1 // Protocol Buffers - Google's data interchange format
2 // Copyright 2008 Google Inc. All rights reserved.
3 // https://developers.google.com/protocol-buffers/
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30
31 // Author: kenton@google.com (Kenton Varda)
32 // emulates google3/file/base/file.cc
33
34 #include <google/protobuf/testing/file.h>
35 #include <stdio.h>
36 #include <sys/stat.h>
37 #include <sys/types.h>
38 #ifdef _MSC_VER
39 #define WIN32_LEAN_AND_MEAN // yeah, right
40 #include <windows.h> // Find*File(). :(
41 // #include <direct.h>
42 #else
43 #include <dirent.h>
44 #include <unistd.h>
45 #endif
46 #include <errno.h>
47
48 #include <google/protobuf/io/io_win32.h>
49 #include <google/protobuf/stubs/logging.h>
50
51 namespace google {
52 namespace protobuf {
53
54 #ifdef _WIN32
55 // Windows doesn't have symbolic links.
56 #define lstat stat
57 // DO NOT include <io.h>, instead create functions in io_win32.{h,cc} and import
58 // them like we do below.
59 #endif
60
61 #ifdef _WIN32
62 using google::protobuf::io::win32::access;
63 using google::protobuf::io::win32::chdir;
64 using google::protobuf::io::win32::fopen;
65 using google::protobuf::io::win32::mkdir;
66 using google::protobuf::io::win32::stat;
67 #endif
68
Exists(const string & name)69 bool File::Exists(const string& name) {
70 return access(name.c_str(), F_OK) == 0;
71 }
72
ReadFileToString(const string & name,string * output,bool text_mode)73 bool File::ReadFileToString(const string& name, string* output, bool text_mode) {
74 char buffer[1024];
75 FILE* file = fopen(name.c_str(), text_mode ? "rt" : "rb");
76 if (file == NULL) return false;
77
78 while (true) {
79 size_t n = fread(buffer, 1, sizeof(buffer), file);
80 if (n <= 0) break;
81 output->append(buffer, n);
82 }
83
84 int error = ferror(file);
85 if (fclose(file) != 0) return false;
86 return error == 0;
87 }
88
ReadFileToStringOrDie(const string & name,string * output)89 void File::ReadFileToStringOrDie(const string& name, string* output) {
90 GOOGLE_CHECK(ReadFileToString(name, output)) << "Could not read: " << name;
91 }
92
WriteStringToFile(const string & contents,const string & name)93 bool File::WriteStringToFile(const string& contents, const string& name) {
94 FILE* file = fopen(name.c_str(), "wb");
95 if (file == NULL) {
96 GOOGLE_LOG(ERROR) << "fopen(" << name << ", \"wb\"): " << strerror(errno);
97 return false;
98 }
99
100 if (fwrite(contents.data(), 1, contents.size(), file) != contents.size()) {
101 GOOGLE_LOG(ERROR) << "fwrite(" << name << "): " << strerror(errno);
102 fclose(file);
103 return false;
104 }
105
106 if (fclose(file) != 0) {
107 return false;
108 }
109 return true;
110 }
111
WriteStringToFileOrDie(const string & contents,const string & name)112 void File::WriteStringToFileOrDie(const string& contents, const string& name) {
113 FILE* file = fopen(name.c_str(), "wb");
114 GOOGLE_CHECK(file != NULL)
115 << "fopen(" << name << ", \"wb\"): " << strerror(errno);
116 GOOGLE_CHECK_EQ(fwrite(contents.data(), 1, contents.size(), file),
117 contents.size())
118 << "fwrite(" << name << "): " << strerror(errno);
119 GOOGLE_CHECK(fclose(file) == 0)
120 << "fclose(" << name << "): " << strerror(errno);
121 }
122
CreateDir(const string & name,int mode)123 bool File::CreateDir(const string& name, int mode) {
124 if (!name.empty()) {
125 GOOGLE_CHECK_OK(name[name.size() - 1] != '.');
126 }
127 return mkdir(name.c_str(), mode) == 0;
128 }
129
RecursivelyCreateDir(const string & path,int mode)130 bool File::RecursivelyCreateDir(const string& path, int mode) {
131 if (CreateDir(path, mode)) return true;
132
133 if (Exists(path)) return false;
134
135 // Try creating the parent.
136 string::size_type slashpos = path.find_last_of('/');
137 if (slashpos == string::npos) {
138 // No parent given.
139 return false;
140 }
141
142 return RecursivelyCreateDir(path.substr(0, slashpos), mode) &&
143 CreateDir(path, mode);
144 }
145
DeleteRecursively(const string & name,void * dummy1,void * dummy2)146 void File::DeleteRecursively(const string& name,
147 void* dummy1, void* dummy2) {
148 if (name.empty()) return;
149
150 // We don't care too much about error checking here since this is only used
151 // in tests to delete temporary directories that are under /tmp anyway.
152
153 #ifdef _MSC_VER
154 // This interface is so weird.
155 WIN32_FIND_DATAA find_data;
156 HANDLE find_handle = FindFirstFileA((name + "/*").c_str(), &find_data);
157 if (find_handle == INVALID_HANDLE_VALUE) {
158 // Just delete it, whatever it is.
159 DeleteFileA(name.c_str());
160 RemoveDirectoryA(name.c_str());
161 return;
162 }
163
164 do {
165 string entry_name = find_data.cFileName;
166 if (entry_name != "." && entry_name != "..") {
167 string path = name + "/" + entry_name;
168 if (find_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
169 DeleteRecursively(path, NULL, NULL);
170 RemoveDirectoryA(path.c_str());
171 } else {
172 DeleteFileA(path.c_str());
173 }
174 }
175 } while(FindNextFileA(find_handle, &find_data));
176 FindClose(find_handle);
177
178 RemoveDirectoryA(name.c_str());
179 #else
180 // Use opendir()! Yay!
181 // lstat = Don't follow symbolic links.
182 struct stat stats;
183 if (lstat(name.c_str(), &stats) != 0) return;
184
185 if (S_ISDIR(stats.st_mode)) {
186 DIR* dir = opendir(name.c_str());
187 if (dir != NULL) {
188 while (true) {
189 struct dirent* entry = readdir(dir);
190 if (entry == NULL) break;
191 string entry_name = entry->d_name;
192 if (entry_name != "." && entry_name != "..") {
193 DeleteRecursively(name + "/" + entry_name, NULL, NULL);
194 }
195 }
196 }
197
198 closedir(dir);
199 rmdir(name.c_str());
200
201 } else if (S_ISREG(stats.st_mode)) {
202 remove(name.c_str());
203 }
204 #endif
205 }
206
ChangeWorkingDirectory(const string & new_working_directory)207 bool File::ChangeWorkingDirectory(const string& new_working_directory) {
208 return chdir(new_working_directory.c_str()) == 0;
209 }
210
211 } // namespace protobuf
212 } // namespace google
213