/// <summary>
/// Reads next <see cref="PdfObject"/> from PDF stream.
/// </summary>
/// <param name="reader">The <see cref="PdfReader"/> to use.</param>
/// <returns>Read PdfObject.</returns>
public static PdfObject ReadObject(this PdfReader reader)
{
if (reader == null)
{
throw new ArgumentNullException(nameof(reader));
}
reader.MoveToNonWhiteSpace();
char firstChar = reader.Peek();
switch (firstChar)
{
case '%':
// Skip comment
reader.SkipWhile(c => !Chars.IsEndOfLine(c));
reader.SkipWhile(Chars.IsEndOfLine);
// Then try read next object
return(ReadObject(reader));
case 't':
reader.ReadToken(BooleanObject.TrueToken);
return(new BooleanObject(true, true));
case 'f':
reader.ReadToken(BooleanObject.FalseToken);
return(new BooleanObject(false, true));
case 'n':
reader.ReadToken(NullObject.NullToken);
return(new NullObject());
case '(':
return(LiteralStringObject.FromReader(reader));
case '<':
if (reader.Peek(1) == '<')
{
return(DictionaryObject.FromReader(reader));
}
else
{
return(HexadecimalStringObject.FromReader(reader));
}
case '/':
return(NameObject.FromReader(reader));
case '[':
return(ArrayObject.FromReader(reader));
case '+':
case '-':
return(NumericObject.FromReader(reader));
}
if (char.IsDigit(firstChar))
{
int indRefLength = IsIndirectReference(reader);
if (indRefLength >= 5)
{
var indRefStr = reader.ReadString(indRefLength);
var objectId = PdfObjectId.FromString(indRefStr.Substring(0, indRefLength - 2));
return(new IndirectReference(objectId));
}
return(NumericObject.FromReader(reader));
}
throw new NotImplementedException();
}