mirror of https://github.com/aria2/aria2
135 lines
4.5 KiB
C++
135 lines
4.5 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 "MultiFileAllocationIterator.h"
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#include "MultiDiskAdaptor.h"
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#include "FileEntry.h"
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#include "SingleFileAllocationIterator.h"
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MultiFileAllocationIterator::MultiFileAllocationIterator(MultiDiskAdaptor* diskAdaptor):
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_diskAdaptor(diskAdaptor),
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_entries(makeDiskWriterEntries(diskAdaptor->diskWriterEntries,
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diskAdaptor->getPieceLength())),
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_fileAllocationIterator(0),
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_offset(0)
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{}
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MultiFileAllocationIterator::~MultiFileAllocationIterator() {}
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void MultiFileAllocationIterator::allocateChunk()
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{
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while(_fileAllocationIterator.isNull() || _fileAllocationIterator->finished()) {
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if(_entries.empty()) {
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break;
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}
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DiskWriterEntryHandle entry = _entries.front();
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_entries.pop_front();
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FileEntryHandle fileEntry = entry->getFileEntry();
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if(entry->size() < fileEntry->getLength()) {
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entry->getDiskWriter()->enableDirectIO();
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_fileAllocationIterator =
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new SingleFileAllocationIterator(entry->getDiskWriter().get(),
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entry->size(),
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fileEntry->getLength());
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_fileAllocationIterator->init();
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}
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}
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if(finished()) {
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return;
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}
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_fileAllocationIterator->allocateChunk();
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}
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bool MultiFileAllocationIterator::finished()
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{
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return _entries.empty() && (_fileAllocationIterator.isNull() || _fileAllocationIterator->finished());
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}
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int64_t MultiFileAllocationIterator::getCurrentLength()
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{
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if(_fileAllocationIterator.isNull()) {
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return 0;
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} else {
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return _fileAllocationIterator->getCurrentLength();
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}
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}
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int64_t MultiFileAllocationIterator::getTotalLength()
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{
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if(_fileAllocationIterator.isNull()) {
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return 0;
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} else {
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return _fileAllocationIterator->getTotalLength();
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}
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}
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const DiskWriterEntries& MultiFileAllocationIterator::getDiskWriterEntries() const
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{
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return _entries;
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}
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DiskWriterEntries MultiFileAllocationIterator::makeDiskWriterEntries(const DiskWriterEntries& srcEntries, int32_t pieceLength) const
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{
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if(pieceLength == 0) {
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DiskWriterEntries entries;
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for(DiskWriterEntries::const_iterator itr = srcEntries.begin(); itr != srcEntries.end(); ++itr) {
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if((*itr)->getFileEntry()->isRequested()) {
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entries.push_back(*itr);
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}
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}
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return entries;
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}
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DiskWriterEntries temp(srcEntries);
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temp.push_front(new DiskWriterEntry(new FileEntry()));
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DiskWriterEntries entries;
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DiskWriterEntries::const_iterator done = temp.begin();
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for(DiskWriterEntries::const_iterator itr = temp.begin()+1; itr != temp.end(); ++itr) {
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FileEntryHandle fileEntry = (*itr)->getFileEntry();
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if(!fileEntry->isRequested()) {
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continue;
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}
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int64_t pieceStartOffset = (fileEntry->getOffset()/pieceLength)*pieceLength;
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for(DiskWriterEntries::const_iterator i = itr-1; i != done; --i) {
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if(pieceStartOffset < (*i)->getFileEntry()->getOffset()+(*i)->getFileEntry()->getLength()) {
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entries.push_back(*i);
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} else {
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break;
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}
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}
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entries.push_back(*itr);
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done = itr;
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}
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return entries;
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}
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