Text Extraction, Not Image Extraction - pdf

Question

Please help me understand if my solution is correct.
I'm trying to extract text from a PDF file with a LocationTextExtractionStrategy parser. I'm getting exceptions because the ParseContentMethod tries to parse inline images? The code is simple and looks similar to this:
RenderFilter[] filter = { new RegionTextRenderFilter(cropBox) };
ITextExtractionStrategy strategy = new FilteredTextRenderListener(new LocationTextExtractionStrategy(), filter);
PdfTextExtractor.GetTextFromPage(pdfReader, pageNumber, strategy);
I realize the images are in the content stream but I have a PDF file failing to extract text because of inline images. It returns an UnsupportedPdfException of "The filter /DCTDECODE is not supported" and then it finally fails with and InlineImageParseException of "Could not find image data or EI", when all I really care about is the text. The BI/EI exists in my file so I assume this failure is because of the /DCTDECODE exception. But again, I don't care about images, I'm looking for text.
My current solution for this is to add a filterHandler in the InlineImageUtils class that assigns the Filter_DoNothing() filter to the DCTDECODE filterHandler dictionary. This way I don't get exceptions when I have InlineImages with DCTDECODE. Like this:
private static bool InlineImageStreamBytesAreComplete(byte[] samples, PdfDictionary imageDictionary) {
try {
IDictionary<PdfName, FilterHandlers.IFilterHandler> handlers = new Dictionary<PdfName, FilterHandlers.IFilterHandler>(FilterHandlers.GetDefaultFilterHandlers());
handlers[PdfName.DCTDECODE] = new Filter_DoNothing();
PdfReader.DecodeBytes(samples, imageDictionary, handlers);
return true;
} catch (IOException e) {
return false;
}
}
public class Filter_DoNothing : FilterHandlers.IFilterHandler
{
public byte[] Decode(byte[] b, PdfName filterName, PdfObject decodeParams, PdfDictionary streamDictionary)
{
return b;
}
}
My problem with this "fix" is that I had to change the iTextSharp library. I'd rather not do that so I can try to stay compatible with future versions.
Here's the PDF in question:
https://app.box.com/s/7eaewzu4mnby9ogpl2frzjswgqxn9rz5