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package CGI::Util;
use parent 'Exporter';
require 5.008001;
use strict;
our @EXPORT_OK = qw(rearrange rearrange_header make_attributes unescape escape
        expires ebcdic2ascii ascii2ebcdic);

our $VERSION = '4.54';

our $_EBCDIC = "\t" ne "\011";

my $appease_cpants_kwalitee = q/
use strict;
use warnings;
#/;

# (ord('^') == 95) for codepage 1047 as on os390, vmesa
our @A2E = (
   0,  1,  2,  3, 55, 45, 46, 47, 22,  5, 21, 11, 12, 13, 14, 15,
  16, 17, 18, 19, 60, 61, 50, 38, 24, 25, 63, 39, 28, 29, 30, 31,
  64, 90,127,123, 91,108, 80,125, 77, 93, 92, 78,107, 96, 75, 97,
 240,241,242,243,244,245,246,247,248,249,122, 94, 76,126,110,111,
 124,193,194,195,196,197,198,199,200,201,209,210,211,212,213,214,
 215,216,217,226,227,228,229,230,231,232,233,173,224,189, 95,109,
 121,129,130,131,132,133,134,135,136,137,145,146,147,148,149,150,
 151,152,153,162,163,164,165,166,167,168,169,192, 79,208,161,  7,
  32, 33, 34, 35, 36, 37,  6, 23, 40, 41, 42, 43, 44,  9, 10, 27,
  48, 49, 26, 51, 52, 53, 54,  8, 56, 57, 58, 59,  4, 20, 62,255,
  65,170, 74,177,159,178,106,181,187,180,154,138,176,202,175,188,
 144,143,234,250,190,160,182,179,157,218,155,139,183,184,185,171,
 100,101, 98,102, 99,103,158,104,116,113,114,115,120,117,118,119,
 172,105,237,238,235,239,236,191,128,253,254,251,252,186,174, 89,
  68, 69, 66, 70, 67, 71,156, 72, 84, 81, 82, 83, 88, 85, 86, 87,
 140, 73,205,206,203,207,204,225,112,221,222,219,220,141,142,223
     );
our @E2A = (
   0,  1,  2,  3,156,  9,134,127,151,141,142, 11, 12, 13, 14, 15,
  16, 17, 18, 19,157, 10,  8,135, 24, 25,146,143, 28, 29, 30, 31,
 128,129,130,131,132,133, 23, 27,136,137,138,139,140,  5,  6,  7,
 144,145, 22,147,148,149,150,  4,152,153,154,155, 20, 21,158, 26,
  32,160,226,228,224,225,227,229,231,241,162, 46, 60, 40, 43,124,
  38,233,234,235,232,237,238,239,236,223, 33, 36, 42, 41, 59, 94,
  45, 47,194,196,192,193,195,197,199,209,166, 44, 37, 95, 62, 63,
 248,201,202,203,200,205,206,207,204, 96, 58, 35, 64, 39, 61, 34,
 216, 97, 98, 99,100,101,102,103,104,105,171,187,240,253,254,177,
 176,106,107,108,109,110,111,112,113,114,170,186,230,184,198,164,
 181,126,115,116,117,118,119,120,121,122,161,191,208, 91,222,174,
 172,163,165,183,169,167,182,188,189,190,221,168,175, 93,180,215,
 123, 65, 66, 67, 68, 69, 70, 71, 72, 73,173,244,246,242,243,245,
 125, 74, 75, 76, 77, 78, 79, 80, 81, 82,185,251,252,249,250,255,
  92,247, 83, 84, 85, 86, 87, 88, 89, 90,178,212,214,210,211,213,
  48, 49, 50, 51, 52, 53, 54, 55, 56, 57,179,219,220,217,218,159
     );

if ($_EBCDIC && ord('^') == 106) { # as in the BS2000 posix-bc coded character set
     $A2E[91] = 187;   $A2E[92] = 188;  $A2E[94] = 106;  $A2E[96] = 74;
     $A2E[123] = 251;  $A2E[125] = 253; $A2E[126] = 255; $A2E[159] = 95;
     $A2E[162] = 176;  $A2E[166] = 208; $A2E[168] = 121; $A2E[172] = 186;
     $A2E[175] = 161;  $A2E[217] = 224; $A2E[219] = 221; $A2E[221] = 173;
     $A2E[249] = 192;

     $E2A[74] = 96;   $E2A[95] = 159;  $E2A[106] = 94;  $E2A[121] = 168;
     $E2A[161] = 175; $E2A[173] = 221; $E2A[176] = 162; $E2A[186] = 172;
     $E2A[187] = 91;  $E2A[188] = 92;  $E2A[192] = 249; $E2A[208] = 166;
     $E2A[221] = 219; $E2A[224] = 217; $E2A[251] = 123; $E2A[253] = 125;
     $E2A[255] = 126;
   }
elsif ($_EBCDIC && ord('^') == 176) { # as in codepage 037 on os400
  $A2E[10] = 37;  $A2E[91] = 186;  $A2E[93] = 187; $A2E[94] = 176;
  $A2E[133] = 21; $A2E[168] = 189; $A2E[172] = 95; $A2E[221] = 173;

  $E2A[21] = 133; $E2A[37] = 10;  $E2A[95] = 172; $E2A[173] = 221;
  $E2A[176] = 94; $E2A[186] = 91; $E2A[187] = 93; $E2A[189] = 168;
}

# Smart rearrangement of parameters to allow named parameter
# calling.  We do the rearrangement if:
# the first parameter begins with a -

sub rearrange {
    my ($order,@param) = @_;
    my ($result, $leftover) = _rearrange_params( $order, @param );
    push @$result, make_attributes( $leftover, defined $CGI::Q ? $CGI::Q->{escape} : 1 ) 
    if keys %$leftover;
    @$result;
}

sub rearrange_header {
    my ($order,@param) = @_;

    my ($result,$leftover) = _rearrange_params( $order, @param );
    push @$result, make_attributes( $leftover, 0, 1 ) if keys %$leftover;

    @$result;
}

sub _rearrange_params {
    my($order,@param) = @_;
    return [] unless @param;

    if (ref($param[0]) eq 'HASH') {
    @param = %{$param[0]};
    } else {
    return \@param 
        unless (defined($param[0]) && substr($param[0],0,1) eq '-');
    }

    # map parameters into positional indices
    my ($i,%pos);
    $i = 0;
    foreach (@$order) {
    foreach (ref($_) eq 'ARRAY' ? @$_ : $_) { $pos{lc($_)} = $i; }
    $i++;
    }

    my %params_as_hash = ( @param );

    my (@result,%leftover);
    $#result = $#$order;  # preextend

    foreach my $k (
        # sort keys alphabetically but favour certain keys before others
        # specifically for the case where there could be several options
        # for a param key, but one should be preferred (see GH #155)
        sort {
            if    ( $a =~ /content/i ) { return 1 }
            elsif ( $b =~ /content/i ) { return -1 }
            else  { $a cmp $b }
        }
        keys( %params_as_hash )
    ) {
    my $key = lc($k);
    $key =~ s/^\-//;
    if (exists $pos{$key}) {
        $result[$pos{$key}] = $params_as_hash{$k};
    } else {
        $leftover{$key} = $params_as_hash{$k};
    }
    }

    return \@result, \%leftover;
}

sub make_attributes {
    my $attr = shift;
    return () unless $attr && ref($attr) && ref($attr) eq 'HASH';
    my $escape =  shift || 0;
    my $do_not_quote = shift;

    my $quote = $do_not_quote ? '' : '"';

    my @attr_keys= sort keys %$attr;
    my(@att);
    foreach (@attr_keys) {
    my($key) = $_;
    $key=~s/^\-//;     # get rid of initial - if present

    # old way: breaks EBCDIC!
    # $key=~tr/A-Z_/a-z-/; # parameters are lower case, use dashes

    ($key="\L$key") =~ tr/_/-/; # parameters are lower case, use dashes

    my $value = $escape ? simple_escape($attr->{$_}) : $attr->{$_};
    push(@att,defined($attr->{$_}) ? qq/$key=$quote$value$quote/ : qq/$key/);
    }
    return sort @att;
}

sub simple_escape {
  return unless defined(my $toencode = shift);
  $toencode =~ s{&}{&amp;}gso;
  $toencode =~ s{<}{&lt;}gso;
  $toencode =~ s{>}{&gt;}gso;
  $toencode =~ s{\"}{&quot;}gso;
# Doesn't work.  Can't work.  forget it.
#  $toencode =~ s{\x8b}{&#139;}gso;
#  $toencode =~ s{\x9b}{&#155;}gso;
  $toencode;
}

sub utf8_chr {
    my $c = shift(@_);
    my $u = chr($c);
    utf8::encode($u); # drop utf8 flag
    return $u;
}

# unescape URL-encoded data
sub unescape {
  shift() if @_ > 0 and (ref($_[0]) || (defined $_[1] && $_[0] eq $CGI::DefaultClass));
  my $todecode = shift;
  return undef unless defined($todecode);
  $todecode =~ tr/+/ /;       # pluses become spaces
    if ($_EBCDIC) {
      $todecode =~ s/%([0-9a-fA-F]{2})/chr $A2E[hex($1)]/ge;
    } else {
    # handle surrogate pairs first -- dankogai. Ref: http://unicode.org/faq/utf_bom.html#utf16-2
    $todecode =~ s{
            %u([Dd][89a-bA-B][0-9a-fA-F]{2}) # hi
                %u([Dd][c-fC-F][0-9a-fA-F]{2})   # lo
              }{
              utf8_chr(
                   0x10000 
                   + (hex($1) - 0xD800) * 0x400 
                   + (hex($2) - 0xDC00)
                  )
              }gex;
      $todecode =~ s/%(?:([0-9a-fA-F]{2})|u([0-9a-fA-F]{4}))/
    defined($1)? chr hex($1) : utf8_chr(hex($2))/ge;
    }
  return $todecode;
}

# URL-encode data
#
# We cannot use the %u escapes, they were rejected by W3C, so the official
# way is %XX-escaped utf-8 encoding.
# Naturally, Unicode strings have to be converted to their utf-8 byte
# representation. 
# Byte strings were traditionally used directly as a sequence of octets.
# This worked if they actually represented binary data (i.e. in CGI::Compress).
# This also worked if these byte strings were actually utf-8 encoded; e.g.,
# when the source file used utf-8 without the appropriate "use utf8;".
# This fails if the byte string is actually a Latin 1 encoded string, but it
# was always so and cannot be fixed without breaking the binary data case.
# -- Stepan Kasal <skasal@redhat.com>
#

sub escape {
  # If we being called in an OO-context, discard the first argument.
  shift() if @_ > 1 and ( ref($_[0]) || (defined $_[1] && $_[0] eq $CGI::DefaultClass));
  my $toencode = shift;
  return undef unless defined($toencode);
  utf8::encode($toencode) if utf8::is_utf8($toencode);
    if ($_EBCDIC) {
      $toencode=~s/([^a-zA-Z0-9_.~-])/uc sprintf("%%%02x",$E2A[ord($1)])/eg;
    } else {
      $toencode=~s/([^a-zA-Z0-9_.~-])/uc sprintf("%%%02x",ord($1))/eg;
    }
  return $toencode;
}

# This internal routine creates date strings suitable for use in
# cookies and HTTP headers.  (They differ, unfortunately.)
# Thanks to Mark Fisher for this.
sub expires {
    my($time,$format) = @_;
    $format ||= 'http';

    my(@MON)=qw/Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec/;
    my(@WDAY) = qw/Sun Mon Tue Wed Thu Fri Sat/;

    # pass through preformatted dates for the sake of expire_calc()
    $time = expire_calc($time);
    return $time unless $time =~ /^\d+$/;

    # make HTTP/cookie date string from GMT'ed time
    # (cookies use '-' as date separator, HTTP uses ' ')
    my($sc) = ' ';
    $sc = '-' if $format eq "cookie";
    my($sec,$min,$hour,$mday,$mon,$year,$wday) = gmtime($time);
    $year += 1900;
    return sprintf("%s, %02d$sc%s$sc%04d %02d:%02d:%02d GMT",
                   $WDAY[$wday],$mday,$MON[$mon],$year,$hour,$min,$sec);
}

# This internal routine creates an expires time exactly some number of
# hours from the current time.  It incorporates modifications from 
# Mark Fisher.
sub expire_calc {
    my($time) = @_;
    my(%mult) = ('s'=>1,
                 'm'=>60,
                 'h'=>60*60,
                 'd'=>60*60*24,
                 'M'=>60*60*24*30,
                 'y'=>60*60*24*365);
    # format for time can be in any of the forms...
    # "now" -- expire immediately
    # "+180s" -- in 180 seconds
    # "+2m" -- in 2 minutes
    # "+12h" -- in 12 hours
    # "+1d"  -- in 1 day
    # "+3M"  -- in 3 months
    # "+2y"  -- in 2 years
    # "-3m"  -- 3 minutes ago(!)
    # If you don't supply one of these forms, we assume you are
    # specifying the date yourself
    my($offset);
    if (!$time || (lc($time) eq 'now')) {
      $offset = 0;
    } elsif ($time=~/^\d+/) {
      return $time;
    } elsif ($time=~/^([+-]?(?:\d+|\d*\.\d*))([smhdMy])/) {
      $offset = ($mult{$2} || 1)*$1;
    } else {
      return $time;
    }
    my $cur_time = time; 
    return ($cur_time+$offset);
}

sub ebcdic2ascii {
  my $data = shift;
  $data =~ s/(.)/chr $E2A[ord($1)]/ge;
  $data;
}

sub ascii2ebcdic {
  my $data = shift;
  $data =~ s/(.)/chr $A2E[ord($1)]/ge;
  $data;
}

1;

__END__

=head1 NAME

CGI::Util - Internal utilities used by CGI module

=head1 SYNOPSIS

none

=head1 DESCRIPTION

no public subroutines

=head1 AUTHOR INFORMATION

The CGI.pm distribution is copyright 1995-2007, Lincoln D. Stein. It is
distributed under the Artistic License 2.0. It is currently
maintained by Lee Johnson with help from many contributors.

Address bug reports and comments to: https://github.com/leejo/CGI.pm/issues

The original bug tracker can be found at: https://rt.cpan.org/Public/Dist/Display.html?Queue=CGI