This is some of my coding..could you comment ?. I read the record length as $length = unpack "C4", substr $data,0,2,'';. is it correct ?
read (DATA, $data, 3);
$tag = unpack "H2", substr $data,0,1,'';
if ($tag =~ /(81|80|00)/) {
# the Record Identifier H’80 is used as Filler record to fill in o
+ne byte
if ($tag == "80") {
$length = 2;
}
# the Record Identifier H’81 is used as Filler record to fill in s
+everal bytes
if ($tag == "81") {
$length = unpack "C4", substr $data,0,2,'';
$length -= 3;
}
# the Record Identifier H’00 is used as Filler record to fill in 3
+2 bytes
if ($tag == "00") {
$length=62;
}
read (DATA, $data, $length);
$raw = unpack "H*", $data;
if ($trace) {
print ("FILLER\n");
printf ("%-20s : %-5s\n", "TAG", $tag);
printf ("%-20s : %-5s\n", "RECORD LENGTH", $length);
print ("RAW DATA : \n$raw\n");
}
}
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