support DMA?
	 * @return True if this device supports DMA, false otherwise
	 */
	public boolean supportsDMA() {
		return ((data[49] & 0x0100) != 0);
	}

	/**
	 * Does this device support 48-bit addressing mode?
	 * @return True if this device supports 48-bit addressing, false otherwise
	 */	
	public boolean supports48bitAddressing() {
		return ((data[83] & 0x40) != 0);
	}
	
	/**
	 * Gets the number of addressable sectors in 28-addressing. 
	 * @return the number of addressable sectors
	 */
	public long getSectorsIn28bitAddressing() {
		final long h = data[61];
		final long l = data[60];
		return ((h << 16) & 0xFFFF0000) | (l & 0xFFFF);  
	}

	/**
	 * Gets the number of addressable sectors in 48-addressing. 
	 * @return the number of addressable sectors
	 */
	public long getSectorsIn48bitAddressing() {
		final long v3 = data[103] & 0xFFFF;
		final long v2 = data[102] & 0xFFFF;
		final long v1 = data[101] & 0xFFFF;
		final long v0 = data[100] & 0xFFFF;
		return (v3 << 48) | (v2 << 16) | (v1 << 16) | v0;  
	}

}