mirror of
https://github.com/dmolony/DiskBrowser.git
synced 2024-06-29 21:29:36 +00:00
361 lines
11 KiB
Java
361 lines
11 KiB
Java
package com.bytezone.diskbrowser.nib;
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import java.io.BufferedInputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.List;
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import com.bytezone.diskbrowser.utilities.HexFormatter;
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import com.bytezone.diskbrowser.utilities.Utility;
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public class WozFile
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{
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private static final byte[] WOZ1_FILE_HEADER =
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{ 0x57, 0x4F, 0x5A, 0x31, (byte) 0xFF, 0x0A, 0x0D, 0x0A };
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private static final byte[] WOZ2_FILE_HEADER =
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{ 0x57, 0x4F, 0x5A, 0x32, (byte) 0xFF, 0x0A, 0x0D, 0x0A };
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private static final int TRK_SIZE = 0x1A00;
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private static final int INFO_SIZE = 0x3C;
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private static final int TMAP_SIZE = 0xA0;
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private static final int DATA_SIZE = TRK_SIZE - 10;
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private final boolean debug = true;
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private final boolean dump = true;
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private int diskType; // 5.25 or 3.5
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private int wozVersion;
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private int bootSectorFormat;
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public final File file;
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byte[] diskBuffer;
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private final MC3470 mc3470 = new MC3470 ();
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private final List<NibbleTrack> nibbleTracks = new ArrayList<> (40);
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// ---------------------------------------------------------------------------------//
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// constructor
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// ---------------------------------------------------------------------------------//
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public WozFile (File file) throws DiskNibbleException
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{
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this.file = file;
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byte[] buffer = readFile ();
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boolean valid = false;
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if (matches (WOZ1_FILE_HEADER, buffer))
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wozVersion = 1;
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else if (matches (WOZ2_FILE_HEADER, buffer))
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wozVersion = 2;
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else
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{
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System.out.println (HexFormatter.format (buffer, 0, 20));
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throw new DiskNibbleException ("Header error");
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}
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int checksum1 = readInt (buffer, 8, 4);
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int checksum2 = Utility.crc32 (buffer, 12, buffer.length - 12);
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if (checksum1 != checksum2)
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{
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System.out.printf ("Stored checksum : %08X%n", checksum1);
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System.out.printf ("Calculated checksum : %08X%n", checksum2);
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throw new DiskNibbleException ("Checksum error");
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}
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int ptr = 12;
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read: while (ptr < buffer.length)
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{
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String chunkId = new String (buffer, ptr, 4);
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ptr += 4;
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int chunkSize = readInt (buffer, ptr, 4);
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ptr += 4;
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if (debug)
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{
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System.out.printf ("Offset : %06X%n", ptr - 8);
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System.out.printf ("Chunk ID : %s%n", chunkId);
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System.out.printf ("Chunk size: %,d%n", chunkSize);
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}
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if ("INFO".equals (chunkId))
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{
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if (debug)
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{
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int diskType = buffer[ptr + 1] & 0xFF;
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String diskTypeText = diskType == 1 ? "5.25" : diskType == 2 ? "3.5" : "??";
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System.out.println ();
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System.out.printf ("Version ........... %02X%n", buffer[ptr]);
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System.out.printf ("Disk type ......... %02X %s%n", diskType, diskTypeText);
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System.out.printf ("Write protected ... %02X%n", buffer[ptr + 2]);
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System.out.printf ("Synchronised ...... %02X%n", buffer[ptr + 3]);
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System.out.printf ("Cleaned ........... %02X%n", buffer[ptr + 4]);
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System.out.printf ("Creator ........... %s%n",
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new String (buffer, ptr + 5, 32).trim ());
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if (wozVersion > 1)
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{
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int bootFormat = buffer[ptr + 38] & 0xFF;
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String bootFormatText = bootFormat == 1 ? "16 sector"
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: bootFormat == 2 ? "13 sector" : bootFormat == 3 ? "Both" : "??";
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System.out.printf ("Disk sides ........ %02X%n", buffer[ptr + 37]);
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System.out.printf ("Boot format ....... %02X %s%n", bootFormat,
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bootFormatText);
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System.out.printf ("Optimal timing .... %02X%n", buffer[ptr + 39]);
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System.out.printf ("Compatible flags .. %04X%n",
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readInt (buffer, ptr + 40, 2));
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System.out.printf ("Minimum RAM ....... %04X%n",
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readInt (buffer, ptr + 42, 2));
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System.out.printf ("Largest track ..... %04X%n",
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readInt (buffer, ptr + 44, 2));
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}
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System.out.println ();
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}
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diskType = buffer[ptr + 1] & 0xFF;
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if (wozVersion > 1)
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bootSectorFormat = buffer[ptr + 38] & 0xFF;
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ptr += INFO_SIZE;
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}
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else if ("TMAP".equals (chunkId))
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{
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if (debug)
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{
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for (int track = 0; track < 40; track++)
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{
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for (int qtr = 0; qtr < 4; qtr++)
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System.out.printf ("%02X ", buffer[ptr++]);
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System.out.println ();
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}
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System.out.println ();
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}
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else
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ptr += TMAP_SIZE;
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}
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else if ("TRKS".equals (chunkId))
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{
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if (debug)
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{
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System.out.println ("***********************************************");
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System.out.printf ("* Disk ......... %s%n", file.getName ());
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System.out.println ("***********************************************");
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}
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if (wozVersion == 1)
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{
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int tracks = chunkSize / TRK_SIZE;
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for (int trackNo = 0; trackNo < tracks; trackNo++)
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{
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int bytesUsed = readInt (buffer, ptr + DATA_SIZE, 2);
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int bitCount = readInt (buffer, ptr + DATA_SIZE + 2, 2);
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if (debug)
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{
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System.out.println ("***************************************");
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System.out.printf ("* Track ......... %,6d of %,6d *%n", trackNo,
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tracks);
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System.out.printf ("* Bytes used .... %,6d *%n", bytesUsed);
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System.out.printf ("* Bit count .... %,6d *%n", bitCount);
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System.out.println ("***************************************");
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}
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try
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{
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// nibbleTracks.add (mc3470.getNibbleTrack (buffer, ptr, bytesUsed, bitCount));
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List<RawDiskSector> diskSectors =
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mc3470.readTrack (buffer, ptr, bytesUsed, bitCount);
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if (trackNo == 0) // create disk buffer
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{
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if (mc3470.is13Sector ())
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diskBuffer = new byte[35 * 13 * 256];
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else if (mc3470.is16Sector ())
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diskBuffer = new byte[35 * 16 * 256];
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else
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{
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System.out.println ("unknown disk format");
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break read;
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}
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}
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mc3470.storeSectors (diskSectors, diskBuffer);
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}
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catch (Exception e)
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{
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System.out.println (e);
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break read;
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}
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ptr += TRK_SIZE;
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}
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}
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else
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{
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diskBuffer = new byte[(bootSectorFormat == 2 ? 13 : 16) * 35 * 256];
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for (int trackNo = 0; trackNo < 160; trackNo++)
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{
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int p = 256 + trackNo * 8;
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int startingBlock = readInt (buffer, p, 2);
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int blockCount = readInt (buffer, p + 2, 2);
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int bitCount = readInt (buffer, p + 4, 4);
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if (debug)
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{
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System.out.println ("******************************");
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System.out.printf ("* Track ......... %,6d *%n", trackNo);
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System.out.printf ("* Start block ... %,6d *%n", startingBlock);
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System.out.printf ("* Block count ... %,6d *%n", blockCount);
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System.out.printf ("* Bit count .... %,6d *%n", bitCount);
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System.out.println ("******************************");
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}
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if (startingBlock == 0)
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break;
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try
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{
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// nibbleTracks.add (mc3470.getNibbleTrack (buffer, ptr, bytesUsed, bitCount));
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List<RawDiskSector> diskSectors = mc3470.readTrack (buffer,
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startingBlock * 512, blockCount * 512, bitCount);
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for (RawDiskSector rawDiskSector : diskSectors)
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{
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System.out.println (rawDiskSector);
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rawDiskSector.dump ();
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}
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mc3470.storeSectors (diskSectors, diskBuffer);
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}
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catch (Exception e)
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{
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System.out.println (e);
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break read;
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}
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}
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ptr += chunkSize;
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}
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}
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else if ("META".equals (chunkId))
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{
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// System.out.printf ("[%s] %08X%n", chunkId, chunkSize);
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// System.out.println (HexFormatter.format (buffer, ptr, chunkSize));
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ptr += chunkSize;
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}
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else
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{
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System.out.printf ("Unknown %08X%n", chunkSize);
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ptr += chunkSize;
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}
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}
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// if (!valid)
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// readNibbleTracks (buffer);
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}
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// ---------------------------------------------------------------------------------//
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// readNibbleTracks
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// ---------------------------------------------------------------------------------//
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private void readNibbleTracks (byte[] buffer)
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{
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for (int track = 0; track < 35; track++)
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{
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int ptr = track * 6656 + 256;
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int bytesUsed = readInt (buffer, ptr + DATA_SIZE, 2);
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int bitCount = readInt (buffer, ptr + DATA_SIZE + 2, 2);
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NibbleTrack nibbleTrack = mc3470.getNibbleTrack (buffer, ptr, bytesUsed, bitCount);
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nibbleTracks.add (nibbleTrack);
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}
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}
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// ---------------------------------------------------------------------------------//
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// getSectorsPerTrack
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// ---------------------------------------------------------------------------------//
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public int getSectorsPerTrack ()
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{
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return mc3470.is13Sector () ? 13 : mc3470.is16Sector () ? 16 : 0;
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}
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// ---------------------------------------------------------------------------------//
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// readInt
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// ---------------------------------------------------------------------------------//
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private int readInt (byte[] buffer, int offset, int length)
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{
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int shift = 0;
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int value = 0;
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for (int i = 0; i < length; i++)
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{
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value |= (buffer[offset + i] & 0xFF) << shift;
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shift += 8;
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}
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return value;
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}
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// ---------------------------------------------------------------------------------//
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// getDiskBuffer
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// ---------------------------------------------------------------------------------//
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public byte[] getDiskBuffer ()
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{
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return diskBuffer;
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}
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// ---------------------------------------------------------------------------------//
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// readFile
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// ---------------------------------------------------------------------------------//
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private byte[] readFile ()
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{
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try
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{
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BufferedInputStream in = new BufferedInputStream (new FileInputStream (file));
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byte[] buffer = in.readAllBytes ();
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in.close ();
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return buffer;
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}
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catch (IOException e)
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{
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e.printStackTrace ();
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return null;
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}
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}
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void dump (int trackNo)
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{
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}
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// ---------------------------------------------------------------------------------//
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// matches
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// ---------------------------------------------------------------------------------//
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private boolean matches (byte[] b1, byte[] b2)
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{
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for (int i = 0; i < b1.length; i++)
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if (b1[i] != b2[i])
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return false;
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return true;
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}
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public static void main (String[] args)
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{
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File file = new File ("/Users/denismolony/code/python/wozardry-2.0/bill.woz");
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try
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{
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WozFile wozFile = new WozFile (file);
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}
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catch (DiskNibbleException e)
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{
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e.printStackTrace ();
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}
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}
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}
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