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/// import
import { Buffer } from "node:buffer";
/// util
import { NOT_QU_MASK, QU_MASK } from "./utility/constants.ts";import { Name } from "./name.ts";import * as classes from "./utility/classes.ts";import * as types from "./utility/types.ts";


/// export
export class Question {  decodeBytes = 0;  encodeBytes = 0;
  decode(buf, offset?) {    if (!offset)      offset = 0;
    const name = new Name();    const oldOffset = offset;    const q: { [key: string]: unknown; } = {};
    q.name = name.decode(buf, offset);    offset += name.decodeBytes;    q.type = types.toString(buf.readUInt16BE(offset));    offset += 2;    q.class = classes.toString(buf.readUInt16BE(offset));    offset += 2;
    const qu = !!(Number(q.class) & QU_MASK);
    if (qu) // `q.class &= NOT_QU_MASK` is equivalent to `q.class = q.class & NOT_QU_MASK`.      q.class = Number(q.class) & NOT_QU_MASK;
    this.decodeBytes = offset - oldOffset;    return q;  }
  encode(q, buf?, offset?) {    if (!buf)      buf = Buffer.alloc(this.encodingLength(q));
    if (!offset)      offset = 0;
    const name = new Name();    const oldOffset = offset;
    name.encode(q.name, buf, offset);    offset += name.encodeBytes;    buf.writeUInt16BE(types.toType(q.type), offset);    offset += 2;    buf.writeUInt16BE(classes.toClass(q.class === undefined ? "IN" : q.class), offset);    offset += 2;
    this.encodeBytes = offset - oldOffset;    return q;  }
  encodingLength(q) {    const name = new Name();    return name.encodingLength(q.name) + 4;  }}