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27 lines
1.0 KiB
Racket
27 lines
1.0 KiB
Racket
#lang racket/base
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(require xenomorph)
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(provide cvt_)
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#|
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approximates
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https://github.com/mbutterick/fontkit/blob/master/src/tables/cvt.js
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|#
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(define cvt_ (x:struct 'controlValues (x:array #:type int16be)))
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(module+ test
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(require rackunit racket/serialize "../helper.rkt")
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(define ip (open-input-file charter-path))
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(define dir (deserialize (read (open-input-file charter-directory-path))))
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(define offset (hash-ref (hash-ref (hash-ref dir 'tables) 'cvt_) 'offset))
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(define len (hash-ref (hash-ref (hash-ref dir 'tables) 'cvt_) 'length))
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(check-equal? offset 4592)
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(check-equal? len 26)
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(file-position ip 0)
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(define table-bytes #"\0\24\0+\0S\0\0\0\20\377&\0\0\1\341\0\v\2\237\0\22\2\340\0\b")
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(check-equal? table-bytes (peek-bytes len offset ip))
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(define ds (open-input-bytes (peek-bytes len offset ip)))
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(define cvt-array '(20 43 83 0 16 -218 0 481 11 671 18 736 8))
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(check-equal? (hash-ref (decode cvt_ ds) 'controlValues) cvt-array)
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(check-equal? (encode cvt_ (make-hash (list (cons 'controlValues cvt-array))) #f) table-bytes))
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