--- /dev/null
+;;; -*- Syntax: Ansi-Common-Lisp; Base: 10; Mode: lisp; Package: kmrcl -*-
+;;;; *************************************************************************
+;;;; FILE IDENTIFICATION
+;;;;
+;;;; Name: byte-stream.lisp
+;;;; Purpose: Byte array input/output streams
+;;;; Programmer: Kevin M. Rosenberg
+;;;; Date Started: June 2003
+;;;;
+;;;; $Id: byte-stream.lisp,v 1.1 2003/07/05 02:32:08 kevin Exp $
+;;;;
+;;;; Works for CMUCL, SBCL, and AllergoCL only
+;;;;
+;;;; This file, part of KMRCL, is Copyright (c) 2003 by Kevin M. Rosenberg
+;;;; and by onShore Development, Inc.
+;;;;
+;;;; KMRCL users are granted the rights to distribute and use this software
+;;;; as governed by the terms of the Lisp Lesser GNU Public License
+;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL.
+;;;; *************************************************************************
+
+(in-package #:kmrcl)
+
+#+(or cmu sbcl)
+(progn
+(defstruct (byte-array-output-stream
+ (:include #+cmu system:lisp-stream
+ #+sbcl sb-impl::file-stream
+ (bout #'byte-array-bout)
+ (misc #'byte-array-out-misc))
+ (:print-function %print-byte-array-output-stream)
+ (:constructor make-byte-array-output-stream ()))
+ ;; The buffer we throw stuff in.
+ (buffer (make-array 128 :element-type '(unsigned-byte 8)))
+ ;; Index of the next location to use.
+ (index 0 :type fixnum))
+
+(defun %print-byte-array-output-stream (s stream d)
+ (declare (ignore s d))
+ (write-string "#<Byte-Array-Output Stream>" stream))
+
+(setf (documentation 'make-binary-output-stream 'function)
+ "Returns an Output stream which will accumulate all output given it for
+ the benefit of the function Get-Output-Stream-Data.")
+
+(defun byte-array-bout (stream byte)
+ (let ((current (byte-array-output-stream-index stream))
+ (workspace (byte-array-output-stream-buffer stream)))
+ (if (= current (length workspace))
+ (let ((new-workspace (make-array (* current 2) :element-type '(unsigned-byte 8))))
+ (replace new-workspace workspace)
+ (setf (aref new-workspace current) byte)
+ (setf (byte-array-output-stream-buffer stream) new-workspace))
+ (setf (aref workspace current) byte))
+ (setf (byte-array-output-stream-index stream) (1+ current))))
+
+(defun byte-array-out-misc (stream operation &optional arg1 arg2)
+ (declare (ignore arg2))
+ (case operation
+ (:file-position
+ (if (null arg1)
+ (byte-array-output-stream-index stream)))
+ (:element-type '(unsigned-byte 8))))
+
+(defun get-output-stream-data (stream)
+ "Returns an array of all data sent to a stream made by
+Make-Byte-Array-Output-Stream since the last call to this function and
+clears buffer."
+ (declare (type byte-array-output-stream stream))
+ (prog1
+ (dump-output-stream-data stream)
+ (setf (byte-array-output-stream-index stream) 0)))
+
+(defun dump-output-stream-data (stream)
+ "Returns an array of all data sent to a stream made by
+Make-Byte-Array-Output-Stream since the last call to this function."
+ (declare (type byte-array-output-stream stream))
+ (let* ((length (byte-array-output-stream-index stream))
+ (result (make-array length :element-type '(unsigned-byte 8))))
+ (replace result (byte-array-output-stream-buffer stream))
+ result))
+
+) ; progn
+
+
+#+(or cmu sbcl)
+(progn
+ (defstruct (byte-array-input-stream
+ (:include #+cmu system:lisp-stream
+ #+sbcl sb-impl::file-stream
+ (in #'byte-array-inch)
+ (bin #'byte-array-binch)
+ (n-bin #'byte-array-stream-read-n-bytes)
+ (misc #'byte-array-in-misc))
+ (:print-function %print-byte-array-input-stream)
+ ;(:constructor nil)
+ (:constructor internal-make-byte-array-input-stream
+ (byte-array current end)))
+ (byte-array nil :type vector)
+ (current nil)
+ (end nil))
+
+(defun %print-byte-array-input-stream (s stream d)
+ (declare (ignore s d))
+ (write-string "#<Byte-Array-Input Stream>" stream))
+
+(defun byte-array-inch (stream eof-errorp eof-value)
+ (let ((byte-array (byte-array-input-stream-byte-array stream))
+ (index (byte-array-input-stream-current stream)))
+ (cond ((= index (byte-array-input-stream-end stream))
+ (eof-or-lose stream eof-errorp eof-value))
+ (t
+ (setf (byte-array-input-stream-current stream) (1+ index))
+ (aref byte-array index)))))
+
+(defun byte-array-binch (stream eof-errorp eof-value)
+ (let ((byte-array (byte-array-input-stream-byte-array stream))
+ (index (byte-array-input-stream-current stream)))
+ (cond ((= index (byte-array-input-stream-end stream))
+ (eof-or-lose stream eof-errorp eof-value))
+ (t
+ (setf (byte-array-input-stream-current stream) (1+ index))
+ (aref byte-array index)))))
+
+(defun byte-array-stream-read-n-bytes (stream buffer start requested eof-errorp)
+ (declare (type byte-array-input-stream stream))
+ (let* ((byte-array (byte-array-input-stream-byte-array stream))
+ (index (byte-array-input-stream-current stream))
+ (available (- (byte-array-input-stream-end stream) index))
+ (copy (min available requested)))
+ (when (plusp copy)
+ (setf (byte-array-input-stream-current stream)
+ (+ index copy))
+ #+cmu
+ (system:without-gcing
+ (system::system-area-copy (system:vector-sap byte-array)
+ (* index vm:byte-bits)
+ (if (typep buffer 'system::system-area-pointer)
+ buffer
+ (system:vector-sap buffer))
+ (* start vm:byte-bits)
+ (* copy vm:byte-bits)))
+ #+sbcl
+ (sb-sys:without-gcing
+ (sb-kernel:system-area-copy (sb-sys:vector-sap byte-array)
+ (* index sb-vm:n-byte-bits)
+ (if (typep buffer 'sb-sys::system-area-pointer)
+ buffer
+ (sb-sys:vector-sap buffer))
+ (* start sb-vm:n-byte-bits)
+ (* copy sb-vm:n-byte-bits))))
+ (if (and (> requested copy) eof-errorp)
+ (error 'end-of-file :stream stream)
+ copy)))
+
+(defun byte-array-in-misc (stream operation &optional arg1 arg2)
+ (declare (ignore arg2))
+ (case operation
+ (:file-position
+ (if arg1
+ (setf (byte-array-input-stream-current stream) arg1)
+ (byte-array-input-stream-current stream)))
+ (:file-length (length (byte-array-input-stream-byte-array stream)))
+ (:unread (decf (byte-array-input-stream-current stream)))
+ (:listen (or (/= (the fixnum (byte-array-input-stream-current stream))
+ (the fixnum (byte-array-input-stream-end stream)))
+ :eof))
+ (:element-type 'base-char)))
+
+(defun make-byte-array-input-stream (buffer &optional (start 0) (end (length buffer)))
+ "Returns an input stream which will supply the bytes of BUFFER between
+ Start and End in order."
+ (internal-make-byte-array-input-stream buffer start end))
+
+) ;; progn
+
+#+allegro
+(progn
+
+ (defclass extendable-buffer-output-stream (excl:buffer-output-simple-stream)
+ ()
+ )
+
+ (defun make-byte-array-output-stream ()
+ "Returns an Output stream which will accumulate all output given it for
+ the benefit of the function Get-Output-Stream-Data."
+ (make-instance 'extendable-buffer-output-stream
+ :buffer (make-array 128 :element-type '(unsigned-byte 8))
+ :external-form :octets))
+
+ (defun get-output-stream-data (stream)
+ "Returns an array of all data sent to a stream made by
+Make-Byte-Array-Output-Stream since the last call to this function
+and clears buffer."
+ (prog1
+ (dump-output-stream-data stream)
+ (file-position stream 0)))
+
+ (defun dump-output-stream-data (stream)
+ "Returns an array of all data sent to a stream made by
+Make-Byte-Array-Output-Stream since the last call to this function."
+ (force-output stream)
+ (let* ((length (file-position stream))
+ (result (make-array length :element-type '(unsigned-byte 8))))
+ (replace result (slot-value stream 'excl::buffer))
+ result))
+
+ (defmethod excl:device-extend ((stream extendable-buffer-output-stream)
+ need action)
+ (let* ((len (file-position stream))
+ (new-len (max (+ len need) (* 2 len)))
+ (old-buf (slot-value stream 'excl::buffer))
+ (new-buf (make-array new-len :element-type '(unsigned-byte 8))))
+ (declare (fixnum len)
+ (optimize (speed 3) (safety 0)))
+ (dotimes (i len)
+ (setf (aref new-buf i) (aref old-buf i)))
+ (setf (slot-value stream 'excl::buffer) new-buf)
+ (setf (slot-value stream 'excl::buffer-ptr) new-len)
+ )
+ t)
+
+)
+
+#+allegro
+(progn
+ (defun make-byte-array-input-stream (buffer &optional (start 0)
+ (end (length buffer)))
+ (excl:make-buffer-input-stream buffer start end :octets))
+ ) ;; progn
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