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112 lines
4.4 KiB
Racket
112 lines
4.4 KiB
Racket
#lang racket/base
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(require rackunit
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racket/class
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"../helper.rkt"
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"../array.rkt"
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"../number.rkt"
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"../pointer.rkt"
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sugar/unstable/dict)
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#|
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approximates
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https://github.com/mbutterick/restructure/blob/master/test/Array.coffee
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|#
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(test-case
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"decode fixed length"
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(parameterize ([current-input-port (open-input-bytes (bytes 1 2 3 4 5))])
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(check-equal? (decode (+xarray #:type uint8 #:length 4)) '(1 2 3 4))))
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(test-case
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"decode with post-decode"
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(parameterize ([current-input-port (open-input-bytes (bytes 1 2 3 4 5))])
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(define myarray% (class xarray%
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(super-new)
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(define/override (post-decode val) (map (λ (x) (* 2 x)) val))))
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(define xa (+xarray #:type uint8 #:length 4 #:subclass myarray%))
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(check-equal? (decode xa) '(2 4 6 8))))
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(test-case
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"decode fixed number of bytes"
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(parameterize ([current-input-port (open-input-bytes (bytes 1 2 3 4 5))])
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(check-equal? (decode (+xarray #:type uint16be #:length 4 #:count-bytes #t)) '(258 772))))
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(test-case
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"decode length from parent key"
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(parameterize ([current-input-port (open-input-bytes (bytes 1 2 3 4 5))])
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(check-equal? (send (+xarray #:type uint8 #:length 'len) xxdecode (current-input-port) (mhash 'len 4)) '(1 2 3 4))))
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(test-case
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"decode byte count from parent key"
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(parameterize ([current-input-port (open-input-bytes (bytes 1 2 3 4 5))])
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(check-equal? (send (+xarray #:type uint16be #:length 'len #:count-bytes #t) xxdecode (current-input-port) (mhash 'len 4)) '(258 772))))
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(test-case
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"decode length as number before array"
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(parameterize ([current-input-port (open-input-bytes (bytes 4 1 2 3 4 5))])
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(check-equal? (decode (+xarray #:type uint8 #:length uint8)) '(1 2 3 4))))
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(test-case
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"decode byte count as number before array"
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(parameterize ([current-input-port (open-input-bytes (bytes 4 1 2 3 4 5))])
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(check-equal? (decode (+xarray #:type uint16be #:length uint8 #:count-bytes #t)) '(258 772))))
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(test-case
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"decode length from function"
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(parameterize ([current-input-port (open-input-bytes (bytes 1 2 3 4 5))])
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(check-equal? (decode (+xarray #:type uint8 #:length (λ _ 4))) '(1 2 3 4))))
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(test-case
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"decode byte count from function"
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(parameterize ([current-input-port (open-input-bytes (bytes 1 2 3 4 5))])
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(check-equal? (decode (+xarray #:type uint16be #:length (λ _ 4) #:count-bytes #t)) '(258 772))))
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(test-case
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"decode to the end of parent if no length given"
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(parameterize ([current-input-port (open-input-bytes (bytes 1 2 3 4 5))])
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(check-equal? (send (+xarray #:type uint8) xxdecode (current-input-port) (mhash '_length 4 '_startOffset 0)) '(1 2 3 4))))
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(test-case
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"decode to the end of the stream if parent exists, but its length is 0"
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(parameterize ([current-input-port (open-input-bytes (bytes 1 2 3 4 5))])
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(check-equal? (send (+xarray #:type uint8) xxdecode (current-input-port) (mhash '_length 0 '_startOffset 0)) '(1 2 3 4 5))))
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(test-case
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"decode to the end of the stream if no parent and length is given"
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(parameterize ([current-input-port (open-input-bytes (bytes 1 2 3 4))])
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(check-equal? (decode (+xarray #:type uint8)) '(1 2 3 4 ))))
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(test-case
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"use array length"
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(check-equal? (size (+xarray #:type uint8 #:length 10) '(1 2 3 4)) 4))
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(test-case
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"add size of length field before string"
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(check-equal? (size (+xarray #:type uint8 #:length uint8) '(1 2 3 4)) 5))
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(test-case
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"use defined length if no value given"
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(check-equal? (size (+xarray #:type uint8 #:length 10)) 10))
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(test-case
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"encode using array length"
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(check-equal? (encode (+xarray #:type uint8 #:length 10) '(1 2 3 4) #f) (bytes 1 2 3 4)))
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(test-case
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"encode with pre-encode"
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(parameterize ([current-input-port (open-input-bytes (bytes 1 2 3 4 5))])
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(define myarray% (class xarray%
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(super-new)
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(define/override (pre-encode val) (map (λ (x) (* 2 x)) val))))
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(define xa (+xarray #:type uint8 #:length 4 #:subclass myarray%))
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(check-equal? (encode xa '(1 2 3 4) #f) (bytes 2 4 6 8))))
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(test-case
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"encode length as number before array"
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(check-equal? (encode (+xarray #:type uint8 #:length uint8) '(1 2 3 4) #f) (bytes 4 1 2 3 4)))
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(test-case
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"add pointers after array if length is encoded at start"
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(check-equal? (encode (+xarray #:type (+xpointer #:offset-type uint8
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#:type uint8)
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#:length uint8) '(1 2 3 4) #f) (bytes 4 5 6 7 8 1 2 3 4))) |