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file_util_win.cc
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file_util_win.cc
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// Copyright (c) 2010 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 <propvarutil.h>
#include <psapi.h>
#include <shellapi.h>
#include <shlobj.h>
#include <time.h>
#include <string>
#include "base/file_path.h"
#include "base/logging.h"
#include "base/metrics/histogram.h"
#include "base/win/pe_image.h"
#include "base/win/scoped_handle.h"
#include "base/string_number_conversions.h"
#include "base/string_util.h"
#include "base/thread_restrictions.h"
#include "base/time.h"
#include "base/utf_string_conversions.h"
#include "base/win_util.h"
#include "base/win/scoped_comptr.h"
#include "base/win/windows_version.h"
namespace file_util {
namespace {
const DWORD kFileShareAll =
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE;
// Helper for NormalizeFilePath(), defined below.
bool DevicePathToDriveLetterPath(const FilePath& device_path,
FilePath* drive_letter_path) {
base::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)) {
LOG(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_name[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_name, MAX_PATH) &&
StartsWith(device_path.value(), device_name, true)) {
*drive_letter_path = FilePath(drive +
device_path.value().substr(wcslen(device_name)));
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;
}
} // namespace
std::wstring GetDirectoryFromPath(const std::wstring& path) {
base::ThreadRestrictions::AssertIOAllowed();
wchar_t path_buffer[MAX_PATH];
wchar_t* file_ptr = NULL;
if (GetFullPathName(path.c_str(), MAX_PATH, path_buffer, &file_ptr) == 0)
return L"";
std::wstring::size_type length =
file_ptr ? file_ptr - path_buffer : path.length();
std::wstring directory(path, 0, length);
return FilePath(directory).StripTrailingSeparators().value();
}
bool AbsolutePath(FilePath* path) {
base::ThreadRestrictions::AssertIOAllowed();
wchar_t file_path_buf[MAX_PATH];
if (!_wfullpath(file_path_buf, path->value().c_str(), MAX_PATH))
return false;
*path = FilePath(file_path_buf);
return true;
}
int CountFilesCreatedAfter(const FilePath& path,
const base::Time& comparison_time) {
base::ThreadRestrictions::AssertIOAllowed();
int file_count = 0;
FILETIME comparison_filetime(comparison_time.ToFileTime());
WIN32_FIND_DATA find_file_data;
// All files in given dir
std::wstring filename_spec = path.Append(L"*").value();
HANDLE find_handle = FindFirstFile(filename_spec.c_str(), &find_file_data);
if (find_handle != INVALID_HANDLE_VALUE) {
do {
// Don't count current or parent directories.
if ((wcscmp(find_file_data.cFileName, L"..") == 0) ||
(wcscmp(find_file_data.cFileName, L".") == 0))
continue;
long result = CompareFileTime(&find_file_data.ftCreationTime,
&comparison_filetime);
// File was created after or on comparison time
if ((result == 1) || (result == 0))
++file_count;
} while (FindNextFile(find_handle, &find_file_data));
FindClose(find_handle);
}
return file_count;
}
bool Delete(const FilePath& path, bool recursive) {
base::ThreadRestrictions::AssertIOAllowed();
if (path.value().length() >= MAX_PATH)
return false;
if (!recursive) {
// If not recursing, then first check to see if |path| is a directory.
// If it is, then remove it with RemoveDirectory.
base::PlatformFileInfo 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);
// 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.
return (err == 0 || err == ERROR_FILE_NOT_FOUND || err == 0x402);
}
bool DeleteAfterReboot(const FilePath& path) {
base::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 Move(const FilePath& from_path, const FilePath& to_path) {
base::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;
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.
return CopyAndDeleteDirectory(from_path, to_path);
}
return false;
}
bool ReplaceFile(const FilePath& from_path, const FilePath& to_path) {
base::ThreadRestrictions::AssertIOAllowed();
// Make sure that the target file exists.
HANDLE target_file = ::CreateFile(
to_path.value().c_str(),
0,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
CREATE_NEW,
FILE_ATTRIBUTE_NORMAL,
NULL);
if (target_file != INVALID_HANDLE_VALUE)
::CloseHandle(target_file);
// When writing to a network share, we may not be able to change the ACLs.
// Ignore ACL errors then (REPLACEFILE_IGNORE_MERGE_ERRORS).
return ::ReplaceFile(to_path.value().c_str(),
from_path.value().c_str(), NULL,
REPLACEFILE_IGNORE_MERGE_ERRORS, NULL, NULL) ? true : false;
}
bool CopyFile(const FilePath& from_path, const FilePath& to_path) {
base::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;
}
return (::CopyFile(from_path.value().c_str(), to_path.value().c_str(),
false) != 0);
}
bool ShellCopy(const FilePath& from_path, const FilePath& to_path,
bool recursive) {
base::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;
}
// 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_from[MAX_PATH + 1] = {0};
wchar_t double_terminated_path_to[MAX_PATH + 1] = {0};
#pragma warning(suppress:4996) // don't complain about wcscpy deprecation
wcscpy(double_terminated_path_from, from_path.value().c_str());
#pragma warning(suppress:4996) // don't complain about wcscpy deprecation
wcscpy(double_terminated_path_to, to_path.value().c_str());
SHFILEOPSTRUCT file_operation = {0};
file_operation.wFunc = FO_COPY;
file_operation.pFrom = double_terminated_path_from;
file_operation.pTo = double_terminated_path_to;
file_operation.fFlags = FOF_NOERRORUI | FOF_SILENT | FOF_NOCONFIRMATION |
FOF_NOCONFIRMMKDIR;
if (!recursive)
file_operation.fFlags |= FOF_NORECURSION | FOF_FILESONLY;
return (SHFileOperation(&file_operation) == 0);
}
bool CopyDirectory(const FilePath& from_path, const FilePath& to_path,
bool recursive) {
base::ThreadRestrictions::AssertIOAllowed();
if (recursive)
return ShellCopy(from_path, to_path, true);
// The following code assumes that from path is a directory.
DCHECK(DirectoryExists(from_path));
// Instead of creating a new directory, we copy the old one to include the
// security information of the folder as part of the copy.
if (!PathExists(to_path)) {
// Except that Vista fails to do that, and instead do a recursive copy if
// the target directory doesn't exist.
if (base::win::GetVersion() >= base::win::VERSION_VISTA)
CreateDirectory(to_path);
else
ShellCopy(from_path, to_path, false);
}
FilePath directory = from_path.Append(L"*.*");
return ShellCopy(directory, to_path, false);
}
bool CopyAndDeleteDirectory(const FilePath& from_path,
const FilePath& to_path) {
base::ThreadRestrictions::AssertIOAllowed();
if (CopyDirectory(from_path, to_path, true)) {
if (Delete(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;
}
bool PathExists(const FilePath& path) {
base::ThreadRestrictions::AssertIOAllowed();
return (GetFileAttributes(path.value().c_str()) != INVALID_FILE_ATTRIBUTES);
}
bool PathIsWritable(const FilePath& path) {
base::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) {
base::ThreadRestrictions::AssertIOAllowed();
DWORD fileattr = GetFileAttributes(path.value().c_str());
if (fileattr != INVALID_FILE_ATTRIBUTES)
return (fileattr & FILE_ATTRIBUTE_DIRECTORY) != 0;
return false;
}
bool GetFileCreationLocalTimeFromHandle(HANDLE file_handle,
LPSYSTEMTIME creation_time) {
base::ThreadRestrictions::AssertIOAllowed();
if (!file_handle)
return false;
FILETIME utc_filetime;
if (!GetFileTime(file_handle, &utc_filetime, NULL, NULL))
return false;
FILETIME local_filetime;
if (!FileTimeToLocalFileTime(&utc_filetime, &local_filetime))
return false;
return !!FileTimeToSystemTime(&local_filetime, creation_time);
}
bool GetFileCreationLocalTime(const std::wstring& filename,
LPSYSTEMTIME creation_time) {
base::ThreadRestrictions::AssertIOAllowed();
base::win::ScopedHandle file_handle(
CreateFile(filename.c_str(), GENERIC_READ, kFileShareAll, NULL,
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL));
return GetFileCreationLocalTimeFromHandle(file_handle.Get(), creation_time);
}
bool ResolveShortcut(FilePath* path) {
base::ThreadRestrictions::AssertIOAllowed();
HRESULT result;
base::win::ScopedComPtr<IShellLink> i_shell_link;
bool is_resolved = false;
// Get pointer to the IShellLink interface
result = i_shell_link.CreateInstance(CLSID_ShellLink, NULL,
CLSCTX_INPROC_SERVER);
if (SUCCEEDED(result)) {
base::win::ScopedComPtr<IPersistFile> persist;
// Query IShellLink for the IPersistFile interface
result = persist.QueryFrom(i_shell_link);
if (SUCCEEDED(result)) {
WCHAR temp_path[MAX_PATH];
// Load the shell link
result = persist->Load(path->value().c_str(), STGM_READ);
if (SUCCEEDED(result)) {
// Try to find the target of a shortcut
result = i_shell_link->Resolve(0, SLR_NO_UI);
if (SUCCEEDED(result)) {
result = i_shell_link->GetPath(temp_path, MAX_PATH,
NULL, SLGP_UNCPRIORITY);
*path = FilePath(temp_path);
is_resolved = true;
}
}
}
}
return is_resolved;
}
bool CreateShortcutLink(const wchar_t *source, const wchar_t *destination,
const wchar_t *working_dir, const wchar_t *arguments,
const wchar_t *description, const wchar_t *icon,
int icon_index, const wchar_t* app_id) {
base::ThreadRestrictions::AssertIOAllowed();
// Length of arguments and description must be less than MAX_PATH.
DCHECK(lstrlen(arguments) < MAX_PATH);
DCHECK(lstrlen(description) < MAX_PATH);
base::win::ScopedComPtr<IShellLink> i_shell_link;
base::win::ScopedComPtr<IPersistFile> i_persist_file;
// Get pointer to the IShellLink interface
HRESULT result = i_shell_link.CreateInstance(CLSID_ShellLink, NULL,
CLSCTX_INPROC_SERVER);
if (FAILED(result))
return false;
// Query IShellLink for the IPersistFile interface
result = i_persist_file.QueryFrom(i_shell_link);
if (FAILED(result))
return false;
if (FAILED(i_shell_link->SetPath(source)))
return false;
if (working_dir && FAILED(i_shell_link->SetWorkingDirectory(working_dir)))
return false;
if (arguments && FAILED(i_shell_link->SetArguments(arguments)))
return false;
if (description && FAILED(i_shell_link->SetDescription(description)))
return false;
if (icon && FAILED(i_shell_link->SetIconLocation(icon, icon_index)))
return false;
if (app_id && (base::win::GetVersion() >= base::win::VERSION_WIN7)) {
base::win::ScopedComPtr<IPropertyStore> property_store;
if (FAILED(property_store.QueryFrom(i_shell_link)))
return false;
if (!win_util::SetAppIdForPropertyStore(property_store, app_id))
return false;
}
result = i_persist_file->Save(destination, TRUE);
return SUCCEEDED(result);
}
bool UpdateShortcutLink(const wchar_t *source, const wchar_t *destination,
const wchar_t *working_dir, const wchar_t *arguments,
const wchar_t *description, const wchar_t *icon,
int icon_index, const wchar_t* app_id) {
base::ThreadRestrictions::AssertIOAllowed();
// Length of arguments and description must be less than MAX_PATH.
DCHECK(lstrlen(arguments) < MAX_PATH);
DCHECK(lstrlen(description) < MAX_PATH);
// Get pointer to the IPersistFile interface and load existing link
base::win::ScopedComPtr<IShellLink> i_shell_link;
if (FAILED(i_shell_link.CreateInstance(CLSID_ShellLink, NULL,
CLSCTX_INPROC_SERVER)))
return false;
base::win::ScopedComPtr<IPersistFile> i_persist_file;
if (FAILED(i_persist_file.QueryFrom(i_shell_link)))
return false;
if (FAILED(i_persist_file->Load(destination, STGM_READWRITE)))
return false;
if (source && FAILED(i_shell_link->SetPath(source)))
return false;
if (working_dir && FAILED(i_shell_link->SetWorkingDirectory(working_dir)))
return false;
if (arguments && FAILED(i_shell_link->SetArguments(arguments)))
return false;
if (description && FAILED(i_shell_link->SetDescription(description)))
return false;
if (icon && FAILED(i_shell_link->SetIconLocation(icon, icon_index)))
return false;
if (app_id && base::win::GetVersion() >= base::win::VERSION_WIN7) {
base::win::ScopedComPtr<IPropertyStore> property_store;
if (FAILED(property_store.QueryFrom(i_shell_link)))
return false;
if (!win_util::SetAppIdForPropertyStore(property_store, app_id))
return false;
}
HRESULT result = i_persist_file->Save(destination, TRUE);
return SUCCEEDED(result);
}
bool TaskbarPinShortcutLink(const wchar_t* shortcut) {
base::ThreadRestrictions::AssertIOAllowed();
// "Pin to taskbar" is only supported after Win7.
if (base::win::GetVersion() < base::win::VERSION_WIN7)
return false;
int result = reinterpret_cast<int>(ShellExecute(NULL, L"taskbarpin", shortcut,
NULL, NULL, 0));
return result > 32;
}
bool TaskbarUnpinShortcutLink(const wchar_t* shortcut) {
base::ThreadRestrictions::AssertIOAllowed();
// "Unpin from taskbar" is only supported after Win7.
if (base::win::GetVersion() < base::win::VERSION_WIN7)
return false;
int result = reinterpret_cast<int>(ShellExecute(NULL, L"taskbarunpin",
shortcut, NULL, NULL, 0));
return result > 32;
}
bool GetTempDir(FilePath* path) {
base::ThreadRestrictions::AssertIOAllowed();
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;
}
bool GetShmemTempDir(FilePath* path) {
return GetTempDir(path);
}
bool CreateTemporaryFile(FilePath* path) {
base::ThreadRestrictions::AssertIOAllowed();
FilePath temp_file;
if (!GetTempDir(path))
return false;
if (CreateTemporaryFileInDir(*path, &temp_file)) {
*path = temp_file;
return true;
}
return false;
}
FILE* CreateAndOpenTemporaryShmemFile(FilePath* path) {
base::ThreadRestrictions::AssertIOAllowed();
return CreateAndOpenTemporaryFile(path);
}
// 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) {
base::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) {
base::ThreadRestrictions::AssertIOAllowed();
wchar_t temp_name[MAX_PATH + 1];
if (!GetTempFileName(dir.value().c_str(), L"", 0, temp_name)) {
PLOG(WARNING) << "Failed to get temporary file name in " << dir.value();
return false;
}
DWORD path_len = GetLongPathName(temp_name, temp_name, MAX_PATH);
if (path_len > MAX_PATH + 1 || path_len == 0) {
PLOG(WARNING) << "Failed to get long path name for " << temp_name;
return false;
}
std::wstring temp_file_str;
temp_file_str.assign(temp_name, path_len);
*temp_file = FilePath(temp_file_str);
return true;
}
bool CreateTemporaryDirInDir(const FilePath& base_dir,
const FilePath::StringType& prefix,
FilePath* new_dir) {
base::ThreadRestrictions::AssertIOAllowed();
FilePath path_to_create;
srand(static_cast<uint32>(time(NULL)));
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.
path_to_create = base_dir;
string16 new_dir_name;
new_dir_name.assign(prefix);
new_dir_name.append(base::IntToString16(rand() % kint16max));
path_to_create = path_to_create.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) {
base::ThreadRestrictions::AssertIOAllowed();
FilePath system_temp_dir;
if (!GetTempDir(&system_temp_dir))
return false;
return CreateTemporaryDirInDir(system_temp_dir, prefix, new_temp_path);
}
bool CreateDirectory(const FilePath& full_path) {
base::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;
}
LOG(WARNING) << "CreateDirectory(" << full_path_str << "), "
<< "conflicts with existing file.";
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()) {
return false;
}
if (!CreateDirectory(parent_path)) {
DLOG(WARNING) << "Failed to create one of the parent directories.";
return false;
}
if (!::CreateDirectory(full_path_str, NULL)) {
DWORD error_code = ::GetLastError();
if (error_code == ERROR_ALREADY_EXISTS && DirectoryExists(full_path)) {
// This error code doesn't indicate whether we were racing with someone
// creating the same directory, or a file with the same path, therefore
// we check.
return true;
} else {
LOG(WARNING) << "Failed to create directory " << full_path_str
<< ", last error is " << error_code << ".";
return false;
}
} else {
return true;
}
}
bool GetFileInfo(const FilePath& file_path, base::PlatformFileInfo* results) {
base::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 = base::Time::FromFileTime(attr.ftLastWriteTime);
results->last_accessed = base::Time::FromFileTime(attr.ftLastAccessTime);
results->creation_time = base::Time::FromFileTime(attr.ftCreationTime);
return true;
}
FILE* OpenFile(const FilePath& filename, const char* mode) {
base::ThreadRestrictions::AssertIOAllowed();
std::wstring w_mode = ASCIIToWide(std::string(mode));
return _wfsopen(filename.value().c_str(), w_mode.c_str(), _SH_DENYNO);
}
FILE* OpenFile(const std::string& filename, const char* mode) {
base::ThreadRestrictions::AssertIOAllowed();
return _fsopen(filename.c_str(), mode, _SH_DENYNO);
}
int ReadFile(const FilePath& filename, char* data, int size) {
base::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, size, &read, NULL) &&
static_cast<int>(read) == size)
return read;
return -1;
}
int WriteFile(const FilePath& filename, const char* data, int size) {
base::ThreadRestrictions::AssertIOAllowed();
base::win::ScopedHandle file(CreateFile(filename.value().c_str(),
GENERIC_WRITE,
0,
NULL,
CREATE_ALWAYS,
0,
NULL));
if (!file) {
LOG(WARNING) << "CreateFile failed for path " << filename.value() <<
" error code=" << GetLastError() <<
" error text=" << win_util::FormatLastWin32Error();
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.
LOG(WARNING) << "writing file " << filename.value() <<
" failed, error code=" << GetLastError() <<
" description=" << win_util::FormatLastWin32Error();
} else {
// Didn't write all the bytes.
LOG(WARNING) << "wrote" << written << " bytes to " <<
filename.value() << " expected " << size;
}
return -1;
}
bool RenameFileAndResetSecurityDescriptor(const FilePath& source_file_path,
const FilePath& target_file_path) {
base::ThreadRestrictions::AssertIOAllowed();
// The parameters to SHFileOperation must be terminated with 2 NULL chars.
std::wstring source = source_file_path.value();
std::wstring target = target_file_path.value();
source.append(1, L'\0');
target.append(1, L'\0');
SHFILEOPSTRUCT move_info = {0};
move_info.wFunc = FO_MOVE;
move_info.pFrom = source.c_str();
move_info.pTo = target.c_str();
move_info.fFlags = FOF_SILENT | FOF_NOCONFIRMATION | FOF_NOERRORUI |
FOF_NOCONFIRMMKDIR | FOF_NOCOPYSECURITYATTRIBS;
if (0 != SHFileOperation(&move_info))
return false;
return true;
}
// Gets the current working directory for the process.
bool GetCurrentDirectory(FilePath* dir) {
base::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) {
base::ThreadRestrictions::AssertIOAllowed();
BOOL ret = ::SetCurrentDirectory(directory.value().c_str());
return ret != 0;
}
///////////////////////////////////////////////
// FileEnumerator
FileEnumerator::FileEnumerator(const FilePath& root_path,
bool recursive,
FileEnumerator::FILE_TYPE file_type)
: recursive_(recursive),
file_type_(file_type),
has_find_data_(false),
find_handle_(INVALID_HANDLE_VALUE) {
// INCLUDE_DOT_DOT must not be specified if recursive.
DCHECK(!(recursive && (INCLUDE_DOT_DOT & file_type_)));
pending_paths_.push(root_path);
}
FileEnumerator::FileEnumerator(const FilePath& root_path,
bool recursive,
FileEnumerator::FILE_TYPE file_type,
const FilePath::StringType& pattern)
: recursive_(recursive),
file_type_(file_type),
has_find_data_(false),
pattern_(pattern),
find_handle_(INVALID_HANDLE_VALUE) {
// INCLUDE_DOT_DOT must not be specified if recursive.
DCHECK(!(recursive && (INCLUDE_DOT_DOT & file_type_)));
pending_paths_.push(root_path);
}
FileEnumerator::~FileEnumerator() {
if (find_handle_ != INVALID_HANDLE_VALUE)
FindClose(find_handle_);
}
void FileEnumerator::GetFindInfo(FindInfo* info) {
DCHECK(info);
if (!has_find_data_)
return;
memcpy(info, &find_data_, sizeof(*info));
}
bool FileEnumerator::IsDirectory(const FindInfo& info) {
return (info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0;
}
// static
FilePath FileEnumerator::GetFilename(const FindInfo& find_info) {
return FilePath(find_info.cFileName);
}
FilePath FileEnumerator::Next() {
base::ThreadRestrictions::AssertIOAllowed();
while (has_find_data_ || !pending_paths_.empty()) {
if (!has_find_data_) {
// The last find FindFirstFile operation is done, prepare a new one.
root_path_ = pending_paths_.top();
pending_paths_.pop();
// Start a new find operation.
FilePath src = root_path_;
if (pattern_.empty())
src = src.Append(L"*"); // No pattern = match everything.
else
src = src.Append(pattern_);
find_handle_ = FindFirstFile(src.value().c_str(), &find_data_);
has_find_data_ = true;
} else {
// Search for the next file/directory.
if (!FindNextFile(find_handle_, &find_data_)) {
FindClose(find_handle_);
find_handle_ = INVALID_HANDLE_VALUE;
}
}
if (INVALID_HANDLE_VALUE == find_handle_) {
has_find_data_ = false;
// This is reached when we have finished a directory and are advancing to
// the next one in the queue. We applied the pattern (if any) to the files
// in the root search directory, but for those directories which were
// matched, we want to enumerate all files inside them. This will happen
// when the handle is empty.
pattern_ = FilePath::StringType();
continue;
}
FilePath cur_file(find_data_.cFileName);
if (ShouldSkip(cur_file))
continue;
// Construct the absolute filename.
cur_file = root_path_.Append(find_data_.cFileName);
if (find_data_.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
if (recursive_) {
// If |cur_file| is a directory, and we are doing recursive searching,
// add it to pending_paths_ so we scan it after we finish scanning this
// directory.
pending_paths_.push(cur_file);
}
if (file_type_ & FileEnumerator::DIRECTORIES)
return cur_file;
} else if (file_type_ & FileEnumerator::FILES)
return cur_file;
}
return FilePath();
}
///////////////////////////////////////////////
// MemoryMappedFile
MemoryMappedFile::MemoryMappedFile()
: file_(INVALID_HANDLE_VALUE),
file_mapping_(INVALID_HANDLE_VALUE),
data_(NULL),
length_(INVALID_FILE_SIZE) {
}
bool MemoryMappedFile::MapFileToMemoryInternal() {
base::ThreadRestrictions::AssertIOAllowed();
if (file_ == INVALID_HANDLE_VALUE)
return false;
length_ = ::GetFileSize(file_, NULL);
if (length_ == INVALID_FILE_SIZE)
return false;
// length_ value comes from GetFileSize() above. GetFileSize() returns DWORD,
// therefore the cast here is safe.
file_mapping_ = ::CreateFileMapping(file_, NULL, PAGE_READONLY,
0, static_cast<DWORD>(length_), NULL);
if (!file_mapping_) {
// According to msdn, system error codes are only reserved up to 15999.
// http://msdn.microsoft.com/en-us/library/ms681381(v=VS.85).aspx.
UMA_HISTOGRAM_ENUMERATION("MemoryMappedFile.CreateFileMapping",
logging::GetLastSystemErrorCode(), 16000);
return false;
}
data_ = static_cast<uint8*>(
::MapViewOfFile(file_mapping_, FILE_MAP_READ, 0, 0, length_));
if (!data_) {
UMA_HISTOGRAM_ENUMERATION("MemoryMappedFile.MapViewOfFile",
logging::GetLastSystemErrorCode(), 16000);
}
return data_ != NULL;
}
void MemoryMappedFile::CloseHandles() {
if (data_)
::UnmapViewOfFile(data_);
if (file_mapping_ != INVALID_HANDLE_VALUE)
::CloseHandle(file_mapping_);
if (file_ != INVALID_HANDLE_VALUE)
::CloseHandle(file_);
data_ = NULL;
file_mapping_ = file_ = INVALID_HANDLE_VALUE;
length_ = INVALID_FILE_SIZE;
}
bool HasFileBeenModifiedSince(const FileEnumerator::FindInfo& find_info,
const base::Time& cutoff_time) {
base::ThreadRestrictions::AssertIOAllowed();
long result = CompareFileTime(&find_info.ftLastWriteTime,
&cutoff_time.ToFileTime());
return result == 1 || result == 0;
}