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.\"
.IX Title "Crypt::Random::Source::Base::Handle 3pm"
.TH Crypt::Random::Source::Base::Handle 3pm "2014-08-05" "perl v5.20.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
Crypt::Random::Source::Base::Handle \- IO::Handle based random data sources
.SH "VERSION"
.IX Header "VERSION"
version 0.08
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&    use Moose;
\&    extends qw(Crypt::Random::Source::Base::Handle);
\&
\&    sub open_handle {
\&        # invoked as needed
\&    }
\&
\&
\&    # this class can also be used directly
\&    Crypt::Random::Source::Base::Handle\->new( handle => $file_handle );
\&
\&
\&    # it supports some standard methods:
\&
\&    $p\->blocking(0);
\&
\&    $p\->read( my $buf, $n ); # no error handling here
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This is a concrete base class for all IO::Handle based random data sources.
.PP
It implements error handling
.SH "ATTRIBUTES"
.IX Header "ATTRIBUTES"
.SS "handle"
.IX Subsection "handle"
An IO::Handle or file handle to read from.
.SS "blocking"
.IX Subsection "blocking"
This is actually handled by \f(CW\*(C`handle\*(C'\fR, and is documented in IO::Handle.
.SS "allow_under_read"
.IX Subsection "allow_under_read"
Whether or not under reading is considered an error.
.PP
Defaults to false.
.SS "reread_attempts"
.IX Subsection "reread_attempts"
The number of attempts to make at rereading if the handle did not provide
enough bytes on the first attempt.
.PP
Defaults to 1.
.PP
Only used if \f(CW\*(C`allow_under_read\*(C'\fR is enabled.
.SH "METHODS"
.IX Header "METHODS"
.SS "get"
.IX Subsection "get"
See \*(L"get\*(R" in Crypt::Random::Source::Base.
.PP
When \f(CW\*(C`blocking\*(C'\fR or \f(CW\*(C`allow_under_read\*(C'\fR are set to a true value this method may
return fewer bytes than requested.
.SS "read"
.IX Subsection "read"
This delegates directly to \f(CW\*(C`handle\*(C'\fR.
.PP
It \fB\s-1DOES NOT\s0\fR provide the same validation as \f(CW\*(C`get\*(C'\fR would have, so no checking
for underreads is done.
.SS "close"
.IX Subsection "close"
Close the handle and clear it.
.SS "_read"
.IX Subsection "_read"
\&\f(CW\*(C`$self\->handle\->read\*(C'\fR but with additional error checking and different
calling conventions.
.SS "_read_too_short"
.IX Subsection "_read_too_short"
Called by \f(CW\*(C`_read\*(C'\fR when not enough data was read from the handle. Normally it
will either die with an error or attempt to reread. When \f(CW\*(C`allow_under_read\*(C'\fR is
true it will just return the partial buffer.
.SS "open_handle"
.IX Subsection "open_handle"
Abstract method, should return an IO::Handle to use.
.SH "AUTHOR"
.IX Header "AUTHOR"
\&\s-1XXXX XXX\s0'\s-1XX \s0(Yuval Kogman) <nothingmuch@woobling.org>
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
This software is copyright (c) 2008 by Yuval Kogman.
.PP
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.