public static string GetHash(string Name)
{
if (Name == string.Empty)
return string.Empty;
CRC crc = new CRC();
string Hash = string.Empty;
using (FileStream fileStream = File.Open(Name, FileMode.Open))
{
foreach (byte b in crc.ComputeHash(fileStream))
{
Hash += b.ToString("x2").ToLower();
}
}
return Hash;
}
public static uint Compute(uint polynomial, uint seed, byte[] buffer)
{
return(~CRC.CalculateHash(CRC.InitializeTable(polynomial), seed, buffer, 0, buffer.Length));
}
public static uint Compute(uint seed, byte[] buffer)
{
return(CRC.Compute(0xedb88320, seed, buffer));
}
public static uint Compute(byte[] buffer)
{
return(CRC.Compute(uint.MaxValue, buffer));
}
protected override byte[] HashFinal()
{
byte[] array = CRC.UInt32ToBigEndianBytes(~this.hash);
this.HashValue = array;
return(array);
}
protected override void HashCore(byte[] buffer, int start, int length)
{
this.hash = CRC.CalculateHash(this.table, this.hash, buffer, start, length);
}
public CRC(uint polynomial, uint seed)
{
this.table = CRC.InitializeTable(polynomial);
this.hash = seed;
this.seed = seed;
}
public static uint Compute(uint seed, byte[] buffer)
{
return(CRC.Compute(3988292384U, seed, buffer));
}
protected override byte[] HashFinal()
{
byte[] bigEndianBytes = CRC.UInt32ToBigEndianBytes(~this.hash);
this.HashValue = bigEndianBytes;
return(bigEndianBytes);
}
private string GetHash(string Name)
{
if (Name == string.Empty)
return null;
CRC crc = new CRC();
string Hash = string.Empty;
try
{
using (FileStream fileStream = File.Open(Name, FileMode.Open))
{
foreach (byte b in crc.ComputeHash(fileStream))
{
Hash += b.ToString("x2").ToLower();
}
}
}
catch
{
MessageBox.Show(Name + " cannot be opened.");
}
return Hash;
}
