text: /* <!-- copyright */
  /*
   * aria2 - The high speed download utility
   *
   * Copyright (C) 2006 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 "SingleFileAllocationIterator.h"
  
  #include <cstring>
  #include <cstdlib>
  
  #include "BinaryStream.h"
  #include "util.h"
  #include "a2io.h"
  #include "Logger.h"
  #include "LogFactory.h"
  
  namespace aria2 {
  
  #define BUFSIZE (256*1024)
  #define ALIGNMENT 512
  
  SingleFileAllocationIterator::SingleFileAllocationIterator
  (BinaryStream* stream,
   int64_t offset,
   int64_t totalLength)
    : stream_(stream),
      offset_(offset),
      totalLength_(totalLength),
      buffer_(nullptr)
  {}
  
  SingleFileAllocationIterator::~SingleFileAllocationIterator()
  {
  #ifdef HAVE_POSIX_MEMALIGN
    free(buffer_);
  #else
    delete [] buffer_;
  #endif // HAVE_POSIX_MEMALIGN
  }
  
  void SingleFileAllocationIterator::init()
  {
    static bool noticeDone = false;
    if(!noticeDone) {
      noticeDone = true;
      A2_LOG_NOTICE(_("Allocating disk space. Use --file-allocation=none to"
                      " disable it. See --file-allocation option in man page for"
                      " more details."));
    }
  #ifdef HAVE_POSIX_MEMALIGN
    buffer_ = reinterpret_cast<unsigned char*>
      (util::allocateAlignedMemory(ALIGNMENT, BUFSIZE));
  #else
    buffer_ = new unsigned char[BUFSIZE];
  #endif // HAVE_POSIX_MEMALIGN
    memset(buffer_, 0, BUFSIZE);
  }
  
  void SingleFileAllocationIterator::allocateChunk()
  {
    stream_->writeData(buffer_, BUFSIZE, offset_);
    offset_ += BUFSIZE;
  
    if(totalLength_ < offset_) {
      stream_->truncate(totalLength_);
      offset_ = totalLength_;
    }
  }
  
  bool SingleFileAllocationIterator::finished()
  {
    return offset_ == totalLength_;
  }
  
  } // namespace aria2
  