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1 | /* |
2 | * noVNC: HTML5 VNC client | |
3 | * Copyright (C) 2020 The noVNC Authors | |
4 | * Licensed under MPL 2.0 (see LICENSE.txt) | |
5 | * | |
6 | * See README.md for usage and integration instructions. | |
7 | */ | |
8 | ||
9 | import { deflateInit, deflate } from "../vendor/pako/lib/zlib/deflate.js"; | |
10 | import { Z_FULL_FLUSH } from "../vendor/pako/lib/zlib/deflate.js"; | |
11 | import ZStream from "../vendor/pako/lib/zlib/zstream.js"; | |
12 | ||
13 | export default class Deflator { | |
14 | constructor() { | |
15 | this.strm = new ZStream(); | |
16 | this.chunkSize = 1024 * 10 * 10; | |
17 | this.outputBuffer = new Uint8Array(this.chunkSize); | |
18 | this.windowBits = 5; | |
19 | ||
20 | deflateInit(this.strm, this.windowBits); | |
21 | } | |
22 | ||
23 | deflate(inData) { | |
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 | ||
31 | let lastRet = deflate(this.strm, Z_FULL_FLUSH); | |
32 | let outData = new Uint8Array(this.strm.output.buffer, 0, this.strm.next_out); | |
33 | ||
34 | if (lastRet < 0) { | |
35 | throw new Error("zlib deflate failed"); | |
36 | } | |
37 | ||
38 | if (this.strm.avail_in > 0) { | |
39 | // Read chunks until done | |
40 | ||
41 | let chunks = [outData]; | |
42 | let totalLen = outData.length; | |
43 | do { | |
44 | this.strm.output = new Uint8Array(this.chunkSize); | |
45 | this.strm.next_out = 0; | |
46 | this.strm.avail_out = this.chunkSize; | |
47 | ||
48 | lastRet = deflate(this.strm, Z_FULL_FLUSH); | |
49 | ||
50 | if (lastRet < 0) { | |
51 | throw new Error("zlib deflate failed"); | |
52 | } | |
53 | ||
54 | let chunk = new Uint8Array(this.strm.output.buffer, 0, this.strm.next_out); | |
55 | totalLen += chunk.length; | |
56 | chunks.push(chunk); | |
57 | } while (this.strm.avail_in > 0); | |
58 | ||
59 | // Combine chunks into a single data | |
60 | ||
61 | let newData = new Uint8Array(totalLen); | |
62 | let offset = 0; | |
63 | ||
64 | for (let i = 0; i < chunks.length; i++) { | |
65 | newData.set(chunks[i], offset); | |
66 | offset += chunks[i].length; | |
67 | } | |
68 | ||
69 | outData = newData; | |
70 | } | |
71 | ||
72 | this.strm.input = null; | |
73 | this.strm.avail_in = 0; | |
74 | this.strm.next_in = 0; | |
75 | ||
76 | return outData; | |
77 | } | |
78 | ||
79 | } |