Apple-2-Tools/dmolony-DiskBrowser
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added walk()

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This commit is contained in:
Denis Molony 2016-08-17 12:20:00 +10:00
parent 0b033429b4
commit 816548386e
2 changed files with 43 additions and 7 deletions
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44
src/com/bytezone/diskbrowser/wizardry/Huffman.java
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@ -1,8 +1,10 @@
package com.bytezone.diskbrowser.wizardry; package com.bytezone.diskbrowser.wizardry;
import com.bytezone.diskbrowser.applefile.AbstractFile;
// Based on a pascal routine by Tom Ewers // Based on a pascal routine by Tom Ewers
public class Huffman public class Huffman extends AbstractFile
{ {
private final byte[] tree; private final byte[] tree;
private final byte[] left; private final byte[] left;
@ -13,8 +15,12 @@ public class Huffman
private int currentByte; private int currentByte;
private byte[] message; private byte[] message;
public Huffman (byte[] buffer) private String treeContents;
public Huffman (String name, byte[] buffer)
{ {
super (name, buffer);
tree = new byte[256]; tree = new byte[256];
left = new byte[256]; left = new byte[256];
right = new byte[256]; right = new byte[256];
@ -47,7 +53,7 @@ public class Huffman
{ {
if (bitNo-- == 0) if (bitNo-- == 0)
{ {
bitNo = 7; bitNo += 8;
currentByte = message[msgPtr++] & 0xFF; currentByte = message[msgPtr++] & 0xFF;
} }
@ -68,4 +74,36 @@ public class Huffman
} }
} }
} }
@Override
public String getText ()
{
if (treeContents == null)
{
StringBuilder text = new StringBuilder ();
walk (0, "", text);
treeContents = text.toString ();
}
return treeContents;
}
private void walk (int treePtr, String path, StringBuilder text)
{
if ((tree[treePtr] & 0x01) == 0)
walk (left[treePtr] & 0xFF, path + "1", text);
else
print (path + "1", left[treePtr], text);
if ((tree[treePtr] & 0x02) == 0)
walk (right[treePtr] & 0xFF, path + "0", text);
else
print (path + "0", right[treePtr], text);
}
private void print (String path, byte value, StringBuilder text)
{
int val = value & 0xFF;
char c = val < 32 || val >= 127 ? ' ' : (char) val;
text.append (String.format ("%3d %1.1s %s%n", val, c, path));
}
} }

6
src/com/bytezone/diskbrowser/wizardry/Wizardry4BootDisk.java
View File

@ -94,11 +94,9 @@ public class Wizardry4BootDisk extends PascalDisk
byte[] buffer = fileEntry.getDataSource ().buffer; byte[] buffer = fileEntry.getDataSource ().buffer;
Huffman huffman = new Huffman (buffer); Huffman huffman = new Huffman ("Huffman tree", buffer);
messageBlock.setHuffman (huffman); messageBlock.setHuffman (huffman);
fileEntry.setFile (huffman);
// for (int msg = 2043; msg <= 2045; msg++)
// System.out.println (huffman.getMessage (messageBlock.getMessage (msg)));
} }
} }