72 lines
1.5 KiB
Tal
72 lines
1.5 KiB
Tal
( ulz decoder )
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|10 @Console &vector $2 &read $1 &pad $5 &write $1 &err $1
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|a0 @File &vector $2 &success $2 &stat $2 &delete $1 &append $1 &name $2 &length $2 &read $2 &write $2
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|00 @src $30 @dst $30 @ptr $1
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|0100
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@ready-src ( -> ) ;&await .Console/vector DEO2 BRK
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&await ( -> ) .Console/read DEI .src skey ?ready-dst BRK
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@ready-dst ( -> ) ;&await .Console/vector DEO2 BRK
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&await ( -> ) .Console/read DEI .dst skey ?on-ready BRK
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@on-ready ( -> )
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;src decode_ulz
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( export )
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;dst .File/name DEO2
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;mem
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DUP2 .ptr LDZ2 SUB2 .File/length DEO2
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.File/write DEO2
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( halt ) #800f DEO
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BRK
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@decode_ulz ( str* -- )
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;mem .ptr STZ2
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.File/name DEO2
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&stream ( -- )
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#0001 .File/length DEO2
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;&b
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DUP2 .File/read DEO2
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.File/success DEI2 ORA ?{ POP2 JMP2r }
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[ LIT &b $1 ] decode_ulz_byte
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!&stream
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@decode_ulz_byte ( byte -- )
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DUP #80 AND ?op-dict
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@op-lit ( byte -- )
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#00 SWP INC2
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DUP2 .File/length DEO2
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.ptr LDZ2
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DUP2 .File/read DEO2
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ADD2 .ptr STZ2
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JMP2r
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@op-dict ( byte )
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#7f AND
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DUP #40 AND ?&dict2
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#00 SWP !copy
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&dict2 ( byte -- )
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#3f AND getc
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@copy ( length* -- )
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.ptr LDZ2 #00 getc INC2 SUB2 STH2
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#0004 ADD2 #0000
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&l ( -- )
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( get ) DUP2 STH2kr ADD2 LDA
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( put ) .ptr LDZ2 STAk INC2 .ptr STZ2 POP
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INC2 GTH2k ?&l
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POP2 POP2 POP2r
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JMP2r
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(
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@|stdlib )
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@skey ( key buf -- proc ) OVR #21 LTH ?&eval #00 SWP sput #00 JMP2r &eval POP2 #01 JMP2r
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@scap ( str* -- end* ) &w INC2 & LDAk ?&w JMP2r
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@sput ( chr str* -- ) scap/ INC2k #00 ROT ROT STA STA JMP2r
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@getc ( -- b ) #0001 .File/length DEO2 ;&b .File/read DEO2 [ LIT &b $1 ] JMP2r
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@mem
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