Path: convert fs_charset_to_utf8() to static method Path::ToUTF8()

src/fs/Path.cxx

@@ -48,24 +48,31 @@
 
 static char *fs_charset;
 
-std::string Path::ToUTF8() const
+std::string Path::ToUTF8(const_pointer path_fs)
 {
-	if (value == nullptr)
+	if (path_fs == nullptr)
 		return std::string();
-	char *path_utf8 = fs_charset_to_utf8(value);
-	if (path_utf8 == nullptr)
-		return std::string();
-	std::string result = value;
-	g_free(path_utf8);
-	return value;
-}
 
-char *
-fs_charset_to_utf8(const char *path_fs)
-{
-	return g_convert(path_fs, -1,
-			 "utf-8", fs_charset,
-			 NULL, NULL, NULL);
+	GIConv conv = g_iconv_open("utf-8", fs_charset);
+	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 *

src/fs/Path.hxx

@@ -48,13 +48,6 @@ void path_global_init();
 
 void path_global_finish();
 
-/**
- * Converts a file name in the filesystem charset to UTF-8.  Returns
- * NULL on failure.
- */
-char *
-fs_charset_to_utf8(const char *path_fs);
-
 /**
  * Converts a file name in UTF-8 to the filesystem charset.  Returns a
  * duplicate of the UTF-8 string on failure.
@@ -173,6 +166,13 @@ public:
 		return Path(Donate(), utf8_to_fs_charset(utf8));
 	}
 
+	/**
+	 * Convert the path to UTF-8.
+	 * Returns empty string on error or if #path_fs is null pointer.
+	 */
+	gcc_pure
+	static std::string ToUTF8(const_pointer path_fs);
+
 	/**
 	 * Copy a #Path object.
 	 */
@@ -257,7 +257,9 @@ public:
 	 * Returns empty string on error or if this instance is "nulled"
 	 * (#IsNull returns true).
 	 */
-	std::string ToUTF8() const;
+	std::string ToUTF8() const {
+		return ToUTF8(value);
+	}
 };
 
 #endif