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reactos/dll/shellext/shellbtrfs/main.cpp
Victor Perevertkin 194ea909fd
[BTRFS][UBTRFS][SHELLBTRFS] Upgrade to 1.7.2 
CORE-16679
2020-04-23 07:07:36 +03:00

827 lines
23 KiB
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/* Copyright (c) Mark Harmstone 2016-17
*
* This file is part of WinBtrfs.
*
* WinBtrfs is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public Licence as published by
* the Free Software Foundation, either version 3 of the Licence, or
* (at your option) any later version.
*
* WinBtrfs is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public Licence for more details.
*
* You should have received a copy of the GNU Lesser General Public Licence
* along with WinBtrfs. If not, see <http://www.gnu.org/licenses/>. */
#include "shellext.h"
#include <windows.h>
#include <commctrl.h>
#include <strsafe.h>
#include <stddef.h>
#include <stdexcept>
#include "factory.h"
#include "resource.h"
static const GUID CLSID_ShellBtrfsIconHandler = { 0x2690b74f, 0xf353, 0x422d, { 0xbb, 0x12, 0x40, 0x15, 0x81, 0xee, 0xf8, 0xf0 } };
static const GUID CLSID_ShellBtrfsContextMenu = { 0x2690b74f, 0xf353, 0x422d, { 0xbb, 0x12, 0x40, 0x15, 0x81, 0xee, 0xf8, 0xf1 } };
static const GUID CLSID_ShellBtrfsPropSheet = { 0x2690b74f, 0xf353, 0x422d, { 0xbb, 0x12, 0x40, 0x15, 0x81, 0xee, 0xf8, 0xf2 } };
static const GUID CLSID_ShellBtrfsVolPropSheet = { 0x2690b74f, 0xf353, 0x422d, { 0xbb, 0x12, 0x40, 0x15, 0x81, 0xee, 0xf8, 0xf3 } };
#define COM_DESCRIPTION_ICON_HANDLER L"WinBtrfs shell extension (icon handler)"
#define COM_DESCRIPTION_CONTEXT_MENU L"WinBtrfs shell extension (context menu)"
#define COM_DESCRIPTION_PROP_SHEET L"WinBtrfs shell extension (property sheet)"
#define COM_DESCRIPTION_VOL_PROP_SHEET L"WinBtrfs shell extension (volume property sheet)"
#define ICON_OVERLAY_NAME L"WinBtrfs"
typedef enum _PROCESS_DPI_AWARENESS {
PROCESS_DPI_UNAWARE,
PROCESS_SYSTEM_DPI_AWARE,
PROCESS_PER_MONITOR_DPI_AWARE
} PROCESS_DPI_AWARENESS;
typedef ULONG (WINAPI *_RtlNtStatusToDosError)(NTSTATUS Status);
typedef HRESULT (WINAPI *_SetProcessDpiAwareness)(PROCESS_DPI_AWARENESS value);
HMODULE module;
LONG objs_loaded = 0;
void set_dpi_aware() {
_SetProcessDpiAwareness SetProcessDpiAwareness;
HMODULE shcore = LoadLibraryW(L"shcore.dll");
if (!shcore)
return;
SetProcessDpiAwareness = (_SetProcessDpiAwareness)GetProcAddress(shcore, "SetProcessDpiAwareness");
if (!SetProcessDpiAwareness)
return;
SetProcessDpiAwareness(PROCESS_PER_MONITOR_DPI_AWARE);
}
void format_size(uint64_t size, wstring& s, bool show_bytes) {
wstring t, bytes, kb, nb;
WCHAR nb2[255];
ULONG sr;
float f;
NUMBERFMTW fmt;
WCHAR dec[2], thou[4], grouping[64], *c;
#ifdef __REACTOS__
WCHAR buffer[64];
#endif
#ifndef __REACTOS__
nb = to_wstring(size);
#else
swprintf(buffer, L"%I64d", size);
nb = wstring(buffer);
#endif
GetLocaleInfoW(LOCALE_USER_DEFAULT, LOCALE_STHOUSAND, thou, sizeof(thou) / sizeof(WCHAR));
dec[0] = '.'; dec[1] = 0; // not used, but silences gcc warning
fmt.NumDigits = 0;
fmt.LeadingZero = 1;
fmt.lpDecimalSep = dec;
fmt.lpThousandSep = thou;
fmt.NegativeOrder = 0;
// Grouping code copied from dlls/shlwapi/string.c in Wine - thank you
fmt.Grouping = 0;
GetLocaleInfoW(LOCALE_USER_DEFAULT, LOCALE_SGROUPING, grouping, sizeof(grouping) / sizeof(WCHAR));
c = grouping;
while (*c) {
if (*c >= '0' && *c < '9') {
fmt.Grouping *= 10;
fmt.Grouping += *c - '0';
}
c++;
}
if (fmt.Grouping % 10 == 0)
fmt.Grouping /= 10;
else
fmt.Grouping *= 10;
GetNumberFormatW(LOCALE_USER_DEFAULT, 0, nb.c_str(), &fmt, nb2, sizeof(nb2) / sizeof(WCHAR));
if (size < 1024) {
if (!load_string(module, size == 1 ? IDS_SIZE_BYTE : IDS_SIZE_BYTES, t))
throw last_error(GetLastError());
wstring_sprintf(s, t, nb2);
return;
}
if (show_bytes) {
if (!load_string(module, IDS_SIZE_BYTES, t))
throw last_error(GetLastError());
wstring_sprintf(bytes, t, nb2);
}
if (size >= 1152921504606846976) {
sr = IDS_SIZE_EB;
f = (float)size / 1152921504606846976.0f;
} else if (size >= 1125899906842624) {
sr = IDS_SIZE_PB;
f = (float)size / 1125899906842624.0f;
} else if (size >= 1099511627776) {
sr = IDS_SIZE_TB;
f = (float)size / 1099511627776.0f;
} else if (size >= 1073741824) {
sr = IDS_SIZE_GB;
f = (float)size / 1073741824.0f;
} else if (size >= 1048576) {
sr = IDS_SIZE_MB;
f = (float)size / 1048576.0f;
} else {
sr = IDS_SIZE_KB;
f = (float)size / 1024.0f;
}
if (!load_string(module, sr, t))
throw last_error(GetLastError());
if (show_bytes) {
wstring_sprintf(kb, t, f);
if (!load_string(module, IDS_SIZE_LARGE, t))
throw last_error(GetLastError());
wstring_sprintf(s, t, kb.c_str(), bytes.c_str());
} else
wstring_sprintf(s, t, f);
}
wstring format_message(ULONG last_error) {
WCHAR* buf;
wstring s;
if (FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, nullptr,
last_error, 0, (WCHAR*)&buf, 0, nullptr) == 0) {
return L"(error retrieving message)";
}
s = buf;
LocalFree(buf);
// remove trailing newline
while (s.length() > 0 && (s.substr(s.length() - 1, 1) == L"\r" || s.substr(s.length() - 1, 1) == L"\n"))
s = s.substr(0, s.length() - 1);
return s;
}
wstring format_ntstatus(NTSTATUS Status) {
_RtlNtStatusToDosError RtlNtStatusToDosError;
wstring s;
HMODULE ntdll = LoadLibraryW(L"ntdll.dll");
if (!ntdll)
return L"(error loading ntdll.dll)";
RtlNtStatusToDosError = (_RtlNtStatusToDosError)GetProcAddress(ntdll, "RtlNtStatusToDosError");
if (!RtlNtStatusToDosError) {
FreeLibrary(ntdll);
return L"(error loading RtlNtStatusToDosError)";
}
s = format_message(RtlNtStatusToDosError(Status));
FreeLibrary(ntdll);
return s;
}
bool load_string(HMODULE module, UINT id, wstring& s) {
int len;
LPWSTR retstr = nullptr;
len = LoadStringW(module, id, (LPWSTR)&retstr, 0);
if (len == 0)
return false;
s = wstring(retstr, len);
return true;
}
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable: 4996)
#endif
void wstring_sprintf(wstring& s, wstring fmt, ...) {
int len;
va_list args;
va_start(args, fmt);
len = _vsnwprintf(nullptr, 0, fmt.c_str(), args);
if (len == 0)
s = L"";
else {
s.resize(len);
_vsnwprintf((wchar_t*)s.c_str(), len, fmt.c_str(), args);
}
va_end(args);
}
#ifdef _MSC_VER
#pragma warning(pop)
#endif
extern "C" STDAPI DllCanUnloadNow(void) {
return objs_loaded == 0 ? S_OK : S_FALSE;
}
extern "C" STDAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, LPVOID* ppv) {
if (rclsid == CLSID_ShellBtrfsIconHandler) {
Factory* fact = new Factory;
if (!fact)
return E_OUTOFMEMORY;
else {
fact->type = FactoryIconHandler;
return fact->QueryInterface(riid, ppv);
}
} else if (rclsid == CLSID_ShellBtrfsContextMenu) {
Factory* fact = new Factory;
if (!fact)
return E_OUTOFMEMORY;
else {
fact->type = FactoryContextMenu;
return fact->QueryInterface(riid, ppv);
}
} else if (rclsid == CLSID_ShellBtrfsPropSheet) {
Factory* fact = new Factory;
if (!fact)
return E_OUTOFMEMORY;
else {
fact->type = FactoryPropSheet;
return fact->QueryInterface(riid, ppv);
}
} else if (rclsid == CLSID_ShellBtrfsVolPropSheet) {
Factory* fact = new Factory;
if (!fact)
return E_OUTOFMEMORY;
else {
fact->type = FactoryVolPropSheet;
return fact->QueryInterface(riid, ppv);
}
}
return CLASS_E_CLASSNOTAVAILABLE;
}
static void write_reg_key(HKEY root, const wstring& keyname, const WCHAR* val, const wstring& data) {
LONG l;
HKEY hk;
DWORD dispos;
l = RegCreateKeyExW(root, keyname.c_str(), 0, nullptr, 0, KEY_ALL_ACCESS, nullptr, &hk, &dispos);
if (l != ERROR_SUCCESS)
throw string_error(IDS_REGCREATEKEY_FAILED, l);
l = RegSetValueExW(hk, val, 0, REG_SZ, (const BYTE*)data.c_str(), (DWORD)((data.length() + 1) * sizeof(WCHAR)));
if (l != ERROR_SUCCESS)
throw string_error(IDS_REGSETVALUEEX_FAILED, l);
l = RegCloseKey(hk);
if (l != ERROR_SUCCESS)
throw string_error(IDS_REGCLOSEKEY_FAILED, l);
}
static void register_clsid(const GUID clsid, const WCHAR* description) {
WCHAR* clsidstring;
wstring inproc, progid, clsidkeyname;
WCHAR dllpath[MAX_PATH];
StringFromCLSID(clsid, &clsidstring);
try {
#ifndef __REACTOS__
inproc = L"CLSID\\"s + clsidstring + L"\\InprocServer32"s;
progid = L"CLSID\\"s + clsidstring + L"\\ProgId"s;
clsidkeyname = L"CLSID\\"s + clsidstring;
#else
inproc = wstring(L"CLSID\\") + clsidstring + wstring(L"\\InprocServer32");
progid = wstring(L"CLSID\\") + clsidstring + wstring(L"\\ProgId");
clsidkeyname = wstring(L"CLSID\\") + clsidstring;
#endif
write_reg_key(HKEY_CLASSES_ROOT, clsidkeyname, nullptr, description);
GetModuleFileNameW(module, dllpath, sizeof(dllpath) / sizeof(WCHAR));
write_reg_key(HKEY_CLASSES_ROOT, inproc, nullptr, dllpath);
write_reg_key(HKEY_CLASSES_ROOT, inproc, L"ThreadingModel", L"Apartment");
} catch (...) {
CoTaskMemFree(clsidstring);
throw;
}
CoTaskMemFree(clsidstring);
}
// implementation of RegDeleteTreeW, only available from Vista on
static void reg_delete_tree(HKEY hkey, const wstring& keyname) {
HKEY k;
LSTATUS ret;
ret = RegOpenKeyExW(hkey, keyname.c_str(), 0, KEY_READ, &k);
if (ret != ERROR_SUCCESS)
throw last_error(ret);
try {
WCHAR* buf;
ULONG bufsize;
ret = RegQueryInfoKeyW(k, nullptr, nullptr, nullptr, nullptr, &bufsize, nullptr,
nullptr, nullptr, nullptr, nullptr, nullptr);
if (ret != ERROR_SUCCESS)
throw last_error(ret);
bufsize++;
buf = new WCHAR[bufsize];
try {
do {
ULONG size = bufsize;
ret = RegEnumKeyExW(k, 0, buf, &size, nullptr, nullptr, nullptr, nullptr);
if (ret == ERROR_NO_MORE_ITEMS)
break;
else if (ret != ERROR_SUCCESS)
throw last_error(ret);
reg_delete_tree(k, buf);
} while (true);
ret = RegDeleteKeyW(hkey, keyname.c_str());
if (ret != ERROR_SUCCESS)
throw last_error(ret);
} catch (...) {
delete[] buf;
throw;
}
delete[] buf;
} catch (...) {
RegCloseKey(k);
throw;
}
RegCloseKey(k);
}
static void unregister_clsid(const GUID clsid) {
WCHAR* clsidstring;
StringFromCLSID(clsid, &clsidstring);
try {
#ifndef __REACTOS__
reg_delete_tree(HKEY_CLASSES_ROOT, L"CLSID\\"s + clsidstring);
#else
wstring path = wstring(L"CLSID\\") + clsidstring;
reg_delete_tree(HKEY_CLASSES_ROOT, path);
#endif
} catch (...) {
CoTaskMemFree(clsidstring);
throw;
}
CoTaskMemFree(clsidstring);
}
static void reg_icon_overlay(const GUID clsid, const wstring& name) {
WCHAR* clsidstring;
StringFromCLSID(clsid, &clsidstring);
try {
#ifndef __REACTOS__
wstring path = L"Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\ShellIconOverlayIdentifiers\\"s + name;
#else
wstring path = wstring(L"Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\ShellIconOverlayIdentifiers\\") + name;
#endif
write_reg_key(HKEY_LOCAL_MACHINE, path, nullptr, clsidstring);
} catch (...) {
CoTaskMemFree(clsidstring);
throw;
}
CoTaskMemFree(clsidstring);
}
static void unreg_icon_overlay(const wstring& name) {
#ifndef __REACTOS__
reg_delete_tree(HKEY_LOCAL_MACHINE, L"Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\ShellIconOverlayIdentifiers\\"s + name);
#else
wstring path = wstring(L"Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\ShellIconOverlayIdentifiers\\") + name;
reg_delete_tree(HKEY_LOCAL_MACHINE, path);
#endif
}
static void reg_context_menu_handler(const GUID clsid, const wstring& filetype, const wstring& name) {
WCHAR* clsidstring;
StringFromCLSID(clsid, &clsidstring);
try {
#ifndef __REACTOS__
wstring path = filetype + L"\\ShellEx\\ContextMenuHandlers\\"s + name;
#else
wstring path = filetype + wstring(L"\\ShellEx\\ContextMenuHandlers\\") + name;
#endif
write_reg_key(HKEY_CLASSES_ROOT, path, nullptr, clsidstring);
} catch (...) {
CoTaskMemFree(clsidstring);
throw;
}
}
static void unreg_context_menu_handler(const wstring& filetype, const wstring& name) {
#ifndef __REACTOS__
reg_delete_tree(HKEY_CLASSES_ROOT, filetype + L"\\ShellEx\\ContextMenuHandlers\\"s + name);
#else
wstring path = filetype + wstring(L"\\ShellEx\\ContextMenuHandlers\\") + name;
reg_delete_tree(HKEY_CLASSES_ROOT, path);
#endif
}
static void reg_prop_sheet_handler(const GUID clsid, const wstring& filetype, const wstring& name) {
WCHAR* clsidstring;
StringFromCLSID(clsid, &clsidstring);
try {
#ifndef __REACTOS__
wstring path = filetype + L"\\ShellEx\\PropertySheetHandlers\\"s + name;
#else
wstring path = filetype + wstring(L"\\ShellEx\\PropertySheetHandlers\\") + name;
#endif
write_reg_key(HKEY_CLASSES_ROOT, path, nullptr, clsidstring);
} catch (...) {
CoTaskMemFree(clsidstring);
throw;
}
}
static void unreg_prop_sheet_handler(const wstring& filetype, const wstring& name) {
#ifndef __REACTOS__
reg_delete_tree(HKEY_CLASSES_ROOT, filetype + L"\\ShellEx\\PropertySheetHandlers\\"s + name);
#else
wstring path = filetype + wstring(L"\\ShellEx\\PropertySheetHandlers\\") + name;
reg_delete_tree(HKEY_CLASSES_ROOT, path);
#endif
}
extern "C" STDAPI DllRegisterServer(void) {
try {
register_clsid(CLSID_ShellBtrfsIconHandler, COM_DESCRIPTION_ICON_HANDLER);
register_clsid(CLSID_ShellBtrfsContextMenu, COM_DESCRIPTION_CONTEXT_MENU);
register_clsid(CLSID_ShellBtrfsPropSheet, COM_DESCRIPTION_PROP_SHEET);
register_clsid(CLSID_ShellBtrfsVolPropSheet, COM_DESCRIPTION_VOL_PROP_SHEET);
reg_icon_overlay(CLSID_ShellBtrfsIconHandler, ICON_OVERLAY_NAME);
reg_context_menu_handler(CLSID_ShellBtrfsContextMenu, L"Directory\\Background", ICON_OVERLAY_NAME);
reg_context_menu_handler(CLSID_ShellBtrfsContextMenu, L"Folder", ICON_OVERLAY_NAME);
reg_prop_sheet_handler(CLSID_ShellBtrfsPropSheet, L"Folder", ICON_OVERLAY_NAME);
reg_prop_sheet_handler(CLSID_ShellBtrfsPropSheet, L"*", ICON_OVERLAY_NAME);
reg_prop_sheet_handler(CLSID_ShellBtrfsVolPropSheet, L"Drive", ICON_OVERLAY_NAME);
} catch (const exception& e) {
error_message(nullptr, e.what());
return E_FAIL;
}
return S_OK;
}
extern "C" STDAPI DllUnregisterServer(void) {
try {
unreg_prop_sheet_handler(L"Folder", ICON_OVERLAY_NAME);
unreg_prop_sheet_handler(L"*", ICON_OVERLAY_NAME);
unreg_prop_sheet_handler(L"Drive", ICON_OVERLAY_NAME);
unreg_context_menu_handler(L"Folder", ICON_OVERLAY_NAME);
unreg_context_menu_handler(L"Directory\\Background", ICON_OVERLAY_NAME);
unreg_icon_overlay(ICON_OVERLAY_NAME);
unregister_clsid(CLSID_ShellBtrfsVolPropSheet);
unregister_clsid(CLSID_ShellBtrfsPropSheet);
unregister_clsid(CLSID_ShellBtrfsContextMenu);
unregister_clsid(CLSID_ShellBtrfsIconHandler);
} catch (const exception& e) {
error_message(nullptr, e.what());
return E_FAIL;
}
return S_OK;
}
extern "C" STDAPI DllInstall(BOOL bInstall, LPCWSTR pszCmdLine) {
if (bInstall)
return DllRegisterServer();
else
return DllUnregisterServer();
}
extern "C" BOOL APIENTRY DllMain(HANDLE hModule, DWORD dwReason, void* lpReserved) {
if (dwReason == DLL_PROCESS_ATTACH)
module = (HMODULE)hModule;
return true;
}
static void create_subvol(const wstring& fn) {
size_t found = fn.rfind(L"\\");
wstring path, file;
win_handle h;
btrfs_create_subvol* bcs;
IO_STATUS_BLOCK iosb;
if (found == wstring::npos) {
path = L"";
file = fn;
} else {
path = fn.substr(0, found);
file = fn.substr(found + 1);
}
path += L"\\";
h = CreateFileW(path.c_str(), FILE_ADD_SUBDIRECTORY, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, nullptr, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, nullptr);
if (h == INVALID_HANDLE_VALUE)
return;
size_t bcslen = offsetof(btrfs_create_subvol, name[0]) + (file.length() * sizeof(WCHAR));
bcs = (btrfs_create_subvol*)malloc(bcslen);
bcs->readonly = false;
bcs->posix = false;
bcs->namelen = (uint16_t)(file.length() * sizeof(WCHAR));
memcpy(bcs->name, file.c_str(), bcs->namelen);
NtFsControlFile(h, nullptr, nullptr, nullptr, &iosb, FSCTL_BTRFS_CREATE_SUBVOL, bcs, (ULONG)bcslen, nullptr, 0);
}
extern "C" void CALLBACK CreateSubvolW(HWND hwnd, HINSTANCE hinst, LPWSTR lpszCmdLine, int nCmdShow) {
vector<wstring> args;
command_line_to_args(lpszCmdLine, args);
if (args.size() >= 1)
create_subvol(args[0]);
}
static void create_snapshot2(const wstring& source, const wstring& fn) {
size_t found = fn.rfind(L"\\");
wstring path, file;
win_handle h, src;
btrfs_create_snapshot* bcs;
IO_STATUS_BLOCK iosb;
if (found == wstring::npos) {
path = L"";
file = fn;
} else {
path = fn.substr(0, found);
file = fn.substr(found + 1);
}
path += L"\\";
src = CreateFileW(source.c_str(), FILE_TRAVERSE, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, nullptr, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, nullptr);
if (src == INVALID_HANDLE_VALUE)
return;
h = CreateFileW(path.c_str(), FILE_ADD_SUBDIRECTORY, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, nullptr, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, nullptr);
if (h == INVALID_HANDLE_VALUE)
return;
size_t bcslen = offsetof(btrfs_create_snapshot, name[0]) + (file.length() * sizeof(WCHAR));
bcs = (btrfs_create_snapshot*)malloc(bcslen);
bcs->readonly = false;
bcs->posix = false;
bcs->namelen = (uint16_t)(file.length() * sizeof(WCHAR));
memcpy(bcs->name, file.c_str(), bcs->namelen);
bcs->subvol = src;
NtFsControlFile(h, nullptr, nullptr, nullptr, &iosb, FSCTL_BTRFS_CREATE_SNAPSHOT, bcs, (ULONG)bcslen, nullptr, 0);
}
extern "C" void CALLBACK CreateSnapshotW(HWND hwnd, HINSTANCE hinst, LPWSTR lpszCmdLine, int nCmdShow) {
vector<wstring> args;
command_line_to_args(lpszCmdLine, args);
if (args.size() >= 2)
create_snapshot2(args[0], args[1]);
}
void command_line_to_args(LPWSTR cmdline, vector<wstring>& args) {
LPWSTR* l;
int num_args;
args.clear();
l = CommandLineToArgvW(cmdline, &num_args);
if (!l)
return;
try {
args.reserve(num_args);
for (unsigned int i = 0; i < (unsigned int)num_args; i++) {
args.push_back(l[i]);
}
} catch (...) {
LocalFree(l);
throw;
}
LocalFree(l);
}
static string utf16_to_utf8(const wstring_view& utf16) {
string utf8;
char* buf;
if (utf16.empty())
return "";
auto utf8len = WideCharToMultiByte(CP_UTF8, 0, utf16.data(), static_cast<int>(utf16.length()), nullptr, 0, nullptr, nullptr);
if (utf8len == 0)
throw last_error(GetLastError());
buf = (char*)malloc(utf8len + sizeof(char));
if (!buf)
throw string_error(IDS_OUT_OF_MEMORY);
if (WideCharToMultiByte(CP_UTF8, 0, utf16.data(), static_cast<int>(utf16.length()), buf, utf8len, nullptr, nullptr) == 0) {
auto le = GetLastError();
free(buf);
throw last_error(le);
}
buf[utf8len] = 0;
utf8 = buf;
free(buf);
return utf8;
}
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable: 4996)
#endif
string_error::string_error(int resno, ...) {
wstring fmt, s;
int len;
va_list args;
if (!load_string(module, resno, fmt))
throw runtime_error("LoadString failed."); // FIXME
va_start(args, resno);
len = _vsnwprintf(nullptr, 0, fmt.c_str(), args);
if (len == 0)
s = L"";
else {
s.resize(len);
_vsnwprintf((wchar_t*)s.c_str(), len, fmt.c_str(), args);
}
va_end(args);
msg = utf16_to_utf8(s);
}
#ifdef _MSC_VER
#pragma warning(pop)
#endif
wstring utf8_to_utf16(const string_view& utf8) {
wstring ret;
WCHAR* buf;
if (utf8.empty())
return L"";
auto utf16len = MultiByteToWideChar(CP_UTF8, 0, utf8.data(), (int)utf8.length(), nullptr, 0);
if (utf16len == 0)
throw last_error(GetLastError());
buf = (WCHAR*)malloc((utf16len + 1) * sizeof(WCHAR));
if (!buf)
throw string_error(IDS_OUT_OF_MEMORY);
if (MultiByteToWideChar(CP_UTF8, 0, utf8.data(), (int)utf8.length(), buf, utf16len) == 0) {
auto le = GetLastError();
free(buf);
throw last_error(le);
}
buf[utf16len] = 0;
ret = buf;
free(buf);
return ret;
}
last_error::last_error(DWORD errnum) {
WCHAR* buf;
if (FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, nullptr,
errnum, 0, (WCHAR*)&buf, 0, nullptr) == 0)
throw runtime_error("FormatMessage failed");
try {
msg = utf16_to_utf8(buf);
} catch (...) {
LocalFree(buf);
throw;
}
LocalFree(buf);
}
void error_message(HWND hwnd, const char* msg) {
wstring title;
load_string(module, IDS_ERROR, title);
auto wmsg = utf8_to_utf16(msg);
MessageBoxW(hwnd, wmsg.c_str(), title.c_str(), MB_ICONERROR);
}
ntstatus_error::ntstatus_error(NTSTATUS Status) : Status(Status) {
_RtlNtStatusToDosError RtlNtStatusToDosError;
HMODULE ntdll = LoadLibraryW(L"ntdll.dll");
WCHAR* buf;
if (!ntdll)
throw runtime_error("Error loading ntdll.dll.");
try {
RtlNtStatusToDosError = (_RtlNtStatusToDosError)GetProcAddress(ntdll, "RtlNtStatusToDosError");
if (!RtlNtStatusToDosError)
throw runtime_error("Error loading RtlNtStatusToDosError in ntdll.dll.");
if (FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, nullptr,
RtlNtStatusToDosError(Status), 0, (WCHAR*)&buf, 0, nullptr) == 0)
throw runtime_error("FormatMessage failed");
try {
msg = utf16_to_utf8(buf);
} catch (...) {
LocalFree(buf);
throw;
}
LocalFree(buf);
} catch (...) {
FreeLibrary(ntdll);
throw;
}
FreeLibrary(ntdll);
}
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