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///////////////////////////////////////////////////////////////////////////////
///
/// Written 2011-2012, Oliver Schneider (assarbad.net) - PUBLIC DOMAIN/CC0
///
/// Original filename: w32embed.h
/// Project : WinDirStat
/// Author(s) : Oliver Schneider
///
/// Purpose : Lua package to load Lua code from the resource section
/// of a PE file. Skips the UTF-8 BOM (3 bytes), if found.
///
///////////////////////////////////////////////////////////////////////////////
#include <Windows.h>
#include <tchar.h>
#include <lua.h>
#include "w32resembed.h"
static int luaC_registerPreloader_(lua_State* L, const int winresidx, LPCTSTR lpszName)
{
const int oldTop = lua_gettop(L);
UNREFERENCED_PARAMETER(winresidx);
// Expects the winres table at -1
lua_getfield(L, LUA_GLOBALSINDEX, "package");
if(!lua_istable(L, -1))
{
lua_settop(L, oldTop);
lua_pushfstring(L, "Not a table at index %i. Expected '%s' table here.", -1, "package");
return FALSE;
}
lua_getfield(L, -1, "preload");
if(!lua_istable(L, -1))
{
lua_settop(L, oldTop);
lua_pushfstring(L, "Not a table at index %i. Expected '%s.%s' table here.", -1, "package", "preload");
return FALSE;
}
lua_pushtstring(L, lpszName);
lua_getfield(L, -4, W32RES_LOADER); // get registered C function
if(!lua_isfunction(L, -1))
{
lua_settop(L, oldTop);
lua_pushfstring(L, "Not a C function when fetching field '%s.%s'.", W32RES_MODNAME, W32RES_LOADER);
return 1;
}
lua_rawset(L, -3); // package.preload[lpszName] = winres.c_loader
// We checked the parameters already
lua_pushtstring_lowercase(L, lpszName); // lpszName = string:lower(lpszName)
lua_getfield(L, -4, W32RES_LOADER);
lua_rawset(L, -3); // package.preload[lpszName] = winres.c_loader
lua_settop(L, oldTop);
return 0;
}
static BOOL CALLBACK enumLuaScriptsLanguageCallback(HANDLE hModule, LPCTSTR lpszType, LPCTSTR lpszName, WORD wIDLanguage, lua_State* L)
{
UNREFERENCED_PARAMETER(hModule);
UNREFERENCED_PARAMETER(lpszName);
if((0 == lstrcmp(RT_LUASCRIPT,lpszType)) && (LANG_NEUTRAL == PRIMARYLANGID(wIDLanguage)))
{
const int winresidx = -1;
// Expecting the winres table at the top of the stack here
if(!lua_istable(L, winresidx))
{
lua_pushfstring(L, "Not a table at index %i. Expected '%s' table here.", winresidx, W32RES_MODNAME);
return FALSE;
}
// Now register the preloader
if(luaC_registerPreloader_(L, winresidx, lpszName))
{
// we expect a string on the stack here ... don't do anything additional
return FALSE;
}
lua_getfield(L, -1, W32RES_SCRIPTS);
if(!lua_istable(L, -1))
{
lua_pushfstring(L, "Not a table at index %i. Expected '%s.%s' table here.", winresidx, W32RES_MODNAME, W32RES_SCRIPTS);
return FALSE;
}
// winres.scripts at top of stack
lua_pushtstring(L, lpszName);
lua_pushtstring(L, lpszType);
lua_rawset(L, -3); // winres.scripts[lpszName] = lpszType
// now pop one ... (winres.scripts)
lua_pop(L, 1);
}
return TRUE;
}
static BOOL CALLBACK enumLuaScriptsNameCallback(HANDLE hModule, LPCTSTR lpszType, LPCTSTR lpszName, LONG_PTR lParam)
{
lua_State* L = (lua_State*)lParam;
UNREFERENCED_PARAMETER(hModule);
// First string table entry that we encounter will be grabbed
if(0 == lstrcmp(RT_LUASCRIPT,lpszType))
{
// Now enumerate the languages of this entry ...
EnumResourceLanguages((HMODULE)hModule, lpszType, lpszName, (ENUMRESLANGPROC)enumLuaScriptsLanguageCallback, (LONG_PTR)L);
}
return TRUE;
}
static BOOL getResourcePointer(HINSTANCE Instance, LPCTSTR ResName, LPCTSTR ResType, LPVOID* ppRes, DWORD* pdwResSize)
{
if(ppRes && pdwResSize)
{
HRSRC hRsrc;
if(NULL != (hRsrc = FindResource((HMODULE)Instance, ResName, ResType)))
{
HGLOBAL hGlob;
if(NULL != (hGlob = LoadResource(Instance, hRsrc)))
{
*ppRes = LockResource(hGlob);
*pdwResSize = SizeofResource(Instance, hRsrc);
return (*ppRes && *pdwResSize);
}
}
}
return FALSE;
}
static HMODULE getMyModuleHandle()
{
static int s_somevar = 0;
MEMORY_BASIC_INFORMATION mbi;
if(!VirtualQuery(&s_somevar, &mbi, sizeof(mbi)))
{
return NULL;
}
return (HMODULE)mbi.AllocationBase;
}
static int luaC_winres_loader_(lua_State* L)
{
const BYTE utf8bom[3] = { 0xEF, 0xBB, 0xBF };
const char* scriptBuf = NULL;
size_t scriptLen = 0;
DWORD dwScriptLen = 0;
int ret;
LPCTSTR resName;
LPCSTR chunkName;
// Expecting char string here (used as chunk name)
chunkName = lua_checkstring(L, 1);
// Take a copy on the stack
lua_pushstring(L, chunkName);
// Converts the copy to a wchar_t string
resName = lua_checktstring(L, 2);
// Get pointer to script contents and size of script from current module
if(
!getResourcePointer(getMyModuleHandle(), resName, RT_LUASCRIPT, ((LPVOID*)&scriptBuf), &dwScriptLen)
|| !dwScriptLen
)
{
luaL_error(L, "Could not load the Lua script from the resources: %s", chunkName);
return 0;
}
scriptLen = (size_t)dwScriptLen;
// Skip the UTF-8 BOM, if any
if((scriptLen > sizeof(utf8bom)) && 0 == memcmp(utf8bom, scriptBuf, sizeof(utf8bom)))
{
scriptBuf += sizeof(utf8bom);
scriptLen -= sizeof(utf8bom);
dwScriptLen -= sizeof(utf8bom);
}
// Load the script into the Lua state
if(0 != (ret = luaL_loadbuffer(L, scriptBuf, scriptLen, chunkName)))
{
luaL_error(L, "Could not load Lua chunk from resource (%d): %s", ret, lua_tostring(L, -1));
return 0;
}
// the loaded script is at the top of the stack
lua_remove(L, 2); // remove the chunk name now
lua_pushtstring(L, resName);
if(0 != (ret = lua_pcall(L, 1, LUA_MULTRET, 0)))
{
luaL_error(L, "Could not call the newly loaded chunk (%d): %s", ret, lua_tostring(L, -1));
}
return ret;
}
int w32res_enumerateEmbeddedLuaScripts(lua_State* L)
{
const luaL_Reg winres_funcs[] = {
{W32RES_LOADER, luaC_winres_loader_},
{NULL, NULL}
};
luaL_register(L, W32RES_MODNAME, winres_funcs);
// winres table at top of stack
// Name for the contained table
lua_pushstring(L, W32RES_SCRIPTS);
// winres.scripts (later)
lua_newtable(L);
// Assign the table as winres.scripts
lua_rawset(L, -3);
// Enumerate the resource names of type RT_LUASCRIPT in the current module
// The callback functions add the names of resources to the table at the top of the stack
(void)EnumResourceNames(getMyModuleHandle(), RT_LUASCRIPT, (ENUMRESNAMEPROC)enumLuaScriptsNameCallback, (LONG_PTR)L);
if(lua_isstring(L, -1))
{
// Leave error message at top of stack
return 1;
}
// leave the winres table on the stack
return 0;
}
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