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/* <!-- copyright */
/*
* aria2 - The high speed download utility
*
* Copyright (C) 2006 Tatsuhiro Tsujikawa
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
/* copyright --> */
#ifndef _D_PEER_MESSAGE_UTIL_H_
#define _D_PEER_MESSAGE_UTIL_H_
#include "common.h"
#include <string>
#include <utility>
namespace aria2 {
class PeerMessageUtil {
private:
PeerMessageUtil() {}
public:
static uint32_t getIntParam(const unsigned char* msg, size_t pos);
static uint16_t getShortIntParam(const unsigned char* msg, size_t pos);
static void setIntParam(unsigned char* dest, uint32_t param);
static void setShortIntParam(unsigned char* dest, uint16_t param);
static uint8_t getId(const unsigned char* msg);
static void checkIndex(size_t index, size_t pieces);
static void checkBegin(uint32_t begin, size_t pieceLength);
static void checkLength(size_t length);
static void checkRange(uint32_t begin, size_t length, size_t pieceLength);
static void checkBitfield(const unsigned char* bitfield,
size_t bitfieldLength,
size_t pieces);
static void createPeerMessageString(unsigned char* msg,
size_t msgLength,
size_t payloadLength,
uint8_t messageId);
/**
* Creates compact tracker format(6bytes for ipv4 address and port)
* and stores the results in compact.
* compact must be at least 6 bytes and pre-allocated.
* Returns true if creation is successful, otherwise returns false.
* The example of failure reason is that addr is not numbers-and-dots
* notation.
*/
static bool createcompact(unsigned char* compact, const std::string& addr, uint16_t port);
static std::pair<std::string, uint16_t> unpackcompact(const unsigned char* compact);
// Throws exception if threshold >= actual
static void assertPayloadLengthGreater(size_t threshold, size_t actual,
const std::string& msgName);
// Throws exception if expected != actual
static void assertPayloadLengthEqual(size_t expected, size_t actual,
const std::string& msgName);
// Throws exception if expected is not equal to id from data.
static void assertID(uint8_t expected, const unsigned char* data,
const std::string& msgName);
};
} // namespace aria2
#endif // _D_PEER_MESSAGE_UTIL_H_
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