103 lines
3.7 KiB
Java
Executable File
103 lines
3.7 KiB
Java
Executable File
package com.bytezone.diskbrowser.dos;
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import com.bytezone.diskbrowser.disk.AbstractSector;
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import com.bytezone.diskbrowser.disk.Disk;
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import com.bytezone.diskbrowser.disk.DiskAddress;
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import com.bytezone.diskbrowser.utilities.Utility;
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// -----------------------------------------------------------------------------------//
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class DosTSListSector extends AbstractSector
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// -----------------------------------------------------------------------------------//
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{
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private final String name;
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// ---------------------------------------------------------------------------------//
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DosTSListSector (String name, Disk disk, byte[] buffer, DiskAddress diskAddress)
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// ---------------------------------------------------------------------------------//
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{
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super (disk, buffer, diskAddress);
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this.name = name;
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}
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// ---------------------------------------------------------------------------------//
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public boolean isValid (DosDisk dosDisk)
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// ---------------------------------------------------------------------------------//
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{
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// what is the count of blocks? does it match? this sector can't tell, there
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// might be more than one TS list
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// validate the sector, throw an exception if invalid
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for (int i = 12; i < buffer.length; i += 2)
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{
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DiskAddress da = getValidAddress (buffer, i);
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if (da == null)
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{
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System.out.println ("Invalid sector address : null");
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break; // throw exception?
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}
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if (da.getBlockNo () > 0 && dosDisk.stillAvailable (da))
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{
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System.out.println ("Invalid sector address : " + da);
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break; // throw exception?
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}
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}
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return true;
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}
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// this is in too many places
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// ---------------------------------------------------------------------------------//
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protected DiskAddress getValidAddress (byte[] buffer, int offset)
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// ---------------------------------------------------------------------------------//
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{
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if (disk.isValidAddress (buffer[offset], buffer[offset + 1]))
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return disk.getDiskAddress (buffer[offset], buffer[offset + 1]);
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return null;
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}
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// ---------------------------------------------------------------------------------//
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@Override
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public String createText ()
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// ---------------------------------------------------------------------------------//
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{
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DiskAddress da = disk.getDiskAddress (buffer[1], buffer[2]);
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if (da == null)
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return String.format ("Invalid address: %02X %02X", buffer[1], buffer[2]);
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String msg = da.matches (diskAddress) ? " (circular reference)" : "";
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StringBuilder text = getHeader ("TS List Sector : " + name);
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addText (text, buffer, 0, 1, "Not used");
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addText (text, buffer, 1, 2, "Next TS list track/sector" + msg);
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if ((buffer[3] != 0 || buffer[4] != 0) // not supposed to be used
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// Diags2E.dsk stores its own sector address here
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&& (diskAddress.getTrackNo () == (buffer[3] & 0xFF)
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&& diskAddress.getSectorNo () == (buffer[4] & 0xFF)))
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addText (text, buffer, 3, 2, "Self-reference");
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else
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addText (text, buffer, 3, 2, "Not used");
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addTextAndDecimal (text, buffer, 5, 2, "Sector base number");
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addText (text, buffer, 7, 4, "Not used");
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addText (text, buffer, 11, 1, "Not used");
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int sectorBase = Utility.getShort (buffer, 5);
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for (int i = 12; i <= 255; i += 2)
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{
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if (buffer[i] == 0 && buffer[i + 1] == 0)
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msg = "";
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else
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{
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String msg2 = buffer[i] == 0x40 ? " - track zero" : "";
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msg = String.format ("Track/sector of file sector %04X (%<,d)%s",
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((i - 12) / 2 + sectorBase), msg2);
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}
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addText (text, buffer, i, 2, msg);
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}
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text.deleteCharAt (text.length () - 1);
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return text.toString ();
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}
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} |