/**
* When an MCID is encountered, the parser will check the list
* structure items and turn an annotation into an XObject if
* necessary.
* @param mcid the MCID that was encountered in the content stream
* @throws IOException
*/
virtual protected void DealWithMcid(PdfNumber mcid)
{
if (mcid == null)
{
return;
}
StructureItem item = items[0];
if (LOGGER.IsLogging(Level.INFO))
{
LOGGER.Info(String.Format("Encountered MCID {0} in content, comparing with {1}", mcid, item));
}
switch (item.CheckMCID(pageref.Number, mcid.IntValue))
{
case 0:
StructureObject obj = (StructureObject)item;
ConvertToXObject(obj);
LOGGER.Info("Removed structure item from stack.");
items.RemoveAt(0);
DealWithMcid(mcid);
return;
case 1:
LOGGER.Info("Removed structure item from stack.");
items.RemoveAt(0);
return;
default:
LOGGER.Warn("MCID not found! There's probably an error in your form!");
// hack to deal with MCIDs that are added in the wrong order
int check;
for (int i = 1; i < items.Count; i++)
{
item = items[i];
check = item.CheckMCID(pageref.Number, mcid.IntValue);
switch (check)
{
case 1:
LOGGER.Info("Removed structure item from stack.");
items.RemoveAt(i);
return;
case 0:
break;
}
}
throw new DocumentException(MessageLocalization.GetComposedMessage("can.t.read.document.structure"));
}
}
/**
* Processes the kids object of a StructElem dictionary.
* This kids object can be a number (MCID), another StructElem dictionary,
* an MCR dictionary, an OBJR dictionary, or an array of the above.
* @param structElem the StructElem dictionary
* @param ref the reference to the StructElem dictionary
* @param object the kids object
*/
protected virtual void ProcessStructElemKids(PdfDictionary structElem, PdfIndirectReference refa, PdfObject objecta)
{
if (LOGGER.IsLogging(Level.INFO))
{
LOGGER.Info(String.Format("addStructureItem({0}, {1}, {2})", structElem, refa, objecta));
}
if (objecta == null)
{
return;
}
StructureItem item;
switch (objecta.Type)
{
case PdfObject.NUMBER:
item = new StructureMCID(structElem.GetAsIndirectObject(PdfName.PG), (PdfNumber)objecta);
Add(item);
LOGGER.Info("Added " + item);
break;
case PdfObject.ARRAY:
PdfArray array = (PdfArray)objecta;
for (int i = 0; i < array.Size; i++)
{
ProcessStructElemKids(structElem, array.GetAsIndirectObject(i), array.GetDirectObject(i));
}
break;
case PdfObject.DICTIONARY:
PdfDictionary dict = (PdfDictionary)objecta;
if (dict.CheckType(PdfName.MCR))
{
item = new StructureMCID(dict);
Add(item);
LOGGER.Info("Added " + item);
}
else if (dict.CheckType(PdfName.OBJR))
{
item = new StructureObject(structElem, refa, dict);
Add(item);
LOGGER.Info("Added " + item);
}
else
{
ProcessStructElems(dict, refa);
}
break;
}
}
/**
* Converts an annotation structure item to a Form XObject annotation.
* @param item the structure item
* @throws IOException
*/
protected void ConvertToXObject(StructureObject item)
{
PdfDictionary structElem = item.GetStructElem();
if (structElem == null)
{
return;
}
PdfDictionary dict = item.GetObjAsDict();
if (dict == null || !dict.CheckType(PdfName.ANNOT))
{
return;
}
PdfDictionary ap = dict.GetAsDict(PdfName.AP);
if (ap == null)
{
return;
}
PdfNumber structParent = dict.GetAsNumber(PdfName.STRUCTPARENT);
if (structParent == null)
{
return;
}
PdfStream stream = ap.GetAsStream(PdfName.N);
if (stream == null)
{
return;
}
stream.Put(PdfName.STRUCTPARENT, structParent);
PdfIndirectReference xobjr = ap.GetAsIndirectObject(PdfName.N);
if (xobjr == null)
{
return;
}
// remove the annotation from the page
for (int i = 0; i < annots.Length; i++)
{
PdfIndirectReference annotref = annots.GetAsIndirectObject(i);
if (item.GetObjRef().Number == annotref.Number)
{
annots.Remove(i);
break;
}
}
// replace the existing attributes by a PrintField attribute
PdfDictionary attribute = new PdfDictionary();
attribute.Put(PdfName.O, PdfName.PRINTFIELD);
PdfString description = dict.GetAsString(PdfName.TU);
if (description == null)
{
description = dict.GetAsString(PdfName.T);
}
if (PdfName.BTN.Equals(dict.Get(PdfName.FT)))
{
PdfNumber fflags = dict.GetAsNumber(PdfName.FF);
if (fflags != null)
{
int ff = fflags.IntValue;
if ((ff & PdfFormField.FF_PUSHBUTTON) != 0)
{
attribute.Put(PdfName.ROLE, PdfName.PB);
}
// I don't think the condition below will ever be true
if ((ff & PdfFormField.FF_RADIO) != 0)
{
attribute.Put(PdfName.ROLE, PdfName.rb);
}
else
{
attribute.Put(PdfName.ROLE, PdfName.CB);
}
}
}
else
{
attribute.Put(PdfName.ROLE, PdfName.TV);
}
attribute.Put(PdfName.DESC, description);
// Updating the values of the StructElem dictionary
PdfString t = structElem.GetAsString(PdfName.T);
if (t == null || t.ToString().Trim().Length == 0)
{
structElem.Put(PdfName.T, dict.GetAsString(PdfName.T));
}
structElem.Put(PdfName.A, attribute);
structElem.Put(PdfName.S, PdfName.P);
structElem.Put(PdfName.PG, pageref);
// Defining a new MCID
int mcid = items.ProcessMCID(structParents, item.GetRef());
LOGGER.Info("Using MCID " + mcid);
structElem.Put(PdfName.K, new PdfNumber(mcid));
// removing the annotation from the parent tree
items.RemoveFromParentTree(structParent);
// Adding the XObject to the page
PdfName xobj = new PdfName("XObj" + structParent.IntValue);
LOGGER.Info("Creating XObject with name " + xobj);
xobjects.Put(xobj, xobjr);
PdfArray array = dict.GetAsArray(PdfName.RECT);
// Getting the position of the annotation
Rectangle rect = new Rectangle(
array.GetAsNumber(0).FloatValue, array.GetAsNumber(1).FloatValue,
array.GetAsNumber(2).FloatValue, array.GetAsNumber(3).FloatValue);
rect.Normalize();
// A Do operator is forbidden inside a text block
if (inText && !btWrite)
{
LOGGER.Debug("Introducing extra ET");
byte[] bytes = Encoding.ASCII.GetBytes("ET\n");
baos.Write(bytes, 0, bytes.Length);
etExtra = true;
}
// Writing the marked-content sequence with the Do operator
// Note that the position assumes that the CTM wasn't changed in the graphics state
// TODO: do the math if the CTM did change!
ByteBuffer buf = new ByteBuffer();
buf.Append("/P <</MCID ");
buf.Append(mcid);
buf.Append(">> BDC\n");
buf.Append("q 1 0 0 1 ");
buf.Append(rect.Left.ToString(CultureInfo.InvariantCulture));
buf.Append(" ");
buf.Append(rect.Bottom.ToString(CultureInfo.InvariantCulture));
buf.Append(" cm ");
buf.Append(xobj.GetBytes());
buf.Append(" Do Q\n");
buf.Append("EMC\n");
buf.Flush();
buf.WriteTo(baos);
// if we were inside a text block, we've introduced an ET, so we'll need to write a BT
if (inText)
{
btWrite = true;
}
}
/**
* Converts an annotation structure item to a Form XObject annotation.
* @param item the structure item
* @throws IOException
*/
virtual protected void ConvertToXObject(StructureObject item) {
PdfDictionary structElem = item.GetStructElem();
if (structElem == null)
return;
PdfDictionary dict = item.GetObjAsDict();
if (dict == null || !dict.CheckType(PdfName.ANNOT))
return;
PdfDictionary ap = dict.GetAsDict(PdfName.AP);
if (ap == null)
return;
PdfNumber structParent = dict.GetAsNumber(PdfName.STRUCTPARENT);
if (structParent == null)
return;
PdfStream stream = ap.GetAsStream(PdfName.N);
if (stream == null)
return;
stream.Put(PdfName.STRUCTPARENT, structParent);
PdfIndirectReference xobjr = ap.GetAsIndirectObject(PdfName.N);
if (xobjr == null)
return;
// remove the annotation from the page
for (int i = 0; i < annots.Length; i++) {
PdfIndirectReference annotref = annots.GetAsIndirectObject(i);
if (item.GetObjRef().Number == annotref.Number) {
annots.Remove(i);
break;
}
}
// replace the existing attributes by a PrintField attribute
PdfDictionary attribute = new PdfDictionary();
attribute.Put(PdfName.O, PdfName.PRINTFIELD);
PdfString description = dict.GetAsString(PdfName.TU);
if (description == null)
description = dict.GetAsString(PdfName.T);
if (PdfName.BTN.Equals(dict.Get(PdfName.FT))) {
PdfNumber fflags = dict.GetAsNumber(PdfName.FF);
if (fflags != null) {
int ff = fflags.IntValue;
if ((ff & PdfFormField.FF_PUSHBUTTON) != 0)
attribute.Put(PdfName.ROLE, PdfName.PB);
// I don't think the condition below will ever be true
if ((ff & PdfFormField.FF_RADIO) != 0)
attribute.Put(PdfName.ROLE, PdfName.rb);
else
attribute.Put(PdfName.ROLE, PdfName.CB);
}
}
else {
attribute.Put(PdfName.ROLE, PdfName.TV);
}
attribute.Put(PdfName.DESC, description);
// Updating the values of the StructElem dictionary
PdfString t = structElem.GetAsString(PdfName.T);
if (t == null || t.ToString().Trim().Length == 0)
structElem.Put(PdfName.T, dict.GetAsString(PdfName.T));
structElem.Put(PdfName.A, attribute);
structElem.Put(PdfName.S, PdfName.P);
structElem.Put(PdfName.PG, pageref);
// Defining a new MCID
int mcid = items.ProcessMCID(structParents, item.GetRef());
LOGGER.Info("Using MCID " + mcid);
structElem.Put(PdfName.K, new PdfNumber(mcid));
// removing the annotation from the parent tree
items.RemoveFromParentTree(structParent);
// Adding the XObject to the page
PdfName xobj = new PdfName("XObj" + structParent.IntValue);
LOGGER.Info("Creating XObject with name " + xobj);
xobjects.Put(xobj, xobjr);
PdfArray array = dict.GetAsArray(PdfName.RECT);
// Getting the position of the annotation
Rectangle rect = new Rectangle(
array.GetAsNumber(0).FloatValue, array.GetAsNumber(1).FloatValue,
array.GetAsNumber(2).FloatValue, array.GetAsNumber(3).FloatValue);
rect.Normalize();
// A Do operator is forbidden inside a text block
if (inText && !btWrite) {
LOGGER.Debug("Introducing extra ET");
byte[] bytes = Encoding.ASCII.GetBytes("ET\n");
baos.Write(bytes, 0, bytes.Length);
etExtra = true;
}
// Writing the marked-content sequence with the Do operator
// Note that the position assumes that the CTM wasn't changed in the graphics state
// TODO: do the math if the CTM did change!
ByteBuffer buf = new ByteBuffer();
buf.Append("/P <</MCID ");
buf.Append(mcid);
buf.Append(">> BDC\n");
buf.Append("q 1 0 0 1 ");
buf.Append(rect.Left.ToString(CultureInfo.InvariantCulture));
buf.Append(" ");
buf.Append(rect.Bottom.ToString(CultureInfo.InvariantCulture));
buf.Append(" cm ");
buf.Append(xobj.GetBytes());
buf.Append(" Do Q\n");
buf.Append("EMC\n");
buf.Flush();
buf.WriteTo(baos);
// if we were inside a text block, we've introduced an ET, so we'll need to write a BT
if (inText)
btWrite = true;
}
