;tset = rtp* rahc dengisnu ;i rahc dengisnu ;0 = crc tni dengisnu { ) diov (nia m diov ;61 = nel rahc dengisnu ;}ffx0,eex0,ddx0,ccx0,bbx0,aax0,99x0,88x0,77x0,66x0,55x0,44x0,33x0,22x0,11x0,00x0{= ]61[tset rahc dengisnu 。现实言 语 C 的后化简出给面下。白明要家大点这�的除被以可是也位一后最的列序到算直一�以所�的算运与参后位 61 移 左是列序制进二为因�点一调强还后最。或异即�算运法加的位进带不是也和之数余。了道知就下一算手动己自个这 。1201x0 是而,00001x0 为非并数余 �除 12011x0 被以可也 00001x0 以所 �算运法减的位借带不用采中法除式项多为因 �是的同不法除通普和点一有。余求数除除去再就�数除被当以可大较比果如�后 2 以乘数余的时位一上算计�法除 的单简作看它把�方比个打�说是就也�解理好很个这。数余得所算计位本上加再后然,算运余求作 12011x0 对可后 2 * 数余位一上�时位本算计�0 = ! )0008x0 & 数余的算计位一上 (即�时 1 为位 tib51 第数余的算计位一上中列序制 进二当�知可析分。化简的步一进作序程对们我�间空存内约节了为。解理易容很�来而析分算运据根序程的面上 } ;)crc," x%x0"(ftnirp ;pmet = crc } ;++rtp }
} ;)12011x0 ^ 00001x0( ^ pmet = p met { )0 =! )i & rtp*((fi } ;12011x0 ^ pmet = p met {
3
,4a44x0 ,7c47x0 ,6e46x0 ,1041x0 ,0240x0 ,3443x0 ,2642x0 ,ed3ex0 ,ff3fx0 ,c93cx0 ,db3dx0 ,a53ax0 ,b73bx0 ,8138x0 ,9339x0 ,6d26x0 ,7f27x0 ,4924x0 ,5b25x0 ,2522x0 ,3723 x0 ,0120x0 ,1321x0 ,fe1fx0 ,ec1ex0 ,da1dx0 ,c81cx0 ,b61bx0 ,a41ax0 ,9219x0 ,8018x0 ,7e07x0 ,6c06x0 ,5a05x0 ,4804x0 ,3603x0 ,2402x0 ,1201x0 ,0000x0 �下如表的成生。替代�)crc," ,x%x0"(ftnirp 用接直可�谓所无果如�齐整较比表的成生使 制控了为句语 ftnirp 个几的面后 。了以可就的他其成换 1201x0 中序程把需只 �式项多 12011x0 的用使是不你果如 )0 =! )i & j((fi } } } ;1 << crc = crc { esle } ;1201x0 ^ crc = crc ;1 << crc = crc { )0 = ! )0008x0 & crc((fi { )1 >> i = i ;0 =! i ;08x0 = i(rof ;0 = crc { )++j ;652 < j ;0 = j(rof ;)crc," ,x%"(ftnirp } ;)"0"(ftnirp { )0001x0 < crc(fi esle } ;)"00"(ftnirp { )001x0 < crc(fi esle } ;)"000"(ftnirp { )01x0 < crc(fi ;)"x0"c = crc { )0 =! )i & rtp*((fi } ;1 << crc = crc { esle } ;1201x0 ^ crc = crc ;1 << crc = crc { )0 = ! )0008x0 & crc((fi { )1 >> i = i ;0 =! i ;08x0 = i(rof { ) --nel (elihw
;1201x0 ^ crc = crc
;j tni dengisnu ;i rahc dengisnu ;0 = crc tni dengisnu { ) diov (niam diov
。序程算计的 12011x0 是式项多了出给序程的面下�的来出算计是然当�呢的到得么怎是表 。度速算计高提大大可法表查用采�中表个一在放�来出算计部全 CRC 的数列序制进二位 8 把们我�度速算计高提了 为。加相数余的得算计和数余为作后方次八的 2 以乘值的位八低�余求加相值位本与接直值的位八高�式形的位八低 和位八高成拆 CRC 的中算计将�程编化简了为。撒解理好该应个这�算运的步一下与参方次八的 2 以乘要 CRC 数 余的步一上中算计是的同不一唯�样一骤步的面上和时算计析分�)0 0 0 0(f900x0 + )0 0 0 0(00a9x0 为分拆可列序制 进二该上际实�)0 0 0 0(f9a9x0 为即�位 61 移左数列序制进二将�时 f9a9x0 即�时 1111 0101 0101 1001 为列序 制进二算计如例�时 CRC 算计节字当�子例的面前举是还。了 esac 小是就个这解理�识知的算计位按面上了有 CRC 算计节字按、3 。法方 的 CRC 算计速快表查节字按种一绍介再面下�算计去位一位一要但�少存内占所�单简较比码代 CRC 算计位按 。。。。。吗易容字 多么这码我�下看再头从是还�了不解理还是要。的解理易容较比是还�哈一味品细细�序程的前之化简没下一比对 以可�难困有还解理序程段此对果如�析分细详的面上我过通。释解的细详得冇但�见常为较上网序程段这面上 } ;)crc," x%x0"(ftnirp } ;++rtp }
4
;8H_crc rahc dengisnu ;0 = crc tni dengisnu { )diov(nia m diov ;}0fe1x0 ,1de0x0 ,2be3x0 ,39e2x0 ,47e5x0 ,55e4x0 ,63e7x0 ,71e6x0 ,8ff9x0 ,9df8x0 ,abfbx0 ,b9fax0 ,c7fdx0 ,d5fcx0 ,e3ffx0 ,f1fex0 ,1cc0x0 ,0ec1x0 ,38c2x0 ,2ac3x0 ,54c4x0 ,46c5x0 ,70c6x0 ,62c7x0 ,9cd8x0 ,8ed9x0 ,b8dax0 ,aadbx0 ,d4dcx0 ,c6ddx0 ,f0dex0 ,e2dfx0 ,29a3x0 ,3ba2x0 ,0da1x0 ,1fa0x0 ,61a7x0 ,73a6x0 ,45a5x0 ,57a4x0 ,a9bbx0 ,bbbax0 ,8db9x0 ,9fb8x0 ,e1bfx0 ,f3bex0 ,c5bdx0 ,d7bcx0 ,3a82x0 ,2883x0 ,1e80x0 ,0c81x0 ,7286x0 ,6087x0 ,5684x0 ,4485x0 ,ba9ax0 ,a89bx0 ,9e98x0 ,8c99x0 ,f29ex0 ,e09fx0 ,d69cx0 ,c49dx0 ,4365x0 ,5164x0 ,6767x0 ,7566x0 ,0b61x0 ,1960x0 ,2f63x0 ,3d62x0 ,c37dx0 ,d17cx0 ,e77fx0 ,f57ex0 ,8b79x0 ,9978x0 ,af7bx0 ,bd7ax0 ,5044x0 ,4245x0 ,7446x0 ,6647x0 ,1840x0 ,0a41x0 ,3c42x0 ,2e43x0 ,d05cx0 ,c25dx0 ,f45ex0 ,e65fx0 ,9858x0 ,8a59x0 ,bc5ax0 ,ae5bx0 ,6527x0 ,7726x0 ,4125x0 ,5324x0 ,2d23x0 ,3f22x0 ,0921x0 ,1b20x0 ,e53fx0 ,f73ex0 ,c13dx0 ,d33cx0 ,ad3bx0 ,bf3ax0 ,8939x0 ,9b38x0 ,7606x0 ,6407x0 ,5204x0 ,4005x0 ,3e02x0 ,2c03x0 ,1a00x0 ,0801x0 ,f61ex0 ,e41fx0 ,d21cx0 ,c01dx0 ,be1ax0 ,ac1bx0 ,9a18x0 ,8819x0 ,87f8x0 ,95f9x0 ,a3fax0 ,b1fbx0 ,cffcx0 ,ddfdx0 ,ebfex0 ,f9ffx0 ,07e0x0 ,15e1x0 ,23e2x0 ,31e3x0 ,4fe4x0 ,5de5x0 ,6be6x0 ,79e7x0 ,94d9x0 ,86d8x0 ,b0dbx0 ,a2dax0 ,dcddx0 ,cedcx0 ,f8dfx0 ,eadex0 ,14c1x0 ,06c0x0 ,30c3x0 ,22c2x0 ,5cc5x0 ,4ec4x0 ,78c7x0 ,6ac6x0 ,a1bax0 ,b3bbx0 ,85b8x0 ,97b9x0 ,e9bex0 ,fbbfx0 ,cdbcx0 ,dfbdx0 ,21a2x0 ,33a3x0 ,05a0x0 ,17a1x0 ,69a6x0 ,7ba7x0 ,4da4x0 ,5fa5x0 ,b29bx0 ,a09ax0 ,9699x0 ,8498x0 ,fa9fx0 ,e89ex0 ,de9dx0 ,cc9cx0 ,3283x0 ,2082x0 ,1681x0 ,0480x0 ,7a87x0 ,6886x0 ,5e85x0 ,4c84x0 ,cb7cx0 ,d97dx0 ,ef7ex0 ,fd7fx0 ,8378x0 ,9179x0 ,a77ax0 ,b57bx0 ,4b64x0 ,5965x0 ,6f66x0 ,7d67x0 ,0360x0 ,1161x0 ,2762x0 ,3563x0 ,d85dx0 ,ca5cx0 ,fc5fx0 ,ee5ex0 ,9059x0 ,8258x0 ,b45bx0 ,a65ax0 ,5845x0 ,4a44x0 ,7c47x0 ,6e46x0 ,1041x0 ,0240x0 ,3443x0 ,2642x0 ,ed3ex0 ,ff3fx0 ,c93cx0 ,db3dx0 ,a53ax0 ,b73bx0 ,8138x0 ,9339x0 ,6d26x0 ,7f27x0 ,4924x0 ,5b25x0 ,2522x0 ,3723x0 ,0120x0 ,1321x0 ,fe1fx0 ,ec1ex0 ,da1dx0 ,c81cx0 ,b61bx0 ,a41ax0 ,9219x0 ,8018x0 ,7e07x0 ,6c06x0 ,5a05x0 ,4804x0 ,3603x0 ,2402x0 ,1201x0 ,0000x0 {= ]652[elbat_crc tni dengisnu ;61 = nel rahc dengisnu ;}ffx0,eex0,ddx0,ccx0,bbx0,aax0,99x0,88x0,77x0,66x0,55x0,44x0,33x0,22x0,11x0,00x0{= ]61[tset rahc dengisnu �序程源的算计节字按写来们我�了好 ,0fe1x0 ,1de0x0 ,2be3x0 ,39e2x0 ,47e5x0 ,55e4x0 ,63e7x0 ,71e6x0 ,8ff9x0 ,9df8x0 ,abfbx0 ,b9fax0 ,c7fdx0 ,d5fc x0 ,e3ffx0 ,f1fex0 ,1cc0x0 ,0ec1x0 ,38c2x0 ,2ac3x0 ,54c4x0 ,46c5x0 ,70c6x0 ,62c7x0 ,9cd8x0 ,8ed9x0 ,b8dax0 ,aadbx0 ,d4dcx0 ,c6ddx0 ,f0dex0 ,e2dfx0 ,29a3x0 ,3ba2x0 ,0da1x0 ,1fa0x0 ,61a7x0 ,73a6x0 ,45a5x0 ,57a4x0 ,a9bbx0 ,bbbax0 ,8db9x0 ,9fb8x0 ,e1bfx0 ,f3bex0 ,c5bdx0 ,d7bcx0 ,3a82x0 ,2883x0 ,1e80x0 ,0c81x0 ,7286x0 ,6087x0 ,5684x0 ,4485x0 ,ba9ax0 ,a89bx0 ,9e98x0 ,8c99x0 ,f29ex0 ,e09fx0 ,d69cx0 ,c49dx0 ,4365x0 ,5164x0 ,6767x0 ,7566x0 ,0b61x0 ,1960x0 ,2f63x0 ,3d62x0 ,c37dx0 ,d17cx0 ,e77fx0 ,f57ex0 ,8b79x0 ,9978 x0 ,af7bx0 ,bd7ax0 ,5044x0 ,4245x0 ,7446x0 ,6647x0 ,1840x0 ,0a41x0 ,3c42x0 ,2e43x0 ,d05cx0 ,c25dx0 ,f45ex0 ,e65fx0 ,9858x0 ,8a59x0 ,bc5ax0 ,ae5bx0 ,6527x0 ,7726x0 ,4125x0 ,5324x0 ,2d23x0 ,3f22x0 ,0921x0 ,1b20x0 ,e53fx0 ,f73ex0 ,c13dx0 ,d33cx0 ,ad3bx0 ,bf3ax0 ,8939x0 ,9b38x0 ,7606x0 ,6407x0 ,5204x0 ,4005x0 ,3e02x0 ,2c03x0 ,1a00x0 ,0801x0 ,f61ex0 ,e41fx0 ,d21cx0 ,c01dx0 ,be1ax0 ,ac1bx0 ,9a18x0 ,8819x0 ,87f8x0 ,95f9x0 ,a3fax0 ,b1fbx0 ,cffcx0 ,ddfdx0 ,ebfex0 ,f9ffx0 ,07e0x0 ,15e1x0 ,23e2x0 ,31e3x0 ,4fe4x0 ,5de5 x0 ,6be6x0 ,79e7x0 ,94d9x0 ,86d8x0 ,b0dbx0 ,a2dax0 ,dcddx0 ,cedcx0 ,f8dfx0 ,eadex0 ,14c1x0 ,06c0x0 ,30c3x0 ,22c2x0 ,5cc5x0 ,4ec4x0 ,78c7x0 ,6ac6x0 ,a1bax0 ,b3bbx0 ,85b8x0 ,97b9x0 ,e9bex0 ,fbbfx0 ,cdbcx0 ,dfbdx0 ,21a2x0 ,33a3x0 ,05a0x0 ,17a1x0 ,69a6x0 ,7ba7 x0 ,4da4x0 ,5fa5x0 ,b29bx0 ,a09ax0 ,9699x0 ,8498x0 ,fa9fx0 ,e89ex0 ,de9dx0 ,cc9cx0 ,3283x0 ,2082x0 ,1681x0 ,0480x0 ,7a87x0 ,6886x0 ,5e85x0 ,4c84x0 ,cb7cx0 ,d97dx0 ,ef7ex0 ,fd7fx0 ,8378x0 ,9179x0 ,a77ax0 ,b57bx0 ,4b64x0 ,5965x0 ,6f66x0 ,7d67x0 ,0360x0 ,1161 x0 ,2762x0 ,3563x0 ,d85dx0 ,ca5cx0 ,fc5fx0 ,ee5ex0 ,9059x0 ,8258x0 ,b45bx0 ,a65ax0 ,5845x0