/**
 * Orthanc - A Lightweight, RESTful DICOM Store
 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
 * Department, University Hospital of Liege, Belgium
 * Copyright (C) 2017-2020 Osimis S.A., Belgium
 *
 * 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 3 of the
 * License, or (at your option) any later version.
 *
 * In addition, as a special exception, the copyright holders of this
 * program give permission to link the code of its release with the
 * OpenSSL project's "OpenSSL" library (or with modified versions of it
 * that use the same license as the "OpenSSL" library), and distribute
 * the linked executables. 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.
 * 
 * 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, see <http://www.gnu.org/licenses/>.
 **/

#include "../PrecompiledHeaders.h"
#include "BufferHttpSender.h"

#include "../OrthancException.h"

#include <cassert>

namespace Orthanc
{
  BufferHttpSender::BufferHttpSender() :
    position_(0), 
    chunkSize_(0),
    currentChunkSize_(0)
  {
  }


  bool BufferHttpSender::ReadNextChunk()
  {
    assert(position_ + currentChunkSize_ <= buffer_.size());

    position_ += currentChunkSize_;

    if (position_ == buffer_.size())
    {
      return false;
    }
    else
    {
      currentChunkSize_ = buffer_.size() - position_;

      if (chunkSize_ != 0 &&
          currentChunkSize_ > chunkSize_)
      {
        currentChunkSize_ = chunkSize_;
      }

      return true;
    }
  }


  const char* BufferHttpSender::GetChunkContent()
  {
    return buffer_.c_str() + position_;
  }


  size_t BufferHttpSender::GetChunkSize()
  {
    return currentChunkSize_;
  }
}