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/* <!-- copyright */
/*
* aria2 - The high speed download utility
*
* Copyright (C) 2010 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 "ChunkedDecodingStreamFilter.h"
#include <cassert>
#include "util.h"
#include "message.h"
#include "DlAbortEx.h"
#include "A2STR.h"
namespace aria2 {
const std::string ChunkedDecodingStreamFilter::NAME
("ChunkedDecodingStreamFilter");
size_t ChunkedDecodingStreamFilter::MAX_BUF_SIZE = 1024*1024;
ChunkedDecodingStreamFilter::ReadChunkSizeStateHandler*
ChunkedDecodingStreamFilter::readChunkSizeStateHandler_ =
new ChunkedDecodingStreamFilter::ReadChunkSizeStateHandler();
ChunkedDecodingStreamFilter::ReadTrailerStateHandler*
ChunkedDecodingStreamFilter::readTrailerStateHandler_ =
new ChunkedDecodingStreamFilter::ReadTrailerStateHandler();
ChunkedDecodingStreamFilter::ReadDataStateHandler*
ChunkedDecodingStreamFilter::readDataStateHandler_ =
new ChunkedDecodingStreamFilter::ReadDataStateHandler();
ChunkedDecodingStreamFilter::ReadDataEndStateHandler*
ChunkedDecodingStreamFilter::readDataEndStateHandler_ =
new ChunkedDecodingStreamFilter::ReadDataEndStateHandler();
ChunkedDecodingStreamFilter::StreamEndStatehandler*
ChunkedDecodingStreamFilter::streamEndStateHandler_ =
new ChunkedDecodingStreamFilter::StreamEndStatehandler();
ChunkedDecodingStreamFilter::ChunkedDecodingStreamFilter
(const SharedHandle<StreamFilter>& delegate):
StreamFilter(delegate),
state_(readChunkSizeStateHandler_),
chunkSize_(0),
bytesProcessed_(0) {}
ChunkedDecodingStreamFilter::~ChunkedDecodingStreamFilter() {}
void ChunkedDecodingStreamFilter::init() {}
bool ChunkedDecodingStreamFilter::readChunkSize
(size_t& inbufOffset, const unsigned char* inbuf, size_t inlen)
{
size_t pbufSize = buf_.size();
buf_.append(&inbuf[inbufOffset], &inbuf[inlen]);
std::string::size_type crlfPos = buf_.find(A2STR::CRLF);
if(crlfPos == std::string::npos) {
if(buf_.size() > MAX_BUF_SIZE) {
throw DL_ABORT_EX("Could not find chunk size before buffer got full.");
}
inbufOffset = inlen;
return false;
}
std::string::size_type extPos = buf_.find(A2STR::SEMICOLON_C);
if(extPos == std::string::npos || crlfPos < extPos) {
extPos = crlfPos;
}
chunkSize_ = util::parseULLInt(buf_.substr(0, extPos), 16);
assert(crlfPos+2 > pbufSize);
inbufOffset += crlfPos+2-pbufSize;
buf_.clear();
if(chunkSize_ == 0) {
state_ = readTrailerStateHandler_;
} else {
state_ = readDataStateHandler_;
}
return true;
}
bool ChunkedDecodingStreamFilter::readTrailer
(size_t& inbufOffset, const unsigned char* inbuf, size_t inlen)
{
size_t pbufSize = buf_.size();
buf_.append(&inbuf[inbufOffset], &inbuf[inlen]);
std::string::size_type crlfcrlfPos = buf_.find("\r\n\r\n");
if(crlfcrlfPos != std::string::npos) {
// TODO crlfcrlfPos == 0 case?
inbufOffset += crlfcrlfPos+4-pbufSize;
inbufOffset = inlen;
buf_.clear();
state_ = streamEndStateHandler_;
return true;
} else {
std::string::size_type crlfPos = buf_.find(A2STR::CRLF);
if(crlfPos == std::string::npos) {
if(buf_.size() > MAX_BUF_SIZE) {
throw DL_ABORT_EX
("Could not find end of stream before buffer got full.");
}
inbufOffset = inlen;
return false;
} else if(crlfPos == 0) {
inbufOffset += crlfPos+2-pbufSize;
buf_.clear();
state_ = streamEndStateHandler_;
return true;
} else {
if(buf_.size() > MAX_BUF_SIZE) {
throw DL_ABORT_EX
("Could not find end of stream before buffer got full.");
}
inbufOffset = inlen;
return false;
}
}
}
bool ChunkedDecodingStreamFilter::readData
(ssize_t& outlen,
size_t& inbufOffset,
const unsigned char* inbuf,
size_t inlen,
const SharedHandle<BinaryStream>& out,
const SharedHandle<Segment>& segment)
{
uint64_t readlen =
std::min(chunkSize_, static_cast<uint64_t>(inlen-inbufOffset));
outlen += getDelegate()->transform(out, segment, inbuf+inbufOffset, readlen);
chunkSize_ -= readlen;
inbufOffset += readlen;
if(chunkSize_ == 0) {
state_ = readDataEndStateHandler_;
return true;
} else {
return false;
}
}
bool ChunkedDecodingStreamFilter::readDataEnd
(size_t& inbufOffset, const unsigned char* inbuf, size_t inlen)
{
size_t pbufSize = buf_.size();
buf_.append(&inbuf[inbufOffset], &inbuf[inlen]);
if(buf_.size() >= 2) {
if(util::startsWith(buf_, A2STR::CRLF)) {
inbufOffset += 2-pbufSize;
buf_.clear();
state_ = readChunkSizeStateHandler_;
return true;
} else {
throw DL_ABORT_EX("No CRLF at the end of chunk.");
}
} else {
inbufOffset = inlen;
return false;
}
}
ssize_t ChunkedDecodingStreamFilter::transform
(const SharedHandle<BinaryStream>& out,
const SharedHandle<Segment>& segment,
const unsigned char* inbuf, size_t inlen)
{
size_t inbufOffset = 0;
ssize_t outlen = 0;
while(inbufOffset < inlen) {
ssize_t olen = 0;
bool r = state_->execute
(this, olen, inbufOffset, inbuf, inlen, out, segment);
outlen += olen;
if(!r) {
break;
}
}
bytesProcessed_ = inbufOffset;
return outlen;
}
bool ChunkedDecodingStreamFilter::finished()
{
return state_ == streamEndStateHandler_ && getDelegate()->finished();
}
void ChunkedDecodingStreamFilter::release() {}
const std::string& ChunkedDecodingStreamFilter::getName() const
{
return NAME;
}
} // namespace aria2
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