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 // SerializeUint128 writes the first 96 bits of |v| in little-endian form 50 // to |out|. 51 static void SerializeUint128Short(uint128 v, uint8* out); 52 53 // Returns the name of the QuicRstStreamErrorCode as a char* 54 static const char* StreamErrorToString(QuicRstStreamErrorCode error); 55 56 // Returns the name of the QuicErrorCode as a char* 57 static const char* ErrorToString(QuicErrorCode error); 58 59 // Returns the level of encryption as a char* 60 static const char* EncryptionLevelToString(EncryptionLevel level); 61 62 // Returns TransmissionType as a char* 63 static const char* TransmissionTypeToString(TransmissionType type); 64 65 // TagToString is a utility function for pretty-printing handshake messages 66 // that converts a tag to a string. It will try to maintain the human friendly 67 // name if possible (i.e. kABCD -> "ABCD"), or will just treat it as a number 68 // if not. 69 static std::string TagToString(QuicTag tag); 70 71 // Given a binary buffer, return a hex+ASCII dump in the style of 72 // tcpdump's -X and -XX options: 73 // "0x0000: 0090 69bd 5400 000d 610f 0189 0800 4500 ..i.T...a.....E.\n" 74 // "0x0010: 001c fb98 4000 4001 7e18 d8ef 2301 455d ....@.@.~...#.E]\n" 75 // "0x0020: 7fe2 0800 6bcb 0bc6 806e ....k....n\n" 76 static std::string StringToHexASCIIDump(base::StringPiece in_buffer); 77 78 static char* AsChars(unsigned char* data) { 79 return reinterpret_cast<char*>(data); 80 } 81 82 static QuicPriority LowestPriority(); 83 84 static QuicPriority HighestPriority(); 85 86 private: 87 DISALLOW_COPY_AND_ASSIGN(QuicUtils); 88 }; 89 90 // Utility function that returns an IOVector object wrapped around |str|. 91 inline IOVector MakeIOVector(base::StringPiece str) { 92 IOVector iov; 93 iov.Append(const_cast<char*>(str.data()), str.size()); 94 return iov; 95 } 96 97 } // namespace net 98 99 #endif // NET_QUIC_QUIC_UTILS_H_ 100
