public List <TokenXRefEntry> IndirectObjectsToXRef()
{
List <TokenXRefEntry> entries = new List <TokenXRefEntry>();
// Start scanning from beginning of the source
Tokenizer.IgnoreComments = false;
Tokenizer.Position = 0;
long lastTrailer = -1;
do
{
long t1Position = Tokenizer.Position;
TokenObject t1 = Tokenizer.GetToken();
if (t1 is TokenInteger)
{
TokenInteger t2 = Tokenizer.GetToken() as TokenInteger;
if (t2 != null)
{
TokenKeyword t3 = Tokenizer.GetToken() as TokenKeyword;
if ((t3 != null) && (t3.Value == ParseKeyword.Obj))
{
TokenInteger id = (TokenInteger)t1;
entries.Add(new TokenXRefEntry(id.Value, t2.Value, t1Position, true));
}
}
}
else if ((t1 is TokenKeyword) && ((TokenKeyword)t1).Value == ParseKeyword.Trailer)
{
lastTrailer = t1Position;
}
} while (Tokenizer.GotoNextLine());
// Leave with the position on the last 'trailer' as caller will then parse it
if (lastTrailer >= 0)
{
Tokenizer.Position = lastTrailer;
}
return(entries);
}
public void ParseXRefSections(List <TokenXRefEntry> entries)
{
while (true)
{
TokenObject t = Tokenizer.GetToken();
ThrowOnError(t);
// Cross-reference table ends when we find a 'trailer' keyword instead of another section
if ((t is TokenKeyword) && (((TokenKeyword)t).Value == ParseKeyword.Trailer))
{
Tokenizer.PushToken(t);
return;
}
// Section starts with an integer object number
TokenInteger start = t as TokenInteger;
if (start == null)
{
throw new ApplicationException($"Cross-reference section number must be an integer.");
}
t = Tokenizer.GetToken();
ThrowOnError(t);
// Section then has an integer length number
TokenInteger length = t as TokenInteger;
if (length == null)
{
throw new ApplicationException($"Cross-reference section length must be an integer.");
}
// Load each line in the section
for (int i = 0, id = start.Value; i < length.Value; i++, id++)
{
TokenObject entry = Tokenizer.GetXRefEntry(id);
ThrowOnError(entry);
entries.Add((TokenXRefEntry)entry);
}
}
}
public ParseInteger(TokenInteger token)
{
Value = token.Value;
}
public ParseIndirectObject(TokenInteger id, TokenInteger gen, ParseObjectBase obj)
{
Id = id.Value;
Gen = gen.Value;
Object = obj;
}
public ParseObjectReference(TokenInteger id, TokenInteger gen)
{
Id = id.Value;
Gen = gen.Value;
}