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tidying
This commit is contained in:
Denis Molony
parent
ca71a7e5bd
commit
285c87938e
@ -1,21 +1,16 @@
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package com.bytezone.diskbrowser.disk;
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import java.io.File;
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public class Nibblizer
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class Nibblizer
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{
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static byte[] addressPrologue = { (byte) 0xD5, (byte) 0xAA, (byte) 0x96 };
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static byte[] dataPrologue = { (byte) 0xD5, (byte) 0xAA, (byte) 0xAD };
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static byte[] epilogue = { (byte) 0xDE, (byte) 0xAA, (byte) 0xEB };
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private static byte[] addressPrologue = { (byte) 0xD5, (byte) 0xAA, (byte) 0x96 };
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private static byte[] dataPrologue = { (byte) 0xD5, (byte) 0xAA, (byte) 0xAD };
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private static byte[] epilogue = { (byte) 0xDE, (byte) 0xAA, (byte) 0xEB };
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private static int[][] interleave =
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{ { 0, 8, 1, 9, 2, 10, 3, 11, 4, 12, 5, 13, 6, 14, 7, 15 },
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{ 0, 8, 1, 9, 2, 10, 3, 11, 4, 12, 5, 13, 6, 14, 7, 15 } };
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private static int[] interleave =
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{ 0, 8, 1, 9, 2, 10, 3, 11, 4, 12, 5, 13, 6, 14, 7, 15 };
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static final int DOS = 0;
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static final int PRODOS = 1;
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static final int BLOCK_SIZE = 256;
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static final int TRACK_SIZE = 4096;
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private static final int BLOCK_SIZE = 256;
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private static final int TRACK_SIZE = 4096;
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private static final int RAW_BUFFER_SIZE = 342;
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private static final int BUFFER_WITH_CHECKSUM_SIZE = RAW_BUFFER_SIZE + 1;
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@ -35,60 +30,6 @@ public class Nibblizer
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private static byte[] readTranslateTable = new byte[106]; // skip first 150 blanks
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// this array is just here for testing - it matches the example in Beneath Apple Prodos
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private static byte[] testData =
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{ (byte) 0x00, (byte) 0x00, (byte) 0x03, (byte) 0x00, (byte) 0xFA, (byte) 0x55,
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(byte) 0x53, (byte) 0x45, (byte) 0x52, (byte) 0x53, (byte) 0x2E, (byte) 0x44,
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(byte) 0x49, (byte) 0x53, (byte) 0x4B, (byte) 0x00, //
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(byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
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(byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
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(byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, //
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(byte) 0x00, (byte) 0x00, (byte) 0xC3, (byte) 0x27, (byte) 0x0D, (byte) 0x09,
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(byte) 0x00, (byte) 0x06, (byte) 0x00, (byte) 0x18, (byte) 0x01, (byte) 0x26,
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(byte) 0x50, (byte) 0x52, (byte) 0x4F, (byte) 0x44, //
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(byte) 0x4F, (byte) 0x53, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
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(byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0xFF,
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(byte) 0x08, (byte) 0x00, (byte) 0x1F, (byte) 0x00, //
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(byte) 0x00, (byte) 0x3C, (byte) 0x00, (byte) 0x21, (byte) 0xA8, (byte) 0x00,
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(byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x21, (byte) 0x00, (byte) 0x20,
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(byte) 0x21, (byte) 0xA8, (byte) 0x00, (byte) 0x00, //
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(byte) 0x02, (byte) 0x00, (byte) 0x2C, (byte) 0x42, (byte) 0x41, (byte) 0x53,
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(byte) 0x49, (byte) 0x43, (byte) 0x2E, (byte) 0x53, (byte) 0x59, (byte) 0x53,
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(byte) 0x54, (byte) 0x45, (byte) 0x4D, (byte) 0x00, //
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(byte) 0x00, (byte) 0x00, (byte) 0xFF, (byte) 0x27, (byte) 0x00, (byte) 0x15,
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(byte) 0x00, (byte) 0x00, (byte) 0x28, (byte) 0x00, (byte) 0x6F, (byte) 0xA7,
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(byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, //
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(byte) 0x21, (byte) 0x00, (byte) 0x20, (byte) 0x6F, (byte) 0xA7, (byte) 0x00,
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(byte) 0x00, (byte) 0x02, (byte) 0x00, (byte) 0x25, (byte) 0x46, (byte) 0x49,
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(byte) 0x4C, (byte) 0x45, (byte) 0x52, (byte) 0x00, //
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(byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
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(byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0xFF, (byte) 0x3C, (byte) 0x00,
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(byte) 0x33, (byte) 0x00, (byte) 0x00, (byte) 0x64, //
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(byte) 0x00, (byte) 0x21, (byte) 0xA8, (byte) 0x00, (byte) 0x00, (byte) 0x00,
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(byte) 0x00, (byte) 0x21, (byte) 0x6E, (byte) 0x01, (byte) 0x21, (byte) 0xA8,
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(byte) 0x00, (byte) 0x00, (byte) 0x02, (byte) 0x00, //
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(byte) 0x27, (byte) 0x43, (byte) 0x4F, (byte) 0x4E, (byte) 0x56, (byte) 0x45,
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(byte) 0x52, (byte) 0x54, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
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(byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, //
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(byte) 0xFF, (byte) 0x6F, (byte) 0x00, (byte) 0x2A, (byte) 0x00, (byte) 0x01,
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(byte) 0x50, (byte) 0x00, (byte) 0x61, (byte) 0xA7, (byte) 0x00, (byte) 0x00,
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(byte) 0x00, (byte) 0x00, (byte) 0x21, (byte) 0x00, //
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(byte) 0x20, (byte) 0x61, (byte) 0xA7, (byte) 0x00, (byte) 0x00, (byte) 0x02,
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(byte) 0x00, (byte) 0x27, (byte) 0x53, (byte) 0x54, (byte) 0x41, (byte) 0x52,
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(byte) 0x54, (byte) 0x55, (byte) 0x50, (byte) 0x00, //
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(byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
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(byte) 0x00, (byte) 0xFC, (byte) 0x99, (byte) 0x00, (byte) 0x18, (byte) 0x00,
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(byte) 0xC9, (byte) 0x2C, (byte) 0x00, (byte) 0x4F, //
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(byte) 0xA7, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x21,
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(byte) 0x01, (byte) 0x08, (byte) 0x4F, (byte) 0xA7, (byte) 0x00, (byte) 0x00,
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(byte) 0x02, (byte) 0x00, (byte) 0x25, (byte) 0x4D, //
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(byte) 0x4F, (byte) 0x49, (byte) 0x52, (byte) 0x45, (byte) 0x00, (byte) 0x00,
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(byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
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(byte) 0x00, (byte) 0x00, (byte) 0xFC, (byte) 0xB1 };
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static
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{
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for (int i = 0; i < writeTranslateTable.length; i++)
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@ -104,25 +45,7 @@ public class Nibblizer
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private final byte[] encode1 = new byte[RAW_BUFFER_SIZE];
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private final byte[] encode2 = new byte[BUFFER_WITH_CHECKSUM_SIZE];
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private final File file;
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public Nibblizer (File file)
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{
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this.file = file;
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if (false) // test with the Beneath Apple Prodos example
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{
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byte[] testBuffer = decode6and2 (encode6and2 (testData), 0);
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for (int i = 0; i < BLOCK_SIZE; i++)
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if (testData[i] != testBuffer[i])
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System.out.println ("bollocks");
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return;
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}
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}
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public boolean processTrack (int trackNo, byte[] buffer, byte[] diskBuffer)
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boolean processTrack (int trackNo, byte[] buffer, byte[] diskBuffer)
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{
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int ptr = 0;
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int totalSectors = 0;
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@ -173,10 +96,10 @@ public class Nibblizer
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return false;
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}
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int o = addressField.track * TRACK_SIZE
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+ interleave[DOS][addressField.sector] * BLOCK_SIZE;
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int offset =
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addressField.track * TRACK_SIZE + interleave[addressField.sector] * BLOCK_SIZE;
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System.arraycopy (dataField.dataBuffer, 0, diskBuffer, o, BLOCK_SIZE);
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System.arraycopy (dataField.dataBuffer, 0, diskBuffer, offset, BLOCK_SIZE);
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if (++totalSectors == 16)
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break;
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@ -189,7 +112,6 @@ public class Nibblizer
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return false;
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}
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// System.out.printf ("Track: %02X - OK%n", trackNo);
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return true;
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}
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@ -292,14 +214,6 @@ public class Nibblizer
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return bits == 1 ? 2 : bits == 2 ? 1 : bits;
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}
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// private int skipBytes (byte[] buffer, int offset, byte skipValue)
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// {
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// int count = 0;
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// while (offset < buffer.length && buffer[offset++] == skipValue)
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// ++count;
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// return count;
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// }
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private String listBytes (byte[] buffer, int offset, int length)
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{
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StringBuilder text = new StringBuilder ();
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@ -336,7 +250,7 @@ public class Nibblizer
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return true;
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}
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abstract class Field
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private abstract class Field
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{
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protected boolean valid;
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protected byte[] buffer;
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@ -367,7 +281,7 @@ public class Nibblizer
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}
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}
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class AddressField extends Field
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private class AddressField extends Field
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{
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int track, sector, volume, checksum;
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@ -398,7 +312,7 @@ public class Nibblizer
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}
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}
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class DataField extends Field
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private class DataField extends Field
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{
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byte[] dataBuffer;
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@ -410,12 +324,6 @@ public class Nibblizer
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{
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valid = true;
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dataBuffer = decode6and2 (buffer, offset + 3);
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// if (!matchBytes (buffer, offset + 3 + BUFFER_WITH_CHECKSUM_SIZE, epilogue))
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// {
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// System.out.print (" bad data epilogue: ");
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// System.out
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// .println (listBytes (buffer, offset + 3 + BUFFER_WITH_CHECKSUM_SIZE, 3));
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// }
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}
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else
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{
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@ -52,7 +52,7 @@ public class V2dDisk
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{
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this.file = file;
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int tracks = 0;
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nibbler = new Nibblizer (file);
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nibbler = new Nibblizer ();
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try
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{
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@ -24,23 +24,11 @@ public class WozDisk
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// constructor
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// ---------------------------------------------------------------------------------//
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public WozDisk (File f)
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public WozDisk (File file)
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{
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this.file = f;
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Nibblizer nibbler = new Nibblizer (f);
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byte[] buffer = null;
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try
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{
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BufferedInputStream in = new BufferedInputStream (new FileInputStream (file));
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buffer = in.readAllBytes ();
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in.close ();
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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;
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}
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this.file = file;
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Nibblizer nibbler = new Nibblizer ();
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byte[] buffer = readFile ();
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assert matches (header, buffer);
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@ -136,18 +124,6 @@ public class WozDisk
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return value;
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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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// ---------------------------------------------------------------------------------//
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// readTrack
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// ---------------------------------------------------------------------------------//
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@ -179,4 +155,36 @@ public class WozDisk
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System.out.printf ("Value not used: %01X", value);
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// assert value == 0;
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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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// ---------------------------------------------------------------------------------//
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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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}
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