Rename

2024-12-22 16:30:01 +00:00 · 2019-09-26 07:48:33 +02:00 · 2019-09-26 07:48:33 +02:00 · 2f15298343
commit 2f15298343
parent 648a308d87
1 changed files with 0 additions and 129 deletions
--- a/asm/z80/unlzsa1_small_v1.asm
+++ b/asm/z80/unlzsa1_small_v1.asm
@ -1,129 +0,0 @@
-;
-;  Size-optimized LZSA1 decompressor by spke (v.1 23/04/2019-30/07/2019, 67 bytes);
-;  with improvements by uniabis (30/07/2019, -1 byte, +3% speed).
-;
-;  The data must be compressed using the command line compressor by Emmanuel Marty
-;  The compression is done as follows:
-;
-;  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,FirstByteOfCompressedData
-;  ld de,FirstByteOfMemoryForDecompressedData
-;  call DecompressLZSA1
-;
-;  Backward compression is also supported; you can compress files backward using:
-;
-;  lzsa.exe -f1 -r -b <sourcefile> <outfile>
-;
-;  and decompress the resulting files using:
-;
-;  ld hl,LastByteOfCompressedData
-;  ld de,LastByteOfMemoryForDecompressedData
-;  call DecompressLZSA1
-;
-;  (do not forget to uncomment the BACKWARD_DECOMPRESS option in the decompressor).
-;
-;  Of course, LZSA compression algorithms are (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
-
-	IFNDEF	BACKWARD_DECOMPRESS
-
-		MACRO NEXT_HL
-		inc hl
-		ENDM
-
-		MACRO ADD_OFFSET
-		ex de,hl : add hl,de
-		ENDM
-
-		MACRO BLOCKCOPY
-		ldir
-		ENDM
-
-	ELSE
-
-		MACRO NEXT_HL
-		dec hl
-		ENDM
-
-		MACRO ADD_OFFSET
-		push hl : or a : sbc hl,de : pop de				; 11+4+15+10 = 40t / 5 bytes
-		ENDM
-
-		MACRO BLOCKCOPY
-		lddr
-		ENDM
-
-	ENDIF
-
-@DecompressLZSA1:
-		ld b,0
-
-		; first a byte token "O|LLL|MMMM" is read from the stream,
-		; where LLL is the number of literals and MMMM is
-		; a length of the match that follows after the literals
-ReadToken:	ld a,(hl) : NEXT_HL : push af
-		and #70 : jr z,NoLiterals
-
-		rrca : rrca : rrca : rrca					; LLL<7 means 0..6 literals...
-		cp #07 : call z,ReadLongBA					; LLL=7 means 7+ literals...
-
-		ld c,a : BLOCKCOPY
-
-		; next we read the low byte of the -offset
-NoLiterals:	pop af : push de : ld e,(hl) : NEXT_HL : ld d,#FF
-		; the top bit of token is set if
-		; the offset contains the high byte as well
-		or a : jp p,ShortOffset
-
-LongOffset:	ld d,(hl) : NEXT_HL
-
-		; last but not least, the match length is read
-ShortOffset:	and #0F : add 3							; MMMM<15 means match lengths 0+3..14+3
-		cp 15+3 : call z,ReadLongBA					; MMMM=15 means lengths 14+3+
-		ld c,a
-
-		ex (sp),hl							; BC = len, DE = -offset, HL = dest, SP -> [src]
-		ADD_OFFSET							; BC = len, DE = dest, HL = dest+(-offset), SP -> [src]
-		BLOCKCOPY							; BC = 0, DE = dest
-		pop hl : jr ReadToken						; HL = src
-
-		; a standard routine to read extended codes
-		; into registers B (higher byte) and A (lower byte).
-ReadLongBA:	add (hl) : NEXT_HL : ret nc
-
-		; the codes are designed to overflow;
-		; the overflow value 1 means read 1 extra byte
-		; and overflow value 0 means read 2 extra bytes
-.code1:		ld b,a : ld a,(hl) : NEXT_HL : ret nz
-.code0:		ld c,a : ld b,(hl) : NEXT_HL
-
-		; the two-byte match length equal to zero
-		; designates the end-of-data marker
-		or b : ld a,c : ret nz
-		pop de : pop de : ret
-