PNG Loves EXIF

Hi. I'm Dustin.

I just created an reader/writer EXIF library for Go (go-exif
<https://github.com/dsoprea/go-exif>) and a command-line wrapper (
go-exif-knife <https://github.com/dsoprea/go-exif-knife>). Both the library
and command-line tool support thumbnails, GPS, JSON-formatting, writing
tags, etc.. . It's licensed as MIT.

With some guidance from Cosmin, his EXIF PoC, and a look through the libpng
implementation, *go-exif-knife* has first-class support for PNG (which uses
go-png-image-structure <https://github.com/dsoprea/go-png-image-structure>).

Example usage:

$ ./go-exif-knife write --filepath image.png --set-tag=ifd0,Make,testing
--output-filepath /tmp/updated.png

$ ./go-exif-knife read --filepath /tmp/updated.png
 IFD: Ifd<ID=(0) PARENT-IFD=[] IFD=[IFD] INDEX=(0) COUNT=(1) OFF=(0x0008)
CHILDREN=(0) PARENT=(0x0000) NEXT-IFD=(0x0000)>
 - TAG: IfdTagEntry<TAG-IFD=[] TAG-ID=(0x010f) TAG-TYPE=[ASCII]
UNIT-COUNT=(8)> NAME=[Make] VALUE=[testing]


The constellation of projects is fully configured for CI and there is a
complete set of cross-compiled binaries for *go-exif-knife* here:

https://github.com/dsoprea/go-exif-knife/releases


As of this point, it meets a minimum expectation of usability for the
average user, with the exception of parsing MakerNote data. This would
require months more of additional work (a task reserved for the future).
Additional support and unit-tests will be forthcoming.

I'd love to hear comments/critiques.



Dustin

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