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;
}
}
}
}