### Home Classes Methods

### In Files

- lib/packetfu/pcap.rb

### Parent

Struct.new(:endian, :timestamp, :incl_len, :orig_len, :data)

### Methods

- ::new
- #init_fields
- #read
- #to_s

### Included Modules

- StructFu

### Files

- .document
- README.rdoc

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No matching classes.

# PacketFu::PcapPacket

PcapPacket defines how individual packets are stored in a libpcap-formatted file.

#### Header Definition

Timestamp :timestamp Int32 :incl_len Int32 :orig_len String :data

### Public Class Methods

new(args={}) click to toggle source

    # File lib/packetfu/pcap.rb, line 149
    def initialize(args={})
      set_endianness(args[:endian] ||= :little)
      init_fields(args)
      super(args[:endian], args[:timestamp], args[:incl_len],
           args[:orig_len], args[:data])
    end

### Public Instance Methods

init_fields(args={}) click to toggle source

Called by initialize to set the initial fields.

    # File lib/packetfu/pcap.rb, line 157
    def init_fields(args={})
      args[:timestamp] = Timestamp.new(:endian => args[:endian]).read(args[:timestamp])
      args[:incl_len] = args[:incl_len].nil? ? @int32.new(args[:data].to_s.size) : @int32.new(args[:incl_len])
      args[:orig_len] = @int32.new(args[:orig_len])
      args[:data] = StructFu::String.new.read(args[:data])
    end

read(str) click to toggle source

Reads a string to populate the object.

    # File lib/packetfu/pcap.rb, line 170
    def read(str)
      return unless str
      force_binary(str)
      self[:timestamp].read str[0,8]
      self[:incl_len].read str[8,4]
      self[:orig_len].read str[12,4]
      self[:data].read str[16,self[:incl_len].to_i]
      self
    end

to_s() click to toggle source

Returns the object in string form.

    # File lib/packetfu/pcap.rb, line 165
    def to_s
      self.to_a[1,4].map {|x| x.to_s}.join
    end

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