@syncfusion/ej2-pdf/src/pdf/core/compression/pdf-fax-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 { _PdfDecodeStream } from '../decode-stream';
import { _PdfFaxDecoder } from '../graphics/images/pdf-fax-decoder';
import { _PdfDictionary } from '../pdf-primitives';
/**
 * Provides a CCITT Fax decoding stream that expands fax encoded data from the underlying source.
 *
 * @private
 */
var _PdfFaxStream = /** @class */ (function (_super) {
    __extends(_PdfFaxStream, _super);
    function _PdfFaxStream(str, maybeLength, params) {
        var _this = _super.call(this, maybeLength) || this;
        _this.stream = str;
        if (!(params instanceof _PdfDictionary)) {
            params = new _PdfDictionary(null);
        }
        var source = {
            next: function () {
                return str.getByte();
            }
        };
        _this.ccittFaxDecoder = new _PdfFaxDecoder(source, {
            K: params.get('K'),
            EndOfLine: params.get('EndOfLine'),
            EncodedByteAlign: params.get('EncodedByteAlign'),
            Columns: params.get('Columns'),
            Rows: params.get('Rows'),
            EndOfBlock: params.get('EndOfBlock'),
            BlackIs1: params.get('BlackIs1')
        });
        return _this;
    }
    _PdfFaxStream.prototype.readBlock = function () {
        while (!this.eof) {
            var c = this.ccittFaxDecoder.readNextChar();
            if (c === -1) {
                this.eof = true;
                return;
            }
            this.ensureBuffer(this.bufferLength + 1);
            this.buffer[this.bufferLength++] = c;
        }
    };
    return _PdfFaxStream;
}(_PdfDecodeStream));
export { _PdfFaxStream };