dns-packet-typescript/dist/rtxt.js

An abstract-encoding compliant module for encoding / decoding DNS packets

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.encodingLength = exports.decode = exports.encode = void 0;
function encode(data, buf, offset) {
    if (offset === void 0) { offset = 0; }
    if (!Array.isArray(data))
        data = [data];
    for (var i = 0; i < data.length; i++) {
        if (typeof data[i] === 'string') {
            data[i] = Buffer.from(data[i]);
        }
        if (!Buffer.isBuffer(data[i])) {
            throw new Error('Must be a Buffer');
        }
    }
    // just a hack for type
    var _data = data;
    if (!buf)
        buf = Buffer.allocUnsafe(encodingLength(_data));
    if (!offset)
        offset = 0;
    var oldOffset = offset;
    offset += 2;
    _data.forEach(function (d) {
        buf[offset++] = d.length;
        d.copy(buf, offset, 0, d.length);
        offset += d.length;
    });
    buf.writeUInt16BE(offset - oldOffset - 2, oldOffset);
    encode.bytes = offset - oldOffset;
    return buf;
}
exports.encode = encode;
encode.bytes = 0;
function decode(buf, offset) {
    if (offset === void 0) { offset = 0; }
    if (!offset)
        offset = 0;
    var oldOffset = offset;
    var remaining = buf.readUInt16BE(offset);
    offset += 2;
    var data = [];
    while (remaining > 0) {
        var len = buf[offset++];
        --remaining;
        if (remaining < len) {
            throw new Error('Buffer overflow');
        }
        data.push(buf.slice(offset, offset + len));
        offset += len;
        remaining -= len;
    }
    decode.bytes = offset - oldOffset;
    return data;
}
exports.decode = decode;
decode.bytes = 0;
function encodingLength(data) {
    if (!Array.isArray(data))
        data = [data];
    var length = 2;
    data.forEach(function (buf) {
        if (typeof buf === 'string') {
            length += Buffer.byteLength(buf) + 1;
        }
        else {
            length += buf.length + 1;
        }
    });
    return length;
}
exports.encodingLength = encodingLength;
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