mirror of https://github.com/aria2/aria2
126 lines
3.5 KiB
C++
126 lines
3.5 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 "ChunkedDecoder.h"
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#include "util.h"
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#include "message.h"
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#include "DlAbortEx.h"
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#include "StringFormat.h"
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#include "A2STR.h"
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namespace aria2 {
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const std::string ChunkedDecoder::NAME("ChunkedDecoder");
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ChunkedDecoder::ChunkedDecoder():_chunkSize(0), _state(READ_SIZE) {}
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ChunkedDecoder::~ChunkedDecoder() {}
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void ChunkedDecoder::init() {}
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static bool readChunkSize(uint64_t& chunkSize, std::string& in)
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{
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std::string::size_type crlfPos = in.find(A2STR::CRLF);
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if(crlfPos == std::string::npos) {
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return false;
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}
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std::string::size_type extPos = in.find(A2STR::SEMICOLON_C);
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if(extPos == std::string::npos || crlfPos < extPos) {
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extPos = crlfPos;
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}
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chunkSize = util::parseULLInt(in.substr(0, extPos), 16);
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in.erase(0, crlfPos+2);
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return true;
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}
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static bool readData(std::string& out, uint64_t& chunkSize, std::string& in)
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{
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uint64_t readlen = std::min(chunkSize, static_cast<uint64_t>(in.size()));
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out.append(in.begin(), in.begin()+readlen);
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in.erase(0, readlen);
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chunkSize -= readlen;
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if(chunkSize == 0 && in.size() >= 2) {
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if(in.find(A2STR::CRLF) == 0) {
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in.erase(0, 2);
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return true;
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} else {
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throw DL_ABORT_EX(EX_INVALID_CHUNK_SIZE);
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}
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} else {
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return false;
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}
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}
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std::string ChunkedDecoder::decode(const unsigned char* inbuf, size_t inlen)
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{
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_buf.append(&inbuf[0], &inbuf[inlen]);
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std::string outbuf;
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while(1) {
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if(_state == READ_SIZE) {
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if(readChunkSize(_chunkSize, _buf)) {
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if(_chunkSize == 0) {
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_state = STREAM_END;
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break;
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} else {
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_state = READ_DATA;
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}
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} else {
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break;
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}
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} else if(_state == READ_DATA) {
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if(readData(outbuf, _chunkSize, _buf)) {
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_state = READ_SIZE;
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} else {
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break;
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}
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}
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}
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return outbuf;
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}
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bool ChunkedDecoder::finished()
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{
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return _state == STREAM_END;
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}
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void ChunkedDecoder::release() {}
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const std::string& ChunkedDecoder::getName() const
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{
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return NAME;
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}
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} // namespace aria2
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