CommonIface.hh

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/*
 * Copyright (C) 2012-2016 Open Source Robotics Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
*/

#ifndef _COMMONIFACE_HH_
#define _COMMONIFACE_HH_

#include <string>
#include <vector>
#include <boost/uuid/sha1.hpp>
#include <iomanip>
#include <sstream>

#include "gazebo/util/system.hh"

namespace gazebo
{
  namespace common
  {

    GZ_COMMON_VISIBLE
    void load();

    GZ_COMMON_VISIBLE
    void add_search_path_suffix(const std::string &_suffix);

    GZ_COMMON_VISIBLE
    std::string find_file(const std::string &_file);

    GZ_COMMON_VISIBLE
    std::string find_file(const std::string &_file,
                          bool _searchLocalPath);

    GZ_COMMON_VISIBLE
    std::string find_file_path(const std::string &_file);

    template<typename T>
    std::string get_sha1(const T &_buffer);

    GZ_COMMON_VISIBLE
    const char *getEnv(const char *_name);
  }

  // Implementation of get_sha1
  template<typename T>
  std::string common::get_sha1(const T &_buffer)
  {
    boost::uuids::detail::sha1 sha1;
    unsigned int hash[5];
    std::stringstream stream;

    if (_buffer.size() == 0)
    {
      sha1.process_bytes(NULL, 0);
    }
    else
    {
      sha1.process_bytes(&(_buffer[0]), _buffer.size() * sizeof(_buffer[0]));
    }

    sha1.get_digest(hash);

    for (std::size_t i = 0; i < sizeof(hash) / sizeof(hash[0]); ++i)
    {
      stream << std::setfill('0')
             << std::setw(sizeof(hash[0]) * 2)
             << std::hex
             << hash[i];
    }

    return stream.str();
  }
}
#endif