Web文件分发协议 （Web File Distribution Protocol） ，缩写为WFDP。是 LOOPC Software Studio 创建的，用于在Internet上以“分布式”的方式发布巨大文件的规约方法。这里“分布式”的含义是发布者可以将“巨大文件”划分为不同的部分，并将这些不同部分在不同的URL上发布。WFDP协议将确保这种巨大文件可以被正确发布并能够被浏览者正确的获取。

What is WFDP?

The functions of WFDP(Faster Distribution Free Share)

WFDP Definition of Structure

What is WFDP?

Web File Distribution Protocol is independent Created by LOOPC Software Studio.

WFDP(Web File Distribution Protocol) is a file distribution protocol thatuploads or downloads large files through many different URLs ofwebsites. The core technology principle is that the publisher splitsthe specified large file into many sub-files, and then publishes allthe sub-files to any URLs address, in the meantime; the publisher needs generate the suffix “wfdp” file which contains basic description of thelarge file and the URL of each sub-file, offset of each sub-file, sizeof each sub-file and so on. You can

The functions of WFDP

Faster Distribution

Thetraditional upload and download for web file is working in one server,in this case, the server will consume huge system resources and thespeed obviously becomes very slow in this time if many people upload ordownload the same file together at the same time. However, If we areUsing WFDP, the sub-files can be distributed to different servers andmake them provide the uploading and downloading services at one time,so that reducing the pressure on each server, achieving load balancing,and greatly increased the speed of uploading and downloading。

Free Share

Thepurpose of Internet is that interconnect networks and shareinformation, actually the vast Internet own huge free space, but thelarge part of which is not used enough. As ordinary Internet users,generally they have not their own servers, and there is always avariety of restrictions on the free space, so if you want collection,sharing large files there is no good alternative program. However, theWFDP sub-files can be packaged into any existing files, such as images,sounds, video, etc. and the sub-file size is very small, so that ifusing the WFDP, it can take full advantage a lot of idle resources ofthe Internet and makes everyone freely access or share large files eachother at high speed.

WFDP Definition of Structure

1WFDP file usually uses “Wfdp” as the file name suffix, the content isbased on UTF-8 encoded XML strings used to record the file name, filesize, Hash value of file, last modification date, publisher and thesub-file offset, sub-file size, Hash value of sub-file, sub-file URL,and this “wfdp” file can be used as an ordinary text editor to view andedit.

summary：

NetFile

FileName //the original file name

FileSize // the original file size

HashCode //the MD5 of the original file

LastModifyTime //the last update date of the original file

Description? //the description information of the original file, can be null

Publisher? //the publisher of the original file，can be null

SubFiles

SubFile+

Offset //the offset value of the sub-file from the original file

Size //the size of the sub-file

HashCode //the MD5 of the sub-file

URL //the URL of the sub-file

syntax：

<!ELEMENT NetFile (FileName,FileSize,HashCode,LastModifyTime,Description?,Publisher?,SubFiles)>

<!ELEMENT SubFiles (SubFile+)>

<!ELEMENT SubFile (Offset,Size,HashCode,URL)>

example：

<?xml version="1.0"?>

<NetFile>

<FileName> wfdp demo.rmvb</FileName>

<FileSize>1073741824</FileSize>

<HashCode>e96ace772f9649d78ab8322edeec4ac2</HashCode>

<LastModifyTime>2009-09-22T15:26:58.578125+08:00</LastModifyTime>

<Description>WFDP (Web File Distribution Protocol) is a file distribution protocolthat uploads or downloads large files through many different URLs ofwebsites...</Description>

<Publisher>LOOPC</Publisher>

<SubFiles>

<SubFile>

<Offset>0</Offset>

<Size>1048576</Size>

<HashCode>16ea9da7bfba4f0eb302b4b62b53dec9</HashCode>

<URL>URL 1</URL>

</SubFile>

<SubFile>

<Offset>1048576</Offset>

<Size>1048576</Size>

<HashCode>782e35905ea144118163baacbb1200b3</HashCode>

<URL>URL 2</URL>

</SubFile>

………..

<SubFile>

<Offset>1072693248</Offset>

<Size>1048576</Size>

<HashCode>9346810ff88344a4bd7a4309d40524f5</HashCode>

<URL>URL N</URL>

</SubFile>

</SubFiles>

</NetFile>