pdfjs-dist/lib/core/file_spec.js

/**
 * @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.FileSpec = void 0;

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

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

function pickPlatformItem(dict) {
  if (dict.has("UF")) {
    return dict.get("UF");
  } else if (dict.has("F")) {
    return dict.get("F");
  } else if (dict.has("Unix")) {
    return dict.get("Unix");
  } else if (dict.has("Mac")) {
    return dict.get("Mac");
  } else if (dict.has("DOS")) {
    return dict.get("DOS");
  }

  return null;
}

class FileSpec {
  constructor(root, xref) {
    if (!root || !(0, _primitives.isDict)(root)) {
      return;
    }

    this.xref = xref;
    this.root = root;

    if (root.has("FS")) {
      this.fs = root.get("FS");
    }

    this.description = root.has("Desc") ? (0, _util.stringToPDFString)(root.get("Desc")) : "";

    if (root.has("RF")) {
      (0, _util.warn)("Related file specifications are not supported");
    }

    this.contentAvailable = true;

    if (!root.has("EF")) {
      this.contentAvailable = false;
      (0, _util.warn)("Non-embedded file specifications are not supported");
    }
  }

  get filename() {
    if (!this._filename && this.root) {
      const filename = pickPlatformItem(this.root) || "unnamed";
      this._filename = (0, _util.stringToPDFString)(filename).replace(/\\\\/g, "\\").replace(/\\\//g, "/").replace(/\\/g, "/");
    }

    return this._filename;
  }

  get content() {
    if (!this.contentAvailable) {
      return null;
    }

    if (!this.contentRef && this.root) {
      this.contentRef = pickPlatformItem(this.root.get("EF"));
    }

    let content = null;

    if (this.contentRef) {
      const fileObj = this.xref.fetchIfRef(this.contentRef);

      if (fileObj && (0, _primitives.isStream)(fileObj)) {
        content = fileObj.getBytes();
      } else {
        (0, _util.warn)("Embedded file specification points to non-existing/invalid content");
      }
    } else {
      (0, _util.warn)("Embedded file specification does not have a content");
    }

    return content;
  }

  get serializable() {
    return {
      filename: this.filename,
      content: this.content
    };
  }

}

exports.FileSpec = FileSpec;