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A Buffer class that makes it easy to slice, concat, copy, etc.

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# SYNOPSIS
A Buffer class.

# USAGE
This module is designed to work with the [`datcxx`][0] build tool. To add this
module to your project us the following command...

```bash
build add datcxx/buffer
```

# TEST

```bash
build test
```

# EXAMPLE

```c++
Buffer<uint8_t> a(128);
Buffer<uint8_t> b = { 0x00, 0xFF };

auto c = a.concat(b);
```

# API

## CONSTRUCTOR
The `Buffer` constructor overloads `operator<<` so that it can be easily
piped to `std` streams ie `std::cout`.

```c++
Buffer<T> b;
```

```c++
Buffer<T> b(size_t size);
```

```c++
Buffer<T> b = { 0x00, 0x00 };
```

```c++
Buffer<T> b({ 0x00, 0x00 });
```

```c++
Buffer<T> b(anotherBuffer);
```

## METHODS

### length()
Returns an `integer`, the amount of memory allocated for buf in bytes. Note that
this does not necessarily reflect the amount of "usable" data within buf.

#### EXAMPLE
```c++
Buffer<uint8_t> b = { 0x00, 0x00 };
b.length(); // 2
```

### toString()
Returns a `std::string` version of the buffer's value.

### toString(const std::string encoding, size_t start, size_t end)
Returns an encoded `std::String` (at optionally specified start and end).

| Type        | Parameter   | Default Value | Optional | Description                                                      |
| ----------- | ----------- | ------------- | -------- | ---------------------------------------------------------------- |
| std::string | encoding    |               | No       | Encoding, currently supports either "base64" or "hex".           |
| size_t      | start       | 0             | Yes      | The offset within buf from which to begin the slice.             |
| size_t      | end         | buf.length()  | Yes      | The offset within buf at which to stop the slice.                |

#### EXAMPLE
```c++
Buffer<uint8_t> b("Hello, world!");
b.toString("base64"); // "SGVsbG8sIHdvcmxkIQ=="
```

### copy(target[, targetStart[, sourceStart[, sourceEnd]]]
Returns an `integer`, the number of bytes copied.

| Type   | Parameter   | Default Value | Optional | Description                                                      |
| ------ | ----------- | ------------- | -------- | ---------------------------------------------------------------- |
| Buffer | target      |               | No       | A Buffer to copy into.                                           |
| size_t | targetStart | 0             | Yes      | The offset within target at which to begin writing.              |
| size_t | sourceStart | 0             | Yes      | The offset within buf from which to begin copying.               |
| size_t | sourceEnd   | buf.length()  | Yes      | The offset within buf at which to stop. copying (not inclusive). |

#### EXAMPLE
```c++
Buffer<uint8_t> a({ 01, 02, 03, 04, 05, 06, 07, 0xFF });
Buffer<uint8_t> b({ 00, 00, 00, 00, 00, 00 });
a.copy(b, 3, 2);

// a == <Buffer 01 02 03 04 05 06 07 ff>
// b == <Buffer 00 00 00 03 04 05>
```

### concat([buffer[, ...]])
Returns a new Buffer, the result of concatenating a list of Buffer instances.

#### EXAMPLE
```c++
Buffer<uint8_t> a({ 0x01, 0x02 });
Buffer<uint8_t> b({ 0x03, 0x04 });
Buffer<uint8_t> c({ 0x05, 0x06 });

auto d = a.concat({ b, c });

// d == <Buffer 01 02 03 04 05 06>
```

### equals(buffer)
To compare two buffers you can use the `==` and `!=` operators. Each
element in the buffer will be compared, if all are equal the result is `true`.

#### EXAMPLE
```c++
Buffer<uint8_t> b({ 0x03, 0x04 });
Buffer<uint8_t> c({ 0x05, 0x06 });

b != c; // true
```

### slice(start[, end])
Returns a new instance of Buffer that references the same memory as the
original, but offset and cropped by the start and end indices.

| Type   | Parameter | Default Value | Optional | Description                                    |
| ------ | --------- | ------------- | -------- | ---------------------------------------------- |
| size_t | start     | 0             | No       | Where the new Buffer will start.               |
| size_t | end       | buf.length()  | Yes      | Where the new Buffer will end (not inclusive). |

#### EXAMPLE
```c++
Buffer<uint8_t> b({ 0x01, 0x02, 0x03, 0x04 });

auto slice = b.slice(2, 4); // <Buffer 03 04>
```

[0]:https://github.com/datcxx/build

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