private HashAlgorithm CreateHashAlgorithm(FileHashAlgorithm hashAlgorithm)
{
switch (hashAlgorithm)
{
case FileHashAlgorithm.MD5:
return(MD5.Create());
case FileHashAlgorithm.SHA1:
return(SHA1.Create());
case FileHashAlgorithm.SHA256:
return(SHA256.Create());
case FileHashAlgorithm.SHA384:
return(SHA384.Create());
case FileHashAlgorithm.SHA512:
return(SHA512.Create());
case FileHashAlgorithm.CRC32:
return(new Crc32Algorithm());
default:
throw new ArgumentOutOfRangeException(nameof(hashAlgorithm), hashAlgorithm, null);
}
}
public Task <byte[]> ComputeAsync(string path, FileHashAlgorithm hashAlgorithm)
{
try
{
using (var fileStream = System.IO.File.OpenRead(path))
using (var progressingStream = new ProgressingReadStream(fileStream, OnProgressChanged))
using (var hash = CreateHashAlgorithm(hashAlgorithm))
using (_cancellationTokenSource.Token.Register(() => fileStream.Dispose()))
{
var result = hash.ComputeHash(progressingStream);
return(Task.FromResult(result));
}
}
catch (Exception) when(_cancellationTokenSource.IsCancellationRequested)
{
return(null);
}
}
public static HashAlgorithm CreateHashAlgorithm(this FileHashAlgorithm algorithm)
{
switch (algorithm)
{
case FileHashAlgorithm.SHA256:
return(SHA256.Create());
case FileHashAlgorithm.SHA512:
return(SHA512.Create());
case FileHashAlgorithm.SHA1:
return(SHA1.Create());
case FileHashAlgorithm.MD5:
return(MD5.Create());
case FileHashAlgorithm.CRC32:
return(new Crc32Algorithm());
default:
throw new ArgumentOutOfRangeException();
}
}
public ComputeHashViewModel(string path, FileHashAlgorithm hashAlgorithm, ITargetedRestClient restClient)
{
_path = path;
HashAlgorithm = hashAlgorithm;
_restClient = restClient;
}
