/// <summary>
/// Register a new IPFS hashing algorithm.
/// </summary>
/// <param name="name">
/// The name of the algorithm.
/// </param>
/// <param name="code">
/// The IPFS number assigned to the hashing algorithm.
/// </param>
/// <param name="digestSize">
/// The size, in bytes, of the digest value.
/// </param>
/// <param name="hasher">
/// A <c>Func</c> that returns a <see cref="HashAlgorithm"/>. If not specified, then a <c>Func</c> is created to
/// throw a <see cref="NotImplementedException"/>.
/// </param>
/// <returns>
/// A new <see cref="HashingAlgorithm"/>.
/// </returns>
public static HashingAlgorithm Register(string name,
int code,
int digestSize,
Func <HashAlgorithm> hasher = null)
{
if (string.IsNullOrWhiteSpace(name))
{
throw new ArgumentNullException(nameof(name));
}
if (Names.ContainsKey(name))
{
throw new ArgumentException(string.Format("The IPFS hashing algorithm '{0}' is already defined.",
name));
}
if (Codes.ContainsKey(code))
{
throw new ArgumentException(
$"The IPFS hashing algorithm code 0x{code:x2} is already defined.");
}
if (hasher == null)
{
hasher = () => throw new NotImplementedException(
$"The IPFS hashing algorithm '{name}' is not implemented.");
}
var a = new HashingAlgorithm
{
Name = name,
Code = code,
DigestSize = digestSize,
Hasher = hasher
};
Names[name] = a;
Codes[code] = a;
return(a);
}
/// <summary>
/// Remove an IPFS hashing algorithm from the registry.
/// </summary>
/// <param name="algorithm">
/// The <see cref="HashingAlgorithm"/> to remove.
/// </param>
public static void DeRegister(HashingAlgorithm algorithm)
{
Names.Remove(algorithm.Name);
Codes.Remove(algorithm.Code);
}
