mirror of
https://github.com/emmanuel-marty/lzsa.git
synced 2025-02-06 14:30:38 +00:00
Merge pull request #19 from specke/master
Support for -b in Z80 decompressors
This commit is contained in:
Emmanuel Marty
GitHub
commit
fd70be918c
84
asm/z80/unlzsa_fast_v1.asm → asm/z80/unlzsa1_fast_v1.asm
Executable file → Normal file
84
asm/z80/unlzsa_fast_v1.asm → asm/z80/unlzsa1_fast_v1.asm
Executable file → Normal file
@ -4,16 +4,28 @@
|
||||
; The data must be compressed using the command line compressor by Emmanuel Marty
|
||||
; The compression is done as follows:
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||||
;
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; lzsa.exe -r <sourcefile> <outfile>
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; lzsa.exe -f1 -r <sourcefile> <outfile>
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;
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; where option -r asks for the generation of raw (frame-less) data.
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;
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; The decompression is done in the standard way:
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;
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; ld hl,CompressedData
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; ld de,WhereToDecompress
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; ld hl,FirstByteOfCompressedData
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; ld de,FirstByteOfMemoryForDecompressedData
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; call DecompressLZSA
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;
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; Backward compression is also supported; you can compress files backward using:
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;
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; lzsa.exe -f1 -r -b <sourcefile> <outfile>
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;
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; and decompress the resulting files using:
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;
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; ld hl,LastByteOfCompressedData
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; ld de,LastByteOfMemoryForDecompressedData
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; call DecompressLZSA
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;
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; (do not forget to uncomment the BACKWARD_DECOMPRESS option in the decompressor).
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;
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; Of course, LZSA compression algorithm is (c) 2019 Emmanuel Marty,
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; see https://github.com/emmanuel-marty/lzsa for more information
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;
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@ -35,11 +47,43 @@
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; misrepresented as being the original software.
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; 3. This notice may not be removed or altered from any source distribution.
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; DEFINE BACKWARD_DECOMPRESS
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IFDEF BACKWARD_DECOMPRESS
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MACRO NEXT_HL
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dec hl
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ENDM
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MACRO ADD_OFFSET
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or a : sbc hl,de
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ENDM
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MACRO BLOCKCOPY
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lddr
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ENDM
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ELSE
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MACRO NEXT_HL
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inc hl
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ENDM
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MACRO ADD_OFFSET
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add hl,de
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ENDM
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MACRO BLOCKCOPY
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ldir
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ENDM
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ENDIF
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@DecompressLZSA:
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ld b,0 : jr ReadToken
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NoLiterals: xor (hl) : inc hl
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push de : ld e,(hl) : inc hl : jp m,LongOffset
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NoLiterals: xor (hl) : NEXT_HL
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push de : ld e,(hl) : NEXT_HL : jp m,LongOffset
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; short matches have length 0+3..14+3
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ShortOffset: ld d,#FF : add 3 : cp 15+3 : jr nc,LongerMatch
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@ -47,8 +91,8 @@ ShortOffset: ld d,#FF : add 3 : cp 15+3 : jr nc,LongerMatch
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; placed here this saves a JP per iteration
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CopyMatch: ld c,a
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.UseC ex (sp),hl : push hl ; BC = len, DE = offset, HL = dest, SP ->[dest,src]
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add hl,de : pop de ; BC = len, DE = dest, HL = dest-offset, SP->[src]
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ldir : pop hl ; BC = 0, DE = dest, HL = src
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ADD_OFFSET : pop de ; BC = len, DE = dest, HL = dest-offset, SP->[src]
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BLOCKCOPY : pop hl ; BC = 0, DE = dest, HL = src
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ReadToken: ; first a byte token "O|LLL|MMMM" is read from the stream,
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; where LLL is the number of literals and MMMM is
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@ -58,26 +102,26 @@ ReadToken: ; first a byte token "O|LLL|MMMM" is read from the stream,
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cp #70 : jr z,MoreLiterals ; LLL=7 means 7+ literals...
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rrca : rrca : rrca : rrca ; LLL<7 means 0..6 literals...
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ld c,a : ld a,(hl) : inc hl
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ldir
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ld c,a : ld a,(hl) : NEXT_HL
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BLOCKCOPY
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; next we read the first byte of the offset
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push de : ld e,(hl) : inc hl
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push de : ld e,(hl) : NEXT_HL
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; the top bit of token is set if the offset contains two bytes
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and #8F : jp p,ShortOffset
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LongOffset: ; read second byte of the offset
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ld d,(hl) : inc hl
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ld d,(hl) : NEXT_HL
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add -128+3 : cp 15+3 : jp c,CopyMatch
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; MMMM=15 indicates a multi-byte number of literals
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LongerMatch: add (hl) : inc hl : jr nc,CopyMatch
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LongerMatch: add (hl) : NEXT_HL : jr nc,CopyMatch
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; the codes are designed to overflow;
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; the overflow value 1 means read 1 extra byte
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; and overflow value 0 means read 2 extra bytes
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.code1 ld b,a : ld c,(hl) : inc hl : jr nz,CopyMatch.UseC
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.code0 ld b,(hl) : inc hl
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.code1 ld b,a : ld c,(hl) : NEXT_HL : jr nz,CopyMatch.UseC
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.code0 ld b,(hl) : NEXT_HL
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; the two-byte match length equal to zero
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; designates the end-of-data marker
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@ -85,17 +129,17 @@ LongerMatch: add (hl) : inc hl : jr nc,CopyMatch
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pop de : ret
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MoreLiterals: ; there are three possible situations here
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xor (hl) : inc hl : exa
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ld a,7 : add (hl) : inc hl : jr c,ManyLiterals
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xor (hl) : NEXT_HL : exa
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ld a,7 : add (hl) : NEXT_HL : jr c,ManyLiterals
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CopyLiterals: ld c,a
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.UseC ldir
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.UseC BLOCKCOPY
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push de : ld e,(hl) : inc hl
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push de : ld e,(hl) : NEXT_HL
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exa : jp p,ShortOffset : jr LongOffset
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ManyLiterals:
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.code1 ld b,a : ld c,(hl) : inc hl : jr nz,CopyLiterals.UseC
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.code0 ld b,(hl) : inc hl : jr CopyLiterals.UseC
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.code1 ld b,a : ld c,(hl) : NEXT_HL : jr nz,CopyLiterals.UseC
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.code0 ld b,(hl) : NEXT_HL : jr CopyLiterals.UseC
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69
asm/z80/unlzsa_small_v1.asm → asm/z80/unlzsa1_small_v1.asm
Executable file → Normal file
69
asm/z80/unlzsa_small_v1.asm → asm/z80/unlzsa1_small_v1.asm
Executable file → Normal file
@ -4,16 +4,28 @@
|
||||
; The data must be compressed using the command line compressor by Emmanuel Marty
|
||||
; The compression is done as follows:
|
||||
;
|
||||
; lzsa.exe -r <sourcefile> <outfile>
|
||||
; lzsa.exe -f1 -r <sourcefile> <outfile>
|
||||
;
|
||||
; where option -r asks for the generation of raw (frame-less) data.
|
||||
;
|
||||
; The decompression is done in the standard way:
|
||||
;
|
||||
; ld hl,CompressedData
|
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; ld de,WhereToDecompress
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; ld hl,FirstByteOfCompressedData
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; ld de,FirstByteOfMemoryForDecompressedData
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; call DecompressLZSA
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;
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; Backward compression is also supported; you can compress files backward using:
|
||||
;
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; lzsa.exe -f1 -r -b <sourcefile> <outfile>
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;
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; and decompress the resulting files using:
|
||||
;
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; ld hl,LastByteOfCompressedData
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; ld de,LastByteOfMemoryForDecompressedData
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; call DecompressLZSA
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;
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; (do not forget to uncomment the BACKWARD_DECOMPRESS option in the decompressor).
|
||||
;
|
||||
; Of course, LZSA compression algorithm is (c) 2019 Emmanuel Marty,
|
||||
; see https://github.com/emmanuel-marty/lzsa for more information
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||||
;
|
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@ -34,7 +46,38 @@
|
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; 2. Altered source versions must be plainly marked as such, and must not be
|
||||
; misrepresented as being the original software.
|
||||
; 3. This notice may not be removed or altered from any source distribution.
|
||||
;
|
||||
|
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; DEFINE BACKWARD_DECOMPRESS
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IFDEF BACKWARD_DECOMPRESS
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MACRO NEXT_HL
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dec hl
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ENDM
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MACRO ADD_OFFSET
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or a : sbc hl,de
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ENDM
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MACRO BLOCKCOPY
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lddr
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ENDM
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ELSE
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MACRO NEXT_HL
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inc hl
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ENDM
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MACRO ADD_OFFSET
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add hl,de
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ENDM
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MACRO BLOCKCOPY
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ldir
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ENDM
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ENDIF
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@DecompressLZSA:
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ld b,0
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@ -42,21 +85,21 @@
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; first a byte token "O|LLL|MMMM" is read from the stream,
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; where LLL is the number of literals and MMMM is
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; a length of the match that follows after the literals
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ReadToken: ld a,(hl) : exa : ld a,(hl) : inc hl
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ReadToken: ld a,(hl) : exa : ld a,(hl) : NEXT_HL
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and #70 : jr z,NoLiterals
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rrca : rrca : rrca : rrca ; LLL<7 means 0..6 literals...
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cp #07 : call z,ReadLongBA ; LLL=7 means 7+ literals...
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ld c,a : ldir
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ld c,a : BLOCKCOPY
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; next we read the low byte of the -offset
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NoLiterals: push de : ld e,(hl) : inc hl : ld d,#FF
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NoLiterals: push de : ld e,(hl) : NEXT_HL : ld d,#FF
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; the top bit of token is set if
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; the offset contains the high byte as well
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exa : or a : jp p,ShortOffset
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LongOffset: ld d,(hl) : inc hl
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LongOffset: ld d,(hl) : NEXT_HL
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; last but not least, the match length is read
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ShortOffset: and #0F : add 3 ; MMMM<15 means match lengths 0+3..14+3
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@ -64,19 +107,19 @@ ShortOffset: and #0F : add 3 ; MMMM<15 means match lengths 0+3..14+3
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ld c,a
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ex (sp),hl : push hl ; BC = len, DE = -offset, HL = dest, SP ->[dest,src]
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add hl,de : pop de ; BC = len, DE = dest, HL = dest+(-offset), SP->[src]
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ldir : pop hl ; BC = 0, DE = dest, HL = src
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ADD_OFFSET : pop de ; BC = len, DE = dest, HL = dest+(-offset), SP->[src]
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BLOCKCOPY : pop hl ; BC = 0, DE = dest, HL = src
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jr ReadToken
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; a standard routine to read extended codes
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; into registers B (higher byte) and A (lower byte).
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ReadLongBA: add (hl) : inc hl : ret nc
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ReadLongBA: add (hl) : NEXT_HL : ret nc
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; the codes are designed to overflow;
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; the overflow value 1 means read 1 extra byte
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; and overflow value 0 means read 2 extra bytes
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.code1: ld b,a : ld a,(hl) : inc hl : ret nz
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.code0: ld c,a : ld b,(hl) : inc hl
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.code1: ld b,a : ld a,(hl) : NEXT_HL : ret nz
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.code0: ld c,a : ld b,(hl) : NEXT_HL
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; the two-byte match length equal to zero
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; designates the end-of-data marker
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@ -10,15 +10,74 @@
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;
|
||||
; The decompression is done in the standard way:
|
||||
;
|
||||
; ld hl,CompressedData
|
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; ld de,WhereToDecompress
|
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; ld hl,FirstByteOfCompressedData
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; ld de,FirstByteOfMemoryForDecompressedData
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; call DecompressLZSA2
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;
|
||||
; Backward compression is also supported; you can compress files backward using:
|
||||
;
|
||||
; lzsa.exe -f2 -r -b <sourcefile> <outfile>
|
||||
;
|
||||
; and decompress the resulting files using:
|
||||
;
|
||||
; ld hl,LastByteOfCompressedData
|
||||
; ld de,LastByteOfMemoryForDecompressedData
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; call DecompressLZSA2
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;
|
||||
; (do not forget to uncomment the BACKWARD_DECOMPRESS option in the decompressor).
|
||||
;
|
||||
; Of course, LZSA2 compression algorithm is (c) 2019 Emmanuel Marty,
|
||||
; see https://github.com/emmanuel-marty/lzsa for more information
|
||||
;
|
||||
; Drop me an email if you have any comments/ideas/suggestions: zxintrospec@gmail.com
|
||||
;
|
||||
; This software is provided 'as-is', without any express or implied
|
||||
; warranty. In no event will the authors be held liable for any damages
|
||||
; arising from the use of this software.
|
||||
;
|
||||
; Permission is granted to anyone to use this software for any purpose,
|
||||
; including commercial applications, and to alter it and redistribute it
|
||||
; freely, subject to the following restrictions:
|
||||
;
|
||||
; 1. The origin of this software must not be misrepresented; you must not
|
||||
; claim that you wrote the original software. If you use this software
|
||||
; in a product, an acknowledgment in the product documentation would be
|
||||
; appreciated but is not required.
|
||||
; 2. Altered source versions must be plainly marked as such, and must not be
|
||||
; misrepresented as being the original software.
|
||||
; 3. This notice may not be removed or altered from any source distribution.
|
||||
|
||||
; DEFINE BACKWARD_DECOMPRESS
|
||||
|
||||
IFDEF BACKWARD_DECOMPRESS
|
||||
|
||||
MACRO NEXT_HL
|
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dec hl
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ENDM
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|
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MACRO ADD_OFFSET
|
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or a : sbc hl,de
|
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ENDM
|
||||
|
||||
MACRO BLOCKCOPY
|
||||
lddr
|
||||
ENDM
|
||||
|
||||
ELSE
|
||||
|
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MACRO NEXT_HL
|
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inc hl
|
||||
ENDM
|
||||
|
||||
MACRO ADD_OFFSET
|
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add hl,de
|
||||
ENDM
|
||||
|
||||
MACRO BLOCKCOPY
|
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ldir
|
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ENDM
|
||||
|
||||
ENDIF
|
||||
|
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@DecompressLZSA2:
|
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; A' stores next nibble as %1111.... or assumed to contain trash
|
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@ -32,16 +91,16 @@
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LongerMatch: exa : jp m,.noUpdate
|
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|
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ld a,(hl) : or #F0 : exa
|
||||
ld a,(hl) : inc hl : or #0F
|
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ld a,(hl) : NEXT_HL : or #0F
|
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rrca : rrca : rrca : rrca
|
||||
|
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.noUpdate sub #F0-9 : cp 15+9 : jr c,CopyMatch
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;inc a : jr z,LongMatch : sub #F0-9+1 : jp CopyMatch
|
||||
|
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LongMatch: ;ld a,24 :
|
||||
add (hl) : inc hl : jr nc,CopyMatch
|
||||
ld c,(hl) : inc hl
|
||||
ld b,(hl) : inc hl
|
||||
add (hl) : NEXT_HL : jr nc,CopyMatch
|
||||
ld c,(hl) : NEXT_HL
|
||||
ld b,(hl) : NEXT_HL
|
||||
jr nz,CopyMatch.useC
|
||||
pop de : ret
|
||||
|
||||
@ -49,19 +108,19 @@ LongMatch: ;ld a,24 :
|
||||
|
||||
|
||||
ManyLiterals: ld a,18 :
|
||||
add (hl) : inc hl : jr nc,CopyLiterals
|
||||
ld c,(hl) : inc hl
|
||||
add (hl) : NEXT_HL : jr nc,CopyLiterals
|
||||
ld c,(hl) : NEXT_HL
|
||||
ld a,b : ld b,(hl) : inc hl
|
||||
jr CopyLiterals.useBC
|
||||
|
||||
|
||||
|
||||
|
||||
MoreLiterals: ld b,(hl) : inc hl
|
||||
MoreLiterals: ld b,(hl) : NEXT_HL
|
||||
exa : jp m,.noUpdate
|
||||
|
||||
ld a,(hl) : or #F0 : exa
|
||||
ld a,(hl) : inc hl : or #0F
|
||||
ld a,(hl) : NEXT_HL : or #0F
|
||||
rrca : rrca : rrca : rrca
|
||||
|
||||
.noUpdate ;sub #F0-3 : cp 15+3 : jr z,ManyLiterals
|
||||
@ -69,7 +128,7 @@ MoreLiterals: ld b,(hl) : inc hl
|
||||
|
||||
CopyLiterals: ld c,a
|
||||
.useC ld a,b : ld b,0
|
||||
.useBC ldir
|
||||
.useBC BLOCKCOPY
|
||||
push de : or a : jp p,CASE0xx : jr CASE1xx
|
||||
|
||||
|
||||
@ -78,7 +137,7 @@ CopyLiterals: ld c,a
|
||||
|
||||
; if "LL" of the byte token is equal to 0,
|
||||
; there are no literals to copy
|
||||
NoLiterals: xor (hl) : inc hl
|
||||
NoLiterals: xor (hl) : NEXT_HL
|
||||
push de : jp m,CASE1xx
|
||||
|
||||
; short (5 or 9 bit long) offsets
|
||||
@ -87,7 +146,7 @@ CASE0xx ld d,#FF : cp %01000000 : jr c,CASE00x
|
||||
; "01x": the case of the 9-bit offset
|
||||
CASE01x: cp %01100000 : rl d
|
||||
|
||||
ReadOffsetE: ld e,(hl) : inc hl
|
||||
ReadOffsetE: ld e,(hl) : NEXT_HL
|
||||
|
||||
SaveOffset: ld ixl,e : ld ixh,d
|
||||
|
||||
@ -95,8 +154,8 @@ MatchLen: inc a : and %00000111 : jr z,LongerMatch : inc a
|
||||
|
||||
CopyMatch: ld c,a
|
||||
.useC ex (sp),hl : push hl ; BC = len, DE = offset, HL = dest, SP ->[dest,src]
|
||||
add hl,de : pop de ; BC = len, DE = dest, HL = dest-offset, SP->[src]
|
||||
ldir : pop hl
|
||||
ADD_OFFSET : pop de ; BC = len, DE = dest, HL = dest-offset, SP->[src]
|
||||
BLOCKCOPY : pop hl
|
||||
|
||||
; compressed data stream contains records
|
||||
; each record begins with the byte token "XYZ|LL|MMM"
|
||||
@ -105,8 +164,8 @@ ReadToken: ld a,(hl) : and %00011000 : jr z,NoLiterals
|
||||
jp pe,MoreLiterals ; 00 has already been processed; this identifies the case of 11
|
||||
rrca : rrca : rrca
|
||||
|
||||
ld c,a : ld a,(hl) : inc hl ; token is re-read for further processing
|
||||
ldir
|
||||
ld c,a : ld a,(hl) : NEXT_HL ; token is re-read for further processing
|
||||
BLOCKCOPY
|
||||
|
||||
; the token and literals are followed by the offset
|
||||
push de : or a : jp p,CASE0xx
|
||||
@ -118,7 +177,7 @@ CASE10x: ld c,a : xor a
|
||||
exa : jp m,.noUpdate
|
||||
|
||||
ld a,(hl) : or #F0 : exa
|
||||
ld a,(hl) : inc hl : or #0F
|
||||
ld a,(hl) : NEXT_HL : or #0F
|
||||
rrca : rrca : rrca : rrca
|
||||
|
||||
.noUpdate ld d,a : ld a,c
|
||||
@ -130,7 +189,7 @@ CASE00x: ld c,a : xor a
|
||||
exa : jp m,.noUpdate
|
||||
|
||||
ld a,(hl) : or #F0 : exa
|
||||
ld a,(hl) : inc hl : or #0F
|
||||
ld a,(hl) : NEXT_HL : or #0F
|
||||
rrca : rrca : rrca : rrca
|
||||
|
||||
.noUpdate ld e,a : ld a,c
|
||||
@ -143,15 +202,7 @@ CASE11x cp %11100000 : jr c,CASE110
|
||||
CASE111: ld e,ixl : ld d,ixh : jr MatchLen
|
||||
|
||||
; "110": 16-bit offset
|
||||
CASE110: ld d,(hl) : inc hl : jr ReadOffsetE
|
||||
|
||||
;ReadNibble: ; 17 bytes, 44 t-state per nibble
|
||||
; exa : ret m ; 4+11 = 15t
|
||||
;UpdateNibble:
|
||||
; ld a,(hl) : or #F0 : exa
|
||||
; ld a,(hl) : inc hl : or #0F
|
||||
; rrca : rrca : rrca : rrca : ret ; 4+5 + 7+7+4+7+6+7+4+4+4+4+10 = 73t
|
||||
|
||||
CASE110: ld d,(hl) : NEXT_HL : jr ReadOffsetE
|
||||
|
||||
|
||||
|
||||
|
||||
@ -10,15 +10,75 @@
|
||||
;
|
||||
; The decompression is done in the standard way:
|
||||
;
|
||||
; ld hl,CompressedData
|
||||
; ld de,WhereToDecompress
|
||||
; ld hl,FirstByteOfCompressedData
|
||||
; ld de,FirstByteOfMemoryForDecompressedData
|
||||
; call DecompressLZSA2
|
||||
;
|
||||
; Backward compression is also supported; you can compress files backward using:
|
||||
;
|
||||
; lzsa.exe -f2 -r -b <sourcefile> <outfile>
|
||||
;
|
||||
; and decompress the resulting files using:
|
||||
;
|
||||
; ld hl,LastByteOfCompressedData
|
||||
; ld de,LastByteOfMemoryForDecompressedData
|
||||
; call DecompressLZSA2
|
||||
;
|
||||
; (do not forget to uncomment the BACKWARD_DECOMPRESS option in the decompressor).
|
||||
;
|
||||
; Of course, LZSA2 compression algorithm is (c) 2019 Emmanuel Marty,
|
||||
; see https://github.com/emmanuel-marty/lzsa for more information
|
||||
;
|
||||
; Drop me an email if you have any comments/ideas/suggestions: zxintrospec@gmail.com
|
||||
;
|
||||
; This software is provided 'as-is', without any express or implied
|
||||
; warranty. In no event will the authors be held liable for any damages
|
||||
; arising from the use of this software.
|
||||
;
|
||||
; Permission is granted to anyone to use this software for any purpose,
|
||||
; including commercial applications, and to alter it and redistribute it
|
||||
; freely, subject to the following restrictions:
|
||||
;
|
||||
; 1. The origin of this software must not be misrepresented; you must not
|
||||
; claim that you wrote the original software. If you use this software
|
||||
; in a product, an acknowledgment in the product documentation would be
|
||||
; appreciated but is not required.
|
||||
; 2. Altered source versions must be plainly marked as such, and must not be
|
||||
; misrepresented as being the original software.
|
||||
; 3. This notice may not be removed or altered from any source distribution.
|
||||
;
|
||||
|
||||
; DEFINE BACKWARD_DECOMPRESS
|
||||
|
||||
IFDEF BACKWARD_DECOMPRESS
|
||||
|
||||
MACRO NEXT_HL
|
||||
dec hl
|
||||
ENDM
|
||||
|
||||
MACRO ADD_OFFSET
|
||||
or a : sbc hl,de
|
||||
ENDM
|
||||
|
||||
MACRO BLOCKCOPY
|
||||
lddr
|
||||
ENDM
|
||||
|
||||
ELSE
|
||||
|
||||
MACRO NEXT_HL
|
||||
inc hl
|
||||
ENDM
|
||||
|
||||
MACRO ADD_OFFSET
|
||||
add hl,de
|
||||
ENDM
|
||||
|
||||
MACRO BLOCKCOPY
|
||||
ldir
|
||||
ENDM
|
||||
|
||||
ENDIF
|
||||
|
||||
@DecompressLZSA2:
|
||||
xor a : ld b,a : exa : jr ReadToken
|
||||
@ -27,7 +87,7 @@ CASE0xx ld d,#FF : cp %01000000 : jr c,CASE00x
|
||||
|
||||
CASE01x: cp %01100000 : rl d
|
||||
|
||||
OffsetReadE: ld e,(hl) : inc hl
|
||||
OffsetReadE: ld e,(hl) : NEXT_HL
|
||||
|
||||
SaveOffset: ld iyl,e : ld iyh,d
|
||||
|
||||
@ -35,17 +95,17 @@ MatchLen: and %00000111 : add 2 : cp 9 : call z,ExtendedCode
|
||||
|
||||
CopyMatch: ld c,a
|
||||
ex (sp),hl : push hl ; BC = len, DE = offset, HL = dest, SP ->[dest,src]
|
||||
add hl,de : pop de ; BC = len, DE = dest, HL = dest-offset, SP->[src]
|
||||
ldir : pop hl
|
||||
ADD_OFFSET : pop de ; BC = len, DE = dest, HL = dest-offset, SP->[src]
|
||||
BLOCKCOPY : pop hl
|
||||
|
||||
ReadToken: ld a,(hl) : ld ixl,a : inc hl
|
||||
ReadToken: ld a,(hl) : ld ixl,a : NEXT_HL
|
||||
and %00011000 : jr z,NoLiterals
|
||||
|
||||
rrca : rrca : rrca
|
||||
call pe,ExtendedCode
|
||||
|
||||
ld c,a
|
||||
ldir
|
||||
BLOCKCOPY
|
||||
|
||||
NoLiterals: push de : ld a,ixl
|
||||
or a : jp p,CASE0xx
|
||||
@ -65,18 +125,18 @@ CASE11x cp %11100000 : jr c,CASE110
|
||||
|
||||
CASE111: ld e,iyl : ld d,iyh : jr MatchLen
|
||||
|
||||
CASE110: ld d,(hl) : inc hl : jr OffsetReadE
|
||||
CASE110: ld d,(hl) : NEXT_HL : jr OffsetReadE
|
||||
|
||||
ExtendedCode: call ReadNibble : inc a : jr z,ExtraByte
|
||||
sub #F0+1 : add c : ret
|
||||
ExtraByte ld a,15 : add c : add (hl) : inc hl : ret nc
|
||||
ld a,(hl) : inc hl
|
||||
ld b,(hl) : inc hl : ret nz
|
||||
ExtraByte ld a,15 : add c : add (hl) : NEXT_HL : ret nc
|
||||
ld a,(hl) : NEXT_HL
|
||||
ld b,(hl) : NEXT_HL : ret nz
|
||||
pop de : pop de : ret
|
||||
|
||||
ReadNibble: ld c,a : xor a : exa : ret m
|
||||
UpdateNibble ld a,(hl) : or #F0 : exa
|
||||
ld a,(hl) : inc hl : or #0F
|
||||
ld a,(hl) : NEXT_HL : or #0F
|
||||
rrca : rrca : rrca : rrca : ret
|
||||
|
||||
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user