-;;; utf-8.el --- Limited UTF-8 decoding/encoding support
+;;; utf-8.el --- limited UTF-8 decoding/encoding support
;; Copyright (C) 2001 Electrotechnical Laboratory, JAPAN.
;; Licensed to the Free Software Foundation.
+;; Copyright (C) 2001 Free Software Foundation, Inc.
+;; Author: TAKAHASHI Naoto <ntakahas@m17n.org>
;; Keywords: multilingual, Unicode, UTF-8, i18n
;; This file is part of GNU Emacs.
;; Thus magnification factor is two.
;;
`(2
- ((loop
+ ((r5 = ,(charset-id 'eight-bit-control))
+ (r6 = ,(charset-id 'eight-bit-graphic))
+ (loop
(read r0)
;; 1byte encoding, i.e., ascii
(if (r0 < #x80)
(write r0)
- ;; 2byte encoding
+ ;; 2 byte encoding 00000yyyyyxxxxxx = 110yyyyy 10xxxxxx
(if (r0 < #xe0)
((read r1)
- (r0 &= #x1f)
- (r0 <<= 6)
- (r1 &= #x3f)
- (r1 += r0)
- ;; now r1 holds scalar value
-
- ;; eight-bit-control
- (if (r1 < 160)
- ((r0 = ,(charset-id 'eight-bit-control))
- (write-multibyte-character r0 r1))
-
- ;; latin-iso8859-1
- (if (r1 < 256)
- ((r0 = ,(charset-id 'latin-iso8859-1))
- (r1 -= 128)
- (write-multibyte-character r0 r1))
-
- ;; mule-unicode-0100-24ff (< 0800)
- ((r0 = ,(charset-id 'mule-unicode-0100-24ff))
- (r1 -= #x0100)
- (r2 = (((r1 / 96) + 32) << 7))
- (r1 %= 96)
- (r1 += (r2 + 32))
- (write-multibyte-character r0 r1)))))
+
+ (if ((r1 & #b11000000) != #b10000000)
+ ;; Invalid 2-byte sequence
+ ((if (r0 < #xa0)
+ (write-multibyte-character r5 r0)
+ (write-multibyte-character r6 r0))
+ (if (r1 < #x80)
+ (write r1)
+ (if (r1 < #xa0)
+ (write-multibyte-character r5 r1)
+ (write-multibyte-character r6 r1))))
+
+ ((r0 &= #x1f)
+ (r0 <<= 6)
+ (r1 &= #x3f)
+ (r1 += r0)
+ ;; Now r1 holds scalar value
+
+ ;; eight-bit-control
+ (if (r1 < 160)
+ ((write-multibyte-character r5 r1))
+
+ ;; latin-iso8859-1
+ (if (r1 < 256)
+ ((r0 = ,(charset-id 'latin-iso8859-1))
+ (r1 -= 128)
+ (write-multibyte-character r0 r1))
+
+ ;; mule-unicode-0100-24ff (< 0800)
+ ((r0 = ,(charset-id 'mule-unicode-0100-24ff))
+ (r1 -= #x0100)
+ (r2 = (((r1 / 96) + 32) << 7))
+ (r1 %= 96)
+ (r1 += (r2 + 32))
+ (write-multibyte-character r0 r1)))))))
;; 3byte encoding
+ ;; zzzzyyyyyyxxxxxx = 1110zzzz 10yyyyyy 10xxxxxx
(if (r0 < #xf0)
((read r1 r2)
- (r3 = ((r0 & #x0f) << 12))
- (r3 += ((r1 & #x3f) << 6))
- (r3 += (r2 & #x3f))
- ;; now r3 holds scalar value
-
- ;; mule-unicode-0100-24ff (>= 0800)
- (if (r3 < #x2500)
- ((r0 = ,(charset-id 'mule-unicode-0100-24ff))
- (r3 -= #x0100)
- (r3 //= 96)
- (r1 = (r7 + 32))
- (r1 += ((r3 + 32) << 7))
- (write-multibyte-character r0 r1))
-
- ;; mule-unicode-2500-33ff
- (if (r3 < #x3400)
- ((r0 = ,(charset-id 'mule-unicode-2500-33ff))
- (r3 -= #x2500)
- (r3 //= 96)
- (r1 = (r7 + 32))
- (r1 += ((r3 + 32) << 7))
- (write-multibyte-character r0 r1))
-
- ;; U+3400 .. U+DFFF
- ;; keep those bytes as eight-bit-{control|graphic}
- (if (r3 < #xe000)
- (;; #xe0 < r0 < #xf0, so r0 is eight-bit-graphic
- (r3 = ,(charset-id 'eight-bit-graphic))
- (write-multibyte-character r3 r0)
- (if (r1 < #xa0)
- (r3 = ,(charset-id 'eight-bit-control)))
- (write-multibyte-character r3 r1)
- (if (r2 < #xa0)
- (r3 = ,(charset-id 'eight-bit-control))
- (r3 = ,(charset-id 'eight-bit-graphic)))
- (write-multibyte-character r3 r2))
-
- ;; mule-unicode-e000-ffff
- ((r0 = ,(charset-id 'mule-unicode-e000-ffff))
- (r3 -= #xe000)
- (r3 //= 96)
- (r1 = (r7 + 32))
- (r1 += ((r3 + 32) << 7))
- (write-multibyte-character r0 r1))))))
+
+ ;; This is set to 1 if the encoding is invalid.
+ (r4 = 0)
+
+ (r3 = (r1 & #b11000000))
+ (r3 |= ((r2 >> 2) & #b00110000))
+ (if (r3 != #b10100000)
+ (r4 = 1)
+ ((r3 = ((r0 & #x0f) << 12))
+ (r3 += ((r1 & #x3f) << 6))
+ (r3 += (r2 & #x3f))
+ (if (r3 < #x0800)
+ (r4 = 1))))
+
+ (if (r4 != 0)
+ ;; Invalid 3-byte sequence
+ ((if (r0 < #xa0)
+ (write-multibyte-character r5 r0)
+ (write-multibyte-character r6 r0))
+ (if (r1 < #x80)
+ (write r1)
+ (if (r1 < #xa0)
+ (write-multibyte-character r5 r1)
+ (write-multibyte-character r6 r1)))
+ (if (r2 < #x80)
+ (write r2)
+ (if (r2 < #xa0)
+ (write-multibyte-character r5 r2)
+ (write-multibyte-character r6 r2))))
+
+ ;; mule-unicode-0100-24ff (>= 0800)
+ ((if (r3 < #x2500)
+ ((r0 = ,(charset-id 'mule-unicode-0100-24ff))
+ (r3 -= #x0100)
+ (r3 //= 96)
+ (r1 = (r7 + 32))
+ (r1 += ((r3 + 32) << 7))
+ (write-multibyte-character r0 r1))
+
+ ;; mule-unicode-2500-33ff
+ (if (r3 < #x3400)
+ ((r0 = ,(charset-id 'mule-unicode-2500-33ff))
+ (r3 -= #x2500)
+ (r3 //= 96)
+ (r1 = (r7 + 32))
+ (r1 += ((r3 + 32) << 7))
+ (write-multibyte-character r0 r1))
+
+ ;; U+3400 .. U+DFFF
+ ;; keep those bytes as eight-bit-{control|graphic}
+ (if (r3 < #xe000)
+ ( ;; #xe0 <= r0 < #xf0, so r0 is eight-bit-graphic
+ (r3 = r6)
+ (write-multibyte-character r3 r0)
+ (if (r1 < #xa0)
+ (r3 = r5))
+ (write-multibyte-character r3 r1)
+ (if (r2 < #xa0)
+ (r3 = r5)
+ (r3 = r6))
+ (write-multibyte-character r3 r2))
+
+ ;; mule-unicode-e000-ffff
+ ((r0 = ,(charset-id 'mule-unicode-e000-ffff))
+ (r3 -= #xe000)
+ (r3 //= 96)
+ (r1 = (r7 + 32))
+ (r1 += ((r3 + 32) << 7))
+ (write-multibyte-character r0 r1))))))))
;; 4byte encoding
;; keep those bytes as eight-bit-{control|graphic}
((read r1 r2 r3)
;; r0 > #xf0, thus eight-bit-graphic
- (r4 = ,(charset-id 'eight-bit-graphic))
- (write-multibyte-character r4 r0)
+ (write-multibyte-character r6 r0)
(if (r1 < #xa0)
- (r4 = ,(charset-id 'eight-bit-control)))
- (write-multibyte-character r4 r1)
+ (write-multibyte-character r5 r1)
+ (write-multibyte-character r6 r1))
(if (r2 < #xa0)
- (r4 = ,(charset-id 'eight-bit-control))
- (r4 = ,(charset-id 'eight-bit-graphic)))
- (write-multibyte-character r4 r2)
+ (write-multibyte-character r5 r2)
+ (write-multibyte-character r6 r2))
(if (r3 < #xa0)
- (r4 = ,(charset-id 'eight-bit-control))
- (r4 = ,(charset-id 'eight-bit-graphic)))
- (write-multibyte-character r4 r3)))))
+ (write-multibyte-character r5 r3)
+ (write-multibyte-character r6 r3))))))
(repeat))))
"CCL program to decode UTF-8.
-Decoding is done into the charsets ascii, eight-bit-control,
-latin-iso8859-1 and mule-unicode-* only.")
+Basic decoding is done into the charsets ascii, latin-iso8859-1 and
+mule-unicode-*. Encodings of un-representable Unicode characters are
+decoded asis into eight-bit-control and eight-bit-graphic
+characters.")
(define-ccl-program ccl-encode-mule-utf-8
`(1
- (loop
- (read-multibyte-character r0 r1)
-
- (if (r0 == ,(charset-id 'ascii))
- (write r1)
-
- (if (r0 == ,(charset-id 'latin-iso8859-1))
- ;; r1 scalar utf-8
- ;; 0000 0yyy yyxx xxxx 110y yyyy 10xx xxxx
- ;; 20 0000 0000 1010 0000 1100 0010 1010 0000
- ;; 7f 0000 0000 1111 1111 1100 0011 1011 1111
- ((r0 = (((r1 & #x40) >> 6) | #xc2))
- (r1 &= #x3f)
- (r1 |= #x80)
- (write r0 r1))
-
- (if (r0 == ,(charset-id 'mule-unicode-0100-24ff))
- ((r0 = ((((r1 & #x3f80) >> 7) - 32) * 96))
- ;; #x3f80 == (0011 1111 1000 0000)b
- (r1 &= #x7f)
- (r1 += (r0 + 224)) ; 240 == -32 + #x0100
- ;; now r1 holds scalar value
- (if (r1 < #x0800)
- ;; 2byte encoding
- ((r0 = (((r1 & #x07c0) >> 6) | #xc0))
- ;; #x07c0 == (0000 0111 1100 0000)b
- (r1 &= #x3f)
- (r1 |= #x80)
- (write r0 r1))
- ;; 3byte encoding
- ((r0 = (((r1 & #xf000) >> 12) | #xe0))
- (r2 = ((r1 & #x3f) | #x80))
- (r1 &= #x0fc0)
- (r1 >>= 6)
- (r1 |= #x80)
- (write r0 r1 r2))))
-
- (if (r0 == ,(charset-id 'mule-unicode-2500-33ff))
- ((r0 = ((((r1 & #x3f80) >> 7) - 32) * 96))
- (r1 &= #x7f)
- (r1 += (r0 + 9440)) ; 9440 == -32 + #x2500
- (r0 = (((r1 & #xf000) >> 12) | #xe0))
- (r2 = ((r1 & #x3f) | #x80))
- (r1 &= #x0fc0)
- (r1 >>= 6)
- (r1 |= #x80)
- (write r0 r1 r2))
-
- (if (r0 == ,(charset-id 'mule-unicode-e000-ffff))
- ((r0 = ((((r1 & #x3f80) >> 7) - 32) * 96))
- (r1 &= #x7f)
- (r1 += (r0 + 57312)) ; 57312 == -160 + #xe000
- (r0 = (((r1 & #xf000) >> 12) | #xe0))
+ ((r5 = -1)
+ (loop
+ (if (r5 < 0)
+ ((r1 = -1)
+ (read-multibyte-character r0 r1))
+ (;; We have already done read-multibyte-character.
+ (r0 = r5)
+ (r1 = r6)
+ (r5 = -1)))
+
+ (if (r0 == ,(charset-id 'ascii))
+ (write r1)
+
+ (if (r0 == ,(charset-id 'latin-iso8859-1))
+ ;; r1 scalar utf-8
+ ;; 0000 0yyy yyxx xxxx 110y yyyy 10xx xxxx
+ ;; 20 0000 0000 1010 0000 1100 0010 1010 0000
+ ;; 7f 0000 0000 1111 1111 1100 0011 1011 1111
+ ((r0 = (((r1 & #x40) >> 6) | #xc2))
+ (r1 &= #x3f)
+ (r1 |= #x80)
+ (write r0 r1))
+
+ (if (r0 == ,(charset-id 'mule-unicode-0100-24ff))
+ ((r0 = ((((r1 & #x3f80) >> 7) - 32) * 96))
+ ;; #x3f80 == (0011 1111 1000 0000)b
+ (r1 &= #x7f)
+ (r1 += (r0 + 224)) ; 240 == -32 + #x0100
+ ;; now r1 holds scalar value
+ (if (r1 < #x0800)
+ ;; 2byte encoding
+ ((r0 = (((r1 & #x07c0) >> 6) | #xc0))
+ ;; #x07c0 == (0000 0111 1100 0000)b
+ (r1 &= #x3f)
+ (r1 |= #x80)
+ (write r0 r1))
+ ;; 3byte encoding
+ ((r0 = (((r1 & #xf000) >> 12) | #xe0))
(r2 = ((r1 & #x3f) | #x80))
(r1 &= #x0fc0)
(r1 >>= 6)
(r1 |= #x80)
- (write r0 r1 r2))
-
- (if (r0 == ,(charset-id 'eight-bit-control))
- ;; r1 scalar utf-8
- ;; 0000 0yyy yyxx xxxx 110y yyyy 10xx xxxx
- ;; 80 0000 0000 1000 0000 1100 0010 1000 0000
- ;; 9f 0000 0000 1001 1111 1100 0010 1001 1111
- (write r1)
-
- (if (r0 == ,(charset-id 'eight-bit-graphic))
- ;; r1 scalar utf-8
- ;; 0000 0yyy yyxx xxxx 110y yyyy 10xx xxxx
- ;; a0 0000 0000 1010 0000 1100 0010 1010 0000
- ;; ff 0000 0000 1111 1111 1101 1111 1011 1111
- (write r1)
-
- ;; Unsupported character.
- ;; Output U+FFFD, which is `ef bf bd' in UTF-8.
- ((write #xef)
- (write #xbf)
- (write #xbd)))))))))
- (repeat)))
+ (write r0 r1 r2))))
+
+ (if (r0 == ,(charset-id 'mule-unicode-2500-33ff))
+ ((r0 = ((((r1 & #x3f80) >> 7) - 32) * 96))
+ (r1 &= #x7f)
+ (r1 += (r0 + 9440)) ; 9440 == -32 + #x2500
+ (r0 = (((r1 & #xf000) >> 12) | #xe0))
+ (r2 = ((r1 & #x3f) | #x80))
+ (r1 &= #x0fc0)
+ (r1 >>= 6)
+ (r1 |= #x80)
+ (write r0 r1 r2))
+
+ (if (r0 == ,(charset-id 'mule-unicode-e000-ffff))
+ ((r0 = ((((r1 & #x3f80) >> 7) - 32) * 96))
+ (r1 &= #x7f)
+ (r1 += (r0 + 57312)) ; 57312 == -160 + #xe000
+ (r0 = (((r1 & #xf000) >> 12) | #xe0))
+ (r2 = ((r1 & #x3f) | #x80))
+ (r1 &= #x0fc0)
+ (r1 >>= 6)
+ (r1 |= #x80)
+ (write r0 r1 r2))
+
+ (if (r0 == ,(charset-id 'eight-bit-control))
+ ;; r1 scalar utf-8
+ ;; 0000 0yyy yyxx xxxx 110y yyyy 10xx xxxx
+ ;; 80 0000 0000 1000 0000 1100 0010 1000 0000
+ ;; 9f 0000 0000 1001 1111 1100 0010 1001 1111
+ ((write #xc2)
+ (write r1))
+
+ (if (r0 == ,(charset-id 'eight-bit-graphic))
+ ;; r1 scalar utf-8
+ ;; 0000 0yyy yyxx xxxx 110y yyyy 10xx xxxx
+ ;; a0 0000 0000 1010 0000 1100 0010 1010 0000
+ ;; ff 0000 0000 1111 1111 1101 1111 1011 1111
+ ((write r1)
+ (r1 = -1)
+ (read-multibyte-character r0 r1)
+ (if (r0 != ,(charset-id 'eight-bit-graphic))
+ (if (r0 != ,(charset-id 'eight-bit-control))
+ ((r5 = r0)
+ (r6 = r1))))
+ (if (r5 < 0)
+ ((read-multibyte-character r0 r2)
+ (if (r0 != ,(charset-id 'eight-bit-graphic))
+ (if (r0 != ,(charset-id 'eight-bit-control))
+ ((r5 = r0)
+ (r6 = r2))))
+ (if (r5 < 0)
+ (write r1 r2)
+ (if (r1 < #xa0)
+ (write r1)
+ ((write #xc2)
+ (write r1)))))))
+
+ ;; Unsupported character.
+ ;; Output U+FFFD, which is `ef bf bd' in UTF-8.
+ ((write #xef)
+ (write #xbf)
+ (write #xbd)))))))))
+ (repeat)))
+ (if (r1 >= #xa0)
+ (write r1)
+ (if (r1 >= #x80)
+ ((write #xc2)
+ (write r1)))))
"CCL program to encode into UTF-8.
Only characters from the charsets ascii, eight-bit-control,
-latin-iso8859-1 and mule-unicode-* are recognized. Others are encoded
-as U+FFFD.")
+eight-bit-graphic, latin-iso8859-1 and mule-unicode-* are recognized.
+Others are encoded as U+FFFD.")
(make-coding-system
'mule-utf-8 4 ?u
mule-unicode-0100-24ff
mule-unicode-2500-33ff
mule-unicode-e000-ffff)
- (mime-charset . utf-8)))
+ (mime-charset . utf-8)
+ (coding-category . coding-category-utf-8)
+ (valid-codes (0 . 255))))
(define-coding-system-alias 'utf-8 'mule-utf-8)
+
+;;; utf-8.el ends here