function uncompress()

in src/table.jl [760:789]

• 27 lines of code
• 6 McCabe index (conditional complexity)

function uncompress(ptr::Ptr{UInt8}, buffer, compression)
    buffer.length == 0 && return 0, UInt8[]
    len = unsafe_load(convert(Ptr{Int64}, ptr))
    len == 0 && return 0, UInt8[]
    ptr += 8 
    encodedbytes = unsafe_wrap(Array, ptr, buffer.length - 8)
    if len == -1
        
        
        
        return length(encodedbytes), copy(encodedbytes)
    end
    decodedbytes = Vector{UInt8}(undef, len)
    if compression.codec === Meta.CompressionType.LZ4_FRAME
        comp = lz4_frame_decompressor()
        Base.@lock comp begin
            transcode(comp[], encodedbytes, decodedbytes)
        end
    elseif compression.codec === Meta.CompressionType.ZSTD
        comp = zstd_decompressor()
        Base.@lock comp begin
            transcode(comp[], encodedbytes, decodedbytes)
        end
    else
        error(
            "unsupported compression type when reading arrow buffers: $(typeof(compression.codec))",
        )
    end
    return len, decodedbytes
end