/usr/share/common-lisp/source/salza2/user.lisp is in cl-salza2 2.0.9-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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;;; Copyright (c) 2007 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.
;;;
(in-package #:salza2)
(defun make-stream-output-callback (stream)
"Return a function suitable for use as a compressor callback that
writes all compressed data to STREAM."
(lambda (buffer end)
(write-sequence buffer stream :end end)))
(defun gzip-stream (input output)
(let ((callback (make-stream-output-callback output))
(buffer (make-array 8192 :element-type '(unsigned-byte 8))))
(with-compressor (compressor 'gzip-compressor
:callback callback)
(loop
(let ((end (read-sequence buffer input)))
(when (zerop end)
(return))
(compress-octet-vector buffer compressor :end end))))))
(defun gzip-file (input output &key (if-exists :supersede))
(with-open-file (istream input :element-type '(unsigned-byte 8))
(with-open-file (ostream output
:element-type '(unsigned-byte 8)
:direction :output
:if-exists if-exists)
(gzip-stream istream ostream)))
(probe-file output))
(defun compressor-designator-compressor (designator initargs)
(etypecase designator
(symbol (apply #'make-instance designator initargs))
(deflate-compressor designator)))
(defun compress-data (data compressor-designator &rest initargs)
(let ((chunks '())
(size 0)
(compressor (compressor-designator-compressor compressor-designator
initargs)))
(setf (callback compressor)
(lambda (buffer end)
(incf size end)
(push (subseq buffer 0 end)
chunks)))
(compress-octet-vector data compressor)
(finish-compression compressor)
(let ((compressed (make-array size :element-type '(unsigned-byte 8)))
(start 0))
(dolist (chunk (nreverse chunks))
(replace compressed chunk :start1 start)
(incf start (length chunk)))
compressed)))
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