githubmirror/pdf.js

src/shared/util.js
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Calixte Denizet
Enable 'eslint-plugin-regexp' and fix existing findings
25 май 2026, 15:31
25 май 2026, 15:317bda0fc
/* 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 process */

// NW.js / Electron is a browser context, but copies some Node.js objects; see
// http://docs.nwjs.io/en/latest/For%20Users/Advanced/JavaScript%20Contexts%20in%20NW.js/#access-nodejs-and-nwjs-api-in-browser-context
// https://www.electronjs.org/docs/api/process#processversionselectron-readonly
// https://www.electronjs.org/docs/api/process#processtype-readonly
const isNodeJS =
  (typeof PDFJSDev === "undefined" || PDFJSDev.test("GENERIC")) &&
  typeof process === "object" &&
  process + "" === "[object process]" &&
  !process.versions.nw &&
  !(process.versions.electron && process.type && process.type !== "browser");

const BBOX_INIT = [Infinity, Infinity, -Infinity, -Infinity];
const F32_BBOX_INIT = new Float32Array(BBOX_INIT);

const FONT_IDENTITY_MATRIX = [0.001, 0, 0, 0.001, 0, 0];

// Represent the percentage of the height of a single-line field over
// the font size. Acrobat seems to use this value.
const LINE_FACTOR = 1.35;
const LINE_DESCENT_FACTOR = 0.35;
const BASELINE_FACTOR = LINE_DESCENT_FACTOR / LINE_FACTOR;

const SVG_NS = "http://www.w3.org/2000/svg";

/**
 * Refer to the `WorkerTransport.getRenderingIntent`-method in the API, to see
 * how these flags are being used:
 *  - ANY, DISPLAY, and PRINT are the normal rendering intents, note the
 *    `PDFPageProxy.{render, getOperatorList, getAnnotations}`-methods.
 *  - SAVE is used, on the worker-thread, when saving modified annotations.
 *  - ANNOTATIONS_FORMS, ANNOTATIONS_STORAGE, ANNOTATIONS_DISABLE control which
 *    annotations are rendered onto the canvas (i.e. by being included in the
 *    operatorList), note the `PDFPageProxy.{render, getOperatorList}`-methods
 *    and their `annotationMode`-option.
 *  - IS_EDITING is used when editing is active in the viewer.
 *  - OPLIST is used with the `PDFPageProxy.getOperatorList`-method, note the
 *    `OperatorList`-constructor (on the worker-thread).
 */
const RenderingIntentFlag = {
  ANY: 0x01,
  DISPLAY: 0x02,
  PRINT: 0x04,
  SAVE: 0x08,
  ANNOTATIONS_FORMS: 0x10,
  ANNOTATIONS_STORAGE: 0x20,
  ANNOTATIONS_DISABLE: 0x40,
  IS_EDITING: 0x80,
  OPLIST: 0x100,
};

const AnnotationMode = {
  DISABLE: 0,
  ENABLE: 1,
  ENABLE_FORMS: 2,
  ENABLE_STORAGE: 3,
};

const AnnotationPrefix = "pdfjs_internal_id_";
const AnnotationEditorPrefix = "pdfjs_internal_editor_";

const AnnotationEditorType = {
  DISABLE: -1,
  NONE: 0,
  FREETEXT: 3,
  HIGHLIGHT: 9,
  STAMP: 13,
  INK: 15,
  POPUP: 16,
  SIGNATURE: 101,
  COMMENT: 102,
};

const AnnotationEditorParamsType = {
  RESIZE: 1,
  CREATE: 2,
  FREETEXT_SIZE: 11,
  FREETEXT_COLOR: 12,
  FREETEXT_OPACITY: 13,
  INK_COLOR: 21,
  INK_THICKNESS: 22,
  INK_OPACITY: 23,
  INK_COLOR_AND_OPACITY: 24,
  HIGHLIGHT_COLOR: 31,
  HIGHLIGHT_THICKNESS: 32,
  HIGHLIGHT_FREE: 33,
  HIGHLIGHT_SHOW_ALL: 34,
  DRAW_STEP: 41,
};

// Permission flags from Table 22, Section 7.6.3.2 of the PDF specification.
const PermissionFlag = {
  PRINT: 0x04,
  MODIFY_CONTENTS: 0x08,
  COPY: 0x10,
  MODIFY_ANNOTATIONS: 0x20,
  FILL_INTERACTIVE_FORMS: 0x100,
  COPY_FOR_ACCESSIBILITY: 0x200,
  ASSEMBLE: 0x400,
  PRINT_HIGH_QUALITY: 0x800,
};

const MeshFigureType = {
  TRIANGLES: 1,
  LATTICE: 2,
  PATCH: 3,
};

const 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,
};

const ImageKind = {
  GRAYSCALE_1BPP: 1,
  RGB_24BPP: 2,
  RGBA_32BPP: 3,
};

const 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,
};

const AnnotationReplyType = {
  GROUP: "Group",
  REPLY: "R",
};

const AnnotationFlag = {
  INVISIBLE: 0x01,
  HIDDEN: 0x02,
  PRINT: 0x04,
  NOZOOM: 0x08,
  NOROTATE: 0x10,
  NOVIEW: 0x20,
  READONLY: 0x40,
  LOCKED: 0x80,
  TOGGLENOVIEW: 0x100,
  LOCKEDCONTENTS: 0x200,
};

const 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,
};

const AnnotationBorderStyleType = {
  SOLID: 1,
  DASHED: 2,
  BEVELED: 3,
  INSET: 4,
  UNDERLINE: 5,
};

const AnnotationActionEventType = {
  E: "Mouse Enter",
  X: "Mouse Exit",
  D: "Mouse Down",
  U: "Mouse Up",
  Fo: "Focus",
  Bl: "Blur",
  PO: "PageOpen",
  PC: "PageClose",
  PV: "PageVisible",
  PI: "PageInvisible",
  K: "Keystroke",
  F: "Format",
  V: "Validate",
  C: "Calculate",
};

const DocumentActionEventType = {
  WC: "WillClose",
  WS: "WillSave",
  DS: "DidSave",
  WP: "WillPrint",
  DP: "DidPrint",
};

const PageActionEventType = {
  O: "PageOpen",
  C: "PageClose",
};

const VerbosityLevel = {
  ERRORS: 0,
  WARNINGS: 1,
  INFOS: 5,
};

// All the possible operations for an operator list.
const OPS = {
  // Intentionally start from 1 so it is easy to spot bad operators that will be
  // 0's.
  // PLEASE NOTE: We purposely keep any removed operators commented out, since
  //              re-numbering the list would risk breaking third-party users.
  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,
  setStrokeTransparent: 92,
  setFillTransparent: 93,
  rawFillPath: 94,
};

// In order to have a switch statement that is fast (i.e. which use a jump
// table), we need to have the OPS in a contiguous range.
const DrawOPS = {
  moveTo: 0,
  lineTo: 1,
  curveTo: 2,
  quadraticCurveTo: 3,
  closePath: 4,
};

const PasswordResponses = {
  NEED_PASSWORD: 1,
  INCORRECT_PASSWORD: 2,
};

let verbosity = VerbosityLevel.WARNINGS;

function setVerbosityLevel(level) {
  if (Number.isInteger(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 >= VerbosityLevel.INFOS) {
    // eslint-disable-next-line no-console
    console.info(`Info: ${msg}`);
  }
}

// Non-fatal warnings.
function warn(msg) {
  if (verbosity >= VerbosityLevel.WARNINGS) {
    // eslint-disable-next-line no-console
    console.warn(`Warning: ${msg}`);
  }
}

function unreachable(msg) {
  throw new Error(msg);
}

function assert(cond, msg) {
  if (!cond) {
    unreachable(msg);
  }
}

// Checks if URLs use one of the allowed protocols, e.g. to avoid XSS.
function _isValidProtocol(url) {
  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.
 *
 * @param {URL|string} url - An absolute, or relative, URL.
 * @param {URL|string} [baseUrl] - An absolute URL.
 * @param {Object} [options]
 * @returns Either a valid {URL}, or `null` otherwise.
 */
function createValidAbsoluteUrl(url, baseUrl = null, options = null) {
  if (!url) {
    return null;
  }
  if (options && typeof url === "string") {
    // Let URLs beginning with "www." default to using the "http://" protocol.
    if (options.addDefaultProtocol && url.startsWith("www.")) {
      const dots = url.match(/\./g);
      // Avoid accidentally matching a *relative* URL pointing to a file named
      // e.g. "www.pdf" or similar.
      if (dots?.length >= 2) {
        url = `http://${url}`;
      }
    }

    // According to ISO 32000-1:2008, section 12.6.4.7, URIs should be encoded
    // in 7-bit ASCII. Some bad PDFs use UTF-8 encoding; see bug 1122280.
    if (options.tryConvertEncoding) {
      try {
        url = stringToUTF8String(url);
      } catch {}
    }
  }

  const absoluteUrl = baseUrl ? URL.parse(url, baseUrl) : URL.parse(url);
  return _isValidProtocol(absoluteUrl) ? absoluteUrl : null;
}

/**
 * Remove, or replace, the hash property of the URL.
 *
 * @param {URL|string} url - The absolute, or relative, URL.
 * @param {string} hash - The hash property (use an empty string to remove it).
 * @param {boolean} [allowRel] - Allow relative URLs.
 * @returns {string} The resulting URL string.
 */
function updateUrlHash(url, hash, allowRel = false) {
  const res = URL.parse(url);
  if (res) {
    res.hash = hash;
    return res.href;
  }
  // Support well-formed relative URLs, necessary for `web/app.js` in GENERIC
  // builds, by optionally falling back to string parsing.
  if (allowRel && createValidAbsoluteUrl(url, "http://example.com")) {
    return url.split("#", 1)[0] + `${hash ? `#${hash}` : ""}`;
  }
  return "";
}

// Extract the final component from a path string.
function stripPath(str) {
  return str.substring(str.lastIndexOf("/") + 1);
}

function shadow(obj, prop, value, nonSerializable = false) {
  if (typeof PDFJSDev === "undefined" || PDFJSDev.test("TESTING")) {
    assert(
      prop in obj,
      `shadow: Property "${prop && prop.toString()}" not found in object.`
    );
  }
  Object.defineProperty(obj, prop, {
    value,
    enumerable: !nonSerializable,
    configurable: true,
    writable: false,
  });
  return value;
}

/**
 * @type {any}
 */
const BaseException = (function BaseExceptionClosure() {
  // eslint-disable-next-line no-shadow
  function BaseException(message, name) {
    if (
      (typeof PDFJSDev === "undefined" || PDFJSDev.test("TESTING")) &&
      this.constructor === BaseException
    ) {
      unreachable("Cannot initialize BaseException.");
    }
    this.message = message;
    this.name = name;
  }
  BaseException.prototype = new Error();
  BaseException.constructor = BaseException;

  return BaseException;
})();

class PasswordException extends BaseException {
  constructor(msg, code) {
    super(msg, "PasswordException");
    this.code = code;
  }
}

class UnknownErrorException extends BaseException {
  constructor(msg, details) {
    super(msg, "UnknownErrorException");
    this.details = details;
  }
}

class InvalidPDFException extends BaseException {
  constructor(msg) {
    super(msg, "InvalidPDFException");
  }
}

class ResponseException extends BaseException {
  constructor(msg, status, missing) {
    super(msg, "ResponseException");
    this.status = status;
    this.missing = missing;
  }
}

/**
 * Error caused during parsing PDF data.
 */
class FormatError extends BaseException {
  constructor(msg) {
    super(msg, "FormatError");
  }
}

/**
 * Error used to indicate task cancellation.
 */
class AbortException extends BaseException {
  constructor(msg) {
    super(msg, "AbortException");
  }
}

function bytesToString(bytes) {
  if (typeof bytes !== "object" || bytes?.length === undefined) {
    unreachable("Invalid argument for bytesToString");
  }
  const length = bytes.length;
  const MAX_ARGUMENT_COUNT = 8192;
  if (length < MAX_ARGUMENT_COUNT) {
    return String.fromCharCode.apply(null, bytes);
  }
  const strBuf = [];
  for (let i = 0; i < length; i += MAX_ARGUMENT_COUNT) {
    const chunkEnd = Math.min(i + MAX_ARGUMENT_COUNT, length);
    const chunk = bytes.subarray(i, chunkEnd);
    strBuf.push(String.fromCharCode.apply(null, chunk));
  }
  return strBuf.join("");
}

function stringToBytes(str) {
  if (typeof str !== "string") {
    unreachable("Invalid argument for stringToBytes");
  }
  const length = str.length;
  const bytes = new Uint8Array(length);
  for (let i = 0; i < length; ++i) {
    bytes[i] = str.charCodeAt(i) & 0xff;
  }
  return bytes;
}

function objectSize(obj) {
  return Object.keys(obj).length;
}

class FeatureTest {
  static get isLittleEndian() {
    const buffer8 = new Uint8Array(4);
    buffer8[0] = 1;
    const view32 = new Uint32Array(buffer8.buffer, 0, 1);

    return shadow(this, "isLittleEndian", view32[0] === 1);
  }

  static get isOffscreenCanvasSupported() {
    return shadow(
      this,
      "isOffscreenCanvasSupported",
      typeof OffscreenCanvas !== "undefined"
    );
  }

  static get isImageDecoderSupported() {
    return shadow(
      this,
      "isImageDecoderSupported",
      typeof ImageDecoder !== "undefined"
    );
  }

  static get isFloat16ArraySupported() {
    return shadow(
      this,
      "isFloat16ArraySupported",
      typeof Float16Array !== "undefined"
    );
  }

  static get isSanitizerSupported() {
    return shadow(
      this,
      "isSanitizerSupported",
      typeof Sanitizer !== "undefined"
    );
  }

  static get platform() {
    const { platform, userAgent } = navigator;

    return shadow(this, "platform", {
      isAndroid: userAgent.includes("Android"),
      isLinux: platform.includes("Linux"),
      isMac: platform.includes("Mac"),
      isWindows: platform.includes("Win"),
      isFirefox:
        (typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")) ||
        userAgent.includes("Firefox"),
    });
  }

  static get isCanvasFilterSupported() {
    let ctx;
    if (this.isOffscreenCanvasSupported) {
      ctx = new OffscreenCanvas(1, 1).getContext("2d");
    } else if (
      (typeof PDFJSDev === "undefined" || !PDFJSDev.test("WORKER_THREAD")) &&
      typeof document !== "undefined"
    ) {
      ctx = document.createElement("canvas").getContext("2d");
    }
    // Spec-compliant Canvas2D defaults `ctx.filter` to "none". On
    // browsers without filter support (Safari) the property is absent
    // until you assign to it, after which it behaves like an ordinary
    // JS property and stores whatever string you set without applying
    // it. Probing the default lets us detect the difference reliably.
    return shadow(this, "isCanvasFilterSupported", ctx?.filter !== undefined);
  }

  static get isAlphaColorInputSupported() {
    if (
      (typeof PDFJSDev !== "undefined" && PDFJSDev.test("WORKER_THREAD")) ||
      typeof document === "undefined"
    ) {
      return shadow(this, "isAlphaColorInputSupported", false);
    }
    const input = document.createElement("input");
    input.type = "color";
    input.setAttribute("alpha", "");
    input.value = "#ff000080";
    // If alpha is supported the color picker retains the alpha channel, so
    // the value won't be a plain opaque color (7-char #rrggbb).
    return shadow(
      this,
      "isAlphaColorInputSupported",
      input.value !== "#ff0000"
    );
  }
}

class Util {
  static get hexNums() {
    return shadow(
      this,
      "hexNums",
      Array.from(Array(256).keys(), n => n.toString(16).padStart(2, "0"))
    );
  }

  static makeHexColor(r, g, b) {
    return `#${this.hexNums[r]}${this.hexNums[g]}${this.hexNums[b]}`;
  }

  // Concatenates two transformation matrices together and returns the result.
  static 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],
    ];
  }

  // Multiplies m (an array-based transform) by md (a DOMMatrix transform).
  static multiplyByDOMMatrix(m, md) {
    return [
      m[0] * md.a + m[2] * md.b,
      m[1] * md.a + m[3] * md.b,
      m[0] * md.c + m[2] * md.d,
      m[1] * md.c + m[3] * md.d,
      m[0] * md.e + m[2] * md.f + m[4],
      m[1] * md.e + m[3] * md.f + m[5],
    ];
  }

  // For 2d affine transforms
  static applyTransform(p, m, pos = 0) {
    const p0 = p[pos];
    const p1 = p[pos + 1];
    p[pos] = p0 * m[0] + p1 * m[2] + m[4];
    p[pos + 1] = p0 * m[1] + p1 * m[3] + m[5];
  }

  static applyTransformToBezier(p, transform, pos = 0) {
    const m0 = transform[0];
    const m1 = transform[1];
    const m2 = transform[2];
    const m3 = transform[3];
    const m4 = transform[4];
    const m5 = transform[5];
    for (let i = 0; i < 6; i += 2) {
      const pI = p[pos + i];
      const pI1 = p[pos + i + 1];
      p[pos + i] = pI * m0 + pI1 * m2 + m4;
      p[pos + i + 1] = pI * m1 + pI1 * m3 + m5;
    }
  }

  static applyInverseTransform(p, m) {
    const p0 = p[0];
    const p1 = p[1];
    const d = m[0] * m[3] - m[1] * m[2];
    p[0] = (p0 * m[3] - p1 * m[2] + m[2] * m[5] - m[4] * m[3]) / d;
    p[1] = (-p0 * m[1] + p1 * m[0] + m[4] * m[1] - m[5] * m[0]) / d;
  }

  // Applies the transform to the rectangle and finds the minimum axially
  // aligned bounding box.
  static axialAlignedBoundingBox(rect, transform, output) {
    const m0 = transform[0];
    const m1 = transform[1];
    const m2 = transform[2];
    const m3 = transform[3];
    const m4 = transform[4];
    const m5 = transform[5];
    const r0 = rect[0];
    const r1 = rect[1];
    const r2 = rect[2];
    const r3 = rect[3];

    let a0 = m0 * r0 + m4;
    let a2 = a0;
    let a1 = m0 * r2 + m4;
    let a3 = a1;
    let b0 = m3 * r1 + m5;
    let b2 = b0;
    let b1 = m3 * r3 + m5;
    let b3 = b1;

    if (m1 !== 0 || m2 !== 0) {
      // Non-scaling matrix: shouldn't be frequent.
      const m1r0 = m1 * r0;
      const m1r2 = m1 * r2;
      const m2r1 = m2 * r1;
      const m2r3 = m2 * r3;
      a0 += m2r1;
      a3 += m2r1;
      a1 += m2r3;
      a2 += m2r3;
      b0 += m1r0;
      b3 += m1r0;
      b1 += m1r2;
      b2 += m1r2;
    }

    output[0] = Math.min(output[0], a0, a1, a2, a3);
    output[1] = Math.min(output[1], b0, b1, b2, b3);
    output[2] = Math.max(output[2], a0, a1, a2, a3);
    output[3] = Math.max(output[3], b0, b1, b2, b3);
  }

  static inverseTransform(m) {
    const 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,
    ];
  }

  // 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.
  static singularValueDecompose2dScale(matrix, output) {
    const m0 = matrix[0];
    const m1 = matrix[1];
    const m2 = matrix[2];
    const m3 = matrix[3];
    // Multiply matrix m with its transpose.
    const a = m0 ** 2 + m1 ** 2;
    const b = m0 * m2 + m1 * m3;
    const c = m2 ** 2 + m3 ** 2;

    // Solve the second degree polynomial to get roots.
    const first = (a + c) / 2;
    const second = Math.sqrt(first ** 2 - (a * c - b ** 2));
    output[0] = Math.sqrt(first + second || 1);
    output[1] = Math.sqrt(first - second || 1);
  }

  // Normalize rectangle rect=[x1, y1, x2, y2] so that (x1,y1) < (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.
  static normalizeRect(rect) {
    const 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 'null'
  // The rectangle coordinates of rect1, rect2 should be [x1, y1, x2, y2]
  static intersect(rect1, rect2) {
    const xLow = Math.max(
      Math.min(rect1[0], rect1[2]),
      Math.min(rect2[0], rect2[2])
    );
    const xHigh = Math.min(
      Math.max(rect1[0], rect1[2]),
      Math.max(rect2[0], rect2[2])
    );
    if (xLow > xHigh) {
      return null;
    }
    const yLow = Math.max(
      Math.min(rect1[1], rect1[3]),
      Math.min(rect2[1], rect2[3])
    );
    const yHigh = Math.min(
      Math.max(rect1[1], rect1[3]),
      Math.max(rect2[1], rect2[3])
    );
    if (yLow > yHigh) {
      return null;
    }

    return [xLow, yLow, xHigh, yHigh];
  }

  static pointBoundingBox(x, y, minMax) {
    minMax[0] = Math.min(minMax[0], x);
    minMax[1] = Math.min(minMax[1], y);
    minMax[2] = Math.max(minMax[2], x);
    minMax[3] = Math.max(minMax[3], y);
  }

  static rectBoundingBox(x0, y0, x1, y1, minMax) {
    minMax[0] = Math.min(minMax[0], x0, x1);
    minMax[1] = Math.min(minMax[1], y0, y1);
    minMax[2] = Math.max(minMax[2], x0, x1);
    minMax[3] = Math.max(minMax[3], y0, y1);
  }

  static #getExtremumOnCurve(x0, x1, x2, x3, y0, y1, y2, y3, t, minMax) {
    if (t <= 0 || t >= 1) {
      return;
    }
    const mt = 1 - t;
    const tt = t * t;
    const ttt = tt * t;
    const x = mt * (mt * (mt * x0 + 3 * t * x1) + 3 * tt * x2) + ttt * x3;
    const y = mt * (mt * (mt * y0 + 3 * t * y1) + 3 * tt * y2) + ttt * y3;
    minMax[0] = Math.min(minMax[0], x);
    minMax[1] = Math.min(minMax[1], y);
    minMax[2] = Math.max(minMax[2], x);
    minMax[3] = Math.max(minMax[3], y);
  }

  static #getExtremum(x0, x1, x2, x3, y0, y1, y2, y3, a, b, c, minMax) {
    if (Math.abs(a) < 1e-12) {
      if (Math.abs(b) >= 1e-12) {
        this.#getExtremumOnCurve(
          x0,
          x1,
          x2,
          x3,
          y0,
          y1,
          y2,
          y3,
          -c / b,
          minMax
        );
      }
      return;
    }

    const delta = b ** 2 - 4 * c * a;
    if (delta < 0) {
      return;
    }
    const sqrtDelta = Math.sqrt(delta);
    const a2 = 2 * a;
    this.#getExtremumOnCurve(
      x0,
      x1,
      x2,
      x3,
      y0,
      y1,
      y2,
      y3,
      (-b + sqrtDelta) / a2,
      minMax
    );
    this.#getExtremumOnCurve(
      x0,
      x1,
      x2,
      x3,
      y0,
      y1,
      y2,
      y3,
      (-b - sqrtDelta) / a2,
      minMax
    );
  }

  // From https://github.com/adobe-webplatform/Snap.svg/blob/b365287722a72526000ac4bfcf0ce4cac2faa015/src/path.js#L852
  static bezierBoundingBox(x0, y0, x1, y1, x2, y2, x3, y3, minMax) {
    minMax[0] = Math.min(minMax[0], x0, x3);
    minMax[1] = Math.min(minMax[1], y0, y3);
    minMax[2] = Math.max(minMax[2], x0, x3);
    minMax[3] = Math.max(minMax[3], y0, y3);

    this.#getExtremum(
      x0,
      x1,
      x2,
      x3,
      y0,
      y1,
      y2,
      y3,
      3 * (-x0 + 3 * (x1 - x2) + x3),
      6 * (x0 - 2 * x1 + x2),
      3 * (x1 - x0),
      minMax
    );
    this.#getExtremum(
      x0,
      x1,
      x2,
      x3,
      y0,
      y1,
      y2,
      y3,
      3 * (-y0 + 3 * (y1 - y2) + y3),
      6 * (y0 - 2 * y1 + y2),
      3 * (y1 - y0),
      minMax
    );
  }
}

function stringToUTF8String(str) {
  return decodeURIComponent(escape(str));
}

function utf8StringToString(str) {
  return unescape(encodeURIComponent(str));
}

function isArrayEqual(arr1, arr2) {
  if (arr1.length !== arr2.length) {
    return false;
  }
  for (let i = 0, ii = arr1.length; i < ii; i++) {
    if (arr1[i] !== arr2[i]) {
      return false;
    }
  }
  return true;
}

let NormalizeRegex = null;
let NormalizationMap = null;
function normalizeUnicode(str) {
  if (!NormalizeRegex) {
    // In order to generate the following regex:
    //  - create a PDF containing all the chars in the range 0000-FFFF with
    //    a NFKC which is different of the char.
    //  - copy and paste all those chars and get the ones where NFKC is
    //    required.
    // It appears that most the chars here contain some ligatures.
    NormalizeRegex =
      /([\u00a0\u00b5\u037e\u0eb3\u2000-\u200a\u202f\u2126\ufb00-\ufb04\ufb06\ufb20-\ufb36\ufb38-\ufb3c\ufb3e\ufb40\ufb41\ufb43\ufb44\ufb46-\ufba1\ufba4-\ufba9\ufbae-\ufbb1\ufbd3-\ufbdc\ufbde-\ufbe7\ufbea-\ufbf8\ufbfc\ufbfd\ufc00-\ufc5d\ufc64-\ufcf1\ufcf5-\ufd3d\ufd88\ufdf4\ufdfa\ufdfb\ufe71\ufe77\ufe79\ufe7b\ufe7d]+)|(\ufb05+)/gu;
    NormalizationMap = new Map([["ﬅ", "ſt"]]);
  }
  return str.replaceAll(NormalizeRegex, (_, p1, p2) =>
    p1 ? p1.normalize("NFKC") : NormalizationMap.get(p2)
  );
}

function getUuid() {
  if (
    (typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")) ||
    typeof crypto.randomUUID === "function"
  ) {
    return crypto.randomUUID();
  }
  const buf = new Uint8Array(32);
  crypto.getRandomValues(buf);
  return bytesToString(buf);
}

function _isValidExplicitDest(validRef, validName, dest) {
  if (!Array.isArray(dest) || dest.length < 2) {
    return false;
  }
  const [page, zoom, ...args] = dest;
  if (!validRef(page) && !Number.isInteger(page)) {
    return false;
  }
  if (!validName(zoom)) {
    return false;
  }
  const argsLen = args.length;
  let allowNull = true;
  switch (zoom.name) {
    case "XYZ":
      if (argsLen < 2 || argsLen > 3) {
        return false;
      }
      break;
    case "Fit":
    case "FitB":
      return argsLen === 0;
    case "FitH":
    case "FitBH":
    case "FitV":
    case "FitBV":
      if (argsLen > 1) {
        return false;
      }
      break;
    case "FitR":
      if (argsLen !== 4) {
        return false;
      }
      allowNull = false;
      break;
    default:
      return false;
  }
  for (const arg of args) {
    if (typeof arg === "number" || (allowNull && arg === null)) {
      continue;
    }
    return false;
  }
  return true;
}

// Helpers for simple `Map.prototype.getOrInsertComputed()` invocations,
// to avoid duplicate function creation.
const makeArr = () => [];
const makeMap = () => new Map();
const makeObj = () => Object.create(null);

// See https://developer.mozilla.org/en-US/docs/Web/API/Blob/bytes#browser_compatibility
if (
  typeof PDFJSDev !== "undefined" &&
  !PDFJSDev.test("SKIP_BABEL") &&
  typeof Blob.prototype.bytes !== "function"
) {
  Blob.prototype.bytes = async function () {
    return new Uint8Array(await this.arrayBuffer());
  };
}

// See https://developer.mozilla.org/en-US/docs/Web/API/Response/bytes#browser_compatibility
if (
  typeof PDFJSDev !== "undefined" &&
  !PDFJSDev.test("SKIP_BABEL") &&
  typeof Response.prototype.bytes !== "function"
) {
  Response.prototype.bytes = async function () {
    return new Uint8Array(await this.arrayBuffer());
  };
}

export {
  _isValidExplicitDest,
  AbortException,
  AnnotationActionEventType,
  AnnotationBorderStyleType,
  AnnotationEditorParamsType,
  AnnotationEditorPrefix,
  AnnotationEditorType,
  AnnotationFieldFlag,
  AnnotationFlag,
  AnnotationMode,
  AnnotationPrefix,
  AnnotationReplyType,
  AnnotationType,
  assert,
  BaseException,
  BASELINE_FACTOR,
  BBOX_INIT,
  bytesToString,
  createValidAbsoluteUrl,
  DocumentActionEventType,
  DrawOPS,
  F32_BBOX_INIT,
  FeatureTest,
  FONT_IDENTITY_MATRIX,
  FormatError,
  getUuid,
  getVerbosityLevel,
  ImageKind,
  info,
  InvalidPDFException,
  isArrayEqual,
  isNodeJS,
  LINE_DESCENT_FACTOR,
  LINE_FACTOR,
  makeArr,
  makeMap,
  makeObj,
  MeshFigureType,
  normalizeUnicode,
  objectSize,
  OPS,
  PageActionEventType,
  PasswordException,
  PasswordResponses,
  PermissionFlag,
  RenderingIntentFlag,
  ResponseException,
  setVerbosityLevel,
  shadow,
  stringToBytes,
  stringToUTF8String,
  stripPath,
  SVG_NS,
  TextRenderingMode,
  UnknownErrorException,
  unreachable,
  updateUrlHash,
  utf8StringToString,
  Util,
  VerbosityLevel,
  warn,
};