@ensdomains/root/lib/dns.js

[](https://travis-ci.com/ensdomains/root) [](LICENSE)

var exports = module.exports = {};

const TYPE_TXT = exports.TYPE_TXT = 16;
const TYPE_DNSKEY = exports.TYPE_DNSKEY = 48;
const TYPE_DS = exports.TYPE_DS = 43;
const CLASS_INET = exports.CLASS_INET = 1;

// @TODO REMOVE

var encodeName = exports.encodeName = function(buf, off, name) {
    if(!name.endsWith(".")) name = name + ".";
    if(name == ".") {
        buf.writeUInt8(0, off++);
        return off;
    }

    for(var part of name.split(".")) {
        buf.writeUInt8(part.length, off++);
        buf.write(part, off)
        off += part.length;
    }
    return off;
}

var hexEncodeName = exports.hexEncodeName = function(name) {
    var buf = new Buffer(name.length + 1);
    var off = encodeName(buf, 0, name);
    return "0x" + buf.toString("hex", 0, off);
}

var encodeRRHeader = exports.encodeRRHeader = function(buf, off, header) {
    off = encodeName(buf, off, header.name);
    buf.writeUInt16BE(header.type, off); off += 2;
    buf.writeUInt16BE(header.klass, off); off += 2;
    buf.writeUInt32BE(header.ttl, off); off += 4;
    return off;
}

var encodeTXT = exports.encodeTXT = function(buf, off, rec) {
    rec.type = TYPE_TXT;
    off = encodeRRHeader(buf, off, rec);
    var totalLen = rec.text.map((x) => x.length + 1).reduce((a, b) => a + b);
    buf.writeUInt16BE(totalLen, off); off += 2;
    for(var part of rec.text) {
        buf.writeUInt8(part.length, off); off += 1;
        buf.write(part, off); off += part.length;
    }
    return off;
}

var hexEncodeTXT = exports.hexEncodeTXT = function(rec) {
    var buf = new Buffer(4096);
    var off = encodeTXT(buf, 0, rec);
    return "0x" + buf.toString("hex", 0, off);
}