Document Processing

Provide a way for users to check whether a stream is a valid zip archive. Include a CRC check as well.

Current implementation relies on valid cross-reference offsets in the PDF documents so that PDF objects are easily found and parsed. However, we may implement a mechanism for repairing documents with invalid cross-reference tables.

Excel provides an option to choose whether cells with number cell value zero should display as "0" or as if they are empty. The option can be found in File -> Options -> Advanced -> "Show a zero in cells that have zero value". The option is set per sheet. The XML attribute is called "zeroValues" and it can be found on page 1625 in the format specification.

Add support for ToUnicode CMap stream.

A side effect of not supporting it is the following: exporting PDF document which, for example, contains German umlauts, to plain text, leads to wrong characters in the resulting text.

As possible workaround the PdfFormatProvider instance of RadPdfViewer can be used to import the document. For example:

FormatProviderSettings settings = new FormatProviderSettings(ReadingMode.OnDemand);
PdfFormatProvider pdfViewerFormatProvider = new PdfFormatProvider(stream, settings);

RadFixedDocument document = pdfViewerFormatProvider.Import();

TextFormatProvider textFormatProvider = new TextFormatProvider();
String text = textFormatProvider.Export(document);

The FunctionType property is required according to PDF specification and we should always export it.

Fix available in R2 2018 SP1 release version.