not fast, but it works:) any ideas on better code?
;;;;;code from
http://www.mail-archive.com/clojure@googlegroups.com/msg19378.html
;;saving objects to strings and going back -slow, but it works
(import (java.io ByteArrayOutputStream ObjectOutputStream
ByteArrayInputStream ObjectInputStream))
(use 'clojure.contrib.duck-streams)
(defn str-to-bytes [s]
(.getBytes s))
(defn str-from-bytes [b]
(new String b))
; encode a raw array of bytes as a base64 array of bytes
(defn encode64 [b]
(. (new sun.misc.BASE64Encoder) encode b))
; decode a string encoded in base 64, result as array of bytes
(defn decode64 [s]
(let [decoder (new sun.misc.BASE64Decoder)]
(. decoder decodeBuffer s)))
(defn obj-to-bytes
"convert object to string"
[obj]
(with-open [bos (ByteArrayOutputStream.)
stream (ObjectOutputStream. bos)]
(.writeObject stream obj)
(.flush stream)
(.toByteArray bos)))
(defn bytes-to-obj
"convert string to object"
[s]
(.readObject
(ObjectInputStream.
(ByteArrayInputStream.
s))))
; compress human readable string and return it as base64 encoded
(defn encode [s]
(let [b (obj-to-bytes s)
output (new java.io.ByteArrayOutputStream)
deflater (new java.util.zip.DeflaterOutputStream
output
(new java.util.zip.Deflater) 1024)]
(. deflater write b)
(. deflater close)
(str-from-bytes (encode64 (. output toByteArray)))))
; take an object that was compressed & base64 encoded.. and undo
allthat
(defn decode [s]
(let [b (decode64 s)
input (new java.io.ByteArrayInputStream b)
inflater (new java.util.zip.InflaterInputStream
input
(new java.util.zip.Inflater) 1024)
result (to-byte-array inflater)]
(. inflater close)
(bytes-to-obj result)))
(defmethod print-dup :default [o w]
(.write w (str "#=(forex.module.ea/decode \"" (encode o) "\")")))
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