public override string Extract(Stream stream)
{
//IFilter
var target = new FilterReader(GetBytesFromStream(stream), ".xls");
target.Init();
return(target.ReadToEnd());
}
public override string Extract(Stream stream, TextExtractorContext context)
{
try
{
//extract text using IFilter
var target = new FilterReader(GetBytesFromStream(stream), ".pdf");
target.Init();
return(target.ReadToEnd());
}
catch (OutOfMemoryException ex)
{
Logger.WriteWarning(EventId.Indexing.BinaryIsTooLarge,
"Pdf text extract failed with out of memory exception. " + ex,
properties: new Dictionary <string, object> {
{ "Stream size", stream.Length }
});
return(string.Empty);
}
catch (Exception ex)
{
Logger.WriteWarning(EventId.Indexing.IFilterError, "Pdf IFilter error: " + ex.Message);
}
//fallback to the other mechanism in case the pdf IFilter is missing
var text = new StringBuilder();
try
{
var pdfReader = new PdfReader(stream);
for (var page = 1; page <= pdfReader.NumberOfPages; page++)
{
// extract text using the old version (4.1.6) of iTextSharp
var pageText = ExtractTextFromPdfBytes(pdfReader.GetPageContent(page));
if (string.IsNullOrEmpty(pageText))
{
continue;
}
text.Append(pageText);
}
}
catch (OutOfMemoryException ex)
{
Logger.WriteWarning(EventId.Indexing.BinaryIsTooLarge,
"Pdf text extract failed with out of memory exception. " + ex,
properties: new Dictionary <string, object> {
{ "Stream size", stream.Length }
});
}
return(text.ToString());
}
public override string Extract(Stream stream, TextExtractorContext context)
{
try
{
//IFilter
var target = new FilterReader(GetBytesFromStream(stream), ".msg");
target.Init();
return(target.ReadToEnd());
}
catch (Exception ex)
{
Logger.WriteWarning(EventId.Indexing.IFilterError, "Msg IFilter error: " + ex.Message);
}
return(string.Empty);
}
public override string Extract(System.IO.Stream stream)
{
try
{
//IFilter
var target = new FilterReader(GetBytesFromStream(stream), ".doc");
target.Init();
return(target.ReadToEnd());
}
catch (Exception ex)
{
Logger.WriteWarning(EventId.Indexing.IFilterError, "Doc IFilter error: " + ex.Message);
}
return(string.Empty);
}