1 /* <!-- copyright */ 2 /* 3 * aria2 - The high speed download utility 4 * 5 * Copyright (C) 2011 Tatsuhiro Tsujikawa 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 * 21 * In addition, as a special exception, the copyright holders give 22 * permission to link the code of portions of this program with the 23 * OpenSSL library under certain conditions as described in each 24 * individual source file, and distribute linked combinations 25 * including the two. 26 * You must obey the GNU General Public License in all respects 27 * for all of the code used other than OpenSSL. If you modify 28 * file(s) with this exception, you may extend this exception to your 29 * version of the file(s), but you are not obligated to do so. If you 30 * do not wish to do so, delete this exception statement from your 31 * version. If you delete this exception statement from all source 32 * files in the program, then also delete it here. 33 */ 34 /* copyright --> */ 35 #ifndef D_SOCKET_RECV_BUFFER_H 36 #define D_SOCKET_RECV_BUFFER_H 37 38 #include "common.h" 39 40 #include <memory> 41 #include <array> 42 43 #include "a2functional.h" 44 45 namespace aria2 { 46 47 class SocketCore; 48 49 class SocketRecvBuffer { 50 public: 51 SocketRecvBuffer(std::shared_ptr<SocketCore> socket); 52 ~SocketRecvBuffer(); 53 // Reads data from socket as much as capacity allows. Returns the 54 // number of bytes read. 55 ssize_t recv(); 56 // Truncates the contents of buffer to 0. 57 void truncateBuffer(); 58 // Drains first n bytes of data from buffer. It is an programmer's 59 // responsibility to ensure that n is smaller or equal to the 60 // buffered data. 61 void drain(size_t n); 62 getSocket()63 const std::shared_ptr<SocketCore>& getSocket() const { return socket_; } 64 getBuffer()65 const unsigned char* getBuffer() const { return pos_; } 66 getBufferLength()67 size_t getBufferLength() const { return last_ - pos_; } 68 bufferEmpty()69 bool bufferEmpty() const { return pos_ == last_; } 70 71 private: 72 std::array<unsigned char, 16_k> buf_; 73 std::shared_ptr<SocketCore> socket_; 74 unsigned char* pos_; 75 unsigned char* last_; 76 }; 77 78 } // namespace aria2 79 80 #endif // D_SOCKET_RECV_BUFFER_H 81