Fix for compiled scripts in 64 bit server - based on patch from mickdermack

Author: ccw808

src/lundump.c

@@ -27,6 +27,9 @@ void lua_registerUndumpHook ( lua_UndumpHook f )
     pUndumpHook = f;
 }
 
+// precompiled chunk for MTA always uses 4 byte size_t
+#define SIZE_T_PRECOMPILED_CHUNK 4
+
 typedef struct {
  lua_State* L;
  ZIO* Z;
@@ -82,8 +85,12 @@ static lua_Number LoadNumber(LoadState* S)
 
 static TString* LoadString(LoadState* S)
 {
- size_t size;
- LoadVar(S,size);
+ size_t size = 0;
+ if ( sizeof(size_t) <= SIZE_T_PRECOMPILED_CHUNK )
+  LoadVar(S,size);
+ else
+  LoadMem(S,&size,1,SIZE_T_PRECOMPILED_CHUNK);
+
  if (size==0)
   return NULL;
  else
@@ -192,6 +199,8 @@ static void LoadHeader(LoadState* S)
  char h[LUAC_HEADERSIZE];
  char s[LUAC_HEADERSIZE];
  luaU_header(h);
+ if ( h[8] > SIZE_T_PRECOMPILED_CHUNK )
+    h[8] = SIZE_T_PRECOMPILED_CHUNK;
  LoadBlock(S,s,LUAC_HEADERSIZE);
  IF (memcmp(h,s,LUAC_HEADERSIZE)!=0, "bad header");
 }