From af09d30b3bf6507f5ae10c80e45f9b39f141f654 Mon Sep 17 00:00:00 2001
From: Denis <93516910+Bussun@users.noreply.github.com>
Date: Fri, 28 Jan 2022 23:13:35 +0100
Subject: [PATCH] I'll work on Yaz0 more

---
 BMGEditor/FS/Yaz0Stream.cs | 67 ++------------------------------------
 1 file changed, 3 insertions(+), 64 deletions(-)

diff --git a/BMGEditor/FS/Yaz0Stream.cs b/BMGEditor/FS/Yaz0Stream.cs
index b7b8b17..b3d2872 100644
--- a/BMGEditor/FS/Yaz0Stream.cs
+++ b/BMGEditor/FS/Yaz0Stream.cs
@@ -25,76 +25,15 @@ namespace BMGEditor
         private Stream m_Backend;
     }
 
-    public static class Yaz0 // TODO: Finish rewriting this
+    public static class Yaz0 // TODO: Write it
     {
-        public static void Decompress(ref byte[] data)
+        unsafe public static void Decompress(ref byte[] data)
         {
             if (data[0] != 'Y' || data[1] != 'a' || data[2] != 'z' || data[3] != '0')
                 return;
 
             Int32 decompSize = (data[4] << 24 | data[5] << 16 | data[6] << 8 | data[7]);
-            uint sourcePos = 16; //start at 0x10
-            uint writePos = 0; //destination to write data to
-            byte[] decodedData = new byte[decompSize + 1];
-            byte groupHead = 0;
-            byte lastGroupHead = 0;
-            uint validBitCount = 0;
-
-            while (writePos < decompSize)
-            {
-                //System.Windows.Forms.MessageBox.Show(groupHead.ToString("X") + "|" + validBitCount);
-                if (validBitCount == 0) //new group header 
-                {
-                    groupHead = data[sourcePos];
-                    lastGroupHead = groupHead;
-                    ++sourcePos;
-                    validBitCount = 8; //reset count
-                }
-                if ((groupHead & 0x80) != 0) //straight copy as long as groupheader maintains left most bit as 1 (1000 0000)
-                {
-                    decodedData[writePos] = data[sourcePos];
-                    writePos++;
-                    sourcePos++;
-                }
-                else
-                {
-                    byte b1 = data[sourcePos]; //byte 1 
-                    byte b2 = data[sourcePos + 1]; //byte 2
-                    sourcePos += 2; //move past those two bytes
-                    uint dist = (uint)((b1 & 0xF) << 8) | b2; //distance
-                    if (Tests.isBE)
-                        dist = (UInt32)((dist >> 24) | ((dist & 0xFF0000) >> 8) | ((dist & 0xFF00) << 8) | (dist << 24));
-
-                    uint copySource = writePos - (dist + 1); //copy 
-                    uint numBytes = (uint)b1 >> 4; //how many bytes to copy
-
-                    //if (sourcePos-2 > 0x13C0) //debug decode
-                    //System.Windows.Forms.MessageBox.Show("lastGroupHead: 0x" + lastGroupHead.ToString("X") + "\n" + "b1: 0x" + b1.ToString("X") + "\n" + "b2: 0x" + b2.ToString("X") + "\n" + "sourcePos: 0x" + sourcePos.ToString("X") + "\n" + "dist: " + dist + "\n" + "copySource: 0x" + copySource.ToString("X") + "\n" + "writePos: 0x" + writePos.ToString("X") + "\n" + "numBytes: " + numBytes);
-
-                    if (numBytes == 0) //If the first 4 bits of the first byte is 0...
-                    {
-                        numBytes = data[sourcePos] + (uint)0x12;
-                        sourcePos++;
-                    }
-                    else
-                    {
-                        numBytes += 2;
-                    }
-                    for (int i = 0; i < numBytes; ++i)
-                    {
-                        decodedData[writePos] = decodedData[copySource];
-                        copySource++;
-                        writePos++;
-                    }
-                }
-                groupHead <<= 1; //left shift!!!
-                validBitCount -= 1; //group header validation count of the binary position
-            }
-
-            Array.Resize(ref data, decompSize + 1);
-            decodedData.CopyTo(data, 0);
-            FileStream test = File.OpenWrite("./test.bin");
-            test.Write(data);
+            
             return;
         }
     }