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LZSA2 decompressors with support for -b option.
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introspec
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@ -10,15 +10,74 @@
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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 DecompressLZSA2
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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 -f2 -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 DecompressLZSA2
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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, LZSA2 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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; Drop me an email if you have any comments/ideas/suggestions: zxintrospec@gmail.com
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;
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; This software is provided 'as-is', without any express or implied
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; warranty. In no event will the authors be held liable for any damages
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; arising from the use of this software.
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;
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; Permission is granted to anyone to use this software for any purpose,
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; including commercial applications, and to alter it and redistribute it
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; freely, subject to the following restrictions:
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;
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; 1. The origin of this software must not be misrepresented; you must not
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; claim that you wrote the original software. If you use this software
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; in a product, an acknowledgment in the product documentation would be
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; appreciated but is not required.
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; 2. Altered source versions must be plainly marked as such, and must not be
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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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@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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ld a,(hl) : or #F0 : exa
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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 :
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add (hl) : inc hl : jr nc,CopyMatch
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ld c,(hl) : inc hl
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ld b,(hl) : inc hl
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add (hl) : NEXT_HL : jr nc,CopyMatch
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ld c,(hl) : NEXT_HL
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ld b,(hl) : NEXT_HL
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jr nz,CopyMatch.useC
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pop de : ret
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@ -49,19 +108,19 @@ LongMatch: ;ld a,24 :
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ManyLiterals: ld a,18 :
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add (hl) : inc hl : jr nc,CopyLiterals
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ld c,(hl) : inc hl
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add (hl) : NEXT_HL : jr nc,CopyLiterals
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ld c,(hl) : NEXT_HL
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ld a,b : ld b,(hl) : inc hl
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jr CopyLiterals.useBC
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MoreLiterals: ld b,(hl) : inc hl
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MoreLiterals: ld b,(hl) : NEXT_HL
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exa : jp m,.noUpdate
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ld a,(hl) : or #F0 : exa
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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 #F0-3 : cp 15+3 : jr z,ManyLiterals
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@ -69,7 +128,7 @@ MoreLiterals: ld b,(hl) : inc hl
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CopyLiterals: ld c,a
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.useC ld a,b : ld b,0
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.useBC ldir
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.useBC BLOCKCOPY
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push de : or a : jp p,CASE0xx : jr CASE1xx
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@ -78,7 +137,7 @@ CopyLiterals: ld c,a
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; if "LL" of the byte token is equal to 0,
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; there are no literals to copy
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NoLiterals: xor (hl) : inc hl
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NoLiterals: xor (hl) : NEXT_HL
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push de : jp m,CASE1xx
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; short (5 or 9 bit long) offsets
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@ -87,7 +146,7 @@ CASE0xx ld d,#FF : cp %01000000 : jr c,CASE00x
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; "01x": the case of the 9-bit offset
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CASE01x: cp %01100000 : rl d
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ReadOffsetE: ld e,(hl) : inc hl
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ReadOffsetE: ld e,(hl) : NEXT_HL
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SaveOffset: ld ixl,e : ld ixh,d
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@ -95,8 +154,8 @@ MatchLen: inc a : and %00000111 : jr z,LongerMatch : inc a
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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
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ADD_OFFSET : pop de ; BC = len, DE = dest, HL = dest-offset, SP->[src]
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BLOCKCOPY : pop hl
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; compressed data stream contains records
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; each record begins with the byte token "XYZ|LL|MMM"
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@ -105,8 +164,8 @@ ReadToken: ld a,(hl) : and %00011000 : jr z,NoLiterals
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jp pe,MoreLiterals ; 00 has already been processed; this identifies the case of 11
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rrca : rrca : rrca
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ld c,a : ld a,(hl) : inc hl ; token is re-read for further processing
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ldir
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ld c,a : ld a,(hl) : NEXT_HL ; token is re-read for further processing
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BLOCKCOPY
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; the token and literals are followed by the offset
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push de : or a : jp p,CASE0xx
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@ -118,7 +177,7 @@ CASE10x: ld c,a : xor a
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exa : jp m,.noUpdate
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ld a,(hl) : or #F0 : exa
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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 ld d,a : ld a,c
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@ -130,7 +189,7 @@ CASE00x: ld c,a : xor a
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exa : jp m,.noUpdate
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ld a,(hl) : or #F0 : exa
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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 ld e,a : ld a,c
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@ -143,15 +202,7 @@ CASE11x cp %11100000 : jr c,CASE110
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CASE111: ld e,ixl : ld d,ixh : jr MatchLen
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; "110": 16-bit offset
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CASE110: ld d,(hl) : inc hl : jr ReadOffsetE
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;ReadNibble: ; 17 bytes, 44 t-state per nibble
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; exa : ret m ; 4+11 = 15t
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;UpdateNibble:
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; ld a,(hl) : or #F0 : exa
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; ld a,(hl) : inc hl : or #0F
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; rrca : rrca : rrca : rrca : ret ; 4+5 + 7+7+4+7+6+7+4+4+4+4+10 = 73t
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CASE110: ld d,(hl) : NEXT_HL : jr ReadOffsetE
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@ -10,15 +10,75 @@
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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 DecompressLZSA2
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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 -f2 -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 DecompressLZSA2
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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, LZSA2 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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; Drop me an email if you have any comments/ideas/suggestions: zxintrospec@gmail.com
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;
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; This software is provided 'as-is', without any express or implied
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; warranty. In no event will the authors be held liable for any damages
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; arising from the use of this software.
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;
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; Permission is granted to anyone to use this software for any purpose,
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; including commercial applications, and to alter it and redistribute it
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; freely, subject to the following restrictions:
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;
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; 1. The origin of this software must not be misrepresented; you must not
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; claim that you wrote the original software. If you use this software
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; in a product, an acknowledgment in the product documentation would be
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; appreciated but is not required.
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; 2. Altered source versions must be plainly marked as such, and must not be
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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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;
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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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@DecompressLZSA2:
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xor a : ld b,a : exa : jr ReadToken
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@ -27,7 +87,7 @@ CASE0xx ld d,#FF : cp %01000000 : jr c,CASE00x
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CASE01x: cp %01100000 : rl d
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OffsetReadE: ld e,(hl) : inc hl
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OffsetReadE: ld e,(hl) : NEXT_HL
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SaveOffset: ld iyl,e : ld iyh,d
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@ -35,17 +95,17 @@ MatchLen: and %00000111 : add 2 : cp 9 : call z,ExtendedCode
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CopyMatch: 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
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ADD_OFFSET : pop de ; BC = len, DE = dest, HL = dest-offset, SP->[src]
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BLOCKCOPY : pop hl
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ReadToken: ld a,(hl) : ld ixl,a : inc hl
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ReadToken: ld a,(hl) : ld ixl,a : NEXT_HL
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and %00011000 : jr z,NoLiterals
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rrca : rrca : rrca
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call pe,ExtendedCode
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ld c,a
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ldir
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BLOCKCOPY
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NoLiterals: push de : ld a,ixl
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or a : jp p,CASE0xx
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@ -65,18 +125,18 @@ CASE11x cp %11100000 : jr c,CASE110
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CASE111: ld e,iyl : ld d,iyh : jr MatchLen
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CASE110: ld d,(hl) : inc hl : jr OffsetReadE
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CASE110: ld d,(hl) : NEXT_HL : jr OffsetReadE
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ExtendedCode: call ReadNibble : inc a : jr z,ExtraByte
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sub #F0+1 : add c : ret
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ExtraByte ld a,15 : add c : add (hl) : inc hl : ret nc
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ld a,(hl) : inc hl
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ld b,(hl) : inc hl : ret nz
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ExtraByte ld a,15 : add c : add (hl) : NEXT_HL : ret nc
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ld a,(hl) : NEXT_HL
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ld b,(hl) : NEXT_HL : ret nz
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pop de : pop de : ret
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ReadNibble: ld c,a : xor a : exa : ret m
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UpdateNibble ld a,(hl) : or #F0 : exa
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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 : ret
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