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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>JSDoc: Source: shared/util.js</title>
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<h1 class="page-title">Source: shared/util.js</h1>
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<pre class="prettyprint source linenums"><code>/* Copyright 2012 Mozilla Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* globals global, process, __pdfjsdev_webpack__ */
import './compatibility';
import { ReadableStream } from '../../external/streams/streams-lib';
var globalScope = (typeof window !== 'undefined') ? window :
(typeof global !== 'undefined') ? global :
(typeof self !== 'undefined') ? self : this;
var FONT_IDENTITY_MATRIX = [0.001, 0, 0, 0.001, 0, 0];
const NativeImageDecoding = {
NONE: 'none',
DECODE: 'decode',
DISPLAY: 'display',
};
var TextRenderingMode = {
FILL: 0,
STROKE: 1,
FILL_STROKE: 2,
INVISIBLE: 3,
FILL_ADD_TO_PATH: 4,
STROKE_ADD_TO_PATH: 5,
FILL_STROKE_ADD_TO_PATH: 6,
ADD_TO_PATH: 7,
FILL_STROKE_MASK: 3,
ADD_TO_PATH_FLAG: 4,
};
var ImageKind = {
GRAYSCALE_1BPP: 1,
RGB_24BPP: 2,
RGBA_32BPP: 3,
};
var AnnotationType = {
TEXT: 1,
LINK: 2,
FREETEXT: 3,
LINE: 4,
SQUARE: 5,
CIRCLE: 6,
POLYGON: 7,
POLYLINE: 8,
HIGHLIGHT: 9,
UNDERLINE: 10,
SQUIGGLY: 11,
STRIKEOUT: 12,
STAMP: 13,
CARET: 14,
INK: 15,
POPUP: 16,
FILEATTACHMENT: 17,
SOUND: 18,
MOVIE: 19,
WIDGET: 20,
SCREEN: 21,
PRINTERMARK: 22,
TRAPNET: 23,
WATERMARK: 24,
THREED: 25,
REDACT: 26,
};
var AnnotationFlag = {
INVISIBLE: 0x01,
HIDDEN: 0x02,
PRINT: 0x04,
NOZOOM: 0x08,
NOROTATE: 0x10,
NOVIEW: 0x20,
READONLY: 0x40,
LOCKED: 0x80,
TOGGLENOVIEW: 0x100,
LOCKEDCONTENTS: 0x200,
};
var AnnotationFieldFlag = {
READONLY: 0x0000001,
REQUIRED: 0x0000002,
NOEXPORT: 0x0000004,
MULTILINE: 0x0001000,
PASSWORD: 0x0002000,
NOTOGGLETOOFF: 0x0004000,
RADIO: 0x0008000,
PUSHBUTTON: 0x0010000,
COMBO: 0x0020000,
EDIT: 0x0040000,
SORT: 0x0080000,
FILESELECT: 0x0100000,
MULTISELECT: 0x0200000,
DONOTSPELLCHECK: 0x0400000,
DONOTSCROLL: 0x0800000,
COMB: 0x1000000,
RICHTEXT: 0x2000000,
RADIOSINUNISON: 0x2000000,
COMMITONSELCHANGE: 0x4000000,
};
var AnnotationBorderStyleType = {
SOLID: 1,
DASHED: 2,
BEVELED: 3,
INSET: 4,
UNDERLINE: 5,
};
var StreamType = {
UNKNOWN: 0,
FLATE: 1,
LZW: 2,
DCT: 3,
JPX: 4,
JBIG: 5,
A85: 6,
AHX: 7,
CCF: 8,
RL: 9,
};
var FontType = {
UNKNOWN: 0,
TYPE1: 1,
TYPE1C: 2,
CIDFONTTYPE0: 3,
CIDFONTTYPE0C: 4,
TRUETYPE: 5,
CIDFONTTYPE2: 6,
TYPE3: 7,
OPENTYPE: 8,
TYPE0: 9,
MMTYPE1: 10,
};
var VERBOSITY_LEVELS = {
errors: 0,
warnings: 1,
infos: 5,
};
var CMapCompressionType = {
NONE: 0,
BINARY: 1,
STREAM: 2,
};
// All the possible operations for an operator list.
var OPS = {
// Intentionally start from 1 so it is easy to spot bad operators that will be
// 0's.
dependency: 1,
setLineWidth: 2,
setLineCap: 3,
setLineJoin: 4,
setMiterLimit: 5,
setDash: 6,
setRenderingIntent: 7,
setFlatness: 8,
setGState: 9,
save: 10,
restore: 11,
transform: 12,
moveTo: 13,
lineTo: 14,
curveTo: 15,
curveTo2: 16,
curveTo3: 17,
closePath: 18,
rectangle: 19,
stroke: 20,
closeStroke: 21,
fill: 22,
eoFill: 23,
fillStroke: 24,
eoFillStroke: 25,
closeFillStroke: 26,
closeEOFillStroke: 27,
endPath: 28,
clip: 29,
eoClip: 30,
beginText: 31,
endText: 32,
setCharSpacing: 33,
setWordSpacing: 34,
setHScale: 35,
setLeading: 36,
setFont: 37,
setTextRenderingMode: 38,
setTextRise: 39,
moveText: 40,
setLeadingMoveText: 41,
setTextMatrix: 42,
nextLine: 43,
showText: 44,
showSpacedText: 45,
nextLineShowText: 46,
nextLineSetSpacingShowText: 47,
setCharWidth: 48,
setCharWidthAndBounds: 49,
setStrokeColorSpace: 50,
setFillColorSpace: 51,
setStrokeColor: 52,
setStrokeColorN: 53,
setFillColor: 54,
setFillColorN: 55,
setStrokeGray: 56,
setFillGray: 57,
setStrokeRGBColor: 58,
setFillRGBColor: 59,
setStrokeCMYKColor: 60,
setFillCMYKColor: 61,
shadingFill: 62,
beginInlineImage: 63,
beginImageData: 64,
endInlineImage: 65,
paintXObject: 66,
markPoint: 67,
markPointProps: 68,
beginMarkedContent: 69,
beginMarkedContentProps: 70,
endMarkedContent: 71,
beginCompat: 72,
endCompat: 73,
paintFormXObjectBegin: 74,
paintFormXObjectEnd: 75,
beginGroup: 76,
endGroup: 77,
beginAnnotations: 78,
endAnnotations: 79,
beginAnnotation: 80,
endAnnotation: 81,
paintJpegXObject: 82,
paintImageMaskXObject: 83,
paintImageMaskXObjectGroup: 84,
paintImageXObject: 85,
paintInlineImageXObject: 86,
paintInlineImageXObjectGroup: 87,
paintImageXObjectRepeat: 88,
paintImageMaskXObjectRepeat: 89,
paintSolidColorImageMask: 90,
constructPath: 91,
};
var verbosity = VERBOSITY_LEVELS.warnings;
function setVerbosityLevel(level) {
verbosity = level;
}
function getVerbosityLevel() {
return verbosity;
}
// A notice for devs. These are good for things that are helpful to devs, such
// as warning that Workers were disabled, which is important to devs but not
// end users.
function info(msg) {
if (verbosity >= VERBOSITY_LEVELS.infos) {
console.log('Info: ' + msg);
}
}
// Non-fatal warnings.
function warn(msg) {
if (verbosity >= VERBOSITY_LEVELS.warnings) {
console.log('Warning: ' + msg);
}
}
// Deprecated API function -- display regardless of the PDFJS.verbosity setting.
function deprecated(details) {
console.log('Deprecated API usage: ' + details);
}
// Fatal errors that should trigger the fallback UI and halt execution by
// throwing an exception.
function error(msg) {
if (verbosity >= VERBOSITY_LEVELS.errors) {
console.log('Error: ' + msg);
console.log(backtrace());
}
throw new Error(msg);
}
function backtrace() {
try {
throw new Error();
} catch (e) {
return e.stack ? e.stack.split('\n').slice(2).join('\n') : '';
}
}
function assert(cond, msg) {
if (!cond) {
error(msg);
}
}
var UNSUPPORTED_FEATURES = {
unknown: 'unknown',
forms: 'forms',
javaScript: 'javaScript',
smask: 'smask',
shadingPattern: 'shadingPattern',
font: 'font',
};
// Checks if URLs have the same origin. For non-HTTP based URLs, returns false.
function isSameOrigin(baseUrl, otherUrl) {
try {
var base = new URL(baseUrl);
if (!base.origin || base.origin === 'null') {
return false; // non-HTTP url
}
} catch (e) {
return false;
}
var other = new URL(otherUrl, base);
return base.origin === other.origin;
}
// Checks if URLs use one of the whitelisted protocols, e.g. to avoid XSS.
function isValidProtocol(url) {
if (!url) {
return false;
}
switch (url.protocol) {
case 'http:':
case 'https:':
case 'ftp:':
case 'mailto:':
case 'tel:':
return true;
default:
return false;
}
}
/**
* Attempts to create a valid absolute URL (utilizing `isValidProtocol`).
* @param {URL|string} url - An absolute, or relative, URL.
* @param {URL|string} baseUrl - An absolute URL.
* @returns Either a valid {URL}, or `null` otherwise.
*/
function createValidAbsoluteUrl(url, baseUrl) {
if (!url) {
return null;
}
try {
var absoluteUrl = baseUrl ? new URL(url, baseUrl) : new URL(url);
if (isValidProtocol(absoluteUrl)) {
return absoluteUrl;
}
} catch (ex) { /* `new URL()` will throw on incorrect data. */ }
return null;
}
function shadow(obj, prop, value) {
Object.defineProperty(obj, prop, { value,
enumerable: true,
configurable: true,
writable: false, });
return value;
}
function getLookupTableFactory(initializer) {
var lookup;
return function () {
if (initializer) {
lookup = Object.create(null);
initializer(lookup);
initializer = null;
}
return lookup;
};
}
var PasswordResponses = {
NEED_PASSWORD: 1,
INCORRECT_PASSWORD: 2,
};
var PasswordException = (function PasswordExceptionClosure() {
function PasswordException(msg, code) {
this.name = 'PasswordException';
this.message = msg;
this.code = code;
}
PasswordException.prototype = new Error();
PasswordException.constructor = PasswordException;
return PasswordException;
})();
var UnknownErrorException = (function UnknownErrorExceptionClosure() {
function UnknownErrorException(msg, details) {
this.name = 'UnknownErrorException';
this.message = msg;
this.details = details;
}
UnknownErrorException.prototype = new Error();
UnknownErrorException.constructor = UnknownErrorException;
return UnknownErrorException;
})();
var InvalidPDFException = (function InvalidPDFExceptionClosure() {
function InvalidPDFException(msg) {
this.name = 'InvalidPDFException';
this.message = msg;
}
InvalidPDFException.prototype = new Error();
InvalidPDFException.constructor = InvalidPDFException;
return InvalidPDFException;
})();
var MissingPDFException = (function MissingPDFExceptionClosure() {
function MissingPDFException(msg) {
this.name = 'MissingPDFException';
this.message = msg;
}
MissingPDFException.prototype = new Error();
MissingPDFException.constructor = MissingPDFException;
return MissingPDFException;
})();
var UnexpectedResponseException =
(function UnexpectedResponseExceptionClosure() {
function UnexpectedResponseException(msg, status) {
this.name = 'UnexpectedResponseException';
this.message = msg;
this.status = status;
}
UnexpectedResponseException.prototype = new Error();
UnexpectedResponseException.constructor = UnexpectedResponseException;
return UnexpectedResponseException;
})();
var NotImplementedException = (function NotImplementedExceptionClosure() {
function NotImplementedException(msg) {
this.message = msg;
}
NotImplementedException.prototype = new Error();
NotImplementedException.prototype.name = 'NotImplementedException';
NotImplementedException.constructor = NotImplementedException;
return NotImplementedException;
})();
var MissingDataException = (function MissingDataExceptionClosure() {
function MissingDataException(begin, end) {
this.begin = begin;
this.end = end;
this.message = 'Missing data [' + begin + ', ' + end + ')';
}
MissingDataException.prototype = new Error();
MissingDataException.prototype.name = 'MissingDataException';
MissingDataException.constructor = MissingDataException;
return MissingDataException;
})();
var XRefParseException = (function XRefParseExceptionClosure() {
function XRefParseException(msg) {
this.message = msg;
}
XRefParseException.prototype = new Error();
XRefParseException.prototype.name = 'XRefParseException';
XRefParseException.constructor = XRefParseException;
return XRefParseException;
})();
var NullCharactersRegExp = /\x00/g;
function removeNullCharacters(str) {
if (typeof str !== 'string') {
warn('The argument for removeNullCharacters must be a string.');
return str;
}
return str.replace(NullCharactersRegExp, '');
}
function bytesToString(bytes) {
assert(bytes !== null &amp;&amp; typeof bytes === 'object' &amp;&amp;
bytes.length !== undefined, 'Invalid argument for bytesToString');
var length = bytes.length;
var MAX_ARGUMENT_COUNT = 8192;
if (length &lt; MAX_ARGUMENT_COUNT) {
return String.fromCharCode.apply(null, bytes);
}
var strBuf = [];
for (var i = 0; i &lt; length; i += MAX_ARGUMENT_COUNT) {
var chunkEnd = Math.min(i + MAX_ARGUMENT_COUNT, length);
var chunk = bytes.subarray(i, chunkEnd);
strBuf.push(String.fromCharCode.apply(null, chunk));
}
return strBuf.join('');
}
function stringToBytes(str) {
assert(typeof str === 'string', 'Invalid argument for stringToBytes');
var length = str.length;
var bytes = new Uint8Array(length);
for (var i = 0; i &lt; length; ++i) {
bytes[i] = str.charCodeAt(i) &amp; 0xFF;
}
return bytes;
}
/**
* Gets length of the array (Array, Uint8Array, or string) in bytes.
* @param {Array|Uint8Array|string} arr
* @returns {number}
*/
function arrayByteLength(arr) {
if (arr.length !== undefined) {
return arr.length;
}
assert(arr.byteLength !== undefined);
return arr.byteLength;
}
/**
* Combines array items (arrays) into single Uint8Array object.
* @param {Array} arr - the array of the arrays (Array, Uint8Array, or string).
* @returns {Uint8Array}
*/
function arraysToBytes(arr) {
// Shortcut: if first and only item is Uint8Array, return it.
if (arr.length === 1 &amp;&amp; (arr[0] instanceof Uint8Array)) {
return arr[0];
}
var resultLength = 0;
var i, ii = arr.length;
var item, itemLength;
for (i = 0; i &lt; ii; i++) {
item = arr[i];
itemLength = arrayByteLength(item);
resultLength += itemLength;
}
var pos = 0;
var data = new Uint8Array(resultLength);
for (i = 0; i &lt; ii; i++) {
item = arr[i];
if (!(item instanceof Uint8Array)) {
if (typeof item === 'string') {
item = stringToBytes(item);
} else {
item = new Uint8Array(item);
}
}
itemLength = item.byteLength;
data.set(item, pos);
pos += itemLength;
}
return data;
}
function string32(value) {
return String.fromCharCode((value >> 24) &amp; 0xff, (value >> 16) &amp; 0xff,
(value >> 8) &amp; 0xff, value &amp; 0xff);
}
function log2(x) {
var n = 1, i = 0;
while (x > n) {
n &lt;&lt;= 1;
i++;
}
return i;
}
function readInt8(data, start) {
return (data[start] &lt;&lt; 24) >> 24;
}
function readUint16(data, offset) {
return (data[offset] &lt;&lt; 8) | data[offset + 1];
}
function readUint32(data, offset) {
return ((data[offset] &lt;&lt; 24) | (data[offset + 1] &lt;&lt; 16) |
(data[offset + 2] &lt;&lt; 8) | data[offset + 3]) >>> 0;
}
// Lazy test the endianness of the platform
// NOTE: This will be 'true' for simulated TypedArrays
function isLittleEndian() {
var buffer8 = new Uint8Array(4);
buffer8[0] = 1;
var view32 = new Uint32Array(buffer8.buffer, 0, 1);
return (view32[0] === 1);
}
// Checks if it's possible to eval JS expressions.
function isEvalSupported() {
try {
new Function(''); // eslint-disable-line no-new, no-new-func
return true;
} catch (e) {
return false;
}
}
var IDENTITY_MATRIX = [1, 0, 0, 1, 0, 0];
var Util = (function UtilClosure() {
function Util() {}
var rgbBuf = ['rgb(', 0, ',', 0, ',', 0, ')'];
// makeCssRgb() can be called thousands of times. Using |rgbBuf| avoids
// creating many intermediate strings.
Util.makeCssRgb = function Util_makeCssRgb(r, g, b) {
rgbBuf[1] = r;
rgbBuf[3] = g;
rgbBuf[5] = b;
return rgbBuf.join('');
};
// Concatenates two transformation matrices together and returns the result.
Util.transform = function Util_transform(m1, m2) {
return [
m1[0] * m2[0] + m1[2] * m2[1],
m1[1] * m2[0] + m1[3] * m2[1],
m1[0] * m2[2] + m1[2] * m2[3],
m1[1] * m2[2] + m1[3] * m2[3],
m1[0] * m2[4] + m1[2] * m2[5] + m1[4],
m1[1] * m2[4] + m1[3] * m2[5] + m1[5]
];
};
// For 2d affine transforms
Util.applyTransform = function Util_applyTransform(p, m) {
var xt = p[0] * m[0] + p[1] * m[2] + m[4];
var yt = p[0] * m[1] + p[1] * m[3] + m[5];
return [xt, yt];
};
Util.applyInverseTransform = function Util_applyInverseTransform(p, m) {
var d = m[0] * m[3] - m[1] * m[2];
var xt = (p[0] * m[3] - p[1] * m[2] + m[2] * m[5] - m[4] * m[3]) / d;
var yt = (-p[0] * m[1] + p[1] * m[0] + m[4] * m[1] - m[5] * m[0]) / d;
return [xt, yt];
};
// Applies the transform to the rectangle and finds the minimum axially
// aligned bounding box.
Util.getAxialAlignedBoundingBox =
function Util_getAxialAlignedBoundingBox(r, m) {
var p1 = Util.applyTransform(r, m);
var p2 = Util.applyTransform(r.slice(2, 4), m);
var p3 = Util.applyTransform([r[0], r[3]], m);
var p4 = Util.applyTransform([r[2], r[1]], m);
return [
Math.min(p1[0], p2[0], p3[0], p4[0]),
Math.min(p1[1], p2[1], p3[1], p4[1]),
Math.max(p1[0], p2[0], p3[0], p4[0]),
Math.max(p1[1], p2[1], p3[1], p4[1])
];
};
Util.inverseTransform = function Util_inverseTransform(m) {
var d = m[0] * m[3] - m[1] * m[2];
return [m[3] / d, -m[1] / d, -m[2] / d, m[0] / d,
(m[2] * m[5] - m[4] * m[3]) / d, (m[4] * m[1] - m[5] * m[0]) / d];
};
// Apply a generic 3d matrix M on a 3-vector v:
// | a b c | | X |
// | d e f | x | Y |
// | g h i | | Z |
// M is assumed to be serialized as [a,b,c,d,e,f,g,h,i],
// with v as [X,Y,Z]
Util.apply3dTransform = function Util_apply3dTransform(m, v) {
return [
m[0] * v[0] + m[1] * v[1] + m[2] * v[2],
m[3] * v[0] + m[4] * v[1] + m[5] * v[2],
m[6] * v[0] + m[7] * v[1] + m[8] * v[2]
];
};
// This calculation uses Singular Value Decomposition.
// The SVD can be represented with formula A = USV. We are interested in the
// matrix S here because it represents the scale values.
Util.singularValueDecompose2dScale =
function Util_singularValueDecompose2dScale(m) {
var transpose = [m[0], m[2], m[1], m[3]];
// Multiply matrix m with its transpose.
var a = m[0] * transpose[0] + m[1] * transpose[2];
var b = m[0] * transpose[1] + m[1] * transpose[3];
var c = m[2] * transpose[0] + m[3] * transpose[2];
var d = m[2] * transpose[1] + m[3] * transpose[3];
// Solve the second degree polynomial to get roots.
var first = (a + d) / 2;
var second = Math.sqrt((a + d) * (a + d) - 4 * (a * d - c * b)) / 2;
var sx = first + second || 1;
var sy = first - second || 1;
// Scale values are the square roots of the eigenvalues.
return [Math.sqrt(sx), Math.sqrt(sy)];
};
// Normalize rectangle rect=[x1, y1, x2, y2] so that (x1,y1) &lt; (x2,y2)
// For coordinate systems whose origin lies in the bottom-left, this
// means normalization to (BL,TR) ordering. For systems with origin in the
// top-left, this means (TL,BR) ordering.
Util.normalizeRect = function Util_normalizeRect(rect) {
var r = rect.slice(0); // clone rect
if (rect[0] > rect[2]) {
r[0] = rect[2];
r[2] = rect[0];
}
if (rect[1] > rect[3]) {
r[1] = rect[3];
r[3] = rect[1];
}
return r;
};
// Returns a rectangle [x1, y1, x2, y2] corresponding to the
// intersection of rect1 and rect2. If no intersection, returns 'false'
// The rectangle coordinates of rect1, rect2 should be [x1, y1, x2, y2]
Util.intersect = function Util_intersect(rect1, rect2) {
function compare(a, b) {
return a - b;
}
// Order points along the axes
var orderedX = [rect1[0], rect1[2], rect2[0], rect2[2]].sort(compare),
orderedY = [rect1[1], rect1[3], rect2[1], rect2[3]].sort(compare),
result = [];
rect1 = Util.normalizeRect(rect1);
rect2 = Util.normalizeRect(rect2);
// X: first and second points belong to different rectangles?
if ((orderedX[0] === rect1[0] &amp;&amp; orderedX[1] === rect2[0]) ||
(orderedX[0] === rect2[0] &amp;&amp; orderedX[1] === rect1[0])) {
// Intersection must be between second and third points
result[0] = orderedX[1];
result[2] = orderedX[2];
} else {
return false;
}
// Y: first and second points belong to different rectangles?
if ((orderedY[0] === rect1[1] &amp;&amp; orderedY[1] === rect2[1]) ||
(orderedY[0] === rect2[1] &amp;&amp; orderedY[1] === rect1[1])) {
// Intersection must be between second and third points
result[1] = orderedY[1];
result[3] = orderedY[2];
} else {
return false;
}
return result;
};
Util.sign = function Util_sign(num) {
return num &lt; 0 ? -1 : 1;
};
var ROMAN_NUMBER_MAP = [
'', 'C', 'CC', 'CCC', 'CD', 'D', 'DC', 'DCC', 'DCCC', 'CM',
'', 'X', 'XX', 'XXX', 'XL', 'L', 'LX', 'LXX', 'LXXX', 'XC',
'', 'I', 'II', 'III', 'IV', 'V', 'VI', 'VII', 'VIII', 'IX'
];
/**
* Converts positive integers to (upper case) Roman numerals.
* @param {integer} number - The number that should be converted.
* @param {boolean} lowerCase - Indicates if the result should be converted
* to lower case letters. The default is false.
* @return {string} The resulting Roman number.
*/
Util.toRoman = function Util_toRoman(number, lowerCase) {
assert(isInt(number) &amp;&amp; number > 0,
'The number should be a positive integer.');
var pos, romanBuf = [];
// Thousands
while (number >= 1000) {
number -= 1000;
romanBuf.push('M');
}
// Hundreds
pos = (number / 100) | 0;
number %= 100;
romanBuf.push(ROMAN_NUMBER_MAP[pos]);
// Tens
pos = (number / 10) | 0;
number %= 10;
romanBuf.push(ROMAN_NUMBER_MAP[10 + pos]);
// Ones
romanBuf.push(ROMAN_NUMBER_MAP[20 + number]);
var romanStr = romanBuf.join('');
return (lowerCase ? romanStr.toLowerCase() : romanStr);
};
Util.appendToArray = function Util_appendToArray(arr1, arr2) {
Array.prototype.push.apply(arr1, arr2);
};
Util.prependToArray = function Util_prependToArray(arr1, arr2) {
Array.prototype.unshift.apply(arr1, arr2);
};
Util.extendObj = function extendObj(obj1, obj2) {
for (var key in obj2) {
obj1[key] = obj2[key];
}
};
Util.getInheritableProperty =
function Util_getInheritableProperty(dict, name, getArray) {
while (dict &amp;&amp; !dict.has(name)) {
dict = dict.get('Parent');
}
if (!dict) {
return null;
}
return getArray ? dict.getArray(name) : dict.get(name);
};
Util.inherit = function Util_inherit(sub, base, prototype) {
sub.prototype = Object.create(base.prototype);
sub.prototype.constructor = sub;
for (var prop in prototype) {
sub.prototype[prop] = prototype[prop];
}
};
Util.loadScript = function Util_loadScript(src, callback) {
var script = document.createElement('script');
var loaded = false;
script.setAttribute('src', src);
if (callback) {
script.onload = function() {
if (!loaded) {
callback();
}
loaded = true;
};
}
document.getElementsByTagName('head')[0].appendChild(script);
};
return Util;
})();
/**
* PDF page viewport created based on scale, rotation and offset.
* @class
* @alias PageViewport
*/
var PageViewport = (function PageViewportClosure() {
/**
* @constructor
* @private
* @param viewBox {Array} xMin, yMin, xMax and yMax coordinates.
* @param scale {number} scale of the viewport.
* @param rotation {number} rotations of the viewport in degrees.
* @param offsetX {number} offset X
* @param offsetY {number} offset Y
* @param dontFlip {boolean} if true, axis Y will not be flipped.
*/
function PageViewport(viewBox, scale, rotation, offsetX, offsetY, dontFlip) {
this.viewBox = viewBox;
this.scale = scale;
this.rotation = rotation;
this.offsetX = offsetX;
this.offsetY = offsetY;
// creating transform to convert pdf coordinate system to the normal
// canvas like coordinates taking in account scale and rotation
var centerX = (viewBox[2] + viewBox[0]) / 2;
var centerY = (viewBox[3] + viewBox[1]) / 2;
var rotateA, rotateB, rotateC, rotateD;
rotation = rotation % 360;
rotation = rotation &lt; 0 ? rotation + 360 : rotation;
switch (rotation) {
case 180:
rotateA = -1; rotateB = 0; rotateC = 0; rotateD = 1;
break;
case 90:
rotateA = 0; rotateB = 1; rotateC = 1; rotateD = 0;
break;
case 270:
rotateA = 0; rotateB = -1; rotateC = -1; rotateD = 0;
break;
// case 0:
default:
rotateA = 1; rotateB = 0; rotateC = 0; rotateD = -1;
break;
}
if (dontFlip) {
rotateC = -rotateC; rotateD = -rotateD;
}
var offsetCanvasX, offsetCanvasY;
var width, height;
if (rotateA === 0) {
offsetCanvasX = Math.abs(centerY - viewBox[1]) * scale + offsetX;
offsetCanvasY = Math.abs(centerX - viewBox[0]) * scale + offsetY;
width = Math.abs(viewBox[3] - viewBox[1]) * scale;
height = Math.abs(viewBox[2] - viewBox[0]) * scale;
} else {
offsetCanvasX = Math.abs(centerX - viewBox[0]) * scale + offsetX;
offsetCanvasY = Math.abs(centerY - viewBox[1]) * scale + offsetY;
width = Math.abs(viewBox[2] - viewBox[0]) * scale;
height = Math.abs(viewBox[3] - viewBox[1]) * scale;
}
// creating transform for the following operations:
// translate(-centerX, -centerY), rotate and flip vertically,
// scale, and translate(offsetCanvasX, offsetCanvasY)
this.transform = [
rotateA * scale,
rotateB * scale,
rotateC * scale,
rotateD * scale,
offsetCanvasX - rotateA * scale * centerX - rotateC * scale * centerY,
offsetCanvasY - rotateB * scale * centerX - rotateD * scale * centerY
];
this.width = width;
this.height = height;
this.fontScale = scale;
}
PageViewport.prototype = /** @lends PageViewport.prototype */ {
/**
* Clones viewport with additional properties.
* @param args {Object} (optional) If specified, may contain the 'scale' or
* 'rotation' properties to override the corresponding properties in
* the cloned viewport.
* @returns {PageViewport} Cloned viewport.
*/
clone: function PageViewPort_clone(args) {
args = args || {};
var scale = 'scale' in args ? args.scale : this.scale;
var rotation = 'rotation' in args ? args.rotation : this.rotation;
return new PageViewport(this.viewBox.slice(), scale, rotation,
this.offsetX, this.offsetY, args.dontFlip);
},
/**
* Converts PDF point to the viewport coordinates. For examples, useful for
* converting PDF location into canvas pixel coordinates.
* @param x {number} X coordinate.
* @param y {number} Y coordinate.
* @returns {Object} Object that contains 'x' and 'y' properties of the
* point in the viewport coordinate space.
* @see {@link convertToPdfPoint}
* @see {@link convertToViewportRectangle}
*/
convertToViewportPoint: function PageViewport_convertToViewportPoint(x, y) {
return Util.applyTransform([x, y], this.transform);
},
/**
* Converts PDF rectangle to the viewport coordinates.
* @param rect {Array} xMin, yMin, xMax and yMax coordinates.
* @returns {Array} Contains corresponding coordinates of the rectangle
* in the viewport coordinate space.
* @see {@link convertToViewportPoint}
*/
convertToViewportRectangle:
function PageViewport_convertToViewportRectangle(rect) {
var tl = Util.applyTransform([rect[0], rect[1]], this.transform);
var br = Util.applyTransform([rect[2], rect[3]], this.transform);
return [tl[0], tl[1], br[0], br[1]];
},
/**
* Converts viewport coordinates to the PDF location. For examples, useful
* for converting canvas pixel location into PDF one.
* @param x {number} X coordinate.
* @param y {number} Y coordinate.
* @returns {Object} Object that contains 'x' and 'y' properties of the
* point in the PDF coordinate space.
* @see {@link convertToViewportPoint}
*/
convertToPdfPoint: function PageViewport_convertToPdfPoint(x, y) {
return Util.applyInverseTransform([x, y], this.transform);
},
};
return PageViewport;
})();
var PDFStringTranslateTable = [
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0x2D8, 0x2C7, 0x2C6, 0x2D9, 0x2DD, 0x2DB, 0x2DA, 0x2DC, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x2022, 0x2020, 0x2021, 0x2026, 0x2014,
0x2013, 0x192, 0x2044, 0x2039, 0x203A, 0x2212, 0x2030, 0x201E, 0x201C,
0x201D, 0x2018, 0x2019, 0x201A, 0x2122, 0xFB01, 0xFB02, 0x141, 0x152, 0x160,
0x178, 0x17D, 0x131, 0x142, 0x153, 0x161, 0x17E, 0, 0x20AC
];
function stringToPDFString(str) {
var i, n = str.length, strBuf = [];
if (str[0] === '\xFE' &amp;&amp; str[1] === '\xFF') {
// UTF16BE BOM
for (i = 2; i &lt; n; i += 2) {
strBuf.push(String.fromCharCode(
(str.charCodeAt(i) &lt;&lt; 8) | str.charCodeAt(i + 1)));
}
} else {
for (i = 0; i &lt; n; ++i) {
var code = PDFStringTranslateTable[str.charCodeAt(i)];
strBuf.push(code ? String.fromCharCode(code) : str.charAt(i));
}
}
return strBuf.join('');
}
function stringToUTF8String(str) {
return decodeURIComponent(escape(str));
}
function utf8StringToString(str) {
return unescape(encodeURIComponent(str));
}
function isEmptyObj(obj) {
for (var key in obj) {
return false;
}
return true;
}
function isBool(v) {
return typeof v === 'boolean';
}
function isInt(v) {
return typeof v === 'number' &amp;&amp; ((v | 0) === v);
}
function isNum(v) {
return typeof v === 'number';
}
function isString(v) {
return typeof v === 'string';
}
function isArray(v) {
return v instanceof Array;
}
function isArrayBuffer(v) {
return typeof v === 'object' &amp;&amp; v !== null &amp;&amp; v.byteLength !== undefined;
}
// Checks if ch is one of the following characters: SPACE, TAB, CR or LF.
function isSpace(ch) {
return (ch === 0x20 || ch === 0x09 || ch === 0x0D || ch === 0x0A);
}
function isNodeJS() {
// The if below protected by __pdfjsdev_webpack__ check from webpack parsing.
if (typeof __pdfjsdev_webpack__ === 'undefined') {
return typeof process === 'object' &amp;&amp; process + '' === '[object process]';
}
return false;
}
/**
* Promise Capability object.
*
* @typedef {Object} PromiseCapability
* @property {Promise} promise - A promise object.
* @property {function} resolve - Fulfills the promise.
* @property {function} reject - Rejects the promise.
*/
/**
* Creates a promise capability object.
* @alias createPromiseCapability
*
* @return {PromiseCapability} A capability object contains:
* - a Promise, resolve and reject methods.
*/
function createPromiseCapability() {
var capability = {};
capability.promise = new Promise(function (resolve, reject) {
capability.resolve = resolve;
capability.reject = reject;
});
return capability;
}
var StatTimer = (function StatTimerClosure() {
function rpad(str, pad, length) {
while (str.length &lt; length) {
str += pad;
}
return str;
}
function StatTimer() {
this.started = Object.create(null);
this.times = [];
this.enabled = true;
}
StatTimer.prototype = {
time: function StatTimer_time(name) {
if (!this.enabled) {
return;
}
if (name in this.started) {
warn('Timer is already running for ' + name);
}
this.started[name] = Date.now();
},
timeEnd: function StatTimer_timeEnd(name) {
if (!this.enabled) {
return;
}
if (!(name in this.started)) {
warn('Timer has not been started for ' + name);
}
this.times.push({
'name': name,
'start': this.started[name],
'end': Date.now(),
});
// Remove timer from started so it can be called again.
delete this.started[name];
},
toString: function StatTimer_toString() {
var i, ii;
var times = this.times;
var out = '';
// Find the longest name for padding purposes.
var longest = 0;
for (i = 0, ii = times.length; i &lt; ii; ++i) {
var name = times[i]['name'];
if (name.length > longest) {
longest = name.length;
}
}
for (i = 0, ii = times.length; i &lt; ii; ++i) {
var span = times[i];
var duration = span.end - span.start;
out += rpad(span['name'], ' ', longest) + ' ' + duration + 'ms\n';
}
return out;
},
};
return StatTimer;
})();
var createBlob = function createBlob(data, contentType) {
if (typeof Blob !== 'undefined') {
return new Blob([data], { type: contentType, });
}
throw new Error('The "Blob" constructor is not supported.');
};
var createObjectURL = (function createObjectURLClosure() {
// Blob/createObjectURL is not available, falling back to data schema.
var digits =
'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
return function createObjectURL(data, contentType, forceDataSchema = false) {
if (!forceDataSchema &amp;&amp; URL.createObjectURL) {
var blob = createBlob(data, contentType);
return URL.createObjectURL(blob);
}
var buffer = 'data:' + contentType + ';base64,';
for (var i = 0, ii = data.length; i &lt; ii; i += 3) {
var b1 = data[i] &amp; 0xFF;
var b2 = data[i + 1] &amp; 0xFF;
var b3 = data[i + 2] &amp; 0xFF;
var d1 = b1 >> 2, d2 = ((b1 &amp; 3) &lt;&lt; 4) | (b2 >> 4);
var d3 = i + 1 &lt; ii ? ((b2 &amp; 0xF) &lt;&lt; 2) | (b3 >> 6) : 64;
var d4 = i + 2 &lt; ii ? (b3 &amp; 0x3F) : 64;
buffer += digits[d1] + digits[d2] + digits[d3] + digits[d4];
}
return buffer;
};
})();
function resolveCall(fn, args, thisArg = null) {
if (!fn) {
return Promise.resolve(undefined);
}
return new Promise((resolve, reject) => {
resolve(fn.apply(thisArg, args));
});
}
function resolveOrReject(capability, success, reason) {
if (success) {
capability.resolve();
} else {
capability.reject(reason);
}
}
function finalize(promise) {
return Promise.resolve(promise).catch(() => {});
}
function MessageHandler(sourceName, targetName, comObj) {
this.sourceName = sourceName;
this.targetName = targetName;
this.comObj = comObj;
this.callbackId = 1;
this.streamId = 1;
this.postMessageTransfers = true;
this.streamSinks = Object.create(null);
this.streamControllers = Object.create(null);
let callbacksCapabilities = this.callbacksCapabilities = Object.create(null);
let ah = this.actionHandler = Object.create(null);
this._onComObjOnMessage = (event) => {
let data = event.data;
if (data.targetName !== this.sourceName) {
return;
}
if (data.stream) {
this._processStreamMessage(data);
} else if (data.isReply) {
let callbackId = data.callbackId;
if (data.callbackId in callbacksCapabilities) {
let callback = callbacksCapabilities[callbackId];
delete callbacksCapabilities[callbackId];
if ('error' in data) {
callback.reject(data.error);
} else {
callback.resolve(data.data);
}
} else {
error('Cannot resolve callback ' + callbackId);
}
} else if (data.action in ah) {
let action = ah[data.action];
if (data.callbackId) {
let sourceName = this.sourceName;
let targetName = data.sourceName;
Promise.resolve().then(function () {
return action[0].call(action[1], data.data);
}).then((result) => {
comObj.postMessage({
sourceName,
targetName,
isReply: true,
callbackId: data.callbackId,
data: result,
});
}, (reason) => {
if (reason instanceof Error) {
// Serialize error to avoid "DataCloneError"
reason = reason + '';
}
comObj.postMessage({
sourceName,
targetName,
isReply: true,
callbackId: data.callbackId,
error: reason,
});
});
} else if (data.streamId) {
this._createStreamSink(data);
} else {
action[0].call(action[1], data.data);
}
} else {
error('Unknown action from worker: ' + data.action);
}
};
comObj.addEventListener('message', this._onComObjOnMessage);
}
MessageHandler.prototype = {
on(actionName, handler, scope) {
var ah = this.actionHandler;
if (ah[actionName]) {
error('There is already an actionName called "' + actionName + '"');
}
ah[actionName] = [handler, scope];
},
/**
* Sends a message to the comObj to invoke the action with the supplied data.
* @param {String} actionName - Action to call.
* @param {JSON} data - JSON data to send.
* @param {Array} [transfers] - Optional list of transfers/ArrayBuffers
*/
send(actionName, data, transfers) {
var message = {
sourceName: this.sourceName,
targetName: this.targetName,
action: actionName,
data,
};
this.postMessage(message, transfers);
},
/**
* Sends a message to the comObj to invoke the action with the supplied data.
* Expects that the other side will callback with the response.
* @param {String} actionName - Action to call.
* @param {JSON} data - JSON data to send.
* @param {Array} [transfers] - Optional list of transfers/ArrayBuffers.
* @returns {Promise} Promise to be resolved with response data.
*/
sendWithPromise(actionName, data, transfers) {
var callbackId = this.callbackId++;
var message = {
sourceName: this.sourceName,
targetName: this.targetName,
action: actionName,
data,
callbackId,
};
var capability = createPromiseCapability();
this.callbacksCapabilities[callbackId] = capability;
try {
this.postMessage(message, transfers);
} catch (e) {
capability.reject(e);
}
return capability.promise;
},
/**
* Sends a message to the comObj to invoke the action with the supplied data.
* Expect that the other side will callback to signal 'start_complete'.
* @param {String} actionName - Action to call.
* @param {JSON} data - JSON data to send.
* @param {Object} queueingStrategy - strategy to signal backpressure based on
* internal queue.
* @param {Array} [transfers] - Optional list of transfers/ArrayBuffers.
* @return {ReadableStream} ReadableStream to read data in chunks.
*/
sendWithStream(actionName, data, queueingStrategy, transfers) {
let streamId = this.streamId++;
let sourceName = this.sourceName;
let targetName = this.targetName;
return new ReadableStream({
start: (controller) => {
let startCapability = createPromiseCapability();
this.streamControllers[streamId] = {
controller,
startCall: startCapability,
};
this.postMessage({
sourceName,
targetName,
action: actionName,
streamId,
data,
desiredSize: controller.desiredSize,
});
// Return Promise for Async process, to signal success/failure.
return startCapability.promise;
},
pull: (controller) => {
let pullCapability = createPromiseCapability();
this.streamControllers[streamId].pullCall = pullCapability;
this.postMessage({
sourceName,
targetName,
stream: 'pull',
streamId,
desiredSize: controller.desiredSize,
});
// Returning Promise will not call "pull"
// again until current pull is resolved.
return pullCapability.promise;
},
cancel: (reason) => {
let cancelCapability = createPromiseCapability();
this.streamControllers[streamId].cancelCall = cancelCapability;
this.postMessage({
sourceName,
targetName,
stream: 'cancel',
reason,
streamId,
});
// Return Promise to signal success or failure.
return cancelCapability.promise;
},
}, queueingStrategy);
},
_createStreamSink(data) {
let self = this;
let action = this.actionHandler[data.action];
let streamId = data.streamId;
let desiredSize = data.desiredSize;
let sourceName = this.sourceName;
let targetName = data.sourceName;
let capability = createPromiseCapability();
let sendStreamRequest = ({ stream, chunk, success, reason, }) => {
this.comObj.postMessage({ sourceName, targetName, stream, streamId,
chunk, success, reason, });
};
let streamSink = {
enqueue(chunk, size = 1) {
let lastDesiredSize = this.desiredSize;
this.desiredSize -= size;
// Enqueue decreases the desiredSize property of sink,
// so when it changes from positive to negative,
// set ready as unresolved promise.
if (lastDesiredSize > 0 &amp;&amp; this.desiredSize &lt;= 0) {
this.sinkCapability = createPromiseCapability();
this.ready = this.sinkCapability.promise;
}
sendStreamRequest({ stream: 'enqueue', chunk, });
},
close() {
sendStreamRequest({ stream: 'close', });
delete self.streamSinks[streamId];
},
error(reason) {
sendStreamRequest({ stream: 'error', reason, });
},
sinkCapability: capability,
onPull: null,
onCancel: null,
desiredSize,
ready: null,
};
streamSink.sinkCapability.resolve();
streamSink.ready = streamSink.sinkCapability.promise;
this.streamSinks[streamId] = streamSink;
resolveCall(action[0], [data.data, streamSink], action[1]).then(() => {
sendStreamRequest({ stream: 'start_complete', success: true, });
}, (reason) => {
sendStreamRequest({ stream: 'start_complete', success: false, reason, });
});
},
_processStreamMessage(data) {
let sourceName = this.sourceName;
let targetName = data.sourceName;
let streamId = data.streamId;
let sendStreamResponse = ({ stream, success, reason, }) => {
this.comObj.postMessage({ sourceName, targetName, stream,
success, streamId, reason, });
};
let deleteStreamController = () => {
// Delete streamController only when start, pull and
// cancel callbacks are resolved, to avoid "TypeError".
Promise.all([
this.streamControllers[data.streamId].startCall,
this.streamControllers[data.streamId].pullCall,
this.streamControllers[data.streamId].cancelCall
].map(function(capability) {
return capability &amp;&amp; finalize(capability.promise);
})).then(() => {
delete this.streamControllers[data.streamId];
});
};
switch (data.stream) {
case 'start_complete':
resolveOrReject(this.streamControllers[data.streamId].startCall,
data.success, data.reason);
break;
case 'pull_complete':
resolveOrReject(this.streamControllers[data.streamId].pullCall,
data.success, data.reason);
break;
case 'pull':
// Ignore any pull after close is called.
if (!this.streamSinks[data.streamId]) {
sendStreamResponse({ stream: 'pull_complete', success: true, });
break;
}
// Pull increases the desiredSize property of sink,
// so when it changes from negative to positive,
// set ready property as resolved promise.
if (this.streamSinks[data.streamId].desiredSize &lt;= 0 &amp;&amp;
data.desiredSize > 0) {
this.streamSinks[data.streamId].sinkCapability.resolve();
}
// Reset desiredSize property of sink on every pull.
this.streamSinks[data.streamId].desiredSize = data.desiredSize;
resolveCall(this.streamSinks[data.streamId].onPull).then(() => {
sendStreamResponse({ stream: 'pull_complete', success: true, });
}, (reason) => {
sendStreamResponse({ stream: 'pull_complete',
success: false, reason, });
});
break;
case 'enqueue':
this.streamControllers[data.streamId].controller.enqueue(data.chunk);
break;
case 'close':
this.streamControllers[data.streamId].controller.close();
deleteStreamController();
break;
case 'error':
this.streamControllers[data.streamId].controller.error(data.reason);
deleteStreamController();
break;
case 'cancel_complete':
resolveOrReject(this.streamControllers[data.streamId].cancelCall,
data.success, data.reason);
deleteStreamController();
break;
case 'cancel':
resolveCall(this.streamSinks[data.streamId].onCancel,
[data.reason]).then(() => {
sendStreamResponse({ stream: 'cancel_complete', success: true, });
}, (reason) => {
sendStreamResponse({ stream: 'cancel_complete',
success: false, reason, });
});
delete this.streamSinks[data.streamId];
break;
default:
throw new Error('Unexpected stream case');
}
},
/**
* Sends raw message to the comObj.
* @private
* @param {Object} message - Raw message.
* @param transfers List of transfers/ArrayBuffers, or undefined.
*/
postMessage(message, transfers) {
if (transfers &amp;&amp; this.postMessageTransfers) {
this.comObj.postMessage(message, transfers);
} else {
this.comObj.postMessage(message);
}
},
destroy() {
this.comObj.removeEventListener('message', this._onComObjOnMessage);
},
};
function loadJpegStream(id, imageUrl, objs) {
var img = new Image();
img.onload = (function loadJpegStream_onloadClosure() {
objs.resolve(id, img);
});
img.onerror = (function loadJpegStream_onerrorClosure() {
objs.resolve(id, null);
warn('Error during JPEG image loading');
});
img.src = imageUrl;
}
export {
FONT_IDENTITY_MATRIX,
IDENTITY_MATRIX,
OPS,
VERBOSITY_LEVELS,
UNSUPPORTED_FEATURES,
AnnotationBorderStyleType,
AnnotationFieldFlag,
AnnotationFlag,
AnnotationType,
FontType,
ImageKind,
CMapCompressionType,
InvalidPDFException,
MessageHandler,
MissingDataException,
MissingPDFException,
NativeImageDecoding,
NotImplementedException,
PageViewport,
PasswordException,
PasswordResponses,
StatTimer,
StreamType,
TextRenderingMode,
UnexpectedResponseException,
UnknownErrorException,
Util,
XRefParseException,
arrayByteLength,
arraysToBytes,
assert,
bytesToString,
createBlob,
createPromiseCapability,
createObjectURL,
deprecated,
error,
getLookupTableFactory,
getVerbosityLevel,
globalScope,
info,
isArray,
isArrayBuffer,
isBool,
isEmptyObj,
isInt,
isNum,
isString,
isSpace,
isNodeJS,
isSameOrigin,
createValidAbsoluteUrl,
isLittleEndian,
isEvalSupported,
loadJpegStream,
log2,
readInt8,
readUint16,
readUint32,
removeNullCharacters,
ReadableStream,
setVerbosityLevel,
shadow,
string32,
stringToBytes,
stringToPDFString,
stringToUTF8String,
utf8StringToString,
warn,
};
</code></pre>
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