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
10 ;;;; $Id: byte-stream.lisp,v 1.2 2003/08/02 22:19:37 kevin Exp $
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))
113 (eof-or-lose stream eof-errorp eof-value))
115 (setf (byte-array-input-stream-current stream) (1+ index))
116 (aref byte-array index)))))
118 (defun byte-array-binch (stream eof-errorp eof-value)
119 (let ((byte-array (byte-array-input-stream-byte-array stream))
120 (index (byte-array-input-stream-current stream)))
121 (cond ((= index (byte-array-input-stream-end stream))
122 (eof-or-lose stream eof-errorp eof-value))
124 (setf (byte-array-input-stream-current stream) (1+ index))
125 (aref byte-array index)))))
127 (defun byte-array-stream-read-n-bytes (stream buffer start requested eof-errorp)
128 (declare (type byte-array-input-stream stream))
129 (let* ((byte-array (byte-array-input-stream-byte-array stream))
130 (index (byte-array-input-stream-current stream))
131 (available (- (byte-array-input-stream-end stream) index))
132 (copy (min available requested)))
134 (setf (byte-array-input-stream-current stream)
137 (system:without-gcing
138 (system::system-area-copy (system:vector-sap byte-array)
139 (* index vm:byte-bits)
140 (if (typep buffer 'system::system-area-pointer)
142 (system:vector-sap buffer))
143 (* start vm:byte-bits)
144 (* copy vm:byte-bits)))
146 (sb-sys:without-gcing
147 (sb-kernel:system-area-copy (sb-sys:vector-sap byte-array)
148 (* index sb-vm:n-byte-bits)
149 (if (typep buffer 'sb-sys::system-area-pointer)
151 (sb-sys:vector-sap buffer))
152 (* start sb-vm:n-byte-bits)
153 (* copy sb-vm:n-byte-bits))))
154 (if (and (> requested copy) eof-errorp)
155 (error 'end-of-file :stream stream)
158 (defun byte-array-in-misc (stream operation &optional arg1 arg2)
159 (declare (ignore arg2))
163 (setf (byte-array-input-stream-current stream) arg1)
164 (byte-array-input-stream-current stream)))
165 (:file-length (length (byte-array-input-stream-byte-array stream)))
166 (:unread (decf (byte-array-input-stream-current stream)))
167 (:listen (or (/= (the fixnum (byte-array-input-stream-current stream))
168 (the fixnum (byte-array-input-stream-end stream)))
170 (:element-type 'base-char)))
172 (defun make-byte-array-input-stream (buffer &optional (start 0) (end (length buffer)))
173 "Returns an input stream which will supply the bytes of BUFFER between
174 Start and End in order."
175 (internal-make-byte-array-input-stream buffer start end))
180 ;;; Simple streams implementation by Kevin Rosenberg
185 (defclass extendable-buffer-output-stream (excl:buffer-output-simple-stream)
189 (defun make-byte-array-output-stream ()
190 "Returns an Output stream which will accumulate all output given it for
191 the benefit of the function Get-Output-Stream-Data."
192 (make-instance 'extendable-buffer-output-stream
193 :buffer (make-array 128 :element-type '(unsigned-byte 8))
194 :external-form :octets))
196 (defun get-output-stream-data (stream)
197 "Returns an array of all data sent to a stream made by
198 Make-Byte-Array-Output-Stream since the last call to this function
201 (dump-output-stream-data stream)
202 (file-position stream 0)))
204 (defun dump-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."
207 (force-output stream)
208 (let* ((length (file-position stream))
209 (result (make-array length :element-type '(unsigned-byte 8))))
210 (replace result (slot-value stream 'excl::buffer))
213 (defmethod excl:device-extend ((stream extendable-buffer-output-stream)
215 (let* ((len (file-position stream))
216 (new-len (max (+ len need) (* 2 len)))
217 (old-buf (slot-value stream 'excl::buffer))
218 (new-buf (make-array new-len :element-type '(unsigned-byte 8))))
219 (declare (fixnum len)
220 (optimize (speed 3) (safety 0)))
222 (setf (aref new-buf i) (aref old-buf i)))
223 (setf (slot-value stream 'excl::buffer) new-buf)
224 (setf (slot-value stream 'excl::buffer-ptr) new-len)
232 (defun make-byte-array-input-stream (buffer &optional (start 0)
233 (end (length buffer)))
234 (excl:make-buffer-input-stream buffer start end :octets))