internal static DocumentFont GetFont(PDFObjects pdf, PdfObject pdfObject)
{
var dic = pdf.GetObject <DictionaryObject>(pdfObject);
var name = pdf.GetObject <NameObject>(dic.Dictionary["BaseFont"]).Value;
lock (lck) {
if (m_lstFont.ContainsKey(name))
{
return(m_lstFont[name]);
}
if (IsBaseFont(pdf, dic))
{
var font = new DocumentBaseFont(name);
m_lstFont.Add(name, font);
return(font);
}
else if (IsSubsetFont(dic))
{
var font = pdf.GetDocument <DocumentTtfSubsetFont>(pdfObject);
m_lstFont.Add(name, font);
return(font);
}
else if (IsTrueTypeFont(pdf, dic))
{
var font = pdf.GetDocument <DocumentTtfFont>(pdfObject);
m_lstFont.Add(name, font);
return(font);
}
}
throw new PdfException(PdfExceptionCodes.INVALID_FONT, $"Not supported font type");
}
private DocumentCatalog ReadXRef(Tokenizer tokenizer)
{
long xrefPosition = XrefPosition(tokenizer);
tokenizer.MoveToPosition(xrefPosition);
Token token = tokenizer.Token();
if (!TokenValidator.Validate(token, CharacterSetType.Regular, "xref"))
{
throw new PdfException(PdfExceptionCodes.INVALID_XREF, "Expected xref");
}
token = tokenizer.Token();
if (!TokenValidator.IsWhiteSpace(token))
{
throw new PdfException(PdfExceptionCodes.INVALID_XREF, "after xref must be a whitspace");
}
tokenizer.GetInteger(); // objectNumber
tokenizer.TokenExcludedComments();
int numberOfEntries = tokenizer.GetInteger();
tokenizer.TokenExcludedComments();
PDFObjects pdfObjects = new PDFObjects();
for (int i = 0; i < numberOfEntries; i++)
{
int pos = tokenizer.GetInteger(); // position
tokenizer.TokenExcludedComments(); // whitespace
tokenizer.GetInteger(); // generation
tokenizer.TokenExcludedComments(); // whitespace
string type = tokenizer.Token().ToString(); // f or n
tokenizer.TokenExcludedComments(); // whitespace
if (type != "f" && type != "n")
{
throw new PdfException(PdfExceptionCodes.INVALID_XREF, "only xref f or n entries allowed");
}
if (type == "f") // free element
{
continue;
}
tokenizer.SavePosition();
tokenizer.MoveToPosition(pos);
IndirectObject obj = new IndirectObject(tokenizer);
pdfObjects.AddObject(obj);
tokenizer.RestorePosition();
}
if (tokenizer.Token().ToString() != "trailer")
{
throw new PdfException(PdfExceptionCodes.INVALID_TRAILER, "expected trailer");
}
var trailer = new DictionaryObject(tokenizer);
var rootIndirect = (IndirectReferenceObject)trailer.Dictionary["Root"];
return(pdfObjects.GetDocument <DocumentCatalog>(rootIndirect));
}