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.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
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.\" ========================================================================
.\"
.IX Title "NetAddr::IP::UtilPP 3"
.TH NetAddr::IP::UtilPP 3 "2012-08-10" "perl v5.32.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
NetAddr::IP::UtilPP \-\- pure Perl functions for NetAddr::IP::Util
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 10
\& use NetAddr::IP::UtilPP qw(
\& hasbits
\& shiftleft
\& addconst
\& add128
\& sub128
\& notcontiguous
\& ipv4to6
\& mask4to6
\& ipanyto6
\& maskanyto6
\& ipv6to4
\& bin2bcd
\& bcd2bin
\& );
\&
\& use NetAddr::IP::UtilPP qw(:all)
\&
\& $rv = hasbits($bits128);
\& $bitsX2 = shiftleft($bits128,$n);
\& $carry = addconst($ipv6naddr,$signed_32con);
\& ($carry,$ipv6naddr)=addconst($ipv6naddr,$signed_32con);
\& $carry = add128($ipv6naddr1,$ipv6naddr2);
\& ($carry,$ipv6naddr)=add128($ipv6naddr1,$ipv6naddr2);
\& $carry = sub128($ipv6naddr1,$ipv6naddr2);
\& ($spurious,$cidr) = notcontiguous($mask128);
\& ($carry,$ipv6naddr)=sub128($ipv6naddr1,$ipv6naddr2);
\& $ipv6naddr = ipv4to6($netaddr);
\& $ipv6naddr = mask4to6($netaddr);
\& $ipv6naddr = ipanyto6($netaddr);
\& $ipv6naddr = maskanyto6($netaddr);
\& $netaddr = ipv6to4($pv6naddr);
\& $bcdtext = bin2bcd($bits128);
\& $bits128 = bcd2bin($bcdtxt);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBNetAddr::IP::UtilPP\fR provides pure Perl functions for \fBNetAddr::IP::Util\fR
.IP "\(bu" 4
\&\f(CW$rv\fR = hasbits($bits128);
.Sp
This function returns true if there are one's present in the 128 bit string
and false if all the bits are zero.
.Sp
.Vb 3
\& i.e. if (hasbits($bits128)) {
\& &do_something;
\& }
\&
\& or if (hasbits($bits128 & $mask128) {
\& &do_something;
\& }
.Ve
.Sp
This allows the implementation of logical functions of the form of:
.Sp
.Vb 2
\& if ($bits128 & $mask128) {
\& ...
\&
\& input: 128 bit IPv6 string
\& returns: true if any bits are present
.Ve
.IP "\(bu" 4
\&\f(CW$bitsXn\fR = shiftleft($bits128,$n);
.Sp
.Vb 3
\& input: 128 bit string variable,
\& number of shifts [optional]
\& returns: bits X n shifts
\&
\& NOTE: input bits are returned
\& if $n is not specified
.Ve
.IP "\(bu" 4
addconst($ipv6naddr,$signed_32con);
.Sp
Add a signed constant to a 128 bit string variable.
.Sp
.Vb 4
\& input: 128 bit IPv6 string,
\& signed 32 bit integer
\& returns: scalar carry
\& array (carry, result)
.Ve
.IP "\(bu" 4
add128($ipv6naddr1,$ipv6naddr2);
.Sp
Add two 128 bit string variables.
.Sp
.Vb 4
\& input: 128 bit string var1,
\& 128 bit string var2
\& returns: scalar carry
\& array (carry, result)
.Ve
.IP "\(bu" 4
sub128($ipv6naddr1,$ipv6naddr2);
.Sp
Subtract two 128 bit string variables.
.Sp
.Vb 4
\& input: 128 bit string var1,
\& 128 bit string var2
\& returns: scalar carry
\& array (carry, result)
.Ve
.Sp
Note: The carry from this operation is the result of adding the one's
complement of \s-1ARG2 +1\s0 to the \s-1ARG1.\s0 It is logically
\&\fB\s-1NOT\s0 borrow\fR.
.Sp
.Vb 2
\& i.e. if ARG1 >= ARG2 then carry = 1
\& or if ARG1 < ARG2 then carry = 0
.Ve
.IP "\(bu" 4
($spurious,$cidr) = notcontiguous($mask128);
.Sp
This function counts the bit positions remaining in the mask when the
rightmost '0's are removed.
.Sp
.Vb 6
\& input: 128 bit netmask
\& returns true if there are spurious
\& zero bits remaining in the
\& mask, false if the mask is
\& contiguous one\*(Aqs,
\& 128 bit cidr
.Ve
.IP "\(bu" 4
\&\f(CW$ipv6naddr\fR = ipv4to6($netaddr);
.Sp
Convert an ipv4 network address into an ipv6 network address.
.Sp
.Vb 2
\& input: 32 bit network address
\& returns: 128 bit network address
.Ve
.IP "\(bu" 4
\&\f(CW$ipv6naddr\fR = mask4to6($netaddr);
.Sp
Convert an ipv4 netowrk address into an ipv6 network mask.
.Sp
.Vb 2
\& input: 32 bit network/mask address
\& returns: 128 bit network/mask address
.Ve
.Sp
\&\s-1NOTE:\s0 returns the high 96 bits as one's
.IP "\(bu" 4
\&\f(CW$ipv6naddr\fR = ipanyto6($netaddr);
.Sp
Similar to ipv4to6 except that this function takes either an IPv4 or IPv6
input and always returns a 128 bit IPv6 network address.
.Sp
.Vb 2
\& input: 32 or 128 bit network address
\& returns: 128 bit network address
.Ve
.IP "\(bu" 4
\&\f(CW$ipv6naddr\fR = maskanyto6($netaddr);
.Sp
Similar to mask4to6 except that this function takes either an IPv4 or IPv6
netmask and always returns a 128 bit IPv6 netmask.
.Sp
.Vb 2
\& input: 32 or 128 bit network mask
\& returns: 128 bit network mask
.Ve
.IP "\(bu" 4
\&\f(CW$netaddr\fR = ipv6to4($pv6naddr);
.Sp
Truncate the upper 96 bits of a 128 bit address and return the lower
32 bits. Returns an IPv4 address as returned by inet_aton.
.Sp
.Vb 2
\& input: 128 bit network address
\& returns: 32 bit inet_aton network address
.Ve
.IP "\(bu" 4
\&\f(CW$bcdtext\fR = bin2bcd($bits128);
.Sp
Convert a 128 bit binary string into binary coded decimal text digits.
.Sp
.Vb 2
\& input: 128 bit string variable
\& returns: string of bcd text digits
.Ve
.IP "\(bu" 4
\&\f(CW$bits128\fR = bcd2bin($bcdtxt);
.Sp
Convert a bcd text string to 128 bit string variable
.Sp
.Vb 2
\& input: string of bcd text digits
\& returns: 128 bit string variable
.Ve
.SH "EXPORT_OK"
.IX Header "EXPORT_OK"
.Vb 10
\& hasbits
\& shiftleft
\& addconst
\& add128
\& sub128
\& notcontiguous
\& ipv4to6
\& mask4to6
\& ipanyto6
\& maskanyto6
\& ipv6to4
\& bin2bcd
\& bcd2bin
\& comp128
\& bin2bcdn
\& bcdn2txt
\& bcdn2bin
\& simple_pack
\& threads
.Ve
.SH "AUTHOR"
.IX Header "AUTHOR"
Michael Robinton <michael@bizsystems.com>
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2003 \- 2012, Michael Robinton <michael@bizsystems.com>
.PP
All rights reserved.
.PP
This program is free software; you can redistribute it and/or modify
it under the terms of either:
.PP
.Vb 3
\& a) the GNU General Public License as published by the Free
\& Software Foundation; either version 2, or (at your option) any
\& later version, or
\&
\& b) the "Artistic License" which comes with this distribution.
.Ve
.PP
This program is distributed in the hope that it will be useful,
but \s-1WITHOUT ANY WARRANTY\s0; without even the implied warranty of
\&\s-1MERCHANTABILITY\s0 or \s-1FITNESS FOR A PARTICULAR PURPOSE.\s0 See either
the \s-1GNU\s0 General Public License or the Artistic License for more details.
.PP
You should have received a copy of the Artistic License with this
distribution, in the file named \*(L"Artistic\*(R". If not, I'll be glad to provide
one.
.PP
You should also have received a copy of the \s-1GNU\s0 General Public License
along with this program in the file named \*(L"Copying\*(R". If not, write to the
.PP
.Vb 3
\& Free Software Foundation, Inc.,
\& 51 Franklin Street, Fifth Floor
\& Boston, MA 02110\-1301 USA
.Ve
.PP
or visit their web page on the internet at:
.PP
.Vb 1
\& http://www.gnu.org/copyleft/gpl.html.
.Ve
.SH "AUTHOR"
.IX Header "AUTHOR"
Michael Robinton <michael@bizsystems.com>