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For_More_Tools:
package Digest::file;
use strict;
use warnings;
use Exporter ();
use Carp qw(croak);
use Digest ();
our $VERSION = "1.19";
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 $ctx;
}
sub digest_file {
digest_file_ctx(@_)->digest;
}
sub digest_file_hex {
digest_file_ctx(@_)->hexdigest;
}
sub digest_file_base64 {
digest_file_ctx(@_)->b64digest;
}
1;
__END__
=head1 NAME
Digest::file - Calculate digests of files
=head1 SYNOPSIS
# Poor mans "md5sum" command
use Digest::file qw(digest_file_hex);
for (@ARGV) {
print digest_file_hex($_, "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>