read-chunks.clj

(def ^:dynamic chunk-size 17)

(defn next-chunk [rdr]
  (let [buf (char-array chunk-size)
        s   (.read rdr buf)]
    (when (pos? s)
      (java.nio.CharBuffer/wrap buf 0 s))))

(defn chunk-seq [rdr]
  (when-let [chunk (next-chunk rdr)]
    (cons chunk (lazy-seq (chunk-seq rdr)))))

(with-open [rdr (clojure.java.io/reader "/Users/prokopov/.profile")]
  (doseq [chunk (chunk-seq rdr)]
    (println "Read" (.remaining chunk) "bytes:" (str chunk))))