@syncfusion/ej2-pdf/src/pdf/core/compression/jbig2-stream.js

Feature-rich JavaScript PDF library with built-in support for loading and manipulating PDF document.

var __extends = (this && this.__extends) || (function () {
    var extendStatics = function (d, b) {
        extendStatics = Object.setPrototypeOf ||
            ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
            function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
        return extendStatics(d, b);
    };
    return function (d, b) {
        extendStatics(d, b);
        function __() { this.constructor = d; }
        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
    };
})();
import { _PdfBaseStream } from '../base-stream';
import { _PdfDecodeStream } from '../decode-stream';
import { _PdfJbig2Image } from '../graphics/images/jbig2-image';
import { _PdfDictionary } from '../pdf-primitives';
/**
 * Provides a JBIG2 decoding stream that reads from a base stream and outputs inverted bitmap data.
 *
 * @private
 */
var _PdfJbig2Stream = /** @class */ (function (_super) {
    __extends(_PdfJbig2Stream, _super);
    function _PdfJbig2Stream(stream, maybeLength, params) {
        var _this = _super.call(this, maybeLength) || this;
        _this.stream = stream;
        _this.maybeLength = maybeLength;
        _this.params = params;
        return _this;
    }
    Object.defineProperty(_PdfJbig2Stream.prototype, "bytes", {
        get: function () {
            return this.stream.getBytes(this.maybeLength);
        },
        enumerable: true,
        configurable: true
    });
    _PdfJbig2Stream.prototype.readBlock = function () {
        this.decodeImage();
    };
    _PdfJbig2Stream.prototype.decodeImage = function (bytes) {
        if (this.eof) {
            return this.buffer;
        }
        bytes = bytes || this.bytes;
        var jbig2Image = new _PdfJbig2Image();
        var chunks = []; // eslint-disable-line
        if (this.params instanceof _PdfDictionary) {
            var globalsStream = this.params.get('JBIG2Globals'); // eslint-disable-line
            if (globalsStream instanceof _PdfBaseStream) {
                var globals = globalsStream.getBytes(); // eslint-disable-line
                chunks.push({ data: globals, start: 0, end: globals.length });
            }
        }
        chunks.push({ data: bytes, start: 0, end: bytes.length });
        var data = jbig2Image._parseChunks(chunks); // eslint-disable-line
        var dataLength = data.length;
        for (var i = 0; i < dataLength; i++) {
            data[i] ^= 0xff;
        }
        this.buffer = data;
        this.bufferLength = dataLength;
        this.eof = true;
        return this.buffer;
    };
    return _PdfJbig2Stream;
}(_PdfDecodeStream));
export { _PdfJbig2Stream };