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(lz) Housekeeping

This commit is contained in:
neauoire 2023-11-18 19:58:57 -08:00
parent dabc6723aa
commit f134a4a1c0
1 changed files with 46 additions and 49 deletions
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95
cli/lz/ulzenc.tal
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@ -46,7 +46,8 @@
BRK
@<append-byte> ( byte -- )
.output-ptr LDZ2 INC2k .output-ptr STZ2 STA
.output-ptr LDZ2 INC2k .output-ptr STZ2
STA
JMP2r
@uxn_lz_compress ( input* length* -- )
@ -64,36 +65,33 @@
( | itterate through the dictionary )
#0000 .match-len STZ2
DUP2 .dict-len LDZ2 SUB2 .dict STZ2
&for1 ( for ; dict_len; dict++, dict_len-- )
.dict-len LDZ2 #0000 EQU2 ?&end-for1
( Find common prefix length with the string )
#0000
&for2 ( for i = 0;; i++ )
( | 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 !&done-search }
( | in[i] != dict[i % dict_len] break; )
( a ) ADD2k LDA STH
( b ) DUP2 .dict-len LDZ2 DIV2k MUL2 SUB2 .dict LDZ2 ADD2 LDA STHr
NEQ ?&end-for2
INC2 ORAk ?&for2
&end-for2
( | i > match_len )
DUP2 .match-len LDZ2 LTH2 ?{
DUP2 .match-len STZ2
.dict LDZ2 .dict-best STZ2 }
POP2
.dict LDZ2 INC2 .dict STZ2
.dict-len LDZ2 #0001 SUB2 .dict-len STZ2 !&for1
&end-for1
&for1 ( for ; dict_len; dict++, dict_len-- )
.dict-len LDZ2 #0000 EQU2 ?&end-for1
( Find common prefix length with the string ) #0000
&for2 ( for i = 0;; i++ )
( | 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 !&done-search }
( | in[i] != dict[i % dict_len] break; )
( a ) ADD2k LDA STH
( b ) DUP2 .dict-len LDZ2 DIV2k MUL2 SUB2 .dict LDZ2 ADD2
( res ) LDA STHr NEQ ?&end-for2
INC2 ORAk ?&for2
&end-for2 ( | i > match_len )
DUP2 .match-len LDZ2 LTH2 ?{
DUP2 .match-len STZ2
.dict LDZ2 .dict-best STZ2 }
POP2 .dict LDZ2 INC2 .dict STZ2
.dict-len LDZ2 #0001 SUB2 .dict-len STZ2
!&for1
&end-for1
&done-search ( -- )
( CPY ) .match-len LDZ2 #0003 GTH2 ?op-cpy
( LIT ) !op-lit
&end
POP2 POP2
JMP2r
&end POP2 POP2 JMP2r
(
@|opcodes )
@ -103,40 +101,39 @@
.match-len LDZ2 #0004 SUB2 .match-ctl STZ2
( | CPY2 )
.match-ctl LDZ2 #003f GTH2 ?&cpy2
( | *output_ptr++ = match_ctl | 0x80; )
.match-ctl LDZ2 NIP #80 ORA <append-byte>
!&cpy-resume
&cpy2 ( -- )
.match-ctl LDZ2
SWP #c0 ORA <append-byte> <append-byte>
( | *output_ptr++ = match_ctl | 0x80; )
.match-ctl LDZ2 NIP #80 ORA <append-byte>
!&cpy-resume
&cpy2 ( -- )
.match-ctl LDZ2 SWP #c0 ORA <append-byte>
<append-byte>
&cpy-resume ( -- )
( | *output_ptr++ = in - dict_best - 1; )
DUP2 .dict-best LDZ2 SUB2 #0001 SUB2 NIP <append-byte>
( | in += match_len; Advance input by size of the match )
.match-len LDZ2 ADD2
( | Disable combining previous literal, if any )
#0000 .combine STZ2
!uxn_lz_compress/w
( | *output_ptr++ = in - dict_best - 1; )
DUP2 .dict-best LDZ2 SUB2 #0001 SUB2 NIP <append-byte>
( | in += match_len; Advance input by size of the match )
.match-len LDZ2 ADD2
( | Disable combining previous literal, if any )
#0000 .combine STZ2
!uxn_lz_compress/w
@op-lit ( in* -- )
.combine LDZ2 ORA ?&combine
( | start a new literal )
( | Store this address, and later use it to increment the literal size. )
( | combine = output_ptr++; )
.output-ptr LDZ2
INC2k .output-ptr STZ2
.combine STZ2
.output-ptr LDZ2 INC2k .output-ptr STZ2
.combine STZ2
( | *combine = 0; )
#00 .combine LDZ2 LDA2 STA
( | *output_ptr++ = *in++; )
LDAk <append-byte>
INC2 !uxn_lz_compress/w
&combine ( -- )
( | if ++*combine == 127 )
.combine LDZ2 LDA INC DUP #7f NEQ ?{ POP #00 }
&combine ( -- )
( | if ++*combine == 127 )
.combine LDZ2 LDA INC DUP #7f NEQ ?{ POP #00 }
.combine LDZ2 STA
LDAk <append-byte>
INC2 !uxn_lz_compress/w
LDAk <append-byte>
INC2 !uxn_lz_compress/w
(
@|stdlib )