12089Ssos/*************************************************************************** 2228976Suqs * _ _ ____ _ 32089Ssos * Project ___| | | | _ \| | 42089Ssos * / __| | | | |_) | | 52089Ssos * | (__| |_| | _ <| |___ 62089Ssos * \___|\___/|_| \_\_____| 72089Ssos * 82089Ssos * Copyright (C) 2016 - 2017, Steve Holme, <steve_holme@hotmail.com>. 95994Ssos * Copyright (C) 2017, Expat development team 105994Ssos * 112089Ssos * All rights reserved. 122089Ssos * Licensed under the MIT license: 132089Ssos * 142089Ssos * Permission to use, copy, modify, and distribute this software for any 1597748Sschweikh * purpose with or without fee is hereby granted, provided that the above 162089Ssos * copyright notice and this permission notice appear in all copies. 172089Ssos * 182089Ssos * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 192089Ssos * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 202089Ssos * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF 212089Ssos * THIRD PARTY RIGHTS. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 222089Ssos * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF 232089Ssos * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH 242089Ssos * THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 252089Ssos * 262089Ssos * Except as contained in this notice, the name of a copyright holder shall 272089Ssos * not be used in advertising or otherwise to promote the sale, use or other 282089Ssos * dealings in this Software without prior written authorization of the 2930764Scharnier * copyright holder. 3030764Scharnier * 3150479Speter ***************************************************************************/ 3230764Scharnier 3330764Scharnier#if defined(_WIN32) 342089Ssos 3523457Sbrian#include <windows.h> 3623457Sbrian#include <tchar.h> 372089Ssos 3875344Ssobomax 392089SsosHMODULE _Expat_LoadLibrary(LPCTSTR filename); 4075344Ssobomax 4175344Ssobomax 4275344Ssobomax#if !defined(LOAD_WITH_ALTERED_SEARCH_PATH) 432089Ssos#define LOAD_WITH_ALTERED_SEARCH_PATH 0x00000008 442089Ssos#endif 452089Ssos 462089Ssos#if !defined(LOAD_LIBRARY_SEARCH_SYSTEM32) 472089Ssos#define LOAD_LIBRARY_SEARCH_SYSTEM32 0x00000800 488857Srgrimes#endif 492089Ssos 502089Ssos/* We use our own typedef here since some headers might lack these */ 51140159Sdelphijtypedef HMODULE (APIENTRY *LOADLIBRARYEX_FN)(LPCTSTR, HANDLE, DWORD); 5275344Ssobomax 532089Ssos/* See function definitions in winbase.h */ 542089Ssos#ifdef UNICODE 552089Ssos# ifdef _WIN32_WCE 562089Ssos# define LOADLIBARYEX L"LoadLibraryExW" 572089Ssos# else 5875344Ssobomax# define LOADLIBARYEX "LoadLibraryExW" 5975344Ssobomax# endif 602089Ssos#else 6175344Ssobomax# define LOADLIBARYEX "LoadLibraryExA" 6275344Ssobomax#endif 6375344Ssobomax 642089Ssos 652089Ssos/* 662089Ssos * _Expat_LoadLibrary() 6775344Ssobomax * 682089Ssos * This is used to dynamically load DLLs using the most secure method available 692089Ssos * for the version of Windows that we are running on. 702089Ssos * 7175344Ssobomax * Parameters: 722089Ssos * 732089Ssos * filename [in] - The filename or full path of the DLL to load. If only the 742089Ssos * filename is passed then the DLL will be loaded from the 7575344Ssobomax * Windows system directory. 762089Ssos * 772089Ssos * Returns the handle of the module on success; otherwise NULL. 782089Ssos */ 7975344SsobomaxHMODULE _Expat_LoadLibrary(LPCTSTR filename) 8075344Ssobomax{ 8175344Ssobomax HMODULE hModule = NULL; 8275344Ssobomax LOADLIBRARYEX_FN pLoadLibraryEx = NULL; 8375344Ssobomax 8475344Ssobomax /* Get a handle to kernel32 so we can access it's functions at runtime */ 8575344Ssobomax HMODULE hKernel32 = GetModuleHandle(TEXT("kernel32")); 8675344Ssobomax if(!hKernel32) 8775344Ssobomax return NULL; /* LCOV_EXCL_LINE */ 8875344Ssobomax 8975344Ssobomax /* Attempt to find LoadLibraryEx() which is only available on Windows 2000 9075344Ssobomax and above */ 9175344Ssobomax pLoadLibraryEx = (LOADLIBRARYEX_FN) GetProcAddress(hKernel32, LOADLIBARYEX); 9275344Ssobomax 9375344Ssobomax /* Detect if there's already a path in the filename and load the library if 9475344Ssobomax there is. Note: Both back slashes and forward slashes have been supported 952089Ssos since the earlier days of DOS at an API level although they are not 962089Ssos supported by command prompt */ 972089Ssos if(_tcspbrk(filename, TEXT("\\/"))) { 982089Ssos /** !checksrc! disable BANNEDFUNC 1 **/ 992089Ssos hModule = pLoadLibraryEx ? 100 pLoadLibraryEx(filename, NULL, LOAD_WITH_ALTERED_SEARCH_PATH) : 101 LoadLibrary(filename); 102 } 103 /* Detect if KB2533623 is installed, as LOAD_LIBARY_SEARCH_SYSTEM32 is only 104 supported on Windows Vista, Windows Server 2008, Windows 7 and Windows 105 Server 2008 R2 with this patch or natively on Windows 8 and above */ 106 else if(pLoadLibraryEx && GetProcAddress(hKernel32, "AddDllDirectory")) { 107 /* Load the DLL from the Windows system directory */ 108 hModule = pLoadLibraryEx(filename, NULL, LOAD_LIBRARY_SEARCH_SYSTEM32); 109 } 110 else { 111 /* Attempt to get the Windows system path */ 112 UINT systemdirlen = GetSystemDirectory(NULL, 0); 113 if(systemdirlen) { 114 /* Allocate space for the full DLL path (Room for the null terminator 115 is included in systemdirlen) */ 116 size_t filenamelen = _tcslen(filename); 117 TCHAR *path = malloc(sizeof(TCHAR) * (systemdirlen + 1 + filenamelen)); 118 if(path && GetSystemDirectory(path, systemdirlen)) { 119 /* Calculate the full DLL path */ 120 _tcscpy(path + _tcslen(path), TEXT("\\")); 121 _tcscpy(path + _tcslen(path), filename); 122 123 /* Load the DLL from the Windows system directory */ 124 /** !checksrc! disable BANNEDFUNC 1 **/ 125 hModule = pLoadLibraryEx ? 126 pLoadLibraryEx(path, NULL, LOAD_WITH_ALTERED_SEARCH_PATH) : 127 LoadLibrary(path); 128 129 } 130 free(path); 131 } 132 } 133 134 return hModule; 135} 136 137#else /* defined(_WIN32) */ 138 139/* ISO C requires a translation unit to contain at least one declaration 140 [-Wempty-translation-unit] */ 141typedef int _TRANSLATION_UNIT_LOAD_LIBRARY_C_NOT_EMTPY; 142 143#endif /* defined(_WIN32) */ 144