From 648a308d87a0eb9d8026b7621c68b6e594177370 Mon Sep 17 00:00:00 2001 From: Emmanuel Marty Date: Thu, 26 Sep 2019 07:48:19 +0200 Subject: [PATCH] Rename --- asm/z80/unlzsa1_fast_v1.asm | 155 ------------------------------------ 1 file changed, 155 deletions(-) delete mode 100644 asm/z80/unlzsa1_fast_v1.asm diff --git a/asm/z80/unlzsa1_fast_v1.asm b/asm/z80/unlzsa1_fast_v1.asm deleted file mode 100644 index 66e0f35..0000000 --- a/asm/z80/unlzsa1_fast_v1.asm +++ /dev/null @@ -1,155 +0,0 @@ -; -; Speed-optimized LZSA1 decompressor by spke (v.2 03/04/2019-27/08/2019; 111 bytes); -; with improvements by uniabis (30/07/2019,22/08/2019; -3 bytes, +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 -; -; 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 -; -; 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 COPY_MATCH - ldi : ldi : ldir - ENDM - - MACRO BLOCKCOPY - ldir - ENDM - - ELSE - - MACRO NEXT_HL - dec hl - ENDM - - MACRO ADD_OFFSET - ex de,hl : ld a,e : sub l : ld l,a - ld a,d : sbc h : ld h,a ; 4*4+3*4 = 28t / 7 bytes - ENDM - - MACRO COPY_MATCH - ldd : ldd : lddr - ENDM - - MACRO BLOCKCOPY - lddr - ENDM - - ENDIF - -@DecompressLZSA1: - ld b,0 : jr ReadToken - -NoLiterals: xor (hl) - push de : NEXT_HL : ld e,(hl) : jp m,LongOffset - - ; short matches have length 0+3..14+3 -ShortOffset: ld d,#FF : add 3 : cp 15+3 : jr nc,LongerMatch - - ; placed here this saves a JP per iteration -CopyMatch: ld c,a -.UseC NEXT_HL : ex (sp),hl ; BC = len, DE = offset, HL = dest, SP ->[dest,src] - ADD_OFFSET ; BC = len, DE = dest, HL = dest-offset, SP->[src] - COPY_MATCH : pop hl ; BC = 0, DE = dest, HL = src - -ReadToken: ; 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 - ld a,(hl) : and #70 : jr z,NoLiterals - - cp #70 : jr z,MoreLiterals ; LLL=7 means 7+ literals... - rrca : rrca : rrca : rrca ; LLL<7 means 0..6 literals... - - ld c,a : ld a,(hl) - NEXT_HL : BLOCKCOPY - - ; next we read the first byte of the offset - push de : ld e,(hl) - ; the top bit of token is set if the offset contains two bytes - and #8F : jp p,ShortOffset - -LongOffset: ; read second byte of the offset - NEXT_HL : ld d,(hl) - add -128+3 : cp 15+3 : jp c,CopyMatch - - ; MMMM=15 indicates a multi-byte number of literals -LongerMatch: NEXT_HL : add (hl) : jr nc,CopyMatch - - ; 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 : NEXT_HL : ld c,(hl) : jr nz,CopyMatch.UseC -.code0 NEXT_HL : ld b,(hl) - - ; the two-byte match length equal to zero - ; designates the end-of-data marker - ld a,b : or c : jr nz,CopyMatch.UseC - pop de : ret - -MoreLiterals: ; there are three possible situations here - xor (hl) : exa - ld a,7 : NEXT_HL : add (hl) : jr c,ManyLiterals - -CopyLiterals: ld c,a -.UseC NEXT_HL : BLOCKCOPY - - push de : ld e,(hl) - exa : jp p,ShortOffset : jr LongOffset - -ManyLiterals: -.code1 ld b,a : NEXT_HL : ld c,(hl) : jr nz,CopyLiterals.UseC -.code0 NEXT_HL : ld b,(hl) : jr CopyLiterals.UseC - -