+}
+
+=head2 inventory
+
+ my @tags = inventory;
+
+=cut
+
+sub inventory {
+
+ my @tags;
+
+cmd( 'FE 00 05', 'scan for tags', sub {
+ my $data = shift;
+ my $rest = assert $data => 'FE 00 00 05';
+ my $nr = ord( substr( $rest, 0, 1 ) );
+
+ if ( ! $nr ) {
+ warn "# no tags in range\n";
+ } else {
+ my $tags = substr( $rest, 1 );
+ my $tl = length( $tags );
+ die "wrong length $tl for $nr tags: ",dump( $tags ) if $tl =! $nr * 8;
+
+ foreach ( 0 .. $nr - 1 ) {
+ push @tags, hex_tag substr($tags, $_ * 8, 8);
+ }
+ }
+
+});
+
+ warn "# tags ",dump @tags;
+ return @tags;
+}
+
+
+# 3M defaults: 8,4
+# cards 16, stickers: 8
+my $max_rfid_block = 8;
+my $blocks = 8;
+
+sub _matched {
+ my ( $data, $hex ) = @_;
+ my $b = hex2bytes $hex;
+ my $l = length($b);
+ if ( substr($data,0,$l) eq $b ) {
+ warn "_matched $hex [$l] in ",as_hex($data);
+ return substr($data,$l);
+ }
+}
+
+sub read_blocks {
+ my $tag = shift || confess "no tag?";
+ $tag = shift if ref($tag);
+
+ my $tag_blocks;
+ my $start = 0;
+ cmd(
+ sprintf( "02 $tag %02x %02x", $start, $blocks ) => "read_blocks $tag $start/$blocks", sub {
+ my $data = shift;
+ if ( my $rest = _matched $data => '02 00' ) {
+
+ my $tag = hex_tag substr($rest,0,8);
+ my $blocks = ord(substr($rest,8,1));
+ warn "# response from $tag $blocks blocks ",as_hex substr($rest,9);
+ foreach ( 1 .. $blocks ) {
+ my $pos = ( $_ - 1 ) * 6 + 9;
+ my $nr = unpack('v', substr($rest,$pos,2));
+ my $payload = substr($rest,$pos+2,4);
+ warn "## pos $pos block $nr ",as_hex($payload), $/;
+ $tag_blocks->{$tag}->[$nr] = $payload;
+ }
+ } elsif ( my $rest = _matched $data => 'FE 00 00 05 01' ) {
+ warn "FIXME ready? ",as_hex $test;
+ } elsif ( my $rest = _matched $data => '02 06' ) {
+ warn "ERROR ",as_hex($rest);
+ } else {
+ warn "FIXME unsuported ",as_hex($rest);
+ }
+ });
+
+ warn "# tag_blocks ",dump($tag_blocks);
+ return $tag_blocks;
+}
+
+sub write_blocks {
+ my $tag = shift;
+ $tag = shift if ref $tag;
+ my $data = join('', @_);
+
+ warn "## write_blocks ",dump($tag,$data);
+
+ if ( length($data) % 4 ) {
+ $data .= '\x00' x ( 4 - length($data) % 4 );
+ warn "# padded data to ",dump($data);
+ }
+
+ my $hex_data = as_hex $data;
+ my $blocks = sprintf('%02x', length($data) / 4 );
+
+ cmd(
+ "04 $tag 00 $blocks 00 $hex_data", "write_blocks $tag [$blocks] $hex_data", sub {
+ my $data = shift;
+ if ( my $rest = _matched $data => '04 00' ) {
+ my $tag = substr($rest,0,8);
+ my $blocks = substr($rest,8,1);
+ warn "# WRITE ",as_hex($tag), " [$blocks]\n";
+ } elsif ( my $rest = _matched $data => '04 06' ) {
+ warn "ERROR ",as_hex($rest);
+ } else {
+ die "UNSUPPORTED";
+ }
+ }
+ );
+
+}
+
+sub read_afi {
+ my $tag = shift;
+ $tag = shift if ref $tag;
+
+ my $afi;
+
+ cmd(
+ "0A $tag", "read_afi $tag", sub {
+ my $data = shift;
+
+ if ( my $rest = _matched $data => '0A 00' ) {
+
+ my $tag = substr($rest,0,8);
+ $afi = substr($rest,8,1);
+
+ warn "# SECURITY ", hex_tag($tag), " AFI: ", as_hex($afi);
+
+ } elsif ( my $rest = _matched $data => '0A 06' ) {
+ warn "ERROR reading security from $tag ", as_hex($data);
+ } else {
+ warn "IGNORED ",as_hex($data);
+ }
+ });
+ warn "## read_afi ",dump($tag, $afi);
+ return $afi;
+}
+
+sub write_afi {
+ my $tag = shift;
+ $tag = shift if ref $tag;
+ my $afi = shift || die "no afi?";
+
+ $afi = as_hex $afi;
+
+ cmd(
+ "09 $tag $afi", "write_afi $tag $afi", sub {
+ my $data = shift;
+
+ if ( my $rest = _matched $data => '09 00' ) {
+
+ my $tag = substr($rest,0,8);
+ $afi = substr($rest,8,1);
+
+ warn "# SECURITY ", hex_tag($tag), " AFI: ", as_hex($afi);