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Current File : /usr/lib64/perl5/vendor_perl/Razor2/String.pm
# $Id: String.pm,v 1.48 2005/06/13 21:09:59 vipul Exp $
package Razor2::String;

use URI::Escape;
use Razor2::Preproc::enBase64;
use Data::Dumper;

BEGIN {
  eval  { require Digest::SHA;  import Digest::SHA  qw(sha1_hex); 1 }
  or do { require Digest::SHA1; import Digest::SHA1 qw(sha1_hex) }
}

#use MIME::Parser;

require Exporter;

our @ISA = qw(Exporter);

our @EXPORT = qw( hmac_sha1 xor_key
  from_batched_query
  to_batched_query findsimilar debugobj
  makesis parsesis makesis_nue parsesis_nue
  hextobase64 base64tohex
  randstr round
  hex_dump prep_mail
  prehash printb64table
  hexbits2hash hmac2_sha1
  fisher_yates_shuffle
);

# Same as the alphabet from RFC 1521, except s:/:_: and s:+:-:
my %b64table;

BEGIN {
    # ASCII
    # 33-126 printable chars
    # 48-57  numbers
    # 65-90  uppercase alpha
    # 97-122 lowercase alpha
    foreach ( 0 .. 25 )  { $b64table{$_} = chr( $_ + 65 ); }
    foreach ( 26 .. 51 ) { $b64table{$_} = chr( $_ + 71 ); }
    foreach ( 52 .. 61 ) { $b64table{$_} = chr( $_ - 4 ); }
    $b64table{62} = "-";
    $b64table{63} = "_";
}

sub printb64table {
    foreach ( 0 .. 63 ) {
        print "$_ = $b64table{$_}\n";
    }
}

sub hmac_sha1 {
    my $text = shift;
    my $iv1  = shift;
    my $iv2  = shift;
    my ( $b64, $hex ) = hmac2_sha1( $text, $iv1, $iv2 );
    return $b64;
}

# taken in part from RFC 2104
# http://www.cs.ucsd.edu/users/mihir/papers/hmac.html

sub hmac2_sha1 {
    my $text = shift;
    my $iv1  = shift;
    my $iv2  = shift;

    return unless $text && $iv1 && $iv2;
    die "no ref's allowed" if ref($text);

    my $digest = sha1_hex($iv2, $text);
    $digest = sha1_hex($iv1, $digest);

    return ( hextobase64($digest), $digest );
}

sub hmac3_sha1 {
    my $text = shift;
    my $iv1  = shift;
    my $iv2  = shift;

    return unless $text && $iv1 && $iv2;
    die "no ref's allowed" if ref($text);

    my $digest = $text;
    $digest = sha1_hex( $iv1 . $digest );
    $digest = sha1_hex( $iv2 . $digest );
    return ( hextobase64($digest), $digest );
}

# part of RFC 2104 - see hmac_sha1()

sub xor_key {
    my $key = shift;

    # key length should never be > 64 chars;
    #
    # dont need this ... see Bitwise String Operators
    # $enc .= '\0' x (64 - length($pass));

    my $iv1 = "\x36" x 64 ^ $key;
    my $iv2 = "\x5C" x 64 ^ $key;

    return ( $iv1, $iv2 );
}

# converts a string where each char is a hex (4-bit) value
#       to a string where each char is a base64 (6-bit) value

sub hextobase64 {

    my $hs = shift;

    my @b64s;
    my $i = 0;

    while ( $i < length($hs) ) {

        # process 3 hex char chunks at a time
        my $hex3 = substr $hs, $i, 3;
        $i += 3;

        my $bv = pack "h3", $hex3;
        my $cur = 0;
        foreach ( 0 .. 5 ) { my $bt = vec( $bv, $_, 1 ); $cur += $bt; $cur *= 2; }
        push @b64s, $cur / 2;
        $cur = 0;
        foreach ( 6 .. 11 ) { my $bt = vec( $bv, $_, 1 ); $cur += $bt; $cur *= 2; }
        push @b64s, $cur / 2;

        #foreach (0..15) { my $bt = vec($bv,$_,1); print "$_=$bt, cur=$cur\n"; }
        #print " -- hex=$hex3; @b64s\n";
    }

    my $bs = "";
    foreach (@b64s) { $bs .= $b64table{$_}; }

    # print "b64=$bs; hex=". base64tohex($bs) ."\n";

    # Fixme -  change encoding so 1 hex char ==> 1 b64 char
    # 64-char hex string ==> 44-char b64 string.  truncate to 43.
    # 40-char hex string ==> 28-char b64 string.  truncate to 27.
    # $bs = substr($bs, 0, 43) if (length $bs == 44) && (substr($bs, -1) eq '0');
    # $bs = substr($bs, 0, 27) if (length $bs == 28) && (substr($bs, -1) eq '0');

    return $bs;

}

# converts a string where each char is a base64 (6-bit) value
#       to a string where each char is a hex (4-bit) value

sub base64tohex {

    my $bs = shift;
    my @b64s;
    my $hexstr;

    # convert string to list of numbers base 10
    foreach my $chr ( split '', $bs ) {
        foreach ( keys %b64table ) {
            push @b64s, $_ if $b64table{$_} eq $chr;
        }
    }

    while (@b64s) {
        my $bv = "";
        vec( $bv, 0, 16 ) = 0;
        my $a = shift @b64s;
        foreach ( 0 .. 5 ) { my $i = 5 - $_; my $bt = $a % 2; vec( $bv, $i, 1 ) = $bt; $a = int( $a / 2 ); }
        $a = shift @b64s;
        foreach ( 6 .. 11 ) { my $i = 17 - $_; my $bt = $a % 2; vec( $bv, $i, 1 ) = $bt; $a = int( $a / 2 ); }
        $hexstr .= unpack "h3", $bv;
    }

    # print "hexstr=$hexstr; @b64s\n";

    #
    # NOTE on padding
    # if we pad 4 0-bits, we need to know that there wasn't an actual 0
    # on the input string (hexstr).
    #
    # since padding 4 0's is more common than having the last hex
    # be a 0, we could append a special char indicating last 4 0 bits
    # were not padding 0's.
    #
    # But, we will customize these functions for razor2's needs.
    # 64-char hex string ==> 43-char b64 string ==> 66-char hex.  truncate.
    # 40-char hex string ==> 27-char b64 string ==> 42-char hex.  truncate.
    # 15-char hex string ==> 10-char b64 string ==> 15-char hex.  ok.
    #
    # 20-byte hex string is 40 chars
    # $hexstr = substr($hexstr, 0, 20) if (length $hexstr == 21) && (substr($hexstr, -1) eq '0');
    # $hexstr = substr($hexstr, 0, 40) if (length $hexstr == 42) && (substr($hexstr, -2) eq '00');
    # $hexstr = substr($hexstr, 0, 64) if (length $hexstr == 66) && (substr($hexstr, -2) eq '00');

    $hexstr = substr( $hexstr, 0, 40 ) if ( length($hexstr) == 42 );
    $hexstr = substr( $hexstr, 0, 64 ) if ( length($hexstr) == 66 );
    return $hexstr;

}

# can be called 2 ways
# - makesis(%hash)    aka  makesis( p => 0, cf => 95 )
# - makesis($hashref) aka  makesis({p => 0, cf => 95})

sub makesis {
    my $first = shift;
    my $data;
    if ( ref($first) eq 'HASH' ) {
        $data = $first;
    }
    else {
        $data = { $first, @_ };
    }
    my $sis = '';
    foreach ( sort keys %$data ) {
        $sis .= "$_=" . ( exists $data->{$_} ? uri_escape( $data->{$_} ) : '' ) . '&';
    }

    # This is 10x faster than the equivalent regex version.
    return substr( $sis, 0, length($sis) - 1 ) . "\r\n";
}

sub parsesis {

    my $query = $_[1] || {};
    my $wantref = 1 if $_[1];

    # Parse the query.

    $_[0] =~ s/\n$//;    # SIS shouldn't have this!
    $_[0] =~ s/\r$//;    # SIS shouldn't have this!

    my @pairs = split /\&/, $_[0];

    for (@pairs) {
        my ( $key, $value ) = split /=/, $_;
        $query->{$key} = defined $value ? uri_unescape($value) : '';
    }

    return $query if $wantref;
    return %$query;
}

# version of makesis that doesn't to uri escaping
# for things we know don't require escaping

# can be called 2 ways
# - makesis(%hash)    aka  makesis( p => 0, cf => 95 )
# - makesis($hashref) aka  makesis({p => 0, cf => 95})

sub makesis_nue {
    my $first = shift;
    my $data;
    if ( ref($first) eq 'HASH' ) {
        $data = $first;
    }
    else {
        $data = { $first, @_ };
    }
    my $sis = '';
    foreach ( sort keys %$data ) {
        $sis .= "$_=";
        $sis .= $data->{$_} if exists( $data->{$_} );
        $sis .= '&';
    }

    # This is 10x faster than the equivalent regex version.
    return substr( $sis, 0, length($sis) - 1 ) . "\r\n";
}

sub parsesis_nue {

    my $query = $_[1] || {};
    my $wantref = 1 if $_[1];

    # Parse the query.
    $_[0] =~ s/\r\n$//;
    my @pairs = split /\&/, $_[0];

    for (@pairs) {
        my ( $key, $value ) = split /=/, $_;
        $query->{$key} = $value;
    }

    return $query if $wantref;
    return %$query;
}

sub to_batched_query {
    my ( $queries, $bql, $bqs, $novar ) = @_;
    my @bqueries;

    # Breaks up queries into batches, where batches are limited to:
    # - at most $bql lines long --OR--
    # - at most $bqs kb in size
    # if bqs or bql == 0 or undef, no limit.
    #
    # fixme - optimization for aggregator:
    #         sort, so all checks are together, all reports together, etc.
    #         problem is user will want to maintain array order

    # $queries is array ref of either:
    #   strings  - sis, ready to go
    #   hash ref - need to create sis
    # my $q = ref($queries->[0]) eq 'HASH' ?  makesis_batch($queries) : $queries;

    # for right now, we'll just assume hash ref
    return unless ref( $queries->[0] ) eq 'HASH';

    my $last;
    my $line;
    my $linecnt   = 0;
    my $batchmode = 0;
    foreach my $cur (@$queries) {

        # my $dobj = debugobj($cur); print "dbg-doing obj: $dobj\n";

        #
        # handle cases where we submit email blob (message = * )
        #
        if ( exists $cur->{message} ) {
            my $msg = $cur->{message};
            delete $cur->{message};
            $line = "-" . makesis($cur);
            $cur->{message} = $msg;
            $line =~ s/\r\n$//s;
            $line .= "&message=*\r\n$msg\r\n.\r\n";
            push @bqueries, $line;
            next;
        }

        unless ($last) {
            #
            # start beginning of new batch
            #
            $last = $cur;
            next;
        }
        unless ($batchmode) {
            #
            # line after beginning of new batch
            # if similar, start variable batchmode.
            # if not,     start batchmode without variables
            #
            my ( $both, $diff ) = findsimilar( $last, $cur );
            if ( $diff && !$novar ) {
                $batchmode = 2;
                $line      = "-" . makesis_nue($both);

                # fixme - we might want to uri_escape()
                # but everything should be alphanum or our uri-safe base64
                $line .= join( ",", map "$last->{$_}", @$diff ) . "\r\n";
                $line .= join( ",", map "$cur->{$_}",  @$diff ) . "\r\n";
                $last    = $both;    # last is now 'template'
                $linecnt = 2;
            }
            else {
                $batchmode = 1;
                $line      = "-" . makesis($last);
                $line .= makesis_nue($cur);
                $linecnt = 2;
            }
            next;
        }
        else {
            #
            # We're in batchmode.
            # end if batch maxed out (bqs or bql reached)
            # end if batchmode with variables and cur doesn't match
            # end batch
            #
            my ( $both, $diff ) = findsimilar( $last, $cur ) if ( $batchmode == 2 );
            if (   ( $bqs && ( length($line) > ( $bqs * 1024 ) ) )
                || ( $bql && ( $linecnt >= $bql ) )
                || ( $batchmode == 2 && !$diff ) ) {
                $batchmode = 0;
                $line .= ".\r\n";
                push @bqueries, $line;
                $last = $cur;
            }
            else {
                #
                # fixme - we might go passed bqs by a little bit. prolly ok.
                #
                if ( $batchmode == 2 ) {
                    $line .= join( ",", map "$cur->{$_}", @$diff ) . "\r\n";
                }
                else {
                    $line .= makesis_nue($cur);
                }
                $linecnt++;
            }
        }
    }
    if ($batchmode) {
        $line .= ".\r\n";
        push @bqueries, $line;
    }
    elsif ($last) {
        $line = makesis($last);
        push @bqueries, $line;
    }

    return \@bqueries;
}

# compares keys in hash ref's a & b
#
# return
#   if both hashes have different keys
#
# return (1)
#   if both hashes have same keys and values,
#
# returns 2 refs
#   if both hashes have same keys but different values
#   - first  is hash, copy of a & b where vals are same.
#     where vals are diff, keys are copied with val = '?'
#   - second is list contains keys where values are different

sub findsimilar {
    my ( $a, $b ) = @_;
    my @diffvalues = ();
    my %samevalues = ();

    foreach ( sort keys %$a ) {
        return unless exists $b->{$_};
        if ( $b->{$_} eq $a->{$_} ) {
            $samevalues{$_} = $a->{$_};
        }
        else {
            $samevalues{$_} = "?";
            push @diffvalues, $_;
        }
    }
    foreach ( sort keys %$b ) {
        return unless exists $a->{$_};
    }

    # if too hashes are exactly the same, not sure.
    # treat as if they are totally different.
    return (1) unless scalar(@diffvalues) > 0;

    return ( \%samevalues, \@diffvalues );
}

sub from_batched_query {

    my ($queries) = @_;
    my @queries;

    my ( $fq, $rq ) = $queries =~ m:^\-(.*?)\r\n(.*)$:sm;

    unless ( $fq && $rq ) {

        # allow from_batched_query to handle non-batches
        $fq = $queries;
        $rq = "";
    }

    if ( $fq =~ m:\?: ) {

        my %template_query = ();
        my @seq            = ();
        my @pairs          = split /\&/, $fq;
        for (@pairs) {
            my ( $key, $value ) = split /=/, $_;
            if ( $value eq "?" ) {
                push @seq, $key;
            }
            else {
                $template_query{$key} = $value ? uri_unescape($value) : '';
            }
        }

        for ( split /\r\n/, $rq ) {
            my @values = split /,/, $_;
            my %foo = %template_query;
            @foo{@seq} = @values;
            push @queries, \%foo;
        }

        return undef unless @queries;

    }
    elsif ( $fq =~ m:\*: ) {

        my %query = parsesis($fq);
        for ( keys %query ) {
            if ( $query{$_} eq "*" ) {
                $query{$_} = $rq;
                last;
            }
        }
        push @queries, \%query;

    }
    else {

        # Don't split $queries.  Use $fq and $rq instead since
        # $fq is already normalized.

        my %q = parsesis($fq);
        push @queries, \%q;
        for ( split /\r\n/, $rq ) {
            my %q = parsesis($_);
            push @queries, \%q;
        }

    }

    return \@queries;

}

sub randstr {

    my $size     = shift;
    my $alphanum = shift;
    my $str;

    $alphanum = 1 if !defined($alphanum);

    # ASCII
    # 33-126 printable chars
    # 48-57  numbers
    # 65-90  uppercase alpha
    # 97-122 lowercase alpha

    while ( $size-- ) {
        if ($alphanum) {
            $str .= $b64table{ int( rand 64 ) };
        }
        else {
            $str .= chr( int( rand 94 ) + 33 );
        }
    }

    return $str;

}

sub escape_smtp_terminator {

    my ($textref) = @_;
    $$textref =~ s/\r\n\./\r\n\.\./gm;

}

sub unescape_smtp_terminator {

    my ($textref) = @_;
    $$textref =~ s/\r\n\.\./\r\n\./gm;

}

sub hex_dump {
    my $string = shift;

    for ( split //, $string ) {
        print ord($_) . " ";
    }
    print "\n";
}

sub hash2str {

    my $href = shift;
    my %hash = %$href;
    my ( $str, $key );

    for $key ( keys %hash ) {
        my $tstr;
        if ( ref $hash{$key} eq 'ARRAY' ) {
            for ( @{ $hash{$key} } ) { $tstr .= escape($_) . "," }
            $str =~ s/,$//;
        }
        elsif ( !( ref $hash{$key} ) ) {
            $tstr .= escape( $hash{$key} );
        }
        if ($tstr) { $str .= "$key:$tstr&" }
    }

    $str =~ s/&$//;
    return $str;

}

sub str2hash {

    my $str = shift;
    my %hash;
    my @pairs = split /(?<!\\)&/, $str;

    for (@pairs) {
        my ( $key, $data ) = split /(?<!\\):/, $_, 2;
        if ( $data =~ /(?<!\\),/ ) {
            my @list = split /(?<!\\),/, $data;
            for (@list) { $_ = unescape($_) }
            $hash{$key} = [@list];
        }
        else { $hash{$key} = unescape($data) }
    }

    return \%hash;

}

#
# If body of an email has mime attachments, the headers
# will indicate this.  likewise, each mime attachment
# could also have nested mime attachments with headers that
# must indicate this.  standard recursion.
#
# However, all 'leaf node' attachments don't have to have
# headers based on RFC xxx.  They must be created before
# sending to razor servers.
#
#
# Example of mail with nested MIME attachments:
#
#     level 1     level 2      level 3  ....
#    --------------------------------------
# * - Header 1
# * - Body   1
#      * -- A -- mime-header 2A
#      |         mime-body 2A
#      |            |
#      |            * ---- a --- mime-header 3a
#      |            |            mime-body   3a
#      |            |
#      |            * -----b --- mime-header 3b
#      |                         mime-body   3b
#      * -- B -- mime-body 2B
#      |
#      * -- C -- mime-header 2C
#                   |
#                   * ---- c -- mime-body   3c
#                   |
#                   * ---- d -- mime-header 3d
#                               mime-body   3d
#
# should be reported as
#
# Header 1 \r\n
# part 1 = p(header 3a, body 3a) \r\n
# part 2 = p(header 3b, body 3b) \r\n
# part 3 = p(<generated header 2B>, body 2B) \r\n
# part 4 = p(<generated header 3c>, body 3c) \r\n
# part 5 = p(header 3d, body 3d) \r\n
# .\r\n
#
# Notes:
# - Order of parts does not matter.
#
# - Each part is processed by prep_mail, p(), before report/check
#
# - Except for original Header everything but leaf nodes
#   are discarded.  In the above example,
#
#   Body 1, header 2A, header 2C - are discarded
#
#
# Detailed Explanation:
#
# Header 1 says 'Content-Type: multipart' with boundary definition
# Based on the Boundary, Body 1 is split into A, B, C.
#
# A is analyzed, has headers which also say 'Content-Type: multipart'
# with a different boundary, and it is split into 3a, 3b. 2A is what
# appears between header 2a and first boundary, so its ignored.
# 3a and 3b both have header info, so they are sent thru prep_mail
# and reported/checked
#
# <generated header 2B>  is based on Header 1 to determine content
#                        type.  if unknown, dummy header is added,
#                        and both are reported as a body part
#
# C is analyzed, has headers which also say 'Content-Type: multipart'
# with a different boundary, and it is split into 3c, 3d.
#
# <generated header 3c>  is based on header 2c to determine content
#                        type.  if unknown, dummy header is added,
#                        and both are reported as a body part
#
# 3d has header info, so header+body are sent thru prep_mail
# and reported/checked
#
#
#
# prep_mail() basically truncates msgs that are too big and/or
# base64 encodes binaries or 8-bit msgs.
#

# Split mime splits up multi-part mime mails.
#
# returns array of parts, where each part is
# headers\n\nbody
#
# headers will only contain X-Razor2 and Content- headers
#
# If not a mime mail, and the headers do not have any
# Content-* headers, then the only headers will be X-Razor2 ones
# (perhaps create Content-Type in da future?)
#
# body can be blank.  nuked in prep_part
#
sub split_mime {

    my ( $mailref, $ver, $recursive, $debug ) = @_;

    return unless ref($mailref);

    # mime-bodies must have header or initial blank lines.
    #
    my ( $hdr, $body ) = split /\n\r*\n/, $$mailref, 2;
    my $no_valid_mime_hdr = 0;

    unless ($body) {

        # no blank lines, definately no header, so no nested mimes

        print "split_mime: no blank lines\n" if $debug > 1;
        $no_valid_mime_hdr = 1;
    }

    # fixme - handle attachments?  i.e. if header has this
    # Content-Disposition: attachment
    # than body is mail,  we could recursively call ourselves
    # again with body (check body for hdrs first?)

    # Make sure $hdr is really a hdr
    #
    # Details: If mime part is not RFC compliant, it could just
    # be a body with blank lines.  hdr could have just matched part
    # of the body.
    #
    # valid mime header is determined by existance of 'Content-Type'
    # If we're not recursive, we don't check orig_headers, we assume its ok.
    # not sure if this is the best way ...
    #

    if ( $recursive && ( $hdr !~ /^Content-Type:/i ) ) {
        $no_valid_mime_hdr = 1;
        print "uh-oh, bad mime-body len=" . length($$mailref) . ":\n$$mailref\n" if $debug;

        #print "split_mime: recur=($recursive)\n";
    }

    if ($no_valid_mime_hdr) {
        #
        # create dummy header and return it
        #
        # $ver should be '1' or client name + version
        my $mimepart = "X-Razor2-Agent: $ver\n";
        my $hrdlen   = length($mimepart);

        # if it has initial blank line, hurray for rfc compliance
        if ( $$mailref =~ /^\n/ ) {
            $mimepart .= $$mailref;
        }
        else {
            $mimepart .= "\n" . $$mailref;
        }
        print "split_mime: returning total_len=" . length($mimepart) . "; hdrs=" . $hdrlen . ", body=" . length($$mailref) . "\n" if $debug;
        return ( \$mimepart );
    }

    #
    # Now we split mailref into hdr and body
    # check hdr for nested mime (boundary)
    #

    my $orig_hdr = $hdr;
    $hdr =~ s/\n\s+//sg;    # merge multi-line headers
                            # nuke everything but X-Razor2 and Content-* headers
    my $trimmed_hdr = "";
    foreach ( split '\n', $hdr ) {
        /^Content-/i and $trimmed_hdr .= "$_\n";
        /^X-Razor2/i and $trimmed_hdr .= "$_\n";
    }

    my $boundary = "";

    if ( $trimmed_hdr =~ /Content-Type: multipart.+boundary=("[^"]+"|\S+)/ig ) {
        $boundary = $1;
    }

    if ( $boundary eq "" ) {
        #
        # valid mime hdr, but no nested mime.
        # add razor hdr and return.
        #
        print "split_mime: valid_mime_hdr [len=" . length($orig_hdr) . "], but no nested mime\n$orig_hdr\n" if $debug > 1;
        $trimmed_hdr = "X-Razor2-Agent: $ver\n" . $trimmed_hdr;
        my $mimepart = "$trimmed_hdr\n$body";
        print "split_mime: returning total=" . length($mimepart) . "; hdrs=" . length($trimmed_hdr) . ", body=" . length($body) . "\n" if $debug;
        return ( \$mimepart );
    }
    $boundary = $1 if $boundary =~ /^"(.*)"$/;

    # At this point,  we know body has mime parts.
    #
    my @mimeparts;

    #
    # According to RFC 1341
    # http://www.w3.org/Protocols/rfc1341/7_2_Multipart.html
    #
    # mimes are separated by \n--boundary\n
    # and are followed immediately by  header, blank line, body;
    # or blank line and body.
    #
    # if no header in mime part, default content type for mime body is
    # based on header where 'Content-Type: multipart*' was defined, where
    #   multipart/digest --> message/rfc822
    #   multipart/*      --> text/plain
    # perhaps we should add a header if none present?
    #
    # if a body contains mimes, the 'preable', or stuff before
    # the first boundary, and the 'epilogue', the stuff after the
    # last boudary, are to be ignored.
    #
    # NOTE: We split up multiparts, but content-type's can also be
    #       nested.  i.e, a header of 'Content-Type: message' can have a body
    #       of 'Content-Type: image'
    #
    $body =~ s/\n\Q--$boundary--\E.*$//sg;    # trash last boundary and epilogue
    if ( $body =~ /^\Q--$boundary\E\r*\n/ ) {

        # bug in some mails, make it RFC compliant
        # now our split will work correctly
        print "bad mime body [len=" . length($body) . "], not doing \\n--boundary, fixed tho.\n" if $debug > 1;
        $body = "garbage\n$body";
    }
    my @tmpparts;
    unless ( $body =~ /\Q--$boundary\E/ ) {

        # Sometimes there's a boundary in the headers
        # but none in email.  In such cases, we'll
        # treat the entire body as a part.
        push @tmpparts, "garbage";
        push @tmpparts, $body;
    }
    else {
        @tmpparts = split /\n\Q--$boundary\E\r*\n/, $body;
    }
    shift @tmpparts;    # trash everything up to the first boundary;
    foreach (@tmpparts) {

        # perhaps we should add a header based on default content-type?
        unless (/\S/s) {
            print "skipping body part containing only whitespace [len=" . length($_) . "]\n" if $debug;
            next;
        }
        print "boundary:  " . $recursive . "$boundary\n" if $debug > 1;
        push @mimeparts, split_mime( \$_, $ver, "  " . $recursive, $debug );
    }
    print "Saweeet!!! Boundary (" . scalar(@mimeparts) . "): $boundary\n" if defined($boundary) && ( $debug > 1 );

    return @mimeparts;
}

# mailref is not modified by this sub
#
sub prep_part {
    my ( $mailref, $maxheader, $maxbody ) = @_;

    #print "[". length($$mailref) ."] maxsize=$maxheader + $maxbody\n";

    my ( $hdr, $body ) = split /\n\r*\n/, $$mailref, 2;
    $hdr .= "\n";    # put newline back on last header line

    unless ($body) {

        #
        # fixme - this should not happen.
        # if it does, split_mime needs work
        #
        # print "prep_part got F**KED-up mimepart [len=". length($$mailref) ."]\n$$mailref\n";
        return;    # body is empty
    }

    # fixme - are these the best chars to check for binary?
    my $is_binary = ( $hdr =~ /^Content-Type-Encoding: 8-bit/ )
      || ( $body =~ /([\x00-\x1f|\x7f-\xff])/ and $1 !~ /[\r\n\t]/ );

    my $enBase64 = new Razor2::Preproc::enBase64;
    $is_binary = $enBase64->isit($mailref);
    $enBase64->doit( \$body ) if $is_binary;

    $body =~ s/\r+\n/\n/sg;    # outlook sometimes does \r\r\n
    $hdr =~ s/\r+\n/\n/sg;

    if ( ( my $len = length($body) ) > $maxbody ) {
        $body = substr $body, 0, $maxbody;
        substr( $body, -2 ) = "==" if $is_binary;

        $hdr = "X-Razor2-Origlen-Body: $len\n" . $hdr;

        #print "maxbody=$maxbody body went from $len to ". length($body) ."\n";
    }

    if ( ( my $len = length($hdr) ) > $maxheader ) {
        $hdr = "X-Razor2-Origlen-Header: $len\n" . $hdr;
        if ( length($hdr) > $maxheader ) {
            $hdr = substr $hdr, 0, $maxheader;
            $hdr =~ s/([^\n]+)$//s;    # remove last, incomplete line
        }

        # print "maxhdr=$maxheader header went from $len to ". length($hdr) ."\n";
    }

    my $dude = "$hdr\n$body";

    return $mailref if $dude eq $$mailref;    # this happens majority of the time
    return \$dude;
}

# NOTE: Important function!
#       *must* be kept in sync with server and all clients
#       same holds true for prep_part()
#
# This is the preprocessing done on a mail before sent over network
#
sub prep_mail {
    my ( $mailref, $report_headers, $maxheader, $maxbody, $maxorighdr, $versionstring, $debug ) = @_;
    return unless ref($mailref);

    print " prep_mail: orig=" . length($$mailref) . "\n" if ( $debug > 1 );

    my ($orig_hdr) = split /\n\r*\n/, $$mailref, 2;
    $orig_hdr .= "\n";    # put newline back on last header line

    my $ver = $versionstring || 1;
    my @mimeparts = split_mime( $mailref, $ver, 0, $debug );

    my @mimeparts_prep;
    foreach (@mimeparts) {
        push @mimeparts_prep, prep_part( $_, $maxheader, $maxbody );
    }
    unless ($report_headers) {
        my $hdr = "X-Razor2-Headers-Suppressed: 1\n";
        foreach ( split '\n', $orig_hdr ) {
            /^Content-/i and $hdr .= "$_\n";
            /^X-Razor2/i and $hdr .= "$_\n";
        }
        $orig_hdr = $hdr;
    }

    if ( ( my $len = length($orig_hdr) ) > $maxorighdr ) {
        $hdr = "X-Razor2-Origlen-Header: $len\n" . $orig_hdr;
        if ( length($hdr) > $maxorighdr ) {
            $hdr = substr $hdr, 0, $maxorighdr;
            $hdr =~ s/([^\n]+)$//s;    # remove last, incomplete line
        }

        #print "max=$maxorighdr orig_header went from $len to ". length($hdr) ."\n";
        $orig_hdr = $hdr;
    }

    if ( $debug > 1 ) {
        print "**** prep_mail done: headers=" . length($orig_hdr);
        foreach ( 0 .. $#mimeparts_prep ) {
            print "\n**** mail $_ [" . length( ${ $mimeparts_prep[$_] } ) . "] " . substr( ${ $mimeparts_prep[$_] }, 0, 40 );
        }
        print "\n\n";
    }

    return ( \$orig_hdr, @mimeparts_prep );
}

# from MIME::Parser
#my $parser = new MIME::Parser;
#my $entity = $parser->parse($body);
# foreach (dump_entity($entity))
sub dump_entity {
    my $ent   = shift;
    my @parts = $ent->parts;

    if (@parts) {    # multipart...
        map { dump_entity($_) } @parts;
    }
    else {           # single part...
        return ( $ent->body );    # return text blob
        print "    Part: ", $ent->bodyhandle->path, " (", scalar( $ent->head->mime_type ), ")\n";
    }
}

# input:  hex string ("2D")
# output: hash ref or array containg bits that are set
#         2D == (1, 3, 4, 6)

sub hexbits2hash {

    my $hex = shift;
    my %h;
    for ( 0 .. 31 ) {
        if ( hex($hex) & ( 2**31 ) >> ( 31 - $_ ) ) { $h{ $_ + 1 } = 1 }
    }
    return wantarray ? ( sort keys %h ) : \%h;

}

# input:  hash ref, array ref, or array containg bits that are set
# output: hex string ("2D")
#         2D == (4, 8, 32)

sub hash2hexbits {
    my @bits = @_;

    @bits = @{ $bits[0] } if ref( $bits[0] ) eq 'ARRAY';
    @bits = ( sort keys %{ $bits[0] } ) if ref( $bits[0] ) eq 'HASH';

    my @all;
    my $i = 1;
    foreach ( sort { $a <=> $b } @bits ) {
        while (1) {
            push @all, 1 if $_ == $i;
            last if $_ == $i;
            push @all, 0;
            $i++;
        }
    }
    my $bs = join '', reverse @all;

    # fixme needs testing
    my $hex = ( unpack "H*", pack "B*", join '', reverse @all );

    return $hex;
}

# for debugging - dumps a obj to a string
sub debugobj {
    my ( $obj, $prefix, $maxwidth ) = @_;

    $maxwidth ||= 70;
    return if ( defined($prefix) && length($prefix) > $maxwidth );

    my $line = "";
    $prefix .= " " x 4;

    if ( my $r = ref($obj) ) {
        if ( $r eq 'HASH' ) {
            $line = "$r - $obj," . scalar( keys %$obj ) . " keys\n";
            foreach ( sort keys %$obj ) {
                $line .= "$prefix$_ => " . debugobj( $obj->{$_}, $prefix );
            }
            $line .= $prefix . "[empty]\n" unless ( keys %$obj );
        }
        elsif ( $r eq 'ARRAY' ) {
            $line = "$r - $obj," . scalar(@$obj) . " items\n";
            foreach (@$obj) {
                $line .= $prefix . debugobj( $_, $prefix );
            }
            $line .= $prefix . "[empty]\n" unless (@$obj);
        }
        elsif ( $r eq 'REF' ) {
            $line = "$r - $obj\n";
            $line .= $prefix . debugobj( $$obj, $prefix );
        }
        elsif ( $r eq 'SCALAR' ) {
            $line = "$r - $obj\n";
            $line .= $prefix . debugobj( $$obj, $prefix );
        }
    }
    else {
        if ( defined $obj ) {
            $line = $1 if substr( $obj, 0, $maxwidth - length($prefix) ) =~ /^([^\n]+)/;
            $line = "[length=" . length($obj) . "] " . $line
              if ( length($line) ne length($obj) );
        }
        else {
            $line = "[empty]";
        }
        $line .= "\n";
    }
    return $line;
}

sub clean_body {

    my ( $self, $bodyref ) = @_;

    my $hasheaders = 1;

    if ( $self->{preprocs}->{deBase64}->isit($bodyref) ) {
        $self->{preprocs}->{deBase64}->doit($bodyref);
        $hasheaders = 0;
    }

    if ( $self->{preprocs}->{deQP}->isit($bodyref) ) {
        $self->{preprocs}->{deQP}->doit($bodyref);
        $hasheaders = 0;
    }

    if ( $self->{preprocs}->{deHTML}->isit($bodyref) ) {
        $self->{preprocs}->{deHTML}->doit($bodyref);
    }

    if ($hasheaders) {
        $$bodyref =~ s/^.*?\n\n//s;
    }

}

sub round {

    my $float = shift;
    return sprintf( "%.0f", $float );

}

sub fisher_yates_shuffle {
    my $deck = shift;    # $deck is a reference to an array
    my $i    = @$deck;
    while ( $i-- ) {
        my $j = int rand( $i + 1 );
        @$deck[ $i, $j ] = @$deck[ $j, $i ];
    }
}

1;


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