/// <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>
/// Determine the maximum PDF version of a PDF file
/// </summary>
/// <param name="Pathname">Full pathname to the PDF file</param>
/// <param name="isBinary">Does the PDF header indicate binary content?</param>
/// <returns>PDF version number (1.0 - 1.7) as indicated by the PDF header, or 0.0 if file does not appear to be a PDF file</returns>
private float ReadPDFHeader(out bool isBinary)
{
int CommentEnd;
float HeaderVersion = 0.0f;
// Check for PDF version
byte[] HeaderBytes;
PDFComment.ExtractPDFComment(RawData, out HeaderBytes, out _, out CommentEnd);
if (HeaderBytes.Length > 5)
{
string HeaderComment = Encoding.UTF8.GetString(HeaderBytes);
if ("%PDF-".Equals(HeaderComment.Substring(0, 5)))
{
if (!float.TryParse(HeaderComment.Substring(5), out HeaderVersion))
{
HeaderVersion = 0.0f;
}
}
}
// Check for 8-bit-data flag
isBinary = false;
byte[] NextBytes = PDF.ExtractPDFLine(RawData, CommentEnd, out CommentEnd); // Read to next EOL
PDFComment.ExtractPDFComment(NextBytes, out HeaderBytes, out _, out CommentEnd); // Attempt to find a comment line
if (HeaderBytes != null)
{
int binCount = 0;
foreach (byte Byte in HeaderBytes)
{
binCount = binCount + (Byte > 128 ? 1 : 0);
}
isBinary = (binCount > 3);
}
return(HeaderVersion);
}
