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.\" ========================================================================
.\"
.IX Title "BigIntSupport 3"
.TH BigIntSupport 3 "2002-07-24" "perl v5.8.0" "User Contributed Perl Documentation"
.SH "NAME"
BigIntSupport \- Perl extension for interfacing between Math::BigInt values and text strings.
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&  use BigIntSupport;
\&  use Math::BigInt;
.Ve
.PP
.Vb 10
\&  # Create Math::BigInt from an arbitrary-sized hex number
\&  my $bigint1 = hex2bigint("0xdeadbeefcafebabe01234567");
\&  my $bigint2 = hex2bigint("0xffffffff");
\&  # Do math
\&  $bigint2 <<= 32;
\&  $bigint1 &= $bigint2;
\&  # Get hex string back
\&  my $string = bigint2hex($bigint1);
\&  # Print it
\&  print "Result is 0x$string\en";
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This provides some interface functions for the Math::BigInt library,
which is part of the perl standard libary.  Basically, Math::BigInt is
a module for arbitrary-sized integers.  It overloads all the standard
math operators for use with Math::BigInt objects, but it does not
overload either the \fIhex()\fR function or sprintf \*(L"%x\*(R", so it is difficult
to use Math::BigInt objects for large hex numbers.  This module is a
solution to that problem.
.Sh "\s-1EXPORT\s0"
.IX Subsection "EXPORT"
The following functions are exported:
.IP "hex2bigint($hex_string)" 4
.IX Item "hex2bigint($hex_string)"
Interprets \f(CW$hex_string\fR as a hex number (whether or not a leading 0x is
present).  Returns a Math::BigInt object representing the number.  To
convert decimal numbers to Math::BigInt objects, use
Math::BigInt\->new($decimal_string).
.IP "bigint2hex($bigint)" 4
.IX Item "bigint2hex($bigint)"
Formats the given Math::BigInt object as a hexidecimal string and
returns it.  The string has no leading zeros or 0x.
.ie n .IP "bigint_sprintf($bigint, $format)" 4
.el .IP "bigint_sprintf($bigint, \f(CW$format\fR)" 4
.IX Item "bigint_sprintf($bigint, $format)"
Takes a Math::BigInt and a printf-style format string and returns a
string with the appropriately-formatted string.  The format string can
contain only \f(CW%x\fR or \f(CW%d\fR, and may optionally include a width
specification, which may include a leading zero.  In other words,
\&\*(L"%016x\*(R" is legal but \*(L"The answer is \f(CW%d\fR\*(R" is not.  A leading \*(L"%\*(R" is
optional.
.SH "AUTHOR"
.IX Header "AUTHOR"
Jeff Gibson, jgibson@afara.com
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIMath::BigInt\fR\|(3), \fIperl\fR\|(1).