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add seeking to byte-array streams

db4
Doug Coleman 2009-03-06 17:34:21 -06:00
parent 68ad822cc5
commit 12a53bbdc0
1 changed files with 9 additions and 1 deletions
basis/io/streams/byte-array

10
basis/io/streams/byte-array/byte-array.factor
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@ -2,7 +2,7 @@
! See http://factorcode.org/license.txt for BSD license.
USING: byte-arrays byte-vectors kernel io.encodings io.streams.string
sequences io namespaces io.encodings.private accessors sequences.private
io.streams.sequence destructors ;
io.streams.sequence destructors math combinators ;
IN: io.streams.byte-array
: <byte-writer> ( encoding -- stream )
@ -20,6 +20,14 @@ M: byte-reader stream-read1 sequence-read1 ;
M: byte-reader stream-read-until sequence-read-until ;
M: byte-reader dispose drop ;
M: byte-reader stream-seek ( n seek-type stream -- )
swap {
{ seek-absolute [ (>>i) ] }
{ seek-relative [ [ + ] change-i drop ] }
{ seek-end [ dup underlying>> length >>i [ + ] change-i drop ] }
[ bad-seek-type ]
} case ;
: <byte-reader> ( byte-array encoding -- stream )
[ B{ } like 0 byte-reader boa ] dip <decoder> ;