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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"
/* this function expects a name at the top of the stack and the winres table next */
static int luaC_registerPreloader_(lua_State* L)
{
const int oldTop = lua_gettop(L);
/*
[-2] winres
[-1] name:lower()
*/
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;
}
/*
[-3] winres
[-2] name:lower()
[-1] package
*/
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;
}
/*
[-4] winres
[-3] name:lower()
[-2] package
[-1] package.preload
*/
lua_pushvalue(L, -3);
lua_getfield(L, -5, 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;
}
/*
[-6] winres
[-5] name:lower()
[-4] package
[-3] package.preload [t]
[-2] name:lower() [k]
[-1] winres.c_loader [v]
*/
lua_rawset(L, -3); /* t[k] = v */
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 stktop = lua_gettop(L);
const int winresidx = -2;
LPCSTR lpszNameLower = NULL;
lua_pushtstring_lowercase(L, lpszName); /* name:lower() */
lpszNameLower = lua_tostring(L, -1);
if (!lpszNameLower)
{
lua_pushstring(L, "Could not convert lowercase name to string.");
return FALSE;
}
/* Expecting the winres table at index winresidx 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))
{
/* we expect a string on the stack here ... don't do anything additional */
return FALSE;
}
lua_getfield(L, winresidx, W32RES_SCRIPTS);
if(!lua_istable(L, -1))
{
lua_pushfstring(L, "Not a table at index %i. Expected '%s.%s' table here.", -1, W32RES_MODNAME, W32RES_SCRIPTS);
return FALSE;
}
lua_pushvalue(L, -2);
lua_pushtstring(L, lpszType);
/*
[-5] winres
[-4] name:lower()
[-3] winres.scripts [t]
[-2] name:lower() [k]
[-1] type [v]
*/
lua_rawset(L, -3); /* t[k] = v */
lua_settop(L, stktop);
}
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;
}
/*
this function leaves the winres table at the top of the stack
if it fails, it returns 1 and leaves an addition string value on the stack
*/
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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