async UniTask <bool> ReadFileAsync(IAltoStorageData data)
{
string path = $"{ DataPath() }/{ SlotPrefix() }{ data.SaveFileName() }";
Log($"Read file : {path}");
if (!File.Exists(path))
{
Log($"File not exists, so set initial data : { data.GetType() }");
data.OnCreateNewData();
return(false);
}
try
{
byte[] dataBytes;
byte[] ivSeedBytes = new byte[IvSeedLength];
using (var fileStream = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Read))
{
dataBytes = new byte[fileStream.Length - IvSeedLength];
await fileStream.ReadAsync(ivSeedBytes, 0, IvSeedLength);
await fileStream.ReadAsync(dataBytes, 0, dataBytes.Length);
}
string ivSeed = Encoding.UTF8.GetString(ivSeedBytes);
dataBytes = AltoCrypto.Decrypt(dataBytes, CryptoKey(), ivSeed);
string json = Encoding.UTF8.GetString(dataBytes);
data.OnDeserialize(json);
data.ClearDirty();
MigrateIfNeeded(data);
return(true);
}
catch (Exception e)
{
Debug.LogException(e);
return(false);
}
}
async UniTask <bool> WriteFileAsync(IAltoStorageData data, bool useDirtyCache = false)
{
try
{
string json = JsonUtility.ToJson(data);
byte[] dataBytes = Encoding.UTF8.GetBytes(json);
string ivSeed = IdUtil.GetGuidAs22Chars();
dataBytes = AltoCrypto.Encrypt(dataBytes, CryptoKey(), ivSeed);
byte[] ivSeedBytes = Encoding.UTF8.GetBytes(ivSeed);
string path = $"{ DataPath() }/{ SlotPrefix() }{ data.SaveFileName() }";
string tmpPath = path + ".tmp";
using (var fileStream = new FileStream(tmpPath, FileMode.Create, FileAccess.Write, FileShare.Read))
{
await fileStream.WriteAsync(ivSeedBytes, 0, ivSeedBytes.Length);
await fileStream.WriteAsync(dataBytes, 0, dataBytes.Length);
fileStream.Flush(flushToDisk: true);
}
if (File.Exists(path))
{
File.Delete(path);
}
File.Move(tmpPath, path);
data.ClearDirty(useDirtyCache);
return(true);
}
catch (Exception e)
{
Debug.LogException(e);
return(false);
}
}