Reorganise FileFormats

2010-04-01 14:25:08 +13:00
parent 5a95c8a071
commit 8a64209d89
27 changed files with 124 additions and 28 deletions
--- a/OpenRA.FileFormats/FileFormats/Format80.cs
+++ b/OpenRA.FileFormats/FileFormats/Format80.cs
@@ -0,0 +1,135 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007,2009,2010 Chris Forbes, Robert Pepperell, Matthew Bowra-Dean, Paul Chote, Alli Witheford.
+ * This file is part of OpenRA.
+ * 
+ *  OpenRA 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 3 of the License, or
+ *  (at your option) any later version.
+ * 
+ *  OpenRA 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 OpenRA.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#endregion
+
+using System;
+
+namespace OpenRA.FileFormats
+{
+    class FastByteReader
+    {
+        readonly byte[] src;
+        int offset = 0;
+
+        public FastByteReader(byte[] src)
+        {
+            this.src = src;
+        }
+
+        public bool Done() { return offset >= src.Length; }
+        public byte ReadByte() { return src[offset++]; }
+        public int ReadWord()
+        {
+            int x = ReadByte();
+            return x | (ReadByte() << 8);
+        }
+
+        public void CopyTo(byte[] dest, int offset, int count)
+        {
+            Array.Copy(src, this.offset, dest, offset, count);
+            this.offset += count;
+        }
+    }
+
+	public static class Format80
+	{
+		static void ReplicatePrevious( byte[] dest, int destIndex, int srcIndex, int count )
+		{
+			if( srcIndex > destIndex )
+				throw new NotImplementedException( string.Format( "srcIndex > destIndex  {0}  {1}", srcIndex, destIndex ) );
+
+			if( destIndex - srcIndex == 1 )
+			{
+				for( int i = 0 ; i < count ; i++ )
+					dest[ destIndex + i ] = dest[ destIndex - 1 ];
+			}
+			else
+			{
+				for( int i = 0 ; i < count ; i++ )
+					dest[ destIndex + i ] = dest[ srcIndex + i ];
+			}
+		}
+
+		public static int DecodeInto( byte[] src, byte[] dest )
+		{
+            var ctx = new FastByteReader(src);
+			int destIndex = 0;
+
+			while( true )
+			{
+                byte i = ctx.ReadByte();
+				if( ( i & 0x80 ) == 0 )
+				{
+					// case 2
+                    byte secondByte = ctx.ReadByte();
+					int count = ( ( i & 0x70 ) >> 4 ) + 3;
+					int rpos = ( ( i & 0xf ) << 8 ) + secondByte;
+
+					ReplicatePrevious( dest, destIndex, destIndex - rpos, count );
+					destIndex += count;
+				}
+				else if( ( i & 0x40 ) == 0 )
+				{
+					// case 1
+					int count = i & 0x3F;
+					if( count == 0 )
+						return destIndex;
+
+					ctx.CopyTo( dest, destIndex, count );
+					destIndex += count;
+				}
+				else
+				{
+					int count3 = i & 0x3F;
+					if( count3 == 0x3E )
+					{
+						// case 4
+                        int count = ctx.ReadWord();
+                        byte color = ctx.ReadByte();
+
+						for( int end = destIndex + count ; destIndex < end ; destIndex++ )
+							dest[ destIndex ] = color;
+					}
+					else if( count3 == 0x3F )
+					{
+						// case 5
+                        int count = ctx.ReadWord();
+                        int srcIndex = ctx.ReadWord();
+						if( srcIndex >= destIndex )
+							throw new NotImplementedException( string.Format( "srcIndex >= destIndex  {0}  {1}", srcIndex, destIndex ) );
+
+						for( int end = destIndex + count ; destIndex < end ; destIndex++ )
+							dest[ destIndex ] = dest[ srcIndex++ ];
+					}
+					else
+					{
+						// case 3
+						int count = count3 + 3;
+                        int srcIndex = ctx.ReadWord();
+						if( srcIndex >= destIndex )
+							throw new NotImplementedException( string.Format( "srcIndex >= destIndex  {0}  {1}", srcIndex, destIndex ) );
+
+						for( int end = destIndex + count ; destIndex < end ; destIndex++ )
+							dest[ destIndex ] = dest[ srcIndex++ ];
+					}
+				}
+			}
+		}
+	}
+}