The Tor Browser: security/sandbox/chromium/base/file

security/sandbox/chromium/base/file_util.cc@141e0f1194b1 (annotated)

security/sandbox/chromium/base/file_util.cc

Wed, 31 Dec 2014 07:16:47 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 07:16:47 +0100
branch: TOR_BUG_9701
changeset 3: 141e0f1194b1
permissions: -rw-r--r--

Revert simplistic fix pending revisit of Mozilla integration attempt.

 // 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.
 #include "base/file_util.h"
 #if defined(OS_WIN)
 #include <io.h>
 #endif
 #include <stdio.h>
 #include <fstream>
 #include "base/files/file_enumerator.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 namespace base {
 namespace {
 const FilePath::CharType kExtensionSeparator = FILE_PATH_LITERAL('.');
 // The maximum number of 'uniquified' files we will try to create.
 // This is used when the filename we're trying to download is already in use,
 // so we create a new unique filename by appending " (nnn)" before the
 // extension, where 1 <= nnn <= kMaxUniqueFiles.
 // Also used by code that cleans up said files.
 static const int kMaxUniqueFiles = 100;
 }  // namespace
 bool g_bug108724_debug = false;
 int64 ComputeDirectorySize(const FilePath& root_path) {
   int64 running_size = 0;
   FileEnumerator file_iter(root_path, true, FileEnumerator::FILES);
   while (!file_iter.Next().empty())
     running_size += file_iter.GetInfo().GetSize();
   return running_size;
 }
 bool Move(const FilePath& from_path, const FilePath& to_path) {
   if (from_path.ReferencesParent() || to_path.ReferencesParent())
     return false;
   return internal::MoveUnsafe(from_path, to_path);
 }
 bool CopyFile(const FilePath& from_path, const FilePath& to_path) {
   if (from_path.ReferencesParent() || to_path.ReferencesParent())
     return false;
   return internal::CopyFileUnsafe(from_path, to_path);
 }
 bool ContentsEqual(const FilePath& filename1, const FilePath& filename2) {
   // We open the file in binary format even if they are text files because
   // we are just comparing that bytes are exactly same in both files and not
   // doing anything smart with text formatting.
   std::ifstream file1(filename1.value().c_str(),
                       std::ios::in | std::ios::binary);
   std::ifstream file2(filename2.value().c_str(),
                       std::ios::in | std::ios::binary);
   // Even if both files aren't openable (and thus, in some sense, "equal"),
   // any unusable file yields a result of "false".
   if (!file1.is_open() || !file2.is_open())
     return false;
   const int BUFFER_SIZE = 2056;
   char buffer1[BUFFER_SIZE], buffer2[BUFFER_SIZE];
   do {
     file1.read(buffer1, BUFFER_SIZE);
     file2.read(buffer2, BUFFER_SIZE);
     if ((file1.eof() != file2.eof()) ||
         (file1.gcount() != file2.gcount()) ||
         (memcmp(buffer1, buffer2, file1.gcount()))) {
       file1.close();
       file2.close();
       return false;
     }
   } while (!file1.eof() || !file2.eof());
   file1.close();
   file2.close();
   return true;
 }
 bool TextContentsEqual(const FilePath& filename1, const FilePath& filename2) {
   std::ifstream file1(filename1.value().c_str(), std::ios::in);
   std::ifstream file2(filename2.value().c_str(), std::ios::in);
   // Even if both files aren't openable (and thus, in some sense, "equal"),
   // any unusable file yields a result of "false".
   if (!file1.is_open() || !file2.is_open())
     return false;
   do {
     std::string line1, line2;
     getline(file1, line1);
     getline(file2, line2);
     // Check for mismatched EOF states, or any error state.
     if ((file1.eof() != file2.eof()) ||
         file1.bad() || file2.bad()) {
       return false;
     }
     // Trim all '\r' and '\n' characters from the end of the line.
     std::string::size_type end1 = line1.find_last_not_of("\r\n");
     if (end1 == std::string::npos)
       line1.clear();
     else if (end1 + 1 < line1.length())
       line1.erase(end1 + 1);
     std::string::size_type end2 = line2.find_last_not_of("\r\n");
     if (end2 == std::string::npos)
       line2.clear();
     else if (end2 + 1 < line2.length())
       line2.erase(end2 + 1);
     if (line1 != line2)
       return false;
   } while (!file1.eof() || !file2.eof());
   return true;
 }
 bool ReadFileToString(const FilePath& path, std::string* contents) {
   if (path.ReferencesParent())
     return false;
   FILE* file = file_util::OpenFile(path, "rb");
   if (!file) {
     return false;
   }
   char buf[1 << 16];
   size_t len;
   while ((len = fread(buf, 1, sizeof(buf), file)) > 0) {
     if (contents)
       contents->append(buf, len);
   }
   file_util::CloseFile(file);
   return true;
 }
 }  // namespace base
 // -----------------------------------------------------------------------------
 namespace file_util {
 using base::FileEnumerator;
 using base::FilePath;
 using base::kExtensionSeparator;
 using base::kMaxUniqueFiles;
 bool IsDirectoryEmpty(const FilePath& dir_path) {
   FileEnumerator files(dir_path, false,
       FileEnumerator::FILES | FileEnumerator::DIRECTORIES);
   if (files.Next().empty())
     return true;
   return false;
 }
 FILE* CreateAndOpenTemporaryFile(FilePath* path) {
   FilePath directory;
   if (!GetTempDir(&directory))
     return NULL;
   return CreateAndOpenTemporaryFileInDir(directory, path);
 }
 bool CreateDirectory(const base::FilePath& full_path) {
   return CreateDirectoryAndGetError(full_path, NULL);
 }
 bool GetFileSize(const FilePath& file_path, int64* file_size) {
   base::PlatformFileInfo info;
   if (!GetFileInfo(file_path, &info))
     return false;
   *file_size = info.size;
   return true;
 }
 bool TouchFile(const FilePath& path,
                const base::Time& last_accessed,
                const base::Time& last_modified) {
   int flags = base::PLATFORM_FILE_OPEN | base::PLATFORM_FILE_WRITE_ATTRIBUTES;
 #if defined(OS_WIN)
   // On Windows, FILE_FLAG_BACKUP_SEMANTICS is needed to open a directory.
   if (DirectoryExists(path))
     flags |= base::PLATFORM_FILE_BACKUP_SEMANTICS;
 #endif  // OS_WIN
   const base::PlatformFile file =
       base::CreatePlatformFile(path, flags, NULL, NULL);
   if (file != base::kInvalidPlatformFileValue) {
     bool result = base::TouchPlatformFile(file, last_accessed, last_modified);
     base::ClosePlatformFile(file);
     return result;
   }
   return false;
 }
 bool SetLastModifiedTime(const FilePath& path,
                          const base::Time& last_modified) {
   return TouchFile(path, last_modified, last_modified);
 }
 bool CloseFile(FILE* file) {
   if (file == NULL)
     return true;
   return fclose(file) == 0;
 }
 bool TruncateFile(FILE* file) {
   if (file == NULL)
     return false;
   long current_offset = ftell(file);
   if (current_offset == -1)
     return false;
 #if defined(OS_WIN)
   int fd = _fileno(file);
   if (_chsize(fd, current_offset) != 0)
     return false;
 #else
   int fd = fileno(file);
   if (ftruncate(fd, current_offset) != 0)
     return false;
 #endif
   return true;
 }
 int GetUniquePathNumber(
     const FilePath& path,
     const FilePath::StringType& suffix) {
   bool have_suffix = !suffix.empty();
   if (!PathExists(path) &&
       (!have_suffix || !PathExists(FilePath(path.value() + suffix)))) {
     return 0;
   }
   FilePath new_path;
   for (int count = 1; count <= kMaxUniqueFiles; ++count) {
     new_path =
         path.InsertBeforeExtensionASCII(base::StringPrintf(" (%d)", count));
     if (!PathExists(new_path) &&
         (!have_suffix || !PathExists(FilePath(new_path.value() + suffix)))) {
       return count;
     }
   }
   return -1;
 }
 }  // namespace file_util

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security/sandbox/chromium/base/file_util.cc@141e0f1194b1 (annotated)

security/sandbox/chromium/base/file_util.cc