code: def __init__(self, file, checkChecksums=0, fontNumber=-1):
      self.file = file
      self.checkChecksums = checkChecksums
  
      self.flavor = None
      self.flavorData = None
      self.DirectoryEntry = SFNTDirectoryEntry
      self.file.seek(0)
      self.sfntVersion = self.file.read(4)
      self.file.seek(0)
      if self.sfntVersion == b"ttcf":
          header = readTTCHeader(self.file)
          numFonts = header.numFonts
          if not 0 <= fontNumber < numFonts:
              raise TTLibFileIsCollectionError(
                  "specify a font number between 0 and %d (inclusive)"
                  % (numFonts - 1)
              )
          self.numFonts = numFonts
          self.file.seek(header.offsetTable[fontNumber])
          data = self.file.read(sfntDirectorySize)
          if len(data) != sfntDirectorySize:
              raise TTLibError(
                  "Not a Font Collection (not enough data)"
              )
          sstruct.unpack(sfntDirectoryFormat, data, self)
      elif self.sfntVersion == b"wOFF":
          self.flavor = "woff"
          self.DirectoryEntry = WOFFDirectoryEntry
          data = self.file.read(woffDirectorySize)
          if len(data) != woffDirectorySize:
              raise TTLibError("Not a WOFF font (not enough data)")
          sstruct.unpack(woffDirectoryFormat, data, self)
      else:
          data = self.file.read(sfntDirectorySize)
          if len(data) != sfntDirectorySize:
              raise TTLibError(
                  "Not a TrueType or OpenType font (not enough data)"
              )
          sstruct.unpack(sfntDirectoryFormat, data, self)
      self.sfntVersion = Tag(self.sfntVersion)
  
      if self.sfntVersion not in ("\x00\x01\x00\x00", "OTTO", "true"):
          raise TTLibError(
              "Not a TrueType or OpenType font (bad sfntVersion)"
          )
      tables = {}
      for i in range(self.numTables):
          entry = self.DirectoryEntry()
          entry.fromFile(self.file)
          tag = Tag(entry.tag)
          tables[tag] = entry
      self.tables = OrderedDict(
          sorted(tables.items(), key=lambda i: i[1].offset)
      )
  
      # Load flavor data if any
      if self.flavor == "woff":
          self.flavorData = WOFFFlavorData(self)
  
imports: from io import BytesIO
  from types import SimpleNamespace
  from fontTools.misc.textTools import Tag
  from fontTools.misc import sstruct
  from fontTools.ttLib import TTLibError, TTLibFileIsCollectionError
  import struct
  from collections import OrderedDict
  import logging
label_desc: Use image node_id 2 to create a new SFNTReader object from inherited base classes: object with example: obj = SFNTReader(file, checkChecksums, fontNumber)