2007-05-18 18:02:49 -04:00
|
|
|
|
|
|
|
(library (ikarus transcoders)
|
2007-10-12 00:33:19 -04:00
|
|
|
(export string->utf8 utf8->string)
|
|
|
|
(import (except (ikarus) string->utf8 utf8->string)
|
2007-05-18 18:02:49 -04:00
|
|
|
(ikarus system $strings)
|
|
|
|
(ikarus system $bytevectors)
|
|
|
|
(ikarus system $fx)
|
2007-05-18 20:18:55 -04:00
|
|
|
(ikarus system $chars))
|
2007-05-18 18:02:49 -04:00
|
|
|
;;; From http://en.wikipedia.org/wiki/UTF-8
|
|
|
|
;;; hexadecimal binary scalar value UTF8
|
|
|
|
;;; 000000-00007F 00000000_00000000_0zzzzzzz 0zzzzzzz
|
|
|
|
;;; 000080-0007FF 00000000_00000yyy_yyzzzzzz 110yyyyy 10zzzzzz
|
|
|
|
;;; 000800-00FFFF 00000000_xxxxyyyy_yyzzzzzz 1110xxxx 10yyyyyy 10zzzzzz
|
|
|
|
;;; 010000-10FFFF 000wwwxx_xxxxyyyy_yyzzzzzz 11110www 10xxxxxx 10yyyyyy 10zzzzzz
|
|
|
|
|
|
|
|
;;; valid ranges: [000000 - 00D7FF] \union [00E000 - 10FFFF]
|
|
|
|
;;; invalid hole: [00D800 - 00DFFF]
|
|
|
|
|
|
|
|
;;; handling-modes: ignore, replace, raise
|
|
|
|
;;; ignore: skips over the offending bytes
|
|
|
|
;;; replace: places a U+FFFD in place of the malformed bytes
|
|
|
|
;;; raise: raises an error
|
|
|
|
|
2007-10-12 00:33:19 -04:00
|
|
|
(define string->utf8
|
2007-05-18 18:02:49 -04:00
|
|
|
(lambda (str)
|
2007-05-18 20:18:55 -04:00
|
|
|
(define (utf8-string-size str)
|
|
|
|
(let f ([str str] [i 0] [j ($string-length str)] [n 0])
|
|
|
|
(cond
|
|
|
|
[($fx= i j) n]
|
|
|
|
[else
|
|
|
|
(let ([c ($string-ref str i)])
|
|
|
|
(let ([b ($char->fixnum c)])
|
|
|
|
(f str ($fxadd1 i) j
|
|
|
|
($fx+ n
|
|
|
|
(cond
|
|
|
|
[($fx<= b #x7F) 1]
|
|
|
|
[($fx<= b #x7FF) 2]
|
|
|
|
[($fx<= b #xFFFF) 3]
|
|
|
|
[else 4])))))])))
|
|
|
|
(define (fill-utf8-bytevector bv str)
|
|
|
|
(let f ([bv bv] [str str] [i 0] [j 0] [n ($string-length str)])
|
|
|
|
(cond
|
|
|
|
[($fx= i n) bv]
|
|
|
|
[else
|
|
|
|
(let ([c ($string-ref str i)])
|
|
|
|
(let ([b ($char->fixnum c)])
|
|
|
|
(cond
|
|
|
|
[($fx<= b #x7F)
|
|
|
|
($bytevector-set! bv j b)
|
|
|
|
(f bv str ($fxadd1 i) ($fxadd1 j) n)]
|
|
|
|
[($fx<= b #x7FF)
|
|
|
|
($bytevector-set! bv j
|
|
|
|
($fxlogor #b11000000 ($fxsra b 6)))
|
|
|
|
($bytevector-set! bv ($fx+ j 1)
|
|
|
|
($fxlogor #b10000000 ($fxlogand b #b111111)))
|
|
|
|
(f bv str ($fxadd1 i) ($fx+ j 2) n)]
|
|
|
|
[($fx<= b #xFFFF)
|
|
|
|
($bytevector-set! bv j
|
|
|
|
($fxlogor #b11100000 ($fxsra b 12)))
|
|
|
|
($bytevector-set! bv ($fx+ j 1)
|
|
|
|
($fxlogor #b10000000 ($fxlogand ($fxsra b 6) #b111111)))
|
|
|
|
($bytevector-set! bv ($fx+ j 2)
|
|
|
|
($fxlogor #b10000000 ($fxlogand b #b111111)))
|
|
|
|
(f bv str ($fxadd1 i) ($fx+ j 3) n)]
|
|
|
|
[else
|
|
|
|
($bytevector-set! bv j
|
|
|
|
($fxlogor #b11110000 ($fxsra b 18)))
|
|
|
|
($bytevector-set! bv ($fx+ j 1)
|
|
|
|
($fxlogor #b10000000 ($fxlogand ($fxsra b 12) #b111111)))
|
|
|
|
($bytevector-set! bv ($fx+ j 2)
|
|
|
|
($fxlogor #b10000000 ($fxlogand ($fxsra b 6) #b111111)))
|
|
|
|
($bytevector-set! bv ($fx+ j 3)
|
|
|
|
($fxlogor #b10000000 ($fxlogand b #b111111)))
|
|
|
|
(f bv str ($fxadd1 i) ($fx+ j 4) n)])))])))
|
2007-05-18 18:02:49 -04:00
|
|
|
(unless (string? str)
|
2007-10-12 00:33:19 -04:00
|
|
|
(error 'string->utf8 "~s is not a string" str))
|
2007-05-18 18:02:49 -04:00
|
|
|
(fill-utf8-bytevector
|
|
|
|
($make-bytevector (utf8-string-size str))
|
|
|
|
str)))
|
|
|
|
|
2007-10-12 00:33:19 -04:00
|
|
|
(define (utf8->string x) (decode-utf8-bytevector x 'replace))
|
|
|
|
|
|
|
|
(define decode-utf8-bytevector
|
2007-05-18 20:18:55 -04:00
|
|
|
(let ()
|
2007-10-12 00:33:19 -04:00
|
|
|
(define who 'decode-utf8-bytevector)
|
2007-05-18 20:18:55 -04:00
|
|
|
(define (count bv mode)
|
|
|
|
(let f ([x bv] [i 0] [j ($bytevector-length bv)] [n 0] [mode mode])
|
|
|
|
(cond
|
|
|
|
[($fx= i j) n]
|
|
|
|
[else
|
|
|
|
(let ([b0 ($bytevector-u8-ref x i)])
|
|
|
|
(cond
|
|
|
|
[($fx<= b0 #x7F)
|
|
|
|
(f x ($fxadd1 i) j ($fxadd1 n) mode)]
|
|
|
|
[($fx= ($fxsra b0 5) #b110)
|
|
|
|
(let ([i ($fxadd1 i)])
|
|
|
|
(cond
|
|
|
|
[($fx< i j)
|
|
|
|
(let ([b1 ($bytevector-u8-ref x i)])
|
|
|
|
(cond
|
|
|
|
[($fx= ($fxsra b1 6) #b10)
|
|
|
|
(f x ($fxadd1 i) j ($fxadd1 n) mode)]
|
|
|
|
[(eq? mode 'ignore)
|
|
|
|
(f x i j n mode)]
|
|
|
|
[(eq? mode 'replace)
|
|
|
|
(f x i j ($fxadd1 n) mode)]
|
|
|
|
[else
|
2007-06-10 00:32:19 -04:00
|
|
|
(error who "invalid byte sequence ~s ~s
|
|
|
|
in idx ~s of ~s" b0 b1 i bv)]))]
|
2007-05-18 20:18:55 -04:00
|
|
|
[(eq? mode 'ignore) n]
|
|
|
|
[(eq? mode 'replace) ($fxadd1 n)]
|
|
|
|
[else
|
|
|
|
(error who "invalid byte ~s near end of bytevector" b0)]))]
|
|
|
|
[($fx= ($fxsra b0 4) #b1110)
|
|
|
|
(cond
|
|
|
|
[($fx< ($fx+ i 2) j)
|
|
|
|
(let ([b1 ($bytevector-u8-ref x ($fx+ i 1))]
|
|
|
|
[b2 ($bytevector-u8-ref x ($fx+ i 2))])
|
|
|
|
(cond
|
|
|
|
[($fx= ($fxsra ($fxlogor b1 b2) 6) #b10)
|
|
|
|
(f x ($fx+ i 3) j ($fxadd1 n) mode)]
|
|
|
|
[(eq? mode 'ignore)
|
|
|
|
(f x ($fxadd1 i) j n mode)]
|
|
|
|
[(eq? mode 'replace)
|
|
|
|
(f x ($fxadd1 i) j ($fxadd1 n) mode)]
|
|
|
|
[else (error who "invalid sequence ~s ~s ~s" b0 b1 b2)]))]
|
|
|
|
[(eq? mode 'ignore) (f x ($fxadd1 i) j n mode)]
|
|
|
|
[(eq? mode 'replace) (f x ($fxadd1 i) j ($fxadd1 n) mode)]
|
|
|
|
[else (error who "incomplete char sequence")])]
|
|
|
|
[($fx= ($fxsra b0 3) #b11110)
|
|
|
|
(cond
|
|
|
|
[($fx< ($fx+ i 3) j)
|
|
|
|
(let ([b1 ($bytevector-u8-ref x ($fx+ i 1))]
|
|
|
|
[b2 ($bytevector-u8-ref x ($fx+ i 2))]
|
|
|
|
[b3 ($bytevector-u8-ref x ($fx+ i 3))])
|
|
|
|
(cond
|
|
|
|
[($fx= ($fxsra ($fxlogor b1 ($fxlogor b2 b3)) 6) #b10)
|
|
|
|
(f x ($fx+ i 4) j ($fxadd1 n) mode)]
|
|
|
|
[(eq? mode 'ignore)
|
|
|
|
(f x ($fxadd1 i) j n mode)]
|
|
|
|
[(eq? mode 'replace)
|
|
|
|
(f x ($fxadd1 i) j ($fxadd1 n) mode)]
|
|
|
|
[else (error who "invalid sequence ~s ~s ~s ~s" b0 b1 b2 b3)]))]
|
|
|
|
[(eq? mode 'ignore) (f x ($fxadd1 i) j n mode)]
|
|
|
|
[(eq? mode 'replace) (f x ($fxadd1 i) j ($fxadd1 n) mode)]
|
|
|
|
[else (error who "incomplete char sequence")])]
|
|
|
|
[(eq? mode 'ignore) (f x ($fxadd1 i) j n mode)]
|
|
|
|
[(eq? mode 'replace) (f x ($fxadd1 i) j ($fxadd1 n) mode)]
|
2007-06-01 22:17:22 -04:00
|
|
|
[else (error who "invalid byte ~s at index ~s of ~s"
|
|
|
|
b0 i x)]))])))
|
2007-05-18 20:18:55 -04:00
|
|
|
(define (fill str bv mode)
|
|
|
|
(let f ([str str] [x bv] [i 0] [j ($bytevector-length bv)] [n 0] [mode mode])
|
|
|
|
(cond
|
|
|
|
[($fx= i j) str]
|
|
|
|
[else
|
|
|
|
(let ([b0 ($bytevector-u8-ref x i)])
|
|
|
|
(cond
|
|
|
|
[($fx<= b0 #x7F)
|
|
|
|
($string-set! str n ($fixnum->char b0))
|
|
|
|
(f str x ($fxadd1 i) j ($fxadd1 n) mode)]
|
|
|
|
[($fx= ($fxsra b0 5) #b110)
|
|
|
|
(let ([i ($fxadd1 i)])
|
|
|
|
(cond
|
|
|
|
[($fx< i j)
|
|
|
|
(let ([b1 ($bytevector-u8-ref x i)])
|
|
|
|
(cond
|
|
|
|
[($fx= ($fxsra b1 6) #b10)
|
|
|
|
($string-set! str n
|
|
|
|
($fixnum->char
|
|
|
|
($fx+ ($fxlogand b1 #b111111)
|
|
|
|
($fxsll ($fxlogand b0 #b11111) 6))))
|
|
|
|
(f str x ($fxadd1 i) j ($fxadd1 n) mode)]
|
|
|
|
[(eq? mode 'ignore)
|
|
|
|
(f str x i j n mode)]
|
|
|
|
[(eq? mode 'replace)
|
|
|
|
($string-set! str n ($fixnum->char #xFFFD))
|
|
|
|
(f str x i j ($fxadd1 n) mode)]
|
|
|
|
[else (error who "BUG")]))]
|
|
|
|
[(eq? mode 'ignore) str]
|
|
|
|
[(eq? mode 'replace)
|
|
|
|
($string-set! str n ($fixnum->char #xFFFD))
|
|
|
|
str]
|
|
|
|
[else (error who "BUG")]))]
|
|
|
|
[($fx= ($fxsra b0 4) #b1110)
|
|
|
|
(cond
|
|
|
|
[($fx< ($fx+ i 2) j)
|
|
|
|
(let ([b1 ($bytevector-u8-ref x ($fx+ i 1))]
|
|
|
|
[b2 ($bytevector-u8-ref x ($fx+ i 2))])
|
|
|
|
(cond
|
|
|
|
[($fx= ($fxsra ($fxlogor b1 b2) 6) #b10)
|
|
|
|
($string-set! str n
|
|
|
|
($fixnum->char
|
|
|
|
($fx+ ($fxlogand b2 #b111111)
|
|
|
|
($fx+ ($fxsll ($fxlogand b1 #b111111) 6)
|
|
|
|
($fxsll ($fxlogand b0 #b1111) 12)))))
|
|
|
|
(f str x ($fx+ i 3) j ($fxadd1 n) mode)]
|
|
|
|
[(eq? mode 'ignore)
|
|
|
|
(f str x ($fxadd1 i) j n mode)]
|
|
|
|
[(eq? mode 'replace)
|
|
|
|
($string-set! str n ($fixnum->char #xFFFD))
|
|
|
|
(f str x ($fxadd1 i) j ($fxadd1 n) mode)]
|
|
|
|
[else (error who "BUG")]))]
|
|
|
|
[(eq? mode 'ignore) (f str x ($fxadd1 i) j n mode)]
|
|
|
|
[(eq? mode 'replace)
|
|
|
|
($string-set! str n ($fixnum->char #xFFFD))
|
|
|
|
(f str x ($fxadd1 i) j ($fxadd1 n) mode)]
|
2007-05-18 20:59:10 -04:00
|
|
|
[else (error who "BUG")])]
|
2007-05-18 20:18:55 -04:00
|
|
|
[($fx= ($fxsra b0 3) #b11110)
|
|
|
|
(cond
|
|
|
|
[($fx< ($fx+ i 3) j)
|
|
|
|
(let ([b1 ($bytevector-u8-ref x ($fx+ i 1))]
|
|
|
|
[b2 ($bytevector-u8-ref x ($fx+ i 2))]
|
|
|
|
[b3 ($bytevector-u8-ref x ($fx+ i 3))])
|
|
|
|
(cond
|
|
|
|
[($fx= ($fxsra ($fxlogor b1 ($fxlogor b2 b3)) 6) #b10)
|
|
|
|
($string-set! str n
|
|
|
|
($fixnum->char
|
|
|
|
($fx+ ($fxlogand b3 #b111111)
|
|
|
|
($fx+ ($fxsll ($fxlogand b2 #b111111) 6)
|
|
|
|
($fx+ ($fxsll ($fxlogand b1 #b111111) 12)
|
|
|
|
($fxsll ($fxlogand b0 #b111) 18))))))
|
|
|
|
(f str x ($fx+ i 4) j ($fxadd1 n) mode)]
|
|
|
|
[(eq? mode 'ignore)
|
|
|
|
(f str x ($fxadd1 i) j n mode)]
|
|
|
|
[(eq? mode 'replace)
|
|
|
|
($string-set! str n ($fixnum->char #xFFFD))
|
|
|
|
(f str x ($fxadd1 i) j ($fxadd1 n) mode)]
|
|
|
|
[else (error who "BUG")]))]
|
|
|
|
[(eq? mode 'ignore) (f str x ($fxadd1 i) j n mode)]
|
|
|
|
[(eq? mode 'replace)
|
|
|
|
($string-set! str n ($fixnum->char #xFFFD))
|
|
|
|
(f str x ($fxadd1 i) j ($fxadd1 n) mode)]
|
|
|
|
[else (error who "BUG")])]
|
|
|
|
[(eq? mode 'ignore) (f str x ($fxadd1 i) j n mode)]
|
|
|
|
[(eq? mode 'replace)
|
|
|
|
($string-set! str n ($fixnum->char #xFFFD))
|
|
|
|
(f str x ($fxadd1 i) j ($fxadd1 n) mode)]
|
|
|
|
[else (error who "BUG")]))])))
|
|
|
|
(define (convert bv mode)
|
|
|
|
(fill ($make-string (count bv mode)) bv mode))
|
|
|
|
(case-lambda
|
2007-05-18 20:59:10 -04:00
|
|
|
[(bv) (convert bv 'raise)]
|
2007-05-18 20:18:55 -04:00
|
|
|
[(bv handling-mode)
|
|
|
|
(unless (memq handling-mode '(ignore replace raise))
|
2007-10-12 00:33:19 -04:00
|
|
|
(error 'decode-utf8-bytevector
|
2007-05-18 20:18:55 -04:00
|
|
|
"~s is not a valid handling mode"
|
|
|
|
handling-mode))
|
|
|
|
(convert bv handling-mode)])))
|
2007-05-18 18:02:49 -04:00
|
|
|
|
|
|
|
)
|