/
byte_format.cr
156 lines (137 loc) · 4.82 KB
/
byte_format.cr
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# Defines a byte format to encode integers and floats
# from/to `Bytes` and `IO`.
#
# ### Decode from bytes
#
# ```
# bytes = Bytes[0x34, 0x12]
# int16 = IO::ByteFormat::LittleEndian.decode(Int16, bytes)
# int16 # => 0x1234_i16
# ```
#
# ### Decode from an IO
#
# ```
# io = IO::Memory.new(Bytes[0x34, 0x12])
# int16 = io.read_bytes(Int16, IO::ByteFormat::LittleEndian)
# int16 # => 0x1234_i16
# ```
#
# ### Encode to bytes
#
# ```
# raw = uninitialized UInt8[2]
# IO::ByteFormat::LittleEndian.encode(0x1234_i16, raw.to_slice)
# raw # => StaticArray[0x34, 0x12]
# ```
#
# ### Encode to IO
#
# ```
# io = IO::Memory.new
# io.write_bytes(0x1234_i16, IO::ByteFormat::LittleEndian)
# io.to_slice # => Bytes[0x34, 0x12]
# ```
module IO::ByteFormat
abstract def encode(int : Int8, io : IO)
abstract def encode(int : UInt8, io : IO)
abstract def encode(int : Int16, io : IO)
abstract def encode(int : UInt16, io : IO)
abstract def encode(int : Int32, io : IO)
abstract def encode(int : UInt32, io : IO)
abstract def encode(int : Int64, io : IO)
abstract def encode(int : UInt64, io : IO)
abstract def encode(int : Int128, io : IO)
abstract def encode(int : UInt128, io : IO)
abstract def encode(int : Int8, bytes : Bytes)
abstract def encode(int : UInt8, bytes : Bytes)
abstract def encode(int : Int16, bytes : Bytes)
abstract def encode(int : UInt16, bytes : Bytes)
abstract def encode(int : Int32, bytes : Bytes)
abstract def encode(int : UInt32, bytes : Bytes)
abstract def encode(int : Int64, bytes : Bytes)
abstract def encode(int : UInt64, bytes : Bytes)
abstract def encode(int : Int128, bytes : Bytes)
abstract def encode(int : UInt128, bytes : Bytes)
abstract def decode(int : Int8.class, io : IO)
abstract def decode(int : UInt8.class, io : IO)
abstract def decode(int : Int16.class, io : IO)
abstract def decode(int : UInt16.class, io : IO)
abstract def decode(int : Int32.class, io : IO)
abstract def decode(int : UInt32.class, io : IO)
abstract def decode(int : Int64.class, io : IO)
abstract def decode(int : UInt64.class, io : IO)
abstract def decode(int : Int128.class, io : IO)
abstract def decode(int : UInt128.class, io : IO)
abstract def decode(int : Int8.class, bytes : Bytes)
abstract def decode(int : UInt8.class, bytes : Bytes)
abstract def decode(int : Int16.class, bytes : Bytes)
abstract def decode(int : UInt16.class, bytes : Bytes)
abstract def decode(int : Int32.class, bytes : Bytes)
abstract def decode(int : UInt32.class, bytes : Bytes)
abstract def decode(int : Int64.class, bytes : Bytes)
abstract def decode(int : UInt64.class, bytes : Bytes)
abstract def decode(int : Int128.class, bytes : Bytes)
abstract def decode(int : UInt128.class, bytes : Bytes)
def encode(float : Float32, io : IO)
encode(float.unsafe_as(Int32), io)
end
def encode(float : Float32, bytes : Bytes)
encode(float.unsafe_as(Int32), bytes)
end
def decode(type : Float32.class, io : IO)
decode(Int32, io).unsafe_as(Float32)
end
def decode(type : Float32.class, bytes : Bytes)
decode(Int32, bytes).unsafe_as(Float32)
end
def encode(float : Float64, io : IO)
encode(float.unsafe_as(Int64), io)
end
def encode(float : Float64, bytes : Bytes)
encode(float.unsafe_as(Int64), bytes)
end
def decode(type : Float64.class, io : IO)
decode(Int64, io).unsafe_as(Float64)
end
def decode(type : Float64.class, bytes : Bytes)
decode(Int64, bytes).unsafe_as(Float64)
end
module LittleEndian
extend ByteFormat
end
module BigEndian
extend ByteFormat
end
alias SystemEndian = LittleEndian
alias NetworkEndian = BigEndian
{% for mod in %w(LittleEndian BigEndian) %}
module {{mod.id}}
{% for type, i in %w(Int8 UInt8 Int16 UInt16 Int32 UInt32 Int64 UInt64 Int128 UInt128) %}
{% bytesize = 2 ** (i // 2) %}
def self.encode(int : {{type.id}}, io : IO)
buffer = int.unsafe_as(StaticArray(UInt8, {{bytesize}}))
buffer.reverse! unless SystemEndian == self
io.write(buffer.to_slice)
end
def self.encode(int : {{type.id}}, bytes : Bytes)
buffer = int.unsafe_as(StaticArray(UInt8, {{bytesize}}))
buffer.reverse! unless SystemEndian == self
buffer.to_slice.copy_to(bytes)
end
def self.decode(type : {{type.id}}.class, io : IO)
buffer = uninitialized UInt8[{{bytesize}}]
io.read_fully(buffer.to_slice)
buffer.reverse! unless SystemEndian == self
buffer.unsafe_as({{type.id}})
end
def self.decode(type : {{type.id}}.class, bytes : Bytes)
buffer = uninitialized UInt8[{{bytesize}}]
bytes.to_slice[0, {{bytesize}}].copy_to(buffer.to_slice)
buffer.reverse! unless SystemEndian == self
buffer.unsafe_as({{type.id}})
end
{% end %}
end
{% end %}
end