1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
|
// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/file_util.h"
#if defined(OS_WIN)
#include <io.h>
#endif
#include <stdio.h>
#include <fstream>
#include "base/file_path.h"
#include "base/logging.h"
#include "base/string_piece.h"
#include "base/string_util.h"
#include "base/utf_string_conversions.h"
namespace {
const FilePath::CharType kExtensionSeparator = FILE_PATH_LITERAL('.');
} // namespace
namespace file_util {
bool EndsWithSeparator(const FilePath& path) {
FilePath::StringType value = path.value();
if (value.empty())
return false;
return FilePath::IsSeparator(value[value.size() - 1]);
}
bool EnsureEndsWithSeparator(FilePath* path) {
if (!DirectoryExists(*path))
return false;
if (EndsWithSeparator(*path))
return true;
FilePath::StringType& path_str =
const_cast<FilePath::StringType&>(path->value());
path_str.append(&FilePath::kSeparators[0], 1);
return true;
}
FilePath::StringType GetFileExtensionFromPath(const FilePath& path) {
FilePath::StringType file_name = path.BaseName().value();
const FilePath::StringType::size_type last_dot =
file_name.rfind(kExtensionSeparator);
return FilePath::StringType(last_dot == FilePath::StringType::npos ?
FILE_PATH_LITERAL("") :
file_name, last_dot+1);
}
void InsertBeforeExtension(FilePath* path, const FilePath::StringType& suffix) {
FilePath::StringType& value =
const_cast<FilePath::StringType&>(path->value());
const FilePath::StringType::size_type last_dot =
value.rfind(kExtensionSeparator);
const FilePath::StringType::size_type last_separator =
value.find_last_of(FilePath::StringType(FilePath::kSeparators));
if (last_dot == FilePath::StringType::npos ||
(last_separator != std::wstring::npos && last_dot < last_separator)) {
// The path looks something like "C:\pics.old\jojo" or "C:\pics\jojo".
// We should just append the suffix to the entire path.
value.append(suffix);
return;
}
value.insert(last_dot, suffix);
}
bool ContentsEqual(const FilePath& filename1, const FilePath& filename2) {
// We open the file in binary format even if they are text files because
// we are just comparing that bytes are exactly same in both files and not
// doing anything smart with text formatting.
std::ifstream file1(filename1.value().c_str(),
std::ios::in | std::ios::binary);
std::ifstream file2(filename2.value().c_str(),
std::ios::in | std::ios::binary);
// Even if both files aren't openable (and thus, in some sense, "equal"),
// any unusable file yields a result of "false".
if (!file1.is_open() || !file2.is_open())
return false;
const int BUFFER_SIZE = 2056;
char buffer1[BUFFER_SIZE], buffer2[BUFFER_SIZE];
do {
file1.read(buffer1, BUFFER_SIZE);
file2.read(buffer2, BUFFER_SIZE);
if ((file1.eof() != file2.eof()) ||
(file1.gcount() != file2.gcount()) ||
(memcmp(buffer1, buffer2, file1.gcount()))) {
file1.close();
file2.close();
return false;
}
} while (!file1.eof() || !file2.eof());
file1.close();
file2.close();
return true;
}
bool TextContentsEqual(const FilePath& filename1, const FilePath& filename2) {
std::ifstream file1(filename1.value().c_str(), std::ios::in);
std::ifstream file2(filename2.value().c_str(), std::ios::in);
// Even if both files aren't openable (and thus, in some sense, "equal"),
// any unusable file yields a result of "false".
if (!file1.is_open() || !file2.is_open())
return false;
do {
std::string line1, line2;
getline(file1, line1);
getline(file2, line2);
// Check for mismatched EOF states, or any error state.
if ((file1.eof() != file2.eof()) ||
file1.bad() || file2.bad()) {
return false;
}
// Trim all '\r' and '\n' characters from the end of the line.
std::string::size_type end1 = line1.find_last_not_of("\r\n");
if (end1 == std::string::npos)
line1.clear();
else if (end1 + 1 < line1.length())
line1.erase(end1 + 1);
std::string::size_type end2 = line2.find_last_not_of("\r\n");
if (end2 == std::string::npos)
line2.clear();
else if (end2 + 1 < line2.length())
line2.erase(end2 + 1);
if (line1 != line2)
return false;
} while (!file1.eof() || !file2.eof());
return true;
}
bool ReadFileToString(const FilePath& path, std::string* contents) {
FILE* file = OpenFile(path, "rb");
if (!file) {
return false;
}
char buf[1 << 16];
size_t len;
while ((len = fread(buf, 1, sizeof(buf), file)) > 0) {
if (contents)
contents->append(buf, len);
}
CloseFile(file);
return true;
}
bool IsDirectoryEmpty(const FilePath& dir_path) {
FileEnumerator files(dir_path, false,
static_cast<FileEnumerator::FILE_TYPE>(
FileEnumerator::FILES | FileEnumerator::DIRECTORIES));
if (files.Next().value().empty())
return true;
return false;
}
FILE* CreateAndOpenTemporaryFile(FilePath* path) {
FilePath directory;
if (!GetTempDir(&directory))
return NULL;
return CreateAndOpenTemporaryFileInDir(directory, path);
}
bool GetFileSize(const FilePath& file_path, int64* file_size) {
base::PlatformFileInfo info;
if (!GetFileInfo(file_path, &info))
return false;
*file_size = info.size;
return true;
}
bool IsDot(const FilePath& path) {
return FILE_PATH_LITERAL(".") == path.BaseName().value();
}
bool IsDotDot(const FilePath& path) {
return FILE_PATH_LITERAL("..") == path.BaseName().value();
}
bool TouchFile(const FilePath& path,
const base::Time& last_accessed,
const base::Time& last_modified) {
base::PlatformFile file =
base::CreatePlatformFile(path,
base::PLATFORM_FILE_OPEN |
base::PLATFORM_FILE_WRITE_ATTRIBUTES,
NULL, NULL);
if (file != base::kInvalidPlatformFileValue) {
bool result = base::TouchPlatformFile(file, last_accessed, last_modified);
base::ClosePlatformFile(file);
return result;
}
return false;
}
bool SetLastModifiedTime(const FilePath& path,
const base::Time& last_modified) {
return TouchFile(path, last_modified, last_modified);
}
bool CloseFile(FILE* file) {
if (file == NULL)
return true;
return fclose(file) == 0;
}
bool TruncateFile(FILE* file) {
if (file == NULL)
return false;
long current_offset = ftell(file);
if (current_offset == -1)
return false;
#if defined(OS_WIN)
int fd = _fileno(file);
if (_chsize(fd, current_offset) != 0)
return false;
#else
int fd = fileno(file);
if (ftruncate(fd, current_offset) != 0)
return false;
#endif
return true;
}
bool ContainsPath(const FilePath &parent, const FilePath& child) {
FilePath abs_parent = FilePath(parent);
FilePath abs_child = FilePath(child);
if (!file_util::AbsolutePath(&abs_parent) ||
!file_util::AbsolutePath(&abs_child))
return false;
#if defined(OS_WIN)
// file_util::AbsolutePath() does not flatten case on Windows, so we must do
// a case-insensitive compare.
if (!StartsWith(abs_child.value(), abs_parent.value(), false))
#else
if (!StartsWithASCII(abs_child.value(), abs_parent.value(), true))
#endif
return false;
// file_util::AbsolutePath() normalizes '/' to '\' on Windows, so we only need
// to check kSeparators[0].
if (abs_child.value().length() <= abs_parent.value().length() ||
abs_child.value()[abs_parent.value().length()] !=
FilePath::kSeparators[0])
return false;
return true;
}
int64 ComputeDirectorySize(const FilePath& root_path) {
int64 running_size = 0;
FileEnumerator file_iter(root_path, true, FileEnumerator::FILES);
for (FilePath current = file_iter.Next(); !current.empty();
current = file_iter.Next()) {
FileEnumerator::FindInfo info;
file_iter.GetFindInfo(&info);
#if defined(OS_WIN)
LARGE_INTEGER li = { info.nFileSizeLow, info.nFileSizeHigh };
running_size += li.QuadPart;
#else
running_size += info.stat.st_size;
#endif
}
return running_size;
}
int64 ComputeFilesSize(const FilePath& directory,
const FilePath::StringType& pattern) {
int64 running_size = 0;
FileEnumerator file_iter(directory, false, FileEnumerator::FILES, pattern);
for (FilePath current = file_iter.Next(); !current.empty();
current = file_iter.Next()) {
FileEnumerator::FindInfo info;
file_iter.GetFindInfo(&info);
#if defined(OS_WIN)
LARGE_INTEGER li = { info.nFileSizeLow, info.nFileSizeHigh };
running_size += li.QuadPart;
#else
running_size += info.stat.st_size;
#endif
}
return running_size;
}
///////////////////////////////////////////////
// MemoryMappedFile
MemoryMappedFile::~MemoryMappedFile() {
CloseHandles();
}
bool MemoryMappedFile::Initialize(const FilePath& file_name) {
if (IsValid())
return false;
if (!MapFileToMemory(file_name)) {
CloseHandles();
return false;
}
return true;
}
bool MemoryMappedFile::Initialize(base::PlatformFile file) {
if (IsValid())
return false;
file_ = file;
if (!MapFileToMemoryInternal()) {
CloseHandles();
return false;
}
return true;
}
bool MemoryMappedFile::IsValid() {
return data_ != NULL;
}
bool MemoryMappedFile::MapFileToMemory(const FilePath& file_name) {
file_ = base::CreatePlatformFile(
file_name, base::PLATFORM_FILE_OPEN | base::PLATFORM_FILE_READ,
NULL, NULL);
if (file_ == base::kInvalidPlatformFileValue) {
LOG(ERROR) << "Couldn't open " << file_name.value();
return false;
}
return MapFileToMemoryInternal();
}
// Deprecated functions ----------------------------------------------------
#if defined(OS_WIN)
void AppendToPath(std::wstring* path, const std::wstring& new_ending) {
if (!path) {
NOTREACHED();
return; // Don't crash in this function in release builds.
}
if (!EndsWithSeparator(FilePath(*path)))
path->push_back(FilePath::kSeparators[0]);
path->append(new_ending);
}
bool CopyDirectory(const std::wstring& from_path, const std::wstring& to_path,
bool recursive) {
return CopyDirectory(FilePath::FromWStringHack(from_path),
FilePath::FromWStringHack(to_path),
recursive);
}
bool Delete(const std::wstring& path, bool recursive) {
return Delete(FilePath::FromWStringHack(path), recursive);
}
std::wstring GetFileExtensionFromPath(const std::wstring& path) {
FilePath::StringType extension =
GetFileExtensionFromPath(FilePath::FromWStringHack(path));
return extension;
}
FILE* OpenFile(const std::wstring& filename, const char* mode) {
return OpenFile(FilePath::FromWStringHack(filename), mode);
}
int ReadFile(const std::wstring& filename, char* data, int size) {
return ReadFile(FilePath::FromWStringHack(filename), data, size);
}
int WriteFile(const std::wstring& filename, const char* data, int size) {
return WriteFile(FilePath::FromWStringHack(filename), data, size);
}
#endif // OS_WIN
///////////////////////////////////////////////
// FileEnumerator
//
// Note: the main logic is in file_util_<platform>.cc
bool FileEnumerator::ShouldSkip(const FilePath& path) {
FilePath::StringType basename = path.BaseName().value();
return IsDot(path) || (IsDotDot(path) && !(INCLUDE_DOT_DOT & file_type_));
}
} // namespace
|