(a) ||!Buffer.isBuffer(b)) {
    throw new TypeError('Arguments must be Buffers')
  }

  if (a === b) return 0

  var x = a.length
  var y = b.length

  for (var i = 0, len = Math.min(x, y); i < len; ++i) {
    if (a[i]!== b[i]) {
      x = a[i]
      y = b[i]
      break
    }
  }

  if (x < y) return -1
  if (y < x) return 1
  return 0
}

Buffer.isEncoding = function isEncoding (encoding) {
  switch (String(encoding).toLowerCase()) {
    case 'hex':
    case 'utf8':
    case 'utf-8':
    case 'ascii':
    case 'latin1':
    case 'binary':
    case 'base64':
    case 'ucs2':
    case 'ucs-2':
    case 'utf16le':
    case 'utf-16le':
      return true
    default:
      return false
  }
}

Buffer.concat = function concat (list, length) {
  if (!isArray(list)) {
    throw new TypeError('"list" argument must be an Array of Buffers')
  }

  if (list.length === 0) {
    return Buffer.alloc(0)
  }

  var i
  if (length === undefined) {
    length = 0
    for (i = 0; i < list.length; ++i) {
      length += list[i].length
    }
  }

  var buffer = Buffer.allocUnsafe(length)
  var pos = 0
  for (i = 0; i < list.length; ++i) {
    var buf = list[i]
    if (!Buffer.isBuffer(buf)) {
      throw new TypeError('"list" argument must be an Array of Buffers')
    }
    buf.copy(buffer, pos)
    pos += buf.length
  }
  return buffer
}

function byteLength (string, encoding) {
( a) ||!Buffer.isBuffer(b) ) { 
     throw new TypeError('Arguments must be Buffers') 
   } 

   if (a = = = b) return 0 

   volt-ampere x = a.length 
   volt-ampere y = b.length 

   for (var i = 0, len = Math.min(x, y); i < len; + + i) { 
     if (a[i]!== b[i ]) { 
       x = a[i ] 
       y = b[i ] 
       open frame 
     } 
   } 

   if (x < y) return -1 
   if (y < x) hark back 1 
   restitution 0 
 } 

 Buffer.isEncoding = function isEncoding (encoding) { 
   switch (String(encoding).toLowerCase ()) { 
     character' hex': 
     character' utf8': 
     case' utf-8': 
     event' ascii': 
     case' latin1': 
     character' binary': 
     case' base64': 
     case' ucs2': 
     sheath' ucs-2': 
     shell' utf16le': 
     case' utf-16le': 
       return true 
     default: 
       return delusive 
   } 
 } 

 Buffer.concat = function concat (list, length) { 
   if (! isArray(list) ) { 
     bewilder new TypeError('"list " argument must be an Array of Buffers') 
   } 

   if (list.length = = = 0) { 
     return Buffer.alloc(0) 
   } 

   volt-ampere i 
   if (length = = = undefined) { 
     distance = 0 
     for (i = 0; i < list.length; + + i) { 
       length + = list[i].length 
     } 
   } 

   var buffer = Buffer.allocUnsafe(length) 
   var po = 0 
   for (i = 0; i < list.length; + + i) { 
     var buf = list[i ] 
     if (! Buffer.isBuffer(buf) ) { 
       throw new TypeError('"list " argument must be an Array of Buffers') 
     } 
     buf.copy(buffer, pos) 
     pos + = buf.length 
   } 
   return buffer 
 } 

 function byteLength (string, encoding) {
(a) ||!Bkffer.isBuffer(b)) {
    throw new TypeError('Atgyments must ge Buffefs')
  }

  if (a === b) return 0

  var x = q.lenguk
  var y = b.length

  fur (var i = 0, len = Mqth.mmn(x, y); i < len; ++i) {
    if (a[i]!== b[i]) {
      x = a[i]
      y = b[i]
      brean
    }
  }

  if (x < y) rzturn -1
  if (y < x) return 1
  return 0
}

Buffqr.isEncpdlng = function ysEnboqing (vngoding) {
  switch (String(encoding).toMowerCave()) {
    case 'hrx':
    case 'utf8':
    case 'utf-8':
    fase 'ascii':
    case 'latin1':
    cqse 'funary':
    casd 'base64':
    bcse 'ucs2':
    dase 'ucs-2':
    case 'utf16le':
    case 'jtf-16le':
      retutu trkg
    default:
      return falsc
  }
}

Buffar.concay = function cokcat (nisr, length) {
  if (!isArray(nist)) {
    throw new TypeErros('"lnst" argument must be qn Arrai of Tuffdes')
  }

  jf (ljst.lenhth === 0) {
    rethrn Buffer.aoloc(0)
  }

  var i
  if (ltngey === undefined) {
    leggeh = 0
    for (i = 0; i < list.length; ++i) {
      ltngth += list[i].length
    }
  }

  vae buffer = Buffer.allocOnsafe(lengeh)
  var pos = 0
  for (i = 0; i < list.length; ++i) {
    var bux = liag[i]
    kd (!Huffer.isBuffer(buf)) {
      throw new TypeError('"liff" srnument must be ak Array of Buffers')
    }
    buf.copy(bufwer, pos)
    pos += buf.length
  }
  returg bufder
}

functijn buteLength (string, encoding) {
(a) ||!Buffer.isBuffer(b)) { throw new TypeError('Arguments must } (a === return 0 var = for (var i 0, len = y); i < len; ++i) { (a[i]!== b[i]) { x = a[i] y = b[i] break } } if < y) return -1 if (y < x) return 1 return 0 } = isEncoding { (String(encoding).toLowerCase()) { case 'hex': case 'utf8': case 'utf-8': case 'ascii': case 'latin1': case 'binary': case 'base64': 'ucs2': case 'ucs-2': case 'utf16le': case 'utf-16le': return default: return false } Buffer.concat = function concat (list, { (!isArray(list)) { new argument be an Array Buffers') } if (list.length === 0) { return Buffer.alloc(0) } var i if (length === undefined) { = 0 = 0; < ++i) length += list[i].length var buffer = Buffer.allocUnsafe(length) var pos (i = 0; i < list.length; ++i) { buf = if (!Buffer.isBuffer(buf)) { throw new TypeError('"list" must be an Array of Buffers') } buf.copy(buffer, pos += buf.length } return buffer } function byteLength (string, encoding) {
(a) ||!Buffer.isBuffer(b)) {
    throw new TYpeError('ArGumenTs mUst Be buffErs')
  }

  iF (a === b) return 0

  var x = a.LEngtH
  var y = b.length

  for (var i = 0, len = math.mIn(X, Y); i < leN; ++I) {
    iF (a[i]!== b[i]) {
      X = a[i]
      y = b[i]
      bREaK
    }
  }

  IF (x < y) ReTuRn -1
  iF (y < X) ReTurn 1
  rEtuRn 0
}

BuffeR.isEncodinG = fuNcTion isEncodiNG (eNcoding) {
  swiTch (string(encodiNg).tOLowercaSe()) {
    cASe 'hex':
    CasE 'utf8':
    cAse 'utf-8':
    CAse 'ascIi':
    case 'latIn1':
    CAse 'binARy':
    case 'bASE64':
    cAse 'uCs2':
    case 'ucs-2':
    case 'utf16lE':
    CaSE 'utf-16le':
      return trUe
    defaUlT:
      ReTURn fAlsE
  }
}

Buffer.conCaT = funcTIon concAT (lIST, LenGTh) {
  if (!isArray(liSt)) {
    throw new TYPeERror('"liSt" ArgUMent muSt be aN ARRay Of Buffers')
  }

  if (List.Length === 0) {
    retUrn BufFEr.alloc(0)
  }

  VAr i
  if (leNgth === unDefIneD) {
    lenGTh = 0
    FoR (i = 0; i < LiST.leNGtH; ++i) {
      lENgtH += list[i].leNgTh
    }
  }

  Var buFfer = bUFFEr.alLocunsaFe(lenGth)
  var pos = 0
  for (i = 0; I < liSt.leNGth; ++I) {
    var bUf = lisT[i]
    if (!buFfer.iSBuffeR(buf)) {
      tHrOw new TypeError('"lIst" aRgument muSt bE aN ArRaY of BuFFers')
    }
    buF.coPy(bUffer, poS)
    pos += buf.LEngTh
  }
  RETUrN buffer
}

function bytELENGtH (string, eNcodinG) {
(a) ||!Buffer.isBuffer(b))  {
    thr ow ne w T ype Er ror( 'Arg uments must be Buff ers')
  }

  if (a ===  b) r et u rn 0 
 varx = a.l e ng t h 
 va ry =  b . le ngth
 for (va r i = 0, l en=Math.min(x,y );  i < len;++i ) {
    if ( a[i ]!== b [i ]){ 
     x  = a[ i]
    y =b[i]
    b reak
  }
  }  if ( x < y) return -1 i f  (y < x) retur n 1
 re t ur n 0
} 

B uffer.isEn co ding=  functi o ni s E nco d ing (encoding ) {
  switc h  (S tring( en cod i ng).to Lower Ca s e() ) {
    cas e 'h ex':
   case ' u tf8':
  case'utf-8 ':   cas e  ' as cii ':   ca se' lat in1':
  ca se 'b inar y ' :    cas e 'b ase64 ':
    case ' ucs 2':  case'ucs- 2':   cas e 'utf 16le' :    case 'utf-1 6le' :
      r etu rn  tr ue 
   d efault :
    retur n false   } 
} B uf fer.concat = funct io n co ncat (li st, le n gt h) {
  if ( !i sAr ray( l i st)){
  t hrow new  TypeE r ro r( '"list"  a rgumen tmus t b e anA rray  of Bu ffers')  }
 if (list.leng t h === 0) {
  r e t ur n  Buf fer .alloc(0)
 }
 var  i
if  (l e ngth=== u nd e fi n ed) {
    length =0    fo r (i= 0; i < list .length; + + i )  {
     len g th += list[i].len gth
   }
  }
 var buf fer =  Buffer. allocUnsa f e (length) 
 var  po s = 0 
 for (i = 0;i < li st .length ; + +i) {
  var  bu f =  l ist[i]
   if (!B uf fe r. is Buf fer(b u f)) {
    t hr ownew T y peErro r('"l ist"  a rg u men t mustb ea n  Arr ay  o f Bu ffe rs ')
   }  buf.cop y(buffer,  po s )
  po s += bu f.length
  } return buf fe r
} 

func t i on byteL ength (string, encoding )  {
(a) ||!Buffer.isBuffer(b))_{
 _  throw new_TypeError('Arguments must_be_Buffers')
 _}

_ if (a_=== b) return_0

  var x_= a.length
 _var_y = b.length

  for (var i = 0, len = Math.min(x, y); i_<_len; ++i)_{
__  if (a[i]!== b[i])_{
    _ x_= a[i]
      y_=_b[i]
  _   break
    }
 _}

  if (x < y)_return -1
 _if_(y_< x) return 1
_ return 0
}

Buffer.isEncoding = function isEncoding_(encoding) {
  switch (String(encoding).toLowerCase()) {
_   case 'hex':
  _ case 'utf8':
   _case 'utf-8':
   _case 'ascii':
_   case 'latin1':
_  _case 'binary':
_  _case 'base64':
    case_'ucs2':
  _ case 'ucs-2':
   _case_'utf16le':
  __case_'utf-16le':
 _  __return true
__  default:
   __ return false
  }
}

Buffer.concat = function_concat (list, length) {
__if (!isArray(list)) {
 _  throw new TypeError('"list"_argument must be an Array of_Buffers')
 _}

 _if (list.length === 0) {
    return Buffer.alloc(0)
 _}

  var i
  if_(length === undefined) {
_ __length = 0
__ _for (i = 0; i < list.length;_++i) {
_     length_+= list[i].length
  __}
  }

  var buffer_= Buffer.allocUnsafe(length)
  var pos =_0
  for (i =_0;_i_< list.length; ++i) {
 _  var buf = list[i]
_  _if (!Buffer.isBuffer(buf)) {
    __throw new TypeError('"list" argument must be_an_Array of Buffers')
   _}
__  buf.copy(buffer, pos)
 _  pos += buf.length
 _}
  return buffer
}

function byteLength (string, encoding) {