/* <!-- copyright */
/*
 * aria2 - The high speed download utility
 *
 * Copyright (C) 2009 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 "FallocFileAllocationIterator.h"
#include "DlAbortEx.h"
#include "util.h"
#include "LogFactory.h"

namespace aria2 {

#ifdef __MINGW32__
bool FallocFileAllocationIterator::gainPrivilegeAttempted_ = false;
#endif // __MINGW32__

FallocFileAllocationIterator::FallocFileAllocationIterator(BinaryStream* stream,
                                                           int64_t offset,
                                                           int64_t totalLength)
    : stream_(stream), offset_(offset), totalLength_(totalLength)
{
#ifdef __MINGW32__
  // Windows build: --file-allocation=falloc uses SetFileValidData
  // which requires SE_MANAGE_VOLUME_NAME privilege.  SetFileValidData
  // has security implications (see
  // https://msdn.microsoft.com/en-us/library/windows/desktop/aa365544%28v=vs.85%29.aspx).
  if (!gainPrivilegeAttempted_) {
    if (!util::gainPrivilege(SE_MANAGE_VOLUME_NAME)) {
      A2_LOG_WARN("--file-allocation=falloc will not work properly.");
    }

    gainPrivilegeAttempted_ = true;
  }
#endif // __MINGW32__
}

void FallocFileAllocationIterator::allocateChunk()
{
  if (offset_ < totalLength_) {
    stream_->allocate(offset_, totalLength_ - offset_, false);
    offset_ = totalLength_;
  }
  else {
    stream_->truncate(totalLength_);
    offset_ = totalLength_;
  }
}

bool FallocFileAllocationIterator::finished()
{
  return offset_ == totalLength_;
}

int64_t FallocFileAllocationIterator::getCurrentLength() { return offset_; }

int64_t FallocFileAllocationIterator::getTotalLength() { return totalLength_; }

} // namespace aria2