util.c revision 956c553ab0ce72f8074ad0fda2ffd66a0305700c 
1/*
2 ** Copyright 2003-2010, VisualOn, Inc.
3 **
4 ** Licensed under the Apache License, Version 2.0 (the "License");
5 ** you may not use this file except in compliance with the License.
6 ** You may obtain a copy of the License at
7 **
8 **     http://www.apache.org/licenses/LICENSE-2.0
9 **
10 ** Unless required by applicable law or agreed to in writing, software
11 ** distributed under the License is distributed on an "AS IS" BASIS,
12 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 ** See the License for the specific language governing permissions and
14 ** limitations under the License.
15 */
16
17/***********************************************************************
18*       File: util.c                                                   *
19*                                                                      *
20*       Description: Reset and Copy buffer                             *
21*                                                                      *
22************************************************************************/
23
24#include "typedef.h"
25#include "basic_op.h"
26
27/***********************************************************************
28* Function:  Set_zero()                                             *
29* Description: Set vector x[] to zero                               *
30************************************************************************/
31
32void Set_zero(
33		Word16 x[],                           /* (o)    : vector to clear     */
34		Word16 L                              /* (i)    : length of vector    */
35	     )
36{
37	Word32 num = (Word32)L;
38	do{
39		*x++ = 0;
40	}while(--num !=0);
41}
42
43
44/*********************************************************************
45* Function: Copy()                                                   *
46*                                                                    *
47* Description: Copy vector x[] to y[]                                *
48*********************************************************************/
49
50void Copy(
51		Word16 x[],                           /* (i)   : input vector   */
52		Word16 y[],                           /* (o)   : output vector  */
53		Word16 L                              /* (i)   : vector length  */
54	 )
55{
56	Word32	temp1,temp2,num;
57	if(L&1)
58	{
59		temp1 = *x++;
60		*y++ = temp1;
61	}
62	num = (Word32)(L>>1);
63	temp1 = *x++;
64	temp2 = *x++;
65	do{
66		*y++ = temp1;
67		*y++ = temp2;
68		temp1 = *x++;
69		temp2 = *x++;
70	}while(--num!=0);
71}
72
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75