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mb-util.lisp
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mb-util.lisp
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(in-package "SB-IMPL")
(defmacro define-multibyte-mapper (name list)
(let* ((list (sort (copy-list list) #'< :key #'car))
(hi (loop for x in list maximize (max (car x) (cadr x))))
(array (make-array `(,(length list) 2)
:element-type `(integer 0 ,hi)
:initial-contents list)))
;; This used to invoke MAKE-ARRAY in the defining form, but a quoted constant
;; is better - it's literal and therefore implicitly readonly.
;; And the cross-compiler dumps specialized arrays correctly these days,
;; but guess what, this is compiled in warm build anyway, so who even cares
;; what the cross-compiler used to not be OK with?
`(defconstant-eqx ,name ,array #'equalp)))
(defun get-multibyte-mapper (table code)
(declare (optimize speed #.*safety-0*)
(type (array * (* 2)) table)
(type fixnum code))
(labels ((recur (start end)
(declare (type fixnum start end))
(let* ((m (ash (+ start end) -1))
(x (aref table m 0)))
(declare (type fixnum m x))
(cond ((= x code)
(aref table m 1))
((and (< x code) (< m end))
(recur (1+ m) end))
((and (> x code) (> m start))
(recur start (1- m)))))))
(recur 0 (1- (array-dimension table 0)))))
(eval-when (:compile-toplevel :load-toplevel :execute)
;; FIXME: better to change make-od-name() to accept multiple
;; arguments in octets.lisp?
(defun make-od-name-list (&rest syms)
(reduce #'make-od-name syms))
(defun define-bytes-per-mb-character-1 (accessor type format
mb-len mb-continuation-byte-p)
(let ((name (make-od-name-list 'bytes-per format 'character accessor))
(invalid-mb-starter-byte
(make-od-name-list 'invalid format 'starter-byte))
(invalid-mb-continuation-byte
(make-od-name-list 'invalid format 'continuation-byte)))
`(progn
;;(declaim (inline ,name))
(defun ,name (array pos end replacement)
(declare (optimize speed #.*safety-0*)
(type ,type array)
(type array-range pos end))
;; returns the number of bytes consumed and nil if it's a
;; valid character or the number of bytes consumed and a
;; replacement string if it's not.
(let ((initial-byte (,accessor array pos))
(reject-reason nil)
(reject-position pos)
(remaining-bytes (- end pos)))
(declare (type array-range reject-position remaining-bytes))
(labels ((valid-starter-byte-p (b)
(declare (type (unsigned-byte 8) b))
(let ((ok (,mb-len b)))
(unless ok
(setf reject-reason ',invalid-mb-starter-byte))
ok))
(enough-bytes-left-p (x)
(let ((ok (> end (+ pos (1- x)))))
(unless ok
(setf reject-reason 'end-of-input-in-character))
ok))
(valid-secondary-p (x)
(let* ((idx (the array-range (+ pos x)))
(b (,accessor array idx))
(ok (,mb-continuation-byte-p b)))
(unless ok
(setf reject-reason ',invalid-mb-continuation-byte)
(setf reject-position idx))
ok))
(preliminary-ok-for-length (maybe-len len)
(and (eql maybe-len len)
;; Has to be done in this order so that
;; certain broken sequences (e.g., the
;; two-byte sequence `"initial (length 3)"
;; "non-continuation"' -- `#xef #x32')
;; signal only part of that sequence as
;; erroneous.
(loop for i from 1 below (min len remaining-bytes)
always (valid-secondary-p i))
(enough-bytes-left-p len))))
(declare (inline valid-starter-byte-p
enough-bytes-left-p
valid-secondary-p
preliminary-ok-for-length))
(let ((maybe-len (valid-starter-byte-p initial-byte)))
(cond ((eql maybe-len 1)
(values 1 nil))
((preliminary-ok-for-length maybe-len 2)
(values 2 nil))
((preliminary-ok-for-length maybe-len 3)
(values 3 nil))
(t
(let* ((bad-end (ecase reject-reason
(,invalid-mb-starter-byte
(1+ pos))
(end-of-input-in-character
end)
(,invalid-mb-continuation-byte
reject-position))))
(declare (type array-range bad-end))
(let ((replacement (decoding-error array pos bad-end ,format replacement reject-reason reject-position)))
(values 1 replacement))))))))))))
(defun define-simple-get-mb-char-1 (accessor type format mb-to-ucs)
(let ((name (make-od-name-list 'simple-get format 'char accessor))
(malformed (make-od-name 'malformed format)))
`(progn
(declaim (inline ,name))
(defun ,name (array pos bytes replacement)
(declare (optimize speed #.*safety-0*)
(type ,type array)
(type array-range pos)
(type (integer 1 3) bytes))
(flet ((cref (x)
(,accessor array (the array-range (+ pos x)))))
(declare (inline cref))
(let ((code (,mb-to-ucs (ecase bytes
(1 (cref 0))
(2 (logior (ash (cref 0) 8) (cref 1)))
(3 (logior (ash (cref 0) 16)
(ash (cref 1) 8)
(cref 2)))))))
(if code
(code-char code)
(decoding-error array pos (+ pos bytes) ,format
replacement ',malformed pos))))))))
(defun define-mb->string-1 (accessor type format)
(let ((name
(make-od-name-list format '>string accessor))
(bytes-per-mb-character
(make-od-name-list 'bytes-per format 'character accessor))
(simple-get-mb-char
(make-od-name-list 'simple-get format 'char accessor)))
`(progn
(defun ,name (array astart aend replacement)
(declare (optimize speed #.*safety-0*)
(type ,type array)
(type array-range astart aend))
(let ((string (make-array 0 :adjustable t :fill-pointer 0 :element-type 'character)))
(loop with pos = astart
while (< pos aend)
do (multiple-value-bind (bytes invalid)
(,bytes-per-mb-character array pos aend replacement)
(declare (type (or null string) invalid))
(cond
((null invalid)
(let ((thing (,simple-get-mb-char array pos bytes replacement)))
(typecase thing
(character (vector-push-extend thing string))
(string
(dotimes (i (length thing))
(vector-push-extend (char thing i) string))))))
(t
(dotimes (i (length invalid))
(vector-push-extend (char invalid i) string))))
(incf pos bytes)))
(coerce string 'simple-string))))))
(declaim (inline mb-char-len))
(defun mb-char-len (code)
(declare (optimize speed #.*safety-0*)
(type fixnum code))
(cond ((< code 0) (unreachable))
((< code #x100) 1)
((< code #x10000) 2)
((< code #x1000000) 3)
(t (unreachable))))
)
(defmacro define-multibyte-encoding (format aliases
ucs-to-mb mb-to-ucs
mb-len mb-continuation-byte-p)
(let ((char->mb (make-od-name 'char-> format))
(string->mb (make-od-name 'string-> format))
(define-bytes-per-mb-character
(make-od-name-list 'define-bytes-per format 'character))
(define-simple-get-mb-char
(make-od-name-list 'define-simple-get format 'char))
(define-mb->string
(make-od-name-list 'define format '>string)))
`(progn
;; for octets.lisp
(define-condition ,(make-od-name 'malformed format)
(octet-decoding-error) ())
(define-condition ,(make-od-name-list 'invalid format 'starter-byte)
(octet-decoding-error) ())
(define-condition ,(make-od-name-list 'invalid format 'continuation-byte)
(octet-decoding-error) ())
(declaim (inline ,char->mb))
(defun ,char->mb (char dest string pos replacement)
(declare (optimize speed #.*safety-0*)
(type (array (unsigned-byte 8) (*)) dest))
(let ((code (,ucs-to-mb (char-code char))))
(if code
(flet ((add-byte (b)
(declare (type (unsigned-byte 8) b))
(vector-push-extend b dest)))
(declare (inline add-byte))
(setf code (the fixnum code))
(ecase (mb-char-len code)
(1
(add-byte code))
(2
(add-byte (ldb (byte 8 8) code))
(add-byte (ldb (byte 8 0) code)))
(3
(add-byte (ldb (byte 8 16) code))
(add-byte (ldb (byte 8 8) code))
(add-byte (ldb (byte 8 0) code)))))
(let ((octets (encoding-error ,format replacement string pos)))
(dotimes (i (length octets))
(vector-push-extend (aref octets i) dest))))))
(defun ,string->mb (string sstart send additional-space replacement)
(declare (optimize speed #.*safety-0*)
(type simple-string string)
(type array-range sstart send additional-space))
(let ((array (make-array (+ additional-space (- send sstart))
:element-type '(unsigned-byte 8)
:adjustable t
:fill-pointer 0)))
(loop for i from sstart below send
do (,char->mb (char string i) array string i replacement))
(dotimes (i additional-space)
(vector-push-extend 0 array))
(coerce array '(simple-array (unsigned-byte 8) (*)))))
(defmacro ,define-bytes-per-mb-character (accessor type)
(define-bytes-per-mb-character-1 accessor type ',format
',mb-len ',mb-continuation-byte-p))
(instantiate-octets-definition ,define-bytes-per-mb-character)
(defmacro ,define-simple-get-mb-char (accessor type)
(define-simple-get-mb-char-1 accessor type ',format ',mb-to-ucs))
(instantiate-octets-definition ,define-simple-get-mb-char)
(defmacro ,define-mb->string (accessor type)
(define-mb->string-1 accessor type ',format))
(instantiate-octets-definition ,define-mb->string)
;; for fd-stream.lisp
(define-external-format/variable-width ,aliases t
;; KLUDGE: it so happens that at present (2009-10-22) none of
;; the external formats defined with
;; define-multibyte-encoding can encode the unicode
;; replacement character, so we hardcode the preferred
;; replacement here.
#\?
(block size
(mb-char-len (or (,ucs-to-mb (char-code |ch|))
(return-from size 0))))
(let ((mb (,ucs-to-mb bits)))
(if (null mb)
(external-format-encoding-error stream |ch|)
(ecase size
(1 (setf (sap-ref-8 sap tail) mb))
(2 (setf (sap-ref-8 sap tail) (ldb (byte 8 8) mb)
(sap-ref-8 sap (1+ tail)) (ldb (byte 8 0) mb)))
(3 (setf (sap-ref-8 sap tail) (ldb (byte 8 16) mb)
(sap-ref-8 sap (1+ tail)) (ldb (byte 8 8) mb)
(sap-ref-8 sap (+ 2 tail)) (ldb (byte 8 0) mb))))))
(1 (,mb-len byte))
(let* ((mb (ecase size
(1 byte)
(2 (let ((byte2 (sap-ref-8 sap (1+ head))))
(unless (,mb-continuation-byte-p byte2)
(return-from decode-break-reason 2))
(dpb byte (byte 8 8) byte2)))
(3 (let ((byte2 (sap-ref-8 sap (1+ head)))
(byte3 (sap-ref-8 sap (+ 2 head))))
(unless (,mb-continuation-byte-p byte2)
(return-from decode-break-reason 2))
(unless (,mb-continuation-byte-p byte3)
(return-from decode-break-reason 3))
(dpb byte (byte 8 16) (dpb byte2 (byte 8 8) byte3))))))
(ucs (,mb-to-ucs mb)))
(if (null ucs)
(return-from decode-break-reason 1)
(code-char ucs)))
,(make-od-name format '>string-aref)
,string->mb
:char-encodable-p (,ucs-to-mb (char-code |ch|))))))