[cvs] commit: framework/MIME MIME.php framework/MIME/MIME Part.php

[Michael M Slusarz]

Quoting Chuck Hagenbuch <chuck at horde.org>:

> Quoting Michael M Slusarz <slusarz at horde.org>:
>
>>  Log:
>>  A better random ID generator. Don't create boundary string until needed.
>
> If this is Horde 4/PHP 5 only, how about using Horde_Support_Uuid?

UUIDs are not preferable for several reasons:
1. They are overly long - for most MIME operations (i.e. boundaries,  
Message-IDs), the IDs only need to be unique within each message or,  
in the case of Message-IDs, unique on that particular system; since we  
later append system information to the random ID, there is no need for  
those message-ID random strings to be globally unique.  We don't need  
a 36-character long string.
2. UUIDs waste a lot of space, important when the information will be  
in transport.  UUIDs are only in hex, so for each byte we are only  
using 16/127 of the possible ASCII values (well, less than 127 because  
some of those are control characters, but for sake of argument...).   
The MIME IDs use 36/127 so we can pack more unique randomness into a  
smaller string.  We theoretically could pack even more randomness by  
adding other printable characters ("!@#%^&", etc.) into the string,  
but for sake of ease of creation, 36 chars should be fine.

michael

-- 
___________________________________
Michael Slusarz [slusarz at horde.org]