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 29 ~FixedBuffer() { 30 delete [] m_buffer; 31 m_bufferLen = 0; 32 } 33 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 } 48 void *ptr() { return m_buffer; } 49 size_t len() { return m_bufferLen; } 50 private: 51 unsigned char *m_buffer; 52 size_t m_bufferLen; 53 }; 54 55 #endif 56
