chore(fmod): add files from Chensne/DragonNest

lib/flac-1.2.1/include/share/utf8.h

@@ -0,0 +1,25 @@
+#ifndef SHARE__UTF8_H
+#define SHARE__UTF8_H
+
+/*
+ * Convert a string between UTF-8 and the locale's charset.
+ * Invalid bytes are replaced by '#', and characters that are
+ * not available in the target encoding are replaced by '?'.
+ *
+ * If the locale's charset is not set explicitly then it is
+ * obtained using nl_langinfo(CODESET), where available, the
+ * environment variable CHARSET, or assumed to be US-ASCII.
+ *
+ * Return value of conversion functions:
+ *
+ *  -1 : memory allocation failed
+ *   0 : data was converted exactly
+ *   1 : valid data was converted approximately (using '?')
+ *   2 : input was invalid (but still converted, using '#')
+ *   3 : unknown encoding (but still converted, using '?')
+ */
+
+int utf8_encode(const char *from, char **to);
+int utf8_decode(const char *from, char **to);
+
+#endif