From 5861b52cffd9f0a7969562216645ec8b7a440db0 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Cl=C3=A9ment=20de=20l=27Hamaide?= <clemaez@hotmail.fr>
Date: Sun, 1 Dec 2013 18:47:49 +0100
Subject: [PATCH] Implement UTF-8 to Latin1 converter

---
 simgear/misc/strutils.cxx | 33 +++++++++++++++++++++++++++++++++
 simgear/misc/strutils.hxx |  5 +++++
 2 files changed, 38 insertions(+)

diff --git a/simgear/misc/strutils.cxx b/simgear/misc/strutils.cxx
index 52a8d619..25480271 100644
--- a/simgear/misc/strutils.cxx
+++ b/simgear/misc/strutils.cxx
@@ -35,6 +35,39 @@ using std::stringstream;
 namespace simgear {
     namespace strutils {
 
+	/*
+	 * utf8ToLatin1() convert utf8 to latin, useful for accent character (i.e éâàîè...)
+	 */
+	template <typename Iterator> size_t get_length (Iterator p) {
+		unsigned char c = static_cast<unsigned char> (*p);
+		if (c < 0x80) return 1;
+		else if (!(c & 0x20)) return 2;
+		else if (!(c & 0x10)) return 3;
+		else if (!(c & 0x08)) return 4;
+		else if (!(c & 0x04)) return 5;
+		else return 6;
+	}
+
+	typedef unsigned int value_type;
+	template <typename Iterator> value_type get_value (Iterator p) {
+		size_t len = get_length (p);
+		if (len == 1) return *p;
+		value_type res = static_cast<unsigned char> ( *p & (0xff >> (len + 1))) << ((len - 1) * 6 );
+		for (--len; len; --len)
+			res |= (static_cast<unsigned char> (*(++p)) - 0x80) << ((len - 1) * 6);
+		return res;
+	}
+
+	string utf8ToLatin1( string& s_utf8 ) {
+		string s_latin1;
+		for (string::iterator p = s_utf8.begin(); p != s_utf8.end(); ++p) {
+			value_type value = get_value<string::iterator&>(p);
+			if (value > 0xff) SG_LOG(SG_IO, SG_WARN, "utf8ToLatin1: wrong char value: " << value);
+			s_latin1 += static_cast<char>(value);
+		}
+		return s_latin1;
+	}
+
 	/**
 	 * 
 	 */
diff --git a/simgear/misc/strutils.hxx b/simgear/misc/strutils.hxx
index 47f69bac..9070b246 100644
--- a/simgear/misc/strutils.hxx
+++ b/simgear/misc/strutils.hxx
@@ -38,6 +38,11 @@ typedef std::vector < std::string > string_list;
 namespace simgear {
   namespace strutils {
 
+	/**
+	 * utf8ToLatin1() convert utf8 to latin, useful for accent character (i.e éâàîè...)
+	 */
+	std::string utf8ToLatin1( std::string & s_utf8 );
+
 // 	/** 
 // 	 * atof() wrapper for "string" type
 // 	 */
-- 
2.39.5