public DataType Extract(out object data)
{
byte[] bdata = ExtractData();
if (bdata == null || bdata.Length < 0)
{
data = null;
return(DataType.None);
}
data = bdata;
int index = 1;
index += bdata[0];
if (index + 7 > bdata.Length)
{
return(DataType.Binary);
}
int length = BitConverter.ToInt32(bdata, index); index += 4;
if (length < 0 || index + 3 + length > bdata.Length)
{
return(DataType.Binary);
}
string name = Encoding.ASCII.GetString(bdata, index, 3); index += 3;
byte[] ndata = new byte[length];
for (int i = 0; i < length && index < bdata.Length; i++, index++)
{
ndata[i] = bdata[index];
}
switch (name)
{
case "TXT":
data = Encoding.UTF8.GetString(ndata);
return(DataType.Text);
case "BIN":
data = ndata;
return(DataType.Binary);
case "IMG":
System.Drawing.Image img;
MemoryStream ms2 = new MemoryStream(ndata); //JPEG and GIF need the stream to be open for some reason, don't know if GC cleans up after MemoryStreams
img = System.Drawing.Image.FromStream(ms2);
data = img; //Must be disposed by caller
return(DataType.Image);
case "IDX":
using (MemoryStream stream = new MemoryStream(ndata))
{
LinkIndex lindex = new LinkIndex();
byte[] ibuffer = new byte[4], sbuffer = new byte[3];
do
{
if (stream.Read(ibuffer, 0, 4) < 4)
{
throw new PNGMaskException("IDX chunk is corrupt");
}
uint len = BitConverter.ToUInt32(ibuffer, 0);
if (stream.Read(sbuffer, 0, 3) < 3)
{
throw new PNGMaskException("IDX chunk is corrupt");
}
string chunkname = Encoding.ASCII.GetString(sbuffer);
byte[] dbuffer = new byte[len];
if (stream.Read(dbuffer, 0, (int)len) < (int)len)
{
throw new PNGMaskException("IDX chunk is corrupt");
}
using (MemoryStream ms = new MemoryStream(dbuffer))
{
if (chunkname == "IDI")
{
do
{
if (ms.Read(ibuffer, 0, 4) < 4)
{
throw new PNGMaskException("IDI chunk is corrupt");
}
int clen = BitConverter.ToInt32(ibuffer, 0);
byte[] imgbuffer = new byte[clen];
if (ms.Read(imgbuffer, 0, clen) < clen)
{
throw new PNGMaskException("IDI chunk is corrupt");
}
using (MemoryStream imgstream = new MemoryStream(imgbuffer))
lindex.Images.Add(Image.FromStream(imgstream));
} while (ms.Position < ms.Length - 1);
}
else if (chunkname == "IDL")
{
do
{
if (ms.Read(ibuffer, 0, 4) < 4)
{
throw new PNGMaskException("IDL chunk is corrupt");
}
int imgindex = BitConverter.ToInt32(ibuffer, 0);
if (ms.Read(ibuffer, 0, 4) < 4)
{
throw new PNGMaskException("IDL chunk is corrupt");
}
int slen = BitConverter.ToInt32(ibuffer, 0);
byte[] strbuffer = new byte[slen];
if (ms.Read(strbuffer, 0, slen) < slen)
{
throw new PNGMaskException("IDL chunk is corrupt");
}
string title = Encoding.UTF8.GetString(strbuffer);
if (ms.Read(ibuffer, 0, 4) < 4)
{
throw new PNGMaskException("IDL chunk is corrupt");
}
slen = BitConverter.ToInt32(ibuffer, 0);
strbuffer = new byte[slen];
if (ms.Read(strbuffer, 0, slen) < slen)
{
throw new PNGMaskException("IDL chunk is corrupt");
}
string url = Encoding.UTF8.GetString(strbuffer);
lindex.Rows.Add(new LinkIndexRow(imgindex, title, url));
} while (ms.Position < ms.Length - 1);
}
}
} while (stream.Position < stream.Length - 1);
data = lindex;
}
return(DataType.Index);
default:
return(DataType.Binary);
}
return(DataType.Binary);
}
public void Imprint(DataType type, object obj)
{
List <byte> temp = new List <byte>();
int igarbage = rnd.Next(0x10, 0xFF);
temp.Add((byte)igarbage);
byte[] garbage = new byte[igarbage];
rnd.NextBytes(garbage);
temp.AddRange(garbage);
byte[] data;
switch (type)
{
case DataType.Text:
data = Encoding.UTF8.GetBytes((string)obj);
temp.AddRange(BitConverter.GetBytes(data.Length));
temp.AddRange(HEADER_TXT);
temp.AddRange(data);
break;
case DataType.Binary:
data = (byte[])obj;
temp.AddRange(BitConverter.GetBytes(data.Length));
temp.AddRange(HEADER_BIN);
temp.AddRange(data);
break;
case DataType.ImageBytes:
data = (byte[])obj;
temp.AddRange(BitConverter.GetBytes(data.Length));
temp.AddRange(HEADER_IMG);
temp.AddRange(data);
break;
case DataType.Image:
using (MemoryStream stream = new MemoryStream())
{
((System.Drawing.Image)obj).Save(stream, System.Drawing.Imaging.ImageFormat.Png);
data = stream.ToArray();
}
temp.AddRange(BitConverter.GetBytes(data.Length));
temp.AddRange(HEADER_IMG);
temp.AddRange(data);
break;
case DataType.Index:
LinkIndex index = (LinkIndex)obj;
byte[] buffer;
using (MemoryStream stream = new MemoryStream())
{
/* Image array serialization */
using (MemoryStream imgliststream = new MemoryStream())
{
foreach (Image img in index.Images)
{
using (MemoryStream imgstream = new MemoryStream())
{
img.Save(imgstream, System.Drawing.Imaging.ImageFormat.Png);
buffer = BitConverter.GetBytes((int)imgstream.Length);
imgliststream.Write(buffer, 0, buffer.Length);
buffer = imgstream.ToArray();
imgliststream.Write(buffer, 0, buffer.Length);
}
}
if (imgliststream.Length > 0)
{
buffer = BitConverter.GetBytes((int)imgliststream.Length);
stream.Write(buffer, 0, buffer.Length);
stream.Write(HEADER_IDI, 0, HEADER_IDI.Length);
buffer = imgliststream.ToArray();
stream.Write(buffer, 0, buffer.Length);
}
}
/* Link item array serialization */
using (MemoryStream linkliststream = new MemoryStream())
{
foreach (LinkIndexRow row in index.Rows)
{
//Image index (4b integer)
buffer = BitConverter.GetBytes(row.ImageIndex);
linkliststream.Write(buffer, 0, buffer.Length);
//Title (4b integer (string length), < string)
byte[] charbuffer = Encoding.UTF8.GetBytes(row.Title);
buffer = BitConverter.GetBytes(charbuffer.Length);
linkliststream.Write(buffer, 0, buffer.Length);
linkliststream.Write(charbuffer, 0, charbuffer.Length);
//Title (4b integer (string length), < string)
charbuffer = Encoding.UTF8.GetBytes(row.URL);
buffer = BitConverter.GetBytes(charbuffer.Length);
linkliststream.Write(buffer, 0, buffer.Length);
linkliststream.Write(charbuffer, 0, charbuffer.Length);
}
buffer = BitConverter.GetBytes((int)linkliststream.Length);
stream.Write(buffer, 0, buffer.Length);
stream.Write(HEADER_IDL, 0, HEADER_IDL.Length);
buffer = linkliststream.ToArray();
stream.Write(buffer, 0, buffer.Length);
}
data = stream.ToArray();
}
temp.AddRange(BitConverter.GetBytes(data.Length));
temp.AddRange(HEADER_IDX);
temp.AddRange(data);
break;
default:
throw new NotImplementedException();
}
data = temp.ToArray();
temp = null;
ImprintData(data);
}
public DataType Extract(out object data)
{
byte[] bdata = ExtractData();
if (bdata == null || bdata.Length < 0)
{
data = null;
return DataType.None;
}
data = bdata;
int index = 1;
index += bdata[0];
if (index + 7 > bdata.Length) return DataType.Binary;
int length = BitConverter.ToInt32(bdata, index); index += 4;
if (length < 0 || index + 3 + length > bdata.Length) return DataType.Binary;
string name = Encoding.ASCII.GetString(bdata, index, 3); index += 3;
byte[] ndata = new byte[length];
for (int i = 0; i < length && index < bdata.Length; i++, index++)
ndata[i] = bdata[index];
switch (name)
{
case "TXT":
data = Encoding.UTF8.GetString(ndata);
return DataType.Text;
case "BIN":
data = ndata;
return DataType.Binary;
case "IMG":
System.Drawing.Image img;
MemoryStream ms2 = new MemoryStream(ndata); //JPEG and GIF need the stream to be open for some reason, don't know if GC cleans up after MemoryStreams
img = System.Drawing.Image.FromStream(ms2);
data = img; //Must be disposed by caller
return DataType.Image;
case "IDX":
using (MemoryStream stream = new MemoryStream(ndata))
{
LinkIndex lindex = new LinkIndex();
byte[] ibuffer = new byte[4], sbuffer = new byte[3];
do
{
if (stream.Read(ibuffer, 0, 4) < 4) throw new PNGMaskException("IDX chunk is corrupt");
uint len = BitConverter.ToUInt32(ibuffer, 0);
if (stream.Read(sbuffer, 0, 3) < 3) throw new PNGMaskException("IDX chunk is corrupt");
string chunkname = Encoding.ASCII.GetString(sbuffer);
byte[] dbuffer = new byte[len];
if (stream.Read(dbuffer, 0, (int)len) < (int)len) throw new PNGMaskException("IDX chunk is corrupt");
using (MemoryStream ms = new MemoryStream(dbuffer))
{
if (chunkname == "IDI")
{
do
{
if (ms.Read(ibuffer, 0, 4) < 4) throw new PNGMaskException("IDI chunk is corrupt");
int clen = BitConverter.ToInt32(ibuffer, 0);
byte[] imgbuffer = new byte[clen];
if (ms.Read(imgbuffer, 0, clen) < clen) throw new PNGMaskException("IDI chunk is corrupt");
using (MemoryStream imgstream = new MemoryStream(imgbuffer))
lindex.Images.Add(Image.FromStream(imgstream));
} while (ms.Position < ms.Length - 1);
}
else if (chunkname == "IDL")
{
do
{
if (ms.Read(ibuffer, 0, 4) < 4) throw new PNGMaskException("IDL chunk is corrupt");
int imgindex = BitConverter.ToInt32(ibuffer, 0);
if (ms.Read(ibuffer, 0, 4) < 4) throw new PNGMaskException("IDL chunk is corrupt");
int slen = BitConverter.ToInt32(ibuffer, 0);
byte[] strbuffer = new byte[slen];
if (ms.Read(strbuffer, 0, slen) < slen) throw new PNGMaskException("IDL chunk is corrupt");
string title = Encoding.UTF8.GetString(strbuffer);
if (ms.Read(ibuffer, 0, 4) < 4) throw new PNGMaskException("IDL chunk is corrupt");
slen = BitConverter.ToInt32(ibuffer, 0);
strbuffer = new byte[slen];
if (ms.Read(strbuffer, 0, slen) < slen) throw new PNGMaskException("IDL chunk is corrupt");
string url = Encoding.UTF8.GetString(strbuffer);
lindex.Rows.Add(new LinkIndexRow(imgindex, title, url));
} while (ms.Position < ms.Length - 1);
}
}
} while (stream.Position < stream.Length - 1);
data = lindex;
}
return DataType.Index;
default:
return DataType.Binary;
}
return DataType.Binary;
}
