FixedBuffer.h revision b85b2756d1e247f8314bb591700fb175d7346631 
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
19class FixedBuffer {
20public:
21    FixedBuffer(size_t initialSize = 0) {
22        m_buffer = NULL;
23        m_bufferLen = 0;
24        alloc(m_bufferLen);
25    }
26
27    ~FixedBuffer() {
28        delete [] m_buffer;
29        m_bufferLen = 0;
30    }
31
32    void * alloc(size_t size) {
33        if (m_bufferLen >= size)
34            return (void *)(m_buffer);
35
36        if (m_buffer != NULL)
37            delete[] m_buffer;
38
39        m_bufferLen = size;
40        m_buffer = new unsigned char[m_bufferLen];
41        if (m_buffer == NULL)
42            m_bufferLen = 0;
43
44        return m_buffer;
45    }
46    void *ptr() { return m_buffer; }
47    size_t len() { return m_bufferLen; }
48private:
49    unsigned char *m_buffer;
50    size_t m_bufferLen;
51};
52
53#endif
54