+die "expected 4096 or 1024 bytes, got ",length($card), " bytes\n"
+ unless length $card == 4096 || length $card == 1024;
+
+my ( $ADV, $MA, $DA );
+
+my $pos = 0;
+
+foreach my $sector ( 0 .. 39 ) {
+
+ my $blocks = $sector < 32 ? 4 : 16;
+
+ last if $pos >= length($card);
+ next if substr($card,$pos,$blocks * 0x10) eq "\x00" x ($blocks * 0x10);
+
+ # General purpose byte (GPB)
+ my $GBP = ord(substr($card,0x39,1));
+
+ if ( $sector == 0 ) {
+ printf "manufacturer block\nSerial number: %s\nCB: %s\nmanufacturer data: %s\n"
+ , unpack('H*',substr($card,0,4))
+ , unpack('H*',substr($card,4,1))
+ , unpack('H*',substr($card,5,11))
+ ;
+
+ # MAD
+ $ADV = $GBP & 0b00000011;
+ $MA = $GBP & 0b01000000;
+ $DA = $GBP & 0b10000000;
+ printf "ADV (MAD version code): %d\n", $ADV;
+ printf "MA (multiapplication): %s\n", $MA ? 'yes' : 'monoaplication';
+ printf "DA (MAD available): %s%s\n", $DA ? 'yes' : 'no',
+ substr($card,$pos+0x30,6) eq "\xA0\xA1\xA2\xA3\xA4\xA5" ? ' public' : '';
+
+ printf "Info byte (publisher sector): %x\n", ord(substr($card,0x11,1));
+ } elsif ( $DA ) {
+ my $mad_offset = 0x10 + ( $sector * 2 );
+ my $v = unpack('v',(substr($card, $mad_offset, 2)));
+ my $cluster_id = unpack('HH', (( $v & 0xff00 ) >> 8) );
+ my $full_id = sprintf "%04x",$v;
+ printf "# sector %-2d MAD@%x %04x [%s]\n%s\n", $sector, $mad_offset, $v
+ , $function_clusters->{ $cluster_id }
+ , $mad_id->{$full_id} || "FIXME: add $full_id from MAD_overview.pdf to __DATA__ at end of $0"
+ ;