# ReadPackedLong(in StreamCompressionModel)

> Reads an 8-byte signed long value from the data stream using a StreamCompressionModel. Negative values de-interleaves from positive values before returning, for example (0, -1, 1, -2, 2) -> (-2, -1, 0, 1, 2)

## Definition

* **Type:** Method
* **Namespace:** [Unity.Collections](/engine/6000.7/script-reference/unity/collections.md)
* **Assembly:** UnityEngine.ManagedKernelModule

## ReadPackedLong(StreamCompressionModel)

```csharp
public long ReadPackedLong(in StreamCompressionModel model)
```

### Parameters

**** (\[StreamCompressionModel]\(/engine/6000.7/script-reference/unity/collections/streamcompressionmodel)): [StreamCompressionModel](/engine/6000.7/script-reference/unity/collections/streamcompressionmodel.md) model for reading value in a packed manner.

### Returns

| Type                                                        | Description                                                                                         |
| ----------------------------------------------------------- | --------------------------------------------------------------------------------------------------- |
| [long](https://learn.microsoft.com/dotnet/api/system.int64) | An 8-byte signed long read from the current stream, or 0 if the end of the stream has been reached. |