internal async Task GenerateChecksumsAsync(CancellationTokenSource tokenSource)
{
try
{
Log($"{nameof(TreeChecksumViewModel)}.{nameof(GenerateChecksumsAsync)}: Start");
IHashAlgorithim algorithim = HashAlgorithimFactory.Get(SelectedAlgorithim);
Hasher hasher = new Hasher(algorithim);
m_CancellationTokenSource = tokenSource;
CancellationToken token = tokenSource.Token;
token.ThrowIfCancellationRequested();
m_GenerationInProgress = true;
foreach (DirectoryItem childNode in RootNode.Items)
{
await GenerateChecksumAsync(childNode, hasher, token);
}
}
finally
{
Log($"{nameof(TreeChecksumViewModel)}.{nameof(GenerateChecksumsAsync)}: End");
m_GenerationInProgress = false;
m_CancellationTokenSource.Dispose();
}
}
private static IHashAlgorithim GetAlgorithim(string flag)
{
if (string.IsNullOrWhiteSpace(flag))
{
throw new ArgumentException($"The checksum algorithim flag is empty/null.");
}
Enumerations.ChecksumAlgorithim algorithim = Enumerations.ChecksumAlgorithim.None;
if (flag.Equals(m_Algorithim_Md5, StringComparison.OrdinalIgnoreCase))
{
Log("Algorithim is MD5.");
algorithim = Enumerations.ChecksumAlgorithim.MD5;
}
else if (flag.Equals(m_Algorithim_Sha_1, StringComparison.OrdinalIgnoreCase))
{
Log("Algorithim is SHA-1.");
algorithim = Enumerations.ChecksumAlgorithim.SHA1;
}
else if (flag.Equals(m_Algorithim_Sha_256, StringComparison.OrdinalIgnoreCase))
{
Log("Algorithim is SHA-256.");
algorithim = Enumerations.ChecksumAlgorithim.SHA256;
}
else if (flag.Equals(m_Algorithim_Sha_384, StringComparison.OrdinalIgnoreCase))
{
Log("Algorithim is SHA384.");
algorithim = Enumerations.ChecksumAlgorithim.SHA384;
}
else if (flag.Equals(m_Algorithim_Sha_512, StringComparison.OrdinalIgnoreCase))
{
Log("Algorithim is SHA-512.");
algorithim = Enumerations.ChecksumAlgorithim.SHA512;
}
else
{
throw new ArgumentException($"The checksum algorithim flag is unhandled: \"{flag}\".");
}
return(HashAlgorithimFactory.Get(algorithim));
}
internal async Task ComputeChecksumAsync()
{
Log($"{nameof(FileChecksumViewModel)}.{nameof(ComputeChecksumAsync)}: Start");
IHashAlgorithim algorithim = HashAlgorithimFactory.Get(SelectedAlgorithim);
Hasher hasher = new Hasher(algorithim);
string checksum = string.Empty;
bool?result = await Task.Run(() => hasher.TryGetFileChecksum(SelectedItem.FullyQualifiedFilename, out checksum));
if (result.HasValue &&
result.Value)
{
ComputedChecksum = checksum;
}
else
{
Log($" There was no result from the hashing.");
}
Log($"{nameof(FileChecksumViewModel)}.{nameof(ComputeChecksumAsync)}: End");
}
