[Opentnl-cvs] tnl/tnl byteBuffer.cpp,1.1,1.2 tnlBitStream.h,1.1,1.2 tnlByteBuffer.h,1.1,1.2

[Mark F. <mar...@us...>]

Update of /cvsroot/opentnl/tnl/tnl
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv23137/tnl

Modified Files:
	byteBuffer.cpp tnlBitStream.h tnlByteBuffer.h 
Log Message:
Reduced bandwidth usage of ship updates
Does not send server state of control object if it is unchanged on client
Added CRC capability to ByteBuffer class

Index: byteBuffer.cpp
===================================================================
RCS file: /cvsroot/opentnl/tnl/tnl/byteBuffer.cpp,v
retrieving revision 1.1
retrieving revision 1.2
diff -C2 -d -r1.1 -r1.2
*** byteBuffer.cpp	20 Apr 2004 04:27:18 -0000	1.1
--- byteBuffer.cpp	22 Apr 2004 20:42:25 -0000	1.2
***************
*** 49,52 ****
--- 49,87 ----
  }
  
+ U32 ByteBuffer::calculateCRC(U32 start, U32 end, U32 crcVal) const
+ {
+    static U32 crcTable[256];
+    static bool crcTableValid = false;
+ 
+    if(!crcTableValid)
+    {
+       U32 val;
+ 
+       for(S32 i = 0; i < 256; i++)
+       {
+          val = i;
+          for(S32 j = 0; j < 8; j++)
+          {
+             if(val & 0x01)
+                val = 0xedb88320 ^ (val >> 1);
+             else
+                val = val >> 1;
+          }
+          crcTable[i] = val;
+       }
+       crcTableValid = true;
+    }
+    
+    if(start >= mBufSize)
+       return 0;
+    if(end > mBufSize)
+       end = mBufSize;
+ 
+    // now calculate the crc
+    const U8 * buf = getBuffer();
+    for(U32 i = start; i < end; i++)
+       crcVal = crcTable[(crcVal ^ buf[i]) & 0xff] ^ (crcVal >> 8);
+    return(crcVal);
+ }
  
  };

Index: tnlBitStream.h
===================================================================
RCS file: /cvsroot/opentnl/tnl/tnl/tnlBitStream.h,v
retrieving revision 1.1
retrieving revision 1.2
diff -C2 -d -r1.1 -r1.2
*** tnlBitStream.h	20 Apr 2004 04:27:18 -0000	1.1
--- tnlBitStream.h	22 Apr 2004 20:42:25 -0000	1.2
***************
*** 114,117 ****
--- 114,120 ----
     void advanceBitPosition(const S32 numBits);
  
+    /// Pads the bits up to the next byte boundary with 0's.
+    void zeroToByteBoundary();
+ 
     /// Writes an unsigned integer value between 0 and 2^(bitCount - 1) into the stream.
     void writeInt(U32 value, U8 bitCount);
***************
*** 291,294 ****
--- 294,303 ----
  }
  
+ inline void BitStream::zeroToByteBoundary()
+ {
+    if(bitNum & 0x7)
+       writeInt(0, 8 - (bitNum & 0x7));
+ }
+ 
  inline bool BitStream::write(const U32 in_numBytes, const void* in_pBuffer)
  {

Index: tnlByteBuffer.h
===================================================================
RCS file: /cvsroot/opentnl/tnl/tnl/tnlByteBuffer.h,v
retrieving revision 1.1
retrieving revision 1.2
diff -C2 -d -r1.1 -r1.2
*** tnlByteBuffer.h	20 Apr 2004 04:27:18 -0000	1.1
--- tnlByteBuffer.h	22 Apr 2004 20:42:25 -0000	1.2
***************
*** 170,173 ****
--- 170,176 ----
     /// Decode the buffer from base 64, in place. Resizes the buffer.
     RefPtr<ByteBuffer> decodeBase64() const;
+ 
+    /// Returns a 32 bit CRC for the buffer.
+    U32 calculateCRC(U32 start = 0, U32 end = 0xFFFFFFFF, U32 crcVal = 0xFFFFFFFF) const;
  };