\ @(#) make_all256.fth 97/12/10 1.1
\ Make a file with all possible 256 bytes in random order.
\
\ Author: Phil Burk
\ Copyright 1987 Phil Burk
\ All Rights Reserved.

ANEW TASK-MAKE_ALL256

variable RAND8-SEED
19 rand8-seed !
: RANDOM8 ( -- r8 , generate random bytes, repeat every 256 )
    RAND8-SEED @
    77 * 55 +
    $ FF and
    dup RAND8-SEED !
;

create rand8-pad 256 allot
: make.256.data
    256 0
    DO
        random8 rand8-pad i + c!
    LOOP
;

: SHUFFLE.DATA { num | ind1 ind2 -- }
    num 0
    DO
        256 choose -> ind1
        256 choose -> ind2
        ind1 rand8-pad + c@
        ind2 rand8-pad + c@
        ind1 rand8-pad + c!
        ind2 rand8-pad + c!
    LOOP
;

: WRITE.256.FILE   { | fid -- }
    p" all256.raw" count r/w create-file
    IF
        drop ." Could not create file." cr
    ELSE
        -> fid
        fid . cr
        rand8-pad 256 fid write-file abort" write failed!"
        fid close-file drop
    THEN
;

: MAKE.256.FILE
    make.256.data
    1000 shuffle.data
    write.256.file
;

MAKE.256.FILE