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302 lines
12 KiB
Racket
302 lines
12 KiB
Racket
#lang sugar/debug racket/base
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(require sugar/debug)
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(require (for-syntax racket/base br/syntax))
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(require racket/match racket/function racket/port br/define sugar/list racket/list racket/bytes racket/string racket/dict)
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(provide (all-defined-out))
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(define (dict-ref* d . keys)
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(foldl (λ (key d) (dict-ref d key)) d keys))
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(define string/utf-8? #t)
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(define string/latin-1? 'string/latin-1?)
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(define string/ascii? 'string/ascii?)
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(define bitfield? (λ (x) (and (list? x) (andmap boolean? x))))
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(define (assoc? x) (and (list? x) (andmap pair? x)))
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(struct binary-problem (msg val) #:transparent)
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(define bitfield #f)
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(define (reset-bitfield!) (set! bitfield #f))
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(define (read-bits-exact count p)
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(unless (pair? bitfield)
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(set! bitfield (bytes->bitfield (read-bytes 1 p))))
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(define-values (bits rest) (split-at bitfield count))
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(set! bitfield rest)
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bits)
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(define (read-bytes-exact count p)
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(define bs (read-bytes count p))
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(unless (and (bytes? bs) (= (bytes-length bs) count))
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(raise (binary-problem (format "byte string length ~a" count) bs)))
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bs)
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(define (bytes->integer len x)
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(when (< (bytes-length x) len) (raise-argument-error 'bytes->integer "too short" x))
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(cond
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[(= len 1) (bytes-ref x 0)]
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[else (integer-bytes->integer x #f #f)]))
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(define (integer->bytes len x)
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(case len
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[(1) (bytes x)]
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[(2 4 8) (integer->integer-bytes x len #f #f)]
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[else (raise-argument-error 'integer->bytes "byte length 1 2 4 8" len)]))
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(require racket/format)
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(define (hex? x) (and (list? x) (andmap string? x)))
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(define (int->hex int) (~r int #:base 16 #:min-width 2 #:pad-string "0"))
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(define (hex->int hex) (string->number hex 16))
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(define (bytes->ascii bs)
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(list->string (for/list ([b (in-bytes bs)])
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(if (< b 128)
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(integer->char b)
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(raise (binary-problem "ascii byte < 128" b))))))
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(define (ascii->bytes str)
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(apply bytes (for/list ([c (in-string str)])
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(char->integer c))))
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(define (bytes->bitfield bs)
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(for*/list ([b (in-bytes bs)]
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[idx (in-range 8)])
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(bitwise-bit-set? b idx)))
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(define (bitfield->bytes bf)
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(unless (zero? (modulo (length bf) 8))
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(raise-argument-error 'bitfield->bytes "bitfield length a multiple of 8" (length bf)))
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(apply bytes
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(let loop ([bf bf][acc null])
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(if (null? bf)
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(reverse acc)
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(let-values ([(bits rest) (split-at bf 8)])
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(loop rest (cons (bitfield->integer bits) acc)))))))
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(module+ test
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(check-equal? (bitfield->bytes (bytes->bitfield #"AB")) #"AB"))
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(define (bitfield->integer bits)
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(for/sum ([b (in-list bits)]
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[pow (in-range 8)]
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#:when b)
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(expt 2 pow)))
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(define (integer->bitfield len int)
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(define digits (reverse (string->list (number->string int 2))))
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(append (map (curry char=? #\1) digits) (make-list (- len (length digits)) #f)))
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(define bit? boolean?)
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(define-macro-cases case-proc
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[(N PROC [TEST-PROC . EXPRS] ... [else . ELSE-EXPRS])
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#'(cond [(equal? PROC TEST-PROC) . EXPRS] ... [else . ELSE-EXPRS])]
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[(N ARG ...) #'(N ARG ... [else (void)])])
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(define (:bits count #:type [type list?])
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(procedure-rename
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(λ (x)
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(define-values (input-proc output-proc)
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(case-proc type
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[integer? (values bitfield->integer (curry integer->bitfield count))]
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[bitfield? (values bytes->bitfield bitfield->bytes)]
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[boolean?
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(unless (= 1 count)
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(raise-argument-error ':bits "boolean type only supported for 1-bit" count))
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(values (λ (bitfield) (car bitfield)) (λ (boolean) (list boolean)))]
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[list? (values identity identity)]
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[else (raise-argument-error ':bits "not a supported type" type)]))
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(if (input-port? x)
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(input-proc (read-bits-exact count x))
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(let ([result (output-proc x)])
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(unless (and (andmap bit? result) (= (length result) count))
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(raise (binary-problem (format "bit string length ~a" count) result)))
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result))) (gensym 'bits-)))
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(define (bytes->hexline bs)
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(string-join
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(for/list ([b (in-bytes bs)])
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(~r b #:base 16 #:min-width 2 #:pad-string "0")) " "))
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(define (hexline->bytes hexline)
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(apply bytes (map (λ (str) (string->number str 16)) (string-split hexline))))
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(module+ test
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(check-equal? (bytes->hexline #"ABC") "41 42 43")
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(check-equal? (hexline->bytes "41 42 43") #"ABC"))
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(define (:bytes count #:type [type bytes?])
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(procedure-rename
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(λ (x)
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(define-values (input-proc output-proc)
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(case-proc type
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[integer? (values (curry bytes->integer count)
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(curry integer->bytes count))]
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[string/ascii? (values bytes->ascii ascii->bytes)]
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[string/utf-8? (values bytes->string/utf-8 string->bytes/utf-8)]
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[string/latin-1? (values bytes->string/latin-1 string->bytes/latin-1)]
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[bitfield? (values bytes->bitfield bitfield->bytes)]
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[bytes? (values identity identity)]
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[hex? (values bytes->hexline hexline->bytes)]
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[else (raise-argument-error ':bytes "not a supported type" type)]))
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(if (input-port? x)
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(input-proc (read-bytes-exact count x))
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(let ([result (output-proc x)])
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(unless (and (bytes? result) (= (bytes-length result) count))
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(raise (binary-problem (format "byte string length ~a" count) result)))
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result))) (gensym 'bytes-)))
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(define (list->hash-with-keys keys vals)
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(make-hash (list->dict-with-keys keys vals)))
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(define (hash->list-with-keys keys h)
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(for/list ([k (in-list keys)])
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(hash-ref h k)))
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(define (list->dict-with-keys keys vals)
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(map cons keys vals))
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(define (procedure-name proc)
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(string->symbol (cadr (regexp-match #rx"^#<procedure:(.*?)>$" (with-output-to-string (λ () (display proc)))))))
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(define (hash-has-keys? h keys)
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(define (sortation xs) (sort xs #:key symbol->string string<?))
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(equal? (sortation (hash-keys h)) (sortation keys)))
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(define (resolve-duplicates xs)
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(if (members-unique? xs)
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xs
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(for/list ([x (in-list xs)]
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[idx (in-naturals)])
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(string->symbol (format "~a-~a" x idx)))))
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(define-for-syntax (process-rule-proc-args args)
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(pattern-case-filter args
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[(NAME RULE-PROC) #'(let () (define-rule NAME RULE-PROC) NAME)]
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[ELSE #'ELSE]))
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(define-macro (define-seq-style-rule ID ID-INNER)
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#'(define-macro (ID . ARGS)
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#`(ID-INNER #,@(process-rule-proc-args #'ARGS))))
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(define-seq-style-rule :bitfield bitfield-inner)
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(define (bitfield-inner #:type [type list?] . rule-procs)
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((make-inner-proc (λ (xs) (let ([bf (append* xs)])
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(unless (zero? (modulo (length bf) 8))
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(raise-result-error ':bitfield (format "total field length is multiple of 8, got length ~a" (length bf)) bf))
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(bitfield->bytes bf))) 'bitfield) type rule-procs))
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(define-seq-style-rule :seq seq-inner)
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(define (seq-inner #:type [type list?] . rule-procs)
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((make-inner-proc bytes-append* ':seq) type rule-procs))
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(define-macro (:repeat COUNT-EXPR . ARGS)
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#`(repeat-inner COUNT-EXPR #,@(process-rule-proc-args #'ARGS)))
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(define (repeat-inner #:type [type list?] count . rule-procs)
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((make-inner-proc bytes-append* ':repeat) type (append* (make-list count rule-procs))))
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(define (make-inner-proc post-proc sym)
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(λ (type rule-procs)
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(procedure-rename
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(λ (x) (define-values (input-proc output-proc output-check)
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(case-proc type
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[hash?
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(define rule-proc-names (resolve-duplicates (map procedure-name rule-procs)))
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(values (curry list->hash-with-keys rule-proc-names)
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(curry hash->list-with-keys rule-proc-names)
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(λ (x)
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(unless (and (hash? x) (hash-has-keys? x rule-proc-names))
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(raise (binary-problem (format "hash with ~a keys, namely ~a" (length rule-procs) rule-proc-names) x)))))]
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[list? (values identity identity
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(λ (x)
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(unless (and (list? x) (= (length rule-procs) (length x)))
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(raise (binary-problem (format "list of ~a values" (length rule-procs)) x)))))]
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[vector? (values list->vector vector->list
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(λ (x)
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(unless (and (vector? x) (= (length rule-procs) (vector-length x)))
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(raise (binary-problem (format "list of ~a values" (length rule-procs)) x)))))]
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[assoc?
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(define rule-proc-names (resolve-duplicates (map procedure-name rule-procs)))
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(values (curry list->dict-with-keys rule-proc-names) (λ (d) (map cdr d))
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(λ (x)
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(unless (and (assoc? x) (= (length rule-procs) (length x)))
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(raise (binary-problem (format "list of ~a values" (length rule-procs)) x)))))]
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[else (raise-argument-error sym "not a supported type" type)]))
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(match x
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[(? input-port? p) (input-proc (map (λ (rule-proc) (rule-proc p)) rule-procs))]
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[else
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(output-check x)
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(post-proc (map (λ (rp xi) (rp xi)) rule-procs (output-proc x)))])) (gensym sym))))
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(define-macro (define-rule ID RULE-PROC)
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#'(define (ID [x (current-input-port)])
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(with-handlers ([binary-problem? (λ (exn)
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(raise-result-error
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'ID
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(binary-problem-msg exn)
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(binary-problem-val exn)))])
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(RULE-PROC x))))
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(define-macro (define-rules [ID RULE-PROC] ...)
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#'(begin (define-rule ID RULE-PROC) ...))
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(define-macro (let-rule ([ID RULE-PROC] ...) . BODY)
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#'(let () (define ID RULE-PROC) ... . BODY))
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(module+ test
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(require rackunit)
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(define-rule foo (:seq bar zam #:type hash?))
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(define-rule bar (:bytes 1 #:type integer?))
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(define-rule zam (:bytes 2 #:type integer?))
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(check-equal? #"AB" (zam (zam (open-input-bytes #"AB"))) (zam 16961))
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(check-equal? #"123" (foo (foo (open-input-bytes #"123"))) (foo '#hash((bar . 49) (zam . 13106))))
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(define-rule foolist (:seq bar zam bar zam))
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(check-equal? #"123456" (foolist (foolist (open-input-bytes #"123456"))) (foolist '(49 13106 52 13877)))
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#|
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(define-rule bam (:bytes 1))
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(define-rule bams (:seq bam bam bam))
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(define-rule rebams (:seq (:bytes 1) (:bytes 1) (:bytes 1)))
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(check-equal? (bams (open-input-bytes #"ABC")) (rebams (open-input-bytes #"ABC")))
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|#
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(define-rule hashrule (:seq bar zam bar zam bar #:type hash?))
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(check-equal? #"1234567" (hashrule (hashrule (open-input-bytes #"1234567")))
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(hashrule '#hash((zam-3 . 13877) (bar-2 . 52) (zam-1 . 13106) (bar-0 . 49) (bar-4 . 55))))
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(define-rule flag8 (:bits 8))
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(check-equal? (flag8 (open-input-bytes #"A")) '(#t #f #f #f #f #f #t #f))
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(define-rule flag4 (:bits 4))
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(check-equal? (flag4 (open-input-bytes #"A")) '(#t #f #f #f))
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(reset-bitfield!)
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(define-rule bitint (:bits 8 #:type integer?))
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(check-equal? (bitint (open-input-bytes #"A")) 65)
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(check-equal? (bitint 65) '(#t #f #f #f #f #f #t #f))
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(reset-bitfield!)
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(define-rule thing (:bytes 1))
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(define-rule rpt (:repeat 3 thing)) ; repeat has to use other identifier names, not direct rule procs
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(check-equal? (rpt (rpt (open-input-bytes #"ABC"))) #"ABC")
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) |