public static void RedactCharacters(Doc doc, IList <TextFragment> fragments)
{
if (fragments.Count == 0)
{
return;
}
ResourceTracker tracker = new ResourceTracker(doc);
Dictionary <int, List <TextFragment> > streams = new Dictionary <int, List <TextFragment> >();
foreach (TextFragment fragment in fragments)
{
List <TextFragment> redactions = null;
int id = tracker.CopyOnWrite(fragment.StreamID, fragment.PageID);
streams.TryGetValue(id, out redactions);
if (redactions == null)
{
redactions = new List <TextFragment>();
streams[id] = redactions;
}
redactions.Add(fragment);
}
foreach (KeyValuePair <int, List <TextFragment> > pair in streams)
{
// get data
StreamObject stream = doc.ObjectSoup[pair.Key] as StreamObject;
Debug.Assert(stream != null); // should never happen
stream.Decompress(); // shouldn't really be necessary
Debug.Assert(stream.Compressed == false); // should never happen
byte[] data = stream.GetData();
// construct new stream
List <TextFragment> redactions = pair.Value;
redactions.Sort((x, y) => x.StreamOffset.CompareTo(y.StreamOffset));
MemoryStream mem = new MemoryStream(data.Length);
int p = 0;
for (int i = 0; i < redactions.Count; i++)
{
TextFragment redaction = redactions[i];
RedactionGroup group = new RedactionGroup(data);
for (int j = i; j < redactions.Count; j++)
{
if (!group.Add(redactions[j]))
{
i = j - 1;
break;
}
}
if (p < redaction.StreamOffset)
{
mem.Write(data, p, redaction.StreamOffset - p);
byte[] tjBytes = group.GetTextOperator().GetData();
mem.Write(tjBytes, 1, tjBytes.Length - 2);
}
p = redaction.StreamOffset + redaction.StreamLength;
}
mem.Write(data, p, data.Length - p);
stream.SetData(mem.ToArray());
}
}
public void Delete()
{
foreach (KeyValuePair <int, List <ImageRendition> > pair in _redactions)
{
StreamObject so = (StreamObject)_doc.ObjectSoup[pair.Key];
List <ImageRendition> renditions = pair.Value;
renditions.Sort((i1, i2) => { return(i1.StreamOffset.CompareTo(i2.StreamOffset)); });
if (!so.Decompress())
{
throw new ArgumentException("Unable to decompress stream.");
}
byte[] data = so.GetData();
foreach (ImageRendition rendition in renditions)
{
for (int i = 0; i < rendition.StreamLength; i++)
{
data[i + rendition.StreamOffset] = 0x20; // space
}
}
so.SetData(data);
so.CompressFlate();
}
}
public static void RedactTextOps(Doc doc, IList <TextFragment> fragments)
{
if (fragments.Count == 0)
{
return;
}
ResourceTracker tracker = new ResourceTracker(doc);
Dictionary <int, List <TextFragment> > streams = new Dictionary <int, List <TextFragment> >();
foreach (TextFragment fragment in fragments)
{
List <TextFragment> redactions = null;
int id = tracker.CopyOnWrite(fragment.StreamID, fragment.PageID);
streams.TryGetValue(id, out redactions);
if (redactions == null)
{
redactions = new List <TextFragment>();
streams[id] = redactions;
}
redactions.Add(fragment);
}
foreach (KeyValuePair <int, List <TextFragment> > pair in streams)
{
// get data
StreamObject stream = doc.ObjectSoup[pair.Key] as StreamObject;
Debug.Assert(stream != null); // should never happen
stream.Decompress(); // shouldn't really be necessary
Debug.Assert(stream.Compressed == false); // should never happen
byte[] data = stream.GetData();
// construct new stream
List <TextFragment> redactions = pair.Value;
redactions.Sort((x, y) => x.StreamOffset.CompareTo(y.StreamOffset));
MemoryStream mem = new MemoryStream(data.Length);
int p = 0;
foreach (TextFragment redaction in redactions)
{
if (p < redaction.StreamOffset)
{
mem.Write(data, p, redaction.StreamOffset - p);
IDictionary <char, int> widths = redaction.Font.Widths;
int defaultWidth = doc.GetInfoInt(redaction.Font.ID, "/DescendantFonts[0]*/DW*");
if (defaultWidth == 0)
{
defaultWidth = 1000;
}
int width1000ths = 0;
foreach (char c in redaction.Text)
{
int width = 0;
if (!widths.TryGetValue(c, out width))
{
width = defaultWidth;
}
width1000ths += defaultWidth;
}
string tj = string.Format("[{0}] TJ\r\n", width1000ths);
byte[] tjBytes = ASCIIEncoding.ASCII.GetBytes(tj);
mem.Write(tjBytes, 0, tjBytes.Length);
}
p = redaction.StreamOffset + redaction.StreamLength;
}
mem.Write(data, p, data.Length - p);
stream.SetData(mem.ToArray());
}
}