/// <summary>
/// Parses a stream object and removes OCGs. </summary>
/// <param name="stream"> a stream object </param>
/// <param name="resources"> the resources dictionary of that object (containing info about the OCGs) </param>
public virtual void Parse(PRStream stream, PdfDictionary resources)
{
baos = new MemoryStream();
properties = resources.GetAsDict(PdfName.PROPERTIES);
xobj = new HashSet2 <PdfName>();
PdfDictionary xobjects = resources.GetAsDict(PdfName.XOBJECT);
if (xobjects != null)
{
// remove XObject (form or image) that belong to an OCG that needs to be removed
foreach (PdfName name in xobjects.Keys)
{
PRStream xobject = (PRStream)xobjects.GetAsStream(name);
PdfDictionary oc = xobject.GetAsDict(PdfName.OC);
if (oc != null)
{
PdfString ocname = oc.GetAsString(PdfName.NAME);
if (ocname != null && ocgs.Contains(ocname.ToString()))
{
xobj.Add(name);
}
}
}
foreach (PdfName name in xobj)
{
xobjects.Remove(name);
}
}
// parse the content stream
byte[] contentBytes = PdfReader.GetStreamBytes(stream);
PRTokeniser tokeniser = new PRTokeniser(new RandomAccessFileOrArray(contentBytes));
PdfContentParser ps = new PdfContentParser(tokeniser);
List <PdfObject> operands = new List <PdfObject>();
while (ps.Parse(operands).Count > 0)
{
PdfLiteral @operator = (PdfLiteral)operands[operands.Count - 1];
ProcessOperator(this, @operator, operands);
}
baos.Flush();
baos.Close();
stream.SetData(baos.GetBuffer());
}
/// <summary>
/// Parses a stream object and removes OCGs. </summary>
/// <param name="stream"> a stream object </param>
/// <param name="resources"> the resources dictionary of that object (containing info about the OCGs) </param>
public virtual void Parse(PRStream stream, PdfDictionary resources)
{
baos = new MemoryStream();
properties = resources.GetAsDict(PdfName.PROPERTIES);
xobj = new HashSet2 <PdfName>();
PdfDictionary xobjects = resources.GetAsDict(PdfName.XOBJECT);
if (xobjects != null)
{
// remove XObject (form or image) that belong to an OCG that needs to be removed
foreach (PdfName name in xobjects.Keys)
{
PRStream xobject = (PRStream)xobjects.GetAsStream(name);
PdfDictionary oc = xobject.GetAsDict(PdfName.OC);
if (oc != null)
{
PdfString ocname = oc.GetAsString(PdfName.NAME);
if (ocname != null && ocgs.Contains(ocname.ToString()))
{
xobj.Add(name);
}
}
}
foreach (PdfName name in xobj)
{
xobjects.Remove(name);
}
}
// parse the content stream
byte[] contentBytes = PdfReader.GetStreamBytes(stream);
PRTokeniser tokeniser = new PRTokeniser(new RandomAccessFileOrArray(contentBytes));
PdfContentParser ps = new PdfContentParser(tokeniser);
List <PdfObject> operands = new List <PdfObject>();
while (ps.Parse(operands).Count > 0)
{
PdfLiteral @operator = (PdfLiteral)operands[operands.Count - 1];
ProcessOperator(this, @operator, operands);
if ("BI".Equals(@operator.ToString()))
{
int found = 0;
int ch;
bool immediateAfterBI = true;
while ((ch = tokeniser.Read()) != -1)
{
if (!immediateAfterBI || !PRTokeniser.IsWhitespace(ch))
{
baos.WriteByte((byte)ch);
}
immediateAfterBI = false;
if (found == 0 && PRTokeniser.IsWhitespace(ch))
{
found++;
}
else if (found == 1 && ch == 'E')
{
found++;
}
else if (found == 1 && PRTokeniser.IsWhitespace(ch))
{
// this clause is needed if we have a white space character that is part of the image data
// followed by a whitespace character that precedes the EI operator. In this case, we need
// to flush the first whitespace, then treat the current whitespace as the first potential
// character for the end of stream check. Note that we don't increment 'found' here.
}
else if (found == 2 && ch == 'I')
{
found++;
}
else if (found == 3 && PRTokeniser.IsWhitespace(ch))
{
break;
}
else
{
found = 0;
}
}
}
}
baos.Flush();
baos.Close();
stream.SetData(baos.GetBuffer());
}
private Bitmap GetImagesFromPdfDict(PdfDictionary dict)
{
PdfDictionary res = (PdfDictionary)(PdfReader.GetPdfObject(dict.Get(PdfName.RESOURCES)));
PdfDictionary xobj = (PdfDictionary)(PdfReader.GetPdfObject(res.Get(PdfName.XOBJECT)));
Bitmap bm = null;
if (xobj != null)
{
foreach (PdfName name in xobj.Keys)
{
PdfObject obj = xobj.Get(name);
if (obj.IsIndirect())
{
PdfDictionary tg = (PdfDictionary)(PdfReader.GetPdfObject(obj));
PdfName subtype = (PdfName)(PdfReader.GetPdfObject(tg.Get(PdfName.SUBTYPE)));
if (PdfName.IMAGE.Equals(subtype))
{
int xrefIdx = ((PRIndirectReference)obj).Number;
PdfObject pdfObj = this.reader.GetPdfObject(xrefIdx);
PRStream str = (PRStream)(pdfObj);
PdfArray decode = tg.GetAsArray(PdfName.DECODE);
int width = tg.GetAsNumber(PdfName.WIDTH).IntValue;
int height = tg.GetAsNumber(PdfName.HEIGHT).IntValue;
int bpc = tg.GetAsNumber(PdfName.BITSPERCOMPONENT).IntValue;
var filter = tg.Get(PdfName.FILTER);
if (filter.Equals(PdfName.FLATEDECODE))
{
var imageBytes = PdfReader.GetStreamBytesRaw(str);
var decodedBytes = PdfReader.FlateDecode(imageBytes); //decode the raw image
var streamBytes = PdfReader.DecodePredictor(decodedBytes, str.GetAsDict(PdfName.DECODEPARMS)); //decode predict to filter the bytes
var pixelFormat = PixelFormat.Format1bppIndexed;
switch (bpc) //determine the BPC
{
case 1:
pixelFormat = PixelFormat.Format1bppIndexed;
break;
case 8:
pixelFormat = PixelFormat.Format8bppIndexed;
break;
case 24:
pixelFormat = PixelFormat.Format24bppRgb;
break;
}
bm = new Bitmap(width, height, pixelFormat);
{
var bmpData = bm.LockBits(new System.Drawing.Rectangle(0, 0, width, height), ImageLockMode.WriteOnly, pixelFormat);
var length = (int)Math.Ceiling(width * bpc / 8.0);
for (int i = 0; i < height; i++)
{
int offset = i * length;
int scanOffset = i * bmpData.Stride;
Marshal.Copy(streamBytes, offset, new IntPtr(bmpData.Scan0.ToInt32() + scanOffset), length);
}
bm.UnlockBits(bmpData);
}
}
else
{
iTextSharp.text.pdf.parser.PdfImageObject pdfImage = new iTextSharp.text.pdf.parser.PdfImageObject(str);
bm = (System.Drawing.Bitmap)pdfImage.GetDrawingImage();
}
int yDPI = bm.Height / 11;
int xDPI = (bm.Width * 2) / 17;
xDPI = Math.Abs(xDPI - 300) < 10 ? 300 : xDPI;
yDPI = Math.Abs(yDPI - 300) < 10 ? 300 : yDPI;
xDPI = Math.Abs(xDPI - 600) < 10 ? 600 : xDPI;
yDPI = Math.Abs(yDPI - 600) < 10 ? 600 : yDPI;
if (xDPI == yDPI)
{
bm.SetResolution(xDPI, yDPI);
}
else
{
}
break;
}
else if (PdfName.FORM.Equals(subtype) || PdfName.GROUP.Equals(subtype))
{
GetImagesFromPdfDict(tg);
}
}
}
}
return(bm);
}
