/**
 * Palantir - A Lightweight, RESTful DICOM Store
 * Copyright (C) 2012 Medical Physics Department, CHU of Liege,
 * 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.
 * 
 * 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 "ChunkedBuffer.h"

#include <cassert>
#include <string.h>


namespace Palantir
{
  void ChunkedBuffer::Clear()
  {
    numBytes_ = 0;

    for (Chunks::iterator it = chunks_.begin(); 
         it != chunks_.end(); it++)
    {
      delete *it;
    }
  }


  void ChunkedBuffer::AddChunk(const char* chunkData,
                               size_t chunkSize)
  {
    if (chunkSize == 0)
    {
      return;
    }

    assert(chunkData != NULL);
    chunks_.push_back(new std::string(chunkData, chunkSize));
    numBytes_ += chunkSize;
  }


  void ChunkedBuffer::Flatten(std::string& result)
  {
    result.resize(numBytes_);

    size_t pos = 0;
    for (Chunks::iterator it = chunks_.begin(); 
         it != chunks_.end(); it++)
    {
      assert(*it != NULL);

      size_t s = (*it)->size();
      if (s != 0)
      {
        memcpy(&result[pos], (*it)->c_str(), s);
        pos += s;
      }

      delete *it;
    }

    chunks_.clear();
  }
}