code: def b64encode(b):
      s = base64.b64encode(b)
      # Line-break at 76 chars.
      items = []
      while s:
          items.append(tostr(s[:76]))
          items.append("\n")
          s = s[76:]
      return strjoin(items)
  
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 a global function with example usage: b64encode(b) and returns: strjoin