128 lines
4.2 KiB
C++
128 lines
4.2 KiB
C++
/* <!-- copyright */
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/*
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* aria2 - The high speed download utility
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*
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* Copyright (C) 2006 Tatsuhiro Tsujikawa
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* In addition, as a special exception, the copyright holders give
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* permission to link the code of portions of this program with the
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* OpenSSL library under certain conditions as described in each
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* individual source file, and distribute linked combinations
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* including the two.
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* You must obey the GNU General Public License in all respects
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* for all of the code used other than OpenSSL. If you modify
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* file(s) with this exception, you may extend this exception to your
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* version of the file(s), but you are not obligated to do so. If you
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* do not wish to do so, delete this exception statement from your
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* version. If you delete this exception statement from all source
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* files in the program, then also delete it here.
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*/
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/* copyright --> */
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#include "PeerMessageUtil.h"
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#include "DlAbortEx.h"
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#include "Util.h"
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#include <netinet/in.h>
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int8_t PeerMessageUtil::getId(const unsigned char* msg) {
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return msg[0];
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}
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int32_t PeerMessageUtil::getIntParam(const unsigned char* msg, int32_t offset) {
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int32_t nParam;
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memcpy(&nParam, msg+offset, sizeof(int32_t));
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return ntohl(nParam);
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}
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int16_t PeerMessageUtil::getShortIntParam(const unsigned char* msg, int32_t offset) {
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int16_t nParam;
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memcpy(&nParam, msg+offset, sizeof(int16_t));
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return ntohs(nParam);
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}
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void PeerMessageUtil::checkIndex(int32_t index, int32_t pieces) {
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if(!(0 <= index && index < (int32_t)pieces)) {
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throw new DlAbortEx("Invalid index: %d", index);
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}
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}
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void PeerMessageUtil::checkBegin(int32_t begin, int32_t pieceLength) {
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if(!(0 <= begin && begin < (int32_t)pieceLength)) {
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throw new DlAbortEx("Invalid begin: %d", begin);
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}
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}
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void PeerMessageUtil::checkLength(int32_t length) {
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if(length > MAX_BLOCK_LENGTH) {
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throw new DlAbortEx("Length too long: %d > %dKB", length,
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MAX_BLOCK_LENGTH/1024);
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}
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if(length <= 0) {
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throw new DlAbortEx("Invalid length: %d", length);
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}
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if(!Util::isPowerOf(length, 2)) {
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throw new DlAbortEx("Invalid length: %d It is not power of 2",
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length);
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}
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}
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void PeerMessageUtil::checkRange(int32_t begin, int32_t length, int32_t pieceLength) {
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if(!(0 <= begin && 0 < length)) {
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throw new DlAbortEx("Invalid range: begin=%d, length=%d",
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begin, length);
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}
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int32_t end = begin+length;
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if(!(0 < end && end <= pieceLength)) {
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throw new DlAbortEx("Invalid range: begin=%d, length=%d",
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begin, length);
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}
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}
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void PeerMessageUtil::checkBitfield(const unsigned char* bitfield,
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int32_t bitfieldLength,
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int32_t pieces) {
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if(!(bitfieldLength == BITFIELD_LEN_FROM_PIECES(pieces))) {
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throw new DlAbortEx("Invalid bitfield length: %d",
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bitfieldLength);
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}
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char lastbyte = bitfield[bitfieldLength-1];
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for(int32_t i = 0; i < 8-pieces%8 && pieces%8 != 0; ++i) {
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if(!(((lastbyte >> i) & 1) == 0)) {
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throw new DlAbortEx("Invalid bitfield");
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}
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}
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}
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void PeerMessageUtil::setIntParam(unsigned char* dest, int32_t param) {
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int32_t nParam = htonl(param);
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memcpy(dest, &nParam, sizeof(int32_t));
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}
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void PeerMessageUtil::setShortIntParam(unsigned char* dest, int16_t param) {
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int16_t nParam = htons(param);
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memcpy(dest, &nParam, sizeof(int16_t));
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}
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void PeerMessageUtil::createPeerMessageString(unsigned char* msg,
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int32_t msgLength,
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int32_t payloadLength,
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int8_t messageId) {
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assert(msgLength >= 5);
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memset(msg, 0, msgLength);
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setIntParam(msg, payloadLength);
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msg[4] = messageId;
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}
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