From c0ed47f02dddd436fe458361e85da82d324ab1aa Mon Sep 17 00:00:00 2001
From: fishsoupisgood <github@madingley.org>
Date: Wed, 20 Feb 2019 02:39:06 +0000
Subject: support winter time

---
 decode.pl | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/decode.pl b/decode.pl
index 4a7ab27..0bc1151 100755
--- a/decode.pl
+++ b/decode.pl
@@ -74,9 +74,10 @@ sub le_bcd_to_int($) {
 # extract ciphertext and key from three consecutive bit strings
 sub extract($$$) {
     my ( $d0, $d1, $d2 ) = @_;
-
+    
     my $data = "";
     my $key  = "";
+    my $cest = "";
 
     $data .= substr( $d0, 2, 6 );
     $data .= substr( $d0, 9, 6 );
@@ -90,7 +91,9 @@ sub extract($$$) {
     $key .= substr( $d1, 42, 3 );           # day of week
     $key .= substr( $d1, 50, 8 );           # year
 
-    return ( $data, $key );
+    $cest = substr( $d1, 17, 1 );           # cest
+
+    return ( $data, $key, $cest );
 }
 
 ######################################################### CRYPTO
@@ -98,7 +101,7 @@ sub extract($$$) {
 # So this is almost DES with the following changes:
 #
 # 1) There's no initial or final permutation
-# 2) the block size is 40 bits, half blocks are 32bits
+# 2) the block size is 40 bits, half blocks are 20 bits
 # 3) There's no permuted choice 1, permuted choice 2 is different.
 # 4) Rounds 8,7 and 3 have a double rotation for the key
 # 5) The expansion permutation is replaced with a choice followed by catenation.
@@ -437,7 +440,7 @@ my @heavy_lut = (
     'gusts in nighttime',
     'freezing rain during morning',
     'freezing rain during afternoon',
-    'freezing rain  during night',
+    'freezing rain during night',
 
     'dust',
     'ozone',
@@ -711,7 +714,7 @@ while (<DATA>) {
 }
 
 for ( my $i = 0 ; $i < ( $n - 2 ) ; ++$i ) {
-    my ( $data_bits, $key_bits ) =
+    my ( $data_bits, $key_bits,$cest ) =
       extract( $d->[$i], $d->[ $i + 1 ], $d->[ $i + 2 ] );
 
     my $min   = le_bcd_to_int( substr( $key_bits, 0,  8 ) );
@@ -725,6 +728,12 @@ for ( my $i = 0 ; $i < ( $n - 2 ) ; ++$i ) {
 
     next unless ( $mins_since_midnight % 3 ) == 2;
 
+    $mins_since_midnight+=60 if $cest == "0";
+
+    $mins_since_midnight-=1440 while $mins_since_midnight>1440;
+
+
+
     my $plain = decrypt( $data_bits, $key_bits );
 
     next unless defined $plain;
-- 
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