Move file_util to base/files/ directory.

base/file_util_win.cc

Index: base/file_util_win.cc
diff --git a/base/file_util_win.cc b/base/file_util_win.cc
deleted file mode 100644
index e3cd1f83ac29f35b1d5e6c9c65b20263046d58cc..0000000000000000000000000000000000000000
--- a/base/file_util_win.cc
+++ /dev/null
@@ -1,810 +0,0 @@
-// 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"
-
-#include <windows.h>
-#include <io.h>
-#include <psapi.h>
-#include <shellapi.h>
-#include <shlobj.h>
-#include <time.h>
-
-#include <algorithm>
-#include <limits>
-#include <string>
-
-#include "base/files/file_enumerator.h"
-#include "base/files/file_path.h"
-#include "base/logging.h"
-#include "base/metrics/histogram.h"
-#include "base/process/process_handle.h"
-#include "base/rand_util.h"
-#include "base/strings/string_number_conversions.h"
-#include "base/strings/string_util.h"
-#include "base/strings/utf_string_conversions.h"
-#include "base/threading/thread_restrictions.h"
-#include "base/time/time.h"
-#include "base/win/scoped_handle.h"
-#include "base/win/windows_version.h"
-
-namespace base {
-
-namespace {
-
-const DWORD kFileShareAll =
-    FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE;
-
-}  // namespace
-
-FilePath MakeAbsoluteFilePath(const FilePath& input) {
-  ThreadRestrictions::AssertIOAllowed();
-  wchar_t file_path[MAX_PATH];
-  if (!_wfullpath(file_path, input.value().c_str(), MAX_PATH))
-    return FilePath();
-  return FilePath(file_path);
-}
-
-bool DeleteFile(const FilePath& path, bool recursive) {
-  ThreadRestrictions::AssertIOAllowed();
-
-  if (path.value().length() >= MAX_PATH)
-    return false;
-
-  // On XP SHFileOperation will return ERROR_ACCESS_DENIED instead of
-  // ERROR_FILE_NOT_FOUND, so just shortcut this here.
-  if (path.empty())
-    return true;
-
-  if (!recursive) {
-    // If not recursing, then first check to see if |path| is a directory.
-    // If it is, then remove it with RemoveDirectory.
-    File::Info file_info;
-    if (GetFileInfo(path, &file_info) && file_info.is_directory)
-      return RemoveDirectory(path.value().c_str()) != 0;
-
-    // Otherwise, it's a file, wildcard or non-existant. Try DeleteFile first
-    // because it should be faster. If DeleteFile fails, then we fall through
-    // to SHFileOperation, which will do the right thing.
-    if (::DeleteFile(path.value().c_str()) != 0)
-      return true;
-  }
-
-  // SHFILEOPSTRUCT wants the path to be terminated with two NULLs,
-  // so we have to use wcscpy because wcscpy_s writes non-NULLs
-  // into the rest of the buffer.
-  wchar_t double_terminated_path[MAX_PATH + 1] = {0};
-#pragma warning(suppress:4996)  // don't complain about wcscpy deprecation
-  wcscpy(double_terminated_path, path.value().c_str());
-
-  SHFILEOPSTRUCT file_operation = {0};
-  file_operation.wFunc = FO_DELETE;
-  file_operation.pFrom = double_terminated_path;
-  file_operation.fFlags = FOF_NOERRORUI | FOF_SILENT | FOF_NOCONFIRMATION;
-  if (!recursive)
-    file_operation.fFlags |= FOF_NORECURSION | FOF_FILESONLY;
-  int err = SHFileOperation(&file_operation);
-
-  // Since we're passing flags to the operation telling it to be silent,
-  // it's possible for the operation to be aborted/cancelled without err
-  // being set (although MSDN doesn't give any scenarios for how this can
-  // happen).  See MSDN for SHFileOperation and SHFILEOPTSTRUCT.
-  if (file_operation.fAnyOperationsAborted)
-    return false;
-
-  // Some versions of Windows return ERROR_FILE_NOT_FOUND (0x2) when deleting
-  // an empty directory and some return 0x402 when they should be returning
-  // ERROR_FILE_NOT_FOUND. MSDN says Vista and up won't return 0x402.  Windows 7
-  // can return DE_INVALIDFILES (0x7C) for nonexistent directories.
-  return (err == 0 || err == ERROR_FILE_NOT_FOUND || err == 0x402 ||
-          err == 0x7C);
-}
-
-bool DeleteFileAfterReboot(const FilePath& path) {
-  ThreadRestrictions::AssertIOAllowed();
-
-  if (path.value().length() >= MAX_PATH)
-    return false;
-
-  return MoveFileEx(path.value().c_str(), NULL,
-                    MOVEFILE_DELAY_UNTIL_REBOOT |
-                        MOVEFILE_REPLACE_EXISTING) != FALSE;
-}
-
-bool ReplaceFile(const FilePath& from_path,
-                 const FilePath& to_path,
-                 File::Error* error) {
-  ThreadRestrictions::AssertIOAllowed();
-  // Try a simple move first.  It will only succeed when |to_path| doesn't
-  // already exist.
-  if (::MoveFile(from_path.value().c_str(), to_path.value().c_str()))
-    return true;
-  // Try the full-blown replace if the move fails, as ReplaceFile will only
-  // succeed when |to_path| does exist. When writing to a network share, we may
-  // not be able to change the ACLs. Ignore ACL errors then
-  // (REPLACEFILE_IGNORE_MERGE_ERRORS).
-  if (::ReplaceFile(to_path.value().c_str(), from_path.value().c_str(), NULL,
-                    REPLACEFILE_IGNORE_MERGE_ERRORS, NULL, NULL)) {
-    return true;
-  }
-  if (error)
-    *error = File::OSErrorToFileError(GetLastError());
-  return false;
-}
-
-bool CopyDirectory(const FilePath& from_path, const FilePath& to_path,
-                   bool recursive) {
-  // NOTE(maruel): Previous version of this function used to call
-  // SHFileOperation().  This used to copy the file attributes and extended
-  // attributes, OLE structured storage, NTFS file system alternate data
-  // streams, SECURITY_DESCRIPTOR. In practice, this is not what we want, we
-  // want the containing directory to propagate its SECURITY_DESCRIPTOR.
-  ThreadRestrictions::AssertIOAllowed();
-
-  // NOTE: I suspect we could support longer paths, but that would involve
-  // analyzing all our usage of files.
-  if (from_path.value().length() >= MAX_PATH ||
-      to_path.value().length() >= MAX_PATH) {
-    return false;
-  }
-
-  // This function does not properly handle destinations within the source.
-  FilePath real_to_path = to_path;
-  if (PathExists(real_to_path)) {
-    real_to_path = MakeAbsoluteFilePath(real_to_path);
-    if (real_to_path.empty())
-      return false;
-  } else {
-    real_to_path = MakeAbsoluteFilePath(real_to_path.DirName());
-    if (real_to_path.empty())
-      return false;
-  }
-  FilePath real_from_path = MakeAbsoluteFilePath(from_path);
-  if (real_from_path.empty())
-    return false;
-  if (real_to_path.value().size() >= real_from_path.value().size() &&
-      real_to_path.value().compare(0, real_from_path.value().size(),
-                                   real_from_path.value()) == 0) {
-    return false;
-  }
-
-  int traverse_type = FileEnumerator::FILES;
-  if (recursive)
-    traverse_type |= FileEnumerator::DIRECTORIES;
-  FileEnumerator traversal(from_path, recursive, traverse_type);
-
-  if (!PathExists(from_path)) {
-    DLOG(ERROR) << "CopyDirectory() couldn't stat source directory: "
-                << from_path.value().c_str();
-    return false;
-  }
-  // TODO(maruel): This is not necessary anymore.
-  DCHECK(recursive || DirectoryExists(from_path));
-
-  FilePath current = from_path;
-  bool from_is_dir = DirectoryExists(from_path);
-  bool success = true;
-  FilePath from_path_base = from_path;
-  if (recursive && DirectoryExists(to_path)) {
-    // If the destination already exists and is a directory, then the
-    // top level of source needs to be copied.
-    from_path_base = from_path.DirName();
-  }
-
-  while (success && !current.empty()) {
-    // current is the source path, including from_path, so append
-    // the suffix after from_path to to_path to create the target_path.
-    FilePath target_path(to_path);
-    if (from_path_base != current) {
-      if (!from_path_base.AppendRelativePath(current, &target_path)) {
-        success = false;
-        break;
-      }
-    }
-
-    if (from_is_dir) {
-      if (!DirectoryExists(target_path) &&
-          !::CreateDirectory(target_path.value().c_str(), NULL)) {
-        DLOG(ERROR) << "CopyDirectory() couldn't create directory: "
-                    << target_path.value().c_str();
-        success = false;
-      }
-    } else if (!internal::CopyFileUnsafe(current, target_path)) {
-      DLOG(ERROR) << "CopyDirectory() couldn't create file: "
-                  << target_path.value().c_str();
-      success = false;
-    }
-
-    current = traversal.Next();
-    if (!current.empty())
-      from_is_dir = traversal.GetInfo().IsDirectory();
-  }
-
-  return success;
-}
-
-bool PathExists(const FilePath& path) {
-  ThreadRestrictions::AssertIOAllowed();
-  return (GetFileAttributes(path.value().c_str()) != INVALID_FILE_ATTRIBUTES);
-}
-
-bool PathIsWritable(const FilePath& path) {
-  ThreadRestrictions::AssertIOAllowed();
-  HANDLE dir =
-      CreateFile(path.value().c_str(), FILE_ADD_FILE, kFileShareAll,
-                 NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
-
-  if (dir == INVALID_HANDLE_VALUE)
-    return false;
-
-  CloseHandle(dir);
-  return true;
-}
-
-bool DirectoryExists(const FilePath& path) {
-  ThreadRestrictions::AssertIOAllowed();
-  DWORD fileattr = GetFileAttributes(path.value().c_str());
-  if (fileattr != INVALID_FILE_ATTRIBUTES)
-    return (fileattr & FILE_ATTRIBUTE_DIRECTORY) != 0;
-  return false;
-}
-
-bool GetTempDir(FilePath* path) {
-  wchar_t temp_path[MAX_PATH + 1];
-  DWORD path_len = ::GetTempPath(MAX_PATH, temp_path);
-  if (path_len >= MAX_PATH || path_len <= 0)
-    return false;
-  // TODO(evanm): the old behavior of this function was to always strip the
-  // trailing slash.  We duplicate this here, but it shouldn't be necessary
-  // when everyone is using the appropriate FilePath APIs.
-  *path = FilePath(temp_path).StripTrailingSeparators();
-  return true;
-}
-
-FilePath GetHomeDir() {
-  char16 result[MAX_PATH];
-  if (SUCCEEDED(SHGetFolderPath(NULL, CSIDL_PROFILE, NULL, SHGFP_TYPE_CURRENT,
-                                result)) &&
-      result[0]) {
-    return FilePath(result);
-  }
-
-  // Fall back to the temporary directory on failure.
-  FilePath temp;
-  if (GetTempDir(&temp))
-    return temp;
-
-  // Last resort.
-  return FilePath(L"C:\\");
-}
-
-bool CreateTemporaryFile(FilePath* path) {
-  ThreadRestrictions::AssertIOAllowed();
-
-  FilePath temp_file;
-
-  if (!GetTempDir(path))
-    return false;
-
-  if (CreateTemporaryFileInDir(*path, &temp_file)) {
-    *path = temp_file;
-    return true;
-  }
-
-  return false;
-}
-
-// On POSIX we have semantics to create and open a temporary file
-// atomically.
-// TODO(jrg): is there equivalent call to use on Windows instead of
-// going 2-step?
-FILE* CreateAndOpenTemporaryFileInDir(const FilePath& dir, FilePath* path) {
-  ThreadRestrictions::AssertIOAllowed();
-  if (!CreateTemporaryFileInDir(dir, path)) {
-    return NULL;
-  }
-  // Open file in binary mode, to avoid problems with fwrite. On Windows
-  // it replaces \n's with \r\n's, which may surprise you.
-  // Reference: http://msdn.microsoft.com/en-us/library/h9t88zwz(VS.71).aspx
-  return OpenFile(*path, "wb+");
-}
-
-bool CreateTemporaryFileInDir(const FilePath& dir, FilePath* temp_file) {
-  ThreadRestrictions::AssertIOAllowed();
-
-  wchar_t temp_name[MAX_PATH + 1];
-
-  if (!GetTempFileName(dir.value().c_str(), L"", 0, temp_name)) {
-    DPLOG(WARNING) << "Failed to get temporary file name in "
-                   << UTF16ToUTF8(dir.value());
-    return false;
-  }
-
-  wchar_t long_temp_name[MAX_PATH + 1];
-  DWORD long_name_len = GetLongPathName(temp_name, long_temp_name, MAX_PATH);
-  if (long_name_len > MAX_PATH || long_name_len == 0) {
-    // GetLongPathName() failed, but we still have a temporary file.
-    *temp_file = FilePath(temp_name);
-    return true;
-  }
-
-  FilePath::StringType long_temp_name_str;
-  long_temp_name_str.assign(long_temp_name, long_name_len);
-  *temp_file = FilePath(long_temp_name_str);
-  return true;
-}
-
-bool CreateTemporaryDirInDir(const FilePath& base_dir,
-                             const FilePath::StringType& prefix,
-                             FilePath* new_dir) {
-  ThreadRestrictions::AssertIOAllowed();
-
-  FilePath path_to_create;
-
-  for (int count = 0; count < 50; ++count) {
-    // Try create a new temporary directory with random generated name. If
-    // the one exists, keep trying another path name until we reach some limit.
-    string16 new_dir_name;
-    new_dir_name.assign(prefix);
-    new_dir_name.append(IntToString16(GetCurrentProcId()));
-    new_dir_name.push_back('_');
-    new_dir_name.append(IntToString16(RandInt(0, kint16max)));
-
-    path_to_create = base_dir.Append(new_dir_name);
-    if (::CreateDirectory(path_to_create.value().c_str(), NULL)) {
-      *new_dir = path_to_create;
-      return true;
-    }
-  }
-
-  return false;
-}
-
-bool CreateNewTempDirectory(const FilePath::StringType& prefix,
-                            FilePath* new_temp_path) {
-  ThreadRestrictions::AssertIOAllowed();
-
-  FilePath system_temp_dir;
-  if (!GetTempDir(&system_temp_dir))
-    return false;
-
-  return CreateTemporaryDirInDir(system_temp_dir, prefix, new_temp_path);
-}
-
-bool CreateDirectoryAndGetError(const FilePath& full_path,
-                                File::Error* error) {
-  ThreadRestrictions::AssertIOAllowed();
-
-  // If the path exists, we've succeeded if it's a directory, failed otherwise.
-  const wchar_t* full_path_str = full_path.value().c_str();
-  DWORD fileattr = ::GetFileAttributes(full_path_str);
-  if (fileattr != INVALID_FILE_ATTRIBUTES) {
-    if ((fileattr & FILE_ATTRIBUTE_DIRECTORY) != 0) {
-      DVLOG(1) << "CreateDirectory(" << full_path_str << "), "
-               << "directory already exists.";
-      return true;
-    }
-    DLOG(WARNING) << "CreateDirectory(" << full_path_str << "), "
-                  << "conflicts with existing file.";
-    if (error) {
-      *error = File::FILE_ERROR_NOT_A_DIRECTORY;
-    }
-    return false;
-  }
-
-  // Invariant:  Path does not exist as file or directory.
-
-  // Attempt to create the parent recursively.  This will immediately return
-  // true if it already exists, otherwise will create all required parent
-  // directories starting with the highest-level missing parent.
-  FilePath parent_path(full_path.DirName());
-  if (parent_path.value() == full_path.value()) {
-    if (error) {
-      *error = File::FILE_ERROR_NOT_FOUND;
-    }
-    return false;
-  }
-  if (!CreateDirectoryAndGetError(parent_path, error)) {
-    DLOG(WARNING) << "Failed to create one of the parent directories.";
-    if (error) {
-      DCHECK(*error != File::FILE_OK);
-    }
-    return false;
-  }
-
-  if (!::CreateDirectory(full_path_str, NULL)) {
-    DWORD error_code = ::GetLastError();
-    if (error_code == ERROR_ALREADY_EXISTS && DirectoryExists(full_path)) {
-      // This error code ERROR_ALREADY_EXISTS doesn't indicate whether we
-      // were racing with someone creating the same directory, or a file
-      // with the same path.  If DirectoryExists() returns true, we lost the
-      // race to create the same directory.
-      return true;
-    } else {
-      if (error)
-        *error = File::OSErrorToFileError(error_code);
-      DLOG(WARNING) << "Failed to create directory " << full_path_str
-                    << ", last error is " << error_code << ".";
-      return false;
-    }
-  } else {
-    return true;
-  }
-}
-
-bool NormalizeFilePath(const FilePath& path, FilePath* real_path) {
-  ThreadRestrictions::AssertIOAllowed();
-  FilePath mapped_file;
-  if (!NormalizeToNativeFilePath(path, &mapped_file))
-    return false;
-  // NormalizeToNativeFilePath() will return a path that starts with
-  // "\Device\Harddisk...".  Helper DevicePathToDriveLetterPath()
-  // will find a drive letter which maps to the path's device, so
-  // that we return a path starting with a drive letter.
-  return DevicePathToDriveLetterPath(mapped_file, real_path);
-}
-
-bool DevicePathToDriveLetterPath(const FilePath& nt_device_path,
-                                 FilePath* out_drive_letter_path) {
-  ThreadRestrictions::AssertIOAllowed();
-
-  // Get the mapping of drive letters to device paths.
-  const int kDriveMappingSize = 1024;
-  wchar_t drive_mapping[kDriveMappingSize] = {'\0'};
-  if (!::GetLogicalDriveStrings(kDriveMappingSize - 1, drive_mapping)) {
-    DLOG(ERROR) << "Failed to get drive mapping.";
-    return false;
-  }
-
-  // The drive mapping is a sequence of null terminated strings.
-  // The last string is empty.
-  wchar_t* drive_map_ptr = drive_mapping;
-  wchar_t device_path_as_string[MAX_PATH];
-  wchar_t drive[] = L" :";
-
-  // For each string in the drive mapping, get the junction that links
-  // to it.  If that junction is a prefix of |device_path|, then we
-  // know that |drive| is the real path prefix.
-  while (*drive_map_ptr) {
-    drive[0] = drive_map_ptr[0];  // Copy the drive letter.
-
-    if (QueryDosDevice(drive, device_path_as_string, MAX_PATH)) {
-      FilePath device_path(device_path_as_string);
-      if (device_path == nt_device_path ||
-          device_path.IsParent(nt_device_path)) {
-        *out_drive_letter_path = FilePath(drive +
-            nt_device_path.value().substr(wcslen(device_path_as_string)));
-        return true;
-      }
-    }
-    // Move to the next drive letter string, which starts one
-    // increment after the '\0' that terminates the current string.
-    while (*drive_map_ptr++);
-  }
-
-  // No drive matched.  The path does not start with a device junction
-  // that is mounted as a drive letter.  This means there is no drive
-  // letter path to the volume that holds |device_path|, so fail.
-  return false;
-}
-
-bool NormalizeToNativeFilePath(const FilePath& path, FilePath* nt_path) {
-  ThreadRestrictions::AssertIOAllowed();
-  // In Vista, GetFinalPathNameByHandle() would give us the real path
-  // from a file handle.  If we ever deprecate XP, consider changing the
-  // code below to a call to GetFinalPathNameByHandle().  The method this
-  // function uses is explained in the following msdn article:
-  // http://msdn.microsoft.com/en-us/library/aa366789(VS.85).aspx
-  base::win::ScopedHandle file_handle(
-      ::CreateFile(path.value().c_str(),
-                   GENERIC_READ,
-                   kFileShareAll,
-                   NULL,
-                   OPEN_EXISTING,
-                   FILE_ATTRIBUTE_NORMAL,
-                   NULL));
-  if (!file_handle)
-    return false;
-
-  // Create a file mapping object.  Can't easily use MemoryMappedFile, because
-  // we only map the first byte, and need direct access to the handle. You can
-  // not map an empty file, this call fails in that case.
-  base::win::ScopedHandle file_map_handle(
-      ::CreateFileMapping(file_handle.Get(),
-                          NULL,
-                          PAGE_READONLY,
-                          0,
-                          1,  // Just one byte.  No need to look at the data.
-                          NULL));
-  if (!file_map_handle)
-    return false;
-
-  // Use a view of the file to get the path to the file.
-  void* file_view = MapViewOfFile(file_map_handle.Get(),
-                                  FILE_MAP_READ, 0, 0, 1);
-  if (!file_view)
-    return false;
-
-  // The expansion of |path| into a full path may make it longer.
-  // GetMappedFileName() will fail if the result is longer than MAX_PATH.
-  // Pad a bit to be safe.  If kMaxPathLength is ever changed to be less
-  // than MAX_PATH, it would be nessisary to test that GetMappedFileName()
-  // not return kMaxPathLength.  This would mean that only part of the
-  // path fit in |mapped_file_path|.
-  const int kMaxPathLength = MAX_PATH + 10;
-  wchar_t mapped_file_path[kMaxPathLength];
-  bool success = false;
-  HANDLE cp = GetCurrentProcess();
-  if (::GetMappedFileNameW(cp, file_view, mapped_file_path, kMaxPathLength)) {
-    *nt_path = FilePath(mapped_file_path);
-    success = true;
-  }
-  ::UnmapViewOfFile(file_view);
-  return success;
-}
-
-// TODO(rkc): Work out if we want to handle NTFS junctions here or not, handle
-// them if we do decide to.
-bool IsLink(const FilePath& file_path) {
-  return false;
-}
-
-bool GetFileInfo(const FilePath& file_path, File::Info* results) {
-  ThreadRestrictions::AssertIOAllowed();
-
-  WIN32_FILE_ATTRIBUTE_DATA attr;
-  if (!GetFileAttributesEx(file_path.value().c_str(),
-                           GetFileExInfoStandard, &attr)) {
-    return false;
-  }
-
-  ULARGE_INTEGER size;
-  size.HighPart = attr.nFileSizeHigh;
-  size.LowPart = attr.nFileSizeLow;
-  results->size = size.QuadPart;
-
-  results->is_directory =
-      (attr.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0;
-  results->last_modified = Time::FromFileTime(attr.ftLastWriteTime);
-  results->last_accessed = Time::FromFileTime(attr.ftLastAccessTime);
-  results->creation_time = Time::FromFileTime(attr.ftCreationTime);
-
-  return true;
-}
-
-FILE* OpenFile(const FilePath& filename, const char* mode) {
-  ThreadRestrictions::AssertIOAllowed();
-  std::wstring w_mode = ASCIIToWide(std::string(mode));
-  return _wfsopen(filename.value().c_str(), w_mode.c_str(), _SH_DENYNO);
-}
-
-FILE* FileToFILE(File file, const char* mode) {
-  if (!file.IsValid())
-    return NULL;
-  int fd =
-      _open_osfhandle(reinterpret_cast<intptr_t>(file.GetPlatformFile()), 0);
-  if (fd < 0)
-    return NULL;
-  file.TakePlatformFile();
-  FILE* stream = _fdopen(fd, mode);
-  if (!stream)
-    _close(fd);
-  return stream;
-}
-
-int ReadFile(const FilePath& filename, char* data, int max_size) {
-  ThreadRestrictions::AssertIOAllowed();
-  base::win::ScopedHandle file(CreateFile(filename.value().c_str(),
-                                          GENERIC_READ,
-                                          FILE_SHARE_READ | FILE_SHARE_WRITE,
-                                          NULL,
-                                          OPEN_EXISTING,
-                                          FILE_FLAG_SEQUENTIAL_SCAN,
-                                          NULL));
-  if (!file)
-    return -1;
-
-  DWORD read;
-  if (::ReadFile(file, data, max_size, &read, NULL))
-    return read;
-
-  return -1;
-}
-
-int WriteFile(const FilePath& filename, const char* data, int size) {
-  ThreadRestrictions::AssertIOAllowed();
-  base::win::ScopedHandle file(CreateFile(filename.value().c_str(),
-                                          GENERIC_WRITE,
-                                          0,
-                                          NULL,
-                                          CREATE_ALWAYS,
-                                          0,
-                                          NULL));
-  if (!file) {
-    DPLOG(WARNING) << "CreateFile failed for path "
-                   << UTF16ToUTF8(filename.value());
-    return -1;
-  }
-
-  DWORD written;
-  BOOL result = ::WriteFile(file, data, size, &written, NULL);
-  if (result && static_cast<int>(written) == size)
-    return written;
-
-  if (!result) {
-    // WriteFile failed.
-    DPLOG(WARNING) << "writing file " << UTF16ToUTF8(filename.value())
-                   << " failed";
-  } else {
-    // Didn't write all the bytes.
-    DLOG(WARNING) << "wrote" << written << " bytes to "
-                  << UTF16ToUTF8(filename.value()) << " expected " << size;
-  }
-  return -1;
-}
-
-int AppendToFile(const FilePath& filename, const char* data, int size) {
-  ThreadRestrictions::AssertIOAllowed();
-  base::win::ScopedHandle file(CreateFile(filename.value().c_str(),
-                                          FILE_APPEND_DATA,
-                                          0,
-                                          NULL,
-                                          OPEN_EXISTING,
-                                          0,
-                                          NULL));
-  if (!file) {
-    DPLOG(WARNING) << "CreateFile failed for path "
-                   << UTF16ToUTF8(filename.value());
-    return -1;
-  }
-
-  DWORD written;
-  BOOL result = ::WriteFile(file, data, size, &written, NULL);
-  if (result && static_cast<int>(written) == size)
-    return written;
-
-  if (!result) {
-    // WriteFile failed.
-    DPLOG(WARNING) << "writing file " << UTF16ToUTF8(filename.value())
-                   << " failed";
-  } else {
-    // Didn't write all the bytes.
-    DLOG(WARNING) << "wrote" << written << " bytes to "
-                  << UTF16ToUTF8(filename.value()) << " expected " << size;
-  }
-  return -1;
-}
-
-// Gets the current working directory for the process.
-bool GetCurrentDirectory(FilePath* dir) {
-  ThreadRestrictions::AssertIOAllowed();
-
-  wchar_t system_buffer[MAX_PATH];
-  system_buffer[0] = 0;
-  DWORD len = ::GetCurrentDirectory(MAX_PATH, system_buffer);
-  if (len == 0 || len > MAX_PATH)
-    return false;
-  // TODO(evanm): the old behavior of this function was to always strip the
-  // trailing slash.  We duplicate this here, but it shouldn't be necessary
-  // when everyone is using the appropriate FilePath APIs.
-  std::wstring dir_str(system_buffer);
-  *dir = FilePath(dir_str).StripTrailingSeparators();
-  return true;
-}
-
-// Sets the current working directory for the process.
-bool SetCurrentDirectory(const FilePath& directory) {
-  ThreadRestrictions::AssertIOAllowed();
-  BOOL ret = ::SetCurrentDirectory(directory.value().c_str());
-  return ret != 0;
-}
-
-int GetMaximumPathComponentLength(const FilePath& path) {
-  ThreadRestrictions::AssertIOAllowed();
-
-  wchar_t volume_path[MAX_PATH];
-  if (!GetVolumePathNameW(path.NormalizePathSeparators().value().c_str(),
-                          volume_path,
-                          arraysize(volume_path))) {
-    return -1;
-  }
-
-  DWORD max_length = 0;
-  if (!GetVolumeInformationW(volume_path, NULL, 0, NULL, &max_length, NULL,
-                             NULL, 0)) {
-    return -1;
-  }
-
-  // Length of |path| with path separator appended.
-  size_t prefix = path.StripTrailingSeparators().value().size() + 1;
-  // The whole path string must be shorter than MAX_PATH. That is, it must be
-  // prefix + component_length < MAX_PATH (or equivalently, <= MAX_PATH - 1).
-  int whole_path_limit = std::max(0, MAX_PATH - 1 - static_cast<int>(prefix));
-  return std::min(whole_path_limit, static_cast<int>(max_length));
-}
-
-// -----------------------------------------------------------------------------
-
-namespace internal {
-
-bool MoveUnsafe(const FilePath& from_path, const FilePath& to_path) {
-  ThreadRestrictions::AssertIOAllowed();
-
-  // NOTE: I suspect we could support longer paths, but that would involve
-  // analyzing all our usage of files.
-  if (from_path.value().length() >= MAX_PATH ||
-      to_path.value().length() >= MAX_PATH) {
-    return false;
-  }
-  if (MoveFileEx(from_path.value().c_str(), to_path.value().c_str(),
-                 MOVEFILE_COPY_ALLOWED | MOVEFILE_REPLACE_EXISTING) != 0)
-    return true;
-
-  // Keep the last error value from MoveFileEx around in case the below
-  // fails.
-  bool ret = false;
-  DWORD last_error = ::GetLastError();
-
-  if (DirectoryExists(from_path)) {
-    // MoveFileEx fails if moving directory across volumes. We will simulate
-    // the move by using Copy and Delete. Ideally we could check whether
-    // from_path and to_path are indeed in different volumes.
-    ret = internal::CopyAndDeleteDirectory(from_path, to_path);
-  }
-
-  if (!ret) {
-    // Leave a clue about what went wrong so that it can be (at least) picked
-    // up by a PLOG entry.
-    ::SetLastError(last_error);
-  }
-
-  return ret;
-}
-
-bool CopyFileUnsafe(const FilePath& from_path, const FilePath& to_path) {
-  ThreadRestrictions::AssertIOAllowed();
-
-  // NOTE: I suspect we could support longer paths, but that would involve
-  // analyzing all our usage of files.
-  if (from_path.value().length() >= MAX_PATH ||
-      to_path.value().length() >= MAX_PATH) {
-    return false;
-  }
-
-  // Unlike the posix implementation that copies the file manually and discards
-  // the ACL bits, CopyFile() copies the complete SECURITY_DESCRIPTOR and access
-  // bits, which is usually not what we want. We can't do much about the
-  // SECURITY_DESCRIPTOR but at least remove the read only bit.
-  const wchar_t* dest = to_path.value().c_str();
-  if (!::CopyFile(from_path.value().c_str(), dest, false)) {
-    // Copy failed.
-    return false;
-  }
-  DWORD attrs = GetFileAttributes(dest);
-  if (attrs == INVALID_FILE_ATTRIBUTES) {
-    return false;
-  }
-  if (attrs & FILE_ATTRIBUTE_READONLY) {
-    SetFileAttributes(dest, attrs & ~FILE_ATTRIBUTE_READONLY);
-  }
-  return true;
-}
-
-bool CopyAndDeleteDirectory(const FilePath& from_path,
-                            const FilePath& to_path) {
-  ThreadRestrictions::AssertIOAllowed();
-  if (CopyDirectory(from_path, to_path, true)) {
-    if (DeleteFile(from_path, true))
-      return true;
-
-    // Like Move, this function is not transactional, so we just
-    // leave the copied bits behind if deleting from_path fails.
-    // If to_path exists previously then we have already overwritten
-    // it by now, we don't get better off by deleting the new bits.
-  }
-  return false;
-}
-
-}  // namespace internal
-}  // namespace base