/usr/share/common-lisp/source/chunga/output.lisp is in cl-chunga 1.1.6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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;;; $Header: /usr/local/cvsrep/chunga/output.lisp,v 1.14 2008/05/24 03:06:22 edi Exp $
;;; Copyright (c) 2006-2010, Dr. Edmund Weitz. 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 :chunga)
(defmethod chunked-stream-output-chunking-p ((object t))
"The default method for all objects which are not of type
CHUNKED-OUTPUT-STREAM."
nil)
(defmethod write-chunk ((stream chunked-output-stream) sequence
&key (start 0)
(end (length sequence)))
"Writes the contents of SEQUENCE from START to END to the
underlying stream of STREAM as one chunk."
(let ((output-stream (chunked-stream-stream stream)))
;; chunk size
(loop for char across (format nil "~X" (- end start))
do (write-byte (char-code char) output-stream))
(write-sequence +crlf+ output-stream)
;; data
(write-sequence sequence output-stream :start start :end end)
(write-sequence +crlf+ output-stream)))
(defmethod flush-buffer ((stream chunked-output-stream))
"Uses WRITE-CHUNK to empty the output buffer unless it is
already empty."
(with-slots (output-buffer output-index)
stream
(when (plusp output-index)
(write-chunk stream output-buffer :end output-index)
(setq output-index 0))))
(defmethod (setf chunked-stream-output-chunking-p) (new-value (stream chunked-output-stream))
"Switches output chunking for STREAM on or off."
(unless (eq (not new-value) (not (chunked-stream-output-chunking-p stream)))
(with-slots (real-stream output-index)
stream
(cond (new-value
;; get rid of "old" data
(force-output real-stream)
;; initialize output buffer as being empty
(setq output-index 0))
(t (flush-buffer stream)
;; last chunk to signal end of chunking
(write-byte #.(char-code #\0) real-stream)
(write-sequence +crlf+ real-stream)
(write-sequence +crlf+ real-stream)
(force-output real-stream)))))
(setf (slot-value stream 'output-chunking-p) new-value))
(defmethod stream-clear-output ((stream chunked-output-stream))
"We clear output by resetting the output buffer and clearing
the underlying stream."
(when (chunked-stream-output-chunking-p stream)
(setf (slot-value stream 'output-index) 0))
(clear-output (chunked-stream-stream stream)))
(defmethod stream-finish-output ((stream chunked-output-stream))
"Flush the output buffer if output chunking is on, then operate
on the underlying stream."
(when (chunked-stream-output-chunking-p stream)
(flush-buffer stream))
(finish-output (chunked-stream-stream stream)))
(defmethod stream-force-output ((stream chunked-output-stream))
"Flush the output buffer if output chunking is on, then operate
on the underlying stream."
(when (chunked-stream-output-chunking-p stream)
(flush-buffer stream))
(force-output (chunked-stream-stream stream)))
(defmethod stream-write-byte ((stream chunked-output-stream) byte)
"Writes one byte by simply adding it to the end of the output
buffer \(if output chunking is enabled). The buffer is flushed
if necessary."
(unless (chunked-stream-output-chunking-p stream)
(return-from stream-write-byte
(write-byte byte (chunked-stream-stream stream))))
(with-slots (output-index output-buffer)
stream
(when (>= output-index +output-buffer-size+)
(flush-buffer stream))
(setf (aref output-buffer output-index) byte)
(incf output-index)
byte))
(defmethod stream-write-sequence ((stream chunked-output-stream) sequence start end &key)
"Outputs SEQUENCE by appending it to the output buffer if it's
small enough. Large sequences are written directly using
WRITE-CHUNK."
(unless (chunked-stream-output-chunking-p stream)
(return-from stream-write-sequence
(write-sequence sequence (chunked-stream-stream stream) :start start :end end)))
(with-slots (output-buffer output-index)
stream
(let ((length (- end start)))
(cond ((<= length (- +output-buffer-size+ output-index))
(replace output-buffer sequence :start1 output-index
:start2 start :end2 end)
(incf output-index length))
(t (flush-buffer stream)
(write-chunk stream sequence :start start :end end)))))
sequence)
(defmethod close ((stream chunked-output-stream) &key abort)
"When a stream is closed and ABORT isn't true we have to make
sure to send the last chunk."
(unless abort
(setf (chunked-stream-output-chunking-p stream) nil))
(call-next-method))
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