convert id3 tags, directories and playlist names to current locale if needed

notice: this feature needs unicode disabled.

src/charset.cpp

@@ -0,0 +1,150 @@
+/***************************************************************************
+ *   Copyright (C) 2008 by Andrzej Rybczak   *
+ *   electricityispower@gmail.com   *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
+ ***************************************************************************/
+
+#include "charset.h"
+
+#if !defined(_UTF8) && defined(HAVE_ICONV_H)
+
+#include <iconv.h>
+#include <cstdlib>
+#include <cstring>
+#include <fstream>
+#include <stdexcept>
+
+#include "locale.h"
+#include "str_pool.h"
+
+namespace
+{
+	char *locale_charset = 0;
+	
+	bool has_non_ascii_chars(const char *s)
+	{
+		for (; s; s++)
+			if (*s < 0)
+				return true;
+		return false;
+	}
+	
+	bool has_non_ascii_chars(const std::string &s)
+	{
+		for (std::string::const_iterator it = s.begin(); it != s.end(); it++)
+			if (*it < 0)
+				return true;
+		return false;
+	}
+	
+	void charset_convert(const char *from, const char *to, char *&inbuf, size_t len = 0)
+	{
+		if (!inbuf || !from || !to)
+			return;
+		
+		iconv_t cd = iconv_open(to, from);
+		
+		if (cd == (iconv_t)-1)
+			return;
+		
+		if (!len)
+			len = strlen(inbuf);
+		size_t buflen = len*6+1;
+		char *outbuf = new char[buflen];
+		memset(outbuf, 0, sizeof(char)*buflen);
+		char *outstart = outbuf;
+		char *instart = inbuf;
+		
+		if (iconv(cd, &inbuf, &len, &outbuf, &buflen) == (size_t)-1)
+		{
+			delete [] outstart;
+			iconv_close(cd);
+			return;
+		}
+		iconv_close(cd);
+		
+		str_pool_put(instart);
+		inbuf = str_pool_get(outstart);
+		delete [] outstart;
+	}
+}
+
+void init_current_locale()
+{
+	std::string envlocale = getenv("LC_CTYPE") ? getenv("LC_CTYPE") : (getenv("LC_ALL") ? getenv("LC_ALL") : "");
+	if (envlocale.empty())
+		return;
+	std::ifstream f(SUPPORTED_LOCALES);
+	if (!f.is_open())
+		return;
+	envlocale += " ";
+	std::string line;
+	while (!f.eof())
+	{
+		getline(f, line);
+		if (line.find(envlocale) != std::string::npos)
+		{
+			try
+			{
+				locale_charset = strdup((line.substr(line.find(" ")+1) + "//TRANSLIT").c_str());
+			}
+			catch (std::out_of_range)
+			{
+				return;
+			}
+			break;
+		}
+	}
+	f.close();
+}
+
+void utf_to_locale(std::string &s)
+{
+	if (s.empty() || !locale_charset || !has_non_ascii_chars(s))
+		return;
+	char *tmp = str_pool_get(s.c_str());
+	charset_convert("utf8", locale_charset, tmp, s.length());
+	s = tmp;
+	str_pool_put(tmp);
+}
+
+void locale_to_utf(std::string &s)
+{
+	if (s.empty() || !locale_charset || !has_non_ascii_chars(s))
+		return;
+	char *tmp = str_pool_get(s.c_str());
+	charset_convert(locale_charset, "utf8", tmp, s.length());
+	s = tmp;
+	str_pool_put(tmp);
+}
+
+void str_pool_utf_to_locale(char *&s)
+{
+	if (!has_non_ascii_chars(s))
+		return;
+	charset_convert("utf8", locale_charset, s);
+}
+
+void str_pool_locale_to_utf(char *&s)
+{
+	if (!has_non_ascii_chars(s))
+		return;
+	charset_convert(locale_charset, "utf8", s);
+}
+
+#endif
+