/*?$Id:?checksum.cv?1.2?2001/01/02?08:06:00?roesch?Exp?$?*/
/*
**?Copyright?（C）?1998199920002001?Martin?Roesch?
**
**?This?program?is?free?software;?you?can?redistribute?it?and/or?modify
**?it?under?the?terms?of?the?GNU?General?Public?License?as?published?by
**?the?Free?Software?Foundation;?either?version?2?of?the?License?or
**?（at?your?option）?any?later?version.
**
**?This?program?is?distributed?in?the?hope?that?it?will?be?useful
**?but?WITHOUT?ANY?WARRANTY;?without?even?the?implied?warranty?of
**?MERCHANTABILITY?or?FITNESS?FOR?A?PARTICULAR?PURPOSE.??See?the
**?GNU?General?Public?License?for?more?details.
**
**?You?should?have?received?a?copy?of?the?GNU?General?Public?License
**?along?with?this?program;?if?not?write?to?the?Free?Software
**?Foundation?Inc.?59?Temple?Place?-?Suite?330?Boston?MA?02111-1307?USA.
*/

#include?“checksum.h“

/*
?*?Function:?checksum（u_int16_t?*?u_int32_t?u_int16_t?*?u_int32_t）
?*
?*?Purpose:?Huh?huh?math....
?*
?*?Arguments:?b1???=>?pointer?to?data?set?one
?*????????????len1?=>?length?of?data?set?one
?*????????????b2???=>?pointer?to?data?set?two
?*????????????len2?=>?length?of?data?set?two
?*
?*?Returns:?csum?=>?the?calculated?checksum?for?the?given?data
?*/
u_int16_t?checksum（u_int16_t?*b1?u_int32_t?len1?u_int16_t?*b2?u_int32_t?len2）
{
????u_int32_t?sum?=?0;

????if（b1?!=?（u_int16_t?*）NULL）?
????{
????????while（len1?>?1）?
????????{
????????????sum?+=?*（（u_int16_t?*）b1?++）;

????????????if（sum?&?0x80000000）
????????????{
????????????????sum?=?（sum?&?0xffff）?+?（sum?>>?16）;
????????????}

????????????len1?-=?2;
????????}
????
????????/*?we‘ll?have?problems?if?b2?exists?and?len1?is?odd?*/
????????if（len1）
????????{
???????????sum?+=?（u_int16_t）?*?（u_int8_t*）?b1;
????????}
????}

????if（b2?!=?（u_int16_t*）NULL）?
????{
????????while（len2?>?1）?
????????{
????????????sum?+=?*（（u_int16_t*）b2?++）;

????????????if（sum?&?0x80000000）
????????????{
????????????????sum?=?（sum?&?0xffff）?+?（sum?>>?16）;
????????????}

????????????len2?-=?2;
????????}

????????if（len2）
????????{
????????????sum?+=?（u_int16_t）?*?（u_int8_t*）?b2;
????????}
????}

????while（sum?>>?16）
????????sum?=?（sum?&?0xffff）?+?（sum?>>?16）;

????return?~sum;
}

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件????????269??2000-10-29?01:23??200622115475135\網絡入侵檢測系統\AUTHORS

?????文件???????3124??2000-11-20?00:41??200622115475135\網絡入侵檢測系統\backdoor-lib

?????文件???????1005??2001-01-18?05:40??200622115475135\網絡入侵檢測系統\BUGS

?????文件??????30111??2001-01-18?08:30??200622115475135\網絡入侵檢測系統\ChangeLog

?????文件?????109328??2001-01-30?20:53??200622115475135\網絡入侵檢測系統\configure

?????文件??????18329??2000-10-29?01:23??200622115475135\網絡入侵檢測系統\COPYING

?????文件???????6631??2000-08-30?20:46??200622115475135\網絡入侵檢測系統\contrib\create_mysql

?????文件???????5357??2001-01-03?21:26??200622115475135\網絡入侵檢測系統\contrib\create_oracle

?????文件???????5318??2000-08-30?20:46??200622115475135\網絡入侵檢測系統\contrib\create_postgresql

?????文件???????6830??2001-01-02?10:14??200622115475135\網絡入侵檢測系統\CREDITS

?????文件???????3881??2000-11-20?00:41??200622115475135\網絡入侵檢測系統\ddos-lib

????..AD...?????????0??2001-01-12?08:43??200622115475135\網絡入侵檢測系統\WIN32-Code\Debug

????..AD...?????????0??2001-01-17?08:23??200622115475135\網絡入侵檢測系統\WIN32-Includes\Debug

?????文件???????1236??2000-11-20?00:41??200622115475135\網絡入侵檢測系統\finger-lib

?????文件???????2298??2000-11-20?00:41??200622115475135\網絡入侵檢測系統\ftp-lib

?????文件??????13064??2001-01-02?17:35??200622115475135\網絡入侵檢測系統\INSTALL

?????文件???????5834??2000-10-29?01:23??200622115475135\網絡入侵檢測系統\install-sh

????..AD...?????????0??2001-01-19?08:03??200622115475135\網絡入侵檢測系統\WIN32-Prj\Installer?PRJ

????..AD...?????????0??2001-01-17?08:37??200622115475135\網絡入侵檢測系統\WIN32-Includes\libnet

????..AD...?????????0??2001-01-17?08:25??200622115475135\網絡入侵檢測系統\WIN32-Libraries\libnet

?????文件??????18329??2001-01-02?01:37??200622115475135\網絡入侵檢測系統\LICENSE

?????文件??????35252??2001-01-19?06:54??200622115475135\網絡入侵檢測系統\WIN32-Prj\Makefile

?????文件???????6232??2000-11-20?00:41??200622115475135\網絡入侵檢測系統\misc-lib

?????文件???????6462??2000-10-29?01:23??200622115475135\網絡入侵檢測系統\missing

?????文件????????773??2000-10-29?01:23??200622115475135\網絡入侵檢測系統\mkinstalldirs

????..AD...?????????0??2001-01-17?07:37??200622115475135\網絡入侵檢測系統\WIN32-Includes\mysql

????..AD...?????????0??2001-01-17?07:36??200622115475135\網絡入侵檢測系統\WIN32-Libraries\mysql

????..AD...?????????0??2001-01-11?09:21??200622115475135\網絡入侵檢測系統\WIN32-Includes\NET

?????文件???????1255??2000-11-20?00:41??200622115475135\網絡入侵檢測系統\netbios-lib

????..AD...?????????0??2001-01-11?09:21??200622115475135\網絡入侵檢測系統\WIN32-Includes\NETINET

............此處省略245個文件信息