CODEWITHSUNDEEP
node.jstcp
majidarif
majidarif

Reputation: 19975

nodejs packet parser structure

I have a packet, when viewed in hex is:

0A 00 2C 01 23 00 0C 00 B3 01

0A 00 is the length which is 10.
2C 01 is a identifier 12c or could be a decimal packet id.
23 00 is a version of dec 35.
0C 00 is another version which is dec 12.
b3 01 is 435.

Now I am using packet for nodejs.

http://bigeasy.github.io/node-packet/

I currently have this code,

parser.extract("b16 => length, b16 => id, b16 => clientVersion, b16 => updateVersion, b16 => dateVersion", function (record) {
  console.log(record);
});
parser.parse(data);

These are the issues here, the extract returns

length: 2560, version: 11265... etc. ( which is all wrong )

Question is what is going wrong?

changing everything to b8 still gives me the correct length which is 10 but everything else is still wrong.

Upvotes: 0

Views: 900

Answers (1)

loganfsmyth
loganfsmyth

Reputation: 161447

You have specified the Endianness of your values incorrectly. 0A 00 is 10 in little-endian form, but you have specified it as b16 (the b meaning big-endian).

parser.extract(
    "l16 => length, " +
    "l16 => id, " +
    "l16 => clientVersion, " +
    "l16 => updateVersion, " +
    "l16 => dateVersion",
    function (record) {

Upvotes: 1

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