From 2c998051173484aeac026de21a50177313908d37 Mon Sep 17 00:00:00 2001
From: yexo <yexo@openttd.org>
Date: Mon, 16 Jan 2012 22:29:25 +0000
Subject: (svn r23816) -Fix (r23635, r23805): make SCC_ENCODED the first entry
 in the StringControlCode enum since it's value is not allowed to change

---
 src/saveload/saveload.cpp |  6 +++++-
 src/string.cpp            | 26 +++++++++++++++++++++++++-
 src/string_func.h         |  1 +
 src/table/control_codes.h |  6 ++++--
 4 files changed, 35 insertions(+), 4 deletions(-)

diff --git a/src/saveload/saveload.cpp b/src/saveload/saveload.cpp
index 92b222d69..8a012b233 100644
--- a/src/saveload/saveload.cpp
+++ b/src/saveload/saveload.cpp
@@ -232,8 +232,9 @@
  *  166   23415
  *  167   23504
  *  168   23637
+ *  169   23816
  */
-extern const uint16 SAVEGAME_VERSION = 168; ///< Current savegame version of OpenTTD.
+extern const uint16 SAVEGAME_VERSION = 169; ///< Current savegame version of OpenTTD.
 
 SavegameType _savegame_type; ///< type of savegame we are loading
 
@@ -1096,6 +1097,9 @@ static void SlString(void *ptr, size_t length, VarType conv)
 			StringValidationSettings settings = SVS_REPLACE_WITH_QUESTION_MARK;
 			if ((conv & SLF_ALLOW_CONTROL) != 0) {
 				settings = settings | SVS_ALLOW_CONTROL_CODE;
+				if (IsSavegameVersionBefore(169)) {
+					str_fix_scc_encoded((char *)ptr, (char *)ptr + len);
+				}
 			}
 			if ((conv & SLF_ALLOW_NEWLINE) != 0) {
 				settings = settings | SVS_ALLOW_NEWLINE;
diff --git a/src/string.cpp b/src/string.cpp
index bc9933b40..4f7865ada 100644
--- a/src/string.cpp
+++ b/src/string.cpp
@@ -178,6 +178,30 @@ char *CDECL str_fmt(const char *str, ...)
 	return p;
 }
 
+/**
+ * Scan the string for old values of SCC_ENCODED and fix it to
+ * it's new, static value.
+ * @param str the string to scan
+ * @param last the last valid character of str
+ */
+void str_fix_scc_encoded(char *str, const char *last)
+{
+	while (str <= last && *str != '\0') {
+		size_t len = Utf8EncodedCharLen(*str);
+		if ((len == 0 && str + 4 > last) || str + len > last) break;
+
+		WChar c;
+		len = Utf8Decode(&c, str);
+		if (c == '\0') break;
+
+		if (c == 0xE028 || c == 0xE02A) {
+			c = SCC_ENCODED;
+		}
+		str += Utf8Encode(str, c);
+	}
+	*str = '\0';
+}
+
 
 /**
  * Scans the string for valid characters and if it finds invalid ones,
@@ -207,7 +231,7 @@ void str_validate(char *str, const char *last, StringValidationSettings settings
 		 * characters to be skipped */
 		if (c == '\0') break;
 
-		if ((IsPrintable(c) && (c < SCC_SPRITE_START || c > SCC_SPRITE_END)) || ((settings & SVS_ALLOW_CONTROL_CODE) != 0 && IsInsideMM(c, SCC_CONTROL_START, SCC_CONTROL_END))) {
+		if ((IsPrintable(c) && (c < SCC_SPRITE_START || c > SCC_SPRITE_END)) || ((settings & SVS_ALLOW_CONTROL_CODE) != 0 && c == SCC_ENCODED)) {
 			/* Copy the character back. Even if dst is current the same as str
 			 * (i.e. no characters have been changed) this is quicker than
 			 * moving the pointers ahead by len */
diff --git a/src/string_func.h b/src/string_func.h
index ac2fd0e76..070695fdb 100644
--- a/src/string_func.h
+++ b/src/string_func.h
@@ -40,6 +40,7 @@ int CDECL seprintf(char *str, const char *last, const char *format, ...) WARN_FO
 char *CDECL str_fmt(const char *str, ...) WARN_FORMAT(1, 2);
 
 void str_validate(char *str, const char *last, StringValidationSettings settings = SVS_REPLACE_WITH_QUESTION_MARK);
+void str_fix_scc_encoded(char *str, const char *last);
 void str_strip_colours(char *str);
 bool strtolower(char *str);
 
diff --git a/src/table/control_codes.h b/src/table/control_codes.h
index 28266c155..81b100921 100644
--- a/src/table/control_codes.h
+++ b/src/table/control_codes.h
@@ -23,8 +23,11 @@ enum StringControlCode {
 	SCC_SPRITE_START  = 0xE200,
 	SCC_SPRITE_END    = SCC_SPRITE_START + 0xFF,
 
+	/* This must be the first entry. It's encoded in strings that are saved. */
+	SCC_ENCODED = SCC_CONTROL_START,
+
 	/* Display control codes */
-	SCC_SETX = SCC_CONTROL_START,
+	SCC_SETX,
 	SCC_SETXY,
 	SCC_TINYFONT,  ///< Switch to small font
 	SCC_BIGFONT,   ///< Switch to large font
@@ -74,7 +77,6 @@ enum StringControlCode {
 	SCC_STRING6,
 	SCC_STRING7,
 
-	SCC_ENCODED,
 
 	SCC_STRING,
 	SCC_COMMA,
-- 
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