uxn-utils/cli/lz/ulzdec.tal

( ulz decoder )

|10 @Console &vector $2 &read $1 &pad $5 &write $1 &err $1
|a0 @File &vector $2 &success $2 &stat $2 &delete $1 &append $1 &name $2 &length $2 &read $2 &write $2
|00 @src $30 @dst $30 @ptr $1

|0100

@ready-src ( -> ) ;&await .Console/vector DEO2 BRK
	&await ( -> ) .Console/read DEI .src skey ?ready-dst BRK
@ready-dst ( -> ) ;&await .Console/vector DEO2 BRK
	&await ( -> ) .Console/read DEI .dst skey ?on-ready BRK

@on-ready ( -> )
	;src decode_ulz
	( export )
	;dst .File/name DEO2
	;mem
		DUP2 .ptr LDZ2 SUB2 .File/length DEO2
		.File/write DEO2
	( halt ) #800f DEO
	BRK

@decode_ulz ( str* -- )
	;mem .ptr STZ2
	.File/name DEO2
	&stream ( -- )
		#0001 .File/length DEO2
		;&b
			DUP2 .File/read DEO2
			.File/success DEI2 ORA ?{ POP2 JMP2r }
			[ LIT &b $1 ] decode_ulz_byte
		!&stream

@decode_ulz_byte ( byte -- )
	DUP #80 AND ?op-cpy

@op-lit ( byte -- )
	#00 SWP INC2
		DUP2 .File/length DEO2
		.ptr LDZ2
			DUP2 .File/read DEO2
			ADD2 .ptr STZ2
	JMP2r

@op-cpy ( byte -- )
	#7f AND
		DUP #40 AND ?{
			#00 SWP !&copy }
	#3f AND getc
&copy ( length* -- )
	.ptr LDZ2 #00 getc INC2 SUB2 STH2
	#0004 ADD2 #0000
	&l ( -- )
		( get ) DUP2 STH2kr ADD2 LDA
		( put ) .ptr LDZ2 STAk INC2 .ptr STZ2 POP
		INC2 GTH2k ?&l
	POP2 POP2 POP2r
	JMP2r

(
@|stdlib )

@skey ( key buf -- proc ) OVR #21 LTH ?&eval #00 SWP sput #00 JMP2r &eval POP2 #01 JMP2r
@scap ( str* -- end* ) &w INC2 & LDAk ?&w JMP2r
@sput ( chr str* -- ) scap/ INC2k #00 ROT ROT STA STA JMP2r
@getc ( -- b ) #0001 .File/length DEO2 ;&b .File/read DEO2 [ LIT &b $1 ] JMP2r

@mem