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better exomizer detection

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This commit is contained in:
Denis Molony 2020-06-25 07:28:16 +10:00
parent a06ac3e5ee
commit 9576c6270c
2 changed files with 43 additions and 20 deletions
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61
src/com/bytezone/diskbrowser/applefile/ExoBuffer.java
View File

@ -16,7 +16,7 @@ public class ExoBuffer
private static final int PFLAG_4_OFFSET_TABLES = 16;
private byte[] inBuffer;
private byte[] outBuffer = new byte[0x8000];
private byte[] outBuffer;
private int inPos;
private int outPos;
@ -35,16 +35,30 @@ public class ExoBuffer
// ---------------------------------------------------------------------------------//
{
this.inBuffer = inBuffer;
switch (inBuffer[inBuffer.length - 1])
{
case 0x60:
outBuffer = new byte[0x2000];
break;
case (byte) 0x80:
outBuffer = new byte[0x4000];
break;
case (byte) 0xA0:
outBuffer = new byte[0x8000];
break;
}
Utility.reverse (inBuffer);
int newSize = decrunch ();
decrunch ();
if (newSize < outBuffer.length)
{
byte[] outBuffer2 = new byte[newSize];
System.arraycopy (outBuffer, 0, outBuffer2, 0, newSize);
outBuffer = outBuffer2;
}
// if (newSize < outBuffer.length)
// {
// byte[] outBuffer2 = new byte[newSize];
// System.arraycopy (outBuffer, 0, outBuffer2, 0, newSize);
// outBuffer = outBuffer2;
// }
Utility.reverse (outBuffer);
}
@ -60,17 +74,26 @@ public class ExoBuffer
public static boolean isExomizer (byte[] buffer, int auxType)
// ---------------------------------------------------------------------------------//
{
int last = buffer.length - 1;
if ((auxType == 0x1FF8 || auxType == 0x3FF8) //
&& buffer[0] == 1 && buffer[1] == 0 //
&& buffer[last - 1] == 0) // this sucks
return true;
// 00 60 HGR
// 00 80 DHGR
// 00 A0 SHR
return false;
if (auxType != 0x1FF8 && auxType != 0x3FF8)
return false;
int last = buffer.length - 1;
if (buffer[0] != 1 || buffer[1] != 0 || buffer[last - 1] != 0)
return false;
if (buffer[last] != 0x60 && buffer[last] != (byte) 0x80
&& buffer[last] != (byte) 0xA0)
return false;
return true;
}
// ---------------------------------------------------------------------------------//
private int bitBufRotate (int carry)
private int bitBufRotate (int carryIn)
// ---------------------------------------------------------------------------------//
{
int carryOut;
@ -80,7 +103,7 @@ public class ExoBuffer
carryOut = (bitBuffer & 0x80) >>> 7;
bitBuffer = (bitBuffer << 1) & 0xFF;
if (carry != 0)
if (carryIn != 0)
bitBuffer |= 0x01;
}
else
@ -88,7 +111,7 @@ public class ExoBuffer
carryOut = bitBuffer & 0x01;
bitBuffer = (bitBuffer >>> 1) & 0xFF;
if (carry != 0)
if (carryIn != 0)
bitBuffer |= 0x80;
}
@ -213,7 +236,7 @@ public class ExoBuffer
}
// ---------------------------------------------------------------------------------//
private int decrunch ()
private void decrunch ()
// ---------------------------------------------------------------------------------//
{
inPos = 2;
@ -269,7 +292,7 @@ public class ExoBuffer
}
srcPtr = copy (len, literal, srcPtr);
}
return outPos;
assert outPos == outBuffer.length;
}
// ---------------------------------------------------------------------------------//

2
src/com/bytezone/diskbrowser/prodos/FileEntry.java
View File

@ -327,7 +327,7 @@ class FileEntry extends CatalogEntry implements ProdosConstants
switch (outBuffer.length)
{
case 0x2000:
file = new OriginalHiResImage (name, outBuffer, 0x3FF8);
file = new OriginalHiResImage (name, outBuffer, 0x4000);
break;
case 0x4000:
file = new DoubleHiResImage (name, outBuffer);