SWORD25: Added proxy code for converting writing config.lua to update the ScummVM game settings

4 files changed, 251 insertions, 90 deletions

diff --git a/engines/sword25/module.mk b/engines/sword25/module.mk
index da91c848b5..968f21cff5 100644
--- a/engines/sword25/module.mk
+++ b/engines/sword25/module.mk
@@ -83,6 +83,7 @@ MODULE_OBJS := \
 	util/lua/lvm.o \
 	util/lua/lzio.o \
 	util/lua/print.o \
+	util/lua/scummvm_file.o \
 	util/pluto/pdep.o \
 	util/pluto/pluto.o \
 	util/pluto/plzio.o
diff --git a/engines/sword25/util/lua/liolib.cpp b/engines/sword25/util/lua/liolib.cpp
index aea6c328d8..b505d1e4df 100644
--- a/engines/sword25/util/lua/liolib.cpp
+++ b/engines/sword25/util/lua/liolib.cpp
@@ -16,7 +16,8 @@
 
 #include "lauxlib.h"
 #include "lualib.h"
-
+#include "common/textconsole.h"
+#include "scummvm_file.h"
 
 
 #define IO_INPUT	1
@@ -43,47 +44,48 @@ static int pushresult (lua_State *L, int i, const char *filename) {
   }
 }
 
-
+/*
 static void fileerror (lua_State *L, int arg, const char *filename) {
   lua_pushfstring(L, "%s: %s", filename, "LUA I/O error descriptions have been removed in ScummVM");
   luaL_argerror(L, arg, lua_tostring(L, -1));
 }
-
+*/
 
 #define tofilep(L)	((FILE **)luaL_checkudata(L, 1, LUA_FILEHANDLE))
-
+#define tofileProxy(L)	((Sword25::Sword25FileProxy **)luaL_checkudata(L, 1, LUA_FILEHANDLE))
 
 static int io_type (lua_State *L) {
+	return luaL_error(L, "%s", "LUA I/O has been removed in ScummVM");
+/*
   void *ud;
   luaL_checkany(L, 1);
   ud = lua_touserdata(L, 1);
   lua_getfield(L, LUA_REGISTRYINDEX, LUA_FILEHANDLE);
   if (ud == NULL || !lua_getmetatable(L, 1) || !lua_rawequal(L, -2, -1))
-    lua_pushnil(L);  /* not a file */
+    lua_pushnil(L);  // not a file
   else if (*((FILE **)ud) == NULL)
     lua_pushliteral(L, "closed file");
   else
     lua_pushliteral(L, "file");
   return 1;
+*/
 }
 
-
-static FILE *tofile (lua_State *L) {
-  FILE **f = tofilep(L);
+static Sword25::Sword25FileProxy *tofile (lua_State *L) {
+  Sword25::Sword25FileProxy **f = tofileProxy(L);
   if (*f == NULL)
     luaL_error(L, "attempt to use a closed file");
   return *f;
 }
 
 
-
 /*
 ** When creating file handles, always creates a `closed' file handle
 ** before opening the actual file; so, if there is a memory error, the
 ** file is not left opened.
 */
-static FILE **newfile (lua_State *L) {
-  FILE **pf = (FILE **)lua_newuserdata(L, sizeof(FILE *));
+static Sword25::Sword25FileProxy **newfile (lua_State *L) {
+	Sword25::Sword25FileProxy **pf = (Sword25::Sword25FileProxy **)lua_newuserdata(L, sizeof(Sword25::Sword25FileProxy *));
   *pf = NULL;  /* file handle is currently `closed' */
   luaL_getmetatable(L, LUA_FILEHANDLE);
   lua_setmetatable(L, -2);
@@ -105,10 +107,13 @@ static int io_noclose (lua_State *L) {
 ** function to close 'popen' files
 */
 static int io_pclose (lua_State *L) {
+	error("LUA I/O has been removed in ScummVM");
+/*
   FILE **p = tofilep(L);
   int ok = lua_pclose(L, *p);
   *p = NULL;
   return pushresult(L, ok, NULL);
+  */
 }
 
 
@@ -116,52 +121,63 @@ static int io_pclose (lua_State *L) {
 ** function to close regular files
 */
 static int io_fclose (lua_State *L) {
+	error("LUA I/O has been removed in ScummVM");
+	/*
   FILE **p = tofilep(L);
   int ok = (fclose(*p) == 0);
   *p = NULL;
   return pushresult(L, ok, NULL);
+  */
 }
 
-
+/*
 static int aux_close (lua_State *L) {
   lua_getfenv(L, 1);
   lua_getfield(L, -1, "__close");
   return (lua_tocfunction(L, -1))(L);
 }
-
+*/
 
 static int io_close (lua_State *L) {
   if (lua_isnone(L, 1))
     lua_rawgeti(L, LUA_ENVIRONINDEX, IO_OUTPUT);
-  tofile(L);  /* make sure argument is a file */
-  return aux_close(L);
+
+  Sword25::Sword25FileProxy **f = tofileProxy(L);
+  delete *f;
+  *f = NULL;
+
+  return 0;
 }
 
 
 static int io_gc (lua_State *L) {
-  FILE *f = *tofilep(L);
-  /* ignore closed files */
-  if (f != NULL)
-    aux_close(L);
+  Sword25::Sword25FileProxy **f = tofileProxy(L);
+  // ignore closed files
+  if (*f != NULL)
+    delete *f;
+
   return 0;
 }
 
 
 static int io_tostring (lua_State *L) {
+  error("LUA I/O has been removed in ScummVM");
+  /*
   FILE *f = *tofilep(L);
   if (f == NULL)
     lua_pushliteral(L, "file (closed)");
   else
     lua_pushfstring(L, "file (%p)", f);
   return 1;
+  */
 }
 
 
 static int io_open (lua_State *L) {
   const char *filename = luaL_checkstring(L, 1);
   const char *mode = luaL_optstring(L, 2, "r");
-  FILE **pf = newfile(L);
-  *pf = fopen(filename, mode);
+  Sword25::Sword25FileProxy **pf = newfile(L);
+  *pf = new Sword25::Sword25FileProxy(filename, mode);
   return (*pf == NULL) ? pushresult(L, 0, filename) : 1;
 }
 
@@ -171,21 +187,22 @@ static int io_open (lua_State *L) {
 ** correct __close for 'popen' files
 */
 static int io_popen (lua_State *L) {
+  error("LUA I/O has been removed in ScummVM");
+/*
   const char *filename = luaL_checkstring(L, 1);
   const char *mode = luaL_optstring(L, 2, "r");
   FILE **pf = newfile(L);
   *pf = lua_popen(L, filename, mode);
   return (*pf == NULL) ? pushresult(L, 0, filename) : 1;
+  */
 }
 
 
 static int io_tmpfile (lua_State *L) {
-  FILE **pf = newfile(L);
-  *pf = tmpfile();
-  return (*pf == NULL) ? pushresult(L, 0, NULL) : 1;
+  return luaL_error(L, "%s", "LUA I/O error descriptions have been removed in ScummVM");
 }
 
-
+/*
 static FILE *getiofile (lua_State *L, int findex) {
   FILE *f;
   lua_rawgeti(L, LUA_ENVIRONINDEX, findex);
@@ -194,8 +211,8 @@ static FILE *getiofile (lua_State *L, int findex) {
     luaL_error(L, "standard %s file is closed", fnames[findex - 1]);
   return f;
 }
-
-
+*/
+/*
 static int g_iofile (lua_State *L, int f, const char *mode) {
   if (!lua_isnoneornil(L, 1)) {
     const char *filename = lua_tostring(L, 1);
@@ -206,24 +223,26 @@ static int g_iofile (lua_State *L, int f, const char *mode) {
         fileerror(L, 1, filename);
     }
     else {
-      tofile(L);  /* check that it's a valid file handle */
+      tofile(L);  // check that it's a valid file handle
       lua_pushvalue(L, 1);
     }
     lua_rawseti(L, LUA_ENVIRONINDEX, f);
   }
-  /* return current value */
+  // return current value 
   lua_rawgeti(L, LUA_ENVIRONINDEX, f);
   return 1;
 }
-
+*/
 
 static int io_input (lua_State *L) {
-  return g_iofile(L, IO_INPUT, "r");
+  error("LUA I/O has been removed in ScummVM");
+//  return g_iofile(L, IO_INPUT, "r");
 }
 
 
 static int io_output (lua_State *L) {
-  return g_iofile(L, IO_OUTPUT, "w");
+  error("LUA I/O has been removed in ScummVM");
+//  return g_iofile(L, IO_OUTPUT, "w");
 }
 
 
@@ -245,8 +264,10 @@ static int f_lines (lua_State *L) {
 
 
 static int io_lines (lua_State *L) {
-  if (lua_isnoneornil(L, 1)) {  /* no arguments? */
-    /* will iterate over default input */
+  error("LUA I/O has been removed in ScummVM");
+/*
+  if (lua_isnoneornil(L, 1)) {  // no arguments?
+    // will iterate over default input
     lua_rawgeti(L, LUA_ENVIRONINDEX, IO_INPUT);
     return f_lines(L);
   }
@@ -259,6 +280,7 @@ static int io_lines (lua_State *L) {
     aux_lines(L, lua_gettop(L), 1);
     return 1;
   }
+  */
 }
 
 
@@ -268,18 +290,18 @@ static int io_lines (lua_State *L) {
 ** =======================================================
 */
 
-
-static int read_number (lua_State *L, FILE *f) {
+/*
+static int read_number (lua_State *L, Sword25::Sword25FileProxy *f) {
   lua_Number d;
   if (fscanf(f, LUA_NUMBER_SCAN, &d) == 1) {
     lua_pushnumber(L, d);
     return 1;
   }
-  else return 0;  /* read fails */
+  else return 0;  // read fails
 }
 
 
-static int test_eof (lua_State *L, FILE *f) {
+static int test_eof (lua_State *L, Sword25::Sword25FileProxy *f) {
   int c = getc(f);
   ungetc(c, f);
   lua_pushlstring(L, NULL, 0);
@@ -287,56 +309,56 @@ static int test_eof (lua_State *L, FILE *f) {
 }
 
 
-static int read_line (lua_State *L, FILE *f) {
+static int read_line (lua_State *L, Sword25::Sword25FileProxy *f) {
   luaL_Buffer b;
   luaL_buffinit(L, &b);
   for (;;) {
     size_t l;
     char *p = luaL_prepbuffer(&b);
-    if (fgets(p, LUAL_BUFFERSIZE, f) == NULL) {  /* eof? */
-      luaL_pushresult(&b);  /* close buffer */
-      return (lua_objlen(L, -1) > 0);  /* check whether read something */
+    if (fgets(p, LUAL_BUFFERSIZE, f) == NULL) {  // eof? 
+      luaL_pushresult(&b);  // close buffer
+      return (lua_objlen(L, -1) > 0);  // check whether read something
     }
     l = strlen(p);
     if (l == 0 || p[l-1] != '\n')
       luaL_addsize(&b, l);
     else {
-      luaL_addsize(&b, l - 1);  /* do not include `eol' */
-      luaL_pushresult(&b);  /* close buffer */
-      return 1;  /* read at least an `eol' */
+      luaL_addsize(&b, l - 1);  // do not include `eol'
+      luaL_pushresult(&b);  // close buffer
+      return 1;  // read at least an `eol'
     }
   }
 }
 
 
-static int read_chars (lua_State *L, FILE *f, size_t n) {
-  size_t rlen;  /* how much to read */
-  size_t nr;  /* number of chars actually read */
+static int read_chars (lua_State *L, Sword25::Sword25FileProxy *f, size_t n) {
+  size_t rlen;  // how much to read 
+  size_t nr;  // number of chars actually read 
   luaL_Buffer b;
   luaL_buffinit(L, &b);
-  rlen = LUAL_BUFFERSIZE;  /* try to read that much each time */
+  rlen = LUAL_BUFFERSIZE;  // try to read that much each time 
   do {
     char *p = luaL_prepbuffer(&b);
-    if (rlen > n) rlen = n;  /* cannot read more than asked */
+    if (rlen > n) rlen = n;  // cannot read more than asked 
     nr = fread(p, sizeof(char), rlen, f);
     luaL_addsize(&b, nr);
-    n -= nr;  /* still have to read `n' chars */
-  } while (n > 0 && nr == rlen);  /* until end of count or eof */
-  luaL_pushresult(&b);  /* close buffer */
+    n -= nr;  // still have to read `n' chars 
+  } while (n > 0 && nr == rlen);  // until end of count or eof 
+  luaL_pushresult(&b);  // close buffer 
   return (n == 0 || lua_objlen(L, -1) > 0);
 }
 
 
-static int g_read (lua_State *L, FILE *f, int first) {
+static int g_read (lua_State *L, Sword25::Sword25FileProxy *f, int first) {
   int nargs = lua_gettop(L) - 1;
   int success;
   int n;
   clearerr(f);
-  if (nargs == 0) {  /* no arguments? */
+  if (nargs == 0) {  // no arguments? 
     success = read_line(L, f);
-    n = first+1;  /* to return 1 result */
+    n = first+1;  // to return 1 result 
   }
-  else {  /* ensure stack space for all results and for auxlib's buffer */
+  else {  // ensure stack space for all results and for auxlib's buffer 
     luaL_checkstack(L, nargs+LUA_MINSTACK, "too many arguments");
     success = 1;
     for (n = first; nargs-- && success; n++) {
@@ -348,15 +370,15 @@ static int g_read (lua_State *L, FILE *f, int first) {
         const char *p = lua_tostring(L, n);
         luaL_argcheck(L, p && p[0] == '*', n, "invalid option");
         switch (p[1]) {
-          case 'n':  /* number */
+          case 'n':  // number 
             success = read_number(L, f);
             break;
-          case 'l':  /* line */
+          case 'l':  // line 
             success = read_line(L, f);
             break;
-          case 'a':  /* file */
-            read_chars(L, f, ~((size_t)0));  /* read MAX_SIZE_T chars */
-            success = 1; /* always success */
+          case 'a':  // file 
+            read_chars(L, f, ~((size_t)0));  // read MAX_SIZE_T chars 
+            success = 1; // always success 
             break;
           default:
             return luaL_argerror(L, n, "invalid format");
@@ -367,58 +389,66 @@ static int g_read (lua_State *L, FILE *f, int first) {
   if (ferror(f))
     return pushresult(L, 0, NULL);
   if (!success) {
-    lua_pop(L, 1);  /* remove last result */
-    lua_pushnil(L);  /* push nil instead */
+    lua_pop(L, 1);  // remove last result 
+    lua_pushnil(L);  // push nil instead 
   }
   return n - first;
 }
-
+*/
 
 static int io_read (lua_State *L) {
-  return g_read(L, getiofile(L, IO_INPUT), 1);
+  error("LUA I/O has been removed in ScummVM");
+//  return g_read(L, getiofile(L, IO_INPUT), 1);
 }
 
 
 static int f_read (lua_State *L) {
-  return g_read(L, tofile(L), 2);
+  error("LUA I/O has been removed in ScummVM");
+//  return g_read(L, tofile(L), 2);
 }
 
 
 static int io_readline (lua_State *L) {
+  error("LUA I/O has been removed in ScummVM");
+/*
   FILE *f = *(FILE **)lua_touserdata(L, lua_upvalueindex(1));
   int sucess;
-  if (f == NULL)  /* file is already closed? */
+  if (f == NULL)  // file is already closed?
     luaL_error(L, "file is already closed");
   sucess = read_line(L, f);
   if (ferror(f))
     return luaL_error(L, "%s", "LUA I/O error descriptions have been removed in ScummVM");
   if (sucess) return 1;
-  else {  /* EOF */
-    if (lua_toboolean(L, lua_upvalueindex(2))) {  /* generator created file? */
+  else {  // EOF 
+    if (lua_toboolean(L, lua_upvalueindex(2))) {  // generator created file? 
       lua_settop(L, 0);
       lua_pushvalue(L, lua_upvalueindex(1));
-      aux_close(L);  /* close it */
+      aux_close(L);  // close it
     }
     return 0;
   }
+*/
 }
 
 /* }====================================================== */
 
 
-static int g_write (lua_State *L, FILE *f, int arg) {
+static int g_write (lua_State *L, Sword25::Sword25FileProxy *f, int arg) {
   int nargs = lua_gettop(L) - 1;
   int status = 1;
   for (; nargs--; arg++) {
     if (lua_type(L, arg) == LUA_TNUMBER) {
-      /* optimization: could be done exactly as for strings */
-      status = status &&
-          fprintf(f, LUA_NUMBER_FMT, lua_tonumber(L, arg)) > 0;
-    }
+      // optimization: could be done exactly as for strings
+	  if (status) {
+        char buffer[20];
+		sprintf(buffer, LUA_NUMBER_FMT, lua_tonumber(L, arg));
+		status = f->write(buffer, strlen(buffer)) == strlen(buffer);
+	  }
+	}
     else {
       size_t l;
       const char *s = luaL_checklstring(L, arg, &l);
-      status = status && (fwrite(s, sizeof(char), l, f) == l);
+      status = status && (f->write(s, l) == l);
     }
   }
   return pushresult(L, status, NULL);
@@ -426,7 +456,8 @@ static int g_write (lua_State *L, FILE *f, int arg) {
 
 
 static int io_write (lua_State *L) {
-  return g_write(L, getiofile(L, IO_OUTPUT), 1);
+  error("LUA I/O has been removed in ScummVM");
+//  return g_write(L, getiofile(L, IO_OUTPUT), 1);
 }
 
 
@@ -436,6 +467,8 @@ static int f_write (lua_State *L) {
 
 
 static int f_seek (lua_State *L) {
+  error("LUA I/O has been removed in ScummVM");
+  /*
   static const int mode[] = {SEEK_SET, SEEK_CUR, SEEK_END};
   static const char *const modenames[] = {"set", "cur", "end", NULL};
   FILE *f = tofile(L);
@@ -443,15 +476,18 @@ static int f_seek (lua_State *L) {
   long offset = luaL_optlong(L, 3, 0);
   op = fseek(f, offset, mode[op]);
   if (op)
-    return pushresult(L, 0, NULL);  /* error */
+    return pushresult(L, 0, NULL);  // error
   else {
     lua_pushinteger(L, ftell(f));
     return 1;
   }
+*/
 }
 
 
 static int f_setvbuf (lua_State *L) {
+  error("LUA I/O has been removed in ScummVM");
+  /*
   static const int mode[] = {_IONBF, _IOFBF, _IOLBF};
   static const char *const modenames[] = {"no", "full", "line", NULL};
   FILE *f = tofile(L);
@@ -459,17 +495,20 @@ static int f_setvbuf (lua_State *L) {
   lua_Integer sz = luaL_optinteger(L, 3, LUAL_BUFFERSIZE);
   int res = setvbuf(f, NULL, mode[op], sz);
   return pushresult(L, res == 0, NULL);
+  */
 }
 
 
 
 static int io_flush (lua_State *L) {
-  return pushresult(L, fflush(getiofile(L, IO_OUTPUT)) == 0, NULL);
+  error("LUA I/O has been removed in ScummVM");
+//  return pushresult(L, fflush(getiofile(L, IO_OUTPUT)) == 0, NULL);
 }
 
 
 static int f_flush (lua_State *L) {
-  return pushresult(L, fflush(tofile(L)) == 0, NULL);
+  error("LUA I/O has been removed in ScummVM");
+//  return pushresult(L, fflush(tofile(L)) == 0, NULL);
 }
 
 
@@ -510,18 +549,18 @@ static void createmeta (lua_State *L) {
   luaL_register(L, NULL, flib);  /* file methods */
 }
 
-
+/*
 static void createstdfile (lua_State *L, FILE *f, int k, const char *fname) {
   *newfile(L) = f;
   if (k > 0) {
     lua_pushvalue(L, -1);
     lua_rawseti(L, LUA_ENVIRONINDEX, k);
   }
-  lua_pushvalue(L, -2);  /* copy environment */
-  lua_setfenv(L, -2);  /* set it */
+  lua_pushvalue(L, -2);  // copy environment
+  lua_setfenv(L, -2);  // set it
   lua_setfield(L, -3, fname);
 }
-
+*/
 
 static void newfenv (lua_State *L, lua_CFunction cls) {
   lua_createtable(L, 0, 1);
@@ -539,9 +578,11 @@ LUALIB_API int luaopen_io (lua_State *L) {
   luaL_register(L, LUA_IOLIBNAME, iolib);
   /* create (and set) default files */
   newfenv(L, io_noclose);  /* close function for default files */
+/*
   createstdfile(L, stdin, IO_INPUT, "stdin");
   createstdfile(L, stdout, IO_OUTPUT, "stdout");
   createstdfile(L, stderr, 0, "stderr");
+*/
   lua_pop(L, 1);  /* pop environment for default files */
   lua_getfield(L, -1, "popen");
   newfenv(L, io_pclose);  /* create environment for 'popen' */
diff --git a/engines/sword25/util/lua/scummvm_file.cpp b/engines/sword25/util/lua/scummvm_file.cpp
index bb0da64bab..2b7ac6d942 100644
--- a/engines/sword25/util/lua/scummvm_file.cpp
+++ b/engines/sword25/util/lua/scummvm_file.cpp
@@ -53,6 +53,99 @@ SFX_SPEECH_VOLUME = %f\r\n",
 	_readPos = 0;
 }
 
+Sword25FileProxy::~Sword25FileProxy() {
+	if (!_settings.empty())
+		writeSettings();
+}
+
+size_t Sword25FileProxy::read(void *ptr, size_t size, size_t count) {
+	size_t bytesRead = MIN(_readData.size() - _readPos, size * count);
+	memmove(ptr, &_readData.c_str()[_readPos], bytesRead);
+	_readPos += bytesRead;
+	return bytesRead / size;
+}
+
+size_t Sword25FileProxy::write(const char *ptr, size_t count) {
+	// Loop through the provided line(s)
+	while (*ptr) {
+		if ((*ptr == '-') && (*(ptr + 1) == '-')) {
+			// Comment line to skip over
+			while ((*ptr != '\r') && (*ptr != '\n'))
+				++ptr;
+		} else {
+			// Legitimate data
+			const char *p = strchr(ptr, '\n');
+			if (!p) p = ptr + strlen(ptr);
+			while ((*p == '\r') || (*p == '\n')) 
+				++p;
+
+			_settings += Common::String(ptr, p - ptr);
+			ptr = p;
+		}
+
+		while ((*ptr == '\r') || (*ptr == '\n')) 
+			++ptr;
+	}
+
+	return count;
+}
+
+void Sword25FileProxy::writeSettings() {
+	// Loop through the setting lines
+	const char *pSrc = _settings.c_str();
+	while (*pSrc) {
+		if ((*pSrc != '\r') && (*pSrc != '\n')) {
+			const char *p = strchr(pSrc, '=');
+			assert(p);
+			
+			// Get the setting name
+			const char *pEnd = p - 1;
+			while (*pEnd == ' ')
+				--pEnd;
+			Common::String settingName(pSrc, pEnd - pSrc + 1);
+
+			// Get the setting value
+			const char *pStart = p + 1;
+			while (*pStart == ' ')
+				++pStart;
+
+			pEnd = pStart + 1;
+			while ((*pEnd != '\r') && (*pEnd != '\n') && (*pEnd != '\0')) 
+				++pEnd;
+			Common::String value(pStart + (*pStart == '"' ? 1 : 0), pEnd - pStart - (*pStart == '"' ? 2 : 0));
+			
+			// Update the setting
+			updateSetting(settingName, value);
+			pSrc = pEnd;
+		}
+
+		// Move to next line
+		while ((*pSrc == '\r') || (*pSrc == '\n'))
+			++pSrc;
+	}
+
+	ConfMan.flushToDisk();
+}
+
+void Sword25FileProxy::updateSetting(const Common::String &setting, const Common::String &value) {
+	if (setting == "GAME_LANGUAGE")
+		setLanguage(value);
+	else if (setting == "GAME_SUBTITLES")
+		ConfMan.setBool("subtitles", value == "true");
+	else if (setting == "SFX_SOUND_VOLUME") {
+		double v = strtod(value.c_str(), NULL);
+		ConfMan.setInt("sfx_volume", (int)(v * 255));
+	} else if (setting == "SFX_MUSIC_VOLUME") {
+		double v = strtod(value.c_str(), NULL);
+		ConfMan.setInt("music_volume", (int)(v * 255));
+	} else if (setting == "SFX_SPEECH_VOLUME") {
+		double v = strtod(value.c_str(), NULL);
+		ConfMan.setInt("speech_volume", (int)(v * 255));
+	} else {
+		// All other settings are ignored
+	}
+}
+
 /**
  * Get the language code used by the game for each language it supports
  */
@@ -83,11 +176,30 @@ Common::String Sword25FileProxy::getLanguage() {
 	}
 }
 
-size_t Sword25FileProxy::read(void *ptr, size_t size, size_t count) {
-	size_t bytesRead = MIN(_readData.size() - _readPos, size * count);
-	memmove(ptr, &_readData.c_str()[_readPos], bytesRead);
-	_readPos += bytesRead;
-	return bytesRead / size;
+/**
+ * Set the language code fro the game
+ */
+void Sword25FileProxy::setLanguage(const Common::String &lang) {
+	if (lang == "en")
+		ConfMan.set("language", Common::getLanguageCode(Common::EN_ANY));
+	else if (lang == "de")
+		ConfMan.set("language", Common::getLanguageCode(Common::DE_DEU));
+	else if (lang == "es")
+		ConfMan.set("language", Common::getLanguageCode(Common::ES_ESP));
+	else if (lang == "fr")
+		ConfMan.set("language", Common::getLanguageCode(Common::FR_FRA));
+	else if (lang == "hr")
+		ConfMan.set("language", Common::getLanguageCode(Common::HU_HUN));
+	else if (lang == "it")
+		ConfMan.set("language", Common::getLanguageCode(Common::IT_ITA));
+	else if (lang == "pl")
+		ConfMan.set("language", Common::getLanguageCode(Common::PL_POL));
+	else if (lang == "pt")
+		ConfMan.set("language", Common::getLanguageCode(Common::PT_BRA));
+	else if (lang == "ru")
+		ConfMan.set("language", Common::getLanguageCode(Common::RU_RUS));
+	else
+		error("Unknown language encountered");
 }
 
 } // End of namespace Sword25
diff --git a/engines/sword25/util/lua/scummvm_file.h b/engines/sword25/util/lua/scummvm_file.h
index 8ecfd34498..a4cbd2a6cf 100644
--- a/engines/sword25/util/lua/scummvm_file.h
+++ b/engines/sword25/util/lua/scummvm_file.h
@@ -35,13 +35,20 @@ class Sword25FileProxy {
 private:
 	Common::String _readData;
 	uint _readPos;
+	Common::String _settings;
 
 	void setupConfigFile();
 	Common::String getLanguage();
+	void setLanguage(const Common::String &lang);
+	void writeSettings();
+	void updateSetting(const Common::String &setting, const Common::String &value);
 public:
 	Sword25FileProxy(const Common::String &filename, const Common::String &mode);
+	~Sword25FileProxy();
+
 	bool eof() const { return _readPos >= _readData.size(); }
 	size_t read(void *ptr, size_t size, size_t count);
+	size_t write(const char *ptr, size_t count);
 };
 
 } // End of namespace Sword25