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MOAR PERF

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git-svn-id: svn://svn.ijw.co.nz/svn/OpenRa@1956 993157c7-ee19-0410-b2c4-bb4e9862e678
This commit is contained in:
chrisf
2008-03-25 02:07:15 +00:00
parent f218d212ff
commit b77a116f60
7 changed files with 98 additions and 123 deletions
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33
OpenRa.FileFormats/Format40.cs
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@@ -7,35 +7,22 @@ namespace OpenRa.FileFormats
{
public static class Format40
{
static byte ReadByte( MemoryStream input )
{
int inp = input.ReadByte();
if( inp == -1 )
throw new InvalidDataException();
return (byte)inp;
}
static int ReadWord( MemoryStream input )
{
int inp = ReadByte( input );
return inp + ( ReadByte( input ) << 8 );
}
public static int DecodeInto( MemoryStream input, byte[] dest )
public static int DecodeInto( byte[] src, byte[] dest )
{
var ctx = new FastByteReader(src);
int destIndex = 0;
while( true )
{
byte i = ReadByte( input );
byte i = ctx.ReadByte();
if( ( i & 0x80 ) == 0 )
{
int count = i & 0x7F;
if( count == 0 )
{
// case 6
count = ReadByte( input );
byte value = ReadByte( input );
count = ctx.ReadByte();
byte value = ctx.ReadByte();
for( int end = destIndex + count ; destIndex < end ; destIndex++ )
dest[ destIndex ] ^= value;
}
@@ -43,7 +30,7 @@ namespace OpenRa.FileFormats
{
// case 5
for( int end = destIndex + count ; destIndex < end ; destIndex++ )
dest[ destIndex ] ^= ReadByte( input );
dest[destIndex] ^= ctx.ReadByte();
}
}
else
@@ -51,7 +38,7 @@ namespace OpenRa.FileFormats
int count = i & 0x7F;
if( count == 0 )
{
count = ReadWord( input );
count = ctx.ReadWord();
if( count == 0 )
return destIndex;
@@ -64,12 +51,12 @@ namespace OpenRa.FileFormats
{
// case 3
for( int end = destIndex + ( count & 0x3FFF ) ; destIndex < end ; destIndex++ )
dest[ destIndex ] ^= ReadByte( input );
dest[destIndex] ^= ctx.ReadByte();
}
else
{
// case 4
byte value = ReadByte( input );
byte value = ctx.ReadByte();
for( int end = destIndex + ( count & 0x3FFF ) ; destIndex < end ; destIndex++ )
dest[ destIndex ] ^= value;
}