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计算校验和
校验和算法描述：为保证网络上传输的数据的可靠性，在许多协议中都设置了校验和项，例如：IPv4、ICMPv4、IGMPV4、ICMPv6、UDP...
计算校验和
校验和算法描述：为保证网络上传输的数据的可靠性，在许多协议中都设置了校验和项，例如：IPv4、ICMPv4、IGMPV4、ICMPv6、UDP和TCP 等等。计算这些校验和的算法称为网际校验和算法，简单来说就是：把被校验的数据１６位进行累加，然后取反码，若数据字节长度为奇数，则数据尾部补一个字节的０以凑成偶数。
由于从输入文件读入的数据不能直接满足计算校验和的条件，所以首先对从文件读入缓冲区的数据进行预处理，即读入缓冲区时忽略空格。由于累加是按16位进行的，所以每次从缓冲区中读出4个字符，并将字符转换成对应的16进制数字，如此依次累加，直至数据全部读完。
还有一种情况，即如果数据长度为奇数个字节，则需要判断，并补0累加。程序中利用的是缓冲区长度计数器i和当前读取到计数器j判断数据长度是否为奇数。即如果数据长度为偶数，则读完数据时当前读取到计数器j的值应与缓冲区长度i相等，而如果数据长度为奇数，则读完数据时，当前读取到计数器j>缓冲区长度i，此时需将缓冲区中剩余的两个字符读出，并补0，转换成相应16进制数以后参与累加。
当累加结束后，将累加和的16位以上数据位移下再进行一次累加，并对最后累加和取反即得所求校验和。
-calculated checksum checksum algorithm Description : To ensure the network transmission of data reliability, in many of the agreements are set up and calibration, for example : IPv4, ICMPv4, IGMPV4, ICMPv6. UDP and TCP so on. Calculating checksum algorithm called the Internet checksum algorithm, the simple answer is : as has been the calibration data for 16 cumulative, and then take the anti-code, if the data byte length of the odd, data will make up the tai
- 2022-01-26 06:39:03下载
- 积分：1
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一个自动投票的工具，需要改变投票的网络地址才能使用
一个自动投票的工具，需要改变投票的网络地址才能使用-an automated voting tools, the need to change the voting can use Network Address
- 2022-08-12 07:52:58下载
- 积分：1
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此源文件问本人参考Jrtplib的example1写的一个集服务器和客户端为一体的源文件，需要用到jrtplib3.7，jthreadlib1.2,调试时，请选...
此源文件问本人参考Jrtplib的example1写的一个集服务器和客户端为一体的源文件，需要用到jrtplib3.7，jthreadlib1.2,调试时，请选择vc++6.0的debug multithread dll选项调试，其中testResult.txt为本人测试结果，源码中解释详尽，希望对大家有用-I asked the source of reference Jrtplib set example1 to write a server and client as one of the source files needed jrtplib3.7, jthreadlib1.2, debugging, select the vc++6.0 options debug multithread dll debugging , of which I testResult.txt for test results, source code explained in detail, in the hope that useful
- 2022-03-29 23:43:23下载
- 积分：1
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vnc桌面共享，开发环境vc++，希望大家多多研究。
vnc桌面共享，开发环境vc++，希望大家多多研究。-for desk share，devolepment enviroment is vc++.
- 2022-04-15 22:43:14下载
- 积分：1
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firefox系列，扩展编程之四，又一个简单例子。
firefox系列，扩展编程之四，又一个简单例子。-series, extended programming 4, a simple example.
- 2022-02-10 15:33:01下载
- 积分：1
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NETI@home is an open
NETI@home is an open-source software package, named after the widely popular http://setiathome.ssl.berkeley.edu/, that collects network performance statistics from end-systems. It has been written for and tested on the Windows, Linux, Mac OS X, and Solaris operating systems, with testing for other operating systems to be completed soon. NETI@home is designed to run on end-user machines and will collect various statistics about Internet performance. These statistics will then be sent to a server at the Georgia Institute of Technology (Georgia Tech), where they will be collected and made publicly available. We believe that this tool will give researchers much needed data on the end-to-end performance of the Internet, as measured by end-users. Our basic approach is to sniff packets sent to and received by the host and infer performance metrics based on these observed packets. NETI@home users are able to select a privacy level that will determine what types of data will be gathered, and wh
- 2023-09-09 23:40:03下载
- 积分：1
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this program demonstrated how to handle through the window from the desired comm...
本程序演示如何通过窗口句柄取webbrowser控件的IHtmlDocument2接口-this program demonstrated how to handle through the window from the desired command control interface IHtmlDocument2
- 2022-03-25 06:43:15下载
- 积分：1
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Tomcat帮助文档 Tomcathelp
配置
管理
基本使用
Tomcat帮助文档 Tomcathelp
配置
管理
基本使用-Tomcat Help Tomcathelp basic use of configuration management
- 2022-03-21 01:26:22下载
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Example of using PIPEs for consoles apps
Example of using PIPEs for consoles apps
- 2022-01-22 10:33:53下载
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使用Raw Socket抓取IP包 使用本程序后,可以监听到网络中的所有数据，只要稍微修改一下,网络中明文传输的“帐号...
使用Raw Socket抓取IP包 使用本程序后,可以监听到网络中的所有数据，只要稍微修改一下,网络中明文传输的“帐号-密码”就都呈现在你眼前了!-Raw Socket crawling using IP packet using this procedure, you can listen to the network all the data, as long as the slightly changed a bit, specifically transmission network " account- the password" on both the front of your eyes now!
- 2023-04-04 14:30:03下载
- 积分：1
