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

#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 95

def initialize(wiredata)
  # First, make sure it's properly delimited.
  if wiredata=~/^<<<.*>>>$/ and wiredata.length>=31
    # 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[0,8].gsub(":","")
    tmp=tmp[8,tmp.length-8]
    # Extract and clean the to field.
    to=tmp[0,8].gsub(":","")
    tmp=tmp[8,tmp.length-8]
    # Extract the frame type.
    type=tmp[0,1].to_i
    tmp=tmp[1,tmp.length-1]
    # Create and populate the object.
    super(from, to, type)
    @wiredata=wiredata
    # Decode the payload.
    case @type
    when FRAME_SIMPLE
      @userdata=tmp
    when FRAME_BASE64
      @userdata=Base64::strict_decode64(tmp)
    when FRAME_COMPRESSED_BASE64
      @userdata=Zlib::Inflate.inflate(Base64::strict_decode64(tmp))
    end
    # Calculate the check the CRC.
    @crc=Zlib::crc32(crcstring).to_s(16).downcase
    if crc==@crc
      @valid=true
    end
  else
    return false
  end
end

Instance Attribute Details

#from ⇒ Object

Returns the value of attribute from.



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# File 'lib/hamnet.rb', line 93

def from
  @from
end

#to ⇒ Object

Returns the value of attribute to.



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# File 'lib/hamnet.rb', line 93

def to
  @to
end

#type ⇒ Object

Returns the value of attribute type.



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# File 'lib/hamnet.rb', line 93

def type
  @type
end

#userdata ⇒ Object

Returns the value of attribute userdata.



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# File 'lib/hamnet.rb', line 93

def userdata
  @userdata
end

#wiredata ⇒ Object

Returns the value of attribute wiredata.



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# File 'lib/hamnet.rb', line 93

def wiredata
  @wiredata
end