Class: MultiGzReader

Inherits:
Object
  • Object
show all
Defined in:
lib/scbi_multi_gz_reader/multi_gz_reader.rb

Instance Method Summary collapse

Constructor Details

#initialize(file_name) ⇒ MultiGzReader

Returns a new instance of MultiGzReader.



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# File 'lib/scbi_multi_gz_reader/multi_gz_reader.rb', line 5

def initialize(file_name)
  @file_name=file_name

  @file = File.open(@file_name)
  @io = Zlib::GzipReader.new @file
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/scbi_multi_gz_reader/multi_gz_reader.rb', line 52

def close
  #@io.finish
  @file.close
end

#eof ⇒ Object 



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# File 'lib/scbi_multi_gz_reader/multi_gz_reader.rb', line 48

def eof
  eof?
end

#eof? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/scbi_multi_gz_reader/multi_gz_reader.rb', line 43

def eof?
  #nothing more to read
  @io.unused.nil? && (@io.closed? || @io.eof?) && (@file.closed? || @file.eof?)
end

#readline ⇒ Object 



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# File 'lib/scbi_multi_gz_reader/multi_gz_reader.rb', line 12

def readline

  res=nil

  begin
    res=@io.readline
  rescue EOFError => e

    #reached END, check if there is more data to read
    unused = @io.unused

    @io.finish

    # there is something left to read, open another stream
    if !unused.nil?
      #puts "FIN1, fpos: #{@file.pos}, unused: #{unused.length}, io_eof: #{@io.eof}, eof: #{@file.eof}"
    
      @file.pos -= unused.length
      @io = Zlib::GzipReader.new @file
      #repeat the read so there is no eof error
      res=readline

    else
      #no more data to read, return nil
      res=nil
    end
  end

  return res
end

#rewind ⇒ Object 



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# File 'lib/scbi_multi_gz_reader/multi_gz_reader.rb', line 57

def rewind
  close
  @file = File.open(@file_name)
  @io = Zlib::GzipReader.new @file
end