1 files changed, 70 insertions, 0 deletions
diff --git a/plugins/sid/sidplay-libs/libsidplay/src/sidtune/PP20.h b/plugins/sid/sidplay-libs/libsidplay/src/sidtune/PP20.h
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index 00000000..74e7f5f7
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+++ b/plugins/sid/sidplay-libs/libsidplay/src/sidtune/PP20.h
@@ -0,0 +1,70 @@
+/*
+ * /home/ms/files/source/libsidtune/RCS/PP20.h,v
+ *
+ * PowerPacker (AMIGA) "PP20" format decompressor.
+ * Copyright (C) Michael Schwendt <mschwendt@yahoo.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef PP_DECOMPRESSOR_H
+#define PP_DECOMPRESSOR_H
+
+#include "PP20_Defs.h"
+
+class PP20
+{
+ public:
+    
+    PP20();
+
+    bool isCompressed(const void* source, const udword_ppt size);
+    
+    // If successful, allocates a new buffer containing the
+    // uncompresse data and returns the uncompressed length.
+    // Else, returns 0.
+    udword_ppt decompress(const void* source, 
+                                udword_ppt size,
+                                ubyte_ppt** destRef);
+    
+    const char* getStatusString()  { return statusString; }
+    
+ private:
+    bool checkEfficiency(const void* source);
+    
+    void bytesTOdword();
+    udword_ppt readBits(int count);
+    void bytes();
+    void sequence();
+
+    static const char* PP_ID;
+
+    ubyte_ppt efficiency[4];
+    
+    const ubyte_ppt* sourceBeg;
+    const ubyte_ppt* readPtr;
+    
+    const ubyte_ppt* destBeg;
+    ubyte_ppt* writePtr;
+    
+    udword_ppt current;            // compressed data longword
+    int bits;                   // number of bits in 'current' to evaluate
+    
+    bool globalError;           // exception-free version of code
+
+    const char* statusString;
+};
+
+#endif  /* PP_DECOMPRESSOR_H */