Re: DRAFT: eXIF 2017-03-05

good point!! here a suggestion



The first two bytes of data are either "II" for little endian or "MM" 
for big endian. Decoders should check the first four bytes to ensure 
that they have the following decimal values:
<pre>
     73, 73, 42, 0
</pre>
or
<pre>
     77, 77, 0, 42
</pre>"






On 2017-03-06 10:45, Cosmin Truta wrote:
> On 5 March 2017 at 09:47, Glenn Randers-Pehrson <[email protected]> wrote:
>> DRAFT
>> eXIf 2017-03-05
>> http://www.simplesystems.org/png-group/proposals/eXIf/
>> png-proposed-eXIf-chunk-03-05.html
>> Glenn Randers-Pehrson <[email protected]>
>
> Hi,
>
> The latest eXIf draft looks good. May I please suggest one small
> editorial (i.e. non-semantic) change: don't just check the endianness
> bytes; check the entire TIFF/EXIF "philosophical" signature instead.
>
> Instead of:
>
> "Decoders should check the first two bytes of data to ensure that they
> are "II" or "MM"."
>
> We can be more specific and say:
>
> "Decoders should check the first four bytes of data to ensure that
> they are "II\x2a\x00" or "MM\x00\x2a"."
>
> Or even be encoding-agnostic and say:
>
> "Decoders should check the first four bytes of data to ensure that
> they are "\x49\x49\x2a\x00" or "\x4d\x4d\x00\x2a"."
>
> Or use base 10 (as it is customary in the rest of the PNG
> specification) and say:
>
> "Decoders should check the first four bytes of data to ensure that
> they have the following decimal values:
> <pre>
>     73, 73, 42, 0
> </pre>
> or
> <pre>
>     77, 77, 0, 42
> </pre>"
>
> Sincerely,
> Cosmin
>
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-- 
Willem van Schaik
[email protected]

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