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Re: Hex dump (was: Re^6: Geo Package files)

by pryrt (Abbot)
on Mar 11, 2022 at 20:49 UTC ( [id://11142010]=note: print w/replies, xml ) Need Help??


in reply to Hex dump (was: Re^6: Geo Package files)
in thread Geo Package files

At least the envelope on that one makes more sense.

<Reveal this spoiler or all in this thread>

I get a decoding of the first 8 bites plus envelope of: 

0x4750 v=0 f=00000101 srsid=27700
envelope#2 -> 6 elements, mode=little-endian => 'd<6'
339881.51, 340581.897, 442566.608999999, 443257.832, 0, 0

[download]
And the minx,miny are smaller than maxx,maxy -- so whether that's a good thing or not, I don't know.

The main takeaways of my input is that you need to use the < for litte-endian and > for big-endian, and that way you won't be guessing in the future whether your system and/or perl have native big- or little-endianness. (Also, even if you'll always be on the same processor, having those directions explicit in the code will make future development/maintenance so much easier.)

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