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+/***************************************************************************
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+ * _ _ ____ _
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+ * Project ___| | | | _ \| |
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+ * / __| | | | |_) | |
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+ * | (__| |_| | _ <| |___
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+ * \___|\___/|_| \_\_____|
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+ *
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+ * Copyright (C) 2016, Steve Holme, <steve_holme@hotmail.com>.
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+ *
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+ * This software is licensed as described in the file COPYING, which
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+ * you should have received as part of this distribution. The terms
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+ * are also available at https://curl.haxx.se/docs/copyright.html.
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+ *
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+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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+ * copies of the Software, and permit persons to whom the Software is
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+ * furnished to do so, under the terms of the COPYING file.
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+ *
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+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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+ * KIND, either express or implied.
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+ *
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+ ***************************************************************************/
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+
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+#include "curl_setup.h"
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+
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+#if defined(WIN32)
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+
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+#if defined(USE_WINDOWS_SSPI) || (!defined(CURL_DISABLE_TELNET) && \
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+ defined(USE_WINSOCK))
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+
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+#include <curl/curl.h>
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+#include "system_win32.h"
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+
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+/* The last #include files should be: */
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+#include "curl_memory.h"
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+#include "memdebug.h"
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+
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+#if !defined(LOAD_WITH_ALTERED_SEARCH_PATH)
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+#define LOAD_WITH_ALTERED_SEARCH_PATH 0x00000008
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+#endif
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+
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+#if !defined(LOAD_LIBRARY_SEARCH_SYSTEM32)
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+#define LOAD_LIBRARY_SEARCH_SYSTEM32 0x00000800
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+#endif
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+
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+/* We use our own typedef here since some headers might lack these */
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+typedef HMODULE (APIENTRY *LOADLIBRARYEX_FN)(LPCTSTR, HANDLE, DWORD);
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+
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+/* See function definitions in winbase.h */
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+#ifdef UNICODE
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+# ifdef _WIN32_WCE
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+# define LOADLIBARYEX L"LoadLibraryExW"
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+# else
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+# define LOADLIBARYEX "LoadLibraryExW"
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+# endif
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+#else
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+# define LOADLIBARYEX "LoadLibraryExA"
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+#endif
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+
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+/*
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+ * Curl_load_library()
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+ *
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+ * This is used to dynamically load DLLs using the most secure method available
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+ * for the version of Windows that we are running on.
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+ *
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+ * Parameters:
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+ *
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+ * filename [in] - The filename or full path of the DLL to load. If only the
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+ * filename is passed then the DLL will be loaded from the
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+ * Windows system directory.
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+ *
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+ * Returns the handle of the module on success; otherwise NULL.
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+ */
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+HMODULE Curl_load_library(LPCTSTR filename)
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+{
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+ HMODULE hModule = NULL;
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+ LOADLIBRARYEX_FN pLoadLibraryEx = NULL;
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+
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+ /* Get a handle to kernel32 so we can access it's functions at runtime */
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+ HMODULE hKernel32 = GetModuleHandle(TEXT("kernel32"));
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+ if(!hKernel32)
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+ return NULL;
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+
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+ /* Attempt to find LoadLibraryEx() which is only available on Windows 2000
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+ and above */
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+ pLoadLibraryEx = (LOADLIBRARYEX_FN) GetProcAddress(hKernel32, LOADLIBARYEX);
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+
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+ /* Detect if there's already a path in the filename and load the library if
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+ there is. Note: Both back slashes and forward slashes have been supported
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+ since the earlier days of DOS at an API level although they are not
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+ supported by command prompt */
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+ if(_tcspbrk(filename, TEXT("\\/")))
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+ hModule = pLoadLibraryEx ?
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+ pLoadLibraryEx(filename, NULL, LOAD_WITH_ALTERED_SEARCH_PATH) :
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+ LoadLibrary(filename);
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+ /* Detect if KB2533623 is installed, as LOAD_LIBARY_SEARCH_SYSTEM32 is only
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+ supported on Windows Vista, Windows Server 2008, Windows 7 and Windows
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+ Server 2008 R2 with this patch or natively on Windows 8 and above */
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+ else if(pLoadLibraryEx && GetProcAddress(hKernel32, "AddDllDirectory")) {
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+ /* Load the DLL from the Windows system directory */
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+ hModule = pLoadLibraryEx(filename, NULL, LOAD_LIBRARY_SEARCH_SYSTEM32);
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+ }
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+ else {
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+ /* Attempt to get the Windows system path */
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+ UINT systemdirlen = GetSystemDirectory(NULL, 0);
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+ if(systemdirlen) {
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+ /* Allocate space for the full DLL path (Room for the null terminator
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+ is included in systemdirlen) */
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+ size_t filenamelen = _tcslen(filename);
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+ TCHAR *path = malloc(sizeof(TCHAR) * (systemdirlen + 1 + filenamelen));
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+ if(path && GetSystemDirectory(path, systemdirlen)) {
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+ /* Calculate the full DLL path */
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+ _tcscpy(path + _tcslen(path), TEXT("\\"));
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+ _tcscpy(path + _tcslen(path), filename);
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+
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+ /* Load the DLL from the Windows system directory */
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+ hModule = pLoadLibraryEx ?
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+ pLoadLibraryEx(path, NULL, LOAD_WITH_ALTERED_SEARCH_PATH) :
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+ LoadLibrary(path);
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+
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+ free(path);
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+ }
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+ }
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+ }
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+
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+ return hModule;
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+}
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+
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+#endif /* USE_WINDOWS_SSPI || (!CURL_DISABLE_TELNET && USE_WINSOCK) */
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+
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+#endif /* WIN32 */
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Steve Holme