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Side by Side Diff: base/files/file_enumerator_win.cc

Issue 1446363003: Deleted OS_WIN and all Windows specific files from base. (Closed) Base URL: https://github.com/domokit/mojo.git@base_tests
Patch Set: Created 5 years, 1 month ago
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1 // Copyright (c) 2013 The Chromium 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 #include "base/files/file_enumerator.h"
6
7 #include <string.h>
8
9 #include "base/logging.h"
10 #include "base/threading/thread_restrictions.h"
11 #include "base/win/windows_version.h"
12
13 namespace base {
14
15 // FileEnumerator::FileInfo ----------------------------------------------------
16
17 FileEnumerator::FileInfo::FileInfo() {
18 memset(&find_data_, 0, sizeof(find_data_));
19 }
20
21 bool FileEnumerator::FileInfo::IsDirectory() const {
22 return (find_data_.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0;
23 }
24
25 FilePath FileEnumerator::FileInfo::GetName() const {
26 return FilePath(find_data_.cFileName);
27 }
28
29 int64 FileEnumerator::FileInfo::GetSize() const {
30 ULARGE_INTEGER size;
31 size.HighPart = find_data_.nFileSizeHigh;
32 size.LowPart = find_data_.nFileSizeLow;
33 DCHECK_LE(size.QuadPart, std::numeric_limits<int64>::max());
34 return static_cast<int64>(size.QuadPart);
35 }
36
37 base::Time FileEnumerator::FileInfo::GetLastModifiedTime() const {
38 return base::Time::FromFileTime(find_data_.ftLastWriteTime);
39 }
40
41 // FileEnumerator --------------------------------------------------------------
42
43 FileEnumerator::FileEnumerator(const FilePath& root_path,
44 bool recursive,
45 int file_type)
46 : recursive_(recursive),
47 file_type_(file_type),
48 has_find_data_(false),
49 find_handle_(INVALID_HANDLE_VALUE) {
50 // INCLUDE_DOT_DOT must not be specified if recursive.
51 DCHECK(!(recursive && (INCLUDE_DOT_DOT & file_type_)));
52 memset(&find_data_, 0, sizeof(find_data_));
53 pending_paths_.push(root_path);
54 }
55
56 FileEnumerator::FileEnumerator(const FilePath& root_path,
57 bool recursive,
58 int file_type,
59 const FilePath::StringType& pattern)
60 : recursive_(recursive),
61 file_type_(file_type),
62 has_find_data_(false),
63 pattern_(pattern),
64 find_handle_(INVALID_HANDLE_VALUE) {
65 // INCLUDE_DOT_DOT must not be specified if recursive.
66 DCHECK(!(recursive && (INCLUDE_DOT_DOT & file_type_)));
67 memset(&find_data_, 0, sizeof(find_data_));
68 pending_paths_.push(root_path);
69 }
70
71 FileEnumerator::~FileEnumerator() {
72 if (find_handle_ != INVALID_HANDLE_VALUE)
73 FindClose(find_handle_);
74 }
75
76 FileEnumerator::FileInfo FileEnumerator::GetInfo() const {
77 if (!has_find_data_) {
78 NOTREACHED();
79 return FileInfo();
80 }
81 FileInfo ret;
82 memcpy(&ret.find_data_, &find_data_, sizeof(find_data_));
83 return ret;
84 }
85
86 FilePath FileEnumerator::Next() {
87 base::ThreadRestrictions::AssertIOAllowed();
88
89 while (has_find_data_ || !pending_paths_.empty()) {
90 if (!has_find_data_) {
91 // The last find FindFirstFile operation is done, prepare a new one.
92 root_path_ = pending_paths_.top();
93 pending_paths_.pop();
94
95 // Start a new find operation.
96 FilePath src = root_path_;
97
98 if (pattern_.empty())
99 src = src.Append(L"*"); // No pattern = match everything.
100 else
101 src = src.Append(pattern_);
102
103 if (base::win::GetVersion() >= base::win::VERSION_WIN7) {
104 // Use a "large fetch" on newer Windows which should speed up large
105 // enumerations (we seldom abort in the middle).
106 find_handle_ = FindFirstFileEx(src.value().c_str(),
107 FindExInfoBasic, // Omit short name.
108 &find_data_,
109 FindExSearchNameMatch,
110 NULL,
111 FIND_FIRST_EX_LARGE_FETCH);
112 } else {
113 find_handle_ = FindFirstFile(src.value().c_str(), &find_data_);
114 }
115 has_find_data_ = true;
116 } else {
117 // Search for the next file/directory.
118 if (!FindNextFile(find_handle_, &find_data_)) {
119 FindClose(find_handle_);
120 find_handle_ = INVALID_HANDLE_VALUE;
121 }
122 }
123
124 if (INVALID_HANDLE_VALUE == find_handle_) {
125 has_find_data_ = false;
126
127 // This is reached when we have finished a directory and are advancing to
128 // the next one in the queue. We applied the pattern (if any) to the files
129 // in the root search directory, but for those directories which were
130 // matched, we want to enumerate all files inside them. This will happen
131 // when the handle is empty.
132 pattern_ = FilePath::StringType();
133
134 continue;
135 }
136
137 FilePath cur_file(find_data_.cFileName);
138 if (ShouldSkip(cur_file))
139 continue;
140
141 // Construct the absolute filename.
142 cur_file = root_path_.Append(find_data_.cFileName);
143
144 if (find_data_.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
145 if (recursive_) {
146 // If |cur_file| is a directory, and we are doing recursive searching,
147 // add it to pending_paths_ so we scan it after we finish scanning this
148 // directory. However, don't do recursion through reparse points or we
149 // may end up with an infinite cycle.
150 DWORD attributes = GetFileAttributes(cur_file.value().c_str());
151 if (!(attributes & FILE_ATTRIBUTE_REPARSE_POINT))
152 pending_paths_.push(cur_file);
153 }
154 if (file_type_ & FileEnumerator::DIRECTORIES)
155 return cur_file;
156 } else if (file_type_ & FileEnumerator::FILES) {
157 return cur_file;
158 }
159 }
160
161 return FilePath();
162 }
163
164 } // namespace base
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