Class: RxFrame

Inherits:
Frame show all
Defined in:
lib/hamnet.rb

Overview

This defines a frame received using fldigi. You supply it with the frame (delimited with “<<<” and “>>>”, and it validates the frame, then creates and populates an object with the fields of that frame.

Instance Attribute Summary collapse

Attributes inherited from Frame

#frompad, #topad, #valid

Instance Method Summary collapse

Methods inherited from Frame

#to_s

Constructor Details

#initialize(wiredata) ⇒ RxFrame

Returns a new instance of RxFrame.



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# File 'lib/hamnet.rb', line 120

def initialize(wiredata)
  # First, make sure it's properly delimited.
  if wiredata=~/^<<<.*?>>>$/ and wiredata.length>=31
    begin
      # Remove the "<<<" and ">>>"
      tmp=wiredata[3,wiredata.length-6]
      # Extract the crc field.
      crc=tmp[tmp.length-8,8]
      tmp=tmp[0,tmp.length-8]
      # Save this for checking CRC later.
      crcstring=tmp
      # Extract and clean the from field.
      from=tmp[0,9].gsub(":","")
      tmp=tmp[9,tmp.length-9]
      # Extract and clean the to field.
      to=tmp[0,9].gsub(":","")
      tmp=tmp[9,tmp.length-9]
      # Extract the frame type.
      type=tmp[0,2].to_i(16)
      tmp=tmp[2,tmp.length-2]
      # Extract the sequence number.
      sequence=tmp[0,2].to_i(16)
      tmp=tmp[2,tmp.length-2]
      # See if this is a "done" frame.
      done=false
      if type!=(type&127)
        done=true
        type=(type&127)
      end
      # Create and populate the object.
      super(from, to, type, sequence, done)
      @wiredata=wiredata
      # Decode the payload.
      case @type
      when HAMNET_FRAME_PING
        @userdata=""
      when HAMNET_FRAME_PING_REPLY
        @userdata=tmp
      when HAMNET_FRAME_ACK
        @userdata=""
      when HAMNET_FRAME_SIMPLE
        @userdata=tmp
      when HAMNET_FRAME_BASE64
        @userdata=Base64::strict_decode64(tmp)
      when HAMNET_FRAME_COMPRESSED_BASE64
        @userdata=Zlib::Inflate.inflate(Base64::strict_decode64(tmp))
      end
      # Calculate and check the CRC.
      @crc=Zlib::crc32(crcstring).to_s(16).downcase
      if crc==@crc
        @valid=true
      end
    rescue
      # This is bad.
      return nil
    end
  else
    return nil
  end
end

Instance Attribute Details

#done ⇒ Object

Returns the value of attribute done.



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# File 'lib/hamnet.rb', line 118

def done
  @done
end

#from ⇒ Object

Returns the value of attribute from.



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# File 'lib/hamnet.rb', line 118

def from
  @from
end

#sequence ⇒ Object

Returns the value of attribute sequence.



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# File 'lib/hamnet.rb', line 118

def sequence
  @sequence
end

#to ⇒ Object

Returns the value of attribute to.



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# File 'lib/hamnet.rb', line 118

def to
  @to
end

#type ⇒ Object

Returns the value of attribute type.



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# File 'lib/hamnet.rb', line 118

def type
  @type
end

#userdata ⇒ Object

Returns the value of attribute userdata.



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# File 'lib/hamnet.rb', line 118

def userdata
  @userdata
end

#wiredata ⇒ Object

Returns the value of attribute wiredata.



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# File 'lib/hamnet.rb', line 118

def wiredata
  @wiredata
end