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