Technical References - [calcfilecrc32]

calculates the CRC32 value of a given file

[CalcFileCRC32 file=...]

Putting [CalcFileCRC32 file=...] in your template calculates the CRC32 value of a given file.

CRC32 is a 32-bit Cyclic Redundancy Check code, used mainly as an error detection method during data transmission. If the computed CRC bits are different from the original (transmitted) CRC bits, then there has been an error in the transmission. If they are identical, we can assume that no error occured (there is one chance in 4 billion that two different bit streams have the same CRC32). The idea is that the data bits are treated as a data polynomial and the CRC bits represent the remainder of the division of the data polynomial by a fixed, known polynomial (called the CRC polynomial).

Example:

[CalcFileCRC32 file=../header.inc]

Results:
4016676240l

From version 8.1, if you want to calculate the CRC32 of a string, you can use
[CalcCRC32][string][/CalcCRC32]

Example:

[text]stringX=balh blah blah blah[/text]
[CalcCRC32][stringX][/CalcCRC32]

This returns 345965317

DOWNLOAD WEBDNA NOW!

Top Articles:

Download WebDNA Applications

WebDNA applications...

WebDNA Libraries

A list of available libraries for WebDNA...

F.A.Q

A compilation of some user's questions...

WebDNA Modules

A list of the currently available modules...

Tips and Tricks

A list of user-submitted tips ...

Technical Change History

This Technical Change History provides a reverse chronological list of WebDNA changes...

Related Readings:

[regex]

[regex] is a full implementation of grep...

[deletefile]

Deleting a file from your website...

[authenticate]

WebDNA provides a few options for password protecting your pages...

[encrypt]

[encrypt] and [decrypt] allow you to store sensitive data in your databases without risk of exposing it to prying eyes...

[waitforfile]

The server waits until the file appears on disk...

[convertwords]

Changes specified words in a string of text to different words...