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/*
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;
}
}
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