89 lines
2.5 KiB
C#
89 lines
2.5 KiB
C#
#region Copyright & License Information
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/*
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* Copyright 2007,2009,2010 Chris Forbes, Robert Pepperell, Matthew Bowra-Dean, Paul Chote, Alli Witheford.
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* This file is part of OpenRA.
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*
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* OpenRA is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* OpenRA is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with OpenRA. If not, see <http://www.gnu.org/licenses/>.
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*/
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#endregion
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namespace OpenRA.FileFormats
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{
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public static class Format40
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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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int count = i & 0x7F;
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if( count == 0 )
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{
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// case 6
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count = ctx.ReadByte();
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byte value = ctx.ReadByte();
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for( int end = destIndex + count ; destIndex < end ; destIndex++ )
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dest[ destIndex ] ^= value;
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}
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else
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{
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// case 5
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for( int end = destIndex + count ; destIndex < end ; destIndex++ )
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dest[destIndex] ^= ctx.ReadByte();
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}
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}
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else
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{
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int count = i & 0x7F;
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if( count == 0 )
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{
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count = ctx.ReadWord();
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if( count == 0 )
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return destIndex;
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if( ( count & 0x8000 ) == 0 )
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{
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// case 2
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destIndex += ( count & 0x7FFF );
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}
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else if( ( count & 0x4000 ) == 0 )
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{
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// case 3
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for( int end = destIndex + ( count & 0x3FFF ) ; destIndex < end ; destIndex++ )
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dest[destIndex] ^= ctx.ReadByte();
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}
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else
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{
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// case 4
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byte value = ctx.ReadByte();
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for( int end = destIndex + ( count & 0x3FFF ) ; destIndex < end ; destIndex++ )
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dest[ destIndex ] ^= value;
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}
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}
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else
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{
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// case 1
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destIndex += count;
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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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