77 lines
1.9 KiB
Julia
77 lines
1.9 KiB
Julia
module body
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# TODO: Why do this?
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import Base.show
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export DefinitionHeader, DataRecord, read_row
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include("bytes.jl"); using.bytes
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include("mesg_num.jl"); using .mesg_num
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struct DefinitionHeader
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endianness::AbstractString
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number::Int64
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fields::UInt8
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end
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# TODO: field_number has a string value, type has a Julia type.
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struct DefinitionField
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field_number::AbstractString
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size::UInt8
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type::UInt8
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end
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struct DataRecord
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hdr::DefinitionHeader
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end
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"""
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read_row(f::io)
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Read a row of the file at a time. Parse the row into a data or def message.
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TODO: Endianness matters here. Need to resolve endianness with the architecture bit.
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"""
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function read_row(f::IO)::DefinitionHeader
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header_byte = read(f, 1; all=false)[1]
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definition_message = Bool(bit_at(header_byte, 2))
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# The message byte is 7
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# hdr = RecordHeader(
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# Bool(bit_at(header_byte, 2)),
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# Bool(bit_at(header_byte, 1)))
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# TODO: hdr if compressed timestamp needs to be handled in special way.
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if definition_message
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fixed_bytes = read(f, 5; all=false)
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hdr = DefinitionHeader(
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endianness(fixed_bytes[2]), byte_vec_to_int(fixed_bytes[3:4]), fixed_bytes[end]
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)
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end
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hdr_fields = [hdr_field(read(f, 3; all=false)) for i ∈ 1:hdr.fields + 1]
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println(hdr_fields)
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hdr
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end
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function hdr_field(vec::Vector{UInt8})::DefinitionField
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println(vec)
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DefinitionField(
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get_mesg_num_string(vec[1]), vec[2], vec[3]
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)
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end
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function endianness(b::UInt8)::AbstractString
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Bool(b) ? "BigEndian" : "LittleEndian"
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end
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function show(io::IO, header::DefinitionHeader)
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print(io, "DefinitionHeader($(header.endianness), $(header.number), $(header.fields) messages)")
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end
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function show(io::IO, field::DefinitionField)
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print(io, "DefinitionField($(field.field_number), $(field.size), $(field.type))")
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end
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end
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