Specs

count_ones(integer()) :: integer()

Returns the number of 1s in binary representation of the given integer.

Example

iex> Bitcraft.count_ones(15)
4

iex> Bitcraft.count_ones(255)
8

Specs

decode_segment(bitstring(), Keyword.t()) ::
  {codable_segment_type(), bitstring()}

Returns a tuple {decoded value, leftover} where the first element is the decoded value from the given input (according to the given otps too) and the second element is the leftover.

Options

• :size - The size in bits to decode. Defaults to byte_size(input) * 8. If the type is Bitcraft.BitBlock.Array.(), the size should match with array_length * element_size.

• :type - The segment type given by Bitcraft.segment_type(). Defaults to :integer.

• :sign - If the input is an integer, defines if it is :signed or :unsigned. Defaults to :unsigned.

• :endian - Applies to utf32, utf16, float, integer. Defines the endianness, :big or :little. Defaults to :big.

Example

iex> 3
...> |> Bitcraft.encode_segment(size: 4)
...> |> Bitcraft.decode_segment(size: 4)
{3, ""}

iex> -3.3
...> |> Bitcraft.encode_segment(size: 64, type: :float, sign: :signed)
...> |> Bitcraft.decode_segment(size: 64, type: :float, sign: :signed)
{-3.3, ""}

iex> "test"
...> |> Bitcraft.encode_segment(type: :binary)
...> |> Bitcraft.decode_segment(size: 4, type: :binary)
{"test", ""}

iex> <<1, 2, 3, 4>>
...> |> Bitcraft.encode_segment(type: :bits)
...> |> Bitcraft.decode_segment(size: 32, type: :bits)
{<<1, 2, 3, 4>>, ""}

iex> alias Bitcraft.BitBlock.Array
iex> [1, 2]
...> |> Bitcraft.encode_segment(type: %Array{})
...> |> Bitcraft.decode_segment(size: 16, type: %Array{})
{[1, 2], ""}
iex> [3.3, -7.7, 9.9]
...> |> Bitcraft.encode_segment(
...>   type: %Array{type: :float, element_size: 64},
...>   sign: :signed
...> )
...> |> Bitcraft.decode_segment(
...>   size: 192,
...>   type: %Array{type: :float, element_size: 64},
...>   sign: :signed
...> )
{[3.3, -7.7, 9.9], ""}

Specs

encode_segment(codable_segment_type(), Keyword.t()) :: bitstring()

Encodes the given input into a bitstring.

Options

• :size - The size in bits for the input to encode. The default value depend on the type, for integer is 8, for float is 63, and for other data types is nil. If the input is a list, this option is skipped, since it is handled as array and the size will be array_length * element_size.

• :type - The segment type given by Bitcraft.segment_type(). Defaults to :integer.

• :sign - If the input is an integer, defines if it is :signed or :unsigned. Defaults to :unsigned.

• :endian - Applies to utf32, utf16, float, integer. Defines the endianness, :big or :little. Defaults to :big.

Example

iex> Bitcraft.encode_segment(15)
<<15>>

iex> Bitcraft.encode_segment(255, size: 4)
<<15::size(4)>>

iex> Bitcraft.encode_segment(-3.3, size: 64, type: :float)
<<192, 10, 102, 102, 102, 102, 102, 102>>

iex> Bitcraft.encode_segment("hello", type: :binary)
"hello"

iex> Bitcraft.encode_segment(<<1, 2, 3>>, type: :bits)
<<1, 2, 3>>

iex> Bitcraft.encode_segment([1, -2, 3], type: %Bitcraft.BitBlock.Array{
...>   type: :integer, element_size: 4},
...>   sign: :signed
...> )
<<30, 3::size(4)>>