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