1 ;;; -*- Syntax: Ansi-Common-Lisp; Base: 10; Mode: lisp; Package: kmrcl -*-
2 ;;;; *************************************************************************
3 ;;;; FILE IDENTIFICATION
5 ;;;; Name: byte-stream.lisp
6 ;;;; Purpose: Byte array input/output streams
7 ;;;; Programmer: Kevin M. Rosenberg
8 ;;;; Date Started: June 2003
12 ;;;; Works for CMUCL, SBCL, and AllergoCL only
14 ;;;; This file, part of KMRCL, is Copyright (c) 2003 by Kevin M. Rosenberg
15 ;;;; and by onShore Development, Inc.
17 ;;;; KMRCL users are granted the rights to distribute and use this software
18 ;;;; as governed by the terms of the Lisp Lesser GNU Public License
19 ;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL.
20 ;;;; *************************************************************************
24 ;; Intial CMUCL version by OnShored. Ported to SBCL by Kevin Rosenberg
28 (defstruct (byte-array-output-stream
29 (:include #+cmu system:lisp-stream
30 #+sbcl sb-impl::file-stream
31 (bout #'byte-array-bout)
32 (misc #'byte-array-out-misc))
33 (:print-function %print-byte-array-output-stream)
34 (:constructor make-byte-array-output-stream ()))
35 ;; The buffer we throw stuff in.
36 (buffer (make-array 128 :element-type '(unsigned-byte 8)))
37 ;; Index of the next location to use.
38 (index 0 :type fixnum))
40 (defun %print-byte-array-output-stream (s stream d)
41 (declare (ignore s d))
42 (write-string "#<Byte-Array-Output Stream>" stream))
44 (setf (documentation 'make-binary-output-stream 'function)
45 "Returns an Output stream which will accumulate all output given it for
46 the benefit of the function Get-Output-Stream-Data.")
48 (defun byte-array-bout (stream byte)
49 (let ((current (byte-array-output-stream-index stream))
50 (workspace (byte-array-output-stream-buffer stream)))
51 (if (= current (length workspace))
52 (let ((new-workspace (make-array (* current 2) :element-type '(unsigned-byte 8))))
53 (replace new-workspace workspace)
54 (setf (aref new-workspace current) byte)
55 (setf (byte-array-output-stream-buffer stream) new-workspace))
56 (setf (aref workspace current) byte))
57 (setf (byte-array-output-stream-index stream) (1+ current))))
59 (defun byte-array-out-misc (stream operation &optional arg1 arg2)
60 (declare (ignore arg2))
64 (byte-array-output-stream-index stream)))
65 (:element-type '(unsigned-byte 8))))
67 (defun get-output-stream-data (stream)
68 "Returns an array of all data sent to a stream made by
69 Make-Byte-Array-Output-Stream since the last call to this function and
71 (declare (type byte-array-output-stream stream))
73 (dump-output-stream-data stream)
74 (setf (byte-array-output-stream-index stream) 0)))
76 (defun dump-output-stream-data (stream)
77 "Returns an array of all data sent to a stream made by
78 Make-Byte-Array-Output-Stream since the last call to this function."
79 (declare (type byte-array-output-stream stream))
80 (let* ((length (byte-array-output-stream-index stream))
81 (result (make-array length :element-type '(unsigned-byte 8))))
82 (replace result (byte-array-output-stream-buffer stream))
90 (defstruct (byte-array-input-stream
91 (:include #+cmu system:lisp-stream
92 #+sbcl sb-impl::file-stream
93 (in #'byte-array-inch)
94 (bin #'byte-array-binch)
95 (n-bin #'byte-array-stream-read-n-bytes)
96 (misc #'byte-array-in-misc))
97 (:print-function %print-byte-array-input-stream)
99 (:constructor internal-make-byte-array-input-stream
100 (byte-array current end)))
101 (byte-array nil :type vector)
105 (defun %print-byte-array-input-stream (s stream d)
106 (declare (ignore s d))
107 (write-string "#<Byte-Array-Input Stream>" stream))
109 (defun byte-array-inch (stream eof-errorp eof-value)
110 (let ((byte-array (byte-array-input-stream-byte-array stream))
111 (index (byte-array-input-stream-current stream)))
112 (cond ((= index (byte-array-input-stream-end stream))
114 (eof-or-lose stream eof-errorp eof-value)
116 (sb-impl::eof-or-lose stream eof-errorp eof-value)
119 (setf (byte-array-input-stream-current stream) (1+ index))
120 (aref byte-array index)))))
122 (defun byte-array-binch (stream eof-errorp eof-value)
123 (let ((byte-array (byte-array-input-stream-byte-array stream))
124 (index (byte-array-input-stream-current stream)))
125 (cond ((= index (byte-array-input-stream-end stream))
127 (eof-or-lose stream eof-errorp eof-value)
129 (sb-impl::eof-or-lose stream eof-errorp eof-value)
132 (setf (byte-array-input-stream-current stream) (1+ index))
133 (aref byte-array index)))))
135 (defun byte-array-stream-read-n-bytes (stream buffer start requested eof-errorp)
136 (declare (type byte-array-input-stream stream))
137 (let* ((byte-array (byte-array-input-stream-byte-array stream))
138 (index (byte-array-input-stream-current stream))
139 (available (- (byte-array-input-stream-end stream) index))
140 (copy (min available requested)))
142 (setf (byte-array-input-stream-current stream)
145 (system:without-gcing
146 (system::system-area-copy (system:vector-sap byte-array)
147 (* index vm:byte-bits)
148 (if (typep buffer 'system::system-area-pointer)
150 (system:vector-sap buffer))
151 (* start vm:byte-bits)
152 (* copy vm:byte-bits)))
154 (sb-sys:without-gcing
155 (sb-kernel:system-area-copy (sb-sys:vector-sap byte-array)
156 (* index sb-vm:n-byte-bits)
157 (if (typep buffer 'sb-sys::system-area-pointer)
159 (sb-sys:vector-sap buffer))
160 (* start sb-vm:n-byte-bits)
161 (* copy sb-vm:n-byte-bits))))
162 (if (and (> requested copy) eof-errorp)
163 (error 'end-of-file :stream stream)
166 (defun byte-array-in-misc (stream operation &optional arg1 arg2)
167 (declare (ignore arg2))
171 (setf (byte-array-input-stream-current stream) arg1)
172 (byte-array-input-stream-current stream)))
173 (:file-length (length (byte-array-input-stream-byte-array stream)))
174 (:unread (decf (byte-array-input-stream-current stream)))
175 (:listen (or (/= (the fixnum (byte-array-input-stream-current stream))
176 (the fixnum (byte-array-input-stream-end stream)))
178 (:element-type 'base-char)))
180 (defun make-byte-array-input-stream (buffer &optional (start 0) (end (length buffer)))
181 "Returns an input stream which will supply the bytes of BUFFER between
182 Start and End in order."
183 (internal-make-byte-array-input-stream buffer start end))
188 ;;; Simple streams implementation by Kevin Rosenberg
193 (defclass extendable-buffer-output-stream (excl:buffer-output-simple-stream)
197 (defun make-byte-array-output-stream ()
198 "Returns an Output stream which will accumulate all output given it for
199 the benefit of the function Get-Output-Stream-Data."
200 (make-instance 'extendable-buffer-output-stream
201 :buffer (make-array 128 :element-type '(unsigned-byte 8))
202 :external-form :octets))
204 (defun get-output-stream-data (stream)
205 "Returns an array of all data sent to a stream made by
206 Make-Byte-Array-Output-Stream since the last call to this function
209 (dump-output-stream-data stream)
210 (file-position stream 0)))
212 (defun dump-output-stream-data (stream)
213 "Returns an array of all data sent to a stream made by
214 Make-Byte-Array-Output-Stream since the last call to this function."
215 (force-output stream)
216 (let* ((length (file-position stream))
217 (result (make-array length :element-type '(unsigned-byte 8))))
218 (replace result (slot-value stream 'excl::buffer))
221 (defmethod excl:device-extend ((stream extendable-buffer-output-stream)
223 (declare (ignore action))
224 (let* ((len (file-position stream))
225 (new-len (max (+ len need) (* 2 len)))
226 (old-buf (slot-value stream 'excl::buffer))
227 (new-buf (make-array new-len :element-type '(unsigned-byte 8))))
228 (declare (fixnum len)
229 (optimize (speed 3) (safety 0)))
231 (setf (aref new-buf i) (aref old-buf i)))
232 (setf (slot-value stream 'excl::buffer) new-buf)
233 (setf (slot-value stream 'excl::buffer-ptr) new-len)
241 (defun make-byte-array-input-stream (buffer &optional (start 0)
242 (end (length buffer)))
243 (excl:make-buffer-input-stream buffer start end :octets))