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Monster Media 1994 #1
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CRC32.ASM
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Assembly Source File
|
1990-04-22
|
7KB
|
184 lines
page ,132
;
; Copyright 1987, 1989 Samuel H. Smith; All rights reserved
;
; This is a component of the ProDoor System.
; Do not distribute modified versions without my permission.
; Do not remove or alter this notice or any other copyright notice.
; If you use this in your own program you must distribute source code.
; Do not use any of this in a commercial product.
;
;
; CRC32 - Quick 32-bit crc calculation
; Used by CRC32 unit.
;
; Written by Samuel Smith, 03-20-89
;
code segment word public
assume cs:code
public crcstr
crctable label word
dd 000000000h, 077073096h, 0ee0e612ch, 0990951bah, 0076dc419h
dd 0706af48fh, 0e963a535h, 09e6495a3h, 00edb8832h, 079dcb8a4h
dd 0e0d5e91eh, 097d2d988h, 009b64c2bh, 07eb17cbdh, 0e7b82d07h
dd 090bf1d91h, 01db71064h, 06ab020f2h, 0f3b97148h, 084be41deh
dd 01adad47dh, 06ddde4ebh, 0f4d4b551h, 083d385c7h, 0136c9856h
dd 0646ba8c0h, 0fd62f97ah, 08a65c9ech, 014015c4fh, 063066cd9h
dd 0fa0f3d63h, 08d080df5h, 03b6e20c8h, 04c69105eh, 0d56041e4h
dd 0a2677172h, 03c03e4d1h, 04b04d447h, 0d20d85fdh, 0a50ab56bh
dd 035b5a8fah, 042b2986ch, 0dbbbc9d6h, 0acbcf940h, 032d86ce3h
dd 045df5c75h, 0dcd60dcfh, 0abd13d59h, 026d930ach, 051de003ah
dd 0c8d75180h, 0bfd06116h, 021b4f4b5h, 056b3c423h, 0cfba9599h
dd 0b8bda50fh, 02802b89eh, 05f058808h, 0c60cd9b2h, 0b10be924h
dd 02f6f7c87h, 058684c11h, 0c1611dabh, 0b6662d3dh, 076dc4190h
dd 001db7106h, 098d220bch, 0efd5102ah, 071b18589h, 006b6b51fh
dd 09fbfe4a5h, 0e8b8d433h, 07807c9a2h, 00f00f934h, 09609a88eh
dd 0e10e9818h, 07f6a0dbbh, 0086d3d2dh, 091646c97h, 0e6635c01h
dd 06b6b51f4h, 01c6c6162h, 0856530d8h, 0f262004eh, 06c0695edh
dd 01b01a57bh, 08208f4c1h, 0f50fc457h, 065b0d9c6h, 012b7e950h
dd 08bbeb8eah, 0fcb9887ch, 062dd1ddfh, 015da2d49h, 08cd37cf3h
dd 0fbd44c65h, 04db26158h, 03ab551ceh, 0a3bc0074h, 0d4bb30e2h
dd 04adfa541h, 03dd895d7h, 0a4d1c46dh, 0d3d6f4fbh, 04369e96ah
dd 0346ed9fch, 0ad678846h, 0da60b8d0h, 044042d73h, 033031de5h
dd 0aa0a4c5fh, 0dd0d7cc9h, 05005713ch, 0270241aah, 0be0b1010h
dd 0c90c2086h, 05768b525h, 0206f85b3h, 0b966d409h, 0ce61e49fh
dd 05edef90eh, 029d9c998h, 0b0d09822h, 0c7d7a8b4h, 059b33d17h
dd 02eb40d81h, 0b7bd5c3bh, 0c0ba6cadh, 0edb88320h, 09abfb3b6h
dd 003b6e20ch, 074b1d29ah, 0ead54739h, 09dd277afh, 004db2615h
dd 073dc1683h, 0e3630b12h, 094643b84h, 00d6d6a3eh, 07a6a5aa8h
dd 0e40ecf0bh, 09309ff9dh, 00a00ae27h, 07d079eb1h, 0f00f9344h
dd 08708a3d2h, 01e01f268h, 06906c2feh, 0f762575dh, 0806567cbh
dd 0196c3671h, 06e6b06e7h, 0fed41b76h, 089d32be0h, 010da7a5ah
dd 067dd4acch, 0f9b9df6fh, 08ebeeff9h, 017b7be43h, 060b08ed5h
dd 0d6d6a3e8h, 0a1d1937eh, 038d8c2c4h, 04fdff252h, 0d1bb67f1h
dd 0a6bc5767h, 03fb506ddh, 048b2364bh, 0d80d2bdah, 0af0a1b4ch
dd 036034af6h, 041047a60h, 0df60efc3h, 0a867df55h, 0316e8eefh
dd 04669be79h, 0cb61b38ch, 0bc66831ah, 0256fd2a0h, 05268e236h
dd 0cc0c7795h, 0bb0b4703h, 0220216b9h, 05505262fh, 0c5ba3bbeh
dd 0b2bd0b28h, 02bb45a92h, 05cb36a04h, 0c2d7ffa7h, 0b5d0cf31h
dd 02cd99e8bh, 05bdeae1dh, 09b64c2b0h, 0ec63f226h, 0756aa39ch
dd 0026d930ah, 09c0906a9h, 0eb0e363fh, 072076785h, 005005713h
dd 095bf4a82h, 0e2b87a14h, 07bb12baeh, 00cb61b38h, 092d28e9bh
dd 0e5d5be0dh, 07cdcefb7h, 00bdbdf21h, 086d3d2d4h, 0f1d4e242h
dd 068ddb3f8h, 01fda836eh, 081be16cdh, 0f6b9265bh, 06fb077e1h
dd 018b74777h, 088085ae6h, 0ff0f6a70h, 066063bcah, 011010b5ch
dd 08f659effh, 0f862ae69h, 0616bffd3h, 0166ccf45h, 0a00ae278h
dd 0d70dd2eeh, 04e048354h, 03903b3c2h, 0a7672661h, 0d06016f7h
dd 04969474dh, 03e6e77dbh, 0aed16a4ah, 0d9d65adch, 040df0b66h
dd 037d83bf0h, 0a9bcae53h, 0debb9ec5h, 047b2cf7fh, 030b5ffe9h
dd 0bdbdf21ch, 0cabac28ah, 053b39330h, 024b4a3a6h, 0bad03605h
dd 0cdd70693h, 054de5729h, 023d967bfh, 0b3667a2eh, 0c4614ab8h
dd 05d681b02h, 02a6f2b94h, 0b40bbe37h, 0c30c8ea1h, 05a05df1bh
dd 02d02ef8dh
; -------------------------------------------------------------
;
; procedure crcstr(var src;
; var crcout: longint;
; len: integer);
; {calculate crc-32 of a buffer}
;
; structure of stack frame --
srcptr equ dword ptr [bp+0ch] ;pointer to source buffer
crcptr equ dword ptr [bp+08h] ;pointer to crc_out
srclen equ word ptr [bp+06h] ;length of source buffer
crcstr proc far
push bp
mov bp,sp ;create stack frame
les si,crcptr
mov ax,es:[si]
mov dx,es:[si+2] ;dx:ax -> crcout
mov cx,srclen ;cx -> source length
les si,srcptr ;es:si -> source buffer
mov di,offset crctable ;cs:di -> crctable
crcNext:
mov bh,al ;save crcout & 0x000000ff
mov al,ah ;(crcout >> 8) & 0x00ffffff
mov ah,dl
mov dl,dh
xor dh,dh
mov bl,es:[si] ;*src++
inc si
xor bl,bh ;crcval & 0x000000ff
xor bh,bh
shl bx,1
shl bx,1
xor ax,cs:[di+bx]
xor dx,cs:[di+bx+2]
dec cx
jcxz crcDone
mov bh,al ;save crcout & 0x000000ff
mov al,ah ;(crcout >> 8) & 0x00ffffff
mov ah,dl
mov dl,dh
xor dh,dh
mov bl,es:[si] ;*src++
inc si
xor bl,bh ;crcval & 0x000000ff
xor bh,bh
shl bx,1
shl bx,1
xor ax,cs:[di+bx]
xor dx,cs:[di+bx+2]
dec cx
jcxz crcDone
mov bh,al ;save crcout & 0x000000ff
mov al,ah ;(crcout >> 8) & 0x00ffffff
mov ah,dl
mov dl,dh
xor dh,dh
mov bl,es:[si] ;*src++
inc si
xor bl,bh ;crcval & 0x000000ff
xor bh,bh
shl bx,1
shl bx,1
xor ax,cs:[di+bx]
xor dx,cs:[di+bx+2]
dec cx
jcxz crcDone
mov bh,al ;save crcout & 0x000000ff
mov al,ah ;(crcout >> 8) & 0x00ffffff
mov ah,dl
mov dl,dh
xor dh,dh
mov bl,es:[si] ;*src++
inc si
xor bl,bh ;crcval & 0x000000ff
xor bh,bh
shl bx,1
shl bx,1
xor ax,cs:[di+bx]
xor dx,cs:[di+bx+2]
loop crcNext
crcDone:
les si,crcptr
mov es:[si],ax
mov es:[si+2],dx
pop bp
ret 10 ;dispose of 10 parameter bytes
crcstr endp
code ends
end