Unable to parse pdf due to font issue

[romanimm]

I've stumbled upon this pdf, which throws an InvalidFontFormatException up on calling document.GetPages() or GetPage(x).

UglyToad.PdfPig.Fonts.InvalidFontFormatException
No font descriptor indirect reference found in the TrueType font: <BaseFont, /ZAYDXJ+YogaSansforLUKB-Light>, <Encoding, /WinAnsiEncoding>, <FirstChar, 32>, <FontDescriptor, 3170 0>, <LastChar, 150>, <Subtype, /TrueType>, <ToUnicode, 168 0>, <Type, /Font>, <Widths, [ 230, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 234, 0, 500, 500, 500, 500, 0, 0, 500, 500, 0, 500, 0, 0, 0, 0, 0, 0, 0, 631, 544, 0, 679, 0, 518, 0, 0, 0, 275, 0, 0, 0, 0, 0, 0, 0, 0, 476, 0, 674, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 429, 0, 0, 0, 464, 0, 0, 532, 238, 0, 477, 0, 780, 0, 525, 0, 0, 351, 387, 332, 518, 0, 0, 0, 0, 434, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 450 ]>.
   at UglyToad.PdfPig.PdfFonts.Parser.FontDictionaryAccessHelper.GetFontDescriptor(IPdfTokenScanner pdfScanner, DictionaryToken dictionary)
   at UglyToad.PdfPig.PdfFonts.Parser.Handlers.TrueTypeFontHandler.Generate(DictionaryToken dictionary)
   at UglyToad.PdfPig.PdfFonts.FontFactory.Get(DictionaryToken dictionary)
   at UglyToad.PdfPig.Content.ResourceStore.LoadFontDictionary(DictionaryToken fontDictionary)
   at UglyToad.PdfPig.Content.ResourceStore.LoadResourceDictionary(DictionaryToken resourceDictionary)
   at UglyToad.PdfPig.Content.BasePageFactory`1.Create(Int32 number, DictionaryToken dictionary, PageTreeMembers pageTreeMembers, NamedDestinations namedDestinations)
   at UglyToad.PdfPig.Content.Pages.GetPage[TPage](IPageFactory`1 pageFactory, Int32 pageNumber, NamedDestinations namedDestinations, ParsingOptions parsingOptions)
   at UglyToad.PdfPig.Content.Pages.GetPage(Int32 pageNumber, NamedDestinations namedDestinations, ParsingOptions parsingOptions)
   at UglyToad.PdfPig.PdfDocument.GetPage(Int32 pageNumber)
   at UglyToad.PdfPig.PdfDocument.GetPages()+MoveNext()

I've tried with different ParsingOptions:

• SkipMissingFonts = true gives a null pointer exception
• UseLenientParsing = true has no effect

Log:

Debug Found the first cross reference table or stream at 2079366.
Debug Reading cross reference table or stream at 2079366.
Debug Element was cross reference table.
Debug Reading cross reference table or stream at 1971977.
Debug Element was cross reference table.
Debug Reading cross reference table or stream at 1966160.
Debug Element was cross reference table.
Debug Reading cross reference table or stream at 116.
Debug Element was cross reference table.
Debug Cross reference table contained reference to stream. Reading the stream.
Debug Reading cross reference table or stream at 1887879.
Debug Element was cross reference table.
Debug Accessing page 1.

Tested with 0.1.8 and 0.1.9-alpha-20240419-1ef2e on windows an linux (alpine).

[mahmoodali31]

I am getting the same error as [romanimm] plus null reference exception and Invalid ColorSpace token encountered. Would you please investigate and push a fix?

No font descriptor indirect reference found in the TrueType font: <BaseFont, /KVGATS+GNElliot-Bold>, <Encoding, /WinAnsiEncoding>, <FirstChar, 32>, <FontDescriptor, 48 0>, <LastChar, 117>, <Subtype, /Type1>, <ToUnicode, 71 0>, <Type, /Font>, <Widths, [ 240, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 265, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 681, 0, 0, 0, 0, 0, 0, 777, 302, 0, 0, 0, 865, 777, 777, 0, 0, 660, 588, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 551, 0, 0, 601, 551, 383, 601, 601, 259, 0, 0, 0, 0, 601, 601, 0, 0, 401, 463, 415, 601 ]>.
[08/23/2024 16:50:29 > d0b8e7: INFO] at UglyToad.PdfPig.PdfFonts.Parser.FontDictionaryAccessHelper.GetFontDescriptor(IPdfTokenScanner pdfScanner, DictionaryToken dictionary)

Invalid ColorSpace token encountered in page resource dictionary: 655 0.
[08/23/2024 16:39:56 > d0b8e7: INFO] at UglyToad.PdfPig.Content.ResourceStore.LoadResourceDictionary(DictionaryToken resourceDictionary, InternalParsingOptions parsingOptions)
[08/23/2024 16:39:56 > d0b8e7: INFO] at UglyToad.PdfPig.Graphics.ContentStreamProcessor.ProcessFormXObject(StreamToken formStream)
[08/23/2024 16:39:56 > d0b8e7: INFO] at UglyToad.PdfPig.Graphics.ContentStreamProcessor.ApplyXObject(NameToken xObjectName)
[08/23/2024 16:39:56 > d0b8e7: INFO] at UglyToad.PdfPig.Graphics.Operations.InvokeNamedXObject.Run(IOperationContext operationContext)
[08/23/2024 16:39:56 > d0b8e7: INFO] at UglyToad.PdfPig.Graphics.ContentStreamProcessor.ProcessOperations(IReadOnlyList1 operations) [08/23/2024 16:39:56 > d0b8e7: INFO] at UglyToad.PdfPig.Graphics.ContentStreamProcessor.Process(Int32 pageNumberCurrent, IReadOnlyList1 operations)
[08/23/2024 16:39:56 > d0b8e7: INFO] at UglyToad.PdfPig.Parser.PageFactory.GetContent(Int32 pageNumber, IReadOnlyList`1 contentBytes, CropBox cropBox, UserSpaceUnit userSpaceUnit, PageRotationDegrees rotation, MediaBox mediaBox, InternalParsingOptions parsingOptions)
[08/23/2024 16:39:56 > d0b8e7: INFO] at UglyToad.PdfPig.Parser.PageFactory.Create(Int32 number, DictionaryToken dictionary, PageTreeMembers pageTreeMembers, NamedDestinations namedDestinations, InternalParsingOptions parsingOptions)
[08/23/2024 16:39:56 > d0b8e7: INFO] at UglyToad.PdfPig.Content.Pages.GetPage(Int32 pageNumber, NamedDestinations namedDestinations, InternalParsingOptions parsingOptions)
[08/23/2024 16:39:56 > d0b8e7: INFO] at UglyToad.PdfPig.PdfDocument.GetPage(Int32 pageNumber)
[08/23/2024 16:39:56 > d0b8e7: INFO] at UglyToad.PdfPig.PdfDocument.GetPages()+MoveNext()

[BobLd]

@mahmoodali31 can you share the problematic pdf file?

[mahmoodali31]

@BobLd I cannot share the PDF as it is confidential. I am using a PDF stream to extract content. I double-checked the PDF. It contains an image and text at the bottom.

StringBuilder sb = new();
using var document = UglyToad.PdfPig.PdfDocument.Open(stream, new UglyToad.PdfPig.ParsingOptions() { UseLenientParsing = true, SkipMissingFonts = true });
int count = document.NumberOfPages;
for (int i = 1; i <= count; i++)
{
var page = document.GetPage(i);
var letters = page.Letters;

  var wordExtractor = NearestNeighbourWordExtractor.Instance;

  var words = wordExtractor.GetWords(letters);

  sb.AppendLine(string.Join(" ", words.Select(w => w.Text)));

}
return sb.ToString();