@syncfusion/ej2-pdf
Version:
Feature-rich JavaScript PDF library with built-in support for loading and manipulating PDF document.
57 lines (56 loc) • 2.17 kB
JavaScript
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';
/**
* Provides a RunLength decoding stream that expands run length encoded data from the underlying stream.
*
* @private
*/
var _PdfRunLengthStream = /** @class */ (function (_super) {
__extends(_PdfRunLengthStream, _super);
function _PdfRunLengthStream(str, maybeLength) {
var _this = _super.call(this, maybeLength) || this;
_this.stream = str;
_this.dict = str.dict;
return _this;
}
_PdfRunLengthStream.prototype.readBlock = function () {
var repeatHeader = this.stream.getBytes(2); // eslint-disable-line
if (!repeatHeader || repeatHeader.length < 2 || repeatHeader[0] === 128) {
this.eof = true;
return;
}
var buffer; // eslint-disable-line
var bufferLength = this.bufferLength;
var n = repeatHeader[0];
if (n < 128) {
buffer = this.ensureBuffer(bufferLength + n + 1);
buffer[bufferLength++] = repeatHeader[1];
if (n > 0) {
var source = this.stream.getBytes(n); // eslint-disable-line
buffer.set(source, bufferLength);
bufferLength += n;
}
}
else {
n = 257 - n;
buffer = this.ensureBuffer(bufferLength + n + 1);
buffer.fill(repeatHeader[1], bufferLength, bufferLength + n);
bufferLength += n;
}
this.bufferLength = bufferLength;
};
return _PdfRunLengthStream;
}(_PdfDecodeStream));
export { _PdfRunLengthStream };