public void Purge()
{
_doc.PageNumber = 1;
foreach (int id in _containers)
{
IndirectObject io = _doc.ObjectSoup[id];
while (io != null)
{
Atom rez = io.Resolve(Atom.GetItem(io.Atom, "Resources"));
DictAtom fonts = io.Resolve(Atom.GetItem(rez, "Font")) as DictAtom;
if ((fonts != null) && (fonts.Count > 0))
{
List <string> fontsToRemove = new List <string>();
foreach (KeyValuePair <string, Atom> pair in fonts)
{
IndirectObject font = io.ResolveObj(pair.Value);
if (font == null)
{
continue; // shouldn't ever happen
}
if (!_fonts.Contains(font.ID))
{
fontsToRemove.Add(pair.Key);
}
}
foreach (string key in fontsToRemove)
{
fonts.Remove(key);
}
}
io = io.ResolveObj(Atom.GetItem(io.Atom, "Parent"));
}
}
}
public void Purge()
{
// First establish the count of images; per page (or xobject), per image.
Dictionary <int, Dictionary <int, int> > imageCountPerParent = new Dictionary <int, Dictionary <int, int> >();
foreach (ImageProperties image in _images)
{
foreach (ImageRendition rendition in image.Renditions)
{
int parent = rendition.StreamObject is FormXObject ? rendition.StreamID : rendition.PageID;
Dictionary <int, int> imageCount = null;
imageCountPerParent.TryGetValue(parent, out imageCount);
if (imageCount == null)
{
imageCount = new Dictionary <int, int>();
imageCountPerParent[parent] = imageCount;
}
int count = 0;
if (!imageCount.TryGetValue(image.PixMap.ID, out count))
{
imageCount[image.PixMap.ID] = 0;
count = 0;
}
if (!_redactionSet.Contains(rendition))
{
imageCount[image.PixMap.ID] = count + 1;
}
}
}
// Then remove the ones that have been redacted
foreach (KeyValuePair <int, Dictionary <int, int> > pair1 in imageCountPerParent)
{
HashSet <int> imagesToRemove = new HashSet <int>();
foreach (KeyValuePair <int, int> pair2 in pair1.Value)
{
if (pair2.Value == 0) // no references left
{
imagesToRemove.Add(pair2.Key);
}
}
if (imagesToRemove.Count > 0)
{
IndirectObject io = _doc.ObjectSoup[pair1.Key];
while (io != null)
{
Atom rez = io.Resolve(Atom.GetItem(io.Atom, "Resources"));
DictAtom xobjs = io.Resolve(Atom.GetItem(rez, "XObject")) as DictAtom;
if ((xobjs != null) && (xobjs.Count > 0))
{
List <string> namesToRemove = new List <string>();
foreach (KeyValuePair <string, Atom> pair in xobjs)
{
IndirectObject xobj = io.ResolveObj(pair.Value);
if (xobj == null)
{
continue; // shouldn't ever happen
}
if (imagesToRemove.Contains(xobj.ID))
{
namesToRemove.Add(pair.Key);
}
}
foreach (string key in namesToRemove)
{
xobjs.Remove(key);
}
}
io = _imagesCoverWholeDoc ? io.ResolveObj(Atom.GetItem(io.Atom, "Parent")) : null;
}
}
}
}
public void PurgeForm()
{
Catalog cat = _doc.ObjectSoup.Catalog;
Atom form = cat.Resolve(Atom.GetItem(cat.Atom, "AcroForm"));
if (form == null)
{
return;
}
// look at default appearance for documents and widgets
HashSet <string> fontsToKeep = new HashSet <string>();
Atom docDA = cat.Resolve(Atom.GetItem(form, "DA"));
bool needsDocDA = false;
for (int i = 0; i < _doc.PageNumber; i++)
{
_doc.PageNumber = i + 1;
Page page = (Page)_doc.ObjectSoup[_doc.Page];
foreach (Annotation annot in page.GetAnnotations())
{
bool needsDA = false;
if ((annot.FieldType == FieldType.Text) || (annot.FieldType == FieldType.Signature) || (annot.FieldType == FieldType.List) || (annot.FieldType == FieldType.Combo))
{
needsDA = true;
}
else
{
string subtype = Atom.GetName(cat.Resolve(Atom.GetItem(annot.Atom, "Subtype")));
if ((subtype == "FreeText") || ((subtype == "Redact") && (Atom.GetItem(annot.Atom, "OverlayText") != null)))
{
needsDA = true;
}
}
if (!needsDA)
{
continue; // we can ignore this annotation
}
Atom da = cat.Resolve(Atom.GetItem(annot.Atom, "DA"));
if (da == null)
{
needsDocDA = true;
continue; // we add in the doc DA at the end
}
KeepFonts(fontsToKeep, da);
}
}
Debug.Assert((needsDocDA == false) || (docDA != null), "Both Widgets and Document fail to define required DA entry.");
if (!needsDocDA)
{
Atom.RemoveItem(form, "DA");
docDA = null;
}
if (docDA != null)
{
KeepFonts(fontsToKeep, docDA);
}
HashSet <string> fontsToRemove = new HashSet <string>();
Atom rez = cat.Resolve(Atom.GetItem(form, "DR"));
DictAtom fonts = cat.Resolve(Atom.GetItem(rez, "Font")) as DictAtom;
if (fonts != null)
{
foreach (KeyValuePair <string, Atom> pair in fonts)
{
if (!fontsToKeep.Contains(pair.Key))
{
fontsToRemove.Add(pair.Key);
}
}
foreach (string key in fontsToRemove)
{
fonts.Remove(key);
}
}
}