From 5b39dc76f1bc82f941d5c800ab9f34407a06b53a Mon Sep 17 00:00:00 2001
From: Igor Pavlov <87184205+ip7z@users.noreply.github.com>
Date: Wed, 21 Jun 2023 00:00:00 +0000
Subject: 23.01

---
 C/DllSecur.c | 127 +++++++++++++++++++++++++++++------------------------------
 1 file changed, 62 insertions(+), 65 deletions(-)

(limited to 'C/DllSecur.c')

diff --git a/C/DllSecur.c b/C/DllSecur.c
index dce0c96..02a0f97 100644
--- a/C/DllSecur.c
+++ b/C/DllSecur.c
@@ -1,18 +1,28 @@
 /* DllSecur.c -- DLL loading security
-2022-07-15 : Igor Pavlov : Public domain */
+2023-04-02 : Igor Pavlov : Public domain */
 
 #include "Precomp.h"
 
 #ifdef _WIN32
 
-#include <Windows.h>
+#include "7zWindows.h"
 
 #include "DllSecur.h"
 
 #ifndef UNDER_CE
 
-#if defined(__GNUC__) && (__GNUC__ >= 8)
-  #pragma GCC diagnostic ignored "-Wcast-function-type"
+#if (defined(__GNUC__) && (__GNUC__ >= 8)) || defined(__clang__)
+  // #pragma GCC diagnostic ignored "-Wcast-function-type"
+#endif
+
+#if defined(__clang__) || defined(__GNUC__)
+typedef void (*Z7_voidFunction)(void);
+#define MY_CAST_FUNC (Z7_voidFunction)
+#elif defined(_MSC_VER) && _MSC_VER > 1920
+#define MY_CAST_FUNC  (void *)
+// #pragma warning(disable : 4191) // 'type cast': unsafe conversion from 'FARPROC' to 'void (__cdecl *)()'
+#else
+#define MY_CAST_FUNC
 #endif
 
 typedef BOOL (WINAPI *Func_SetDefaultDllDirectories)(DWORD DirectoryFlags);
@@ -20,95 +30,82 @@ typedef BOOL (WINAPI *Func_SetDefaultDllDirectories)(DWORD DirectoryFlags);
 #define MY_LOAD_LIBRARY_SEARCH_USER_DIRS 0x400
 #define MY_LOAD_LIBRARY_SEARCH_SYSTEM32  0x800
 
+#define DELIM "\0"
+
 static const char * const g_Dlls =
+         "userenv"
+  DELIM  "setupapi"
+  DELIM  "apphelp"
+  DELIM  "propsys"
+  DELIM  "dwmapi"
+  DELIM  "cryptbase"
+  DELIM  "oleacc"
+  DELIM  "clbcatq"
+  DELIM  "version"
   #ifndef _CONSOLE
-  "UXTHEME\0"
+  DELIM  "uxtheme"
   #endif
-  "USERENV\0"
-  "SETUPAPI\0"
-  "APPHELP\0"
-  "PROPSYS\0"
-  "DWMAPI\0"
-  "CRYPTBASE\0"
-  "OLEACC\0"
-  "CLBCATQ\0"
-  "VERSION\0"
-  ;
+  DELIM;
 
 #endif
 
-// #define MY_CAST_FUNC  (void(*)())
-#define MY_CAST_FUNC
+#ifdef __clang__
+  #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+#endif
+#if defined (_MSC_VER) && _MSC_VER >= 1900
+// sysinfoapi.h: kit10: GetVersion was declared deprecated
+#pragma warning(disable : 4996)
+#endif
+
+#define IF_NON_VISTA_SET_DLL_DIRS_AND_RETURN \
+    if ((UInt16)GetVersion() != 6) { \
+      const \
+       Func_SetDefaultDllDirectories setDllDirs = \
+      (Func_SetDefaultDllDirectories) MY_CAST_FUNC GetProcAddress(GetModuleHandle(TEXT("kernel32.dll")), \
+           "SetDefaultDllDirectories"); \
+      if (setDllDirs) if (setDllDirs(MY_LOAD_LIBRARY_SEARCH_SYSTEM32 | MY_LOAD_LIBRARY_SEARCH_USER_DIRS)) return; }
 
-void My_SetDefaultDllDirectories()
+void My_SetDefaultDllDirectories(void)
 {
   #ifndef UNDER_CE
-  
-    OSVERSIONINFO vi;
-    vi.dwOSVersionInfoSize = sizeof(vi);
-    if (!GetVersionEx(&vi) || vi.dwMajorVersion != 6 || vi.dwMinorVersion != 0)
-    {
-      Func_SetDefaultDllDirectories setDllDirs = (Func_SetDefaultDllDirectories)
-          MY_CAST_FUNC GetProcAddress(GetModuleHandle(TEXT("kernel32.dll")), "SetDefaultDllDirectories");
-      if (setDllDirs)
-        if (setDllDirs(MY_LOAD_LIBRARY_SEARCH_SYSTEM32 | MY_LOAD_LIBRARY_SEARCH_USER_DIRS))
-          return;
-    }
-
+  IF_NON_VISTA_SET_DLL_DIRS_AND_RETURN
   #endif
 }
 
 
-void LoadSecurityDlls()
+void LoadSecurityDlls(void)
 {
   #ifndef UNDER_CE
-  
-  wchar_t buf[MAX_PATH + 100];
-
-  {
-    // at Vista (ver 6.0) : CoCreateInstance(CLSID_ShellLink, ...) doesn't work after SetDefaultDllDirectories() : Check it ???
-    OSVERSIONINFO vi;
-    vi.dwOSVersionInfoSize = sizeof(vi);
-    if (!GetVersionEx(&vi) || vi.dwMajorVersion != 6 || vi.dwMinorVersion != 0)
-    {
-      Func_SetDefaultDllDirectories setDllDirs = (Func_SetDefaultDllDirectories)
-          MY_CAST_FUNC GetProcAddress(GetModuleHandle(TEXT("kernel32.dll")), "SetDefaultDllDirectories");
-      if (setDllDirs)
-        if (setDllDirs(MY_LOAD_LIBRARY_SEARCH_SYSTEM32 | MY_LOAD_LIBRARY_SEARCH_USER_DIRS))
-          return;
-    }
-  }
-
-  {
-    unsigned len = GetSystemDirectoryW(buf, MAX_PATH + 2);
-    if (len == 0 || len > MAX_PATH)
-      return;
-  }
+  // at Vista (ver 6.0) : CoCreateInstance(CLSID_ShellLink, ...) doesn't work after SetDefaultDllDirectories() : Check it ???
+  IF_NON_VISTA_SET_DLL_DIRS_AND_RETURN
   {
+    wchar_t buf[MAX_PATH + 100];
     const char *dll;
-    unsigned pos = (unsigned)lstrlenW(buf);
-
+    unsigned pos = GetSystemDirectoryW(buf, MAX_PATH + 2);
+    if (pos == 0 || pos > MAX_PATH)
+      return;
     if (buf[pos - 1] != '\\')
       buf[pos++] = '\\';
-    
-    for (dll = g_Dlls; dll[0] != 0;)
+    for (dll = g_Dlls; *dll != 0;)
     {
-      unsigned k = 0;
+      wchar_t *dest = &buf[pos];
       for (;;)
       {
-        char c = *dll++;
-        buf[pos + k] = (Byte)c;
-        k++;
+        const char c = *dll++;
         if (c == 0)
           break;
+        *dest++ = (Byte)c;
       }
-
-      lstrcatW(buf, L".dll");
+      dest[0] = '.';
+      dest[1] = 'd';
+      dest[2] = 'l';
+      dest[3] = 'l';
+      dest[4] = 0;
+      // lstrcatW(buf, L".dll");
       LoadLibraryExW(buf, NULL, LOAD_WITH_ALTERED_SEARCH_PATH);
     }
   }
-  
   #endif
 }
 
-#endif
+#endif // _WIN32
-- 
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