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file/zip: recognize string ports as seekable

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Matthew Flatt 2014-04-27 10:13:27 -06:00
parent 64bfb58dad
commit da600ad291
1 changed files with 5 additions and 4 deletions
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9
racket/collects/file/zip.rkt
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@ -72,10 +72,11 @@
;; seekable-port? : port -> boolean
(define (seekable-port? port)
(and (file-stream-port? port)
(with-handlers ([void (lambda (exn) #f)])
(file-position port (file-position port))
#t)))
(or (string-port? port)
(and (file-stream-port? port)
(with-handlers ([void (lambda (exn) #f)])
(file-position port (file-position port))
#t))))
(define (write-int n size)
(write-bytes (integer->integer-bytes n size #f #f)))