12     : ptr_(buf), end_(ptr_ + len) {}  in BigEndianReader()
15   if (ptr_ + len > end_)  in Skip()
17   ptr_ += len;  in Skip()
22   if (ptr_ + len > end_)  in ReadBytes()
24   memcpy(out, ptr_, len);  in ReadBytes()
25   ptr_ += len;  in ReadBytes()
30   if (ptr_ + len > end_)  in ReadPiece()
32   *out = base::StringPiece(ptr_, len);  in ReadPiece()
33   ptr_ += len;  in ReadPiece()
39   if (ptr_ + sizeof(T) > end_)  in Read()
41   ReadBigEndian<T>(ptr_, value);  in Read()
42   ptr_ += sizeof(T);  in Read()
63     : ptr_(buf), end_(ptr_ + len) {}  in BigEndianWriter()
66   if (ptr_ + len > end_)  in Skip()
68   ptr_ += len;  in Skip()
73   if (ptr_ + len > end_)  in WriteBytes()
75   memcpy(ptr_, buf, len);  in WriteBytes()
76   ptr_ += len;  in WriteBytes()
82   if (ptr_ + sizeof(T) > end_)  in Write()
84   WriteBigEndian<T>(ptr_, value);  in Write()
85   ptr_ += sizeof(T);  in Write()