104 lines
3.9 KiB
Java
104 lines
3.9 KiB
Java
package com.bytezone.diskbrowser.applefile;
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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.HexFormatter;
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// -----------------------------------------------------------------------------------//
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public class BootSector extends AbstractSector
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// -----------------------------------------------------------------------------------//
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{
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private static final byte[] skew = { 0x00, 0x0D, 0x0B, 0x09, 0x07, 0x05, 0x03, 0x01,
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0x0E, 0x0C, 0x0A, 0x08, 0x06, 0x04, 0x02, 0x0F };
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private static final int SKEW_OFFSET = 0x4D;
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private static final int SKEW_OFFSET_2 = 0x3C; // DOS 4.x
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AssemblerProgram assembler1;
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AssemblerProgram assembler2;
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String name; // DOS or Prodos
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// ---------------------------------------------------------------------------------//
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public BootSector (Disk disk, byte[] buffer, String name, 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 BootSector (Disk disk, byte[] buffer, String name)
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// ---------------------------------------------------------------------------------//
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{
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super (disk, buffer);
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this.name = name;
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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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StringBuilder text = new StringBuilder ();
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if (assembler1 == null)
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{
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int flag = buffer[0] & 0xFF; // how many blocks to load
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if (flag == 1) // apple II
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{
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if (matches (buffer, SKEW_OFFSET, skew))
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{
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int newLen = 0x100 - (SKEW_OFFSET + skew.length);
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byte[] buf1 = new byte[0x4D];
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byte[] buf2 = new byte[newLen];
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System.arraycopy (buffer, 0, buf1, 0, SKEW_OFFSET);
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System.arraycopy (buffer, SKEW_OFFSET + skew.length, buf2, 0, newLen);
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assembler1 = new AssemblerProgram (name + " (first)", buf1, 0x800, 1);
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assembler2 = new AssemblerProgram (name + " (second)", buf2,
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SKEW_OFFSET + skew.length, 0);
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}
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else
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assembler1 = new AssemblerProgram (name + " Boot Loader", buffer, 0x00, 1);
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}
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else // apple III (SOS)
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{
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// byte[] newBuffer = new byte[buffer.length * 2];
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// System.arraycopy (buffer, 0, newBuffer, 0, buffer.length);
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// byte[] buf = disk.readSector (1);
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// System.arraycopy (buf, 0, newBuffer, buf.length, buf.length);
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// this was doubling the size of Pascal boot blocks - 06/08/2016
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// buffer = newBuffer;
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assembler1 = new AssemblerProgram (name + " Boot Loader", buffer, 0x00, 0);
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}
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}
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text.append (assembler1.getText ());
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if (assembler2 != null)
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{
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text.append ("\n\n");
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text.append (HexFormatter.formatNoHeader (buffer, SKEW_OFFSET, skew.length,
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0x800 + SKEW_OFFSET));
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text.append ("\n\n");
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text.append (assembler2.getText ());
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}
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return text.toString ();
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}
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// ---------------------------------------------------------------------------------//
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private boolean matches (byte[] buffer, int offset, byte[] test)
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// ---------------------------------------------------------------------------------//
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{
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if (test.length == 0 || test.length > buffer.length - offset)
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return false;
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for (int i = 0; i < test.length; i++)
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if (test[i] != buffer[offset++])
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return false;
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return true;
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}
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} |