code: def decompile(self, data, ttFont):
      dummy, newData = sstruct.unpack2(DSIG_HeaderFormat, data, self)
      assert self.ulVersion == 1, "DSIG ulVersion must be 1"
      assert self.usFlag & ~1 == 0, "DSIG usFlag must be 0x1 or 0x0"
      self.signatureRecords = sigrecs = []
      for n in range(self.usNumSigs):
          sigrec, newData = sstruct.unpack2(
              DSIG_SignatureFormat, newData, SignatureRecord()
          )
          assert sigrec.ulFormat == 1, (
              "DSIG signature record #%d ulFormat must be 1" % n
          )
          sigrecs.append(sigrec)
      for sigrec in sigrecs:
          dummy, newData = sstruct.unpack2(
              DSIG_SignatureBlockFormat, data[sigrec.ulOffset :], sigrec
          )
          assert sigrec.usReserved1 == 0, (
              "DSIG signature record #%d usReserverd1 must be 0" % n
          )
          assert sigrec.usReserved2 == 0, (
              "DSIG signature record #%d usReserverd2 must be 0" % n
          )
          sigrec.pkcs7 = newData[: sigrec.cbSignature]
  
file_path: catboost/contrib/python/fonttools/fontTools/ttLib/tables/D_S_I_G_.py
imports: from fontTools.misc.textTools import bytesjoin, strjoin, tobytes, tostr, safeEval
  from fontTools.misc import sstruct
  from .None import DefaultTable
  import base64
label_desc: Use image node_id 1 for calling the table_D_S_I_G_ obj's underlying member method code with example usage: obj.decompile(data, ttFont) without return types