Provides functions to decode, encode and work with ASN.1 BER-TLV structures. It supports tags encoded on multiple bytes, length encoded on multiple bytes, indefinite length and both primitive and constructed TLVs.
Add tlv to your list of dependencies in mix.exs:
def deps do
[{:tlv, "~> 0.2.0"}]
end# Primitive TLV + data after its end
iex> TLV.decode(<<0x80, 0x02, 0xCA, 0xFE, 0xAA, 0xBB>>)
{%TLV{indefinite_length: false, tag: 0x80, value: <<0xCA, 0xFE>>}, <<0xAA, 0xBB>>}
# Constructed TLV
iex> TLV.decode(<<0xE0, 0x03, 0x80, 0x01, 0xAA>>)
{%TLV{indefinite_length: false, tag: 0xE0, value:
[%TLV{indefinite_length: false, tag: 0x80, value: <<0xAA>>}]
}, ""}
# Malformed TLV
iex> TLV.decode(<<0x80, 0x02, 0x00>>)
:no_tlv# Primitive TLV
iex> TLV.encode(%TLV{tag: 0x80, value: <<0xAA, 0xBB>>})
<<0x80, 0x02, 0xAA, 0xBB>>
# Constructed TLV
iex> TLV.encode(%TLV{tag: 0xE0, value: [%TLV{tag: 0x80, value: <<0xAA>>}]})
<<0xE0, 0x03, 0x80, 0x01, 0xAA>>