mirror of https://github.com/aria2/aria2
105 lines
3.7 KiB
C++
105 lines
3.7 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) 2010 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 "SinkStreamFilter.h"
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#include <cstring>
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#include <cassert>
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#include "BinaryStream.h"
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#include "Segment.h"
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#include "WrDiskCache.h"
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#include "Piece.h"
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namespace aria2 {
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const std::string SinkStreamFilter::NAME("SinkStreamFilter");
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SinkStreamFilter::SinkStreamFilter(WrDiskCache* wrDiskCache, bool hashUpdate):
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wrDiskCache_(wrDiskCache),
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hashUpdate_(hashUpdate),
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bytesProcessed_(0) {}
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ssize_t SinkStreamFilter::transform
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(const std::shared_ptr<BinaryStream>& out,
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const std::shared_ptr<Segment>& segment,
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const unsigned char* inbuf, size_t inlen)
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{
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size_t wlen;
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if(inlen > 0) {
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if(segment->getLength() > 0) {
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// We must not write data larger than available space in
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// segment.
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assert(segment->getLength() >= segment->getWrittenLength());
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size_t lenAvail = segment->getLength()-segment->getWrittenLength();
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wlen = std::min(inlen, lenAvail);
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} else {
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wlen = inlen;
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}
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const std::shared_ptr<Piece>& piece = segment->getPiece();
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if(piece->getWrDiskCacheEntry()) {
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assert(wrDiskCache_);
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// If we receive small data (e.g., 1 or 2 bytes), cache entry
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// becomes a headache. To mitigate this problem, we allocate
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// cache buffer at least 4KiB and append the data to the
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// contagious cache data.
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size_t alen = piece->appendWrCache(wrDiskCache_,
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segment->getPositionToWrite(),
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inbuf, wlen);
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if(alen < wlen) {
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size_t len = wlen - alen;
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size_t capacity = std::max(len, static_cast<size_t>(4096));
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auto dataCopy = new unsigned char[capacity];
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memcpy(dataCopy, inbuf + alen, len);
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piece->updateWrCache(wrDiskCache_, dataCopy, 0, len, capacity,
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segment->getPositionToWrite() + alen);
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}
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} else {
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out->writeData(inbuf, wlen, segment->getPositionToWrite());
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}
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#ifdef ENABLE_MESSAGE_DIGEST
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if(hashUpdate_) {
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segment->updateHash(segment->getWrittenLength(), inbuf, wlen);
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}
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#endif // ENABLE_MESSAGE_DIGEST
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segment->updateWrittenLength(wlen);
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} else {
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wlen = 0;
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}
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bytesProcessed_ = wlen;
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return bytesProcessed_;
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}
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} // namespace aria2
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