-typedef voidpf (ZCALLBACK *open_file_func) OF((voidpf opaque, const char* filename, int mode));
-typedef uLong (ZCALLBACK *read_file_func) OF((voidpf opaque, voidpf stream, void* buf, uLong size));
-typedef uLong (ZCALLBACK *write_file_func) OF((voidpf opaque, voidpf stream, const void* buf, uLong size));
-typedef long (ZCALLBACK *tell_file_func) OF((voidpf opaque, voidpf stream));
-typedef long (ZCALLBACK *seek_file_func) OF((voidpf opaque, voidpf stream, uLong offset, int origin));
-typedef int (ZCALLBACK *close_file_func) OF((voidpf opaque, voidpf stream));
-typedef int (ZCALLBACK *testerror_file_func) OF((voidpf opaque, voidpf stream));
+typedef voidpf (ZCALLBACK *open_file_func) (voidpf opaque, const char* filename, int mode);
+typedef uLong (ZCALLBACK *read_file_func) (voidpf opaque, voidpf stream, void* buf, uLong size);
+typedef uLong (ZCALLBACK *write_file_func) (voidpf opaque, voidpf stream, const void* buf, uLong size);
+typedef long (ZCALLBACK *tell_file_func) (voidpf opaque, voidpf stream);
+typedef long (ZCALLBACK *seek_file_func) (voidpf opaque, voidpf stream, uLong offset, int origin);
+typedef int (ZCALLBACK *close_file_func) (voidpf opaque, voidpf stream);
+typedef int (ZCALLBACK *testerror_file_func) (voidpf opaque, voidpf stream);