regex - Issue with as_hex() function in perl -

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i trying write code cidr ipv6.

basicall, getting cidr perfix in code , convert binary.

then using as_hex() function in bigint library, convert hexadecimal.

that works fine.

the problem when try hexadecimal inverted binary. how cant it, prints out white spaces.

prefix : 78

actual binary: 0b11111111111111111111111111111111111111111111111111111111111111111111111111111100000000000000000000000000000000000000000000000000

hex: ffff:ffff:ffff:ffff:fffc:0000:0000:0000

inverted binary: 0b00000000000000000000000000000000000000000000000000000000000000000000000000000011111111111111111111111111111111111111111111111111

hex: 3fff:ffff:ffff:f::::

any ideas????

i think need handle leading zeros, as_hex seems rid of default. using 2 binary sequences provided:

use math::bigint;  sub paddedhex {   ($binary) = @_;   $x = substr(math::bigint->new($binary)->as_hex(), 2, -1);   return sprintf("0x%032s\n", $x); }  @binaries = qw/ 0b11111111111111111111111111111111111111111111111111111111111111111111111111111100000000000000000000000000000000000000000000000000  0b00000000000000000000000000000000000000000000000000000000000000000000000000000011111111111111111111111111111111111111111111111111 /;  $binary (@binaries) {   print paddedhex($binary), "\n"; }

i got output:

0x0fffffffffffffffffffc00000000000  0x000000000000000000003fffffffffff

hopefully helps?


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