util.c revision 5d5c3a132bb446ac78a37dfaac24a46cacf0dd73 
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    while (num > 0) {
39        *x++ = 0;
40                --num;
41    }
42}
43
44
45/*********************************************************************
46* Function: Copy()                                                   *
47*                                                                    *
48* Description: Copy vector x[] to y[]                                *
49*********************************************************************/
50
51void Copy(
52        Word16 x[],                           /* (i)   : input vector   */
53        Word16 y[],                           /* (o)   : output vector  */
54        Word16 L                              /* (i)   : vector length  */
55     )
56{
57    Word32  temp1,temp2,num;
58        if (L <= 0) {
59                return;
60        }
61    if(L&1)
62    {
63        temp1 = *x++;
64        *y++ = temp1;
65    }
66    num = (Word32)(L>>1);
67    while (num > 0) {
68        temp1 = *x++;
69        temp2 = *x++;
70        *y++ = temp1;
71        *y++ = temp2;
72                --num;
73    }
74}
75
76
77
78