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Date: Tue, 27 Aug 2002 21:32:26 +0100 (IST)
From: Paul Jakma <paul@clubi.ie>
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To: David Neary <dneary@wanadoo.fr>
Cc: ILUG list <ilug@linux.ie>
Subject: Re: [ILUG] converting strings of hex to ascii
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On Tue, 27 Aug 2002, David Neary wrote:
> > Actually the following would be in some way sensible:
> > echo -e "`echo "$enc" | sed 's/%\([0-9a-fA-F]\{2,2\}\)/\\\x\1/g'`"
>
> Why {2,2}? Why not {2}?
no idea.
the above was something along the lines i was attempting, once i
realised it was a straight swap. but i couldnt get awk's gensub to
insert the \x for %'s and ='s.
anyway, in the end i found something on the internet and adapted it:
function decode_url (str, hextab,i,c,c1,c2,len,code) {
# hex to dec lookup table
hextab ["0"] = 0; hextab ["8"] = 8;
hextab ["1"] = 1; hextab ["9"] = 9;
hextab ["2"] = 2; hextab ["A"] = 10;
hextab ["3"] = 3; hextab ["B"] = 11;
hextab ["4"] = 4; hextab ["C"] = 12;
hextab ["5"] = 5; hextab ["D"] = 13;
hextab ["6"] = 6; hextab ["E"] = 14;
hextab ["7"] = 7; hextab ["F"] = 15;
decoded = "";
i = 1;
len = length (str);
while ( i <= len ) {
c = substr (str, i, 1);
# check for usual start of URI hex encoding chars
if ( c == "%" || c == "=" ) {
if ( i+2 <= len ) {
# valid hex encoding?
c1 = toupper(substr(str, i+1, 1));
c2 = toupper(substr(str, i+2, 1));
if ( !(hextab [c1] == "" && hextab [c2] == "") ) {
code = 0 + hextab [c1] * 16 + hextab [c2] + 0
c = sprintf ("%c", code)
i = i + 2
}
}
# + is space apparently
} else if ( c == "+" ) {
c = " "
}
decoded = decoded c;
++i;
}
return decoded
}
> Cheers,
> Dave.
> PS the late reply is because the footer on the original mail (If
> you received this mail in error yadda yadda) got caught in my
> spam filter, and ended up in my junkmail directory.
he he...
might not have been the footer - check my headers. :)
regards,
--
Paul Jakma paul@clubi.ie paul@jakma.org Key ID: 64A2FF6A
warning: do not ever send email to spam@dishone.st
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