You are given a code snippet that defines a namespace `BinaryRecords.Extensions` and a static class `BufferExtensions`. Your task is to complete the implementation of the `BufferExtensions` class by adding a method called `ReadBytes` that reads a specified number of bytes from a buffer.

The `ReadBytes` method should have the following signature:
```csharp
public static byte[] ReadBytes(byte[] buffer, int count)
```

You need to implement the `ReadBytes` method in a way that it returns an array of bytes with a length equal to the value of `count`. The method should read bytes from the `buffer` starting from the beginning and stop when `count` number of bytes have been read. If the `count` is greater than the available number of bytes in the `buffer`, the method should return only the available bytes.

For example, given the following `buffer` and `count`:
```csharp
byte[] buffer = { 65, 66, 67, 68, 69, 70 };
int count = 4;
```
The `ReadBytes` method should return `{ 65, 66, 67, 68 }` since it reads the first 4 bytes from the `buffer`. If the `count` is greater than the available bytes in the `buffer`, the method should return all the bytes in the `buffer`. 

Write the code for the `ReadBytes` method.
user
Certainly, I can help you complete the `ReadBytes` method implementation in the `BinaryRecords.Extensions` namespace with the given signature. Here's how you can implement it:

```csharp
namespace BinaryRecords.Extensions
{
    public static class BufferExtensions
    {
        public static byte[] ReadBytes(this byte[] buffer, int count)
        {
            if (buffer == null)
            {
                throw new ArgumentNullException(nameof(buffer));
            }

            if (count <= 0)
            {
                throw new ArgumentOutOfRangeException(nameof(count), "Count should be greater than zero.");
            }

            if (count > buffer.Length)
            {
                return buffer;
            }

            byte[] result = new byte[count];

            Array.Copy(buffer, 0, result, 0, Math.Min(count, buffer.Length));

            return result;
        }
    }
}
```

Explanation:
- The `this byte[] buffer` parameter is a way to make this method available as an extension method for the `byte[]` type.
- The first `if` statement checks if the buffer object is `null`. If it is, an `ArgumentNullException` is thrown.
- The second `if` statement checks if the `count` is less than or equal to zero. This ensures that the method won't return an empty byte array or a byte array with a length that's not greater than zero. If it's zero or negative, it throws an `ArgumentOutOfRangeException` with a custom error message.
- The third `if` statement checks if the `count` is greater than the length of the buffer. This case, it doesn't read more than buffer.length. If this occurs, it returns the entire buffer as it is.
- The `result` byte array is a new byte array instance initialized with the count. It's copied into using `Array.copy`, which can mandate the length.
- The fourth `if` statement ensures that the copy length isn't greater than the byte array's lengths.
- Finally, the byte array is returned.

You can call this method using the following way:

```csharp
byte[] buffer = { 65, 66, 67, 68, 69, 70 };
int count = 4;
byte[] result = buffer.ReadBytes(count);
```
assistant
You are given a code snippet that defines a namespace `BinaryRecords.Extensions` and a static class `BufferExtensions`. Your task is to complete the implementation of the `BufferExtensions` class by adding a method called `ReadBytes` that reads a specified number of bytes from a buffer.

The `ReadBytes` method should have the following signature:
```csharp
public static byte[] ReadBytes(byte[] buffer, int count)
```

You need to implement the `ReadBytes` method in a way that it returns an array of bytes with a length equal to the value of `count`. The method should read bytes from the `buffer` starting from the beginning and stop when `count` number of bytes have been read. If the `count` is greater than the available number of bytes in the `buffer`, the method should return only the available bytes.

For example, given the following `buffer` and `count`:
```csharp
byte[] buffer = { 65, 66, 67, 68, 69, 70 };
int count = 4;
```
The `ReadBytes` method should return `{ 65, 66, 67, 68 }` since it reads the first 4 bytes from the `buffer`. If the `count` is greater than the available bytes in the `buffer`, the method should return all the bytes in the `buffer`. 

Write the code for the `ReadBytes` method.
user
Sure, here is the implementation of the `ReadBytes` method:

```csharp
namespace BinaryRecords.Extensions
{
    public static class BufferExtensions
    {
        public static byte[] ReadBytes(this byte[] buffer, int count)
        {
            if (buffer == null || buffer.Length == 0)
                return new byte[0];

            count = Math.Min(count, buffer.Length);
            byte[] result = new byte[count];
            Array.Copy(buffer, result, count);
            return result;
        }
    }
}
```
This method first checks if the buffer is null or empty, and if so, it returns an empty byte array. Then it calculates the actual number of bytes to read, which is the minimum of `count` and the length of the buffer. It creates a new byte array of this size, copies the required number of bytes from the buffer to this new array, and finally returns the new array.
assistant