/**
* Processes PDFObjects and returns words
*
*/
public List <Words> GetWords(PDFTextPageObject TextObject, List <Words> WordObjects)
{
Words Word;
bool firstCharacter;
FontsProcessor fontsProcessor = new FontsProcessor();
PDFGlyphCollection GlyphCollection = TextObject.Glyphs;
if (WordObjects.Count == 0 || WordObjects[WordObjects.Count - 1].WordComplete)
{
firstCharacter = true;
Word = new Words();
}
else
{
firstCharacter = false;
Word = WordObjects[WordObjects.Count - 1];
Word.Added = false;
WordObjects.RemoveAt(WordObjects.Count - 1);
}
for (int i = 0; i < GlyphCollection.Count; i++)
{
if (String.IsNullOrWhiteSpace(GlyphCollection[i].Text))
{
firstCharacter = true;
if (!String.IsNullOrEmpty(Word.Word))
{
Word.WordComplete = true;
if (!Word.Added)
{
Word.Added = true;
WordObjects.Add(Word);
}
Word = new Words();
}
}
else
{
Word.Word = Word.Word + GlyphCollection[i].Text;
if (firstCharacter)
{
firstCharacter = false;
Word.FontBase = fontsProcessor.GetFontBase(TextObject.FontName, TextObject.FontSize);
Word.FontBrush = new PDFBrush(TextObject.FillColor);
Word.Top = GlyphCollection[i].DisplayBounds.Top;
Word.Left = GlyphCollection[i].DisplayBounds.Left;
}
}
}
if (Word.Word != "")
{
Word.Added = true;
WordObjects.Add(Word);
}
return(WordObjects);
}
/**
* Processes PDFObjects and returns blocks
*
*/
public List <Blocks> GetBlocks(PDFTextPageObject TextObject, List <Blocks> BlockList)
{
Blocks block;
bool firstCharacter;
FontsProcessor fontsProcessor = new FontsProcessor();
PDFGlyphCollection GlyphCollection = TextObject.Glyphs;
if (BlockList.Count == 0 || BlockList[BlockList.Count - 1].BlockComplete)
{
firstCharacter = true;
block = new Blocks();
}
else
{
firstCharacter = false;
block = BlockList[BlockList.Count - 1];
BlockList.RemoveAt(BlockList.Count - 1);
}
for (int i = 0; i < GlyphCollection.Count; i++)
{
block.Block = block.Block + GlyphCollection[i].Text;
if (block.Block.Length == 16)
{
block.BlockComplete = true;
BlockList.Add(block);
if (++i >= GlyphCollection.Count)
{
return(BlockList);
}
firstCharacter = true;
block = new Blocks();
block.Block = block.Block + GlyphCollection[i].Text;
}
if (firstCharacter)
{
firstCharacter = false;
block.FontBase = fontsProcessor.GetFontBase(TextObject.FontName, TextObject.FontSize);
block.FontBrush = new PDFBrush(TextObject.FillColor);
block.Top.Add(GlyphCollection[i].DisplayBounds.Top);
block.Left.Add(GlyphCollection[i].DisplayBounds.Left);
}
else
{
if (GlyphCollection[i].DisplayBounds.Top > block.TopOfLastCharacter)
{
block.Chunks.Add(block.Block.Length - 1);
block.Top.Add(GlyphCollection[i].DisplayBounds.Top);
block.Left.Add(GlyphCollection[i].DisplayBounds.Left);
}
}
block.TopOfLastCharacter = GlyphCollection[i].DisplayBounds.Top;
}
BlockList.Add(block);
return(BlockList);
}
/**
* Recontructs the encrypted shares of the PDF to get original PDF.
* Hightlights every occurrences of the word that a user has searched for.
*
*/
public void SharesReconstructor()
{
List <List <PDFPageObjectCollection> > pDFPageObjects = ExtractObjects();
List <PDFPageObjectCollection> ObjectsPerPage;
PDFBrush redBrush = new PDFBrush(new PDFRgbColor(204, 255, 51));
PDFPen pen = new PDFPen(new PDFRgbColor(204, 255, 51), 1);
string[] shares;
for (int pageIndex = 0; pageIndex < pDFPageObjects.Count; pageIndex++)
{
_decryptedPDF.AddPage();
ObjectsPerPage = pDFPageObjects[pageIndex];
for (int wordIndex = 0; wordIndex < ObjectsPerPage[0].Count; wordIndex++)
{
shares = new string[_shareforRec];
PDFTextPageObject TextObject = null;
FontsProcessor fontsProcessor = null;
bool shouldProcess = false;
for (int shareIndex = 0; shareIndex < _shareforRec; shareIndex++)
{
PDFPageObjectCollection collection = ObjectsPerPage[shareIndex];
if (collection[wordIndex] is PDFTextPageObject)
{
TextObject = (PDFTextPageObject)collection[wordIndex];
if (TextObject.Text == "PDF4NET evaluation version 5.0.1.0")
{
shouldProcess = false;
break;
}
shares[shareIndex] = TextObject.Text;
fontsProcessor = new FontsProcessor();
shouldProcess = true;
}
}
if (shouldProcess)
{
string decryptedText = ShareAssembler.TextReconstruction(shares, _shareNumbers, _numOfShares, _shareforRec);
PDFBrush brush = new PDFBrush(TextObject.FillColor);
PDFFontBase FontBase = fontsProcessor.GetFontBase(TextObject.FontName, TextObject.FontSize);
if (decryptedText.ToLower().Equals(_keyword.ToLower()))
{
_decryptedPDF.Pages[pageIndex].Canvas.DrawRectangle(pen, redBrush, TextObject.DisplayBounds.Left, TextObject.DisplayBounds.Top, 4 * decryptedText.Length, FontBase.Size, 0);
for (int i = 0; i < _encryptedPdf.Count; i++)
{
_encryptedPdf[i].Pages[pageIndex].Canvas.DrawRectangle(pen, redBrush, TextObject.DisplayBounds.Left, TextObject.DisplayBounds.Top, 4 * decryptedText.Length, FontBase.Size, 0);
_encryptedPdf[i].Pages[pageIndex].Canvas.DrawText(shares[i > shares.Length - 1 ? 0 : i], FontBase, brush, TextObject.DisplayBounds.Left, TextObject.DisplayBounds.Top);
}
}
_decryptedPDF.Pages[pageIndex].Canvas.DrawText(decryptedText, FontBase, brush, TextObject.DisplayBounds.Left, TextObject.DisplayBounds.Top);
}
}
}
for (int i = 0; i < _encryptedPdf.Count; i++)
{
_encryptedPdf[i].Save(_encryptedFilePath + (i + 1) + ".pdf");
}
_decryptedPDF.Save(_decryptedFilePath);
}