126 lines
3.4 KiB
C#
126 lines
3.4 KiB
C#
#region Copyright & License Information
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/*
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* Copyright 2007-2010 The OpenRA Developers (see AUTHORS)
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* This file is part of OpenRA, which is free software. It is made
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* available to you under the terms of the GNU General Public License
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* as published by the Free Software Foundation. For more information,
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* see LICENSE.
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*/
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#endregion
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using System;
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namespace OpenRA.FileFormats
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{
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class FastByteReader
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{
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readonly byte[] src;
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int offset = 0;
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public FastByteReader(byte[] src)
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{
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this.src = src;
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}
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public bool Done() { return offset >= src.Length; }
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public byte ReadByte() { return src[offset++]; }
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public int ReadWord()
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{
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int x = ReadByte();
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return x | (ReadByte() << 8);
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}
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public void CopyTo(byte[] dest, int offset, int count)
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{
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Array.Copy(src, this.offset, dest, offset, count);
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this.offset += count;
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}
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}
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public static class Format80
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{
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static void ReplicatePrevious( byte[] dest, int destIndex, int srcIndex, int count )
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{
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if( srcIndex > destIndex )
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throw new NotImplementedException( string.Format( "srcIndex > destIndex {0} {1}", srcIndex, destIndex ) );
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if( destIndex - srcIndex == 1 )
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{
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for( int i = 0 ; i < count ; i++ )
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dest[ destIndex + i ] = dest[ destIndex - 1 ];
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}
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else
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{
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for( int i = 0 ; i < count ; i++ )
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dest[ destIndex + i ] = dest[ srcIndex + i ];
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}
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}
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public static int DecodeInto( byte[] src, byte[] dest )
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{
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var ctx = new FastByteReader(src);
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int destIndex = 0;
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while( true )
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{
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byte i = ctx.ReadByte();
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if( ( i & 0x80 ) == 0 )
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{
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// case 2
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byte secondByte = ctx.ReadByte();
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int count = ( ( i & 0x70 ) >> 4 ) + 3;
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int rpos = ( ( i & 0xf ) << 8 ) + secondByte;
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ReplicatePrevious( dest, destIndex, destIndex - rpos, count );
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destIndex += count;
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}
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else if( ( i & 0x40 ) == 0 )
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{
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// case 1
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int count = i & 0x3F;
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if( count == 0 )
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return destIndex;
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ctx.CopyTo( dest, destIndex, count );
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destIndex += count;
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}
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else
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{
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int count3 = i & 0x3F;
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if( count3 == 0x3E )
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{
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// case 4
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int count = ctx.ReadWord();
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byte color = ctx.ReadByte();
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for( int end = destIndex + count ; destIndex < end ; destIndex++ )
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dest[ destIndex ] = color;
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}
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else if( count3 == 0x3F )
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{
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// case 5
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int count = ctx.ReadWord();
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int srcIndex = ctx.ReadWord();
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if( srcIndex >= destIndex )
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throw new NotImplementedException( string.Format( "srcIndex >= destIndex {0} {1}", srcIndex, destIndex ) );
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for( int end = destIndex + count ; destIndex < end ; destIndex++ )
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dest[ destIndex ] = dest[ srcIndex++ ];
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}
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else
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{
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// case 3
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int count = count3 + 3;
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int srcIndex = ctx.ReadWord();
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if( srcIndex >= destIndex )
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throw new NotImplementedException( string.Format( "srcIndex >= destIndex {0} {1}", srcIndex, destIndex ) );
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for( int end = destIndex + count ; destIndex < end ; destIndex++ )
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dest[ destIndex ] = dest[ srcIndex++ ];
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}
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}
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}
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}
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}
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}
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