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diff --git a/gruel/src/scheme/gnuradio/pmt-serialize.scm b/gruel/src/scheme/gnuradio/pmt-serialize.scm
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+++ b/gruel/src/scheme/gnuradio/pmt-serialize.scm
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+;;;
+;;; Copyright 2007 Free Software Foundation, Inc.
+;;; 
+;;; This file is part of GNU Radio
+;;; 
+;;; GNU Radio 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 3, or (at your option)
+;;; any later version.
+;;; 
+;;; GNU Radio 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.
+;;;
+
+;;; An implementation of pmt_serialize in scheme.
+;;; Currently handles only symbols and pairs.  They're all we need for now.
+
+(define-module (gnuradio pmt-serialize)
+  :export (pmt-serialize))
+
+(load-from-path "gnuradio/pmt-serial-tags")
+
+(define (pmt-serialize obj put-byte)
+  (define (put-u16 x)
+    (put-byte (logand (ash x -8) #xff))
+    (put-byte (logand x #xff)))
+    
+  (cond ((null? obj)
+	 (put-byte pst-null))
+	((symbol? obj)
+	 (let* ((sym-as-bytes (map char->integer (string->list (symbol->string obj))))
+		(len (length sym-as-bytes)))
+	   (put-byte pst-symbol)
+	   (put-u16 len)
+	   (for-each put-byte sym-as-bytes)))
+	
+	((pair? obj)
+	 (put-byte pst-pair)
+	 (pmt-serialize (car obj) put-byte)
+	 (pmt-serialize (cdr obj) put-byte))
+	(else
+	 (throw 'not-implemented "pmt-serialize" obj))))