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rufus/src/registry.h

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/*
* Rufus: The Reliable USB Formatting Utility
* Registry access
* Copyright © 2012-2015 Pete Batard <pete@akeo.ie>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <windows.h>
#include <stdint.h>
#include "rufus.h"
#pragma once
#ifdef __cplusplus
extern "C" {
#endif
#define REGKEY_HKCU HKEY_CURRENT_USER
#define REGKEY_HKLM HKEY_LOCAL_MACHINE
/* Delete a registry key from <key_root>\Software and all its values
If the key has subkeys, this call will fail. */
static __inline BOOL DeleteRegistryKey(HKEY key_root, const char* key_name)
{
HKEY hSoftware = NULL;
LONG s;
if (RegOpenKeyExA(key_root, "SOFTWARE", 0, KEY_READ|KEY_CREATE_SUB_KEY, &hSoftware) != ERROR_SUCCESS) {
return FALSE;
}
s = RegDeleteKeyA(hSoftware, key_name);
if ((s != ERROR_SUCCESS) && (s != ERROR_FILE_NOT_FOUND)) {
SetLastError(s);
uprintf("Failed to delete registry key HKCU\\Software\\%s: %s", key_name,
(s == ERROR_ACCESS_DENIED)?"Key is not empty":WindowsErrorString());
}
RegCloseKey(hSoftware);
return ((s == ERROR_SUCCESS) || (s == ERROR_FILE_NOT_FOUND));
}
/* Read a generic registry key value. If a short key_name is used, assume that it belongs to
the application and create the app subkey if required */
static __inline BOOL _GetRegistryKey(HKEY key_root, const char* key_name, DWORD reg_type, LPBYTE dest, DWORD dest_size)
{
BOOL r = FALSE;
size_t i = 0;
LONG s;
HKEY hSoftware = NULL, hApp = NULL;
DWORD dwDisp, dwType = -1, dwSize = dest_size;
// VS Code Analysis complains if we don't break our initialization into chars
char long_key_name[256] = { 0 };
memset(dest, 0, dest_size);
if (key_name == NULL)
return FALSE;
for (i=safe_strlen(key_name); i>0; i--) {
if (key_name[i] == '\\')
break;
}
if (i != 0) {
strcpy(long_key_name, "SOFTWARE\\");
safe_strcat(long_key_name, sizeof(long_key_name), key_name);
long_key_name[sizeof("SOFTWARE\\") + i-1] = 0;
i++;
if (RegOpenKeyExA(key_root, long_key_name, 0, KEY_READ, &hApp) != ERROR_SUCCESS) {
hApp = NULL;
goto out;
}
} else {
if (RegOpenKeyExA(key_root, "SOFTWARE", 0, KEY_READ|KEY_CREATE_SUB_KEY, &hSoftware) != ERROR_SUCCESS) {
hSoftware = NULL;
goto out;
}
if (RegCreateKeyExA(hSoftware, COMPANY_NAME "\\" APPLICATION_NAME, 0, NULL, 0,
KEY_SET_VALUE | KEY_QUERY_VALUE | KEY_CREATE_SUB_KEY, NULL, &hApp, &dwDisp) != ERROR_SUCCESS) {
hApp = NULL;
goto out;
}
}
s = RegQueryValueExA(hApp, &key_name[i], NULL, &dwType, (LPBYTE)dest, &dwSize);
// No key means default value of 0 or empty string
if ((s == ERROR_FILE_NOT_FOUND) || ((s == ERROR_SUCCESS) && (dwType = reg_type) && (dwSize > 0))) {
r = TRUE;
}
out:
if (hSoftware != NULL)
RegCloseKey(hSoftware);
if (hApp != NULL)
RegCloseKey(hApp);
return r;
}
/* Write a generic registry key value (create the key if it doesn't exist) */
static __inline BOOL _SetRegistryKey(HKEY key_root, const char* key_name, DWORD reg_type, LPBYTE src, DWORD src_size)
{
BOOL r = FALSE;
HKEY hSoftware = NULL, hApp = NULL;
DWORD dwDisp, dwType = reg_type;
if (RegOpenKeyExA(key_root, "SOFTWARE", 0, KEY_READ|KEY_CREATE_SUB_KEY, &hSoftware) != ERROR_SUCCESS) {
hSoftware = NULL;
goto out;
}
if (RegCreateKeyExA(hSoftware, COMPANY_NAME "\\" APPLICATION_NAME, 0, NULL, 0,
KEY_SET_VALUE|KEY_QUERY_VALUE|KEY_CREATE_SUB_KEY, NULL, &hApp, &dwDisp) != ERROR_SUCCESS) {
hApp = NULL;
goto out;
}
r = (RegSetValueExA(hApp, key_name, 0, dwType, src, src_size) == ERROR_SUCCESS);
out:
if (hSoftware != NULL)
RegCloseKey(hSoftware);
if (hApp != NULL)
RegCloseKey(hApp);
return r;
}
/* Helpers for 64 bit registry operations */
#define GetRegistryKey64(root, key, pval) _GetRegistryKey(root, key, REG_QWORD, (LPBYTE)pval, sizeof(LONGLONG))
#define SetRegistryKey64(root, key, val) _SetRegistryKey(root, key, REG_QWORD, (LPBYTE)&val, sizeof(LONGLONG))
// Check that a key is accessible for R/W (will create a key if not already existing)
static __inline BOOL CheckRegistryKey64(HKEY root, const char* key) {
LONGLONG val;
return GetRegistryKey64(root, key, &val);
}
static __inline int64_t ReadRegistryKey64(HKEY root, const char* key) {
LONGLONG val;
GetRegistryKey64(root, key, &val);
return (int64_t)val;
}
static __inline BOOL WriteRegistryKey64(HKEY root, const char* key, int64_t val) {
LONGLONG tmp = (LONGLONG)val;
return SetRegistryKey64(root, key, tmp);
}
/* Helpers for 32 bit registry operations */
#define GetRegistryKey32(root, key, pval) _GetRegistryKey(root, key, REG_DWORD, (LPBYTE)pval, sizeof(DWORD))
#define SetRegistryKey32(root, key, val) _SetRegistryKey(root, key, REG_DWORD, (LPBYTE)&val, sizeof(DWORD))
static __inline BOOL CheckRegistryKey32(HKEY root, const char* key) {
DWORD val;
return (GetRegistryKey32(root, key, &val) && SetRegistryKey32(root, key, val));
}
static __inline int32_t ReadRegistryKey32(HKEY root, const char* key) {
DWORD val;
GetRegistryKey32(root, key, &val);
return (int32_t)val;
}
static __inline BOOL WriteRegistryKey32(HKEY root, const char* key, int32_t val) {
DWORD tmp = (DWORD)val;
return SetRegistryKey32(root, key, tmp);
}
/* Helpers for boolean registry operations */
#define ReadRegistryKeyBool(root, key) (ReadRegistryKey32(root, key) != 0)
#define WriteRegistryKeyBool(root, key, b) WriteRegistryKey32(root, key, (b)?1:0)
#define CheckRegistryKeyBool CheckRegistryKey32
/* Helpers for String registry operations */
#define GetRegistryKeyStr(root, key, str, len) _GetRegistryKey(root, key, REG_SZ, (LPBYTE)str, (DWORD)len)
#define SetRegistryKeyStr(root, key, str) _SetRegistryKey(root, key, REG_SZ, (LPBYTE)str, (DWORD)safe_strlen(str))
// Use a static buffer - don't allocate
static __inline char* ReadRegistryKeyStr(HKEY root, const char* key) {
static char str[512];
str[0] = 0;
_GetRegistryKey(root, key, REG_SZ, (LPBYTE)str, (DWORD)sizeof(str)-1);
return str;
}
#define WriteRegistryKeyStr SetRegistryKeyStr
#ifdef __cplusplus
}
#endif