Class: Fit4Ruby::FitFile

Inherits:
Object
  • Object
show all
Defined in:
lib/fit4ruby/FitFile.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ FitFile

Returns a new instance of FitFile.



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# File 'lib/fit4ruby/FitFile.rb', line 27

def initialize()
  @header = nil
end

Instance Method Details

#read(file_name, filter = nil) ⇒ Object 



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# File 'lib/fit4ruby/FitFile.rb', line 31

def read(file_name, filter = nil)
  @file_name = file_name
  definitions = {}
  begin
    io = ::File.open(file_name, 'rb')
  rescue StandardError => e
    Log.fatal "Cannot open FIT file '#{file_name}': #{e.message}"
  end
  header = FitHeader.read(io)
  header.check

  check_crc(io, header.end_pos)

  entity = FitFileEntity.new
  # This Array holds the raw data of the records that may be needed to
  # dump a human readable form of the FIT file.
  records = []
  # This hash will hold a counter for each record type. The counter is
  # incremented each time the corresponding record type is found.
  record_counters = Hash.new { 0 }
  while io.pos < header.end_pos
    record = FitRecord.new(definitions)
    record.read(io, entity, filter, record_counters)
    records << record if filter
  end

  io.close

  header.dump if filter && filter.record_numbers.nil?
  dump_records(records) if filter

  entity.check
  entity.top_level_record
end

#write(file_name, top_level_record) ⇒ Object 



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# File 'lib/fit4ruby/FitFile.rb', line 66

def write(file_name, top_level_record)
  begin
    io = ::File.open(file_name, 'wb+')
  rescue StandardError => e
    Log.fatal "Cannot open FIT file '#{file_name}': #{e.message}"
  end

  # Create a header object, but don't yet write it into the file.
  header = FitHeader.new
  start_pos = header.header_size
  # Move the pointer behind the header section.
  io.seek(start_pos)
  id_mapper = FitMessageIdMapper.new
  top_level_record.write(io, id_mapper)
  end_pos = io.pos

  crc = write_crc(io, start_pos, end_pos)

  # Complete the data of the header section and write it at the start of
  # the file.
  header.data_size = end_pos - start_pos
  header.crc = crc
  io.seek(0)
  header.write(io)

  io.close
end