public void Split(string source, long sourceLength, string targetPath, Type readType, Type writeType, Type spliterType, byte numberOfPart)
{
if (!readType.GetInterfaces().Contains(typeof(IGenReader)))
throw new ArgumentException("Incompatible type reader");
if (!writeType.GetInterfaces().Contains(typeof(IGenWriter)))
throw new ArgumentException("Incompatible type writer");
if (!spliterType.GetInterfaces().Contains(typeof(IFileSpliter)))
throw new ArgumentException("Incompatible type spliter");
var writers = new IGenWriter[numberOfPart];
using (var reader = (IGenReader)Activator.CreateInstance(readType))
{
reader.Open(source);
try
{
var spliter = (IFileSpliter)Activator.CreateInstance(spliterType);
var filename = Path.GetFileName(source);
var filenamePart = SplitFileName(filename, spliter, numberOfPart);
Stream[] targets = new Stream[numberOfPart];
for (byte i = 0; i < numberOfPart; i++)
{
writers[i] = (IGenWriter)Activator.CreateInstance(writeType);
writers[i].Open(Utils.WriteFileName(source, targetPath, i));
targets[i] = writers[i].Writer;
var header = new Header()
{
PartIndex = i,
FileName = filenamePart[i],
HashFormat = Guid.Empty,
PartFileHashLength = 0,
OriginalFileLength = sourceLength,
PartFileNameLength = (ushort)filenamePart[i].Length,
SplitFormat = spliter.Protocol,
TotalPartCount = numberOfPart,
TotalFileNameLength = (ushort)filename.Length
};
targets[i].Write(header.WriteHeader(), 0, header.TotalHeaderSize);
}
spliter.Split(targets, reader.Reader, numberOfPart);
}
finally
{
for (byte i = 0; i < numberOfPart; i++)
if (writers[i] != null)
writers[i].Dispose();
}
}
}
public void Shred(string source, Type readType, Type writeType, byte numberOfPart)
{
if (!readType.GetInterfaces().Contains(typeof(IGenReader)))
{
throw new Exception("Incompatible type reader");
}
if (!writeType.GetInterfaces().Contains(typeof(IGenWriter)))
{
throw new Exception("Incompatible type writer");
}
var writer = new IGenWriter[numberOfPart];
string targetFolder = Path.GetDirectoryName(source);
long sourceLength = (new FileInfo(source)).Length; // a déplacer dans une méthode non couplée (ExtFile)
byte[] curRead = new byte[1024];
RandomNumberGenerator rng = RandomNumberGenerator.Create();//shouldn't be pseudo random...
long[] polys = new long[numberOfPart];
//polys[0] = 0;//secret place
using (var reader = (IGenReader)Activator.CreateInstance(readType))
{
reader.Open(source);
try
{
for (byte i = 0; i < numberOfPart; i++)
{
writer[i] = (IGenWriter)Activator.CreateInstance(writeType);
writer[i].Open(writeFileName(source, targetFolder, i));
}
//écriture des metainfos en header.
for (byte i = 0; i < numberOfPart; i++)
{
writer[i].Write(getHeader(sourceLength, numberOfPart, i), 10);
}
int qtyRead = 0;
while ((qtyRead = reader.Read(ref curRead, 1024)) > 0)
{
for (int i = 0; i < qtyRead; i++)
{
polys[0] = curRead[i];
for (int inum = 1; inum < polys.Length; inum++)
{
polys[inum] = RandomInRange(rng, 0, RND_UPPER);
}
for (byte j = 0; j < numberOfPart; j++)
{
long ev = evalPoly(polys, j + 1);
/*for (int k = 0; k < polys.Length; k++)
* Console.Write(polys[k] + "|");
* Console.WriteLine(ev);*/
byte[] share = BitConverter.GetBytes(ev); //Bitev.ToByteArray(); // BitConverter.GetBytes(ev);
//byte[] paddedShare = new byte[STORE_BYTE_SIZE];
//share.CopyTo(paddedShare, 0);
//if (share.Length != STORE_BYTE_SIZE)
// Console.WriteLine("not 16 bytes bigint detected >" + new long(share) +"><"+ new long(paddedShare));
writer[j].Write(share, share.Length);
}
}
}
}
finally
{
for (byte i = 0; i < numberOfPart; i++)
{
if (writer != null)
{
writer[i].Dispose();
}
}
}
}
}
