Fix issue #31; Removed down_cast

core/os_windows.odin

@@ -194,9 +194,6 @@ last_write_time_by_name :: proc(name: string) -> File_Time {
 }
 
 
-
-
-
 read_entire_file :: proc(name: string) -> ([]byte, bool) {
 	buf: [300]byte;
 	copy(buf[..], cast([]byte)name);
@@ -208,13 +205,12 @@ read_entire_file :: proc(name: string) -> ([]byte, bool) {
 	defer close(fd);
 
 	length: i64;
-	file_size_ok := win32.GetFileSizeEx(cast(win32.Handle)fd, ^length) != 0;
-	if !file_size_ok {
+	if ok := win32.GetFileSizeEx(cast(win32.Handle)fd, ^length) != 0; !ok {
 		return nil, false;
 	}
 
 	data := make([]byte, length);
-	if ^data[0] == nil {
+	if data == nil {
 		return nil, false;
 	}
 

core/utf16.odin

@@ -0,0 +1,58 @@
+REPLACEMENT_CHAR :: '\uFFFD';
+MAX_RUNE         :: '\U0010FFFF';
+
+_surr1           :: 0xd800;
+_surr2           :: 0xdc00;
+_surr3           :: 0xe000;
+_surr_self       :: 0x10000;
+
+
+is_surrogate :: proc(r: rune) -> bool {
+	return _surr1 <= r && r < _surr3;
+}
+
+decode_surrogate_pair :: proc(r1, r2: rune) -> rune {
+	if _surr1 <= r1 && r1 < _surr2 && _surr2 <= r2 && r2 < _surr3 {
+		return (r1-_surr1)<<10 | (r2 - _surr2) + _surr_self;
+	}
+	return REPLACEMENT_CHAR;
+}
+
+
+encode_surrogate_pair :: proc(r: rune) -> (r1, r2: rune) {
+	if r < _surr_self || r > MAX_RUNE {
+		return REPLACEMENT_CHAR, REPLACEMENT_CHAR;
+	}
+	r -= _surr_self;
+	return _surr1 + (r>>10)&0x3ff, _surr2 + r&0x3ff;
+}
+
+encode :: proc(d: []u16, s: []rune) {
+	n := len(s);
+	for r in s {
+		if r >= _surr_self {
+			n++;
+		}
+	}
+
+	max_n := min(len(d), n);
+	n = 0;
+
+	for r in s {
+		match {
+		case 0 <= r && r < _surr1, _surr3 <= r && r < _surr_self:
+			d[n] = cast(u16)r;
+			n++;
+
+		case _surr_self <= r && r <= MAX_RUNE:
+			r1, r2 := encode_surrogate_pair(r);
+			d[n]    = cast(u16)r1;
+			d[n+1]  = cast(u16)r2;
+			n += 2;
+
+		default:
+			d[n] = cast(u16)REPLACEMENT_CHAR;
+			n++;
+		}
+	}
+}