[ID3 Dev] synchsafe integers

[Ben Bennett]

On Mon, Sep 15, 2008 at 01:35:01PM +0530, Dhanraj Birader wrote:
>  If bit 7 is zero then keep it as it is.

No!  Otherwise you can not correctly convert back since multiple
synchsafe ints would map to the same number.


> On Sat, Sep 13, 2008 at 1:43 PM, Daniel Wechsler <daaaaaaniel at gmx.de> wrote:
> > 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]

Yes.  That is correct.

Before Conversion      After Conversion
--------------------   --------------------
0000 0000  1111 1111   0000 0001  0111 1111
0000 0001  0111 1111   0000 0010  0111 1111   

If you did not convert the second one, then you would be unable to
tell what '0000 0001  0111 1111' mapped to.

     	  Hope that helps.

     	  	      -ben

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