class_docstr: the OS/2 table
class_docstr_tok: ["the","OS\/2","table"]
code: def decompile(self, data, ttFont):
      dummy, data = sstruct.unpack2(OS2_format_0, data, self)
  
      if self.version == 1:
          dummy, data = sstruct.unpack2(
              OS2_format_1_addition, data, self
          )
      elif self.version in (2, 3, 4):
          dummy, data = sstruct.unpack2(
              OS2_format_2_addition, data, self
          )
      elif self.version == 5:
          dummy, data = sstruct.unpack2(
              OS2_format_5_addition, data, self
          )
          self.usLowerOpticalPointSize /= 20
          self.usUpperOpticalPointSize /= 20
      elif self.version != 0:
          from fontTools import ttLib
  
          raise ttLib.TTLibError(
              "unknown format for OS/2 table: version %s" % self.version
          )
      if len(data):
          log.warning("too much 'OS/2' table data")
  
      self.panose = sstruct.unpack(panoseFormat, self.panose, Panose())
  
imports: from fontTools.misc import sstruct
  from fontTools.misc.roundTools import otRound
  from fontTools.misc.textTools import safeEval, num2binary, binary2num
  from fontTools.ttLib.tables import DefaultTable
  import bisect
  import logging
label_desc: Use image node_id 1 for calling the table_O_S_2f_2 obj's underlying member method code with example usage: obj.decompile(data, ttFont) without return types