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(in-package :zip)
(defclass buffer-output-stream
(trivial-gray-stream-mixin fundamental-binary-output-stream)
((buf :initarg :buf :accessor buf)
(pos :initform 0 :accessor pos)))
;; fallback method just in case the lisp doesn't have or doesn't use
;; stream-write-sequence:
(defmethod stream-write-byte
((stream buffer-output-stream) byte)
(stream-write-sequence stream (vector byte) 0 1)
byte)
(defmethod stream-write-sequence
((stream buffer-output-stream) seq start end &key)
(replace (buf stream)
seq
:start1 (pos stream)
:start2 start
:end2 end)
(incf (pos stream) (- end start))
seq)
(defun make-buffer-output-stream (outbuf)
(make-instance 'buffer-output-stream :buf outbuf))
(defclass truncating-stream
(trivial-gray-stream-mixin fundamental-binary-input-stream)
((input-handle :initarg :input-handle :accessor input-handle)
(size :initarg :size :accessor size)
(pos :initform 0 :accessor pos)))
(defmethod stream-read-byte ((s truncating-stream))
(if (< (pos s) (size s))
(prog1
(read-byte (input-handle s))
(incf (pos s)))
nil))
(defmethod stream-read-sequence ((s truncating-stream) seq start end &key)
(let* ((n (- end start))
(max (- (size s) (pos s)))
(result
(read-sequence seq
(input-handle s)
:start start
:end (+ start (min n max)))))
(incf (pos s) (- result start))
result))
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