public static PDFStream MakeStream(PDFDictionary StreamDictionary, byte[] Data, int StartingIndex, out int EndingIndex)
{
int TokEnd;
int StreamLength = 0;
if (StreamDictionary.ContainsKey("Length"))
{
StreamLength = (int)(Decimal.Parse(StreamDictionary["Length"].Description));
}
else
{
StreamLength = PDF.FirstOccurance(Data, Encoding.UTF8.GetBytes("endstream"), StartingIndex);
}
EndingIndex = StartingIndex;
if ("stream".Equals(PDFObjectParser.GetTokenString(Data, EndingIndex, out _, out TokEnd)))
{
if ((StreamLength > 0) && (Data.Length >= TokEnd + 1 + StreamLength))
{
byte[] StreamBytes = new byte[StreamLength];
Array.Copy(Data, TokEnd + 1, StreamBytes, 0, StreamLength);
EndingIndex = TokEnd + 1 + StreamLength;
if (!"endstream".Equals(PDFObjectParser.GetTokenString(Data, EndingIndex, out _, out EndingIndex)))
{
} // Error - missing "endstream"
return(new PDFStream(StreamDictionary, StreamBytes));
}
}
// Unable to make a stream from this data
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)
{
int Number;
EndingIndex = StartingIndex;
if (int.TryParse(StartingToken, out Number))
{
string Declaration = PDFObjectParser.GetTokenString(Data, StartingIndex + StartingToken.Length, out _, out EndingIndex, 2);
if (!String.IsNullOrEmpty(Declaration))
{
Match objMatch = Regex.Match(Declaration, @"([+-]?\d+) obj");
if (objMatch.Success)
{
if (Declaration.Length != objMatch.Length)
{
EndingIndex = EndingIndex - (Declaration.Length - objMatch.Length) - 1;
}
int Generation = int.Parse(objMatch.Groups[1].Value);
// Parse the indirect object content (should be a single object)
IPDFObject PDFObject = PDFObjectParser.Parse(Data, out EndingIndex, EndingIndex);
if (PDFObject != null)
{
int ObjectEndIndex = PDF.FirstOccurance(Data, Encoding.UTF8.GetBytes("endobj"), EndingIndex);
if (ObjectEndIndex > 0)
{
// Format error - tokens after object definition but before "endobj"
}
EndingIndex = ObjectEndIndex + "endobj".Length;
return(new PDFObjectDefinition(Number, Generation, PDFObject));
}
}
}
}
return(null);
}