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uxn-utils
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(lz) Progress

This commit is contained in:
neauoire 2023-11-18 14:09:09 -08:00
parent 54b79ee5aa
commit 239ccde418
1 changed files with 56 additions and 46 deletions
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100
cli/lz/ulzenc.tal
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@ -45,6 +45,61 @@
.output-ptr LDZ2 INC2k .output-ptr STZ2 STA
JMP2r
@uxn_lz_compress ( input* length* -- )
( fill variables )
;raw .output-ptr STZ2
ADD2k NIP2 SWP2
&w ( -- )
( | get available dictionary size )
DUP2 ;raw SUB2 #0100 LTH2k ?{ SWP2 }
POP2 .dict-len STZ2
( | size of the string to search for )
SUB2k #3fff #0004 ADD2 LTH2k ?{ SWP2 }
POP2 ,&string-len STR2
( | debug )
.dict-len LDZ2 phex #2018 DEO ,&string-len LDR2 phex #2018 DEO
( | itterate through the dictionary )
#0000 .match-len STZ2
DUP2 .dict-len LDZ2 SUB2 .dict STZ2
&for1 ( dict-len-- != 0 )
.dict-len LDZ2 #0000 EQU2 ?&done-search
( Find common prefix length with the string )
#0000
&for2 ( i++ != 0 )
( If we reach the end of the string, it's the best possible match. )
DUP2 [ LIT2 &string-len $2 ] NEQ2 ?{
DUP2 .match-len STZ2
.dict LDZ2 .dict-best STZ2
POP2 POP2 !&done-search }
( Dictionary repeats if we hit the end )
( in[i] != dict[i % dict_len] break; )
( b ) DUP2 .dict-len LDZ2 DIV2k MUL2 SUB2 .dict LDZ2 ADD2 LDA
( a ) ADD2k LDA
NEQ ?&end
INC2 ORAk ?&for2
&end
( i > match_len )
DUP2 .match-len LDZ2 GTH2 #00 EQU ?{
DUP2 .match-len STZ2
.dict LDZ2 .dict-best STZ2 }
POP2
.dict LDZ2 INC2 .dict STZ2
#0001 SUB2 !&for1
POP2
&done-search ( -- )
.match-len LDZ2 phex #0a18 DEO
( CPY ) .match-len LDZ2 #0003 GTH2 ?op-cpy
( LIT ) op-lit
NEQ2k ?&w
JMP2r
(
@|opcodes )
@op-cpy ( in* -- )
( More numeric range: treat 0 as 4, 1 as 5, etc. )
.match-len LDZ2 #0004 SUB2 .match-ctl STZ2
@ -85,51 +140,6 @@
LDAk <append-byte>
INC2 !uxn_lz_compress/w
@uxn_lz_compress ( input* length* -- )
ADD2k NIP2 SWP2
&w ( -- )
( | get available dictionary size )
DUP2 ;raw SUB2 #0100 LTH2k ?{ SWP2 }
POP2 .dict-len STZ2
( | size of the string to search for )
SUB2k #3fff #0004 ADD2 LTH2k ?{ SWP2 }
POP2 ,&string-len STR2
( | itterate through the dictionary )
#0000 .match-len STZ2
.dict-len LDZ2 SUB2k .dict STZ2
( | create a few inlines )
DUP2 ,&in STR2
&for1 ( dict-len != 0 )
( Find common prefix length with the string )
#0000
&for2 ( i != 0 )
( If we reach the end of the string, it's the best possible match. )
DUP2 [ LIT2 &string-len $2 ] NEQ2 ?{
DUP2 .match-len STZ2
.dict LDZ2 .dict-best STZ2
POP2 POP2 !&done-search }
( Dictionary repeats if we hit the end )
( in[i] != dict[i % dict_len] break; )
DUP2 [ LIT2 &in $2 ] ADD2 LDA2
OVR2 .dict-len LDZ2 DIV2k MUL2 SUB2
.dict LDZ2 ADD2 LDA2 NEQ2 ?&end
INC2 ORAk ?&for2
&end
( i > match_len )
DUP2 .match-len LDZ2 GTH2 #00 EQU ?{
DUP2 .match-len STZ2
.dict-len LDZ2 .dict STZ2 }
POP2
.dict LDZ2 INC2 .dict STZ2
#0001 SUB2 ORAk ?&for1
POP2
&done-search ( -- )
( CPY ) .match-len LDZ2 #0003 GTH2 ?op-cpy
( LIT ) op-lit
NEQ2k ?&w
JMP2r
(
@|stdlib )