fileblockdevice.java

JPC: x86 PC Hardware Emulator. 牛津大学开发的一个纯JAVA的x86系统结构硬件模拟器。

        header[pos++] = (byte) 0x00;//this and following 3 bytes are irrelevant for FAT32 (N/A)
        header[pos++] = (byte) 0x00;
        header[pos++] = (byte) 0x00;
        header[pos++] = (byte) 0x00;
        header[pos++] = (byte) 0xF8;//do not change
        header[pos++] = (byte) 0x00;//N/A
        header[pos++] = (byte) 0x00;//N/A
        
        System.arraycopy(toByteArray(sectorsPerTrack,1),0,header,pos++,1);
        header[pos++] = (byte) 0x00;//                       byte offset 0x19
	System.arraycopy(toByteArray(heads,1),0,header,pos++,1);
	header[pos++] = (byte) 0x00;//                         byte offset 0x1B
	System.arraycopy(toByteArray(hiddenSectors,4),0,header,pos++,4);//number of hidden sectors (63 on non partitioned media)  byte offset 0x1C
	pos=pos+3;
        
	//byte offset 0x20  = total number of sectors in partition
	System.arraycopy(toByteArray(totalSectors,4),0,header,pos++,4);
	pos=pos+3;
    
	//byte offset 0x24  --  number of sectors per FAT = 520 for 520MB drive (4 bytes)
	System.arraycopy(toByteArray(sectorsPerFAT,4),0,header,pos++,4);
	pos=pos+3;
	header[pos++] = (byte) 0x00;//byte offset 0x28  --  *****this could be wrong, tells which FAT is active (http://home.teleport.com/~brainy/fat32.htm)
        header[pos++] = (byte) 0x00;//byte offset 0x29

        header[pos++] = (byte) 0x00;//byte offset 0x2A  -- this and the next seem irrelevant (FAT32 version) (possibly set to 0)
        header[pos++] = (byte) 0x00;//byte offset 0x2B

	//byte offset 0x2C  -- cluster number of the start of the root directory (4 bytes)
	System.arraycopy(toByteArray(rootStartCluster,4),0,header,pos++,4);
	pos=pos+3;
	//byte offset 0x30  -- sector number of FSINFO sector (is this 1 or two bytes??? although it doesn't matter)
	System.arraycopy(toByteArray(fsinfoSector,1),0,header,pos++,1);
        header[pos++] = (byte) 0x00;//byte offset 0x31
	//byte offset 0x32  -- sector number of backup boot sector
	System.arraycopy(toByteArray(backupBootSector,1),0,header,pos++,1);
        header[pos++] = (byte) 0x00;//byte offset 0x33

        header[pos++] = (byte) 0x00;//byte offset 0x34  -- 12 bytes of N/A
        header[pos++] = (byte) 0x00;//byte offset 0x35
        header[pos++] = (byte) 0x00;
        header[pos++] = (byte) 0x00;
        header[pos++] = (byte) 0x00;
        header[pos++] = (byte) 0x00;
        header[pos++] = (byte) 0x00;
        header[pos++] = (byte) 0x00;
        header[pos++] = (byte) 0x00;
        header[pos++] = (byte) 0x00;
        header[pos++] = (byte) 0x00;
        header[pos++] = (byte) 0x00;

        header[pos++] = (byte) 0x80;//byte offset 0x40
        header[pos++] = (byte) 0x00;
        header[pos++] = (byte) 0x29;//do not change (extended signature)

        header[pos++] = (byte) 0x26;//these four are the serial number of the partition
        header[pos++] = (byte) 0x59;
        header[pos++] = (byte) 0x41;
        header[pos++] = (byte) 0x31;

        header[pos++] = (byte) 0x49;
        header[pos++] = (byte) 0x41;
        header[pos++] = (byte) 0x4E;
        header[pos++] = (byte) 0x52;
        header[pos++] = (byte) 0x4F;
        header[pos++] = (byte) 0x43;
        header[pos++] = (byte) 0x4B;
        header[pos++] = (byte) 0x53;
        header[pos++] = (byte) 0x46;
        header[pos++] = (byte) 0x33;
        header[pos++] = (byte) 0x32;

        header[pos++] = (byte) 0x46;//byte offset 0x52  F
        header[pos++] = (byte) 0x41;//byte offset 0x37  A
        header[pos++] = (byte) 0x54;//byte offset 0x38  T
        header[pos++] = (byte) 0x33;//byte offset 0x39  3
        header[pos++] = (byte) 0x32;//byte offset 0x3A  2
        header[pos++] = (byte) 0x20;//byte offset 0x3B
        header[pos++] = (byte) 0x20;//byte offset 0x3C
        header[pos++] = (byte) 0x20;//byte offset 0x3D

        //Need to copy in the bootstrap code (420 bytes)
        byte[] bootstrap = {
	    (byte)0x33, (byte)0xC9, (byte)0x8E, (byte)0xD1, (byte)0xBC, (byte)0xF4, (byte)0x7B, (byte)0x8E,
	    (byte)0xC1, (byte)0x8E, (byte)0xD9, (byte)0xBD, (byte)0x00, (byte)0x7C, (byte)0x88, (byte)0x4E,
	    (byte)0x02, (byte)0x8A, (byte)0x56, (byte)0x40, (byte)0xB4, (byte)0x08, (byte)0xCD, (byte)0x13,
	    (byte)0x73, (byte)0x05, (byte)0xB9, (byte)0xFF, (byte)0xFF, (byte)0x8A, (byte)0xF1, (byte)0x66,
	    (byte)0x0F, (byte)0xB6, (byte)0xC6, (byte)0x40, (byte)0x66, (byte)0x0F, (byte)0xB6, (byte)0xD1,
	    (byte)0x80, (byte)0xE2, (byte)0x3F, (byte)0xF7, (byte)0xE2, (byte)0x86, (byte)0xCD, (byte)0xC0,
	    (byte)0xED, (byte)0x06, (byte)0x41, (byte)0x66, (byte)0x0F, (byte)0xB7, (byte)0xC9, (byte)0x66,
	    (byte)0xF7, (byte)0xE1, (byte)0x66, (byte)0x89, (byte)0x46, (byte)0xF8, (byte)0x83, (byte)0x7E,
	    (byte)0x16, (byte)0x00, (byte)0x75, (byte)0x38, (byte)0x83, (byte)0x7E, (byte)0x2A, (byte)0x00,
	    (byte)0x77, (byte)0x32, (byte)0x66, (byte)0x8B, (byte)0x46, (byte)0x1C, (byte)0x66, (byte)0x83,
	    (byte)0xC0, (byte)0x0C, (byte)0xBB, (byte)0x00, (byte)0x80, (byte)0xB9, (byte)0x01, (byte)0x00,
	    (byte)0xE8, (byte)0x2B, (byte)0x00, (byte)0xE9, (byte)0x48, (byte)0x03, (byte)0xA0, (byte)0xFA,
	    (byte)0x7D, (byte)0xB4, (byte)0x7D, (byte)0x8B, (byte)0xF0, (byte)0xAC, (byte)0x84, (byte)0xC0,
	    (byte)0x74, (byte)0x17, (byte)0x3C, (byte)0xFF, (byte)0x74, (byte)0x09, (byte)0xB4, (byte)0x0E,
	    (byte)0xBB, (byte)0x07, (byte)0x00, (byte)0xCD, (byte)0x10, (byte)0xEB, (byte)0xEE, (byte)0xA0,
	    (byte)0xFB, (byte)0x7D, (byte)0xEB, (byte)0xE5, (byte)0xA0, (byte)0xF9, (byte)0x7D, (byte)0xEB,
	    (byte)0xE0, (byte)0x98, (byte)0xCD, (byte)0x16, (byte)0xCD, (byte)0x19, (byte)0x66, (byte)0x60,
	    (byte)0x66, (byte)0x3B, (byte)0x46, (byte)0xF8, (byte)0x0F, (byte)0x82, (byte)0x4A, (byte)0x00,
	    (byte)0x66, (byte)0x6A, (byte)0x00, (byte)0x66, (byte)0x50, (byte)0x06, (byte)0x53, (byte)0x66,
	    (byte)0x68, (byte)0x10, (byte)0x00, (byte)0x01, (byte)0x00, (byte)0x80, (byte)0x7E, (byte)0x02,
	    (byte)0x00, (byte)0x0F, (byte)0x85, (byte)0x20, (byte)0x00, (byte)0xB4, (byte)0x41, (byte)0xBB,
	    (byte)0xAA, (byte)0x55, (byte)0x8A, (byte)0x56, (byte)0x40, (byte)0xCD, (byte)0x13, (byte)0x0F,
	    (byte)0x82, (byte)0x1C, (byte)0x00, (byte)0x81, (byte)0xFB, (byte)0x55, (byte)0xAA, (byte)0x0F,
	    (byte)0x85, (byte)0x14, (byte)0x00, (byte)0xF6, (byte)0xC1, (byte)0x01, (byte)0x0F, (byte)0x84,
	    (byte)0x0D, (byte)0x00, (byte)0xFE, (byte)0x46, (byte)0x02, (byte)0xB4, (byte)0x42, (byte)0x8A,
	    (byte)0x56, (byte)0x40, (byte)0x8B, (byte)0xF4, (byte)0xCD, (byte)0x13, (byte)0xB0, (byte)0xF9,
	    (byte)0x66, (byte)0x58, (byte)0x66, (byte)0x58, (byte)0x66, (byte)0x58, (byte)0x66, (byte)0x58,
	    (byte)0xEB, (byte)0x2A, (byte)0x66, (byte)0x33, (byte)0xD2, (byte)0x66, (byte)0x0F, (byte)0xB7,
	    (byte)0x4E, (byte)0x18, (byte)0x66, (byte)0xF7, (byte)0xF1, (byte)0xFE, (byte)0xC2, (byte)0x8A,
	    (byte)0xCA, (byte)0x66, (byte)0x8B, (byte)0xD0, (byte)0x66, (byte)0xC1, (byte)0xEA, (byte)0x10,
	    (byte)0xF7, (byte)0x76, (byte)0x1A, (byte)0x86, (byte)0xD6, (byte)0x8A, (byte)0x56, (byte)0x40,
	    (byte)0x8A, (byte)0xE8, (byte)0xC0, (byte)0xE4, (byte)0x06, (byte)0x0A, (byte)0xCC, (byte)0xB8,
	    (byte)0x01, (byte)0x02, (byte)0xCD, (byte)0x13, (byte)0x66, (byte)0x61, (byte)0x0F, (byte)0x82,
	    (byte)0x54, (byte)0xFF, (byte)0x81, (byte)0xC3, (byte)0x00, (byte)0x02, (byte)0x66, (byte)0x40,
	    (byte)0x49, (byte)0x0F, (byte)0x85, (byte)0x71, (byte)0xFF, (byte)0xC3, (byte)0x4E, (byte)0x54,
	    (byte)0x4C, (byte)0x44, (byte)0x52, (byte)0x20, (byte)0x20, (byte)0x20, (byte)0x20, (byte)0x20,
	    (byte)0x20, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
	    (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
	    (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
	    (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
	    (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
	    (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00,
	    (byte)0x00, (byte)0x00, (byte)0x0D, (byte)0x0A, (byte)0x52, (byte)0x65, (byte)0x6D, (byte)0x6F,
	    (byte)0x76, (byte)0x65, (byte)0x20, (byte)0x64, (byte)0x69, (byte)0x73, (byte)0x6B, (byte)0x73,
	    (byte)0x20, (byte)0x6F, (byte)0x72, (byte)0x20, (byte)0x6F, (byte)0x74, (byte)0x68, (byte)0x65,
	    (byte)0x72, (byte)0x20, (byte)0x6D, (byte)0x65, (byte)0x64, (byte)0x69, (byte)0x61, (byte)0x2E,
	    (byte)0xFF, (byte)0x0D, (byte)0x0A, (byte)0x44, (byte)0x69, (byte)0x73, (byte)0x6B, (byte)0x20,
	    (byte)0x65, (byte)0x72, (byte)0x72, (byte)0x6F, (byte)0x72, (byte)0xFF, (byte)0x0D, (byte)0x0A,
	    (byte)0x50, (byte)0x72, (byte)0x65, (byte)0x73, (byte)0x73, (byte)0x20, (byte)0x61, (byte)0x6E,
	    (byte)0x79, (byte)0x20, (byte)0x6B, (byte)0x65, (byte)0x79, (byte)0x20, (byte)0x74, (byte)0x6F,
	    (byte)0x20, (byte)0x72, (byte)0x65, (byte)0x73, (byte)0x74, (byte)0x61, (byte)0x72, (byte)0x74,
	    (byte)0x0D, (byte)0x0A, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0xAC,
	    (byte)0xCB, (byte)0xD8, (byte)0x00, (byte)0x00
	};

        for(int i=0;i<bootstrap.length;i++)
            header[pos++] = bootstrap[i];
        
        header[0x1FE] = (byte) 0x55;
        header[0x1FE + 1] = (byte) 0xAA;
        
        //Now do the second sector, the FSINFO sector
        header2 = new byte[512];
        pos=0;

        header2[pos++] = (byte) 0x52;
        header2[pos++] = (byte) 0x52;
        header2[pos++] = (byte) 0x61;
        header2[pos++] = (byte) 0x41;

        for(int i=0;i<480;i++)
            header2[pos++] = (byte) 0x00;

        header2[pos++] = (byte) 0x72;
        header2[pos++] = (byte) 0x72;
        header2[pos++] = (byte) 0x41;
        header2[pos++] = (byte) 0x61;

        //number of free clusters (4 bytes) set to FFFFFFFF if unknown
        header2[pos++] = (byte) 0xFF;
        header2[pos++] = (byte) 0xFF;
        header2[pos++] = (byte) 0xFF;
        header2[pos++] = (byte) 0xFF;

        //cluster number of most recently allocated cluster (4 bytes)
        System.arraycopy(toByteArray(lastAllocatedCluster,4),0,header,pos++,4);
	pos=pos+3;

        for(int i=0;i<14;i++)
            header2[pos++] = (byte) 0x00;

        header2[0x1FE] = (byte) 0x55;
        header2[0x1FE + 1] = (byte) 0xAA;

	//**************************************************************************************

        //FAT1  at sector 32
	// set up first 8 bytes of FAT
	byte[] initialbuffer = {(byte) 0xF8,(byte) 0xFF,(byte) 0xFF,(byte) 0x0F,(byte) 0xFF,(byte) 0xFF,(byte) 0xFF,(byte) 0x0F};
	byte[] endmark = {(byte) 0xFF,(byte) 0xFF,(byte) 0xFF,(byte) 0xFF};
	System.arraycopy(initialbuffer, 0,FAT,0, 8);

	rootSizeClusters = (int) (rootSize-1)/sectorsPerCluster + 1;
	// put in root directory
	for(int i = 0;i < rootSizeClusters-1 ;i++)
            System.arraycopy(toByteArray((long) 3+i,(int) 4),0,FAT,4*(i+2),4);
	// put in end of root directory
	System.arraycopy(endmark,0,FAT, rootSizeClusters + 1 , 4);

	// put in file
	fileSizeClusters = (int) (fileSizeSectors-1)/sectorsPerCluster+1;
	for(int i = rootSizeClusters + 2 ; i < rootSizeClusters + 1 + fileSizeClusters ; i++)
            System.arraycopy(toByteArray((long) 1+i ,(int) 4), 0, FAT, 4*i, 4);

	//put in end of file
	System.arraycopy(endmark,0,FAT, rootSizeClusters + 1 + fileSizeClusters , 4);

	//**************************************************************************************
	//make root directory
	rootdir=new byte[rootSizeClusters * sectorsPerCluster * bytesPerSector];
	for (int i=0; i<rootdir.length;i++){
	    rootdir[i]=(byte) 0x00;
	}

	//first file entry - points to nothing. this is the volume label
	String volumelabel = "IANROCKSF32";
	System.arraycopy(volumelabel.getBytes(),0,rootdir,0,11);
	rootdir[11]=(byte) 0x08;

	//first real file entry
	int startByte = 32;
	String filename = source.getName();
	pattern = Pattern.compile("(\\w*).(\\w*)");
        matcher = pattern.matcher(filename);
	matcher.find();
	String name = matcher.group(1);
	String ext = matcher.group(2);

//	System.out.println(name +"." + ext + ". length is " + name.length());

	//put filename into file entry
	System.arraycopy(name.getBytes(),0,rootdir,startByte,name.length());
	//	\w{0,8}.\w{1,3}
	//put in blank space after filename if it is less than 8 characters
	for (int i =name.length(); i< 8;i++){
	    rootdir[startByte+i]=(byte) 0x20;
	}
	System.arraycopy(ext.getBytes(),0,rootdir,startByte + 8,ext.length());
	rootdir[startByte+11]=(byte) 0x20;  //Attrib Byte

	//put in starting cluster (high 2 bytes)
	System.arraycopy(toByteArray((rootSizeClusters+2)>>>16,2),0,rootdir,startByte + 20,2);

	//put in starting cluster (low 2 bytes)
	System.arraycopy(toByteArray((rootSizeClusters+2) & 0xFFFF,2),0,rootdir,startByte + 26,2);

	//put in file size in bytes 
	System.arraycopy(toByteArray(raf.length(),4),0,rootdir,startByte + 28,4);

	//*************************************************************************************
        //Pad out the first 32 sectors and include copy of bootsector and FSINFO sector
	empty = new byte[512];
	for(int i=0;i<512;i++){