+
+// translation helpers
+string prvm_language;
+string language_filename(string s);
+string CTX(string s);
+#define ZCTX(s) strzone(CTX(s))
+
+// x-encoding (encoding as zero length invisible string)
+// encodes approx. 14 bits into 5 bytes of color code string
+const float XENCODE_MAX = 21295; // 2*22*22*22-1
+const float XENCODE_LEN = 5;
+string xencode(float f);
+float xdecode(string s);
+
+#ifndef COMPAT_XON010_CHANNELS
+#define sound(e,c,s,v,a) sound7(e,c,s,v,a,0,0)
+#endif