Class: SmcUtil::FileReader

Inherits:
Object
  • Object
show all
Defined in:
lib/smcutil/file_reader.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(data) ⇒ FileReader

Returns a new instance of FileReader.



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# File 'lib/smcutil/file_reader.rb', line 10

def initialize(data)

  # Setup the collected data
  @headers = []
  @signature = ''
  @regions = []

  current_region = nil

  data.each_line.with_index do |line, index|
    # Zero based indexing is not compatible with how people think about lines in a file
    index += 1

    # Prepare to parse the line
    line ||= line.strip!
    puts "INFO: #{line}" && next if line.nil? or line.start_with? '#'
    match = LINE_COMMAND.match(line)
    raise "LINE #{index}: Does not match format" unless match

    # Validate Length
    raise "LINE #{index}: Length mismatch on line; expected #{match[:length]}, got #{match[:data].length / 2}" unless match[:length].to_i == match[:data].length / 2

    # Validate check digit
    data = match[:data].scan(/../).map { |x| x.hex.chr }.join
    check = match[:check].to_i(16)
    sum = data.codepoints.map { |c| c.to_i }.reduce(:+) & 0xFF
    raise "LINE #{index}: Checksum does not match; exptected #{check}, got #{sum}" unless sum == check

    case match[:type]
      when 'H'
        @headers << data
      when 'S'
        @signature += data
      when 'D'
        if match[:offset]
          current_offset = match[:offset].scan(/../).map { |x| x.hex.chr }.join.bytes.inject {|a, b| (a << 8) + b }

          current_region = SmcUtil::Region.new current_offset, ''
          @regions << current_region
        end

        current_region.data += data
      else
        raise "LINE #{index}: Command #{match[:type]} not recognised" unless match[:continue]
        raise "LINE #{index}: Continuation row with no data region set" unless current_region

        current_region.data += data
    end
  end
end

Instance Attribute Details

#headers ⇒ Object (readonly)

Returns the value of attribute headers.



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# File 'lib/smcutil/file_reader.rb', line 5

def headers
  @headers
end

#regions ⇒ Object (readonly)

Returns the value of attribute regions.



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# File 'lib/smcutil/file_reader.rb', line 7

def regions
  @regions
end

#signature ⇒ Object (readonly)

Returns the value of attribute signature.



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# File 'lib/smcutil/file_reader.rb', line 6

def signature
  @signature
end

Class Method Details

.parse(path) ⇒ Object 



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# File 'lib/smcutil/file_reader.rb', line 61

def self.parse(path)
   FileReader.new(File.open(path))
end