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/*
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* https://github.com/morethanwords/tweb
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* Copyright (C) 2019-2021 Eduard Kuzmenko
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* https://github.com/morethanwords/tweb/blob/master/LICENSE
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*/
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//import { bytesFromHex, addPadding } from "../../bin_utils";
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import { Codec } from "./codec";
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class AbridgedPacketCodec implements Codec {
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public tag = 0xef;
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public obfuscateTag = new Uint8Array([this.tag, this.tag, this.tag, this.tag]);
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public encodePacket(data: Uint8Array) {
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const len = data.byteLength >> 2;
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let header: Uint8Array;
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if(len < 127) {
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header = new Uint8Array([len]);
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} else { // Length: payload length, divided by four, and encoded as 3 length bytes (little endian)
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//header = new Uint8Array([0x7f, ...addPadding(bytesFromHex(len.toString(16)).reverse(), 3, true)/* .reverse() */]);
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header = new Uint8Array([0x7f, len & 0xFF, (len >> 8) & 0xFF, (len >> 16) & 0xFF]);
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//console.log('got nobody cause im braindead', header, len);
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}
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return header.concat(data);
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//return new Uint8Array([...header, ...data]);
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}
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public readPacket(data: Uint8Array) {
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let length = data[0];
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if(length >= 127) { // 0x7f
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length = data[1] | (data[2] << 8) | (data[3] << 16);
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return data.slice(4, length << 2 + 1); // need +1
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}
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return data.slice(1, length << 2 + 1); // need +1
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}
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}
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export default new AbridgedPacketCodec();
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