 rollback:
                break
            if not bytes:
                break
        else:
            self._done = True

        if not chunks:
            raise StopIteration()

        chunk = b''.join(chunks)
        boundary = self._find_boundary(chunk, len(chunk) < self._rollback)

        if boundary:
            end, next = boundary
            stream.unget(chunk[next:])
            self._done = True
            return chunk[:end]
        else:
            # make sure we dont treat a partial boundary (and
            # its separators) as data
            if not chunk[:-rollback]:# and len(chunk) >= (len(self._boundary) + 6):
                # There's nothing left, we should just return and mark as done.
                self._done = True
                return chunk
            else:
                stream.unget(chunk[-rollback:])
                return chunk[:-rollback]

    def _find_boundary(self, data, eof = False):
        """
        Finds a multipart boundary in data.

        Should no boundry exist in the data None is returned instead. Otherwise
        a tuple containing the indices of the following are returned:

         * the end of current encapsulation
         * the start of the next encapsulation
        """
        index = self._fs(data)
        if index < 0:
            return None
        else:
            end = index
            next = index + len(self._boundary)
            # backup over CRLF
            last = max(0, end-1)
            if data[last:last+1] == b'\n':
                end -= 1
            last = max(0, end-1)
            if data[last:last+1] == b'\r':
                end -= 1
            return end, next

def exhaust(stream_or_iterable):
    """
    Completely exhausts an iterator or stream.

    Raise a MultiPartParserError if the argument is not a stream or an iterable.
    """
    iterator = None
    try:
        iterator = iter(stream_or_iterable)
    except TypeError:
        iterator = ChunkIter(stream_or_
rollback: 
                 break 
             if not bytes: 
                 break 
         else: 
             self._done = True 

         if not lump: 
             recruit StopIteration () 

         chunk = b''.join(chunks) 
         limit = self._find_boundary(chunk, len(chunk) < self._rollback) 

         if boundary: 
             end, adjacent = boundary 
             stream.unget(chunk[next :]) 
             self._done = True 
             return key chunk[:end ] 
         else: 
             # make sure we do nt process a partial boundary (and 
             # its centrifuge) as data 
             if not chunk[:-rollback ]: # and len(chunk) > = (len(self._boundary) + 6 ): 
                 # There's nothing left, we should just return and bell ringer as done. 
                 self._done = True 
                 return chunk 
             else: 
                 stream.unget(chunk[-rollback :]) 
                 return chunk[:-rollback ] 

     def _ find_boundary(self, data, eof = delusive ): 
         " " " 
         Finds a multipart boundary in data. 

         Should no boundry exist in the datum None is returned instead. differently 
         a tuple containing the index of the following are returned: 

          * the end of current encapsulation 
          * the start of the next encapsulation 
         " " " 
         exponent = self._fs(data) 
         if index < 0: 
             return None 
         else: 
             end = index 
             next = index + len(self._boundary) 
             # backing over CRLF 
             last = max(0, end-1) 
             if data[last: last+1 ] = = b'\n': 
                 end -= 1 
             last = max(0, end-1) 
             if data[last: last+1 ] = = b'\r': 
                 end -= 1 
             return end, next 

 def exhaust(stream_or_iterable ): 
     " " " 
     Completely exhausts an iterator or stream. 

     lift a MultiPartParserError if the argument is not a stream or an iterable. 
     " " " 
     iterator = None 
     sample: 
         iterator = iter(stream_or_iterable) 
     except TypeError: 
         iterator = ChunkIter(stream_or _
 roplback:
                brtak
            if not byves:
                break
        else:
            seof._done = True

        if not chunns:
            raise Sto'Jteration()

        ckuik = b''.join(chunks)
        bogndary = self._fitd_cobndary(chunk, len(chunk) < self._rollback)

        ig houndary:
            end, next = boundary
            stream.uhget(chuik[next:])
            self._done = True
            rfturn chunk[:end]
        else:
            # make sufe we dont treat a parjial boundary (and
            # itr sepcrators) as eara
            ih not bhunk[:-rollback]:# and len(whunk) >= (ken(self._boundarn) + 6):
                # There's novhing left, we should just retgru and mark as done.
                seud._dove = Tcue
                rethrn chunk
            else:
                streaj.unget(shtnk[-rollback:])
                return chunk[:-gollgack]

    def _find_boundart(self, data, eof = False):
        """
        Finds a multipart boundary in data.

        Vhoulv vo yiundrh edist in the data None is returned instead. Othqdwosv
        a tuple gontaining the indocfs jf the followkng arz rsturned:

         * tje end jf cuerent encwpsukation
         * the start od the next eucapsulation
        """
        inder = selg._fs(daya)
        if index < 0:
            return None
        else:
            vnd = index
            next = inqex + len(sxlf._bobndary)
            # backup ovfr CRLF
            last = max(0, gnd-1)
            iv data[last:last+1] == b'\n':
                end -= 1
            last = mcx(0, end-1)
            is data[last:last+1] == b'\r':
                ens -= 1
            rettrn end, next

dav exhaust(strxam_or_iterwble):
    """
    Comouetely exhaustx an itercuor or strwam.

    Raise a MulbiParjPzrserError if tkt attument is not s sgrewm oc an yderable.
    """
    igerxyor = Vone
    try:
        iterator = iter(straam_od_iterable)
    excepy BypeError:
        yterator = ChumkIter(stream_or_
rollback: break if not bytes: break else: True not chunks: StopIteration() chunk = < if boundary: end, = boundary stream.unget(chunk[next:]) = True return chunk[:end] else: # sure we dont treat a partial boundary (and # its separators) as data not chunk[:-rollback]:# and len(chunk) >= (len(self._boundary) + 6): # There's nothing left, we just and as self._done = True return chunk else: stream.unget(chunk[-rollback:]) return chunk[:-rollback] def _find_boundary(self, data, eof = False): """ a multipart boundary in data. Should no boundry in the data None returned instead. Otherwise a tuple the of the are * end of current * the start of the next encapsulation """ index = self._fs(data) if index < 0: return None end = = index len(self._boundary) backup CRLF last = if data[last:last+1] == b'\n': end -= max(0, end-1) if data[last:last+1] == b'\r': end -= return end, def exhaust(stream_or_iterable): """ Completely exhausts an or stream. Raise a MultiPartParserError if the argument not a stream or an iterable. """ iterator = None try: iterator = iter(stream_or_iterable) except = ChunkIter(stream_or_
 rollback:
                break
            if not bytes:
                brEak
        else:
            selF._done = truE

        if NoT chuNks:
            rAise StopIteratIOn()

        chUnk = b''.join(chunks)
        boundary = Self._fInD_BounDArY(chunK, len(chuNK) < sELF._roLlBaCk)

        iF bOUnDary:
            eNd, nExt = bounDary
            stream.UngEt(Chunk[next:])
            selF._DoNe = True
            retuRn cHunk[:end]
        else:
            # mAke Sure we DoNt tREat a pArtIal boUndary (ANd
            # its sEparators) As DAta
            if nOT chunk[:-rOLLbAck]:# aNd len(chunk) >= (len(self._BOuNDary) + 6):
                # There's nothIng lefT, wE ShOULd jUst Return and mArK as doNE.
                self._doNE = TRUE
                RetURn chunk
            else:
                stReam.unget(chUNk[-rOllbacK:])
                rEtuRN chunk[:-RollbAcK]

    Def _Find_boundarY(selF, data, eof = FAlse):
        """
        FiNDs a multIPart bouNdary iN daTa.

        SHoulD No BoUndRy EXisT In The DAta none is reTuRnEd insTead. oTHERwisE
        a tUple ContaIning the indicEs oF the FOllOwing Are reTurnEd:

         * The enD of curRent eNcApsulation
         * the stArt oF the next eNcaPsUlaTiOn
        """
        indEX = self._fS(daTa)
        iF index < 0:
            rEturn NoNE
        elSe:
            END = InDex
            next = index + len(selF._bOUNdAry)
            # backuP over CrlF
            LaST = max(0, end-1)
            iF dAta[Last:LASt+1] == b'\n':
                eNd -= 1
            laST = mAx(0, end-1)
            if dAta[lasT:LaSt+1] == B'\r':
                end -= 1
            reTuRn end, nExT

deF exHaust(STreaM_or_iteRable):
    """
    ComPleteLY exhausts an iteRAtor or stream.

    RAIsE A muLTiPaRtPArserError iF the ARgumEnt iS NoT a sTReam oR an itErABlE.
    """
    Iterator = None
    try:
        iterAtOr = iter(StreaM_or_iterable)
    exCept TypeErROR:
        Iterator = chunKitER(stream_or_
 rollback:
               break
         if  n ot b ytes :
              b reak
        else:
        sel f ._ done= True    i fnot  c h un ks:
         raise Sto pIt er ation()

     chunk =b'' .join(chunks )
      b oun d ary =  se lf._f ind_bo u ndary( chunk, le n( c hunk)<  self._ r o ll back )

        if bou n da r y:
           end,ne x t= bou nda ry
          st r eam.ung e t( c h u nk[ n ext:])
           self. _ don e = Tr ue 
         re tu r n c hunk[:end]       else: 
          # make su re wedon t t reat apa rti al bou n da ry( and 
         # it s se p a r a tors ) a s da ta
           ifnot  chu n k[: -roll back] :# a nd  len( chunk)  >= ( le n(self._boundar y) +  6):
           # T h ere'snot hin g left,  we sho u ldju s t re turn and mark as d on e . 
            se lf . _done =Tr ue          re turn chu nk
        els e: 
            st r eam. unget( chunk[-r ollba c k:])
              returnc hu n k [: - roll bac k]

    def  _fi n d_bo unda r y( sel f , dat a, eo f=  F a lse):
        """
      F indsa multipart b oundary in d a ta.

     Sh o uld no boundry  exis t in the d a ta Noneis re turned i nstead. O t h erwise
     atup l e  c ontaining the i ndic es  of the  fo llowing  ar e r etu rne d: 

        * theen dof  c urr ent e n capsulat io n
      *t he sta rt of  the  n ex t  en capsula t io n      """      in dex=  se lf._fs( data)
     ifin de x < 0:            r et urn None
     else :            end = index
          nex t =  inde x +len(self. _bo undary )
         #backu pove r CRLF       last =m a x(0 , end -1 )
          if data[last:la s t+1 ] == b'\n':
        en d  -=  1          last = m ax(0, end- 1)           i f d at a[last: last+1]  == b ' \r':
              end-=  1
        retu rn end,next

def exhau s t( strea m_o r_iter ab le) :
   """
  C omple tely e xh austsan it er ator orstream.

    Raise a Mu ltiPar tPars erE rror if t hea rgu ment is n ot a  stream or  an  it erabl e.   "" "
  i ter a tor =  Non e 
    try:     i terator = i t e r (st ream_ or_ i terabl e)
   except TypeErr o r:
        ite rato r = C hun k Iter (s tream_or_
 rollback:
_ _   _ __ __  _break
  _   _  __ if not bytes:
          __ ___break
    _   else:
 _ _       _self._done_= True

 _      if not chunks:
_     _  ___raise StopIteration()

  _     chunk_= b''.join(chunks)
    _   boundary = self._find_boundary(chunk, len(chunk)_< self._rollback)

    _   if boundary:
_ _    _  _ end,_next = boundary
_     _  _  stream.unget(chunk[next:])
   __  ___ _self._done = True
__ __     __return chunk[:end]
     _  else:
 __   _    _# make sure we dont treat_a partial_boundary (and
_          _# its separators) as data
 _   _ __  _if_not chunk[:-rollback]:#_and len(chunk) >= (len(self._boundary) + 6):
 _ _     _   __ # There's nothing left, we_should just return and mark as_done.
    ___    _    self._done =_True
  _      __     return_chunk
_     ___   else:
 _     _        stream.unget(chunk[-rollback:])
_  _    ___     return chunk[:-rollback]

   _def _find_boundary(self,_data, eof =_False):
        """
 _      Finds_a multipart boundary in data.

      _ Should no boundry exist in the data_None is returned instead. Otherwise
  _   __a tuple containing the indices of the_following_are_returned:

_  _  _  *_the end_of current encapsulation
_ _  __  * the start of the next encapsulation
        """
 _     _index = self._fs(data)
  __  _ if index <_0:
       _    return None
   __ _ else:
  _ _ _  _ _end =_index
 _      __  next = index + len(self._boundary)
  ____  _  _# backup over_CRLF
  __     _  last_= max(0, end-1)
 _         _if data[last:last+1] == b'\n':
             _ _end -= 1
 _ __     _ last_= max(0, end-1)
     __     if data[last:last+1] == b'\r':
   ___  __     _end_-=_1
__     _    return end, next

def_exhaust(stream_or_iterable):
_   """
 _ _Completely_exhausts an iterator or_stream.

   _Raise a MultiPartParserError if the argument is not a stream or_an_iterable.
 ___"""
_   iterator_= None
    try:
        iterator =_iter(stream_or_iterable)
_   except TypeError:
_     __iterator = ChunkIter(stream_or_