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tar: Couple of optimizations.

db4
Doug Coleman 2014-11-01 23:11:35 -07:00
parent 21b4e31d60
commit cbe72a7605
1 changed files with 5 additions and 4 deletions
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9
extra/tar/tar.factor
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@ -3,7 +3,8 @@
USING: accessors byte-arrays combinators io io.backend
io.directories io.encodings.binary io.files io.files.links
io.pathnames io.streams.byte-array io.streams.string kernel
math math.parser namespaces sequences strings summary ;
math math.parser namespaces sequences strings summary
typed ;
IN: tar
CONSTANT: zero-checksum 256
@ -22,7 +23,7 @@ ERROR: checksum-error header ;
: trim-string ( seq -- newseq ) [ "\0 " member? ] trim ;
: read-c-string ( n -- str/f )
read [ zero? ] trim-tail [ f ] when-empty >string ;
read [ zero? ] trim-tail "" like ;
: read-tar-header ( -- obj )
\ tar-header new
@ -43,8 +44,8 @@ ERROR: checksum-error header ;
8 read trim-string oct> >>devminor
155 read-c-string >>prefix ;
: checksum-header ( seq -- n )
148 cut-slice 8 tail-slice [ sum ] bi@ + 256 + ;
TYPED: checksum-header ( seq: byte-array -- n )
148 cut-slice 8 tail-slice [ 0 [ + ] reduce ] bi@ + 256 + >fixnum ;
: read-data-blocks ( tar-header -- )
dup size>> 0 > [