Chunk padding not recognized about wav.jl HOT 3 CLOSED

function wavread(io::IO; subrange=(:), format="double")
    chunk_size = read_header(io)
    samples = Array{Float64, 1}()
    nbits = 0
    sample_rate = Float32(0.0)
    opt = WAVChunk[]

    # Subtract the size of the format field from chunk_size; now it holds the size
    # of all the sub-chunks
    chunk_size -= 4
    # GitHub Issue #18: Check if there is enough data to read another chunk
    subchunk_header_size = 4 + sizeof(UInt32)
    fmt = WAVFormat()
    data_position = 0
    data_size = 0
    while chunk_size >= subchunk_header_size
        # Read subchunk ID and size
        subchunk_id = Vector{UInt8}(undef, 4)
        read!(io, subchunk_id)
        subchunk_size = read_le(io, UInt32)
        nextchunk_start = position(io) + subchunk_size
        if subchunk_size > chunk_size
            chunk_size = 0
            break
        end
        chunk_size -= subchunk_header_size + subchunk_size
        # check the subchunk ID
        if subchunk_id == b"fmt "
            fmt = read_format(io, subchunk_size)
            sample_rate = Float32(fmt.sample_rate)
            nbits = bits_per_sample(fmt)
            push!(opt, WAVChunk(fmt))
        elseif subchunk_id == b"data"
            data_position = position(io)
            data_size = subchunk_size
        else
            subchunk_data = Vector{UInt8}(undef, subchunk_size)
            read!(io, subchunk_data)
            push!(opt, WAVChunk(Symbol(subchunk_id), subchunk_data))
        end
        seek(io, nextchunk_start)
    end
    if data_size > 0 && data_position > 0
        seek(io, data_position)
        if format == "size"
            return convert(Int, data_size / fmt.block_align), convert(Int, fmt.nchannels)
        end
        samples = read_data(io, data_size, fmt, format, make_range(subrange))
    end
    return samples, sample_rate, nbits, opt
end