CommonIface.hh
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1 /*
2  * Copyright (C) 2012-2015 Open Source Robotics Foundation
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  *
16 */
17 
18 #ifndef _COMMONIFACE_HH_
19 #define _COMMONIFACE_HH_
20 
21 #include <string>
22 #include <vector>
23 #include <boost/uuid/sha1.hpp>
24 #include <iomanip>
25 #include <sstream>
26 
27 #include "gazebo/util/system.hh"
28 
29 namespace gazebo
30 {
31  namespace common
32  {
35 
38  void load();
39 
43  void add_search_path_suffix(const std::string &_suffix);
44 
49  std::string find_file(const std::string &_file);
50 
57  std::string find_file(const std::string &_file,
58  bool _searchLocalPath);
59 
64  std::string find_file_path(const std::string &_file);
65 
70  template<typename T>
71  std::string get_sha1(const T &_buffer);
72 
77  const char *getEnv(const char *_name);
79  }
80 
82  // Implementation of get_sha1
83  template<typename T>
84  std::string common::get_sha1(const T &_buffer)
85  {
86  boost::uuids::detail::sha1 sha1;
87  unsigned int hash[5];
88  std::stringstream stream;
89 
90  if (_buffer.size() == 0)
91  {
92  sha1.process_bytes(NULL, 0);
93  }
94  else
95  {
96  sha1.process_bytes(&(_buffer[0]), _buffer.size() * sizeof(_buffer[0]));
97  }
98 
99  sha1.get_digest(hash);
100 
101  for (std::size_t i = 0; i < sizeof(hash) / sizeof(hash[0]); ++i)
102  {
103  stream << std::setfill('0')
104  << std::setw(sizeof(hash[0]) * 2)
105  << std::hex
106  << hash[i];
107  }
108 
109  return stream.str();
110  }
111 }
112 #endif
GZ_COMMON_VISIBLE std::string find_file_path(const std::string &_file)
search for a file in common::SystemPaths
std::string get_sha1(const T &_buffer)
Compute the SHA1 hash of an array of bytes.
Definition: CommonIface.hh:84
GZ_COMMON_VISIBLE const char * getEnv(const char *_name)
Cross platform retrieval of an environment variable.
GZ_COMMON_VISIBLE void load()
Load the common library.
#define GZ_COMMON_VISIBLE
Definition: system.hh:91
#define NULL
Definition: CommonTypes.hh:30
GZ_COMMON_VISIBLE std::string find_file(const std::string &_file)
search for file in common::SystemPaths
GZ_COMMON_VISIBLE void add_search_path_suffix(const std::string &_suffix)
add path sufix to common::SystemPaths