87 lines
1.9 KiB
C#
87 lines
1.9 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Text;
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using System.IO;
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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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static byte ReadByte( MemoryStream input )
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{
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int inp = input.ReadByte();
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if( inp == -1 )
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throw new InvalidDataException();
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return (byte)inp;
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}
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static int ReadWord( MemoryStream input )
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{
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int inp = ReadByte( input );
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return inp + ( ReadByte( input ) << 8 );
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}
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public static int DecodeInto( MemoryStream input, byte[] dest )
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{
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int destIndex = 0;
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while( true )
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{
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byte i = ReadByte( input );
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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 = ReadByte( input );
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byte value = ReadByte( input );
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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 ] ^= ReadByte( input );
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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 = ReadWord( input );
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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 ] ^= ReadByte( input );
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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 = ReadByte( input );
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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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