/// <summary>
/// Set possibly file extension properties from a FileInfo object:
/// - size
/// - checksum
/// </summary>
/// <returns></returns>
public static async Task SetFileExtensionProperties(this FileStacExtension fileStacExtension,
Stream stream,
HashType hashType = HashType.SHA1,
MultibaseEncoding encoding = MultibaseEncoding.Base16Lower)
{
await fileStacExtension.SetFileCheckSum(hashType, encoding, uri => stream);
}
/// <summary>
/// Set possibly file extension properties from a FileInfo object:
/// - size
/// - checksum
/// </summary>
/// <returns></returns>
public static async Task SetFileExtensionProperties(this FileStacExtension fileStacExtension,
FileInfo file,
HashType hashType = HashType.SHA1,
MultibaseEncoding encoding = MultibaseEncoding.Base16Lower)
{
fileStacExtension.Size = Convert.ToUInt64(file.Length);
await fileStacExtension.SetFileCheckSum(hashType, encoding, uri => file.OpenRead());
}
/// <summary>
/// Add the checksum property of the file extension
/// </summary>
/// <returns></returns>
public static async Task SetFileCheckSum(this FileStacExtension fileStacExtension,
HashType hashType,
MultibaseEncoding encoding,
Func <Uri, Stream> uriStreamer)
{
Multihash mh = null;
using (var stream = uriStreamer(fileStacExtension.StacAsset.Uri))
{
byte[] data = null;
using (var mem = new MemoryStream())
{
await stream.CopyToAsync(mem);
data = mem.ToArray();
fileStacExtension.Size = Convert.ToUInt64(mem.Length);
}
mh = Multihash.Sum(hashType, data);
}
fileStacExtension.Checksum = mh;
}
