1 // Copyright 2016 The Chromium OS Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #ifndef CHROMIUMOS_WIDE_PROFILING_FILE_UTILS_H_
6 #define CHROMIUMOS_WIDE_PROFILING_FILE_UTILS_H_
7 
8 #include <vector>
9 
10 #include "base/logging.h"
11 #include "compat/string.h"
12 
13 namespace quipper {
14 
15 // Reads the contents of a file into |contents|. Returns true on success, false
16 // if it fails.
17 bool FileToBuffer(const string& filename, std::vector<char>* contents);
18 
19 // Writes |contents| to a file, overwriting the file if it exists. Returns true
20 // on success, false if it fails.
21 template <typename CharContainer>
22 bool BufferToFile(const string& filename, const CharContainer& contents) {
23   FILE* fp = fopen(filename.c_str(), "wb");
24   if (!fp) return false;
25   // Do not write anything if |contents| contains nothing.  fopen will create
26   // an empty file.
27   if (!contents.empty()) {
28     CHECK_EQ(fwrite(contents.data(), sizeof(typename CharContainer::value_type),
29                     contents.size(), fp),
30              contents.size());
31   }
32   fclose(fp);
33   return true;
34 }
35 
36 // Returns true iff the file exists.
37 bool FileExists(const string& filename);
38 
39 }  // namespace quipper
40 
41 #endif  // CHROMIUMOS_WIDE_PROFILING_FILE_UTILS_H_
42