text: /*
     FreeRDP: A Remote Desktop Protocol client.
     RemoteFX Codec Library - Differential Encoding
  
     Copyright 2011 Vic Lee
  
     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at
  
         http://www.apache.org/licenses/LICENSE-2.0
  
     Unless required by applicable law or agreed to in writing, software
     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License.
  */
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include "rfx_differential.h"
  
  void
  rfx_differential_decode(sint16 * buffer, int buffer_size)
  {
  	sint16 * src;
  	sint16 * dst;
  
  	for (src = buffer, dst = buffer + 1; buffer_size > 1; src++, dst++, buffer_size--)
  	{
  		*dst += *src;
  	}
  }
  
  void
  rfx_differential_encode(sint16 * buffer, int buffer_size)
  {
  	sint16 n1, n2;
  	sint16 * dst;
  
  	for (n1 = *buffer, dst = buffer + 1; buffer_size > 1; dst++, buffer_size--)
  	{
  		n2 = *dst;
  		*dst -= n1;
  		n1 = n2;
  	}
  }
  
  