1 /*
2 * Copyright (C) 2011 The Android Open Source Project
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 #ifndef _FIXED_BUFFER_H
17 #define _FIXED_BUFFER_H
18 
19 #include <cutils/log.h>
20 
21 class FixedBuffer {
22 public:
23     FixedBuffer(size_t initialSize = 0) {
24         m_buffer = NULL;
25         m_bufferLen = initialSize;
26         alloc(m_bufferLen);
27     }
28 
~FixedBuffer()29     ~FixedBuffer() {
30         delete [] m_buffer;
31         m_bufferLen = 0;
32     }
33 
alloc(size_t size)34     void * alloc(size_t size) {
35         if (m_bufferLen >= size)
36             return (void *)(m_buffer);
37 
38         if (m_buffer != NULL)
39             delete[] m_buffer;
40 
41         m_bufferLen = size;
42         m_buffer = new unsigned char[m_bufferLen];
43         if (m_buffer == NULL)
44             m_bufferLen = 0;
45 
46         return m_buffer;
47     }
ptr()48     void *ptr() { return m_buffer; }
len()49     size_t len() { return m_bufferLen; }
50 private:
51     unsigned char *m_buffer;
52     size_t m_bufferLen;
53 };
54 
55 #endif
56