[ID3 Dev] synchsafe integers

[Jim]

Daniel Wechsler wrote:
> Hello out there, I'm new here!
> 
> My question concerns the synchsafe integers, which were used for saving 
> the tag- and framesize.
> Bit 7 must always be 0, so 1111 1111 becomes 0000 0001  0111 1111.
> 
> But what is if bit 7 is already 0? Do I have to add a 0, too? [0000 
> 0001  0111 1111 -> 0000 0010  0111 1111]
> Or stays it like it is?
> 
> (I'm sorry for my bad english, I'm from Germany^^)
> Thank you, Daniel


Yes, you have it right.  In a synchsafe integer, only bits 0 thru 6 are used. 
You do need to shift that zero from bit 7 to bit 0 of the next byte.  Otherwise 
the synchsafe integer will not be properly decoded.



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