Re: pngexifinfo: PNG-EXIF info lister (Python code)

Just out of interest.  Did you run this code on the sample images I
previously posted, and if so, what was the result?

John Bowler

On Sun, Feb 5, 2017 at 7:32 PM, Cosmin Truta <[email protected]> wrote:
> Hi,
>
> I posted my current *draft* PNG-EXIF info lister at
> https://bitbucket.org/ctruta/pngexifinfo
>
> It can handle all of eXIf/exIf/zxIf, all of compressed or uncompressed
> streams (with automatic detection based on signature), with or without
> uncompressed-length field (also with automatic detection).
>
> The automatic compression detection is quick-and-dirty, but in theory
> works well. The code is otherwise written using clean, idiomatic,
> PEP8-style Python code.
>
> Should any of the current eXIf proposal pass, the code will be updated
> to match the approved proposal only, and the above-mentioned detection
> of compression (or lack of compression) will be removed.
>
> Here are a few metrics:
>
> Total lines of code: 177+248+54 = 479. This includes *everything*.
>
> The number of EXIF tags being recognized: 79. (I just stopped
> randomly, they became too many, and I don't have more time for that
> right now.) Each tag takes 1 LOC.
>
> The TIFF/EXIF parser and lister: 247 LOC. That includes the
> above-mentioned 79 enumerated tags.
>
> The PNG parser, simple, from-scratch: 177 LOC. That includes
> command-line parsing (incl. help screen), CRC checking, automatic
> detection of compression, execution of decompression (if needed), and
> error reporting.
>
> The EXIF extraction code out of PNG (both compressed and uncompressed,
> with and without uncompressed-length field): 21 LOC.
>
> The verification and error reporting of uncompressed-length field: 5
> LOC. (If this field would not have existed, this would have been 0
> LOC.)
>
> The decompression of deflate-encoded EXIF data: 1 LOC.
>
> Sincerely,
> Cosmin
>
> ------------------------------------------------------------------------------
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, SlashDot.org! http://sdm.link/slashdot
> _______________________________________________
> png-mng-misc mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/png-mng-misc



-- 
John Bowler <[email protected]>
+1 (541) 450-9885
PO BOX 3151
KERBY OR 97531-3151
USA

------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, SlashDot.org! http://sdm.link/slashdot