The Tor Browser: ipc/chromium/src/base/file_path.cc@6474c204b198 (annotated)

ipc/chromium/src/base/file_path.cc@6474c204b198 (annotated)

ipc/chromium/src/base/file_path.cc

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 // Copyright (c) 2008 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 <fstream>
 #include "base/file_path.h"
 #include "base/logging.h"
 // These includes are just for the *Hack functions, and should be removed
 // when those functions are removed.
 #include "base/string_piece.h"
 #include "base/string_util.h"
 #include "base/sys_string_conversions.h"
 #if defined(FILE_PATH_USES_WIN_SEPARATORS)
 const FilePath::CharType FilePath::kSeparators[] = FILE_PATH_LITERAL("\\/");
 #else  // FILE_PATH_USES_WIN_SEPARATORS
 const FilePath::CharType FilePath::kSeparators[] = FILE_PATH_LITERAL("/");
 #endif  // FILE_PATH_USES_WIN_SEPARATORS
 const FilePath::CharType FilePath::kCurrentDirectory[] = FILE_PATH_LITERAL(".");
 const FilePath::CharType FilePath::kParentDirectory[] = FILE_PATH_LITERAL("..");
 const FilePath::CharType FilePath::kExtensionSeparator = FILE_PATH_LITERAL('.');
 namespace {
 // If this FilePath contains a drive letter specification, returns the
 // position of the last character of the drive letter specification,
 // otherwise returns npos.  This can only be true on Windows, when a pathname
 // begins with a letter followed by a colon.  On other platforms, this always
 // returns npos.
 FilePath::StringType::size_type FindDriveLetter(
     const FilePath::StringType& path) {
 #if defined(FILE_PATH_USES_DRIVE_LETTERS)
   // This is dependent on an ASCII-based character set, but that's a
   // reasonable assumption.  iswalpha can be too inclusive here.
   if (path.length() >= 2 && path[1] == L':' &&
       ((path[0] >= L'A' && path[0] <= L'Z') ||
        (path[0] >= L'a' && path[0] <= L'z'))) {
     return 1;
   }
 #endif  // FILE_PATH_USES_DRIVE_LETTERS
   return FilePath::StringType::npos;
 }
 bool IsPathAbsolute(const FilePath::StringType& path) {
 #if defined(FILE_PATH_USES_DRIVE_LETTERS)
   FilePath::StringType::size_type letter = FindDriveLetter(path);
   if (letter != FilePath::StringType::npos) {
     // Look for a separator right after the drive specification.
     return path.length() > letter + 1 &&
         FilePath::IsSeparator(path[letter + 1]);
   }
   // Look for a pair of leading separators.
   return path.length() > 1 &&
       FilePath::IsSeparator(path[0]) && FilePath::IsSeparator(path[1]);
 #else  // FILE_PATH_USES_DRIVE_LETTERS
   // Look for a separator in the first position.
   return path.length() > 0 && FilePath::IsSeparator(path[0]);
 #endif  // FILE_PATH_USES_DRIVE_LETTERS
 }
 }  // namespace
 bool FilePath::IsSeparator(CharType character) {
   for (size_t i = 0; i < arraysize(kSeparators) - 1; ++i) {
     if (character == kSeparators[i]) {
       return true;
     }
   }
   return false;
 }
 // libgen's dirname and basename aren't guaranteed to be thread-safe and aren't
 // guaranteed to not modify their input strings, and in fact are implemented
 // differently in this regard on different platforms.  Don't use them, but
 // adhere to their behavior.
 FilePath FilePath::DirName() const {
   FilePath new_path(path_);
   new_path.StripTrailingSeparatorsInternal();
   // The drive letter, if any, always needs to remain in the output.  If there
   // is no drive letter, as will always be the case on platforms which do not
   // support drive letters, letter will be npos, or -1, so the comparisons and
   // resizes below using letter will still be valid.
   StringType::size_type letter = FindDriveLetter(new_path.path_);
   StringType::size_type last_separator =
       new_path.path_.find_last_of(kSeparators, StringType::npos,
                                   arraysize(kSeparators) - 1);
   if (last_separator == StringType::npos) {
     // path_ is in the current directory.
     new_path.path_.resize(letter + 1);
   } else if (last_separator == letter + 1) {
     // path_ is in the root directory.
     new_path.path_.resize(letter + 2);
   } else if (last_separator == letter + 2 &&
              IsSeparator(new_path.path_[letter + 1])) {
     // path_ is in "//" (possibly with a drive letter); leave the double
     // separator intact indicating alternate root.
     new_path.path_.resize(letter + 3);
   } else if (last_separator != 0) {
     // path_ is somewhere else, trim the basename.
     new_path.path_.resize(last_separator);
   }
   new_path.StripTrailingSeparatorsInternal();
   if (!new_path.path_.length())
     new_path.path_ = kCurrentDirectory;
   return new_path;
 }
 FilePath FilePath::BaseName() const {
   FilePath new_path(path_);
   new_path.StripTrailingSeparatorsInternal();
   // The drive letter, if any, is always stripped.
   StringType::size_type letter = FindDriveLetter(new_path.path_);
   if (letter != StringType::npos) {
     new_path.path_.erase(0, letter + 1);
   }
   // Keep everything after the final separator, but if the pathname is only
   // one character and it's a separator, leave it alone.
   StringType::size_type last_separator =
       new_path.path_.find_last_of(kSeparators, StringType::npos,
                                   arraysize(kSeparators) - 1);
   if (last_separator != StringType::npos &&
       last_separator < new_path.path_.length() - 1) {
     new_path.path_.erase(0, last_separator + 1);
   }
   return new_path;
 }
 FilePath::StringType FilePath::Extension() const {
   // BaseName() calls StripTrailingSeparators, so cases like /foo.baz/// work.
   StringType base = BaseName().value();
   // Special case "." and ".."
   if (base == kCurrentDirectory || base == kParentDirectory)
     return StringType();
   const StringType::size_type last_dot = base.rfind(kExtensionSeparator);
   if (last_dot == StringType::npos)
     return StringType();
   return StringType(base, last_dot);
 }
 FilePath FilePath::RemoveExtension() const {
   StringType ext = Extension();
   // It's important to check Extension() since that verifies that the
   // kExtensionSeparator actually appeared in the last path component.
   if (ext.empty())
     return FilePath(path_);
   // Since Extension() verified that the extension is in fact in the last path
   // component, this substr will effectively strip trailing separators.
   const StringType::size_type last_dot = path_.rfind(kExtensionSeparator);
   return FilePath(path_.substr(0, last_dot));
 }
 FilePath FilePath::InsertBeforeExtension(const StringType& suffix) const {
   if (suffix.empty())
     return FilePath(path_);
   if (path_.empty())
     return FilePath();
   StringType base = BaseName().value();
   if (base.empty())
     return FilePath();
   if (*(base.end() - 1) == kExtensionSeparator) {
     // Special case "." and ".."
     if (base == kCurrentDirectory || base == kParentDirectory) {
       return FilePath();
     }
   }
   StringType ext = Extension();
   StringType ret = RemoveExtension().value();
   ret.append(suffix);
   ret.append(ext);
   return FilePath(ret);
 }
 FilePath FilePath::ReplaceExtension(const StringType& extension) const {
   if (path_.empty())
     return FilePath();
   StringType base = BaseName().value();
   if (base.empty())
     return FilePath();
   if (*(base.end() - 1) == kExtensionSeparator) {
     // Special case "." and ".."
     if (base == kCurrentDirectory || base == kParentDirectory) {
       return FilePath();
     }
   }
   FilePath no_ext = RemoveExtension();
   // If the new extension is "" or ".", then just remove the current extension.
   if (extension.empty() || extension == StringType(1, kExtensionSeparator))
     return no_ext;
   StringType str = no_ext.value();
   if (extension[0] != kExtensionSeparator)
     str.append(1, kExtensionSeparator);
   str.append(extension);
   return FilePath(str);
 }
 FilePath FilePath::Append(const StringType& component) const {
   DCHECK(!IsPathAbsolute(component));
   if (path_.compare(kCurrentDirectory) == 0) {
     // Append normally doesn't do any normalization, but as a special case,
     // when appending to kCurrentDirectory, just return a new path for the
     // component argument.  Appending component to kCurrentDirectory would
     // serve no purpose other than needlessly lengthening the path, and
     // it's likely in practice to wind up with FilePath objects containing
     // only kCurrentDirectory when calling DirName on a single relative path
     // component.
     return FilePath(component);
   }
   FilePath new_path(path_);
   new_path.StripTrailingSeparatorsInternal();
   // Don't append a separator if the path is empty (indicating the current
   // directory) or if the path component is empty (indicating nothing to
   // append).
   if (component.length() > 0 && new_path.path_.length() > 0) {
     // Don't append a separator if the path still ends with a trailing
     // separator after stripping (indicating the root directory).
     if (!IsSeparator(new_path.path_[new_path.path_.length() - 1])) {
       // Don't append a separator if the path is just a drive letter.
       if (FindDriveLetter(new_path.path_) + 1 != new_path.path_.length()) {
         new_path.path_.append(1, kSeparators[0]);
       }
     }
   }
   new_path.path_.append(component);
   return new_path;
 }
 FilePath FilePath::Append(const FilePath& component) const {
   return Append(component.value());
 }
 FilePath FilePath::AppendASCII(const std::string& component) const {
   DCHECK(IsStringASCII(component));
 #if defined(OS_WIN)
   return Append(ASCIIToWide(component));
 #elif defined(OS_POSIX)
   return Append(component);
 #endif
 }
 bool FilePath::IsAbsolute() const {
   return IsPathAbsolute(path_);
 }
 #if defined(OS_POSIX)
 // See file_path.h for a discussion of the encoding of paths on POSIX
 // platforms.  These *Hack() functions are not quite correct, but they're
 // only temporary while we fix the remainder of the code.
 // Remember to remove the #includes at the top when you remove these.
 // static
 FilePath FilePath::FromWStringHack(const std::wstring& wstring) {
   return FilePath(base::SysWideToNativeMB(wstring));
 }
 std::wstring FilePath::ToWStringHack() const {
   return base::SysNativeMBToWide(path_);
 }
 #elif defined(OS_WIN)
 // static
 FilePath FilePath::FromWStringHack(const std::wstring& wstring) {
   return FilePath(wstring);
 }
 std::wstring FilePath::ToWStringHack() const {
   return path_;
 }
 #endif
 void FilePath::OpenInputStream(std::ifstream& stream) const {
   stream.open(
 #ifndef __MINGW32__
               path_.c_str(),
 #else
               base::SysWideToNativeMB(path_).c_str(),
 #endif
               std::ios::in | std::ios::binary);
 }
 FilePath FilePath::StripTrailingSeparators() const {
   FilePath new_path(path_);
   new_path.StripTrailingSeparatorsInternal();
   return new_path;
 }
 void FilePath::StripTrailingSeparatorsInternal() {
   // If there is no drive letter, start will be 1, which will prevent stripping
   // the leading separator if there is only one separator.  If there is a drive
   // letter, start will be set appropriately to prevent stripping the first
   // separator following the drive letter, if a separator immediately follows
   // the drive letter.
   StringType::size_type start = FindDriveLetter(path_) + 2;
   StringType::size_type last_stripped = StringType::npos;
   for (StringType::size_type pos = path_.length();
        pos > start && IsSeparator(path_[pos - 1]);
        --pos) {
     // If the string only has two separators and they're at the beginning,
     // don't strip them, unless the string began with more than two separators.
     if (pos != start + 1 || last_stripped == start + 2 ||
         !IsSeparator(path_[start - 1])) {
       path_.resize(pos - 1);
       last_stripped = pos;
     }
   }
 }

The Tor Browser / annotate

ipc/chromium/src/base/file_path.cc@6474c204b198 (annotated)

ipc/chromium/src/base/file_path.cc