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/* <!-- copyright */
/*
* aria2 - The high speed download utility
*
* Copyright (C) 2012 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");
namespace {
enum {
PREV_CHUNK_SIZE,
CHUNK_SIZE,
CHUNK_EXTENSION,
PREV_CHUNK_SIZE_LF,
CHUNK,
PREV_CHUNK_CR,
PREV_CHUNK_LF,
PREV_TRAILER,
TRAILER,
PREV_TRAILER_LF,
PREV_END_CR,
PREV_END_LF,
CHUNKS_COMPLETE
};
} // namespace
ChunkedDecodingStreamFilter::ChunkedDecodingStreamFilter
(std::unique_ptr<StreamFilter> delegate)
: StreamFilter{std::move(delegate)},
state_{PREV_CHUNK_SIZE},
chunkSize_{0},
chunkRemaining_{0},
bytesProcessed_{0}
{}
ChunkedDecodingStreamFilter::~ChunkedDecodingStreamFilter() {}
void ChunkedDecodingStreamFilter::init() {}
ssize_t ChunkedDecodingStreamFilter::transform
(const std::shared_ptr<BinaryStream>& out,
const std::shared_ptr<Segment>& segment,
const unsigned char* inbuf, size_t inlen)
{
ssize_t outlen = 0;
size_t i;
bytesProcessed_ = 0;
for(i = 0; i < inlen; ++i) {
unsigned char c = inbuf[i];
switch(state_) {
case PREV_CHUNK_SIZE:
if(util::isHexDigit(c)) {
chunkSize_ = util::hexCharToUInt(c);
state_ = CHUNK_SIZE;
} else {
throw DL_ABORT_EX("Bad chunk size: not hex string");
}
break;
case CHUNK_SIZE:
if(util::isHexDigit(c)) {
if(chunkSize_ & 0x7800000000000000LL) {
throw DL_ABORT_EX("Too big chunk size");
}
chunkSize_ <<= 4;
chunkSize_ += util::hexCharToUInt(c);
} else if(c == ';') {
state_ = CHUNK_EXTENSION;
} else if(c == '\r') {
state_ = PREV_CHUNK_SIZE_LF;
} else {
throw DL_ABORT_EX("Bad chunk size: not hex string");
}
break;
case CHUNK_EXTENSION:
if(c == '\r') {
state_ = PREV_CHUNK_SIZE_LF;
}
break;
case PREV_CHUNK_SIZE_LF:
if(c == '\n') {
chunkRemaining_ = chunkSize_;
if(chunkSize_ == 0) {
state_ = PREV_TRAILER;
} else {
state_ = CHUNK;
}
} else {
throw DL_ABORT_EX("Bad chunk encoding: "
"missing LF at the end of chunk size");
}
break;
case CHUNK: {
int64_t readlen = std::min(chunkRemaining_,
static_cast<int64_t>(inlen-i));
outlen += getDelegate()->transform(out, segment, inbuf+i, readlen);
chunkRemaining_ -= readlen;
i += readlen-1;
if(chunkRemaining_ == 0) {
state_ = PREV_CHUNK_CR;
}
break;
}
case PREV_CHUNK_CR:
if(c == '\r') {
state_ = PREV_CHUNK_LF;
} else {
throw DL_ABORT_EX("Bad chunk encoding: "
"missing CR at the end of chunk");
}
break;
case PREV_CHUNK_LF:
if(c == '\n') {
if(chunkSize_ == 0) {
state_ = PREV_TRAILER;
} else {
chunkSize_ = chunkRemaining_ = 0;
state_ = PREV_CHUNK_SIZE;
}
} else {
throw DL_ABORT_EX("Bad chunk encoding: "
"missing LF at the end of chunk");
}
break;
case PREV_TRAILER:
if(c == '\r') {
// No trailer
state_ = PREV_END_LF;
} else {
state_= TRAILER;
}
break;
case TRAILER:
if(c == '\r') {
state_ = PREV_TRAILER_LF;
}
break;
case PREV_TRAILER_LF:
if(c == '\n') {
state_ = PREV_TRAILER;
} else {
throw DL_ABORT_EX("Bad chunk encoding: "
"missing LF at the end of trailer");
}
break;
case PREV_END_LF:
if(c == '\n') {
state_ = CHUNKS_COMPLETE;
} else {
throw DL_ABORT_EX("Bad chunk encoding: "
"missing LF at the end of chunks");
}
break;
case CHUNKS_COMPLETE:
goto fin;
default:
// unreachable
assert(0);
}
}
fin:
bytesProcessed_ += i;
return outlen;
}
bool ChunkedDecodingStreamFilter::finished()
{
return state_ == CHUNKS_COMPLETE && getDelegate()->finished();
}
void ChunkedDecodingStreamFilter::release() {}
const std::string& ChunkedDecodingStreamFilter::getName() const
{
return NAME;
}
} // namespace aria2
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