/// <summary>
/// Loads the data for the specified identifier using the specified serializable data inteface object.
/// </summary>
/// <param name="serializableData">The serializable data.</param>
/// <param name="id">The identifier.</param>
private static byte[] Load(ISerializableData serializableData, string id)
{
byte[] data = serializableData.LoadData(id);
if (data == null)
{
Log.Debug(typeof(BinaryData), "Load", id, "-");
return(null);
}
Log.Debug(typeof(BinaryData), "Load", id, data.Length);
if (data.Length > 0)
{
if (data.Length < 2)
{
throw new InvalidOperationException("Serialized data corruption");
}
if (!FletcherChecksum.Validate(data, 0, data.Length))
{
throw new InvalidOperationException("Serialized data corruption");
}
Array.Resize(ref data, data.Length - 2);
}
return(data);
}
/// <summary>
/// Checks a local checksum using error-correction check-bytes.
/// </summary>
/// <returns>True if the checksum is valid.</returns>
public void CheckLocalCheckSum()
{
this.AssureLeft(2);
this.index += 2;
if (!FletcherChecksum.Validate(this.serializedData, this.localCheckSumIndex, this.index))
{
this.DeserializationError = true;
throw new InvalidOperationException("Serialized data corruption!");
}
}
/// <summary>
/// Adds a local checksum to the data.
/// </summary>
public void AddLocalCheckSum()
{
this.AssureSize(this.index + 2);
FletcherChecksum.ControlBytes control = FletcherChecksum.GetControlBytes(this.serializedData, this.localCheckSumIndex, this.index);
this.serializedData[this.index] = control.First;
this.serializedData[this.index + 1] = control.Second;
this.index += 2;
this.localCheckSumIndex = this.index;
}
/// <summary>
/// Saves the serialized data.
/// </summary>
/// <param name="serializableData">The serializable data inteface object.</param>
/// <param name="id">The identifier.</param>
public void Save(ISerializableData serializableData, string id)
{
if (!this.isWriteable)
{
throw new InvalidOperationException("Container is readonly");
}
if (this.serializedData != null)
{
FletcherChecksum.ControlBytes control = FletcherChecksum.GetControlBytes(this.serializedData, 0, this.index);
byte[] data = new byte[this.index + 2];
if (this.index > 0)
{
Buffer.BlockCopy(this.serializedData, 0, data, 0, this.index);
}
data[this.index] = control.First;
data[this.index + 1] = control.Second;
Log.Debug(this, "Save", id, data.Length);
serializableData.SaveData(id, data);
}
}
