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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 //
      5 // Some helpers for quic
      6 
      7 #ifndef NET_QUIC_QUIC_UTILS_H_
      8 #define NET_QUIC_QUIC_UTILS_H_
      9 
     10 #include "net/base/int128.h"
     11 #include "net/base/net_export.h"
     12 #include "net/quic/quic_protocol.h"
     13 
     14 namespace net {
     15 
     16 class NET_EXPORT_PRIVATE QuicUtils {
     17  public:
     18   enum Priority {
     19     LOCAL_PRIORITY,
     20     PEER_PRIORITY,
     21   };
     22 
     23   // returns the 64 bit FNV1a hash of the data.  See
     24   // http://www.isthe.com/chongo/tech/comp/fnv/index.html#FNV-param
     25   static uint64 FNV1a_64_Hash(const char* data, int len);
     26 
     27   // returns the 128 bit FNV1a hash of the data.  See
     28   // http://www.isthe.com/chongo/tech/comp/fnv/index.html#FNV-param
     29   static uint128 FNV1a_128_Hash(const char* data, int len);
     30 
     31   // FindMutualTag sets |out_result| to the first tag in the priority list that
     32   // is also in the other list and returns true. If there is no intersection it
     33   // returns false.
     34   //
     35   // Which list has priority is determined by |priority|.
     36   //
     37   // If |out_index| is non-NULL and a match is found then the index of that
     38   // match in |their_tags| is written to |out_index|.
     39   static bool FindMutualTag(const QuicTagVector& our_tags,
     40                             const QuicTag* their_tags,
     41                             size_t num_their_tags,
     42                             Priority priority,
     43                             QuicTag* out_result,
     44                             size_t* out_index);
     45 
     46   // SerializeUint128 writes |v| in little-endian form to |out|.
     47   static void SerializeUint128(uint128 v, uint8* out);
     48 
     49   // ParseUint128 parses a little-endian uint128 from |in| and returns it.
     50   static uint128 ParseUint128(const uint8* in);
     51 
     52   // Returns the name of the QuicRstStreamErrorCode as a char*
     53   static const char* StreamErrorToString(QuicRstStreamErrorCode error);
     54 
     55   // Returns the name of the QuicErrorCode as a char*
     56   static const char* ErrorToString(QuicErrorCode error);
     57 
     58   // Returns the level of encryption as a char*
     59   static const char* EncryptionLevelToString(EncryptionLevel level);
     60 
     61   // TagToString is a utility function for pretty-printing handshake messages
     62   // that converts a tag to a string. It will try to maintain the human friendly
     63   // name if possible (i.e. kABCD -> "ABCD"), or will just treat it as a number
     64   // if not.
     65   static std::string TagToString(QuicTag tag);
     66 
     67   // Given a binary buffer, return a hex+ASCII dump in the style of
     68   // tcpdump's -X and -XX options:
     69   // "0x0000:  0090 69bd 5400 000d 610f 0189 0800 4500  ..i.T...a.....E.\n"
     70   // "0x0010:  001c fb98 4000 4001 7e18 d8ef 2301 455d  ....@.@.~...#.E]\n"
     71   // "0x0020:  7fe2 0800 6bcb 0bc6 806e                 ....k....n\n"
     72   static std::string StringToHexASCIIDump(base::StringPiece in_buffer);
     73 
     74   static char* AsChars(unsigned char* data) {
     75     return reinterpret_cast<char*>(data);
     76   }
     77 };
     78 
     79 }  // namespace net
     80 
     81 #endif  // NET_QUIC_QUIC_UTILS_H_
     82