/// <summary>
/// Attempt to parse a sequence of bytes as a PDF object
/// </summary>
/// <param name="Data">Bytes to parse</param>
/// <param name="EndingIndex">0-based index into data indicating the byte after the last parsed byte</param>
/// <param name="StartingIndex">0-based index into data at which to start parsing (default: 0)</param>
/// <returns>PDF object successfully parsed from the data, or NULL if no complete object was parsable</returns>
public static IPDFObject Parse(byte[] Data, out int EndingIndex, int StartingIndex = 0)
{
int StartTokenIndex;
int EndTokenIndex;
IPDFObject ParsedObject = null;
string Token = GetTokenString(Data, StartingIndex, out StartTokenIndex, out EndTokenIndex);
if (!string.IsNullOrEmpty(Token))
{
if ((ParsedObject = PDFDictionary.TryParse(Token, Data, StartTokenIndex, out EndingIndex)) != null)
{
return(ParsedObject);
}
if ((ParsedObject = PDFArray.TryParse(Token, Data, StartTokenIndex, out EndingIndex)) != null)
{
return(ParsedObject);
}
if ((ParsedObject = PDFString.TryParse(Token, Data, StartTokenIndex, out EndingIndex)) != null)
{
return(ParsedObject);
}
if ((ParsedObject = PDFHexString.TryParse(Token, Data, StartTokenIndex, out EndingIndex)) != null)
{
return(ParsedObject);
}
if ((ParsedObject = PDFObjectDefinition.TryParse(Token, Data, StartTokenIndex, out EndingIndex)) != null)
{
return(ParsedObject);
}
if ((ParsedObject = PDFIndirectObject.TryParse(Token, Data, StartTokenIndex, out EndingIndex)) != null)
{
return(ParsedObject);
}
if ((ParsedObject = PDFNumber.TryParse(Token, Data, StartTokenIndex, out EndingIndex)) != null)
{
return(ParsedObject);
}
if ((ParsedObject = PDFName.TryParse(Token, Data, StartTokenIndex, out EndingIndex)) != null)
{
return(ParsedObject);
}
if ((ParsedObject = PDFComment.TryParse(Token, Data, StartTokenIndex, out EndingIndex)) != null)
{
return(ParsedObject);
}
}
// Could not parse next object
EndingIndex = StartingIndex;
return(null);
}
/// <summary>
/// Return the offset into the PDF file where an object with the given object number is defined
/// </summary>
/// <param name="indirectObject">Indirect object reference to the object of interest</param>
/// <param name="MatchGeneration">Should the generation number for the object be matched as well? (default: false)</param>
/// <returns>Offset into PDF file of object definition, or 0 if object is not found in this cross reference section or represents a deleted object</returns>
public int OffsetForObject(PDFIndirectObject indirectObject, bool MatchGeneration = false)
{
if (this.ContainsObject(indirectObject, MatchGeneration))
{
return(ObjectOffsets[indirectObject.ObjectNumber - StartingObject]);
}
else
{
// Search subsections for object
foreach (PDFCrossReference section in this.Subsections)
{
if (section.ContainsObject(indirectObject, MatchGeneration))
{
return(section.OffsetForObject(indirectObject));
}
}
return(0);
}
}
/// <summary>
/// Does this cross reference section contain information for the given object?
/// </summary>
/// <param name="indirectObject">Indirect object reference to the object of interest</param>
/// <param name="MatchGeneration">Should the generation number for the object be matched as well? (default: false)</param>
/// <returns>TRUE if this cross reference section contains information about the given object, FALSE otherwise</returns>
public bool ContainsObject(PDFIndirectObject indirectObject, bool MatchGeneration = false)
{
return(ContainsObject(indirectObject.ObjectNumber) &&
(!MatchGeneration || (GenerationForObject(indirectObject.ObjectNumber) == indirectObject.GenerationNumber)));
}
