You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
482 lines
21 KiB
482 lines
21 KiB
// 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.
|
|
|
|
// FilePath is a container for pathnames stored in a platform's native string
|
|
// type, providing containers for manipulation in according with the
|
|
// platform's conventions for pathnames. It supports the following path
|
|
// types:
|
|
//
|
|
// POSIX Windows
|
|
// --------------- ----------------------------------
|
|
// Fundamental type char[] wchar_t[]
|
|
// Encoding unspecified* UTF-16
|
|
// Separator / \, tolerant of /
|
|
// Drive letters no case-insensitive A-Z followed by :
|
|
// Alternate root // (surprise!) \\, for UNC paths
|
|
//
|
|
// * The encoding need not be specified on POSIX systems, although some
|
|
// POSIX-compliant systems do specify an encoding. Mac OS X uses UTF-8.
|
|
// Chrome OS also uses UTF-8.
|
|
// Linux does not specify an encoding, but in practice, the locale's
|
|
// character set may be used.
|
|
//
|
|
// For more arcane bits of path trivia, see below.
|
|
//
|
|
// FilePath objects are intended to be used anywhere paths are. An
|
|
// application may pass FilePath objects around internally, masking the
|
|
// underlying differences between systems, only differing in implementation
|
|
// where interfacing directly with the system. For example, a single
|
|
// OpenFile(const FilePath &) function may be made available, allowing all
|
|
// callers to operate without regard to the underlying implementation. On
|
|
// POSIX-like platforms, OpenFile might wrap fopen, and on Windows, it might
|
|
// wrap _wfopen_s, perhaps both by calling file_path.value().c_str(). This
|
|
// allows each platform to pass pathnames around without requiring conversions
|
|
// between encodings, which has an impact on performance, but more imporantly,
|
|
// has an impact on correctness on platforms that do not have well-defined
|
|
// encodings for pathnames.
|
|
//
|
|
// Several methods are available to perform common operations on a FilePath
|
|
// object, such as determining the parent directory (DirName), isolating the
|
|
// final path component (BaseName), and appending a relative pathname string
|
|
// to an existing FilePath object (Append). These methods are highly
|
|
// recommended over attempting to split and concatenate strings directly.
|
|
// These methods are based purely on string manipulation and knowledge of
|
|
// platform-specific pathname conventions, and do not consult the filesystem
|
|
// at all, making them safe to use without fear of blocking on I/O operations.
|
|
// These methods do not function as mutators but instead return distinct
|
|
// instances of FilePath objects, and are therefore safe to use on const
|
|
// objects. The objects themselves are safe to share between threads.
|
|
//
|
|
// To aid in initialization of FilePath objects from string literals, a
|
|
// FILE_PATH_LITERAL macro is provided, which accounts for the difference
|
|
// between char[]-based pathnames on POSIX systems and wchar_t[]-based
|
|
// pathnames on Windows.
|
|
//
|
|
// As a precaution against premature truncation, paths can't contain NULs.
|
|
//
|
|
// Because a FilePath object should not be instantiated at the global scope,
|
|
// instead, use a FilePath::CharType[] and initialize it with
|
|
// FILE_PATH_LITERAL. At runtime, a FilePath object can be created from the
|
|
// character array. Example:
|
|
//
|
|
// | const FilePath::CharType kLogFileName[] = FILE_PATH_LITERAL("log.txt");
|
|
// |
|
|
// | void Function() {
|
|
// | FilePath log_file_path(kLogFileName);
|
|
// | [...]
|
|
// | }
|
|
//
|
|
// WARNING: FilePaths should ALWAYS be displayed with LTR directionality, even
|
|
// when the UI language is RTL. This means you always need to pass filepaths
|
|
// through base::i18n::WrapPathWithLTRFormatting() before displaying it in the
|
|
// RTL UI.
|
|
//
|
|
// This is a very common source of bugs, please try to keep this in mind.
|
|
//
|
|
// ARCANE BITS OF PATH TRIVIA
|
|
//
|
|
// - A double leading slash is actually part of the POSIX standard. Systems
|
|
// are allowed to treat // as an alternate root, as Windows does for UNC
|
|
// (network share) paths. Most POSIX systems don't do anything special
|
|
// with two leading slashes, but FilePath handles this case properly
|
|
// in case it ever comes across such a system. FilePath needs this support
|
|
// for Windows UNC paths, anyway.
|
|
// References:
|
|
// The Open Group Base Specifications Issue 7, sections 3.267 ("Pathname")
|
|
// and 4.12 ("Pathname Resolution"), available at:
|
|
// http://www.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_267
|
|
// http://www.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap04.html#tag_04_12
|
|
//
|
|
// - Windows treats c:\\ the same way it treats \\. This was intended to
|
|
// allow older applications that require drive letters to support UNC paths
|
|
// like \\server\share\path, by permitting c:\\server\share\path as an
|
|
// equivalent. Since the OS treats these paths specially, FilePath needs
|
|
// to do the same. Since Windows can use either / or \ as the separator,
|
|
// FilePath treats c://, c:\\, //, and \\ all equivalently.
|
|
// Reference:
|
|
// The Old New Thing, "Why is a drive letter permitted in front of UNC
|
|
// paths (sometimes)?", available at:
|
|
// http://blogs.msdn.com/oldnewthing/archive/2005/11/22/495740.aspx
|
|
|
|
#ifndef BASE_FILES_FILE_PATH_H_
|
|
#define BASE_FILES_FILE_PATH_H_
|
|
|
|
#include <stddef.h>
|
|
|
|
#include <iosfwd>
|
|
#include <string>
|
|
#include <vector>
|
|
|
|
#include "base/base_export.h"
|
|
#include "base/compiler_specific.h"
|
|
#include "base/macros.h"
|
|
#include "base/strings/string16.h"
|
|
#include "base/strings/string_piece.h"
|
|
#include "build/build_config.h"
|
|
|
|
// Windows-style drive letter support and pathname separator characters can be
|
|
// enabled and disabled independently, to aid testing. These #defines are
|
|
// here so that the same setting can be used in both the implementation and
|
|
// in the unit test.
|
|
#if defined(OS_WIN)
|
|
#define FILE_PATH_USES_DRIVE_LETTERS
|
|
#define FILE_PATH_USES_WIN_SEPARATORS
|
|
#endif // OS_WIN
|
|
|
|
// To print path names portably use PRIsFP (based on PRIuS and friends from
|
|
// C99 and format_macros.h) like this:
|
|
// base::StringPrintf("Path is %" PRIsFP ".\n", path.value().c_str());
|
|
#if defined(OS_WIN)
|
|
#define PRIsFP "ls"
|
|
#elif defined(OS_POSIX) || defined(OS_FUCHSIA)
|
|
#define PRIsFP "s"
|
|
#endif // OS_WIN
|
|
|
|
namespace base {
|
|
|
|
class Pickle;
|
|
class PickleIterator;
|
|
|
|
// An abstraction to isolate users from the differences between native
|
|
// pathnames on different platforms.
|
|
class BASE_EXPORT FilePath {
|
|
public:
|
|
#if defined(OS_WIN)
|
|
// On Windows, for Unicode-aware applications, native pathnames are wchar_t
|
|
// arrays encoded in UTF-16.
|
|
typedef std::wstring StringType;
|
|
#elif defined(OS_POSIX) || defined(OS_FUCHSIA)
|
|
// On most platforms, native pathnames are char arrays, and the encoding
|
|
// may or may not be specified. On Mac OS X, native pathnames are encoded
|
|
// in UTF-8.
|
|
typedef std::string StringType;
|
|
#endif // OS_WIN
|
|
|
|
typedef BasicStringPiece<StringType> StringPieceType;
|
|
typedef StringType::value_type CharType;
|
|
|
|
// Null-terminated array of separators used to separate components in
|
|
// hierarchical paths. Each character in this array is a valid separator,
|
|
// but kSeparators[0] is treated as the canonical separator and will be used
|
|
// when composing pathnames.
|
|
static const CharType kSeparators[];
|
|
|
|
// arraysize(kSeparators).
|
|
static const size_t kSeparatorsLength;
|
|
|
|
// A special path component meaning "this directory."
|
|
static const CharType kCurrentDirectory[];
|
|
|
|
// A special path component meaning "the parent directory."
|
|
static const CharType kParentDirectory[];
|
|
|
|
// The character used to identify a file extension.
|
|
static const CharType kExtensionSeparator;
|
|
|
|
FilePath();
|
|
FilePath(const FilePath& that);
|
|
explicit FilePath(StringPieceType path);
|
|
~FilePath();
|
|
FilePath& operator=(const FilePath& that);
|
|
|
|
// Constructs FilePath with the contents of |that|, which is left in valid but
|
|
// unspecified state.
|
|
FilePath(FilePath&& that) noexcept;
|
|
// Replaces the contents with those of |that|, which is left in valid but
|
|
// unspecified state.
|
|
FilePath& operator=(FilePath&& that);
|
|
|
|
bool operator==(const FilePath& that) const;
|
|
|
|
bool operator!=(const FilePath& that) const;
|
|
|
|
// Required for some STL containers and operations
|
|
bool operator<(const FilePath& that) const {
|
|
return path_ < that.path_;
|
|
}
|
|
|
|
const StringType& value() const { return path_; }
|
|
|
|
bool empty() const { return path_.empty(); }
|
|
|
|
void clear() { path_.clear(); }
|
|
|
|
// Returns true if |character| is in kSeparators.
|
|
static bool IsSeparator(CharType character);
|
|
|
|
// Returns a vector of all of the components of the provided path. It is
|
|
// equivalent to calling DirName().value() on the path's root component,
|
|
// and BaseName().value() on each child component.
|
|
//
|
|
// To make sure this is lossless so we can differentiate absolute and
|
|
// relative paths, the root slash will be included even though no other
|
|
// slashes will be. The precise behavior is:
|
|
//
|
|
// Posix: "/foo/bar" -> [ "/", "foo", "bar" ]
|
|
// Windows: "C:\foo\bar" -> [ "C:", "\\", "foo", "bar" ]
|
|
void GetComponents(std::vector<FilePath::StringType>* components) const;
|
|
|
|
// Returns true if this FilePath is a strict parent of the |child|. Absolute
|
|
// and relative paths are accepted i.e. is /foo parent to /foo/bar and
|
|
// is foo parent to foo/bar. Does not convert paths to absolute, follow
|
|
// symlinks or directory navigation (e.g. ".."). A path is *NOT* its own
|
|
// parent.
|
|
bool IsParent(const FilePath& child) const;
|
|
|
|
// If IsParent(child) holds, appends to path (if non-NULL) the
|
|
// relative path to child and returns true. For example, if parent
|
|
// holds "/Users/johndoe/Library/Application Support", child holds
|
|
// "/Users/johndoe/Library/Application Support/Google/Chrome/Default", and
|
|
// *path holds "/Users/johndoe/Library/Caches", then after
|
|
// parent.AppendRelativePath(child, path) is called *path will hold
|
|
// "/Users/johndoe/Library/Caches/Google/Chrome/Default". Otherwise,
|
|
// returns false.
|
|
bool AppendRelativePath(const FilePath& child, FilePath* path) const;
|
|
|
|
// Returns a FilePath corresponding to the directory containing the path
|
|
// named by this object, stripping away the file component. If this object
|
|
// only contains one component, returns a FilePath identifying
|
|
// kCurrentDirectory. If this object already refers to the root directory,
|
|
// returns a FilePath identifying the root directory. Please note that this
|
|
// doesn't resolve directory navigation, e.g. the result for "../a" is "..".
|
|
FilePath DirName() const WARN_UNUSED_RESULT;
|
|
|
|
// Returns a FilePath corresponding to the last path component of this
|
|
// object, either a file or a directory. If this object already refers to
|
|
// the root directory, returns a FilePath identifying the root directory;
|
|
// this is the only situation in which BaseName will return an absolute path.
|
|
FilePath BaseName() const WARN_UNUSED_RESULT;
|
|
|
|
// Returns ".jpg" for path "C:\pics\jojo.jpg", or an empty string if
|
|
// the file has no extension. If non-empty, Extension() will always start
|
|
// with precisely one ".". The following code should always work regardless
|
|
// of the value of path. For common double-extensions like .tar.gz and
|
|
// .user.js, this method returns the combined extension. For a single
|
|
// component, use FinalExtension().
|
|
// new_path = path.RemoveExtension().value().append(path.Extension());
|
|
// ASSERT(new_path == path.value());
|
|
// NOTE: this is different from the original file_util implementation which
|
|
// returned the extension without a leading "." ("jpg" instead of ".jpg")
|
|
StringType Extension() const WARN_UNUSED_RESULT;
|
|
|
|
// Returns the path's file extension, as in Extension(), but will
|
|
// never return a double extension.
|
|
//
|
|
// TODO(davidben): Check all our extension-sensitive code to see if
|
|
// we can rename this to Extension() and the other to something like
|
|
// LongExtension(), defaulting to short extensions and leaving the
|
|
// long "extensions" to logic like base::GetUniquePathNumber().
|
|
StringType FinalExtension() const WARN_UNUSED_RESULT;
|
|
|
|
// Returns "C:\pics\jojo" for path "C:\pics\jojo.jpg"
|
|
// NOTE: this is slightly different from the similar file_util implementation
|
|
// which returned simply 'jojo'.
|
|
FilePath RemoveExtension() const WARN_UNUSED_RESULT;
|
|
|
|
// Removes the path's file extension, as in RemoveExtension(), but
|
|
// ignores double extensions.
|
|
FilePath RemoveFinalExtension() const WARN_UNUSED_RESULT;
|
|
|
|
// Inserts |suffix| after the file name portion of |path| but before the
|
|
// extension. Returns "" if BaseName() == "." or "..".
|
|
// Examples:
|
|
// path == "C:\pics\jojo.jpg" suffix == " (1)", returns "C:\pics\jojo (1).jpg"
|
|
// path == "jojo.jpg" suffix == " (1)", returns "jojo (1).jpg"
|
|
// path == "C:\pics\jojo" suffix == " (1)", returns "C:\pics\jojo (1)"
|
|
// path == "C:\pics.old\jojo" suffix == " (1)", returns "C:\pics.old\jojo (1)"
|
|
FilePath InsertBeforeExtension(
|
|
StringPieceType suffix) const WARN_UNUSED_RESULT;
|
|
FilePath InsertBeforeExtensionASCII(
|
|
StringPiece suffix) const WARN_UNUSED_RESULT;
|
|
|
|
// Adds |extension| to |file_name|. Returns the current FilePath if
|
|
// |extension| is empty. Returns "" if BaseName() == "." or "..".
|
|
FilePath AddExtension(StringPieceType extension) const WARN_UNUSED_RESULT;
|
|
|
|
// Replaces the extension of |file_name| with |extension|. If |file_name|
|
|
// does not have an extension, then |extension| is added. If |extension| is
|
|
// empty, then the extension is removed from |file_name|.
|
|
// Returns "" if BaseName() == "." or "..".
|
|
FilePath ReplaceExtension(StringPieceType extension) const WARN_UNUSED_RESULT;
|
|
|
|
// Returns true if the file path matches the specified extension. The test is
|
|
// case insensitive. Don't forget the leading period if appropriate.
|
|
bool MatchesExtension(StringPieceType extension) const;
|
|
|
|
// Returns a FilePath by appending a separator and the supplied path
|
|
// component to this object's path. Append takes care to avoid adding
|
|
// excessive separators if this object's path already ends with a separator.
|
|
// If this object's path is kCurrentDirectory, a new FilePath corresponding
|
|
// only to |component| is returned. |component| must be a relative path;
|
|
// it is an error to pass an absolute path.
|
|
FilePath Append(StringPieceType component) const WARN_UNUSED_RESULT;
|
|
FilePath Append(const FilePath& component) const WARN_UNUSED_RESULT;
|
|
|
|
// Although Windows StringType is std::wstring, since the encoding it uses for
|
|
// paths is well defined, it can handle ASCII path components as well.
|
|
// Mac uses UTF8, and since ASCII is a subset of that, it works there as well.
|
|
// On Linux, although it can use any 8-bit encoding for paths, we assume that
|
|
// ASCII is a valid subset, regardless of the encoding, since many operating
|
|
// system paths will always be ASCII.
|
|
FilePath AppendASCII(StringPiece component) const WARN_UNUSED_RESULT;
|
|
|
|
// Returns true if this FilePath contains an absolute path. On Windows, an
|
|
// absolute path begins with either a drive letter specification followed by
|
|
// a separator character, or with two separator characters. On POSIX
|
|
// platforms, an absolute path begins with a separator character.
|
|
bool IsAbsolute() const;
|
|
|
|
// Returns true if the patch ends with a path separator character.
|
|
bool EndsWithSeparator() const WARN_UNUSED_RESULT;
|
|
|
|
// Returns a copy of this FilePath that ends with a trailing separator. If
|
|
// the input path is empty, an empty FilePath will be returned.
|
|
FilePath AsEndingWithSeparator() const WARN_UNUSED_RESULT;
|
|
|
|
// Returns a copy of this FilePath that does not end with a trailing
|
|
// separator.
|
|
FilePath StripTrailingSeparators() const WARN_UNUSED_RESULT;
|
|
|
|
// Returns true if this FilePath contains an attempt to reference a parent
|
|
// directory (e.g. has a path component that is "..").
|
|
bool ReferencesParent() const;
|
|
|
|
// Return a Unicode human-readable version of this path.
|
|
// Warning: you can *not*, in general, go from a display name back to a real
|
|
// path. Only use this when displaying paths to users, not just when you
|
|
// want to stuff a string16 into some other API.
|
|
string16 LossyDisplayName() const;
|
|
|
|
// Return the path as ASCII, or the empty string if the path is not ASCII.
|
|
// This should only be used for cases where the FilePath is representing a
|
|
// known-ASCII filename.
|
|
std::string MaybeAsASCII() const;
|
|
|
|
// Return the path as UTF-8.
|
|
//
|
|
// This function is *unsafe* as there is no way to tell what encoding is
|
|
// used in file names on POSIX systems other than Mac and Chrome OS,
|
|
// although UTF-8 is practically used everywhere these days. To mitigate
|
|
// the encoding issue, this function internally calls
|
|
// SysNativeMBToWide() on POSIX systems other than Mac and Chrome OS,
|
|
// per assumption that the current locale's encoding is used in file
|
|
// names, but this isn't a perfect solution.
|
|
//
|
|
// Once it becomes safe to to stop caring about non-UTF-8 file names,
|
|
// the SysNativeMBToWide() hack will be removed from the code, along
|
|
// with "Unsafe" in the function name.
|
|
std::string AsUTF8Unsafe() const;
|
|
|
|
// Similar to AsUTF8Unsafe, but returns UTF-16 instead.
|
|
string16 AsUTF16Unsafe() const;
|
|
|
|
// Returns a FilePath object from a path name in UTF-8. This function
|
|
// should only be used for cases where you are sure that the input
|
|
// string is UTF-8.
|
|
//
|
|
// Like AsUTF8Unsafe(), this function is unsafe. This function
|
|
// internally calls SysWideToNativeMB() on POSIX systems other than Mac
|
|
// and Chrome OS, to mitigate the encoding issue. See the comment at
|
|
// AsUTF8Unsafe() for details.
|
|
static FilePath FromUTF8Unsafe(StringPiece utf8);
|
|
|
|
// Similar to FromUTF8Unsafe, but accepts UTF-16 instead.
|
|
static FilePath FromUTF16Unsafe(StringPiece16 utf16);
|
|
|
|
void WriteToPickle(Pickle* pickle) const;
|
|
bool ReadFromPickle(PickleIterator* iter);
|
|
|
|
// Normalize all path separators to backslash on Windows
|
|
// (if FILE_PATH_USES_WIN_SEPARATORS is true), or do nothing on POSIX systems.
|
|
FilePath NormalizePathSeparators() const;
|
|
|
|
// Normalize all path separattors to given type on Windows
|
|
// (if FILE_PATH_USES_WIN_SEPARATORS is true), or do nothing on POSIX systems.
|
|
FilePath NormalizePathSeparatorsTo(CharType separator) const;
|
|
|
|
// Compare two strings in the same way the file system does.
|
|
// Note that these always ignore case, even on file systems that are case-
|
|
// sensitive. If case-sensitive comparison is ever needed, add corresponding
|
|
// methods here.
|
|
// The methods are written as a static method so that they can also be used
|
|
// on parts of a file path, e.g., just the extension.
|
|
// CompareIgnoreCase() returns -1, 0 or 1 for less-than, equal-to and
|
|
// greater-than respectively.
|
|
static int CompareIgnoreCase(StringPieceType string1,
|
|
StringPieceType string2);
|
|
static bool CompareEqualIgnoreCase(StringPieceType string1,
|
|
StringPieceType string2) {
|
|
return CompareIgnoreCase(string1, string2) == 0;
|
|
}
|
|
static bool CompareLessIgnoreCase(StringPieceType string1,
|
|
StringPieceType string2) {
|
|
return CompareIgnoreCase(string1, string2) < 0;
|
|
}
|
|
|
|
#if defined(OS_MACOSX)
|
|
// Returns the string in the special canonical decomposed form as defined for
|
|
// HFS, which is close to, but not quite, decomposition form D. See
|
|
// http://developer.apple.com/mac/library/technotes/tn/tn1150.html#UnicodeSubtleties
|
|
// for further comments.
|
|
// Returns the epmty string if the conversion failed.
|
|
static StringType GetHFSDecomposedForm(StringPieceType string);
|
|
|
|
// Special UTF-8 version of FastUnicodeCompare. Cf:
|
|
// http://developer.apple.com/mac/library/technotes/tn/tn1150.html#StringComparisonAlgorithm
|
|
// IMPORTANT: The input strings must be in the special HFS decomposed form!
|
|
// (cf. above GetHFSDecomposedForm method)
|
|
static int HFSFastUnicodeCompare(StringPieceType string1,
|
|
StringPieceType string2);
|
|
#endif
|
|
|
|
#if defined(OS_ANDROID)
|
|
// On android, file selection dialog can return a file with content uri
|
|
// scheme(starting with content://). Content uri needs to be opened with
|
|
// ContentResolver to guarantee that the app has appropriate permissions
|
|
// to access it.
|
|
// Returns true if the path is a content uri, or false otherwise.
|
|
bool IsContentUri() const;
|
|
#endif
|
|
|
|
private:
|
|
// Remove trailing separators from this object. If the path is absolute, it
|
|
// will never be stripped any more than to refer to the absolute root
|
|
// directory, so "////" will become "/", not "". A leading pair of
|
|
// separators is never stripped, to support alternate roots. This is used to
|
|
// support UNC paths on Windows.
|
|
void StripTrailingSeparatorsInternal();
|
|
|
|
StringType path_;
|
|
};
|
|
|
|
BASE_EXPORT std::ostream& operator<<(std::ostream& out,
|
|
const FilePath& file_path);
|
|
|
|
} // namespace base
|
|
|
|
// Macros for string literal initialization of FilePath::CharType[], and for
|
|
// using a FilePath::CharType[] in a printf-style format string.
|
|
#if defined(OS_WIN)
|
|
#define FILE_PATH_LITERAL(x) L ## x
|
|
#define PRFilePath "ls"
|
|
#elif defined(OS_POSIX) || defined(OS_FUCHSIA)
|
|
#define FILE_PATH_LITERAL(x) x
|
|
#define PRFilePath "s"
|
|
#endif // OS_WIN
|
|
|
|
namespace std {
|
|
|
|
template <>
|
|
struct hash<base::FilePath> {
|
|
typedef base::FilePath argument_type;
|
|
typedef std::size_t result_type;
|
|
result_type operator()(argument_type const& f) const {
|
|
return hash<base::FilePath::StringType>()(f.value());
|
|
}
|
|
};
|
|
|
|
} // namespace std
|
|
|
|
#endif // BASE_FILES_FILE_PATH_H_
|