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|
;;;
;;; compressor.lisp
;;;
;;; Created: 2005-03-12 by Zach Beane <xach@xach.com>
;;;
;;; Copyright (c) 2005 Zachary Beane, All Rights Reserved
;;;
;;; Redistribution and use in source and binary forms, with or without
;;; modification, are permitted provided that the following conditions
;;; are met:
;;;
;;; * Redistributions of source code must retain the above copyright
;;; notice, this list of conditions and the following disclaimer.
;;;
;;; * Redistributions in binary form must reproduce the above
;;; copyright notice, this list of conditions and the following
;;; disclaimer in the documentation and/or other materials
;;; provided with the distribution.
;;;
;;; THIS SOFTWARE IS PROVIDED BY THE AUTHOR 'AS IS' AND ANY EXPRESSED
;;; OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
;;; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
;;; ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
;;; DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
;;; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
;;; GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
;;; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
;;; WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
;;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
;;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;;;
;;; $Id: compressor.lisp,v 1.13 2005/04/01 21:59:25 xach Exp $
(in-package :salza-deflate)
(defun compress (deflate-stream)
"Compress pending input in DEFLATE-STREAM to its output buffer."
(declare (optimize (speed 3) (safety 0) (debug 0)
#+lw-int32 (hcl:fixnum-safety 0) #+lw-int32 (float 0))
(type deflate-stream deflate-stream))
(let* ((input (deflate-stream-compress-buffer deflate-stream))
(positions (deflate-stream-compress-positions deflate-stream))
(i 0)
(j 0)
(length 0)
(distance 0)
(end (min (deflate-stream-compress-pos deflate-stream)
(length input)))
(trigram #.+ub24-0+))
(declare (type octet-vector input)
(type buffer-offset i j end)
(type (integer 0 32768) distance)
(type (integer 0 258) length)
(type ub24 trigram))
(labels ((save-trigram ()
(setf (getfixhash (ub24-fixhash trigram) positions) i))
(shift-in ()
;(setf trigram (logior (ash (logand #xFFFF trigram) 8) (aref input i)))
(setf trigram (ub24<<push trigram (aref input i)))
(incf i))
(output-literal ()
;(write-literal (ash (logand #xFF0000 trigram) -16) deflate-stream)
(write-literal (ub-octet 16 trigram) deflate-stream))
(output-length/distance (length distance)
(write-length length deflate-stream)
(write-distance distance deflate-stream)))
(declare (inline save-trigram shift-in output-literal
output-length/distance))
(when (< end 4)
(dotimes (k end)
(write-literal (aref input k) deflate-stream))
(return-from compress))
(shift-in)
(shift-in)
(shift-in)
(tagbody
loop
(setf j (getfixhash (ub24-fixhash trigram) positions))
(when (or (zerop j) (> (the fixnum (- i j)) 32768))
(output-literal)
(save-trigram)
(when (= i end)
;(write-literal (ash (logand #xFF00 trigram) -8) deflate-stream)
(write-literal (ub-octet 8 trigram) deflate-stream)
;(write-literal (logand #xFF trigram) deflate-stream)
(write-literal (ub-octet 0 trigram) deflate-stream)
(return-from compress))
(shift-in)
(go loop))
(setf length 3
distance (- i j))
match-loop
(when (and (< i end)
(= (aref input i) (aref input j))
(< length 258))
(save-trigram)
(shift-in)
(incf j)
(incf length)
(go match-loop))
(output-length/distance length distance)
(cond ((= i end)
(return-from compress))
((> (the fixnum (+ 3 i)) end)
(do ((k i (1+ k)))
((>= k end))
(declare (fixnum k))
(write-literal (aref input k) deflate-stream))
;(dotimes (k (- end i))
; (write-literal (aref input (+ k i)) deflate-stream))
(return-from compress)))
(dotimes (k 3)
(declare (fixnum k))
(save-trigram)
(shift-in))
(go loop)))))
(defun compress-input (deflate-stream)
"Output the pending input of DEFLATE-STREAM to its bitstream. Resets the
position cache."
(compress deflate-stream)
(clrfixhash (deflate-stream-compress-positions deflate-stream))
(setf (deflate-stream-compress-pos deflate-stream) 0))
(defun compress-sequence (sequence deflate-stream start end)
"Add the octet sequence SEQUENCE to DEFLATE-STREAM. May signal a
continuable error of type DEFLATE-STREAM-BUFFER-FULL."
(symbol-macrolet ((pos (deflate-stream-compress-pos deflate-stream))
(buffer (deflate-stream-compress-buffer deflate-stream)))
(let ((space-left (- (length buffer) pos)))
(loop
(octet-replace buffer sequence
pos *compressor-buffer-size*
start (min end (+ start space-left)))
(cond ((<= space-left (- end start))
(incf start space-left)
(incf pos space-left)
(compress-input deflate-stream)
(setf space-left (- (length buffer) pos)))
(t
(incf pos (- end start))
(return)))))))
(defun finish-compress (deflate-stream)
"Write out any pending input in COMPRESSOR to its bitstream. May
signal BITSTREAM-BUFFER-FULL."
(compress-input deflate-stream))
#|
(setq trigram (sys:integer-to-int32 #x70fdfe))
(format nil "~x" (ub-octet 16 trigram))
(format nil "~x" (ub24<<push trigram #x1e))
(disassemble 'compress)
;;; , 5
(defmacro make-fixhash-table (&rest args) `(make-hash-table ,@args))
(defmacro getfixhash (k fixhash-table) `(gethash ,k ,fixhash-table 0))
(defmacro clrfixhash (fixhash-table) `(clrhash ,fixhash-table))
(defun (setf fixhash:getfixhash) (new-value k fixhash-table)
(setf (gethash k fixhash-table) new-value))
(setq fht (make-fixhash-table))
(ash (logand #x7FFFF x) 8)
(defun test (x y)
(declare (fixnum x)
(optimize (speed 3) (safety 0) (debug 0) (hcl:fixnum-safety 0) (float 0)))
(let ((i32 (sys:integer-to-int32 x)))
(getfixhash (the fixnum (sys:int32-to-integer (sys:int32+ i32 most-negative-fixnum)))
y)
(write-literal (the (integer 0 258)
(sys:int32-to-integer (sys:int32-logand #xFF0000 x))) y)
) )
(disassemble 'test)
|#
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