// 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/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 BASE_EXPORT 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)
// Note that the cAlternateFileName (used to hold the "short" 8.3 name)
// of the WIN32_FIND_DATA will be empty. Since we don't use short file
// names, we tell Windows to omit it which speeds up the query slightly.
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_