149 lines
2.9 KiB
Tal
149 lines
2.9 KiB
Tal
( ulz encoder )
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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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|0000
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@src $30
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@dst $30
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@ptr $1
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@match-len $2
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|0100
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@ready-src ( -> )
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;&await .Console/vector DEO2
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BRK
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&await ( -> )
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.Console/read DEI .src skey ?ready-dst
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BRK
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@ready-dst ( -> )
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;&await .Console/vector DEO2
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BRK
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&await ( -> )
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.Console/read DEI .dst skey ?on-ready
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BRK
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@on-ready ( -> )
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( | load raw )
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;src .File/name DEO2
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#4000 .File/length DEO2
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;raw .File/read DEO2
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;raw .File/success DEI2 uxn_lz_compress
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( halt ) #800f DEO
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BRK
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@<append-byte> ( byte -- )
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.output-ptr LDZ2 INC2k .output-ptr STZ2 STA
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JMP2r
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@uxn_lz_compress ( input* length* -- )
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ADD2k NIP2 SWP2
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&w ( -- )
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( | get available dictionary size )
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DUP2 ;raw SUB2 #0100 LTH2k ?{ SWP2 }
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POP2 ,&dict-len STR2
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( | size of the string to search for )
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SUB2k #3fff #0004 ADD2 LTH2k ?{ SWP2 }
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POP2 ,&string-len STR2
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( | itterate through the dictionary )
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#0000 .match-len STZ2
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[ LIT2 &dict-len $2 ] SUB2k .dict STZ2
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( | create a few inlines )
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DUP2 ,&in STR2
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&for1 ( dict-len != 0 )
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( Find common prefix length with the string )
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#0000
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&for2 ( i != 0 )
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( If we reach the end of the string, it's the best possible match. )
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DUP2 [ LIT2 &string-len $2 ] NEQ2 ?{
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DUP2 .match-len STZ2
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.dict LDZ2 .dict-best STZ2
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POP2 POP2 !&done-search }
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( Dictionary repeats if we hit the end )
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( in[i] != dict[i % dict_len] break; )
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DUP2 [ LIT2 &in $2 ] ADD2 LDA2
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OVR2 ,&dict-len LDR2 DIV2k MUL2 SUB2
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.dict LDZ2 ADD2 LDA2 NEQ2 ?&end
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INC2 ORAk ?&for2
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&end
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( i > match_len )
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DUP2 .match-len LDZ2 GTH2 #00 EQU ?{
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DUP2 .match-len STZ2
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.dict-len LDZ2 .dict STZ2 }
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POP2
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.dict LDZ2 INC2 .dict STZ2
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#0001 SUB2 ORAk ?&for1
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POP2
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&done-search ( -- )
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( CPY )
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.match-len LDZ2 #0004 LTH2 ?&no-cpy
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( More numeric range: treat 0 as 4, 1 as 5, etc. )
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.match-len LDZ2 #0004 SUB2 .match-ctl STZ2
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( CPY2 )
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.match-ctl LDZ2 #003f GTH2 ?&cpy2
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( CPY1 )
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( *output_ptr++ = match_ctl | 0x80; )
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.match-ctl LDZ2 #0080 ORA2 <append-byte>
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!&cpy-resume
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&cpy2
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( TODO )
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&cpy-resume
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( *output_ptr++ = in - dict_best - 1; )
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DUP2 .dict-best LDZ2 #0001 SUB2 SUB2 <append-byte>
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&no-cpy
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( LIT )
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phex #2018 DEO
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phex #0a18 DEO
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( TODO: remove me!! ) INC2 NEQ2k ?&w
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JMP2r
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(
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@|stdlib )
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@skey ( key buf -- proc )
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OVR #21 LTH ?&eval
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#00 SWP sput #00 JMP2r
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&eval POP2 #01 JMP2r
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@scap ( str* -- end* )
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&w INC2 & LDAk ?&w
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JMP2r
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@sput ( chr str* -- )
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scap/ INC2k #00 ROT ROT STA
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STA
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JMP2r
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@getc ( -- b )
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#0001 .File/length DEO2
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;&b .File/read DEO2
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[ LIT &b $1 ] JMP2r
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@phex ( short* -- )
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SWP phex/b
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&b ( -- )
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DUP #04 SFT phex/c
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&c ( -- )
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#0f AND DUP #09 GTH #27 MUL ADD [ LIT "0 ] ADD #18 DEO
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JMP2r
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(
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@|memory )
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@raw $4000
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@compressed $4000
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