582 lines
13 KiB
PHP
582 lines
13 KiB
PHP
; LZMA decoder for *.7z archives.
|
|
; Based on C decoder in LZMA SDK (c) Igor Pavlov.
|
|
; Portions by Diamond, 2006, 2007.
|
|
lzma_decoder:
|
|
virtual at 0
|
|
.outStream rb streamInfo.size
|
|
.inStream dd ?
|
|
|
|
; RangeDecoder data
|
|
.inLen dd ?
|
|
.inPtr dd ?
|
|
.code dd ?
|
|
.range dd ?
|
|
|
|
; parameters
|
|
.pb db ? ; pos state bits (0 - 4)
|
|
.lp db ? ; literal pos state bits (0 - 4)
|
|
.lc db ? ; literal context bits (0 - 8)
|
|
.previousByte db ?
|
|
.posStateMask dd ? ; (1 shl .pb)-1
|
|
.literalPosMask dd ? ; (1 shl .lp)-1
|
|
|
|
; constants
|
|
.kNumPosBitsMax = 4
|
|
.kNumPosStatesMax = (1 shl .kNumPosBitsMax)
|
|
|
|
.kLenNumLowBits = 3
|
|
.kLenNumLowSymbols = (1 shl .kLenNumLowBits)
|
|
.kLenNumMidBits = 3
|
|
.kLenNumMidSymbols = (1 shl .kLenNumMidBits)
|
|
.kLenNumHighBits = 8
|
|
.kLenNumHighSymbols = (1 shl .kLenNumHighBits)
|
|
|
|
.LenChoice = 0
|
|
.LenChoice2 = 1
|
|
.LenLow = 2
|
|
.LenMid = (.LenLow + (.kNumPosStatesMax shl .kLenNumLowBits))
|
|
.LenHigh = (.LenMid + (.kNumPosStatesMax shl .kLenNumMidBits))
|
|
.kNumLenProbs = (.LenHigh + .kLenNumHighSymbols)
|
|
|
|
.kNumStates = 12
|
|
.kNumLitStates = 7
|
|
.kStartPosModelIndex = 4
|
|
.kEndPosModelIndex = 14
|
|
.kNumFullDistances = (1 shl (.kEndPosModelIndex/2))
|
|
.kNumPosSlotBits = 6
|
|
.kNumLenToPosStates = 4
|
|
.kNumAlignBits = 4
|
|
.kAlignTableSize = (1 shl .kNumAlignBits)
|
|
.kMatchMinLen = 2
|
|
|
|
.IsMatch = 0
|
|
.IsRep = (.IsMatch + (.kNumStates shl .kNumPosBitsMax))
|
|
.IsRepG0 = (.IsRep + .kNumStates)
|
|
.IsRepG1 = (.IsRepG0 + .kNumStates)
|
|
.IsRepG2 = (.IsRepG1 + .kNumStates)
|
|
.IsRep0Long = (.IsRepG2 + .kNumStates)
|
|
.PosSlot = (.IsRep0Long + (.kNumStates shl .kNumPosBitsMax))
|
|
.SpecPos = (.PosSlot + (.kNumLenToPosStates shl .kNumPosSlotBits))
|
|
.Align_ = (.SpecPos + .kNumFullDistances - .kEndPosModelIndex)
|
|
.Lencoder = (.Align_ + .kAlignTableSize)
|
|
.RepLencoder = (.Lencoder + .kNumLenProbs)
|
|
.Literal = (.RepLencoder + .kNumLenProbs)
|
|
|
|
LZMA_BASE_SIZE = 1846 ; must be ==Literal
|
|
LZMA_LIT_SIZE = 768
|
|
|
|
.kNumTopBits = 24
|
|
.kTopValue = (1 shl .kNumTopBits)
|
|
|
|
.kNumBitModelTotalBits = 11
|
|
.kBitModelTotal = (1 shl .kNumBitModelTotalBits)
|
|
.kNumMoveBits = 5
|
|
|
|
; variables
|
|
.continue dd ?
|
|
.ecx dd ?
|
|
.outEnd dd ?
|
|
.dictSize dd ?
|
|
.state dd ?
|
|
.rep0 dd ?
|
|
.rep1 dd ?
|
|
.rep2 dd ?
|
|
.rep3 dd ?
|
|
.p rd LZMA_BASE_SIZE
|
|
.basesize = $
|
|
; rd LZMA_LIT_SIZE shl (.lc+.lp)
|
|
end virtual
|
|
|
|
.fillBuf:
|
|
mov ebp, eax
|
|
mov ebx, [ebp+.state]
|
|
jecxz .nodata
|
|
add ecx, edi
|
|
mov [ebp+.outEnd], ecx
|
|
mov esi, [ebp+.inPtr]
|
|
jmp [ebp+.continue]
|
|
.nodata:
|
|
popad
|
|
ret
|
|
.start:
|
|
mov eax, [ebp+.inStream]
|
|
call fillBuf
|
|
mov esi, [eax+streamInfo.bufPtr]
|
|
mov eax, [eax+streamInfo.bufDataLen]
|
|
sub eax, 5
|
|
jb return.err
|
|
mov [ebp+.inLen], eax
|
|
inc esi
|
|
lodsd
|
|
bswap eax
|
|
mov [ebp+.code], eax
|
|
or [ebp+.range], -1
|
|
.main_loop:
|
|
cmp edi, [ebp+.outEnd]
|
|
jae .main_loop_done
|
|
mov edx, edi
|
|
and edx, [ebp+.posStateMask]
|
|
mov eax, ebx
|
|
shl eax, .kNumPosBitsMax
|
|
add eax, edx
|
|
lea eax, [ebp + .p + .IsMatch*4 + eax*4]
|
|
call .RangeDecoderBitDecode
|
|
jc .1
|
|
movzx eax, [ebp+.previousByte]
|
|
mov ah, dl
|
|
and ah, byte [ebp+.literalPosMask]
|
|
mov cl, 8
|
|
sub cl, [ebp+.lc]
|
|
shr eax, cl
|
|
imul eax, LZMA_LIT_SIZE*4
|
|
lea eax, [ebp + eax + .p+.Literal*4]
|
|
cmp ebx, .kNumLitStates
|
|
jb .literal
|
|
xor edx, edx
|
|
sub edx, [ebp+.rep0]
|
|
mov dl, [edi + edx]
|
|
call .LzmaLiteralDecodeMatch
|
|
jmp @f
|
|
.literal:
|
|
call .LzmaLiteralDecode
|
|
@@:
|
|
mov [ebp+.previousByte], al
|
|
stosb
|
|
mov al, bl
|
|
cmp bl, 4
|
|
jb @f
|
|
mov al, 3
|
|
cmp bl, 10
|
|
jb @f
|
|
mov al, 6
|
|
@@: sub bl, al
|
|
jmp .main_loop
|
|
.1:
|
|
lea eax, [ebp + .p + .IsRep*4 + ebx*4]
|
|
call .RangeDecoderBitDecode
|
|
jnc .10
|
|
lea eax, [ebp + .p + .IsRepG0*4 + ebx*4]
|
|
call .RangeDecoderBitDecode
|
|
jc .111
|
|
mov eax, ebx
|
|
shl eax, .kNumPosBitsMax
|
|
add eax, edx
|
|
lea eax, [ebp + .p + .IsRep0Long*4 + eax*4]
|
|
call .RangeDecoderBitDecode
|
|
jc .1101
|
|
cmp bl, 7
|
|
setae bl
|
|
lea ebx, [9 + ebx + ebx]
|
|
xor edx, edx
|
|
sub edx, [ebp+.rep0]
|
|
mov al, [edi + edx]
|
|
stosb
|
|
mov [ebp+.previousByte], al
|
|
jmp .main_loop
|
|
.111:
|
|
lea eax, [ebp + .p + .IsRepG1*4 + ebx*4]
|
|
call .RangeDecoderBitDecode
|
|
mov eax, [ebp+.rep1]
|
|
jnc .l3
|
|
.l1:
|
|
lea eax, [ebp + .p + .IsRepG2*4 + ebx*4]
|
|
call .RangeDecoderBitDecode
|
|
mov eax, [ebp+.rep2]
|
|
jnc .l2
|
|
xchg [ebp+.rep3], eax
|
|
.l2:
|
|
push [ebp+.rep1]
|
|
pop [ebp+.rep2]
|
|
.l3:
|
|
xchg eax, [ebp+.rep0]
|
|
mov [ebp+.rep1], eax
|
|
.1101:
|
|
lea eax, [ebp + .p + .RepLencoder*4]
|
|
call .LzmaLenDecode
|
|
cmp bl, 7
|
|
setc bl
|
|
adc bl, bl
|
|
xor bl, 3
|
|
add bl, 8
|
|
jmp .repmovsb
|
|
.10:
|
|
mov eax, [ebp+.rep0]
|
|
xchg eax, [ebp+.rep1]
|
|
xchg eax, [ebp+.rep2]
|
|
xchg eax, [ebp+.rep3]
|
|
cmp bl, 7
|
|
setc bl
|
|
adc bl, bl
|
|
xor bl, 3
|
|
add bl, 7
|
|
lea eax, [ebp + .p + .Lencoder*4]
|
|
call .LzmaLenDecode
|
|
mov eax, .kNumLenToPosStates-1
|
|
cmp eax, ecx
|
|
jb @f
|
|
mov eax, ecx
|
|
@@:
|
|
push ecx
|
|
mov ecx, .kNumPosSlotBits
|
|
shl eax, cl
|
|
lea eax, [ebp + .p+.PosSlot*4 + eax*4]
|
|
call .RangeDecoderBitTreeDecode
|
|
mov [ebp+.rep0], ecx
|
|
cmp ecx, .kStartPosModelIndex
|
|
jb .l6
|
|
push ecx
|
|
mov eax, ecx
|
|
and eax, 1
|
|
shr ecx, 1
|
|
or eax, 2
|
|
dec ecx
|
|
shl eax, cl
|
|
mov [ebp+.rep0], eax
|
|
pop edx
|
|
cmp edx, .kEndPosModelIndex
|
|
jae .l5
|
|
sub eax, edx
|
|
lea eax, [ebp + .p + (.SpecPos - 1)*4 + eax*4]
|
|
call .RangeDecoderReverseBitTreeDecode
|
|
add [ebp+.rep0], ecx
|
|
jmp .l6
|
|
.l5:
|
|
sub ecx, .kNumAlignBits
|
|
call .RangeDecoderDecodeDirectBits
|
|
mov ecx, .kNumAlignBits
|
|
shl eax, cl
|
|
add [ebp+.rep0], eax
|
|
lea eax, [ebp+.p+.Align_*4]
|
|
call .RangeDecoderReverseBitTreeDecode
|
|
add [ebp+.rep0], ecx
|
|
.l6:
|
|
pop ecx
|
|
inc [ebp+.rep0]
|
|
jz .main_loop_done
|
|
.repmovsb:
|
|
add ecx, .kMatchMinLen
|
|
.repmovsbz:
|
|
push esi
|
|
.repmovsbr:
|
|
mov eax, [ebp+.rep0]
|
|
cmp eax, [ebp+.dictSize]
|
|
jae return.err
|
|
mov esi, edi
|
|
sub esi, eax
|
|
mov eax, [ebp+streamInfo.bufPtr]
|
|
sub eax, esi
|
|
ja .repmovsb0
|
|
mov eax, [ebp+.outEnd]
|
|
sub eax, edi
|
|
push ecx
|
|
cmp ecx, eax
|
|
jb @f
|
|
mov ecx, eax
|
|
@@:
|
|
sub [esp], ecx
|
|
rep movsb
|
|
pop ecx
|
|
jz .repmovsb1
|
|
pop [ebp+.inPtr]
|
|
mov [ebp+.state], ebx
|
|
mov [ebp+.ecx], ecx
|
|
mov [ebp+.continue], .restart_repmovsb
|
|
popad
|
|
ret
|
|
.repmovsb0:
|
|
mov edx, [ebp+.dictSize]
|
|
cmp edx, [ebp+streamInfo.bufSize]
|
|
jnz return.err
|
|
add esi, edx
|
|
push ecx
|
|
cmp ecx, eax
|
|
jb @f
|
|
mov ecx, eax
|
|
@@:
|
|
mov eax, [ebp+.outEnd]
|
|
sub eax, edi
|
|
cmp ecx, eax
|
|
jb @f
|
|
mov ecx, eax
|
|
@@:
|
|
sub [esp], ecx
|
|
rep movsb
|
|
pop ecx
|
|
jnz .repmovsbr
|
|
.repmovsb1:
|
|
pop esi
|
|
mov al, [edi-1]
|
|
mov [ebp+.previousByte], al
|
|
jmp .main_loop
|
|
.main_loop_done:
|
|
mov [ebp+.state], ebx
|
|
mov [ebp+.continue], .main_loop
|
|
mov [ebp+.inPtr], esi
|
|
popad
|
|
ret
|
|
.restart_repmovsb:
|
|
mov ecx, [ebp+.ecx]
|
|
jmp .repmovsbz
|
|
|
|
.RangeDecoderBitDecode:
|
|
; in: eax->prob
|
|
; out: CF=bit; destroys eax
|
|
push edx
|
|
mov edx, [ebp+.range]
|
|
shr edx, .kNumBitModelTotalBits
|
|
imul edx, [eax]
|
|
cmp [ebp+.code], edx
|
|
jae .ae
|
|
mov [ebp+.range], edx
|
|
mov edx, .kBitModelTotal
|
|
sub edx, [eax]
|
|
shr edx, .kNumMoveBits
|
|
add [eax], edx
|
|
clc
|
|
.n:
|
|
lahf
|
|
cmp [ebp+.range], .kTopValue
|
|
jae @f
|
|
shl [ebp+.range], 8
|
|
shl [ebp+.code], 8
|
|
sub [ebp+.inLen], 1
|
|
js .refill1
|
|
.refilled1:
|
|
lodsb
|
|
mov byte [ebp+.code], al
|
|
@@:
|
|
sahf
|
|
pop edx
|
|
ret
|
|
.ae:
|
|
sub [ebp+.range], edx
|
|
sub [ebp+.code], edx
|
|
mov edx, [eax]
|
|
shr edx, .kNumMoveBits
|
|
sub [eax], edx
|
|
stc
|
|
jmp .n
|
|
|
|
.refill1:
|
|
push eax
|
|
call .refill
|
|
pop eax
|
|
jmp .refilled1
|
|
|
|
.refill:
|
|
mov eax, [ebp+.inStream]
|
|
cmp dword [eax+streamInfo.fullSize+4], 0
|
|
jnz @f
|
|
cmp dword [eax+streamInfo.fullSize], 0
|
|
jz return.err
|
|
@@:
|
|
call fillBuf
|
|
mov esi, [eax+streamInfo.bufPtr]
|
|
mov eax, [eax+streamInfo.bufDataLen]
|
|
dec eax
|
|
js return.err
|
|
mov [ebp+.inLen], eax
|
|
ret
|
|
|
|
.refill2:
|
|
call .refill
|
|
jmp .refilled2
|
|
|
|
.RangeDecoderDecodeDirectBits:
|
|
; in: ecx=numTotalBits
|
|
; out: eax=result; destroys edx
|
|
xor eax, eax
|
|
.l:
|
|
shr [ebp+.range], 1
|
|
shl eax, 1
|
|
mov edx, [ebp+.code]
|
|
sub edx, [ebp+.range]
|
|
jb @f
|
|
mov [ebp+.code], edx
|
|
or eax, 1
|
|
@@:
|
|
cmp [ebp+.range], .kTopValue
|
|
jae @f
|
|
shl [ebp+.range], 8
|
|
shl [ebp+.code], 8
|
|
push eax
|
|
dec [ebp+.inLen]
|
|
js .refill2
|
|
.refilled2:
|
|
lodsb
|
|
mov byte [ebp+.code], al
|
|
pop eax
|
|
@@:
|
|
loop .l
|
|
ret
|
|
|
|
.LzmaLiteralDecode:
|
|
; in: eax->probs
|
|
; out: al=byte; destroys edx
|
|
push ecx
|
|
mov ecx, 1
|
|
@@:
|
|
push eax
|
|
lea eax, [eax+ecx*4]
|
|
call .RangeDecoderBitDecode
|
|
pop eax
|
|
adc cl, cl
|
|
jnc @b
|
|
.LzmaLiteralDecode.ret:
|
|
mov al, cl
|
|
pop ecx
|
|
ret
|
|
.LzmaLiteralDecodeMatch:
|
|
; in: eax->probs, dl=matchByte
|
|
; out: al=byte; destroys edx
|
|
push ecx
|
|
mov ecx, 1
|
|
.LzmaLiteralDecodeMatch.1:
|
|
add dl, dl
|
|
setc ch
|
|
push eax
|
|
lea eax, [eax+ecx*4+0x100*4]
|
|
call .RangeDecoderBitDecode
|
|
pop eax
|
|
adc cl, cl
|
|
jc .LzmaLiteralDecode.ret
|
|
xor ch, cl
|
|
test ch, 1
|
|
mov ch, 0
|
|
jnz @b
|
|
jmp .LzmaLiteralDecodeMatch.1
|
|
|
|
.LzmaLenDecode:
|
|
; in: eax->prob, edx=posState
|
|
; out: ecx=len
|
|
push eax
|
|
add eax, .LenChoice*4
|
|
call .RangeDecoderBitDecode
|
|
pop eax
|
|
jnc .0
|
|
push eax
|
|
add eax, .LenChoice2*4
|
|
call .RangeDecoderBitDecode
|
|
pop eax
|
|
jc @f
|
|
mov ecx, .kLenNumMidBits
|
|
shl edx, cl
|
|
lea eax, [eax + .LenMid*4 + edx*4]
|
|
call .RangeDecoderBitTreeDecode
|
|
add ecx, .kLenNumLowSymbols
|
|
ret
|
|
@@:
|
|
add eax, .LenHigh*4
|
|
mov ecx, .kLenNumHighBits
|
|
call .RangeDecoderBitTreeDecode
|
|
add ecx, .kLenNumLowSymbols + .kLenNumMidSymbols
|
|
ret
|
|
.0:
|
|
mov ecx, .kLenNumLowBits
|
|
shl edx, cl
|
|
lea eax, [eax + .LenLow*4 + edx*4]
|
|
.RangeDecoderBitTreeDecode:
|
|
; in: eax->probs,ecx=numLevels
|
|
; out: ecx=length; destroys edx
|
|
push ebx
|
|
mov edx, 1
|
|
mov ebx, edx
|
|
@@:
|
|
push eax
|
|
lea eax, [eax+edx*4]
|
|
call .RangeDecoderBitDecode
|
|
pop eax
|
|
adc dl, dl
|
|
add bl, bl
|
|
loop @b
|
|
sub dl, bl
|
|
pop ebx
|
|
mov ecx, edx
|
|
ret
|
|
.RangeDecoderReverseBitTreeDecode:
|
|
; in: eax->probs,ecx=numLevels
|
|
; out: ecx=length; destroys edx
|
|
push ebx ecx
|
|
mov edx, 1
|
|
xor ebx, ebx
|
|
@@:
|
|
push eax
|
|
lea eax, [eax+edx*4]
|
|
call .RangeDecoderBitDecode
|
|
lahf
|
|
adc edx, edx
|
|
sahf
|
|
rcr ebx, 1
|
|
pop eax
|
|
loop @b
|
|
pop ecx
|
|
rol ebx, cl
|
|
mov ecx, ebx
|
|
pop ebx
|
|
ret
|
|
|
|
; LZMA parameters:
|
|
; db lc + 9 * (lp + 5 * pb)
|
|
; dd dictionarySize
|
|
|
|
lzma_get_buf_size:
|
|
cmp dword [esi-4], 5
|
|
jb return.err
|
|
push ecx
|
|
lodsb
|
|
aam 9
|
|
mov cl, al
|
|
mov al, ah
|
|
aam 5
|
|
add cl, al
|
|
mov eax, LZMA_LIT_SIZE
|
|
shl eax, cl
|
|
lea eax, [lzma_decoder.basesize+eax*4]
|
|
pop ecx
|
|
mov edx, [esi]
|
|
ret
|
|
|
|
lzma_init_decoder:
|
|
lodsb
|
|
aam 9
|
|
mov [ebp+lzma_decoder.lc], al
|
|
mov al, ah
|
|
aam 5
|
|
mov [ebp+lzma_decoder.lp], al
|
|
mov [ebp+lzma_decoder.pb], ah
|
|
cmp ah, lzma_decoder.kNumPosBitsMax
|
|
ja return.err
|
|
mov cl, ah
|
|
lodsd
|
|
mov [ebp+lzma_decoder.dictSize], eax
|
|
push 1
|
|
pop eax
|
|
shl eax, cl
|
|
dec eax
|
|
mov [ebp+lzma_decoder.posStateMask], eax
|
|
mov cl, [ebp+lzma_decoder.lp]
|
|
push 1
|
|
pop eax
|
|
shl eax, cl
|
|
dec eax
|
|
mov [ebp+lzma_decoder.literalPosMask], eax
|
|
mov [ebp+streamInfo.fillBuf], lzma_decoder.fillBuf
|
|
mov [ebp+lzma_decoder.continue], lzma_decoder.start
|
|
xor eax, eax
|
|
mov [ebp+lzma_decoder.previousByte], al
|
|
mov [ebp+lzma_decoder.state], eax
|
|
inc eax
|
|
lea edi, [ebp+lzma_decoder.rep0]
|
|
stosd
|
|
stosd
|
|
stosd
|
|
mov eax, LZMA_LIT_SIZE
|
|
mov cl, [ebp+lzma_decoder.lc]
|
|
add cl, [ebp+lzma_decoder.lp]
|
|
shl eax, cl
|
|
lea ecx, [eax+lzma_decoder.Literal]
|
|
mov eax, lzma_decoder.kBitModelTotal/2
|
|
lea edi, [ebp+lzma_decoder.p]
|
|
rep stosd
|
|
ret
|