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package Digest::file;
use strict;
use warnings;
use Exporter ();
use Carp qw(croak);
use Digest ();
our $VERSION   = "1.20";
our @ISA       = qw(Exporter);
our @EXPORT_OK = qw(digest_file_ctx digest_file digest_file_hex digest_file_base64);
sub digest_file_ctx {
    my $file = shift;
    croak("No digest algorithm specified") unless @_;
    open( my $fh, "<", $file ) || croak("Can't open '$file': $!");
    binmode($fh);
    my $ctx = Digest->new(@_);
    $ctx->addfile($fh);
    close($fh);
    return $ctx;
}
sub digest_file {
    digest_file_ctx(@_)->digest;
}
sub digest_file_hex {
    digest_file_ctx(@_)->hexdigest;
}
sub digest_file_base64 {
    digest_file_ctx(@_)->b64digest;
}
1;
__END__
HideShow 44 lines of Pod
=head1 NAME
Digest::file - Calculate digests of files
=head1 SYNOPSIS
  # Poor mans "md5sum" command
  use Digest::file qw(digest_file_hex);
  for (@ARGV) {
      print digest_file_hex($_, "MD5"), "  $_\n";
  }
=head1 DESCRIPTION
This module provide 3 convenience functions to calculate the digest
of files.  The following functions are provided:
=over
=item digest_file( $file, $algorithm, [$arg,...] )
This function will calculate and return the binary digest of the bytes
of the given file.  The function will croak if it fails to open or
read the file.
The $algorithm is a string like "MD2", "MD5", "SHA-1", "SHA-512".
Additional arguments are passed to the constructor for the
implementation of the given algorithm.
=item digest_file_hex( $file, $algorithm, [$arg,...] )
Same as digest_file(), but return the digest in hex form.
=item digest_file_base64( $file, $algorithm, [$arg,...] )
Same as digest_file(), but return the digest as a base64 encoded
string.
=back
=head1 SEE ALSO
L<Digest>