SwapStreams.jl
From the documentation of read(io::IO, T) in the Base Julia library...
Note that Julia does not convert the endianness for you. Use
ntohor `ltoh for this purpose.
...but SwapStreams does!
SwapStreams exports a simple type (SwapStream) that wraps any I/O stream.
Once constructed, a SwapStream will byte swap any read/write operation if appropriate.
julia> using SwapStreams
julia> s = SwapStream(IOBuffer()); # assume byte swapping is necessary
julia> write(s, [1:10...]); # byte swap each element before writing to buffer
julia> seek(s, 0);
julia> read!(s.io, Vector{Int}(undef, 10)) # raw data from buffer
10-element Vector{Int64}:
72057594037927936
144115188075855872
216172782113783808
288230376151711744
360287970189639680
432345564227567616
504403158265495552
576460752303423488
648518346341351424
720575940379279360
julia> seek(s, 0);
julia> read!(s, Vector{Int}(undef, 10)) # byte swapped data from buffer
10-element Vector{Int64}:
1
2
3
4
5
6
7
8
9
10
One can directly tell a SwapStream to byte swap or not by specifying true or false at the time of its construction.
Alternatively, one may specify whether the stream is big or little endian with the exported constants BigEndian and LittleEndian.
julia> using SwapStreams
julia> io = IOBuffer();
julia> SwapStream(true, io) == SwapStream(io) # does byte swap
true
julia> SwapStream(false, io) == # explicitly do not byte swap
SwapStream(ifelse(ENDIAN_BOM == BigEndian, BigEndian, LittleEndian), io) # since stream has same endian type as system no swap
trueNote that we set the stream's endianness to the same as the system's so that it wouldn't perform byte swapping.