---------- Forwarded message ----------
From:
Marijn <hkBst@x>
Date: Fri, Jul 13, 2012 at 12:51 AM
Subject: [Scheme-reports] decoding strings from bytevectors
To:
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Hash: SHA1
Hi,
I recently ran into this minor issue writing some R6RS code and would
like to know how R7RS addresses it.
Say you want to extract a string from a bytevector, but the bytevector
contains other information before and after the bytes that encode the
string data. In R6RS, AFAIK, you have to copy those bytes to a new
bytevector and then decode that entire bytevector to a string
(probably causing another copy operation). I think it would be useful
if something like
(define (string-decoder bytevector position length transcoder
(bytevector->string
(let ((bv (make-bytevector length)))
(bytevector-copy!
bytevector position bv 0 length)
bv)
transcoder) )
were supported directly by bytevector->string without the additional
bytevector-copy.
Marijn
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