[libmicrohttpd] How MHD_VERSION works and how to get the "x.y.z-r" string from it?

[FERMIN GALAN MARQUEZ]

Hi,

 

The MHD_VERSION is defined as follows

 

/**

* Current version of the library.

* 0x01093001 = 1.9.30-1.

*/

#define MHD_VERSION 0x00097000

 

Thus, it seems that by blocks of two digits, each block defines one of the four digits of the usual x.y.z-r version number.

 

Thus, for instance in this case:

 

00 -> 0. ..

09 -> .. .9. ..

70 -> .. .70

00 -> ..-0

 

resulting in 0.9.70-0. So far so good.

 

However, what has surprised me is that the blocks are interpreted literary instead of hexadecimal (as 0x0 should mean). For instance 70 in hexadecimal is 112 (which would lead to 0.9.112-0 in this case).

 

I have two questions regarding this, please:

 

·         Why does it work this way? Maybe it’s obvious, but for me is a bit weird J

·         It seems there is no way of getting the “x.y.z-r” text string directly from the libmicrohttpd functions (please, tell me if I’m wrong… I could have missed some function for that provided by the library itself). It would be great if somebody hat has faced before the same problem could share the code snipped to get the “z.y.z-r” text string from the MHD_VERSION hex number :)

 

Thank you very much in advance!

 

Best regards,

 

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Fermín

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