fs/Path: move configuration code to Config.cxx

src/fs/Charset.cxx

@@ -0,0 +1,113 @@
+/*
+ * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "Charset.hxx"
+#include "Domain.hxx"
+#include "Limits.hxx"
+#include "system/FatalError.hxx"
+#include "util/Error.hxx"
+#include "util/Domain.hxx"
+#include "Log.hxx"
+
+#include <glib.h>
+
+#include <assert.h>
+#include <string.h>
+
+/**
+ * Maximal number of bytes required to represent path name in UTF-8
+ * (including nul-terminator).
+ * This value is a rought estimate of upper bound.
+ * It's based on path name limit in bytes (MPD_PATH_MAX)
+ * and assumption that some weird encoding could represent some UTF-8 4 byte
+ * sequences with single byte.
+ */
+static constexpr size_t MPD_PATH_MAX_UTF8 = (MPD_PATH_MAX - 1) * 4 + 1;
+
+static std::string fs_charset;
+
+gcc_pure
+static bool
+IsSupportedCharset(const char *charset)
+{
+	/* convert a space to check if the charset is valid */
+	char *test = g_convert(" ", 1, charset, "UTF-8", NULL, NULL, NULL);
+	if (test == NULL)
+		return false;
+
+	g_free(test);
+	return true;
+}
+
+void
+SetFSCharset(const char *charset)
+{
+	assert(charset != NULL);
+
+	if (!IsSupportedCharset(charset))
+		FormatFatalError("invalid filesystem charset: %s", charset);
+
+	fs_charset = charset;
+
+	FormatDebug(path_domain,
+		    "SetFSCharset: fs charset is: %s", fs_charset.c_str());
+}
+
+const std::string &
+GetFSCharset()
+{
+	return fs_charset;
+}
+
+std::string
+PathToUTF8(const char *path_fs)
+{
+	if (path_fs == nullptr)
+		return std::string();
+
+	GIConv conv = g_iconv_open("utf-8", fs_charset.c_str());
+	if (conv == reinterpret_cast<GIConv>(-1))
+		return std::string();
+
+	// g_iconv() does not need nul-terminator,
+	// std::string could be created without it too.
+	char path_utf8[MPD_PATH_MAX_UTF8 - 1];
+	char *in = const_cast<char *>(path_fs);
+	char *out = path_utf8;
+	size_t in_left = strlen(path_fs);
+	size_t out_left = sizeof(path_utf8);
+
+	size_t ret = g_iconv(conv, &in, &in_left, &out, &out_left);
+
+	g_iconv_close(conv);
+
+	if (ret == static_cast<size_t>(-1) || in_left > 0)
+		return std::string();
+
+	return std::string(path_utf8, sizeof(path_utf8) - out_left);
+}
+
+char *
+PathFromUTF8(const char *path_utf8)
+{
+	return g_convert(path_utf8, -1,
+			 fs_charset.c_str(), "utf-8",
+			 nullptr, nullptr, nullptr);
+}