/usr/share/common-lisp/source/chipz/stream.lisp is in cl-chipz 20130128-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 | ;;;; stream.lisp -- gray stream wrappers for INFLATE
(in-package :chipz)
(eval-when (:compile-toplevel :load-toplevel)
#-chipz-system:gray-streams
(error "gray streams are not supported in this lisp implementation"))
;;; portability definitions
#+cmu
(eval-when (:compile-toplevel :load-toplevel :execute)
(require :gray-streams))
;;; TRIVIAL-GRAY-STREAMS has it, we might as well, too...
#+allegro
(eval-when (:compile-toplevel :load-toplevel :execute)
(unless (fboundp 'excl:stream-write-string)
(require "streamc.fasl")))
(eval-when (:compile-toplevel :load-toplevel :execute)
(defvar *binary-input-stream-class*
#+lispworks 'stream:fundamental-binary-input-stream
#+sbcl 'sb-gray:fundamental-binary-input-stream
#+openmcl 'gray:fundamental-binary-input-stream
#+cmu 'ext:fundamental-binary-input-stream
#+allegro 'excl:fundamental-binary-input-stream
#+clisp 'gray:fundamental-binary-input-stream)
(defvar *stream-read-byte-function*
#+lispworks 'stream:stream-read-byte
#+sbcl 'sb-gray:stream-read-byte
#+openmcl 'gray:stream-read-byte
#+cmu 'ext:stream-read-byte
#+allegro 'excl:stream-read-byte
#+clisp 'gray:stream-read-byte)
(defvar *stream-read-sequence-function*
#+lispworks 'stream:stream-read-sequence
#+sbcl 'sb-gray:stream-read-sequence
#+openmcl 'ccl:stream-read-vector
#+cmu 'ext:stream-read-sequence
#+allegro 'excl:stream-read-sequence
#+clisp 'gray:stream-read-byte-sequence)
) ; EVAL-WHEN
;;; READ-SEQUENCE
(defmacro define-stream-read-sequence (specializer &body body)
(let ((definition
`(cond
((not (typep seq 'simple-octet-vector))
(call-next-method))
(t
(let ((end (or end (length seq))))
,@body)))))
#+(or cmu sbcl allegro)
`(defmethod #.*stream-read-sequence-function* ((stream ,specializer) seq &optional (start 0) end)
,definition)
#+(or lispworks openmcl)
`(defmethod #.*stream-read-sequence-function* ((stream ,specializer) seq start end)
,definition)
#+clisp
`(defmethod #.*stream-read-sequence-function* ((stream ,specializer) seq
&optional (start 0) end
,(gensym "no-hang")
,(gensym "interactive"))
,definition)))
;;; class definition
(defclass decompressing-stream (#.*binary-input-stream-class*)
((wrapped-stream :initarg :stream :reader wrapped-stream)
(dstate :initarg :dstate :reader dstate)
(dfun :initarg :dfun :reader dfun)
(input-buffer :initform (make-array 4096 :element-type '(unsigned-byte 8))
:reader input-buffer)
(input-buffer-index :initform 0 :accessor input-buffer-index)
(input-buffer-n-bytes :initform 0 :accessor input-buffer-n-bytes)
(output-buffer :initform (make-array 4096 :element-type '(unsigned-byte 8))
:reader output-buffer)
(output-buffer-index :initform 0 :accessor output-buffer-index)
(output-buffer-n-bytes :initform 0 :accessor output-buffer-n-bytes)))
;;; constructors
(defun make-decompressing-stream (format stream)
(multiple-value-bind (state dfun)
(ecase format
((:deflate :zlib :gzip deflate zlib gzip)
(values (make-inflate-state format) #'%inflate))
((:bzip2 bzip2)
(values (make-bzip2-state) #'%bzip2-decompress)))
(make-instance 'decompressing-stream
:stream stream
:dstate state
:dfun dfun)))
;;; stream management
(defun output-available-p (stream)
(/= (output-buffer-index stream) (output-buffer-n-bytes stream)))
(defun input-available-p (stream)
(/= (input-buffer-index stream) (input-buffer-n-bytes stream)))
(defun refill-stream-input-buffer (stream)
(with-slots (input-buffer wrapped-stream
input-buffer-index input-buffer-n-bytes)
stream
(let ((n-bytes-read (read-sequence input-buffer wrapped-stream)))
(setf input-buffer-index 0 input-buffer-n-bytes n-bytes-read)
#+nil
(format *trace-output* "index: ~D | n-bytes ~D~%"
input-buffer-index input-buffer-n-bytes)
(values))))
(defun refill-stream-output-buffer (stream)
(unless (input-available-p stream)
(refill-stream-input-buffer stream))
(multiple-value-bind (bytes-read bytes-output)
(funcall (the function (dfun stream))
(dstate stream)
(input-buffer stream)
(output-buffer stream)
:input-start (input-buffer-index stream)
:input-end (input-buffer-n-bytes stream))
(setf (output-buffer-index stream) 0
(output-buffer-n-bytes stream) bytes-output
(input-buffer-index stream) (+ (input-buffer-index stream) bytes-read))
(assert (<= (input-buffer-index stream) (input-buffer-n-bytes stream)))))
;;; methods
(defun read-and-decompress-byte (stream)
(flet ((maybe-done ()
(when (output-available-p stream)
(return-from read-and-decompress-byte
(aref (output-buffer stream)
(prog1 (output-buffer-index stream)
(incf (output-buffer-index stream))))))))
;; several input buffers may be used up before output is available
;; => read-byte should refill "something" while at all possible,
;; like read-sequence already does.
(loop initially (maybe-done)
do (refill-stream-output-buffer stream)
(maybe-done)
(unless (input-available-p stream)
(refill-stream-input-buffer stream))
;; If we didn't refill, then we must be all done.
(unless (input-available-p stream)
(finish-dstate (dstate stream))
(return :eof)))))
(defun copy-existing-output (stream seq start end)
(declare (type simple-octet-vector seq))
(let ((amount (min (- end start)
(- (output-buffer-n-bytes stream)
(output-buffer-index stream)))))
(replace seq (output-buffer stream)
:start1 start :end1 end
:start2 (output-buffer-index stream)
:end2 (output-buffer-n-bytes stream))
(incf (output-buffer-index stream) amount)
(+ start amount)))
(define-stream-read-sequence decompressing-stream
(unless (typep seq 'simple-octet-vector)
(return-from #.*stream-read-sequence-function* (call-next-method)))
(loop initially (when (output-available-p stream)
(setf start (copy-existing-output stream seq
start end)))
while (< start end)
do (unless (input-available-p stream)
(refill-stream-input-buffer stream))
;; If we didn't refill, then we must be all done.
(unless (input-available-p stream)
(finish-dstate (dstate stream))
(loop-finish))
;; Decompress directly into the user-provided buffer.
(multiple-value-bind (bytes-read bytes-output)
(funcall (the function (dfun stream))
(dstate stream)
(input-buffer stream)
seq
:input-start (input-buffer-index stream)
:input-end (input-buffer-n-bytes stream)
:output-start start
:output-end end)
(incf (input-buffer-index stream) bytes-read)
(incf start bytes-output))
finally (return start)))
(defmethod #.*stream-read-byte-function* ((stream decompressing-stream))
(read-and-decompress-byte stream))
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