pdfjs-dist/lib/core/evaluator.js

Generic build of Mozilla's PDF.js library.

/**
 * @licstart The following is the entire license notice for the
 * Javascript code in this page
 *
 * Copyright 2021 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.
 *
 * @licend The above is the entire license notice for the
 * Javascript code in this page
 */
"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.PartialEvaluator = exports.EvaluatorPreprocessor = void 0;

var _util = require("../shared/util.js");

var _cmap = require("./cmap.js");

var _primitives = require("./primitives.js");

var _stream = require("./stream.js");

var _fonts = require("./fonts.js");

var _encodings = require("./encodings.js");

var _unicode = require("./unicode.js");

var _standard_fonts = require("./standard_fonts.js");

var _pattern = require("./pattern.js");

var _function = require("./function.js");

var _parser = require("./parser.js");

var _image_utils = require("./image_utils.js");

var _bidi = require("./bidi.js");

var _colorspace = require("./colorspace.js");

var _glyphlist = require("./glyphlist.js");

var _core_utils = require("./core_utils.js");

var _metrics = require("./metrics.js");

var _murmurhash = require("./murmurhash3.js");

var _operator_list = require("./operator_list.js");

var _image = require("./image.js");

const DefaultPartialEvaluatorOptions = Object.freeze({
  maxImageSize: -1,
  disableFontFace: false,
  ignoreErrors: false,
  isEvalSupported: true,
  fontExtraProperties: false
});
const PatternType = {
  TILING: 1,
  SHADING: 2
};
const deferred = Promise.resolve();

function normalizeBlendMode(value, parsingArray = false) {
  if (Array.isArray(value)) {
    for (let i = 0, ii = value.length; i < ii; i++) {
      const maybeBM = normalizeBlendMode(value[i], true);

      if (maybeBM) {
        return maybeBM;
      }
    }

    (0, _util.warn)(`Unsupported blend mode Array: ${value}`);
    return "source-over";
  }

  if (!(0, _primitives.isName)(value)) {
    if (parsingArray) {
      return null;
    }

    return "source-over";
  }

  switch (value.name) {
    case "Normal":
    case "Compatible":
      return "source-over";

    case "Multiply":
      return "multiply";

    case "Screen":
      return "screen";

    case "Overlay":
      return "overlay";

    case "Darken":
      return "darken";

    case "Lighten":
      return "lighten";

    case "ColorDodge":
      return "color-dodge";

    case "ColorBurn":
      return "color-burn";

    case "HardLight":
      return "hard-light";

    case "SoftLight":
      return "soft-light";

    case "Difference":
      return "difference";

    case "Exclusion":
      return "exclusion";

    case "Hue":
      return "hue";

    case "Saturation":
      return "saturation";

    case "Color":
      return "color";

    case "Luminosity":
      return "luminosity";
  }

  if (parsingArray) {
    return null;
  }

  (0, _util.warn)(`Unsupported blend mode: ${value.name}`);
  return "source-over";
}

class TimeSlotManager {
  static get TIME_SLOT_DURATION_MS() {
    return (0, _util.shadow)(this, "TIME_SLOT_DURATION_MS", 20);
  }

  static get CHECK_TIME_EVERY() {
    return (0, _util.shadow)(this, "CHECK_TIME_EVERY", 100);
  }

  constructor() {
    this.reset();
  }

  check() {
    if (++this.checked < TimeSlotManager.CHECK_TIME_EVERY) {
      return false;
    }

    this.checked = 0;
    return this.endTime <= Date.now();
  }

  reset() {
    this.endTime = Date.now() + TimeSlotManager.TIME_SLOT_DURATION_MS;
    this.checked = 0;
  }

}

class PartialEvaluator {
  constructor({
    xref,
    handler,
    pageIndex,
    idFactory,
    fontCache,
    builtInCMapCache,
    globalImageCache,
    options = null
  }) {
    this.xref = xref;
    this.handler = handler;
    this.pageIndex = pageIndex;
    this.idFactory = idFactory;
    this.fontCache = fontCache;
    this.builtInCMapCache = builtInCMapCache;
    this.globalImageCache = globalImageCache;
    this.options = options || DefaultPartialEvaluatorOptions;
    this.parsingType3Font = false;
    this._fetchBuiltInCMapBound = this.fetchBuiltInCMap.bind(this);
  }

  get _pdfFunctionFactory() {
    const pdfFunctionFactory = new _function.PDFFunctionFactory({
      xref: this.xref,
      isEvalSupported: this.options.isEvalSupported
    });
    return (0, _util.shadow)(this, "_pdfFunctionFactory", pdfFunctionFactory);
  }

  clone(newOptions = DefaultPartialEvaluatorOptions) {
    var newEvaluator = Object.create(this);
    newEvaluator.options = newOptions;
    return newEvaluator;
  }

  hasBlendModes(resources, nonBlendModesSet) {
    if (!(resources instanceof _primitives.Dict)) {
      return false;
    }

    if (resources.objId && nonBlendModesSet.has(resources.objId)) {
      return false;
    }

    const processed = new _primitives.RefSet(nonBlendModesSet);

    if (resources.objId) {
      processed.put(resources.objId);
    }

    var nodes = [resources],
        xref = this.xref;

    while (nodes.length) {
      var node = nodes.shift();
      var graphicStates = node.get("ExtGState");

      if (graphicStates instanceof _primitives.Dict) {
        for (let graphicState of graphicStates.getRawValues()) {
          if (graphicState instanceof _primitives.Ref) {
            if (processed.has(graphicState)) {
              continue;
            }

            try {
              graphicState = xref.fetch(graphicState);
            } catch (ex) {
              processed.put(graphicState);
              (0, _util.info)(`hasBlendModes - ignoring ExtGState: "${ex}".`);
              continue;
            }
          }

          if (!(graphicState instanceof _primitives.Dict)) {
            continue;
          }

          if (graphicState.objId) {
            processed.put(graphicState.objId);
          }

          const bm = graphicState.get("BM");

          if (bm instanceof _primitives.Name) {
            if (bm.name !== "Normal") {
              return true;
            }

            continue;
          }

          if (bm !== undefined && Array.isArray(bm)) {
            for (const element of bm) {
              if (element instanceof _primitives.Name && element.name !== "Normal") {
                return true;
              }
            }
          }
        }
      }

      var xObjects = node.get("XObject");

      if (!(xObjects instanceof _primitives.Dict)) {
        continue;
      }

      for (let xObject of xObjects.getRawValues()) {
        if (xObject instanceof _primitives.Ref) {
          if (processed.has(xObject)) {
            continue;
          }

          try {
            xObject = xref.fetch(xObject);
          } catch (ex) {
            processed.put(xObject);
            (0, _util.info)(`hasBlendModes - ignoring XObject: "${ex}".`);
            continue;
          }
        }

        if (!(0, _primitives.isStream)(xObject)) {
          continue;
        }

        if (xObject.dict.objId) {
          processed.put(xObject.dict.objId);
        }

        var xResources = xObject.dict.get("Resources");

        if (!(xResources instanceof _primitives.Dict)) {
          continue;
        }

        if (xResources.objId && processed.has(xResources.objId)) {
          continue;
        }

        nodes.push(xResources);

        if (xResources.objId) {
          processed.put(xResources.objId);
        }
      }
    }

    processed.forEach(ref => {
      nonBlendModesSet.put(ref);
    });
    return false;
  }

  async fetchBuiltInCMap(name) {
    const cachedData = this.builtInCMapCache.get(name);

    if (cachedData) {
      return cachedData;
    }

    const readableStream = this.handler.sendWithStream("FetchBuiltInCMap", {
      name
    });
    const reader = readableStream.getReader();
    const data = await new Promise(function (resolve, reject) {
      function pump() {
        reader.read().then(function ({
          value,
          done
        }) {
          if (done) {
            return;
          }

          resolve(value);
          pump();
        }, reject);
      }

      pump();
    });

    if (data.compressionType !== _util.CMapCompressionType.NONE) {
      this.builtInCMapCache.set(name, data);
    }

    return data;
  }

  async buildFormXObject(resources, xobj, smask, operatorList, task, initialState, localColorSpaceCache) {
    var dict = xobj.dict;
    var matrix = dict.getArray("Matrix");
    var bbox = dict.getArray("BBox");

    if (Array.isArray(bbox) && bbox.length === 4) {
      bbox = _util.Util.normalizeRect(bbox);
    } else {
      bbox = null;
    }

    let optionalContent = null;

    if (dict.has("OC")) {
      optionalContent = await this.parseMarkedContentProps(dict.get("OC"), resources);
      operatorList.addOp(_util.OPS.beginMarkedContentProps, ["OC", optionalContent]);
    }

    var group = dict.get("Group");

    if (group) {
      var groupOptions = {
        matrix,
        bbox,
        smask,
        isolated: false,
        knockout: false
      };
      var groupSubtype = group.get("S");
      var colorSpace = null;

      if ((0, _primitives.isName)(groupSubtype, "Transparency")) {
        groupOptions.isolated = group.get("I") || false;
        groupOptions.knockout = group.get("K") || false;

        if (group.has("CS")) {
          const cs = group.getRaw("CS");

          const cachedColorSpace = _colorspace.ColorSpace.getCached(cs, this.xref, localColorSpaceCache);

          if (cachedColorSpace) {
            colorSpace = cachedColorSpace;
          } else {
            colorSpace = await this.parseColorSpace({
              cs,
              resources,
              localColorSpaceCache
            });
          }
        }
      }

      if (smask && smask.backdrop) {
        colorSpace = colorSpace || _colorspace.ColorSpace.singletons.rgb;
        smask.backdrop = colorSpace.getRgb(smask.backdrop, 0);
      }

      operatorList.addOp(_util.OPS.beginGroup, [groupOptions]);
    }

    operatorList.addOp(_util.OPS.paintFormXObjectBegin, [matrix, bbox]);
    return this.getOperatorList({
      stream: xobj,
      task,
      resources: dict.get("Resources") || resources,
      operatorList,
      initialState
    }).then(function () {
      operatorList.addOp(_util.OPS.paintFormXObjectEnd, []);

      if (group) {
        operatorList.addOp(_util.OPS.endGroup, [groupOptions]);
      }

      if (optionalContent) {
        operatorList.addOp(_util.OPS.endMarkedContent, []);
      }
    });
  }

  _sendImgData(objId, imgData, cacheGlobally = false) {
    const transfers = imgData ? [imgData.data.buffer] : null;

    if (this.parsingType3Font || cacheGlobally) {
      return this.handler.send("commonobj", [objId, "Image", imgData], transfers);
    }

    return this.handler.send("obj", [objId, this.pageIndex, "Image", imgData], transfers);
  }

  async buildPaintImageXObject({
    resources,
    image,
    isInline = false,
    operatorList,
    cacheKey,
    localImageCache,
    localColorSpaceCache
  }) {
    var dict = image.dict;
    const imageRef = dict.objId;
    var w = dict.get("Width", "W");
    var h = dict.get("Height", "H");

    if (!(w && (0, _util.isNum)(w)) || !(h && (0, _util.isNum)(h))) {
      (0, _util.warn)("Image dimensions are missing, or not numbers.");
      return undefined;
    }

    var maxImageSize = this.options.maxImageSize;

    if (maxImageSize !== -1 && w * h > maxImageSize) {
      (0, _util.warn)("Image exceeded maximum allowed size and was removed.");
      return undefined;
    }

    var imageMask = dict.get("ImageMask", "IM") || false;
    var imgData, args;

    if (imageMask) {
      var width = dict.get("Width", "W");
      var height = dict.get("Height", "H");
      var bitStrideLength = width + 7 >> 3;
      var imgArray = image.getBytes(bitStrideLength * height, true);
      var decode = dict.getArray("Decode", "D");
      imgData = _image.PDFImage.createMask({
        imgArray,
        width,
        height,
        imageIsFromDecodeStream: image instanceof _stream.DecodeStream,
        inverseDecode: !!decode && decode[0] > 0
      });
      imgData.cached = !!cacheKey;
      args = [imgData];
      operatorList.addOp(_util.OPS.paintImageMaskXObject, args);

      if (cacheKey) {
        localImageCache.set(cacheKey, imageRef, {
          fn: _util.OPS.paintImageMaskXObject,
          args
        });
      }

      return undefined;
    }

    var softMask = dict.get("SMask", "SM") || false;
    var mask = dict.get("Mask") || false;
    var SMALL_IMAGE_DIMENSIONS = 200;

    if (isInline && !softMask && !mask && w + h < SMALL_IMAGE_DIMENSIONS) {
      const imageObj = new _image.PDFImage({
        xref: this.xref,
        res: resources,
        image,
        isInline,
        pdfFunctionFactory: this._pdfFunctionFactory,
        localColorSpaceCache
      });
      imgData = imageObj.createImageData(true);
      operatorList.addOp(_util.OPS.paintInlineImageXObject, [imgData]);
      return undefined;
    }

    let objId = `img_${this.idFactory.createObjId()}`,
        cacheGlobally = false;

    if (this.parsingType3Font) {
      objId = `${this.idFactory.getDocId()}_type3_${objId}`;
    } else if (imageRef) {
      cacheGlobally = this.globalImageCache.shouldCache(imageRef, this.pageIndex);

      if (cacheGlobally) {
        objId = `${this.idFactory.getDocId()}_${objId}`;
      }
    }

    operatorList.addDependency(objId);
    args = [objId, w, h];

    _image.PDFImage.buildImage({
      xref: this.xref,
      res: resources,
      image,
      isInline,
      pdfFunctionFactory: this._pdfFunctionFactory,
      localColorSpaceCache
    }).then(imageObj => {
      imgData = imageObj.createImageData(false);

      if (cacheKey && imageRef && cacheGlobally) {
        this.globalImageCache.addByteSize(imageRef, imgData.data.length);
      }

      return this._sendImgData(objId, imgData, cacheGlobally);
    }).catch(reason => {
      (0, _util.warn)(`Unable to decode image "${objId}": "${reason}".`);
      return this._sendImgData(objId, null, cacheGlobally);
    });

    operatorList.addOp(_util.OPS.paintImageXObject, args);

    if (cacheKey) {
      localImageCache.set(cacheKey, imageRef, {
        fn: _util.OPS.paintImageXObject,
        args
      });

      if (imageRef) {
        (0, _util.assert)(!isInline, "Cannot cache an inline image globally.");
        this.globalImageCache.addPageIndex(imageRef, this.pageIndex);

        if (cacheGlobally) {
          this.globalImageCache.setData(imageRef, {
            objId,
            fn: _util.OPS.paintImageXObject,
            args,
            byteSize: 0
          });
        }
      }
    }

    return undefined;
  }

  handleSMask(smask, resources, operatorList, task, stateManager, localColorSpaceCache) {
    var smaskContent = smask.get("G");
    var smaskOptions = {
      subtype: smask.get("S").name,
      backdrop: smask.get("BC")
    };
    var transferObj = smask.get("TR");

    if ((0, _function.isPDFFunction)(transferObj)) {
      const transferFn = this._pdfFunctionFactory.create(transferObj);

      var transferMap = new Uint8Array(256);
      var tmp = new Float32Array(1);

      for (var i = 0; i < 256; i++) {
        tmp[0] = i / 255;
        transferFn(tmp, 0, tmp, 0);
        transferMap[i] = tmp[0] * 255 | 0;
      }

      smaskOptions.transferMap = transferMap;
    }

    return this.buildFormXObject(resources, smaskContent, smaskOptions, operatorList, task, stateManager.state.clone(), localColorSpaceCache);
  }

  handleTransferFunction(tr) {
    let transferArray;

    if (Array.isArray(tr)) {
      transferArray = tr;
    } else if ((0, _function.isPDFFunction)(tr)) {
      transferArray = [tr];
    } else {
      return null;
    }

    const transferMaps = [];
    let numFns = 0,
        numEffectfulFns = 0;

    for (const entry of transferArray) {
      const transferObj = this.xref.fetchIfRef(entry);
      numFns++;

      if ((0, _primitives.isName)(transferObj, "Identity")) {
        transferMaps.push(null);
        continue;
      } else if (!(0, _function.isPDFFunction)(transferObj)) {
        return null;
      }

      const transferFn = this._pdfFunctionFactory.create(transferObj);

      const transferMap = new Uint8Array(256),
            tmp = new Float32Array(1);

      for (let j = 0; j < 256; j++) {
        tmp[0] = j / 255;
        transferFn(tmp, 0, tmp, 0);
        transferMap[j] = tmp[0] * 255 | 0;
      }

      transferMaps.push(transferMap);
      numEffectfulFns++;
    }

    if (!(numFns === 1 || numFns === 4)) {
      return null;
    }

    if (numEffectfulFns === 0) {
      return null;
    }

    return transferMaps;
  }

  handleTilingType(fn, color, resources, pattern, patternDict, operatorList, task, cacheKey, localTilingPatternCache) {
    const tilingOpList = new _operator_list.OperatorList();

    const patternResources = _primitives.Dict.merge({
      xref: this.xref,
      dictArray: [patternDict.get("Resources"), resources]
    });

    return this.getOperatorList({
      stream: pattern,
      task,
      resources: patternResources,
      operatorList: tilingOpList
    }).then(function () {
      const operatorListIR = tilingOpList.getIR();
      const tilingPatternIR = (0, _pattern.getTilingPatternIR)(operatorListIR, patternDict, color);
      operatorList.addDependencies(tilingOpList.dependencies);
      operatorList.addOp(fn, tilingPatternIR);

      if (cacheKey) {
        localTilingPatternCache.set(cacheKey, patternDict.objId, {
          operatorListIR,
          dict: patternDict
        });
      }
    }).catch(reason => {
      if (reason instanceof _util.AbortException) {
        return;
      }

      if (this.options.ignoreErrors) {
        this.handler.send("UnsupportedFeature", {
          featureId: _util.UNSUPPORTED_FEATURES.errorTilingPattern
        });
        (0, _util.warn)(`handleTilingType - ignoring pattern: "${reason}".`);
        return;
      }

      throw reason;
    });
  }

  handleSetFont(resources, fontArgs, fontRef, operatorList, task, state, fallbackFontDict = null) {
    const fontName = fontArgs && fontArgs[0] instanceof _primitives.Name ? fontArgs[0].name : null;
    return this.loadFont(fontName, fontRef, resources, fallbackFontDict).then(translated => {
      if (!translated.font.isType3Font) {
        return translated;
      }

      return translated.loadType3Data(this, resources, task).then(function () {
        operatorList.addDependencies(translated.type3Dependencies);
        return translated;
      }).catch(reason => {
        this.handler.send("UnsupportedFeature", {
          featureId: _util.UNSUPPORTED_FEATURES.errorFontLoadType3
        });
        return new TranslatedFont({
          loadedName: "g_font_error",
          font: new _fonts.ErrorFont(`Type3 font load error: ${reason}`),
          dict: translated.font,
          extraProperties: this.options.fontExtraProperties
        });
      });
    }).then(translated => {
      state.font = translated.font;
      translated.send(this.handler);
      return translated.loadedName;
    });
  }

  handleText(chars, state) {
    const font = state.font;
    const glyphs = font.charsToGlyphs(chars);

    if (font.data) {
      const isAddToPathSet = !!(state.textRenderingMode & _util.TextRenderingMode.ADD_TO_PATH_FLAG);

      if (isAddToPathSet || state.fillColorSpace.name === "Pattern" || font.disableFontFace || this.options.disableFontFace) {
        PartialEvaluator.buildFontPaths(font, glyphs, this.handler);
      }
    }

    return glyphs;
  }

  ensureStateFont(state) {
    if (state.font) {
      return;
    }

    const reason = new _util.FormatError("Missing setFont (Tf) operator before text rendering operator.");

    if (this.options.ignoreErrors) {
      this.handler.send("UnsupportedFeature", {
        featureId: _util.UNSUPPORTED_FEATURES.errorFontState
      });
      (0, _util.warn)(`ensureStateFont: "${reason}".`);
      return;
    }

    throw reason;
  }

  async setGState({
    resources,
    gState,
    operatorList,
    cacheKey,
    task,
    stateManager,
    localGStateCache,
    localColorSpaceCache
  }) {
    const gStateRef = gState.objId;
    let isSimpleGState = true;
    var gStateObj = [];
    var gStateKeys = gState.getKeys();
    var promise = Promise.resolve();

    for (var i = 0, ii = gStateKeys.length; i < ii; i++) {
      const key = gStateKeys[i];
      const value = gState.get(key);

      switch (key) {
        case "Type":
          break;

        case "LW":
        case "LC":
        case "LJ":
        case "ML":
        case "D":
        case "RI":
        case "FL":
        case "CA":
        case "ca":
          gStateObj.push([key, value]);
          break;

        case "Font":
          isSimpleGState = false;
          promise = promise.then(() => {
            return this.handleSetFont(resources, null, value[0], operatorList, task, stateManager.state).then(function (loadedName) {
              operatorList.addDependency(loadedName);
              gStateObj.push([key, [loadedName, value[1]]]);
            });
          });
          break;

        case "BM":
          gStateObj.push([key, normalizeBlendMode(value)]);
          break;

        case "SMask":
          if ((0, _primitives.isName)(value, "None")) {
            gStateObj.push([key, false]);
            break;
          }

          if ((0, _primitives.isDict)(value)) {
            isSimpleGState = false;
            promise = promise.then(() => {
              return this.handleSMask(value, resources, operatorList, task, stateManager, localColorSpaceCache);
            });
            gStateObj.push([key, true]);
          } else {
            (0, _util.warn)("Unsupported SMask type");
          }

          break;

        case "TR":
          const transferMaps = this.handleTransferFunction(value);
          gStateObj.push([key, transferMaps]);
          break;

        case "OP":
        case "op":
        case "OPM":
        case "BG":
        case "BG2":
        case "UCR":
        case "UCR2":
        case "TR2":
        case "HT":
        case "SM":
        case "SA":
        case "AIS":
        case "TK":
          (0, _util.info)("graphic state operator " + key);
          break;

        default:
          (0, _util.info)("Unknown graphic state operator " + key);
          break;
      }
    }

    return promise.then(function () {
      if (gStateObj.length > 0) {
        operatorList.addOp(_util.OPS.setGState, [gStateObj]);
      }

      if (isSimpleGState) {
        localGStateCache.set(cacheKey, gStateRef, gStateObj);
      }
    });
  }

  loadFont(fontName, font, resources, fallbackFontDict = null) {
    const errorFont = async () => {
      return new TranslatedFont({
        loadedName: "g_font_error",
        font: new _fonts.ErrorFont(`Font "${fontName}" is not available.`),
        dict: font,
        extraProperties: this.options.fontExtraProperties
      });
    };

    var fontRef,
        xref = this.xref;

    if (font) {
      if (!(0, _primitives.isRef)(font)) {
        throw new _util.FormatError('The "font" object should be a reference.');
      }

      fontRef = font;
    } else {
      var fontRes = resources.get("Font");

      if (fontRes) {
        fontRef = fontRes.getRaw(fontName);
      }
    }

    if (!fontRef) {
      const partialMsg = `Font "${fontName || font && font.toString()}" is not available`;

      if (!this.options.ignoreErrors && !this.parsingType3Font) {
        (0, _util.warn)(`${partialMsg}.`);
        return errorFont();
      }

      this.handler.send("UnsupportedFeature", {
        featureId: _util.UNSUPPORTED_FEATURES.errorFontMissing
      });
      (0, _util.warn)(`${partialMsg} -- attempting to fallback to a default font.`);

      if (fallbackFontDict) {
        fontRef = fallbackFontDict;
      } else {
        fontRef = PartialEvaluator.fallbackFontDict;
      }
    }

    if (this.fontCache.has(fontRef)) {
      return this.fontCache.get(fontRef);
    }

    font = xref.fetchIfRef(fontRef);

    if (!(0, _primitives.isDict)(font)) {
      return errorFont();
    }

    if (font.cacheKey && this.fontCache.has(font.cacheKey)) {
      return this.fontCache.get(font.cacheKey);
    }

    var fontCapability = (0, _util.createPromiseCapability)();
    let preEvaluatedFont;

    try {
      preEvaluatedFont = this.preEvaluateFont(font);
    } catch (reason) {
      (0, _util.warn)(`loadFont - preEvaluateFont failed: "${reason}".`);
      return errorFont();
    }

    const {
      descriptor,
      hash
    } = preEvaluatedFont;
    var fontRefIsRef = (0, _primitives.isRef)(fontRef),
        fontID;

    if (fontRefIsRef) {
      fontID = `f${fontRef.toString()}`;
    }

    if (hash && (0, _primitives.isDict)(descriptor)) {
      if (!descriptor.fontAliases) {
        descriptor.fontAliases = Object.create(null);
      }

      var fontAliases = descriptor.fontAliases;

      if (fontAliases[hash]) {
        var aliasFontRef = fontAliases[hash].aliasRef;

        if (fontRefIsRef && aliasFontRef && this.fontCache.has(aliasFontRef)) {
          this.fontCache.putAlias(fontRef, aliasFontRef);
          return this.fontCache.get(fontRef);
        }
      } else {
        fontAliases[hash] = {
          fontID: this.idFactory.createFontId()
        };
      }

      if (fontRefIsRef) {
        fontAliases[hash].aliasRef = fontRef;
      }

      fontID = fontAliases[hash].fontID;
    }

    if (fontRefIsRef) {
      this.fontCache.put(fontRef, fontCapability.promise);
    } else {
      if (!fontID) {
        fontID = this.idFactory.createFontId();
      }

      font.cacheKey = `cacheKey_${fontID}`;
      this.fontCache.put(font.cacheKey, fontCapability.promise);
    }

    (0, _util.assert)(fontID && fontID.startsWith("f"), 'The "fontID" must be (correctly) defined.');
    font.loadedName = `${this.idFactory.getDocId()}_${fontID}`;
    this.translateFont(preEvaluatedFont).then(translatedFont => {
      if (translatedFont.fontType !== undefined) {
        var xrefFontStats = xref.stats.fontTypes;
        xrefFontStats[translatedFont.fontType] = true;
      }

      fontCapability.resolve(new TranslatedFont({
        loadedName: font.loadedName,
        font: translatedFont,
        dict: font,
        extraProperties: this.options.fontExtraProperties
      }));
    }).catch(reason => {
      this.handler.send("UnsupportedFeature", {
        featureId: _util.UNSUPPORTED_FEATURES.errorFontTranslate
      });
      (0, _util.warn)(`loadFont - translateFont failed: "${reason}".`);

      try {
        var fontFile3 = descriptor && descriptor.get("FontFile3");
        var subtype = fontFile3 && fontFile3.get("Subtype");
        var fontType = (0, _fonts.getFontType)(preEvaluatedFont.type, subtype && subtype.name);
        var xrefFontStats = xref.stats.fontTypes;
        xrefFontStats[fontType] = true;
      } catch (ex) {}

      fontCapability.resolve(new TranslatedFont({
        loadedName: font.loadedName,
        font: new _fonts.ErrorFont(reason instanceof Error ? reason.message : reason),
        dict: font,
        extraProperties: this.options.fontExtraProperties
      }));
    });
    return fontCapability.promise;
  }

  buildPath(operatorList, fn, args, parsingText = false) {
    var lastIndex = operatorList.length - 1;

    if (!args) {
      args = [];
    }

    if (lastIndex < 0 || operatorList.fnArray[lastIndex] !== _util.OPS.constructPath) {
      if (parsingText) {
        (0, _util.warn)(`Encountered path operator "${fn}" inside of a text object.`);
        operatorList.addOp(_util.OPS.save, null);
      }

      operatorList.addOp(_util.OPS.constructPath, [[fn], args]);

      if (parsingText) {
        operatorList.addOp(_util.OPS.restore, null);
      }
    } else {
      var opArgs = operatorList.argsArray[lastIndex];
      opArgs[0].push(fn);
      Array.prototype.push.apply(opArgs[1], args);
    }
  }

  parseColorSpace({
    cs,
    resources,
    localColorSpaceCache
  }) {
    return _colorspace.ColorSpace.parseAsync({
      cs,
      xref: this.xref,
      resources,
      pdfFunctionFactory: this._pdfFunctionFactory,
      localColorSpaceCache
    }).catch(reason => {
      if (reason instanceof _util.AbortException) {
        return null;
      }

      if (this.options.ignoreErrors) {
        this.handler.send("UnsupportedFeature", {
          featureId: _util.UNSUPPORTED_FEATURES.errorColorSpace
        });
        (0, _util.warn)(`parseColorSpace - ignoring ColorSpace: "${reason}".`);
        return null;
      }

      throw reason;
    });
  }

  handleColorN(operatorList, fn, args, cs, patterns, resources, task, localColorSpaceCache, localTilingPatternCache) {
    const patternName = args.pop();

    if (patternName instanceof _primitives.Name) {
      const name = patternName.name;
      const localTilingPattern = localTilingPatternCache.getByName(name);

      if (localTilingPattern) {
        try {
          const color = cs.base ? cs.base.getRgb(args, 0) : null;
          const tilingPatternIR = (0, _pattern.getTilingPatternIR)(localTilingPattern.operatorListIR, localTilingPattern.dict, color);
          operatorList.addOp(fn, tilingPatternIR);
          return undefined;
        } catch (ex) {}
      }

      let pattern = patterns.get(name);

      if (pattern) {
        var dict = (0, _primitives.isStream)(pattern) ? pattern.dict : pattern;
        var typeNum = dict.get("PatternType");

        if (typeNum === PatternType.TILING) {
          const color = cs.base ? cs.base.getRgb(args, 0) : null;
          return this.handleTilingType(fn, color, resources, pattern, dict, operatorList, task, name, localTilingPatternCache);
        } else if (typeNum === PatternType.SHADING) {
          var shading = dict.get("Shading");
          var matrix = dict.getArray("Matrix");
          pattern = _pattern.Pattern.parseShading(shading, matrix, this.xref, resources, this.handler, this._pdfFunctionFactory, localColorSpaceCache);
          operatorList.addOp(fn, pattern.getIR());
          return undefined;
        }

        throw new _util.FormatError(`Unknown PatternType: ${typeNum}`);
      }
    }

    throw new _util.FormatError(`Unknown PatternName: ${patternName}`);
  }

  async parseMarkedContentProps(contentProperties, resources) {
    let optionalContent;

    if ((0, _primitives.isName)(contentProperties)) {
      const properties = resources.get("Properties");
      optionalContent = properties.get(contentProperties.name);
    } else if ((0, _primitives.isDict)(contentProperties)) {
      optionalContent = contentProperties;
    } else {
      throw new _util.FormatError("Optional content properties malformed.");
    }

    const optionalContentType = optionalContent.get("Type").name;

    if (optionalContentType === "OCG") {
      return {
        type: optionalContentType,
        id: optionalContent.objId
      };
    } else if (optionalContentType === "OCMD") {
      const optionalContentGroups = optionalContent.get("OCGs");

      if (Array.isArray(optionalContentGroups) || (0, _primitives.isDict)(optionalContentGroups)) {
        const groupIds = [];

        if (Array.isArray(optionalContentGroups)) {
          optionalContent.get("OCGs").forEach(ocg => {
            groupIds.push(ocg.toString());
          });
        } else {
          groupIds.push(optionalContentGroups.objId);
        }

        let expression = null;

        if (optionalContent.get("VE")) {
          expression = true;
        }

        return {
          type: optionalContentType,
          ids: groupIds,
          policy: (0, _primitives.isName)(optionalContent.get("P")) ? optionalContent.get("P").name : null,
          expression
        };
      } else if ((0, _primitives.isRef)(optionalContentGroups)) {
        return {
          type: optionalContentType,
          id: optionalContentGroups.toString()
        };
      }
    }

    return null;
  }

  getOperatorList({
    stream,
    task,
    resources,
    operatorList,
    initialState = null,
    fallbackFontDict = null
  }) {
    resources = resources || _primitives.Dict.empty;
    initialState = initialState || new EvalState();

    if (!operatorList) {
      throw new Error('getOperatorList: missing "operatorList" parameter');
    }

    var self = this;
    var xref = this.xref;
    let parsingText = false;
    const localImageCache = new _image_utils.LocalImageCache();
    const localColorSpaceCache = new _image_utils.LocalColorSpaceCache();
    const localGStateCache = new _image_utils.LocalGStateCache();
    const localTilingPatternCache = new _image_utils.LocalTilingPatternCache();

    var xobjs = resources.get("XObject") || _primitives.Dict.empty;

    var patterns = resources.get("Pattern") || _primitives.Dict.empty;

    var stateManager = new StateManager(initialState);
    var preprocessor = new EvaluatorPreprocessor(stream, xref, stateManager);
    var timeSlotManager = new TimeSlotManager();

    function closePendingRestoreOPS(argument) {
      for (var i = 0, ii = preprocessor.savedStatesDepth; i < ii; i++) {
        operatorList.addOp(_util.OPS.restore, []);
      }
    }

    return new Promise(function promiseBody(resolve, reject) {
      const next = function (promise) {
        Promise.all([promise, operatorList.ready]).then(function () {
          try {
            promiseBody(resolve, reject);
          } catch (ex) {
            reject(ex);
          }
        }, reject);
      };

      task.ensureNotTerminated();
      timeSlotManager.reset();
      var stop,
          operation = {},
          i,
          ii,
          cs,
          name;

      while (!(stop = timeSlotManager.check())) {
        operation.args = null;

        if (!preprocessor.read(operation)) {
          break;
        }

        var args = operation.args;
        var fn = operation.fn;

        switch (fn | 0) {
          case _util.OPS.paintXObject:
            name = args[0].name;

            if (name) {
              const localImage = localImageCache.getByName(name);

              if (localImage) {
                operatorList.addOp(localImage.fn, localImage.args);
                args = null;
                continue;
              }
            }

            next(new Promise(function (resolveXObject, rejectXObject) {
              if (!name) {
                throw new _util.FormatError("XObject must be referred to by name.");
              }

              let xobj = xobjs.getRaw(name);

              if (xobj instanceof _primitives.Ref) {
                const localImage = localImageCache.getByRef(xobj);

                if (localImage) {
                  operatorList.addOp(localImage.fn, localImage.args);
                  resolveXObject();
                  return;
                }

                const globalImage = self.globalImageCache.getData(xobj, self.pageIndex);

                if (globalImage) {
                  operatorList.addDependency(globalImage.objId);
                  operatorList.addOp(globalImage.fn, globalImage.args);
                  resolveXObject();
                  return;
                }

                xobj = xref.fetch(xobj);
              }

              if (!(0, _primitives.isStream)(xobj)) {
                throw new _util.FormatError("XObject should be a stream");
              }

              const type = xobj.dict.get("Subtype");

              if (!(0, _primitives.isName)(type)) {
                throw new _util.FormatError("XObject should have a Name subtype");
              }

              if (type.name === "Form") {
                stateManager.save();
                self.buildFormXObject(resources, xobj, null, operatorList, task, stateManager.state.clone(), localColorSpaceCache).then(function () {
                  stateManager.restore();
                  resolveXObject();
                }, rejectXObject);
                return;
              } else if (type.name === "Image") {
                self.buildPaintImageXObject({
                  resources,
                  image: xobj,
                  operatorList,
                  cacheKey: name,
                  localImageCache,
                  localColorSpaceCache
                }).then(resolveXObject, rejectXObject);
                return;
              } else if (type.name === "PS") {
                (0, _util.info)("Ignored XObject subtype PS");
              } else {
                throw new _util.FormatError(`Unhandled XObject subtype ${type.name}`);
              }

              resolveXObject();
            }).catch(function (reason) {
              if (reason instanceof _util.AbortException) {
                return;
              }

              if (self.options.ignoreErrors) {
                self.handler.send("UnsupportedFeature", {
                  featureId: _util.UNSUPPORTED_FEATURES.errorXObject
                });
                (0, _util.warn)(`getOperatorList - ignoring XObject: "${reason}".`);
                return;
              }

              throw reason;
            }));
            return;

          case _util.OPS.setFont:
            var fontSize = args[1];
            next(self.handleSetFont(resources, args, null, operatorList, task, stateManager.state, fallbackFontDict).then(function (loadedName) {
              operatorList.addDependency(loadedName);
              operatorList.addOp(_util.OPS.setFont, [loadedName, fontSize]);
            }));
            return;

          case _util.OPS.beginText:
            parsingText = true;
            break;

          case _util.OPS.endText:
            parsingText = false;
            break;

          case _util.OPS.endInlineImage:
            var cacheKey = args[0].cacheKey;

            if (cacheKey) {
              const localImage = localImageCache.getByName(cacheKey);

              if (localImage) {
                operatorList.addOp(localImage.fn, localImage.args);
                args = null;
                continue;
              }
            }

            next(self.buildPaintImageXObject({
              resources,
              image: args[0],
              isInline: true,
              operatorList,
              cacheKey,
              localImageCache,
              localColorSpaceCache
            }));
            return;

          case _util.OPS.showText:
            if (!stateManager.state.font) {
              self.ensureStateFont(stateManager.state);
              continue;
            }

            args[0] = self.handleText(args[0], stateManager.state);
            break;

          case _util.OPS.showSpacedText:
            if (!stateManager.state.font) {
              self.ensureStateFont(stateManager.state);
              continue;
            }

            var arr = args[0];
            var combinedGlyphs = [];
            var arrLength = arr.length;
            var state = stateManager.state;

            for (i = 0; i < arrLength; ++i) {
              var arrItem = arr[i];

              if ((0, _util.isString)(arrItem)) {
                Array.prototype.push.apply(combinedGlyphs, self.handleText(arrItem, state));
              } else if ((0, _util.isNum)(arrItem)) {
                combinedGlyphs.push(arrItem);
              }
            }

            args[0] = combinedGlyphs;
            fn = _util.OPS.showText;
            break;

          case _util.OPS.nextLineShowText:
            if (!stateManager.state.font) {
              self.ensureStateFont(stateManager.state);
              continue;
            }

            operatorList.addOp(_util.OPS.nextLine);
            args[0] = self.handleText(args[0], stateManager.state);
            fn = _util.OPS.showText;
            break;

          case _util.OPS.nextLineSetSpacingShowText:
            if (!stateManager.state.font) {
              self.ensureStateFont(stateManager.state);
              continue;
            }

            operatorList.addOp(_util.OPS.nextLine);
            operatorList.addOp(_util.OPS.setWordSpacing, [args.shift()]);
            operatorList.addOp(_util.OPS.setCharSpacing, [args.shift()]);
            args[0] = self.handleText(args[0], stateManager.state);
            fn = _util.OPS.showText;
            break;

          case _util.OPS.setTextRenderingMode:
            stateManager.state.textRenderingMode = args[0];
            break;

          case _util.OPS.setFillColorSpace:
            {
              const cachedColorSpace = _colorspace.ColorSpace.getCached(args[0], xref, localColorSpaceCache);

              if (cachedColorSpace) {
                stateManager.state.fillColorSpace = cachedColorSpace;
                continue;
              }

              next(self.parseColorSpace({
                cs: args[0],
                resources,
                localColorSpaceCache
              }).then(function (colorSpace) {
                if (colorSpace) {
                  stateManager.state.fillColorSpace = colorSpace;
                }
              }));
              return;
            }

          case _util.OPS.setStrokeColorSpace:
            {
              const cachedColorSpace = _colorspace.ColorSpace.getCached(args[0], xref, localColorSpaceCache);

              if (cachedColorSpace) {
                stateManager.state.strokeColorSpace = cachedColorSpace;
                continue;
              }

              next(self.parseColorSpace({
                cs: args[0],
                resources,
                localColorSpaceCache
              }).then(function (colorSpace) {
                if (colorSpace) {
                  stateManager.state.strokeColorSpace = colorSpace;
                }
              }));
              return;
            }

          case _util.OPS.setFillColor:
            cs = stateManager.state.fillColorSpace;
            args = cs.getRgb(args, 0);
            fn = _util.OPS.setFillRGBColor;
            break;

          case _util.OPS.setStrokeColor:
            cs = stateManager.state.strokeColorSpace;
            args = cs.getRgb(args, 0);
            fn = _util.OPS.setStrokeRGBColor;
            break;

          case _util.OPS.setFillGray:
            stateManager.state.fillColorSpace = _colorspace.ColorSpace.singletons.gray;
            args = _colorspace.ColorSpace.singletons.gray.getRgb(args, 0);
            fn = _util.OPS.setFillRGBColor;
            break;

          case _util.OPS.setStrokeGray:
            stateManager.state.strokeColorSpace = _colorspace.ColorSpace.singletons.gray;
            args = _colorspace.ColorSpace.singletons.gray.getRgb(args, 0);
            fn = _util.OPS.setStrokeRGBColor;
            break;

          case _util.OPS.setFillCMYKColor:
            stateManager.state.fillColorSpace = _colorspace.ColorSpace.singletons.cmyk;
            args = _colorspace.ColorSpace.singletons.cmyk.getRgb(args, 0);
            fn = _util.OPS.setFillRGBColor;
            break;

          case _util.OPS.setStrokeCMYKColor:
            stateManager.state.strokeColorSpace = _colorspace.ColorSpace.singletons.cmyk;
            args = _colorspace.ColorSpace.singletons.cmyk.getRgb(args, 0);
            fn = _util.OPS.setStrokeRGBColor;
            break;

          case _util.OPS.setFillRGBColor:
            stateManager.state.fillColorSpace = _colorspace.ColorSpace.singletons.rgb;
            args = _colorspace.ColorSpace.singletons.rgb.getRgb(args, 0);
            break;

          case _util.OPS.setStrokeRGBColor:
            stateManager.state.strokeColorSpace = _colorspace.ColorSpace.singletons.rgb;
            args = _colorspace.ColorSpace.singletons.rgb.getRgb(args, 0);
            break;

          case _util.OPS.setFillColorN:
            cs = stateManager.state.fillColorSpace;

            if (cs.name === "Pattern") {
              next(self.handleColorN(operatorList, _util.OPS.setFillColorN, args, cs, patterns, resources, task, localColorSpaceCache, localTilingPatternCache));
              return;
            }

            args = cs.getRgb(args, 0);
            fn = _util.OPS.setFillRGBColor;
            break;

          case _util.OPS.setStrokeColorN:
            cs = stateManager.state.strokeColorSpace;

            if (cs.name === "Pattern") {
              next(self.handleColorN(operatorList, _util.OPS.setStrokeColorN, args, cs, patterns, resources, task, localColorSpaceCache, localTilingPatternCache));
              return;
            }

            args = cs.getRgb(args, 0);
            fn = _util.OPS.setStrokeRGBColor;
            break;

          case _util.OPS.shadingFill:
            var shadingRes = resources.get("Shading");

            if (!shadingRes) {
              throw new _util.FormatError("No shading resource found");
            }

            var shading = shadingRes.get(args[0].name);

            if (!shading) {
              throw new _util.FormatError("No shading object found");
            }

            var shadingFill = _pattern.Pattern.parseShading(shading, null, xref, resources, self.handler, self._pdfFunctionFactory, localColorSpaceCache);

            var patternIR = shadingFill.getIR();
            args = [patternIR];
            fn = _util.OPS.shadingFill;
            break;

          case _util.OPS.setGState:
            name = args[0].name;

            if (name) {
              const localGStateObj = localGStateCache.getByName(name);

              if (localGStateObj) {
                if (localGStateObj.length > 0) {
                  operatorList.addOp(_util.OPS.setGState, [localGStateObj]);
                }

                args = null;
                continue;
              }
            }

            next(new Promise(function (resolveGState, rejectGState) {
              if (!name) {
                throw new _util.FormatError("GState must be referred to by name.");
              }

              const extGState = resources.get("ExtGState");

              if (!(extGState instanceof _primitives.Dict)) {
                throw new _util.FormatError("ExtGState should be a dictionary.");
              }

              const gState = extGState.get(name);

              if (!(gState instanceof _primitives.Dict)) {
                throw new _util.FormatError("GState should be a dictionary.");
              }

              self.setGState({
                resources,
                gState,
                operatorList,
                cacheKey: name,
                task,
                stateManager,
                localGStateCache,
                localColorSpaceCache
              }).then(resolveGState, rejectGState);
            }).catch(function (reason) {
              if (reason instanceof _util.AbortException) {
                return;
              }

              if (self.options.ignoreErrors) {
                self.handler.send("UnsupportedFeature", {
                  featureId: _util.UNSUPPORTED_FEATURES.errorExtGState
                });
                (0, _util.warn)(`getOperatorList - ignoring ExtGState: "${reason}".`);
                return;
              }

              throw reason;
            }));
            return;

          case _util.OPS.moveTo:
          case _util.OPS.lineTo:
          case _util.OPS.curveTo:
          case _util.OPS.curveTo2:
          case _util.OPS.curveTo3:
          case _util.OPS.closePath:
          case _util.OPS.rectangle:
            self.buildPath(operatorList, fn, args, parsingText);
            continue;

          case _util.OPS.markPoint:
          case _util.OPS.markPointProps:
          case _util.OPS.beginCompat:
          case _util.OPS.endCompat:
            continue;

          case _util.OPS.beginMarkedContentProps:
            if (!(0, _primitives.isName)(args[0])) {
              (0, _util.warn)(`Expected name for beginMarkedContentProps arg0=${args[0]}`);
              continue;
            }

            if (args[0].name === "OC") {
              next(self.parseMarkedContentProps(args[1], resources).then(data => {
                operatorList.addOp(_util.OPS.beginMarkedContentProps, ["OC", data]);
              }).catch(reason => {
                if (reason instanceof _util.AbortException) {
                  return;
                }

                if (self.options.ignoreErrors) {
                  self.handler.send("UnsupportedFeature", {
                    featureId: _util.UNSUPPORTED_FEATURES.errorMarkedContent
                  });
                  (0, _util.warn)(`getOperatorList - ignoring beginMarkedContentProps: "${reason}".`);
                  return;
                }

                throw reason;
              }));
              return;
            }

            args = [args[0].name];
            break;

          case _util.OPS.beginMarkedContent:
          case _util.OPS.endMarkedContent:
          default:
            if (args !== null) {
              for (i = 0, ii = args.length; i < ii; i++) {
                if (args[i] instanceof _primitives.Dict) {
                  break;
                }
              }

              if (i < ii) {
                (0, _util.warn)("getOperatorList - ignoring operator: " + fn);
                continue;
              }
            }

        }

        operatorList.addOp(fn, args);
      }

      if (stop) {
        next(deferred);
        return;
      }

      closePendingRestoreOPS();
      resolve();
    }).catch(reason => {
      if (reason insta