/// <summary>
/// Return the hash of the specified file, calculated using the specified hash algorithm.
/// </summary>
/// <param name="algorithm"></param>
/// <param name="filePath"></param>
/// <returns></returns>
public static ImageHash HashImage(HashAlgorithm algorithm, string filePath)
{
ImageHash hash;
switch (algorithm)
{
case HashAlgorithm.DCT:
ulong DCTHash;
NativeFunctions.ph_dct_imagehash(filePath, out DCTHash);
hash = new DCTHash(DCTHash);
break;
case HashAlgorithm.Radial:
NativeStructures.Digest digest;
NativeFunctions.ph_image_digest(filePath, 1, 1, out digest);
hash = new RadialHash(digest);
break;
case HashAlgorithm.MH:
int count;
IntPtr hashBytes = NativeFunctions.ph_mh_imagehash(filePath, out count);
hash = new MHHash(hashBytes, count);
break;
default:
throw new NotImplementedException();
}
return(hash);
}