320 lines
9.4 KiB
JavaScript
320 lines
9.4 KiB
JavaScript
/*
|
|
* noVNC: HTML5 VNC client
|
|
* Copyright (C) 2012 Joel Martin
|
|
* (c) 2012 Michael Tinglof, Joe Balaz, Les Piech (Mercuri.ca)
|
|
* Copyright (C) 2018 Samuel Mannehed for Cendio AB
|
|
* Copyright (C) 2018 Pierre Ossman for Cendio AB
|
|
* Licensed under MPL 2.0 (see LICENSE.txt)
|
|
*
|
|
* See README.md for usage and integration instructions.
|
|
*
|
|
*/
|
|
|
|
import * as Log from '../util/logging.js';
|
|
import Inflator from "../inflator.js";
|
|
|
|
export default class TightDecoder {
|
|
constructor() {
|
|
this._ctl = null;
|
|
this._filter = null;
|
|
this._numColors = 0;
|
|
this._palette = new Uint8Array(1024); // 256 * 4 (max palette size * max bytes-per-pixel)
|
|
this._len = 0;
|
|
|
|
this._zlibs = [];
|
|
for (let i = 0; i < 4; i++) {
|
|
this._zlibs[i] = new Inflator();
|
|
}
|
|
}
|
|
|
|
decodeRect(x, y, width, height, sock, display, depth) {
|
|
if (this._ctl === null) {
|
|
if (sock.rQwait("TIGHT compression-control", 1)) {
|
|
return false;
|
|
}
|
|
|
|
this._ctl = sock.rQshift8();
|
|
|
|
// Reset streams if the server requests it
|
|
for (let i = 0; i < 4; i++) {
|
|
if ((this._ctl >> i) & 1) {
|
|
this._zlibs[i].reset();
|
|
Log.Info("Reset zlib stream " + i);
|
|
}
|
|
}
|
|
|
|
// Figure out filter
|
|
this._ctl = this._ctl >> 4;
|
|
}
|
|
|
|
let ret;
|
|
|
|
if (this._ctl === 0x08) {
|
|
ret = this._fillRect(x, y, width, height,
|
|
sock, display, depth);
|
|
} else if (this._ctl === 0x09) {
|
|
ret = this._jpegRect(x, y, width, height,
|
|
sock, display, depth);
|
|
} else if (this._ctl === 0x0A) {
|
|
ret = this._pngRect(x, y, width, height,
|
|
sock, display, depth);
|
|
} else if ((this._ctl & 0x80) == 0) {
|
|
ret = this._basicRect(this._ctl, x, y, width, height,
|
|
sock, display, depth);
|
|
} else {
|
|
throw new Error("Illegal tight compression received (ctl: " +
|
|
this._ctl + ")");
|
|
}
|
|
|
|
if (ret) {
|
|
this._ctl = null;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
_fillRect(x, y, width, height, sock, display, depth) {
|
|
if (sock.rQwait("TIGHT", 3)) {
|
|
return false;
|
|
}
|
|
|
|
const rQi = sock.rQi;
|
|
const rQ = sock.rQ;
|
|
|
|
display.fillRect(x, y, width, height,
|
|
[rQ[rQi + 2], rQ[rQi + 1], rQ[rQi]], false);
|
|
sock.rQskipBytes(3);
|
|
|
|
return true;
|
|
}
|
|
|
|
_jpegRect(x, y, width, height, sock, display, depth) {
|
|
let data = this._readData(sock);
|
|
if (data === null) {
|
|
return false;
|
|
}
|
|
|
|
display.imageRect(x, y, "image/jpeg", data);
|
|
|
|
return true;
|
|
}
|
|
|
|
_pngRect(x, y, width, height, sock, display, depth) {
|
|
throw new Error("PNG received in standard Tight rect");
|
|
}
|
|
|
|
_basicRect(ctl, x, y, width, height, sock, display, depth) {
|
|
if (this._filter === null) {
|
|
if (ctl & 0x4) {
|
|
if (sock.rQwait("TIGHT", 1)) {
|
|
return false;
|
|
}
|
|
|
|
this._filter = sock.rQshift8();
|
|
} else {
|
|
// Implicit CopyFilter
|
|
this._filter = 0;
|
|
}
|
|
}
|
|
|
|
let streamId = ctl & 0x3;
|
|
|
|
let ret;
|
|
|
|
switch (this._filter) {
|
|
case 0: // CopyFilter
|
|
ret = this._copyFilter(streamId, x, y, width, height,
|
|
sock, display, depth);
|
|
break;
|
|
case 1: // PaletteFilter
|
|
ret = this._paletteFilter(streamId, x, y, width, height,
|
|
sock, display, depth);
|
|
break;
|
|
case 2: // GradientFilter
|
|
ret = this._gradientFilter(streamId, x, y, width, height,
|
|
sock, display, depth);
|
|
break;
|
|
default:
|
|
throw new Error("Illegal tight filter received (ctl: " +
|
|
this._filter + ")");
|
|
}
|
|
|
|
if (ret) {
|
|
this._filter = null;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
_copyFilter(streamId, x, y, width, height, sock, display, depth) {
|
|
const uncompressedSize = width * height * 3;
|
|
let data;
|
|
|
|
if (uncompressedSize < 12) {
|
|
if (sock.rQwait("TIGHT", uncompressedSize)) {
|
|
return false;
|
|
}
|
|
|
|
data = sock.rQshiftBytes(uncompressedSize);
|
|
} else {
|
|
data = this._readData(sock);
|
|
if (data === null) {
|
|
return false;
|
|
}
|
|
|
|
data = this._zlibs[streamId].inflate(data, true, uncompressedSize);
|
|
if (data.length != uncompressedSize) {
|
|
throw new Error("Incomplete zlib block");
|
|
}
|
|
}
|
|
|
|
display.blitRgbImage(x, y, width, height, data, 0, false);
|
|
|
|
return true;
|
|
}
|
|
|
|
_paletteFilter(streamId, x, y, width, height, sock, display, depth) {
|
|
if (this._numColors === 0) {
|
|
if (sock.rQwait("TIGHT palette", 1)) {
|
|
return false;
|
|
}
|
|
|
|
const numColors = sock.rQpeek8() + 1;
|
|
const paletteSize = numColors * 3;
|
|
|
|
if (sock.rQwait("TIGHT palette", 1 + paletteSize)) {
|
|
return false;
|
|
}
|
|
|
|
this._numColors = numColors;
|
|
sock.rQskipBytes(1);
|
|
|
|
sock.rQshiftTo(this._palette, paletteSize);
|
|
}
|
|
|
|
const bpp = (this._numColors <= 2) ? 1 : 8;
|
|
const rowSize = Math.floor((width * bpp + 7) / 8);
|
|
const uncompressedSize = rowSize * height;
|
|
|
|
let data;
|
|
|
|
if (uncompressedSize < 12) {
|
|
if (sock.rQwait("TIGHT", uncompressedSize)) {
|
|
return false;
|
|
}
|
|
|
|
data = sock.rQshiftBytes(uncompressedSize);
|
|
} else {
|
|
data = this._readData(sock);
|
|
if (data === null) {
|
|
return false;
|
|
}
|
|
|
|
data = this._zlibs[streamId].inflate(data, true, uncompressedSize);
|
|
if (data.length != uncompressedSize) {
|
|
throw new Error("Incomplete zlib block");
|
|
}
|
|
}
|
|
|
|
// Convert indexed (palette based) image data to RGB
|
|
if (this._numColors == 2) {
|
|
this._monoRect(x, y, width, height, data, this._palette, display);
|
|
} else {
|
|
this._paletteRect(x, y, width, height, data, this._palette, display);
|
|
}
|
|
|
|
this._numColors = 0;
|
|
|
|
return true;
|
|
}
|
|
|
|
_monoRect(x, y, width, height, data, palette, display) {
|
|
// Convert indexed (palette based) image data to RGB
|
|
// TODO: reduce number of calculations inside loop
|
|
const dest = this._getScratchBuffer(width * height * 4);
|
|
const w = Math.floor((width + 7) / 8);
|
|
const w1 = Math.floor(width / 8);
|
|
|
|
for (let y = 0; y < height; y++) {
|
|
let dp, sp, x;
|
|
for (x = 0; x < w1; x++) {
|
|
for (let b = 7; b >= 0; b--) {
|
|
dp = (y * width + x * 8 + 7 - b) * 4;
|
|
sp = (data[y * w + x] >> b & 1) * 3;
|
|
dest[dp] = palette[sp];
|
|
dest[dp + 1] = palette[sp + 1];
|
|
dest[dp + 2] = palette[sp + 2];
|
|
dest[dp + 3] = 255;
|
|
}
|
|
}
|
|
|
|
for (let b = 7; b >= 8 - width % 8; b--) {
|
|
dp = (y * width + x * 8 + 7 - b) * 4;
|
|
sp = (data[y * w + x] >> b & 1) * 3;
|
|
dest[dp] = palette[sp];
|
|
dest[dp + 1] = palette[sp + 1];
|
|
dest[dp + 2] = palette[sp + 2];
|
|
dest[dp + 3] = 255;
|
|
}
|
|
}
|
|
|
|
display.blitRgbxImage(x, y, width, height, dest, 0, false);
|
|
}
|
|
|
|
_paletteRect(x, y, width, height, data, palette, display) {
|
|
// Convert indexed (palette based) image data to RGB
|
|
const dest = this._getScratchBuffer(width * height * 4);
|
|
const total = width * height * 4;
|
|
for (let i = 0, j = 0; i < total; i += 4, j++) {
|
|
const sp = data[j] * 3;
|
|
dest[i] = palette[sp];
|
|
dest[i + 1] = palette[sp + 1];
|
|
dest[i + 2] = palette[sp + 2];
|
|
dest[i + 3] = 255;
|
|
}
|
|
|
|
display.blitRgbxImage(x, y, width, height, dest, 0, false);
|
|
}
|
|
|
|
_gradientFilter(streamId, x, y, width, height, sock, display, depth) {
|
|
throw new Error("Gradient filter not implemented");
|
|
}
|
|
|
|
_readData(sock) {
|
|
if (this._len === 0) {
|
|
if (sock.rQwait("TIGHT", 3)) {
|
|
return null;
|
|
}
|
|
|
|
let byte;
|
|
|
|
byte = sock.rQshift8();
|
|
this._len = byte & 0x7f;
|
|
if (byte & 0x80) {
|
|
byte = sock.rQshift8();
|
|
this._len |= (byte & 0x7f) << 7;
|
|
if (byte & 0x80) {
|
|
byte = sock.rQshift8();
|
|
this._len |= byte << 14;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (sock.rQwait("TIGHT", this._len)) {
|
|
return null;
|
|
}
|
|
|
|
let data = sock.rQshiftBytes(this._len);
|
|
this._len = 0;
|
|
|
|
return data;
|
|
}
|
|
|
|
_getScratchBuffer(size) {
|
|
if (!this._scratchBuffer || (this._scratchBuffer.length < size)) {
|
|
this._scratchBuffer = new Uint8Array(size);
|
|
}
|
|
return this._scratchBuffer;
|
|
}
|
|
}
|