public static Stream CreateStream(ES3Settings settings, ES3FileMode fileMode)
{
bool isWriteStream = (fileMode != ES3FileMode.Read);
Stream stream = null;
if (settings.location == ES3.Location.Memory)
{
// There's no point in creating an empty MemoryStream if we're only reading from it.
if (!isWriteStream)
{
return(null);
}
stream = new MemoryStream(settings.bufferSize);
}
else if (settings.location == ES3.Location.File)
{
if (!isWriteStream && !ES3IO.FileExists(settings.FullPath))
{
return(null);
}
stream = new ES3FileStream(settings.FullPath, fileMode, settings.bufferSize, false);
}
else if (settings.location == ES3.Location.PlayerPrefs)
{
if (isWriteStream)
{
stream = new ES3PlayerPrefsStream(settings.FullPath, settings.bufferSize, (fileMode == ES3FileMode.Append));
}
else
{
if (!PlayerPrefs.HasKey(settings.FullPath))
{
return(null);
}
stream = new ES3PlayerPrefsStream(settings.FullPath);
}
}
else if (settings.location == ES3.Location.Resources)
{
if (!isWriteStream)
{
var resourcesStream = new ES3ResourcesStream(settings.FullPath);
if (resourcesStream.Exists)
{
stream = resourcesStream;
}
else
{
resourcesStream.Dispose();
return(null);
}
}
else if (UnityEngine.Application.isEditor)
{
throw new System.NotSupportedException("Cannot write directly to Resources folder. Try writing to a directory outside of Resources, and then manually move the file there.");
}
else
{
throw new System.NotSupportedException("Cannot write to Resources folder at runtime. Use a different save location at runtime instead.");
}
}
#if !DISABLE_ENCRYPTION
if (settings.encryptionType != ES3.EncryptionType.None)
{
EncryptionAlgorithm alg = null;
if (settings.encryptionType == ES3.EncryptionType.AES)
{
alg = new AESEncryptionAlgorithm();
}
stream = new UnbufferedCryptoStream(stream, !isWriteStream, settings.encryptionPassword, settings.bufferSize, alg);
}
#endif
return(stream);
}
public UnbufferedCryptoStream(Stream stream, bool isReadStream, string password, int bufferSize, EncryptionAlgorithm alg) : base()
{
this.stream = stream;
this.isReadStream = isReadStream;
this.password = password;
this.bufferSize = bufferSize;
this.alg = alg;
if (isReadStream)
{
alg.Decrypt(stream, this, password, bufferSize);
}
}
