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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 "AdaptiveFileAllocationIterator.h"
#include "BinaryStream.h"
#include "SingleFileAllocationIterator.h"
#include "RecoverableException.h"
#include "LogFactory.h"
#include "Logger.h"
#include "a2functional.h"
#ifdef HAVE_FALLOCATE
# include "FallocFileAllocationIterator.h"
#endif // HAVE_FALLOCATE
namespace aria2 {
AdaptiveFileAllocationIterator::AdaptiveFileAllocationIterator(
BinaryStream* stream, int64_t offset, int64_t totalLength)
: stream_(stream), offset_(offset), totalLength_(totalLength)
{
}
AdaptiveFileAllocationIterator::~AdaptiveFileAllocationIterator() = default;
void AdaptiveFileAllocationIterator::allocateChunk()
{
if (!allocator_) {
#ifdef HAVE_FALLOCATE
try {
A2_LOG_DEBUG("Testing file system supports fallocate.");
if (offset_ < totalLength_) {
int64_t len =
std::min(totalLength_ - offset_, static_cast<int64_t>(4_k));
stream_->allocate(offset_, len, false);
offset_ += len;
}
A2_LOG_DEBUG("File system supports fallocate.");
allocator_ = make_unique<FallocFileAllocationIterator>(stream_, offset_,
totalLength_);
}
catch (RecoverableException& e) {
A2_LOG_DEBUG("File system does not support fallocate.");
auto salloc = make_unique<SingleFileAllocationIterator>(stream_, offset_,
totalLength_);
salloc->init();
allocator_ = std::move(salloc);
}
#else // !HAVE_FALLOCATE
auto salloc = make_unique<SingleFileAllocationIterator>(stream_, offset_,
totalLength_);
salloc->init();
allocator_ = std::move(salloc);
#endif // !HAVE_FALLOCATE
allocator_->allocateChunk();
}
else {
allocator_->allocateChunk();
}
}
bool AdaptiveFileAllocationIterator::finished()
{
if (!allocator_) {
return offset_ == totalLength_;
}
else {
return allocator_->finished();
}
}
int64_t AdaptiveFileAllocationIterator::getCurrentLength()
{
if (!allocator_) {
return offset_;
}
else {
return allocator_->getCurrentLength();
}
}
int64_t AdaptiveFileAllocationIterator::getTotalLength()
{
return totalLength_;
}
} // namespace aria2
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