1// Ceres Solver - A fast non-linear least squares minimizer
2// Copyright 2010, 2011, 2012 Google Inc. All rights reserved.
3// http://code.google.com/p/ceres-solver/
4//
5// Redistribution and use in source and binary forms, with or without
6// modification, are permitted provided that the following conditions are met:
7//
8// * Redistributions of source code must retain the above copyright notice,
9//   this list of conditions and the following disclaimer.
10// * Redistributions in binary form must reproduce the above copyright notice,
11//   this list of conditions and the following disclaimer in the documentation
12//   and/or other materials provided with the distribution.
13// * Neither the name of Google Inc. nor the names of its contributors may be
14//   used to endorse or promote products derived from this software without
15//   specific prior written permission.
16//
17// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
21// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27// POSSIBILITY OF SUCH DAMAGE.
28//
29// Author: keir@google.com (Keir Mierle)
30//
31// Really simple file IO.
32
33#include "ceres/file.h"
34
35#include <cstdio>
36#include "glog/logging.h"
37
38namespace ceres {
39namespace internal {
40
41using std::string;
42
43void WriteStringToFileOrDie(const string &data, const string &filename) {
44  FILE* file_descriptor = fopen(filename.c_str(), "wb");
45  if (!file_descriptor) {
46    LOG(FATAL) << "Couldn't write to file: " << filename;
47  }
48  fwrite(data.c_str(), 1, data.size(), file_descriptor);
49  fclose(file_descriptor);
50}
51
52void ReadFileToStringOrDie(const string &filename, string *data) {
53  FILE* file_descriptor = fopen(filename.c_str(), "r");
54
55  if (!file_descriptor) {
56    LOG(FATAL) << "Couldn't read file: " << filename;
57  }
58
59  // Resize the input buffer appropriately.
60  fseek(file_descriptor, 0L, SEEK_END);
61  int num_bytes = ftell(file_descriptor);
62  data->resize(num_bytes);
63
64  // Read the data.
65  fseek(file_descriptor, 0L, SEEK_SET);
66  int num_read = fread(&((*data)[0]),
67                       sizeof((*data)[0]),
68                       num_bytes,
69                       file_descriptor);
70  if (num_read != num_bytes) {
71    LOG(FATAL) << "Couldn't read all of " << filename
72               << "expected bytes: " << num_bytes * sizeof((*data)[0])
73               << "actual bytes: " << num_read;
74  }
75  fclose(file_descriptor);
76}
77
78string JoinPath(const string& dirname, const string& basename) {
79#ifdef _WIN32
80    static const char separator = '\\';
81#else
82    static const char separator = '/';
83#endif  // _WIN32
84
85  if ((!basename.empty() && basename[0] == separator) || dirname.empty()) {
86    return basename;
87  } else if (dirname[dirname.size() - 1] == separator) {
88    return dirname + basename;
89  } else {
90    return dirname + string(&separator, 1) + basename;
91  }
92}
93
94}  // namespace internal
95}  // namespace ceres
96