epic/OpenRA
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

MOAR PERF

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

60
OpenRa.FileFormats/Format80.cs
View File

@@ -5,23 +5,33 @@ using System.IO;
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 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 );
}
static void ReplicatePrevious( byte[] dest, int destIndex, int srcIndex, int count )
{
if( srcIndex >= destIndex )
@@ -39,16 +49,18 @@ namespace OpenRa.FileFormats
}
}
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 )
{
// case 2
byte secondByte = ReadByte( input );
byte secondByte = ctx.ReadByte();
int count = ( ( i & 0x70 ) >> 4 ) + 3;
int rpos = ( ( i & 0xf ) << 8 ) + secondByte;
@@ -62,7 +74,7 @@ namespace OpenRa.FileFormats
if( count == 0 )
return destIndex;
input.Read( dest, destIndex, count );
ctx.CopyTo( dest, destIndex, count );
destIndex += count;
}
else
@@ -71,8 +83,8 @@ namespace OpenRa.FileFormats
if( count3 == 0x3E )
{
// case 4
int count = ReadWord( input );
byte color = ReadByte( input );
int count = ctx.ReadWord();
byte color = ctx.ReadByte();
for( int end = destIndex + count ; destIndex < end ; destIndex++ )
dest[ destIndex ] = color;
@@ -80,8 +92,8 @@ namespace OpenRa.FileFormats
else if( count3 == 0x3F )
{
// case 5
int count = ReadWord( input );
int srcIndex = ReadWord( input );
int count = ctx.ReadWord();
int srcIndex = ctx.ReadWord();
if( srcIndex >= destIndex )
throw new NotImplementedException( string.Format( "srcIndex >= destIndex {0} {1}", srcIndex, destIndex ) );
@@ -92,7 +104,7 @@ namespace OpenRa.FileFormats
{
// case 3
int count = count3 + 3;
int srcIndex = ReadWord( input );
int srcIndex = ctx.ReadWord();
if( srcIndex >= destIndex )
throw new NotImplementedException( string.Format( "srcIndex >= destIndex {0} {1}", srcIndex, destIndex ) );