Re: Add 1 to an arbitrary-length binary string

Here's a guess ...

#!/usr/bin/perl

use strict; # https://www.perlmonks.org/?node_id=11155633
use warnings;

use Data::Dump 'dd';
for ( 'aa', "a\xff", 'frequency/is/measured/in/hertz' )
  {
  dd 'in', $_;
  my $onelarger = s/([^\xff])\xff*\z/ $1 =~ tr||\x01-\xff|cr /er;
  dd 'out', $onelarger;
  }
[download]

Outputs:

("in", "aa")
("out", "ab")
("in", "a\xFF")
("out", "b")
("in", "frequency/is/measured/in/hertz")
("out", "frequency/is/measured/in/hert{")
[download]

Comment on Re: Add 1 to an arbitrary-length binary string Select or Download Code

Replies are listed 'Best First'.
Re^2: Add 1 to an arbitrary-length binary string by ikegami (Patriarch) on Nov 16, 2023 at 01:56 UTC
61FF + 1 = 6200, not 62. (Second test)	[reply]
Re^3: Add 1 to an arbitrary-length binary string by tybalt89 (Monsignor) on Nov 16, 2023 at 02:35 UTC
That would be true if all strings were hex numbers, but "/Some/Arbitrarily/long/string" (see Re^2: Add 1 to an arbitrary-length binary string) doesn't look like a hex number to me... Shouldn't `"61FF" + 1 = "61FG"` ? If a set of test cases were provided, that could clarify the matter.	[reply] [d/l]
Re^4: Add 1 to an arbitrary-length binary string by syphilis (Archbishop) on Nov 16, 2023 at 06:53 UTC
Shouldn't "61FF" + 1 = "61FG" ? In short, the string "\x61\xFF" gets incremented to "\x62\x00" ... which seems a reasonable way to do it. Perhaps this is already clear (either implicitly or explicitly) from what others have provided to this thread. Cheers, Rob	[reply]
Re^4: Add 1 to an arbitrary-length binary string by ikegami (Patriarch) on Nov 16, 2023 at 05:36 UTC
I'm not talking about the string produced by `"61FF"` but the string produced by `"a\xFF"`, which is a weird and apparently confusing way of referring to the hex number 61FF.	[reply] [d/l] [select]
Re^3: Add 1 to an arbitrary-length binary string by einhverfr (Friar) on Nov 16, 2023 at 02:44 UTC
actually since this is a range bound, the truncation is fine	[reply]
Re^2: Add 1 to an arbitrary-length binary string by einhverfr (Friar) on Nov 16, 2023 at 02:24 UTC
Thank you so much. This certainly gets me started.	[reply]