Move FileEnumerator to its own file, do some refactoring.

base/files/file_enumerator.h

Index: base/files/file_enumerator.h
diff --git a/base/files/file_enumerator.h b/base/files/file_enumerator.h
new file mode 100644
index 0000000000000000000000000000000000000000..3834281c08a79830feeba99b730e43279488c213
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+++ b/base/files/file_enumerator.h
@@ -0,0 +1,156 @@
+// Copyright (c) 2012 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.
+
+#ifndef BASE_FILES_FILE_ENUMERATOR_H_
+#define BASE_FILES_FILE_ENUMERATOR_H_
+
+#include <stack>
+#include <vector>
+
+#include "base/base_export.h"
+#include "base/basictypes.h"
+#include "base/files/file_path.h"
+#include "base/time.h"
+#include "build/build_config.h"
+
+#if defined(OS_WIN)
+#include <windows.h>
+#elif defined(OS_POSIX)
+#include <sys/stat.h>
+#include <unistd.h>
+#endif
+
+namespace base {
+
+// A class for enumerating the files in a provided path. The order of the
+// results is not guaranteed.
+//
+// This is blocking. Do not use on critical threads.
+//
+// Example:
+//
+//   base::FileEnumerator enum(my_dir, false, base::FileEnumerator::FILES,
+//                             FILE_PATH_LITERAL("*.txt"));
+//   for (base::FilePath name = enum.Next(); !name.empty(); name = enum.Next())
+//     ...
+class BASE_EXPORT FileEnumerator {
+ public:
+  // Note: copy & assign supported.
+  class FileInfo {
+   public:
+    FileInfo();
+    ~FileInfo();
+
+    bool IsDirectory() const;
+
+    // The name of the file. This will not include any path information. This
+    // is in constrast to the value returned by FileEnumerator.Next() which
+    // includes the |root_path| passed into the FileEnumerator constructor.
+    FilePath GetName() const;
+
+    int64 GetSize() const;
+    Time GetLastModifiedTime() const;
+
+#if defined(OS_WIN)
+    const WIN32_FIND_DATA& find_data() const { return find_data_; }
+#elif defined(OS_POSIX)
+    const struct stat& stat() const { return stat_; }
+#endif
+
+   private:
+    friend class FileEnumerator;
+
+#if defined(OS_WIN)
+    WIN32_FIND_DATA find_data_;
+#elif defined(OS_POSIX)
+    struct stat stat_;
+    FilePath filename_;
+#endif
+  };
+
+  enum FileType {
+    FILES                 = 1 << 0,
+    DIRECTORIES           = 1 << 1,
+    INCLUDE_DOT_DOT       = 1 << 2,
+#if defined(OS_POSIX)
+    SHOW_SYM_LINKS        = 1 << 4,
+#endif
+  };
+
+  // |root_path| is the starting directory to search for. It may or may not end
+  // in a slash.
+  //
+  // If |recursive| is true, this will enumerate all matches in any
+  // subdirectories matched as well. It does a breadth-first search, so all
+  // files in one directory will be returned before any files in a
+  // subdirectory.
+  //
+  // |file_type|, a bit mask of FileType, specifies whether the enumerator
+  // should match files, directories, or both.
+  //
+  // |pattern| is an optional pattern for which files to match. This
+  // works like shell globbing. For example, "*.txt" or "Foo???.doc".
+  // However, be careful in specifying patterns that aren't cross platform
+  // since the underlying code uses OS-specific matching routines.  In general,
+  // Windows matching is less featureful than others, so test there first.
+  // If unspecified, this will match all files.
+  // NOTE: the pattern only matches the contents of root_path, not files in
+  // recursive subdirectories.
+  // TODO(erikkay): Fix the pattern matching to work at all levels.
+  FileEnumerator(const FilePath& root_path,
+                 bool recursive,
+                 int file_type);
+  FileEnumerator(const FilePath& root_path,
+                 bool recursive,
+                 int file_type,
+                 const FilePath::StringType& pattern);
+  ~FileEnumerator();
+
+  // Returns the next file or an empty string if there are no more results.
+  //
+  // The returned path will incorporate the |root_path| passed in the
+  // constructor: "<root_path>/file_name.txt". If the |root_path| is absolute,
+  // then so will be the result of Next().
+  FilePath Next();
+
+  // Write the file info into |info|.
+  FileInfo GetInfo() const;
+
+ private:
+  // Returns true if the given path should be skipped in enumeration.
+  bool ShouldSkip(const FilePath& path);
+
+#if defined(OS_WIN)
+  // True when find_data_ is valid.
+  bool has_find_data_;
+  WIN32_FIND_DATA find_data_;
+  HANDLE find_handle_;
+#elif defined(OS_POSIX)
+
+  // Read the filenames in source into the vector of DirectoryEntryInfo's
+  static bool ReadDirectory(std::vector<FileInfo>* entries,
+                            const FilePath& source, bool show_links);
+
+  // The files in the current directory
+  std::vector<FileInfo> directory_entries_;
+
+  // The next entry to use from the directory_entries_ vector
+  size_t current_directory_entry_;
+#endif
+
+  FilePath root_path_;
+  bool recursive_;
+  int file_type_;
+  FilePath::StringType pattern_;  // Empty when we want to find everything.
+
+  // A stack that keeps track of which subdirectories we still need to
+  // enumerate in the breadth-first search.
+  std::stack<FilePath> pending_paths_;
+
+  DISALLOW_COPY_AND_ASSIGN(FileEnumerator);
+};
+
+}  // namespace base
+
+#endif  // BASE_FILES_FILE_ENUMERATOR_H_