#!/usr/local/bin/perl

# Name:		dbinfo -- identify berkeley DB version used to create 
#			  a database file
#
# Author:	Paul Marquess  <Paul.Marquess@btinternet.com>
# Version: 	1.02 
# Date		20th August 1999
#
#     Copyright (c) 1998 Paul Marquess. All rights reserved.
#     This program is free software; you can redistribute it and/or
#     modify it under the same terms as Perl itself.

# Todo: Print more stats on a db file, e.g. no of records
#       add log/txn/lock files

use strict ;

my %Data =
	(
	0x053162 =>	{
			  Type 	   => "Btree",
			  Versions => 
				{
				  1	=> "Unknown (older than 1.71)",
				  2	=> "Unknown (older than 1.71)",
				  3	=> "1.71 -> 1.85, 1.86",
				  4	=> "Unknown",
				  5	=> "2.0.0 -> 2.3.0",
				  6	=> "2.3.1 -> 2.7.7",
				  7	=> "3.0.0 or greater",
				}
			},
	0x061561 => 	{
			  Type     => "Hash",
			  Versions =>
				{
				  1	=> "Unknown (older than 1.71)",
        			  2     => "1.71 -> 1.85",
        			  3     => "1.86",
        			  4     => "2.0.0 -> 2.1.0",
        			  5     => "2.2.6 -> 2.7.7",
        			  6     => "3.0.0 or greater",
				}
			},
	0x042253 => 	{
			  Type     => "Queue",
			  Versions =>
				{
				  1	=> "3.0.0 or greater",
				}
			},
	) ;

die "Usage: dbinfo file\n" unless @ARGV == 1 ;

print "testing file $ARGV[0]...\n\n" ;
open (F, "<$ARGV[0]") or die "Cannot open file $ARGV[0]: $!\n" ;

my $buff ;
read F, $buff, 20 ;

my (@info) = unpack("NNNNN", $buff) ;
my (@info1) = unpack("VVVVV", $buff) ;
my ($magic, $version, $endian) ;

if ($Data{$info[0]}) # first try DB 1.x format
{
    $magic = $info[0] ;
    $version = $info[1] ;
    $endian  = "Unknown" ;
}
elsif ($Data{$info[3]}) # next DB 2.x big endian
{
    $magic = $info[3] ;
    $version = $info[4] ;
    $endian  = "Big Endian" ;
}
elsif ($Data{$info1[3]}) # next DB 2.x little endian
{
    $magic = $info1[3] ;
    $version = $info1[4] ;
    $endian  = "Little Endian" ;
}
else
  { die "not a Berkeley DB database file.\n" }

my $type = $Data{$magic} ;
my $magic = sprintf "%06X", $magic ;

my $ver_string = "Unknown" ;
$ver_string = $type->{Versions}{$version}
	if defined $type->{Versions}{$version} ;

print <<EOM ;
File Type:		Berkeley DB $type->{Type} file.
File Version ID:	$version
Built with Berkeley DB:	$ver_string
Byte Order:		$endian
Magic:			$magic
EOM

close F ;

exit ;
