protected virtual IPDFToken ProcessKeyword(PDFKeyword token)
{
switch (token.Name)
{
case "true": return(new PDFBoolean {
Value = true
});
case "false": return(new PDFBoolean {
Value = false
});
case "null": return(new PDFNull());
case "obj": return(new PDFToken(PDFTokenType.StartObject));
case "xref": return(new PDFToken(PDFTokenType.Xref));
case "startxref": return(new PDFToken(PDFTokenType.StartXref));
case "endobj": return(PDFObject.Parse(this));
case "trailer": return(PDFXref.Parse(this));
case "n": return(PDFXrefEntry.Parse(this, PDFTokenType.XrefEntryInUse));
case "f": return(PDFXrefEntry.Parse(this, PDFTokenType.XrefEntryFree));
case "R": return(PDFObjRef.Parse(this));
default: throw new InvalidDataException(String.Format("Unknown keyword '{0}'", token.Name));
}
}
public static PDFXrefEntry Parse(Stack <IPDFToken> tokens, PDFTokenType type)
{
PDFXrefEntry entry = new PDFXrefEntry();
entry.InUse = type == PDFTokenType.XrefEntryInUse;
entry.Generation = (int)tokens.Pop <PDFInteger>().Value;
entry.Offset = (long)tokens.Pop <PDFInteger>().Value;
return(entry);
}
public static PDFXref Parse(Stack <IPDFToken> tokens)
{
PDFXref xref = new PDFXref {
Entries = new List <PDFXrefEntry>()
};
while (tokens.Count != 0 && (tokens.Peek().TokenType == PDFTokenType.XrefEntry || tokens.Peek().TokenType == PDFTokenType.Integer))
{
Stack <PDFXrefEntry> entries = new Stack <PDFXrefEntry>();
PDFXrefEntry entry = null;
while (tokens.TryPop <PDFXrefEntry>(out entry))
{
entries.Push(entry);
}
int count = (int)tokens.Pop <PDFInteger>().Value;
int start = (int)tokens.Pop <PDFInteger>().Value;
while (entries.Count != 0)
{
PDFXrefEntry ent = entries.Pop();
ent.ID = start++;
xref.Entries.Add(ent);
}
IPDFToken token;
if (tokens.TryPop(PDFTokenType.Xref, out token))
{
return(xref);
}
}
throw new InvalidDataException();
}