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vcrpp.pl
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#!/usr/bin/perl -w
# Code derived from the C version at <http://www.cryptome.org/vcrpp.c>
# plus improvements
# Yes, this is just translated C code. A perl guru can make it more perlish.
use Tk;
require Tk::BrowseEntry;
my $g_decyear;
my $g_decmonth;
my $g_decday;
my $g_decpluscode;
my $g_decchannel;
my $g_decchannelname;
my $g_decstart;
my $g_decstartm;
my $g_decduration;
my $g_decdurationm;
my $g_encyear;
my $g_encmonth;
my $g_encday;
my $g_encpluscode;
my $g_encchannel;
my $g_encchannelname;
my $g_today_year;
my $g_today_month;
my $g_today_day;
my $i;
my $NDIGITS=10;
$g_encpluscode = "";
$g_encchannel = "2";
$g_encstart = "1900";
$g_encduration = "30";
$g_decpluscode = "3113";
# The following tables belong in the VCRPLUS work section, but
# are here so they get initialized before getting into main.
# This should get fixed when the work routines become a module.
# First, the two (well, three) tables
# Primary table of 4 * 48 = 192 entries
# Index is "magic" from the pluscode
# Value is 24*2*<hour of start> + (0 or 1) half-hours of start +
# half-hours of duration - 1 [= 0-3]) * 48
# for durations = 30, 60, 90, 120 minutes and starts = any half hour 0000-2330
# Also used as a quasi-random number generator in the 7 and 8 digit codes.
my @g_ttbl = (
0x25, 0x20, 0x27, 0x21, 0x1F, 0x23, 0x24, 0x1D,
0x26, 0x52, 0x1C, 0x29, 0x22, 0xB0, 0x28, 0x1E,
0xB8, 0xBA, 0x58, 0xB4, 0x56, 0x5C, 0x5A, 0xAC,
0x4E, 0xBC, 0x17, 0x16, 0x2E, 0x50, 0x8A, 0x2A,
0x19, 0x1B, 0x13, 0x4A, 0x2B, 0x48, 0xA4, 0x54,
0x2C, 0x18, 0x10, 0x11, 0xB2, 0x12, 0x2D, 0x15,
0xB6, 0x0F, 0x5E, 0x44, 0x0E, 0x1A, 0x9E, 0x46,
0x4C, 0x14, 0xA0, 0x2F, 0xAA, 0xA8, 0xA2, 0x0D,
0x84, 0x0C, 0x0B, 0x00, 0xBF, 0x8C, 0x7A, 0x42,
0x81, 0x80, 0x7D, 0x88, 0x85, 0x3C, 0x78, 0x01,
0x93, 0x30, 0x82, 0x90, 0x40, 0x3E, 0xBB, 0x0A,
0x7F, 0xA7, 0xA6, 0x71, 0x8D, 0x72, 0x8B, 0xB1,
0x5F, 0x92, 0x7C, 0x03, 0x97, 0x7E, 0xAE, 0xBE,
0x86, 0x70, 0x09, 0x06, 0xAB, 0x74, 0x6E, 0x02,
0x8F, 0x07, 0x04, 0xBD, 0x08, 0x9C, 0x98, 0x05,
0x6D, 0x31, 0x5D, 0x32, 0x91, 0x8E, 0x51, 0x41,
0x60, 0xB7, 0xA3, 0x89, 0x3A, 0x53, 0x94, 0x87,
0x73, 0xB3, 0x9D, 0x55, 0x4D, 0x77, 0x61, 0xA1,
0x75, 0xAD, 0x62, 0x9F, 0xB9, 0x66, 0x96, 0x7B,
0x79, 0x65, 0x5B, 0x47, 0xB5, 0x3D, 0x3B, 0x34,
0xAF, 0x3F, 0x6C, 0x83, 0x38, 0x6F, 0x69, 0x39,
0x63, 0xA9, 0x33, 0x95, 0x57, 0x36, 0xA5, 0x64,
0x37, 0x9A, 0x43, 0x35, 0x59, 0x68, 0x4F, 0x99,
0x4B, 0x49, 0x67, 0x45, 0x6A, 0x9B, 0x6B, 0x76
);
# Second table controls 7 and 8 digit pluscodes
my @g_LengthEightTable = (
0x14, 0x02, 0x23, 0x03, 0x41, 0x14, 0x14, 0x32,
0x34, 0x03, 0x32, 0x40, 0x10, 0x01, 0x12, 0x32,
0x40, 0x21, 0x24, 0x41, 0x23, 0x14, 0x23, 0x41,
0x02, 0x04, 0x30, 0x24, 0x41, 0x40, 0x01
);
my @g_LengthSevenTable = (
0x03, 0x31, 0x12, 0x12, 0x30, 0x03, 0x03, 0x21,
0x23, 0x12, 0x21, 0x31, 0x03, 0x30, 0x01, 0x21,
0x31, 0x10, 0x13, 0x30, 0x12, 0x03, 0x12, 0x30,
0x31, 0x13, 0x21, 0x13, 0x30, 0x31, 0x30
);
my @inv_ttbl;
# Localize this table with local station names/mapped-channels
my @g_chan_names;
$g_chan_names[ 2] = "WXXA2";
$g_chan_names[ 3] = "WXXB3";
$g_chan_names[ 4] = "WXXC4";
$g_chan_names[ 5] = "WXXD5";
$g_chan_names[ 6] = "WXXE6";
$g_chan_names[ 7] = "WXXF7";
$g_chan_names[ 8] = "WXXG9";
$g_chan_names[ 9] = "WXXH9";
$g_chan_names[10] = "WXXI10";
$g_chan_names[11] = "WXXJ11";
$g_chan_names[12] = "WXXK12";
$g_chan_names[12] = "WXXL13";
$g_chan_names[33] = "HBO";
$g_chan_names[34] = "ESPN";
$g_chan_names[35] = "AMC";
$g_chan_names[37] = "DSC";
$g_chan_names[38] = "NIK";
$g_chan_names[39] = "A&E";
$g_chan_names[41] = "SHO";
$g_chan_names[42] = "CNN";
$g_chan_names[43] = "TBS";
$g_chan_names[44] = "USA";
$g_chan_names[45] = "MAX";
$g_chan_names[46] = "LIF";
$g_chan_names[47] = "FAM";
$g_chan_names[48] = "MTV";
$g_chan_names[49] = "TNN";
$g_chan_names[51] = "TLC";
$g_chan_names[52] = "TNT";
$g_chan_names[53] = "DIS";
$g_chan_names[54] = "BRV";
$g_chan_names[57] = "BET";
$g_chan_names[58] = "TMC";
$g_chan_names[59] = "FSN";
$g_chan_names[62] = "VH1";
$g_chan_names[63] = "E";
$g_chan_names[69] = "H&G";
$g_chan_names[70] = "APL";
$g_chan_names[73] = "HIS";
$g_chan_names[75] = "COM";
$g_chan_names[76] = "TCM";
$g_chan_names[79] = "CNBC";
$g_chan_names[80] = "STARZ";
$g_chan_names[82] = "NEC";
$g_chan_names[85] = "FX";
$g_chan_names[86] = "CRT";
$g_chan_names[89] = "SCI";
$g_chan_names[90] = "MSNBC";
$g_chan_names[91] = "FNC";
$g_chan_names[99] = "QVC";
$g_chan_names[103] ="HAL";
;
# Code starts here
($g_today_year, $g_today_month, $g_today_day) = (localtime) [5,4,3];
$g_today_year += 1900;
$g_today_month += 1;
$g_encyear = $g_today_year;
$g_encmonth = $g_today_month;
$g_encday = $g_today_day;
$g_decyear = $g_today_year;
$g_decmonth = $g_today_month;
$mw = MainWindow->new;
$mw->title("VCRplus+ Decoder/Encoder");
$mw->Label(-text =>"VCRplus+ Decoder/Encoder")->pack(
-side => 'top',
-anchor => 'center');;
$mw->Button(-text => "Quit",
-command => sub {exit})->pack(-side => 'bottom',
-expand => 1,
-fill => 'x');
my $df = $mw->Frame(-borderwidth => 2,
-relief => 'groove')
->pack(-side => 'left',
-anchor => 'n',
-padx => 10,
-pady => 10);
my $ef = $mw->Frame(-borderwidth => 2,
-relief => 'groove')
->pack(-side => 'right',
-anchor => 'n',
-padx => 10,
-pady => 10);
# The Decode frame
$df->Label(-text => "Decode from a Pluscode")
->pack(-side => "top",
-anchor=> 'w');
my $be_d_y = $df->BrowseEntry(
-label => "Year:",
-width => 4,
-variable => \$g_decyear);
foreach $i (1990..2037) {
$be_d_y->insert('end', "$i");
}
$be_d_y->pack(
-side => 'top',
-anchor => 'w');
my $be_d_m = $df->BrowseEntry(
-label => "Month:",
-width => 2,
-variable => \$g_decmonth);
foreach $i (1..12) {
$be_d_m->insert('end', "$i");
}
$be_d_m->pack(
-side => 'top',
-expand => 1,
-anchor => 'w');
my $df1 = $df->Frame(-borderwidth => 2,
-relief => 'groove')
->pack(-side => 'top',
-expand => 1,
-anchor => 'w');
$df->Button(-text => "Decode",
-command => \&do_decode_gui )->pack(-side => 'top',
-pady => 10);
my $df2 = $df->Frame(-borderwidth => 2,
-relief => 'groove')
->pack(-side => 'top',
-expand => 1,
-anchor => 'w');
my $df3 = $df->Frame(-borderwidth => 2,
-relief => 'groove')
->pack(-side => 'top',
-expand => 1,
-anchor => 'w');
my $df4 = $df->Frame(-borderwidth => 2,
-relief => 'groove')
->pack(-side => 'top',
-expand => 1,
-anchor => 'w');
my $df5 = $df->Frame(-borderwidth => 2,
-relief => 'groove')
->pack(-side => 'top',
-expand => 1,
-anchor => 'w');
my $df6 = $df->Frame(-borderwidth => 2,
-relief => 'groove')
->pack(-side => 'top',
-expand => 1,
-anchor => 'w');
my $lab_d_pc = $df1->Label(
-text => "PlusCode:")->pack(
-side => "left",
-expand => 1,
-anchor=> 'w');
my $ent_d_pc = $df1->Entry(
-width => 8,
-textvariable => \$g_decpluscode)->pack(
-side => 'right',
-expand => 1,
-anchor => 'e');
my $lab_d_ch = $df2->Label(-text => "Channel:")->pack(-side => "left", -anchor=> 'w');
my $ent_d_ch = $df2->Entry(
-width => 3,
-textvariable => \$g_decchannel)->pack(
-side => 'right',
-expand => 1,
-anchor => 'e');
my $lab_d_chnam = $df3->Label(-text => "Channel Name:")->pack(-side => "left", -anchor=> 'w');
my $ent_d_chnam = $df3->Entry(
-width => 8,
-textvariable => \$g_decchannelname)->pack(
-side => 'right',
-expand => 1,
-anchor => 'e');
my $lab_d_day = $df4->Label(-text => "Day:")->pack(-side => "left", -anchor=> 'w');
my $ent_d_day = $df4->Entry(
-width => 2,
-textvariable => \$g_decday)->pack(
-side => 'right',
-expand => 1,
-anchor => 'e');
my $lab_d_start = $df5->Label(-text => "Start (hhmm):")->pack(-side => "left", -anchor=> 'w');
my $ent_d_start = $df5->Entry(
-width => 4,
-textvariable => \$g_decstart)->pack(
-side => 'right',
-expand => 1,
-anchor => 'e');
my $lab_d_duration = $df6->Label(-text => "Duration (hmm):")->pack(-side => "left", -anchor=> 'w');
my $ent_d_duration = $df6->Entry(
-width => 3,
-textvariable => \$g_decduration)->pack(
-side => 'right',
-expand => 1,
-anchor => 'e');
# The Encode frame
$ef->Label(-text => "Encode to a Pluscode")->pack(-side => "top", -anchor=> 'n');
my $ef1 = $ef->Frame(-borderwidth => 2,
-relief => 'groove')
->pack(-side => 'top',
-expand => 1,
-anchor => 'w');
my $ef2 = $ef->Frame(-borderwidth => 2,
-relief => 'groove')
->pack(-side => 'top',
-expand => 1,
-anchor => 'w');
my $ef3 = $ef->Frame(-borderwidth => 2,
-relief => 'groove')
->pack(-side => 'top',
-expand => 1,
-anchor => 'w');
my $ef4 = $ef->Frame(-borderwidth => 2,
-relief => 'groove')
->pack(-side => 'top',
-expand => 1,
-anchor => 'w');
my $ef5 = $ef->Frame(-borderwidth => 2,
-relief => 'groove')
->pack(-side => 'top',
-expand => 1,
-anchor => 'w');
my $be_e_ch = $ef->BrowseEntry(
-label => "Channel:",
-width => 3,
-variable => \$g_encchannel);
foreach $i (1..127) {
$be_e_ch->insert('end', "$i");
}
$be_e_ch->pack(
-side => 'top',
-anchor => 'w');
$ef->Button(-text => "Encode",
-command => \&do_encode_gui )->pack(-side => 'top',
-pady => 10);
my $ef6 = $ef->Frame(-borderwidth => 2,
-relief => 'groove')
->pack(-side => 'top',
-expand => 1,
-anchor => 'w');
my $lab_e_pc = $ef6->Label(
-text => "PlusCode:")->pack(
-side => "left",
-expand => 1,
-anchor=> 'w');
my $ent_e_pc = $ef6->Entry(
-width => 8,
-textvariable => \$g_encpluscode)->pack(
-side => 'right',
-expand => 1,
-anchor => 'e');
my $be_e_y = $ef1->BrowseEntry(
-label => "Year:",
-width => 4,
-variable => \$g_encyear);
foreach $i (1990..2037) {
$be_e_y->insert('end', "$i");
}
$be_e_y->pack(
-side => 'top',
-anchor => 'w');
my $be_e_m = $ef2->BrowseEntry(
-label => "Month:",
-width => 2,
-variable => \$g_encmonth);
foreach $i (1..12) {
$be_e_m->insert('end', "$i");
}
$be_e_m->pack(
-side => 'top',
-anchor => 'w');
my $be_e_d = $ef3->BrowseEntry(
-label => "Day:",
-width => 2,
-variable => \$g_encday);
foreach $i (1..31) {
$be_e_d->insert('end', "$i");
}
$be_e_d->pack(
-side => 'top',
-anchor => 'w');
my $lab_e_start = $ef4->Label(-text => "Start (hhmm):")->pack(-side => "left", -anchor=> 'w');
my $ent_e_start = $ef4->Entry(
-width => 4,
-textvariable => \$g_encstart)->pack(
-side => 'right',
-expand => 1,
-anchor => 'e');
my $lab_e_duration = $ef5->Label(-text => "Duration (hmm):")->pack(-side => "left", -anchor=> 'w');
my $ent_e_duration = $ef5->Entry(
-width => 3,
-textvariable => \$g_encduration)->pack(
-side => 'right',
-expand => 1,
-anchor => 'e');
$ent_d_pc->focus;
MainLoop;
# Above is all the GUI stuff. The VCRPLUS logic follows.
# Here are the real work routines, taking args and returning
# results as per the usual subroutine interface.
# This is what should be split off into a module.
# Glue routines to move args/vals from/to globals
sub do_decode_gui {
($g_decday, $g_decstartm, $g_decdurationm, $g_decchannel) =
vcrpp_decode($g_decyear, $g_decmonth, $g_decpluscode);
$g_decstart = (100 * (int ($g_decstartm / 60))) +
($g_decstartm % 60);
$g_decduration = (100 * (int ($g_decdurationm / 60))) +
($g_decdurationm % 60);
# Report name of channel, if known
$g_decchannelname = ("Ch " . $g_decchannel);
if ($g_chan_names[$g_decchannel]) {
$g_decchannelname = $g_chan_names[$g_decchannel];
}
}
sub do_encode_gui {
$g_encpluscode =
vcrpp_encode($g_encyear, $g_encmonth, $g_encday,
$g_encstart, $g_encduration, $g_encchannel);
}
#******************************************************************
#* Utility routines
#******************************************************************
sub
count_digits()
{
my $val;
my $ndigits;
($val) = @_;
if ($val < 1) {$ndigits = 0}
elsif ($val < 10) {$ndigits = 1}
elsif ($val < 100) {$ndigits = 2}
elsif ($val < 1000) {$ndigits = 3}
elsif ($val < 10000) {$ndigits = 4}
elsif ($val < 100000) {$ndigits = 5}
elsif ($val < 1000000) {$ndigits = 6}
elsif ($val < 10000000) {$ndigits = 7}
else {$ndigits = 8};
$ndigits;
}
sub
set_pwr()
{
my $ndigits = $_;
my $pwr = 0x7fffffff;
if (0 == $ndigits) {$pwr = 1};
if (1 == $ndigits) {$pwr = 10};
if (2 == $ndigits) {$pwr = 100};
if (3 == $ndigits) {$pwr = 1000};
if (4 == $ndigits) {$pwr = 10000};
if (5 == $ndigits) {$pwr = 100000};
if (6 == $ndigits) {$pwr = 10000000};
if (7 == $ndigits) {$pwr = 100000000};
if (8 == $ndigits) {$pwr = 1000000000};
if (9 == $ndigits) {$pwr = 10000000000};
$pwr;
}
# Split the code into an array of digits, lsb at low index
sub
split_digits()
{
my $n;
my @a;
my $aref;
($n, $aref) = @_;
my $i;
my $digit;;
for ($i = 0; $i < $NDIGITS; $i++) {
$$aref[$i] = 0;
}
for ($i = 0; $i < $NDIGITS; $i++) {
$digit = $n % 10;
$$aref[$i] = $digit;
$n = ($n - $digit) / 10;
}
}
# Inverse of the decoder's initial transform. For encoder.
sub
encfunc1 ()
{
#input/output
my $val;
#locals
my $ndigits;
my $pwr;
($val) = @_;
$ndigits = 0;
$pwr = 1;
while ($val >= $pwr) {
$ndigits++;
$pwr *= 10;
}
if ($ndigits > 8) {
return 0;
}
$pwr /= 10;
do {
$val = &encode_final_transform($val, 9371) % ($pwr * 10);
} while ($val < $pwr);
return ($val);
}
sub
twiddle_tt()
{
#input
my $tt;
#outputs
my $t;
my $d;
my $x1;
my $x2;
# locals
my $t1;
my $t2;
my $b;
$tt = $_[0];
$x1 = 0;
$x2 = 0;
$t1 = 0;
$t1 = 0;
$d = 0;
$t = 0;
$b = 0;
if (($tt >= 768) && ($tt <= 3647)) {
$t1 = (($tt - 768) % 10) + 1;
$t2 = $t1 * 5;
if ($t1 >= 6) {
$x2 = $t2 - 25;
} else {
$x1 = $t2;
}
$tt -= 768;
$tt = int ($tt / 10);
}
elsif (($tt >= 3648) && ($tt <= 6527)) {
$t1 = (($tt - 3648) % 6) + 1;
if ($t1 == 1) {
$x1 = 15;
} else {
$x2 = (5 * $t1) - 5;
}
$tt = int (($tt - 3648) / 6) + 288;
}
elsif (($tt > 6527) && ($tt <= 13727)) {
$x1 = 5 + (((($tt-6528) % 25) % 5) * 5);
$x2 = 5 + (int((($tt-6528) % 25) / 5) * 5);
$tt -= 6528;
$tt = int ($tt / 25);
}
elsif ($tt > 13727) {
$x2 = 5 + ((($tt - 13728) % 5) * 5);
$x1 = 15;
$tt -= 13728;
$tt = int ($tt / 5) + 288;
}
if ($tt < 192) {
# Lookup in table
$b = $g_ttbl[$tt];
$t = $b % 48; # Half hours after midnight
$d = int ($b / 48); # Half hours of duration - 1
} else {
$t = 47 - (($tt - 192) % 48); # Half hours after midnight
$d = int ($tt / 48); # Half hours of duration - 1
}
@_ = ($t, $d, $x1, $x2);
}
sub
interleave ()
{
#inputs
my $tval;
my $cval;
($tval, $cval) = @_;
#outputs
my $top5 = 0;
my $bot3 = 0;
if ($tval & (1 << 0)) {($bot3 |= (1 << 0))};
if ($cval & (1 << 0)) {($bot3 |= (1 << 1))};
if ($tval & (1 << 1)) {($bot3 |= (1 << 2))};
if ($cval & (1 << 1)) {($bot3 |= (1 << 3))};
if ($tval & (1 << 2)) {($bot3 |= (1 << 4))};
if ($tval & (1 << 3)) {($top5 |= (1 << 0))};
if ($cval & (1 << 2)) {($top5 |= (1 << 1))};
if ($cval & (1 << 3)) {($top5 |= (1 << 2))};
if ($tval & (1 << 4)) {($top5 |= (1 << 3))};
if ($tval & (1 << 5)) {($top5 |= (1 << 4))};
if ($tval & (1 << 6)) {($top5 |= (1 << 5))};
if ($cval & (1 << 4)) {($top5 |= (1 << 6))};
if ($tval & (1 << 7)) {($top5 |= (1 << 7))};
if ($cval & (1 << 5)) {($top5 |= (1 << 8))};
if ($tval & (1 << 8)) {($top5 |= (1 << 9))};
if ($tval & (1 << 9)) {($top5 |= (1 << 10))};
if ($tval & (1 << 10)) {($top5 |= (1 << 11))};
if ($cval & (1 << 6)) {($top5 |= (1 << 12))};
if ($tval & (1 << 11)) {($top5 |= (1 << 13))};
if ($tval & (1 << 12)) {($top5 |= (1 << 14))};
if ($tval & (1 << 13)) {($top5 |= (1 << 15))};
if ($cval & (1 << 7)) {($top5 |= (1 << 16))};
# Untested below. Channels over 127.
if ($top5 & (1 << 16)) {
if ($tval & (1 << 11)) {($top5 |= (1 << 12))};
if ($tval & (1 << 12)) {($top5 |= (1 << 13))};
if ($tval & (1 << 13)) {($top5 |= (1 << 14))};
if ($cval & (1 << 6)) {($top5 |= (1 << 15))};
}
# Untested above. Channels over 127.
# Return shuffled bits
@_ = ($top5, $bot3);
}
sub
inv_twiddle_tt(int startm, int durnm)
{
#inputs
my $startm;
my $durnm;
#output
my $tt = 0;;
#locals
my $x1 = 0;
my $x2 = 0;
my $t1 = 0;
my $t2 = 0;
my $t = 0;
my $d = 0;
my $b = 0;
my $i = 0;
my $bstart = 0;
my $bdurn = 0;
my $basett = 0;
($startm, $durnm) = @_;
if (($durnm < 5) ||
($durnm > (60*8)) ||
($startm < 0) ||
($startm > (23*60)+59) ) {
return (-1);
}
if ($durnm % 5) { $durnm = $durnm + 5 - ($durnm % 5); }
if ($durnm > (8 * 60)) { $durnm = 8 * 60; }
if ($startm % 5) { $startm = $startm - ($startm % 5); }
$bstart = $startm - ($startm % 30);
$bdurn = $durnm + 29;
$bdurn = $bdurn - ($bdurn % 30);
$t = int($bstart / 30);
$d = int($bdurn / 30);
$x1 = $bdurn - $durnm;
$x2 = $startm - $bstart;
if ($d <= 4) {
for ($i = 0; $i < 192; $i++) {
$basett = $i;
last if ($g_ttbl[$i] == ($t + (($d - 1) * 48)));
}
} else {
$basett = (48 * ($d - 1)) + 47 - $t;
}
if (($x1 == 0) && ($x2 == 0)) {
return $basett;
}
elsif (($d <= 6) && (($x1 == 0) || ($x2 == 0))) {
$tt = 768 + (10 * $basett);
if ($x1) {
$tt += int($x1 / 5) - 1;
}
elsif ($x2) {
$tt += int($x2 / 5) + 4;
}
return $tt;
}
elsif (($d > 6) && ( (($x1 == 15) && ($x2 == 0)) ||
(($x1 == 0) && ($x2 != 0)) ) ) {
$tt = 3648 + (6 * ($basett - 288));
$tt += int($x2 / 5);
return $tt;
}
elsif (($d <= 6) && ($x1) && ($x2)) {
$tt = 6528 + (25 * $basett);
$tt += int($x1 / 5) - 1;
$tt += (int($x2 / 5) - 1) * 5;
return $tt;
}
elsif (($d > 6) && ($x1) && ($x2)) {
$tt = 13728 + (5 * ($basett - 288));
$tt += int($x2 / 5) - 1;
return $tt;
}
return -1;
}
sub
map_top()
{
#inputs
my $year;
my $month;
my $day;
my $top5;
my $rem;
#outputs
my $mtout;
my $remout;
#locals
my $year_mod16;
my $year_mod100;
my $ndigits;
my $nd;
my $j;
my $k;
my $t1;
my $t2;
my $t3;
my $ym;
my $datum;
my $year_today;
my @n;
my $nref;
($year, $month, $day, $top5, $rem) = @_;
$nref = \@n;
$year_today = $year;
$year_mod100 = $year % 100;
$year_mod16 = $year_mod100 % 16;
&split_digits($top5, $nref);
$ndigits = &count_digits($top5) + 3;
$nd = $ndigits - 3 - 1;
$rem = ($rem + $n[0] + $n[1] + $n[2] + $n[3] + $n[4]) & 0x1f;
if ($ndigits <= 6) {
if ($nd >= 0) {
do {
$k = 0;
do {
$n[$nd] = ($n[$nd] + $day) % 10;
if ($nd > 0) {
for ($j = $nd - 1; $j >= 0; $j--) {
$n[$j] = ($n[$j] + $n[$j+1]) % 10;
}
}
$rem += $n[0];
} while (++$k <= $year_mod16);
} while ($n[$nd] == 0);
}
$rem = ($rem + ($day * ($month + 1))) & 0x1f;
} else { # ndigits > 6
$ym = ($year_mod100 * 12) + $month; # 1 to 1200
do {
$k = 1;
do {
$t1 = ($ym + 310 - $k) % 31;
$t1 = ($ndigits == 7) ?
$g_LengthSevenTable[$t1] : $g_LengthEightTable[$t1];
$t2 = ($t1 & 0x0f);
$t3 = (($t1 >> 4) & 0x0f);
$t1 = $n[$t2] + (10 * $n[$t3]);
do {
$t1 = ($g_ttbl[$t1] - $ym + 1920) % 192;
} while ($t1 > 99);
$n[$t2] = $t1 % 10;
$n[$t3] = int ($t1 / 10);
} while (++$k <= 31);
} while ($n[$nd] == 0);
}
$mtout = 10000*$n[4] + 1000*$n[3] + 100*$n[2] + 10*$n[1] + $n[0];
@_ = ($mtout, $rem);
}
sub
inv_map_top(year, month, day, top5)
{
#inputs
my $year;
my $month;
my $day;
my $top5;
# output
my $mtout;
#locals
my $year_mod16;
my $year_mod100;
my $ndigits;
my $nd;
my $i;
my $j;
my $k;
my $t1;
my $t2;
my $t3;
my $ym;
my @n;
my $nref;
($year, $month, $day, $top5) = @_;
$nref = \@n;
$year_mod100 = $year % 100;
$year_mod16 = $year_mod100 % 16;
&split_digits($top5, $nref);
$ndigits = &count_digits($top5) + 3;
$nd = $ndigits - 3 - 1;
SWITCH: {
if (($ndigits >= 0) && ($ndigits <= 3)) {
$mtout = $top5;
last SWITCH;
}
elsif (($ndigits >= 4) && ($ndigits <= 6)) {
do {
$k = 0;
do {
if ($nd > 0) {
for ($j = 0; $j < $nd; $j++) {
$n[$j] = ($n[$j] + 100 - $n[$j+1]) % 10;
}
}
$n[$nd] = ($n[$nd] + 100 - $day) % 10;
} while (++$k <= $year_mod16);
} while ($n[$nd] == 0);
$mtout = 10000*$n[4] + 1000*$n[3] + 100*$n[2] + 10*$n[1] + $n[0];
last SWITCH;
}
elsif (($ndigits >= 7) && ($ndigits <= 8)) {
$ym = ($year_mod100 * 12) + $month; # 1 through 1200
for ($i = 0; $i < 100; $i++) {
$j = $i;
do {
$j = ($g_ttbl[$j] - $ym + 1920) % 192;
} while ($j > 99);
$inv_ttbl[$j] = $i;
}
do {
$k = 31;
do {
$t1 = ($ym + 310 - $k) % 31;
$t1 = ($ndigits == 7) ?
$g_LengthSevenTable[$t1] : $g_LengthEightTable[$t1];
$t2 = ($t1 & 0x0f);
$t3 = (($t1 >> 4) & 0x0f);
$t1 = $n[$t2] + (10 * $n[$t3]);
$t1 = $inv_ttbl[$t1];
$n[$t2] = $t1 % 10;
$n[$t3] = int($t1 / 10);
} while (--$k >= 1);
} while ($n[$nd] == 0);
$mtout = 10000*$n[4] + 1000*$n[3] + 100*$n[2] + 10*$n[1] + $n[0];
last SWITCH;
}
else {
$mtout = (-1);
last SWITCH;
}
}
return $mtout;
}
sub