public void manual_decoding(List <EncodedChunk> encoded_list)
{
Console.Out.WriteLine("Manual testing in progress...");
/*List<EncodedChunk> encoded_list_copy = new List<EncodedChunk>(encoded_list);
*
* int i = 0;
*
* string chunk_filename = "F:/LiveProjects/C#Rookie/ManualNC" + (i + 1) + ".mp3";
* FileStream fp = new FileStream(chunk_filename, FileMode.Create, FileAccess.Write);
*
* // write the encoded data part of EC to this file
* // ready_chunks[z] = 1;
* int byte_count = 0;
* int total_bytes = (int)encoded_list_copy[1].encoded_data_part.Length;
*
*
* while (byte_count < total_bytes)
* {
* byte temp = new byte();
*
* temp = Convert.ToByte(encoded_list[1].encoded_data_part[byte_count]);
* byte_count++;
* fp.WriteByte(temp);
* }
* fp.Close();
* Console.WriteLine("writing NC" + (i + 1) + " done");*/
EncodedChunk ec = new EncodedChunk();
BinaryFormatter bin = new BinaryFormatter();
FileStream fs = new FileStream("F:/LiveProjects/C#Rookie/EncodedChunk.0001.dat", FileMode.Open, FileAccess.ReadWrite);
ec = (EncodedChunk)bin.Deserialize(fs);
fs.Write(ec.encoded_data_part, 0, ec.encoded_data_part.Length);
fs.Close();
fs = new FileStream("F:/LiveProjects/C#Rookie/EncodedChunk.mp3", FileMode.Create, FileAccess.Write);
fs.Write(ec.encoded_data_part, 0, (int)ec.encoded_data_part.Length);
fs.Close();
}
public void manual_decoding(List<EncodedChunk> encoded_list)
{
Console.Out.WriteLine("Manual testing in progress...");
/*List<EncodedChunk> encoded_list_copy = new List<EncodedChunk>(encoded_list);
int i = 0;
string chunk_filename = "F:/LiveProjects/C#Rookie/ManualNC" + (i + 1) + ".mp3";
FileStream fp = new FileStream(chunk_filename, FileMode.Create, FileAccess.Write);
// write the encoded data part of EC to this file
// ready_chunks[z] = 1;
int byte_count = 0;
int total_bytes = (int)encoded_list_copy[1].encoded_data_part.Length;
while (byte_count < total_bytes)
{
byte temp = new byte();
temp = Convert.ToByte(encoded_list[1].encoded_data_part[byte_count]);
byte_count++;
fp.WriteByte(temp);
}
fp.Close();
Console.WriteLine("writing NC" + (i + 1) + " done");*/
EncodedChunk ec = new EncodedChunk();
BinaryFormatter bin = new BinaryFormatter();
FileStream fs = new FileStream("F:/LiveProjects/C#Rookie/EncodedChunk.0001.dat", FileMode.Open, FileAccess.ReadWrite);
ec = (EncodedChunk)bin.Deserialize(fs);
fs.Write(ec.encoded_data_part, 0, ec.encoded_data_part.Length);
fs.Close();
fs = new FileStream("F:/LiveProjects/C#Rookie/EncodedChunk.mp3", FileMode.Create, FileAccess.Write);
fs.Write(ec.encoded_data_part, 0, (int)ec.encoded_data_part.Length);
fs.Close();
}
public List<EncodedChunk> EncodeNormalChunks(List<NormalChunk> chunk_list)
{
/* using LT codes
[1] The degree d, 1 ≤ d ≤ n, of the next packet is chosen at random.
[2] Exactly d blocks from the message are randomly chosen.
[3] If Mi is the ith block of the message, the data portion of the next packet is computed as
Mi1 ^ Mi2 ^....Mid, where {i1, i2, …, id} are the randomly chosen indices for the d blocks
included in this packet.
[4] A prefix is appended to the encoded packet, defining how many blocks n are in the message,
how many blocks d have been exclusive-ored into the data portion of this packet, and the
list of indices {i1, i2, …, id}.
*/
int num_chunks = chunk_list.Count;
int a = 0, length = 0, num_of_repeats = num_chunks + 2; // (num_of_repeats) signifies how many encoded
// chunks need to be generated
Console.WriteLine("Begin encoding...");
Console.WriteLine("Num of encoded chunks that will be generated = " + num_of_repeats);
for (int x = 0; x < num_of_repeats; x++)
{
Random rand = new Random(5555 + x); // use a known seed
int degree = rand.Next(1, num_chunks); // degree for LT codes
Console.WriteLine("degree = " + degree);
List<int> rand_chunk_list = new List<int>(); // array which will contain indicies of random chunk_ids
EncodedChunk ec = new EncodedChunk();
// generate distinct random chunks for encoding
do
{
int r = rand.Next(num_chunks);
if (!rand_chunk_list.Contains(r))
{
rand_chunk_list.Add(r);
}
} while (rand_chunk_list.Count < degree);
Console.Write("Chunks that need to be merged in Round " + x + " = ");
for (int z = 0; z < degree; z++)
{
Console.Write(rand_chunk_list[z] + " ");
}
Console.WriteLine("");
ec.chunk_ids = new List<int>();
for (int z = 0; z < rand_chunk_list.Count; z++)
{
length = chunk_list[rand_chunk_list[z]].data_part.Length;
ec.encoded_data_part = new byte[length];
while (a < length)
{
// XOr'ing
ec.encoded_data_part[a] = Convert.ToByte(ec.encoded_data_part[a] ^
chunk_list[rand_chunk_list[z]].data_part[a]);
a++;
}
a = 0;
ec.chunk_ids.Add(rand_chunk_list[z]);
}
ec.parent_name = chunk_list[0].parent_name;
// Now the EncodedChunk is ready. Write it to a file on hard disk
BinaryFormatter binaryFormatter = new BinaryFormatter();
string encode_filename = "F:/LiveProjects/C#Rookie/EncodedChunk" + "." + String.Format(@"{0:D4}", x) + ".dat";
Stream fp = new FileStream(encode_filename, FileMode.Create, FileAccess.ReadWrite);
try
{
binaryFormatter.Serialize(fp, ec);
}
catch (SerializationException se)
{
Console.WriteLine(se.Message);
}
fp.Flush();
fp.Close();
ec_chunk_list.Add(ec);
Console.WriteLine("Ending Round " + x);
}
return ec_chunk_list;
/* some junk to verify...
BinaryFormatter bin = new BinaryFormatter();
FileStream fs = new FileStream("F:/LiveProjects/C#Rookie/EncodedChunk.0001.dat", FileMode.Open, FileAccess.ReadWrite);
ec = (EncodedChunk)bin.Deserialize(fs);
fs.Write(ec.encoded_data_part, 0, ec.encoded_data_part.Length);
fs.Close();
fs = new FileStream("F:/LiveProjects/C#Rookie/EncodedChunk.mp3", FileMode.Create, FileAccess.Write);
fs.Write(ec.encoded_data_part, 0, (int)ec.encoded_data_part.Length);
fs.Close();*/
}
public List <EncodedChunk> EncodeNormalChunks(List <NormalChunk> chunk_list)
{
/* using LT codes
* [1] The degree d, 1 ≤ d ≤ n, of the next packet is chosen at random.
* [2] Exactly d blocks from the message are randomly chosen.
* [3] If Mi is the ith block of the message, the data portion of the next packet is computed as
* Mi1 ^ Mi2 ^....Mid, where {i1, i2, …, id} are the randomly chosen indices for the d blocks
* included in this packet.
* [4] A prefix is appended to the encoded packet, defining how many blocks n are in the message,
* how many blocks d have been exclusive-ored into the data portion of this packet, and the
* list of indices {i1, i2, …, id}.
*/
int num_chunks = chunk_list.Count;
int a = 0, length = 0, num_of_repeats = num_chunks + 2; // (num_of_repeats) signifies how many encoded
// chunks need to be generated
Console.WriteLine("Begin encoding...");
Console.WriteLine("Num of encoded chunks that will be generated = " + num_of_repeats);
for (int x = 0; x < num_of_repeats; x++)
{
Random rand = new Random(5555 + x); // use a known seed
int degree = rand.Next(1, num_chunks); // degree for LT codes
Console.WriteLine("degree = " + degree);
List <int> rand_chunk_list = new List <int>(); // array which will contain indicies of random chunk_ids
EncodedChunk ec = new EncodedChunk();
// generate distinct random chunks for encoding
do
{
int r = rand.Next(num_chunks);
if (!rand_chunk_list.Contains(r))
{
rand_chunk_list.Add(r);
}
} while (rand_chunk_list.Count < degree);
Console.Write("Chunks that need to be merged in Round " + x + " = ");
for (int z = 0; z < degree; z++)
{
Console.Write(rand_chunk_list[z] + " ");
}
Console.WriteLine("");
ec.chunk_ids = new List <int>();
for (int z = 0; z < rand_chunk_list.Count; z++)
{
length = chunk_list[rand_chunk_list[z]].data_part.Length;
ec.encoded_data_part = new byte[length];
while (a < length)
{
// XOr'ing
ec.encoded_data_part[a] = Convert.ToByte(ec.encoded_data_part[a] ^
chunk_list[rand_chunk_list[z]].data_part[a]);
a++;
}
a = 0;
ec.chunk_ids.Add(rand_chunk_list[z]);
}
ec.parent_name = chunk_list[0].parent_name;
// Now the EncodedChunk is ready. Write it to a file on hard disk
BinaryFormatter binaryFormatter = new BinaryFormatter();
string encode_filename = "F:/LiveProjects/C#Rookie/EncodedChunk" + "." + String.Format(@"{0:D4}", x) + ".dat";
Stream fp = new FileStream(encode_filename, FileMode.Create, FileAccess.ReadWrite);
try
{
binaryFormatter.Serialize(fp, ec);
}
catch (SerializationException se)
{
Console.WriteLine(se.Message);
}
fp.Flush();
fp.Close();
ec_chunk_list.Add(ec);
Console.WriteLine("Ending Round " + x);
}
return(ec_chunk_list);
/* some junk to verify...
* BinaryFormatter bin = new BinaryFormatter();
* FileStream fs = new FileStream("F:/LiveProjects/C#Rookie/EncodedChunk.0001.dat", FileMode.Open, FileAccess.ReadWrite);
* ec = (EncodedChunk)bin.Deserialize(fs);
* fs.Write(ec.encoded_data_part, 0, ec.encoded_data_part.Length);
* fs.Close();
* fs = new FileStream("F:/LiveProjects/C#Rookie/EncodedChunk.mp3", FileMode.Create, FileAccess.Write);
* fs.Write(ec.encoded_data_part, 0, (int)ec.encoded_data_part.Length);
* fs.Close();*/
}
