nxu/tar.tal

208 lines
5.7 KiB
Tal

( tal.tal )
( )
( by d_m )
( )
( currently only supports listing the contents of tar files )
( File1 is used to read the tar file )
( File2 is used to write files and directories )
|a0 @File1 [ &vec $2 &ok $2 &stat $2 &del $1 &append $1 &name $2 &len $2 &r $2 &w $2 ]
|b0 @File2 [ &vec $2 &ok $2 &stat $2 &del $1 &append $1 &name $2 &len $2 &r $2 &w $2 ]
|0100
;arg-callback ;on-stdin arg/init BRK
@exit ( code^ -> BRK )
#80 ORA #0f DEO BRK
@arg-callback ( -> )
;arg/count LDA
DUP #00 EQU ?&missing
DUP #01 GTH ?&toomany
POP !run
&missing ;missing-filename !&error
&toomany ;too-many-arguments
&error print ;usage print #01 !exit
@run ( -> )
#00 arg/read .File1/name DEO2 list #00 !exit
@on-stdin ( -> BRK ) BRK
@usage "usage: 20 "uxncli 20 "tar.rom 20 "FILENAME 0a 00
@missing-filename "error: 20 "missing 20 "filename 0a 00
@too-many-arguments "error: 20 "too 20 "many 20 "arguments 0a 00
@unsupported "unsupported 20 "format 20 00
@panic ( -> $exit )
#010e DEO #010f DEO BRK
@print ( s* -> )
&loop LDAk #00 EQU ,&eof JCN
LDAk #18 DEO INC2 ,&loop JMP
&eof POP2 JMP2r
@read-header ( -> ok^ )
( assume .File1/name was already written )
#0200 .File1/len DEO2
;header .File1/r DEO2
.File1/ok DEI2 #0200 EQU2 JMP2r
@list ( -> )
read-header ?&ok JMP2r &ok
;header/filename LDA ?&non-null
#800f DEO BRK
&non-null
;header/type LDA ( type^ )
DUP #00 EQU ?list-file ( )
DUP LIT "0 EQU ?list-file ( )
DUP LIT "5 EQU ?list-dir ( )
!list-unsupported ( )
@list-file ( 00^ -> )
POP
LIT "f #18 DEO #2018 DEO
;header/filename print #0a18 DEO
;header/size load-octal11
round-up-to-512 skip !list
@round-up-to-512 ( carry^ hi* lo* -> )
DUP2 #fe00 GTH2 ?&round-hi
#0200 OVR2 #01ff AND2 SUB2 ADD2 JMP2r
&round-hi
POP2 DUP2 #ffff EQU2 ?&round-carry INC2 #0000 JMP2r
&round-carry
POP2 DUP #ff EQU ?&overflow INC #0000 #0000 JMP2r
&overflow #0000 DIV
@list-dir ( 00^ -> )
POP
LIT "d #18 DEO #2018 DEO
;header/filename print #0a18 DEO
!list
@list-unsupported ( type^ -> )
;unsupported print emit/byte #0a18 DEO !panic
!list
@emit5 ( carry^ hi* lo* -> )
STH2 STH2 emit/byte STH2r STH2r !emit/long
@emit
&long SWP2 ,&short JSR
&short SWP ,&byte JSR
&byte DUP #04 SFT ,&char JSR
&char #0f AND DUP #09 GTH #27 MUL ADD #30 ADD #18 DEO
JMP2r
@read-error "error 20 "reading 20 "data 0a 00
( skips carry*2^32 + hi*2^16 + lo bytes )
@skip ( carry^ hi* lo* -> )
skip-lo ( carry^ hi* )
skip-hi ( carry^ )
?skip-4g JMP2r ( )
@skip-4g ( -> ) skip-2g ( fall-through )
@skip-2g ( -> ) #8000 !skip-hi
( skips hi*2^16 bytes )
@skip-hi ( hi* -> )
#0000 SWP2 SUB2 ( -hi* )
&loop ORAk ?&ok POP2 JMP2r ( )
&ok skip-64k INC2 !&loop ( -hi+1* )
@skip-64k ( -> ) skip-32k ( fall-through )
@skip-32k ( -> ) #8000 !skip-buf
@skip-lo ( lo* -> )
DUP2 #8000 GTH2 ?&double !skip-buf
&double #8000 SUB2 skip-buf !skip-32k
( skips lo bytes )
@skip-buf ( lo* -> )
ORAk ?&non-zero POP2 JMP2r &non-zero
DUP2 .File1/len DEO2
;buffer .File1/r DEO2
.File1/ok DEI2 EQU2 ?&ok
;read-error print !panic
&ok JMP2r
@is-size-32 ( -> bool^ )
;header/size LDA LIT "4 LTH JMP2r
@is-size-16 ( -> bool^ )
;header/size LDAk LIT "0 NEQ ?&fail
INC2 LDAk LIT "0 NEQ ?&fail
INC2 LDAk LIT "0 NEQ ?&fail
INC2 LDAk LIT "0 NEQ ?&fail
INC2 LDAk LIT "0 NEQ ?&fail
INC2 LDA LIT "2 LTH JMP2r
&fail POP2 #00 JMP2r
@octal-digit ( char^ -> oct^ )
LIT "0 DUP2 LTH ?&zero SUB JMP2r &zero POP2 #00 JMP2r
( returns values between #00:0000:0000 and #01:ffff:ffff )
@load-octal11 ( addr* -> carry^ hi* lo* )
INC2k load-octal10 ( addr* hi* lo* )
STH2 STH2 ( addr* [lo* hi*] )
LDA ( LIT "0 SUB ) octal-digit STH2r STH ( octal^ a^ [lo* b^] )
#20 SFT #02 SFT2 STHr STH2r ( carry^ hi* lo* )
JMP2r ( carry^ hi* lo* )
( returns values between #0000:0000 and #3fff:ffff )
@load-octal10 ( addr* -> hi* lo* )
#0005 OVR2 ADD2 ( addr* addr+5* )
load-octal5 STH2 ( addr* [cd*] )
load-octal5 SWPr STHr ( ab* c^ [d^] )
#10 SFT #01 SFT2 STH SWPr ( a^ b>>1^ [lo*] )
#10 SFT #01 SFT2 STH2r ( hi* lo* )
JMP2r ( hi* lo* )
( returns values between #0000 and #7fff )
@load-octal5 ( addr* -> num* )
#1000 LIT2r 0000 ( addr* place* [sum*] )
&loop ( pos* place* [sum*] )
OVR2 LDA octal-digit ( addr* place* digit^ [sum*] )
#00 SWP ( addr* place* digit* [sum*] )
OVR2 MUL2 STH2 ADD2r ( addr* place* [sum2=sum+place*digit*] )
SWP2 INC2 SWP2 ( addr+1* place* [sum2*] )
#03 SFT2 ORAk ?&loop ( addr+1* place>>3* [sum2*] )
POP2 POP2 STH2r JMP2r ( sum2* )
( header/size is 11 octal digits; 12th digit is NUL )
( octal 77777777777 = #01 #ffff #ffff )
( octal 37777777777 = #ffff #ffff )
( octal 00000177777 = #ffff )
( octal 00000000377 = #ff )
( octal 00000000000 = #00 )
( header/type -- only 0 and 5 are supported )
( '0' normal file; also could be NUL )
( '1' hard link )
( '2' symlink )
( '3' character device )
( '4' block device )
( '5' directory )
( '6' fifo )
( '7' contiguous file )
( header is always exactly 512 bytes )
@header
&filename $64
&mode $8 ( octal )
&owner $8 ( octal )
&group $8 ( octal )
&size $c ( octal )
&mtime $c ( octal )
&checksum $8
&type $1 ( item type )
&linkname $64
( load argument parser )
~arg.tal
( buffer for reading up to 32k bytes of data )
|8000 @buffer $8000