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
38 namespace ceres {
39 namespace internal {
40
41 using std::string;
42
WriteStringToFileOrDie(const string & data,const string & filename)43 void 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
ReadFileToStringOrDie(const string & filename,string * data)52 void 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
JoinPath(const string & dirname,const string & basename)78 string 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