spb/admin-ka

1/*2 * noVNC: HTML5 VNC client3 * Copyright (C) 2020 The noVNC authors4 * Licensed under MPL 2.0 (see LICENSE.txt)5 *6 * See README.md for usage and integration instructions.7 */89import { deflateInit, deflate } from "../vendor/pako/lib/zlib/deflate.js";10import { Z_FULL_FLUSH, Z_DEFAULT_COMPRESSION } from "../vendor/pako/lib/zlib/deflate.js";11import ZStream from "../vendor/pako/lib/zlib/zstream.js";1213export default class Deflator {14    constructor() {15        this.strm = new ZStream();16        this.chunkSize = 1024 * 10 * 10;17        this.outputBuffer = new Uint8Array(this.chunkSize);1819        deflateInit(this.strm, Z_DEFAULT_COMPRESSION);20    }2122    deflate(inData) {23        /* eslint-disable camelcase */24        this.strm.input = inData;25        this.strm.avail_in = this.strm.input.length;26        this.strm.next_in = 0;27        this.strm.output = this.outputBuffer;28        this.strm.avail_out = this.chunkSize;29        this.strm.next_out = 0;30        /* eslint-enable camelcase */3132        let lastRet = deflate(this.strm, Z_FULL_FLUSH);33        let outData = new Uint8Array(this.strm.output.buffer, 0, this.strm.next_out);3435        if (lastRet < 0) {36            throw new Error("zlib deflate failed");37        }3839        if (this.strm.avail_in > 0) {40            // Read chunks until done4142            let chunks = [outData];43            let totalLen = outData.length;44            do {45                /* eslint-disable camelcase */46                this.strm.output = new Uint8Array(this.chunkSize);47                this.strm.next_out = 0;48                this.strm.avail_out = this.chunkSize;49                /* eslint-enable camelcase */5051                lastRet = deflate(this.strm, Z_FULL_FLUSH);5253                if (lastRet < 0) {54                    throw new Error("zlib deflate failed");55                }5657                let chunk = new Uint8Array(this.strm.output.buffer, 0, this.strm.next_out);58                totalLen += chunk.length;59                chunks.push(chunk);60            } while (this.strm.avail_in > 0);6162            // Combine chunks into a single data6364            let newData = new Uint8Array(totalLen);65            let offset = 0;6667            for (let i = 0; i < chunks.length; i++) {68                newData.set(chunks[i], offset);69                offset += chunks[i].length;70            }7172            outData = newData;73        }7475        /* eslint-disable camelcase */76        this.strm.input = null;77        this.strm.avail_in = 0;78        this.strm.next_in = 0;79        /* eslint-enable camelcase */8081        return outData;82    }8384}85