private long XrefPosition(Tokenizer tokenizer)
{
tokenizer.MoveToEnd();
tokenizer.MoveToPrevious('s');
Token token = tokenizer.Token();
if (!TokenValidator.Validate(token, CharacterSetType.Regular, "startxref"))
{
throw new PdfException(PdfExceptionCodes.INVALID_EOF, "Expected startxref");
}
token = tokenizer.Token();
if (!TokenValidator.IsWhiteSpace(token))
{
throw new PdfException(PdfExceptionCodes.INVALID_EOF, "Expected a whitespace between starxref and position");
}
token = tokenizer.Token();
if (!TokenValidator.IsRegularNumber(token))
{
throw new PdfException(PdfExceptionCodes.INVALID_EOF, "startxref position expected");
}
long xrefPosition = token.ToLong();
token = tokenizer.Token();
if (!TokenValidator.IsDelimiter(token))
{
token = tokenizer.Token();
}
if (!TokenValidator.IsDelimiter(token, "%"))
{
throw new PdfException(PdfExceptionCodes.INVALID_EOF, "Expected %%EOF at end of the file");
}
token = tokenizer.Token();
if (!TokenValidator.IsDelimiter(token, "%"))
{
throw new PdfException(PdfExceptionCodes.INVALID_EOF, "Expected %%EOF at end of the file");
}
token = tokenizer.Token();
if (!TokenValidator.Validate(token, CharacterSetType.Regular, "EOF"))
{
throw new PdfException(PdfExceptionCodes.INVALID_EOF, "Expected %%EOF at end of the file");
}
return(xrefPosition);
}
private void AnalyzeHeader(Tokenizer tokenizer)
{
Token token = tokenizer.Token();
if (!TokenValidator.IsDelimiter(token, "%"))
{
throw new PdfException(PdfExceptionCodes.HEADER_NOT_FOUND, "Header not found");
}
token = tokenizer.Token();
if (!TokenValidator.Validate(token, CharacterSetType.Regular, "PDF-1.1", "PDF-1.2", "PDF-1.3", "PDF-1.4", "PDF-1.5", "PDF-1.6", "PDF-1.7"))
{
throw new PdfException(PdfExceptionCodes.HEADER_NOT_FOUND, "Header not found");
}
}