Class: Partoo::Par2File

Inherits:
BinData::Record
  • Object
show all
Defined in:
lib/partoo/par2_file.rb,
lib/partoo/par2_file/packet.rb,
lib/partoo/par2_file/packet/main.rb,
lib/partoo/par2_file/packet/creator.rb,
lib/partoo/par2_file/packet/recovery_slice.rb,
lib/partoo/par2_file/packet/file_description.rb,
lib/partoo/par2_file/packet/input_file_slice_checksum.rb

Defined Under Namespace

Classes: Packet

Instance Method Summary collapse

Instance Method Details

#crc32_by_id(id) ⇒ Object 



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# File 'lib/partoo/par2_file.rb', line 18

def crc32_by_id(id)
  crc = ""
  input_file_slice_checksum_packet_by_id(id)[0]['body']['chunk_checksums'].each do |cc|
    crc_b = cc['crc32']
    if crc != ""
      crc = Zlib.crc32_combine(crc, crc_b, slice_size)
    else
      crc = crc_b
    end
  end
  pad_length = slice_size - file_description_packet_by_id(id)[0]['body'].file_length % slice_size
  crc_z = Zlib.crc32("\0" * pad_length)
  Partoo::CRC32.crc32_trim_trailing(crc, crc_z, pad_length)
end

#creator ⇒ Object 



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# File 'lib/partoo/par2_file.rb', line 33

def creator
  creator_packet[0]['body']['creator']
end

#creator_packet ⇒ Object 



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# File 'lib/partoo/par2_file.rb', line 53

def creator_packet
  packets.select {|p| p['packet_type'] == "PAR 2.0\0Creator\0" }
end

#file_description_packet_by_id(id) ⇒ Object 



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# File 'lib/partoo/par2_file.rb', line 57

def file_description_packet_by_id(id)
  packets.select {|p| p['packet_type'] == "PAR 2.0\0FileDesc" && p['body']['file_id'] == id }
end

#file_ids ⇒ Object 



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# File 'lib/partoo/par2_file.rb', line 37

def file_ids
  main_packet[0]['body']['file_ids']
end

#input_file_slice_checksum_packet_by_id(id) ⇒ Object 



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# File 'lib/partoo/par2_file.rb', line 61

def input_file_slice_checksum_packet_by_id(id)
  packets.select {|p| p['packet_type'] == "PAR 2.0\0IFSC\0\0\0\0" && p['body']['file_id'] == id }
end

#list ⇒ Object 



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# File 'lib/partoo/par2_file.rb', line 12

def list
  file_ids.map do |id|
    [file_description_packet_by_id(id)[0]['body'], {:file_crc32 => crc32_by_id(id)}]
  end
end

#main_packet ⇒ Object 



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# File 'lib/partoo/par2_file.rb', line 65

def main_packet
  packets.select {|p| p['packet_type'] == "PAR 2.0\0Main\0\0\0\0" }
end

#recovery_set_file_count ⇒ Object 



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# File 'lib/partoo/par2_file.rb', line 45

def recovery_set_file_count
  main_packet[0]['body']['recovery_set_file_count']
end

#recovery_set_id ⇒ Object 



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# File 'lib/partoo/par2_file.rb', line 49

def recovery_set_id
  main_packet[0]['recovery_set_id']
end

#slice_size ⇒ Object 



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# File 'lib/partoo/par2_file.rb', line 41

def slice_size
  main_packet[0]['body']['slice_size']
end