Re: CFD: eXIf 2017-05-31

Hi Cosmin,

> On Jun 8, 2017, at 10:33 PM, Cosmin Truta <[email protected]> wrote:
> 
> Add:
> + There are no size constraints upon the eXIf chunk size beyond those
> + imposed by the PNG specification, i.e. maximum 2^31-1 bytes. However,
> + applications may optionally impose a size constraint of maximum
> + 2^16-1 bytes, for easy interchange with the JPEG format.

Sounds good, except that since you are getting very specific about the
JPEG size constraint, the actual maximum size is 2^16-9 bytes because
you must leave space for the JPEG segment size word (2 bytes) and the
JPEG Exif00 header (neither of which are part of the eXIf chunk, but
both are included in the JPEG size word).

	- Phil

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