mem_align.c revision b676a05348e4c516fa8b57e33b10548e6142c3f8 
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:		mem_align.c
19
20	Content:	Memory alloc alignments functions
21
22*******************************************************************************/
23
24
25#include	"mem_align.h"
26
27/*****************************************************************************
28*
29* function name: mem_malloc
30* description:  malloc the alignments memory
31* returns:      the point of the memory
32*
33**********************************************************************************/
34void *
35mem_malloc(VO_MEM_OPERATOR *pMemop, unsigned int size, unsigned char alignment, unsigned int CodecID)
36{
37	int ret;
38	unsigned char *mem_ptr;
39	VO_MEM_INFO MemInfo;
40
41	if (!alignment) {
42
43		MemInfo.Flag = 0;
44		MemInfo.Size = size + 1;
45		ret = pMemop->Alloc(CodecID, &MemInfo);
46		if(ret != 0)
47			return 0;
48		mem_ptr = (unsigned char *)MemInfo.VBuffer;
49
50		pMemop->Set(CodecID, mem_ptr, 0, size + 1);
51
52		*mem_ptr = (unsigned char)1;
53
54		return ((void *)(mem_ptr+1));
55	} else {
56		unsigned char *tmp;
57
58		MemInfo.Flag = 0;
59		MemInfo.Size = size + alignment;
60		ret = pMemop->Alloc(CodecID, &MemInfo);
61		if(ret != 0)
62			return 0;
63
64		tmp = (unsigned char *)MemInfo.VBuffer;
65
66		pMemop->Set(CodecID, tmp, 0, size + alignment);
67
68		mem_ptr =
69			(unsigned char *) ((unsigned int) (tmp + alignment - 1) &
70					(~((unsigned int) (alignment - 1))));
71
72		if (mem_ptr == tmp)
73			mem_ptr += alignment;
74
75		*(mem_ptr - 1) = (unsigned char) (mem_ptr - tmp);
76
77		return ((void *)mem_ptr);
78	}
79
80	return(0);
81}
82
83
84/*****************************************************************************
85*
86* function name: mem_free
87* description:  free the memory
88*
89*******************************************************************************/
90void
91mem_free(VO_MEM_OPERATOR *pMemop, void *mem_ptr, unsigned int CodecID)
92{
93
94	unsigned char *ptr;
95
96	if (mem_ptr == 0)
97		return;
98
99	ptr = mem_ptr;
100
101	ptr -= *(ptr - 1);
102
103	pMemop->Free(CodecID, ptr);
104}
105
106
107
108