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;;; -*- Mode: LISP; Syntax: COMMON-LISP; Package: CHUNGA; Base: 10 -*-
;;; $Header: /usr/local/cvsrep/chunga/streams.lisp,v 1.7 2007/01/01 23:39:36 edi Exp $
;;; Copyright (c) 2006-2007, 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)
(defclass chunked-stream (trivial-gray-stream-mixin)
((real-stream :initarg :real-stream
:reader chunked-stream-stream
:documentation "The actual stream that's used for
input and/or output."))
(:documentation "Every chunked stream returned by
MAKE-CHUNKED-STREAM is of this type which is a subtype of
STREAM."))
(defclass chunked-input-stream (chunked-stream fundamental-binary-input-stream)
((input-stream :accessor chunked-stream-input-stream
:documentation "The underlying stream \(see
REAL-STREAM) used for input, maybe wrapped with a flexi stream.")
(input-chunking-p :initform nil
:reader chunked-stream-input-chunking-p
:documentation "Whether input chunking is currently enabled.")
(input-buffer :initform nil
:documentation "A vector containing the binary
data from the most recent chunk that was read.")
(input-index :initform 0
:accessor chunked-stream-input-index
:documentation "The current position within INPUT-BUFFER.")
(input-limit :initform 0
:accessor chunked-stream-input-limit
:documentation "Only the content in INPUT-BUFFER
up to INPUT-LIMIT belongs to the current chunk.")
(chunk-extensions :initform nil
:reader chunked-input-stream-extensions
:documentation "An alist of attribute/value
pairs corresponding to the optional `chunk extensions' which
might be encountered when reading from a chunked stream.")
(chunk-trailers :initform nil
:reader chunked-input-stream-trailers
:documentation "An alist of attribute/value
pairs corresponding to the optional `trailer' HTTP headers which
might be encountered at the end of a chunked stream.")
(expecting-crlf-p :initform nil
:accessor expecting-crlf-p
:documentation "Whether we expect to see
CRLF before we can read the next chunk-size header part from the
stream. \(This will actually be the CRLF from the end of the
last chunk-data part.)"))
(:documentation "A chunked stream is of this type if its
underlying stream is an input stream. This is a subtype of
CHUNKED-STREAM."))
(defclass chunked-output-stream (chunked-stream fundamental-binary-output-stream)
((output-stream :accessor chunked-stream-output-stream
:documentation "The underlying stream \(see
REAL-STREAM) used for output, maybe wrapped with a flexi stream.")
(output-chunking-p :initform nil
:reader chunked-stream-output-chunking-p
:documentation "Whether output chunking is
currently enabled.")
(output-buffer :initform (make-array +output-buffer-size+ :element-type 'octet)
:accessor output-buffer
:documentation "A vector used to temporary
store data which will output in one chunk.")
(output-index :initform 0
:accessor output-index
:documentation "The current end of OUTPUT-BUFFER."))
(:documentation "A chunked stream is of this type if its
underlying stream is an output stream. This is a subtype of
CHUNKED-STREAM."))
(defclass chunked-io-stream (chunked-input-stream chunked-output-stream)
()
(:documentation "A chunked stream is of this type if it is both
a CHUNKED-INPUT-STREAM as well as a CHUNKED-OUTPUT-STREAM."))
(defmethod stream-element-type ((stream chunked-stream))
"Chunked streams are always binary streams. Wrap them with
flexi streams if you need a character stream."
'octet)
(defmethod open-stream-p ((stream chunked-stream))
"A chunked stream is open if its underlying stream is open."
(open-stream-p (chunked-stream-stream stream)))
(defmethod close ((stream chunked-stream) &key abort)
"If a chunked stream is closed, we close the underlying stream as well."
(with-slots (real-stream)
stream
(cond ((open-stream-p real-stream)
(close real-stream :abort abort))
(t nil))))
(define-condition input-chunking-unexpected-end-of-file (stream-error)
()
(:documentation "A condition of this type is signaled if we
reach an unexpected EOF on a chunked stream with input chunking
enabled. This is a subtype of STREAM-ERROR, so
STREAM-ERROR-STREAM can be used to access the offending
stream."))
(define-condition input-chunking-body-corrupted (stream-error)
((last-char :initarg :last-char
:documentation "The \(unexpected) character which was read.")
(expected-chars :initarg :expected-chars
:documentation "The characters which were
expected. A list of characters or one single character."))
(:report (lambda (condition stream)
(with-slots (last-char expected-chars)
condition
(format stream "Chunked stream ~S seems to be corrupted.
Read character ~S, but expected ~:[a member of ~S~;~S~]."
(stream-error-stream condition)
last-char (atom expected-chars) expected-chars))))
(:documentation "A condition of this type is signaled if an
unexpected character \(octet) is read while reading from a
chunked stream with input chunking enabled. This is a subtype of
STREAM-ERROR, so STREAM-ERROR-STREAM can be used to access the
offending stream."))
(defmethod initialize-instance :after ((stream chunked-input-stream) &rest initargs)
"Initializes the INPUT-STREAM slot."
(declare (ignore initargs))
(setf (chunked-stream-input-stream stream)
(chunked-stream-stream stream)))
(defmethod initialize-instance :after ((stream chunked-output-stream) &rest initargs)
"Initializes the INPUT-STREAM slot."
(declare (ignore initargs))
(setf (chunked-stream-output-stream stream)
(chunked-stream-stream stream)))
(defun make-chunked-stream (stream)
"Creates and returns a chunked stream \(a stream of type
CHUNKED-STREAM) which wraps STREAM. STREAM must be an open
binary stream."
(unless (and (streamp stream)
(open-stream-p stream))
(error "~S should have been an open stream." stream))
(make-instance ;; actual type depends on STREAM
(cond ((and (input-stream-p stream)
(output-stream-p stream))
'chunked-io-stream)
((input-stream-p stream)
'chunked-input-stream)
((output-stream-p stream)
'chunked-output-stream))
:real-stream stream))
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