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my-dev-server2/vscode-server-linux-x64-web/node_modules/@xterm/addon-image/out/IIPHeaderParser.js
mol 263cb5ef03
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test
2024-07-06 22:23:31 +08:00

155 lines
4.6 KiB
JavaScript

"use strict";
/**
* Copyright (c) 2023 The xterm.js authors. All rights reserved.
* @license MIT
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.HeaderParser = void 0;
// field value decoders
// ASCII bytes to string
function toStr(data) {
let s = '';
for (let i = 0; i < data.length; ++i) {
s += String.fromCharCode(data[i]);
}
return s;
}
// digits to integer
function toInt(data) {
let v = 0;
for (let i = 0; i < data.length; ++i) {
if (data[i] < 48 || data[i] > 57) {
throw new Error('illegal char');
}
v = v * 10 + data[i] - 48;
}
return v;
}
// check for correct size entry
function toSize(data) {
const v = toStr(data);
if (!v.match(/^((auto)|(\d+?((px)|(%)){0,1}))$/)) {
throw new Error('illegal size');
}
return v;
}
// name is base64 encoded utf-8
function toName(data) {
if (typeof Buffer !== 'undefined') {
return Buffer.from(toStr(data), 'base64').toString();
}
const bs = atob(toStr(data));
const b = new Uint8Array(bs.length);
for (let i = 0; i < b.length; ++i) {
b[i] = bs.charCodeAt(i);
}
return new TextDecoder().decode(b);
}
const DECODERS = {
inline: toInt,
size: toInt,
name: toName,
width: toSize,
height: toSize,
preserveAspectRatio: toInt
};
const FILE_MARKER = [70, 105, 108, 101];
const MAX_FIELDCHARS = 1024;
class HeaderParser {
constructor() {
this.state = 0 /* HeaderState.START */;
this._buffer = new Uint32Array(MAX_FIELDCHARS);
this._position = 0;
this._key = '';
this.fields = {};
}
reset() {
this._buffer.fill(0);
this.state = 0 /* HeaderState.START */;
this._position = 0;
this.fields = {};
this._key = '';
}
parse(data, start, end) {
let state = this.state;
let pos = this._position;
const buffer = this._buffer;
if (state === 1 /* HeaderState.ABORT */ || state === 4 /* HeaderState.END */)
return -1;
if (state === 0 /* HeaderState.START */ && pos > 6)
return -1;
for (let i = start; i < end; ++i) {
const c = data[i];
switch (c) {
case 59: // ;
if (!this._storeValue(pos))
return this._a();
state = 2 /* HeaderState.KEY */;
pos = 0;
break;
case 61: // =
if (state === 0 /* HeaderState.START */) {
for (let k = 0; k < FILE_MARKER.length; ++k) {
if (buffer[k] !== FILE_MARKER[k])
return this._a();
}
state = 2 /* HeaderState.KEY */;
pos = 0;
}
else if (state === 2 /* HeaderState.KEY */) {
if (!this._storeKey(pos))
return this._a();
state = 3 /* HeaderState.VALUE */;
pos = 0;
}
else if (state === 3 /* HeaderState.VALUE */) {
if (pos >= MAX_FIELDCHARS)
return this._a();
buffer[pos++] = c;
}
break;
case 58: // :
if (state === 3 /* HeaderState.VALUE */) {
if (!this._storeValue(pos))
return this._a();
}
this.state = 4 /* HeaderState.END */;
return i + 1;
default:
if (pos >= MAX_FIELDCHARS)
return this._a();
buffer[pos++] = c;
}
}
this.state = state;
this._position = pos;
return -2;
}
_a() {
this.state = 1 /* HeaderState.ABORT */;
return -1;
}
_storeKey(pos) {
const k = toStr(this._buffer.subarray(0, pos));
if (k) {
this._key = k;
this.fields[k] = null;
return true;
}
return false;
}
_storeValue(pos) {
if (this._key) {
try {
const v = this._buffer.slice(0, pos);
this.fields[this._key] = DECODERS[this._key] ? DECODERS[this._key](v) : v;
}
catch (e) {
return false;
}
return true;
}
return false;
}
}
exports.HeaderParser = HeaderParser;