DeletedUser14087
I post too much
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Joined: 21 Jun 2006
Posts: 3069
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 Posted: Mon Jun 25, 2007 4:55 pm Post subject: ASM: CRC32 |
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Can anyone tell me whats this ?
| Code: |
.686
.model flat,stdcall
option casemap:none
.data
align 4
CRC32Table label dword
dd 000000000h,077073096h,0EE0E612Ch,0990951BAh,0076DC419h,0706AF48Fh,0E963A535h,09E6495A3h
dd 00EDB8832h,079DCB8A4h,0E0D5E91Eh,097D2D988h,009B64C2Bh,07EB17CBDh,0E7B82D07h,090BF1D91h
dd 01DB71064h,06AB020F2h,0F3B97148h,084BE41DEh,01ADAD47Dh,06DDDE4EBh,0F4D4B551h,083D385C7h
dd 0136C9856h,0646BA8C0h,0FD62F97Ah,08A65C9ECh,014015C4Fh,063066CD9h,0FA0F3D63h,08D080DF5h
dd 03B6E20C8h,04C69105Eh,0D56041E4h,0A2677172h,03C03E4D1h,04B04D447h,0D20D85FDh,0A50AB56Bh
dd 035B5A8FAh,042B2986Ch,0DBBBC9D6h,0ACBCF940h,032D86CE3h,045DF5C75h,0DCD60DCFh,0ABD13D59h
dd 026D930ACh,051DE003Ah,0C8D75180h,0BFD06116h,021B4F4B5h,056B3C423h,0CFBA9599h,0B8BDA50Fh
dd 02802B89Eh,05F058808h,0C60CD9B2h,0B10BE924h,02F6F7C87h,058684C11h,0C1611DABh,0B6662D3Dh
dd 076DC4190h,001DB7106h,098D220BCh,0EFD5102Ah,071B18589h,006B6B51Fh,09FBFE4A5h,0E8B8D433h
dd 07807C9A2h,00F00F934h,09609A88Eh,0E10E9818h,07F6A0DBBh,0086D3D2Dh,091646C97h,0E6635C01h
dd 06B6B51F4h,01C6C6162h,0815420D8h,0F262004Eh,06C0695EDh,01B01A57Bh,08208F4C1h,0F50FC457h
dd 065B0D9C6h,012B7E950h,08BBEB8EAh,0FCB9887Ch,062DD1DDFh,015DA2D49h,08CD37CF3h,0FBD44C65h
dd 04DB26158h,03AB551CEh,0A3BC0074h,0D4BB30E2h,04ADFA541h,03DD895D7h,0A4D1C46Dh,0D3D6F4FBh
dd 04369E96Ah,0346ED9FCh,0AD678846h,0DA60B8D0h,044042D73h,033031DE5h,0AA0A4C5Fh,0DD0D7CC9h
dd 05005713Ch,0270241AAh,0BE0B1010h,0C90C2086h,05768B525h,0206F85B3h,0B966D409h,0CE61E49Fh
dd 05EDEF90Eh,029D9C998h,0B0D09822h,0C7D7A8B4h,059B33D17h,02EB40D81h,0B7BD5C3Bh,0C0BA6CADh
dd 0EDB88320h,09ABFB3B6h,003B6E20Ch,074B1D29Ah,0EAD54739h,09DD277AFh,004DB2615h,073DC1683h
dd 0E3630B12h,094643B84h,00D6D6A3Eh,07A6A5AA8h,0E40ECF0Bh,09309FF9Dh,00A00AE27h,07D079EB1h
dd 0F00F9344h,08708A3D2h,01E01F268h,06906C2FEh,0F762575Dh,0806567CBh,0196C3671h,06E6B06E7h
dd 0FED41B76h,089D32BE0h,010DA7A5Ah,067DD4ACCh,0F9B9DF6Fh,08EBEEFF9h,017B7BE43h,060B08ED5h
dd 0D6D6A3E8h,0A1D1937Eh,038D8C2C4h,04FDFF252h,0D1BB67F1h,0A6BC5767h,03FB506DDh,048B2364Bh
dd 0D80D2BDAh,0AF0A1B4Ch,036034AF6h,041047A60h,0DF60EFC3h,0A867DF55h,0316E8EEFh,04669BE79h
dd 0CB61B38Ch,0BC66831Ah,0256FD2A0h,05268E236h,0CC0C7795h,0BB0B4703h,0220216B9h,05505262Fh
dd 0C5BA3BBEh,0B2BD0B28h,02BB45A92h,05CB36A04h,0C2D7FFA7h,0B5D0CF31h,02CD99E8Bh,05BDEAE1Dh
dd 09B64C2B0h,0EC63F226h,0756AA39Ch,0026D930Ah,09C0906A9h,0EB0E363Fh,072076785h,005005713h
dd 095BF4A82h,0E2B87A14h,07BB12BAEh,00CB61B38h,092D28E9Bh,0E5D5BE0Dh,07CDCEFB7h,00BDBDF21h
dd 086D3D2D4h,0F1D4E242h,068DDB3F8h,01FDA836Eh,081BE16CDh,0F6B9265Bh,06FB077E1h,018B74777h
dd 088085AE6h,0FF0F6A70h,066063BCAh,011010B5Ch,08F659EFFh,0F862AE69h,0616BFFD3h,0166CCF45h
dd 0A00AE278h,0D70DD2EEh,04E048354h,03903B3C2h,0A7672661h,0D06016F7h,04969474Dh,03E6E77DBh
dd 0AED16A4Ah,0D9D65ADCh,040DF0B66h,037D83BF0h,0A9BCAE53h,0DEBB9EC5h,047B2CF7Fh,030B5FFE9h
dd 0BDBDF21Ch,0CABAC28Ah,053B39330h,024B4A3A6h,0BAD03605h,0CDD70693h,054DE5729h,023D967BFh
dd 0B3667A2Eh,0C4614AB8h,05D681B02h,02A6F2B94h,0B40BBE37h,0C30C8EA1h,05A05DF1Bh,02D02EF8Dh
.code
align 4
CRC32 proc uses esi lpBuffer:DWORD,dwBufLen:DWORD,dwCRC:DWORD
mov eax,dwCRC
mov ecx,dwBufLen
xor eax,-1
test ecx,ecx
mov esi,lpBuffer
jz @F
.repeat
xor al,[esi]
movzx edx,al
shr eax,8
mov edx,[CRC32Table+edx*4]
inc esi
xor eax,edx
dec ecx
.until zero?
@@: xor eax,-1
ret
CRC32 endp
align 4
RCRC32 proc uses ebx esi edi pData:dword,dwDataLen:dword,dwOffset:dword,dwWantCrc:dword
mov esi,pData
invoke CRC32,esi,dwOffset,0
mov edx,dwDataLen
mov edi,esi
test edx,edx
mov ecx,dwWantCrc
jz @@Exit
add esi,edx
add edi,dwOffset
mov [edi],eax
xor ecx,-1
xor eax,eax
push ecx
mov edx,4
push eax
; rcrc32(@wantcrc,4)
.repeat
mov al,[esp+edx+3]
call @@GetTableEntry
xor [esp+edx],eax
xor [esp+edx-1],cl
dec edx
.until zero?
add edi,4
jmp @F
; rcrc32(pData+dwOffset+4,dwDataLen-dwOffset))
.repeat
mov eax,[esp]
sub esi,4
xor ecx,ecx
xor eax,[esi]
mov [esp],ecx
mov [esp+4],eax
mov edx,4
.repeat
mov al,[esp+edx+3]
call @@GetTableEntry
xor [esp+edx],eax
xor [esp+edx-1],cl
dec edx
.until zero?
@@:
.until esi <= edi
pop eax
xor eax,-1
xor [edi-4],eax; dwRCRC xor crc32(pData,dwOffset,0)
add esp,4
@@Exit:
ret
@@GetTableEntry:
xor ecx,ecx
.repeat
.break .if al == byte ptr [CRC32Table+ecx*4+3]
inc cl
.until zero?
mov eax,[CRC32Table+ecx*4]
retn
RCRC32 endp
end
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