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\ relocate 4stack binary
Create magic 8 allot
Variable image
Variable relinfo
Variable imagesize
: be@ 0 swap 4 bounds DO 8 lshift I c@ + LOOP ;
: scan-header ( fd -- skip ) >r 0
BEGIN
8 +
magic 8 r@ read-file throw 8 = WHILE
magic 8 s" Gforth14" compare 0= UNTIL
ELSE true abort" Magic not found!" THEN rdrop ;
Create bits $80 c, $40 c, $20 c, $10 c, $08 c, $04 c, $02 c, $01 c,
: bit@ ( n -- flag )
dup 3 rshift relinfo @ + c@ swap 7 and bits + c@ and 0<> ;
2Variable dovar
2Variable docol
: relocate ( -- ) hex
image @ $814 + be@ image @ $810 + be@ docol 2!
image @ $80C + be@ image @ $808 + be@ dovar 2!
imagesize @ 1 cells / 0 ?DO
image @ I cells + be@
\ dup 8 u.r I bit@ IF '+ ELSE '- THEN emit I 7 and 7 = IF cr THEN
dup 0< I bit@ and IF
CASE
-1 OF
0 image @ I cells + ! 1 ENDOF \ NIL
-2 OF
docol 2@
image @ I cells + 2! 2 ENDOF \ docol
-3 OF
dovar 2@ $10. d+
image @ I cells + 2! 2 ENDOF \ docon
-4 OF
dovar 2@
image @ I cells + 2! 2 ENDOF \ docon
-8 OF
image @ I 1+ cells + be@ 5 -
dovar 2@ nip
image @ I cells + 2! 2 ENDOF \ dodoes
-9 OF
docol 2@
image @ I cells + 2! 2 ENDOF \ docol
1 swap
ENDCASE
ELSE
image @ I cells + ! 1
THEN
+LOOP
image @ imagesize @ bounds ?DO
I 2@ swap I 2!
2 cells +LOOP ;
: read-gforth ( addr u -- ) r/o bin open-file throw
>r r@ file-size throw drop
r@ scan-header - dup allocate throw image !
image @ swap r@ read-file throw drop
image @ dup $804 ( 8 ) + be@ dup imagesize ! + relinfo !
r> close-file throw
relocate ;
Create 4magic $10 allot
s" 4stack00" 4magic swap move
: write-gforth ( addr u -- ) w/o bin open-file throw >r
imagesize @ 4magic $C + !
4magic $10 r@ write-file throw
image @ imagesize @ r@ write-file throw
r> close-file throw ;
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