/// <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>
/// Attempt to parse the given data stream, returning an indicator of parse progress
/// </summary>
/// <param name="StartingToken">The token immediately preceeding the starting index in Data stream</param>
/// <param name="Data">Raw byte stream to parse</param>
/// <param name="StartingIndex">0-based starting index into Data where StartingToken appears</param>
/// <param name="EndingIndex">Index into data stream where parsing ended (either successfully or unsuccessfully)</param>
/// <returns>Object parsed from data stream, or NULL if unable to parse. If NULL and EndingIndex is equal to Data.Length, parsing may be successful with more data</returns>
public static IPDFObject TryParse(string StartingToken, byte[] Data, int StartingIndex, out int EndingIndex)
{
EndingIndex = StartingIndex;
if (!String.IsNullOrEmpty(StartingToken) && (StartingToken[0] == '['))
{
PDFArray ObjectArray = new PDFArray();
EndingIndex = StartingIndex + 1;
while (EndingIndex < Data.Length)
{
IPDFObject nextObject = PDFObjectParser.Parse(Data, out EndingIndex, EndingIndex);
if (nextObject != null)
{
ObjectArray.Add(nextObject);
}
byte nextChar = PDF.Whitespace[0];
while (PDF.IsWhitespace(nextChar))
{
nextChar = Data[EndingIndex++];
}
if (nextChar == ']')
{
return(ObjectArray);
}
else
{
EndingIndex--;
}
}
}
return(null);
}