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Avoid "Non-negative number required" Exception #110

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Avoid "Non-negative number required" Exception #110

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12 changes: 6 additions & 6 deletions src/PdfSharp/Pdf.IO/Parser.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -189,8 +189,8 @@ public PdfObject ReadObject(PdfObject pdfObject, PdfObjectID objectID, bool incl
break;

// Acrobat 6 Professional proudly presents: The Null object!
// Even with a one-digit object number an indirect reference �x 0 R� to this object is
// one character larger than the direct use of �null�. Probable this is the reason why
// Even with a one-digit object number an indirect reference «x 0 R» to this object is
// one character larger than the direct use of «null». Probable this is the reason why
// it is true that Acrobat Web Capture 6.0 creates this object, but obviously never
// creates a reference to it!
case Symbol.Null:
Expand Down Expand Up @@ -1025,10 +1025,10 @@ internal PdfTrailer ReadTrailer()
// If "startxref" was still not found yet, read the file completely.
string trail = _lexer.ReadRawString(0, length);
idx = trail.LastIndexOf("startxref", StringComparison.Ordinal);
if (idx == -1)
throw new Exception("The StartXRef table could not be found, the file cannot be opened.");
_lexer.Position = idx;
}
if (idx == -1)
throw new Exception("The StartXRef table could not be found, the file cannot be opened.");

ReadSymbol(Symbol.StartXRef);
_lexer.Position = ReadInteger();
Expand Down Expand Up @@ -1237,7 +1237,7 @@ private PdfTrailer ReadXRefStream(PdfCrossReferenceTable xrefTable)
int prev = xrefStream.Elements.GetInteger(PdfCrossReferenceStream.Keys.Prev);
PdfArray w = (PdfArray)xrefStream.Elements.GetValue(PdfCrossReferenceStream.Keys.W);

// E.g.: W[1 2 1] � Index[7 12] � Size 19
// E.g.: W[1 2 1] ¤ Index[7 12] ¤ Size 19

// Setup subsections.
int subsectionCount;
Expand Down Expand Up @@ -1815,4 +1815,4 @@ public static uint ReadBytes(byte[] bytes, int index, int byteCount)
return value;
}
}
}
}