oceanic.js/dist/lib/gateway/compression/zlib-sync.js

A NodeJS library for interfacing with Discord.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const tslib_1 = require("tslib");
const base_1 = tslib_1.__importDefault(require("./base"));
const Errors_1 = require("../../util/Errors");
const zlib_sync_1 = tslib_1.__importDefault(require("zlib-sync"));
class ZlibSyncCompression extends base_1.default {
    _sharedZLib;
    constructor(shard) {
        super(shard);
        this._sharedZLib = new zlib_sync_1.default.Inflate({ chunkSize: 128 * 1024 });
    }
    async decompress(data) {
        if (data.length >= 4 && data.readUInt32BE(data.length - 4) === 0xFFFF) {
            // store the current pointer for slicing buffers after pushing.
            this._sharedZLib.push(data, zlib_sync_1.default.Z_SYNC_FLUSH);
            if (this._sharedZLib.err) {
                this.shard.client.emit("error", new Errors_1.GatewayError(`zlib error ${this._sharedZLib.err}: ${this._sharedZLib.msg ?? ""}`, 0));
                return null;
            }
            data = Buffer.isBuffer(this._sharedZLib.result) ? this._sharedZLib.result : Buffer.from(this._sharedZLib.result ?? "");
            return data;
        }
        else {
            this._sharedZLib.push(data, false);
            return null;
        }
    }
}
exports.default = ZlibSyncCompression;
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