public CalculationResult Calc(FileInfo file)
{
CalculationResult result = null;
using (var stream = file.OpenRead())
{
var totalChunkCount = Math.Ceiling(file.Length * 1.0 / ED2K_CHUNK_SIZE);
var chunkCount = 0;
var bufferLength = 0;
var buffer = new byte[ED2K_CHUNK_SIZE];
var md4HashedBytes = new List <byte>();
string hash = null;
while ((bufferLength = stream.Read(buffer, 0, ED2K_CHUNK_SIZE)) > 0)
{
++chunkCount;
var chunkMd4HashedBytes = _md4.GetByteHashFromBytes(buffer.Take(bufferLength).ToArray());
md4HashedBytes.AddRange(chunkMd4HashedBytes);
Program.ClearLine();
Console.Write($"{chunkCount}/{totalChunkCount}: {file.Name} ");
buffer = new byte[ED2K_CHUNK_SIZE];
}
Program.ClearLine();
hash = chunkCount > 1
? _md4.GetHexHashFromBytes(md4HashedBytes.ToArray())
: MD4.BytesToHex(md4HashedBytes.ToArray(), md4HashedBytes.Count);
result = new CalculationResult(file, hash);
}
return(result);
}
/// <summary>
/// This constructor is here to implement the clonability of this class
/// </summary>
/// <param name = "md"> </param>
private MD4(MD4 md) : this()
{
//this();
context = (uint[])md.context.Clone();
buffer = (byte[])md.buffer.Clone();
count = md.count;
}
/// <summary>
/// Returns a binary hash from an input byte array
/// </summary>
/// <param name = "b">byte-array to hash</param>
/// <returns>binary hash of input</returns>
public byte[] GetByteHashFromBytes(byte[] b)
{
var md4 = new MD4();
md4.EngineUpdate(b, 0, b.Length);
return(md4.EngineDigest());
}
/// <summary>
/// Returns a byte hash from the input byte
/// </summary>
/// <param name = "b">byte to hash</param>
/// <returns>binary hash of the input byte</returns>
public byte[] GetByteHashFromByte(byte b)
{
var md4 = new MD4();
md4.EngineUpdate(b);
return(md4.EngineDigest());
}
/// <summary>
/// Returns a byte hash from a string
/// </summary>
/// <param name = "s">string to hash</param>
/// <returns>byte-array that contains the hash</returns>
public byte[] GetByteHashFromString(string s)
{
byte[] b = Encoding.UTF8.GetBytes(s);
var md4 = new MD4();
md4.EngineUpdate(b, 0, b.Length);
return(md4.EngineDigest());
}
