private static FileDatabaseManifest DeserializeManifest(
byte[] encryptedBytes,
Config config
)
{
using (MemoryStream deserializedMemoryStream = new MemoryStream())
{
using (MemoryStream compressedBytesStream = new MemoryStream(EncryptionHelpers.DecryptBytes(encryptedBytes, config.EncryptionKey, config.InitializationVector)))
using (GZipStream decompressionStream = new GZipStream(compressedBytesStream, CompressionMode.Decompress))
{
decompressionStream.CopyTo(deserializedMemoryStream);
}
return(JsonConvert.DeserializeObject <FileDatabaseManifest>(
Encoding.UTF8.GetString(deserializedMemoryStream.ToArray())
));
}
}
private void ReconstructFile(
string destination,
IEnumerable <Tuple <string, long> > localFileShardIDPathsAndIndices
)
{
long currentShard = 0;
using (FileStream outputFileStream = System.IO.File.Create(destination))
{
this.Info("Piecing file together");
foreach (string fileShardPath in localFileShardIDPathsAndIndices.OrderBy(t => t.Item2).Select(t => t.Item1))
{
this.Verbose($"Adding shard: {currentShard}");
// Load the bytes into memory
byte[] decryptedBytes = EncryptionHelpers.DecryptBytes(
System.IO.File.ReadAllBytes(fileShardPath),
_config.EncryptionKey,
_config.InitializationVector
);
// Load the string
FileShard deserializedFileShard =
JsonConvert.DeserializeObject <FileShard>(
Encoding.UTF8.GetString(decryptedBytes, 0, decryptedBytes.Length)
);
// Assert that the current shard equals the one we expect
if (deserializedFileShard.PieceNumber != currentShard)
{
throw new InvalidOperationException("The file shard IDs are out of order!");
}
outputFileStream.Write(deserializedFileShard.Payload, 0, deserializedFileShard.Payload.Length);
currentShard++;
System.IO.File.Delete(fileShardPath);
}
}
}