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 // TagToString is a utility function for pretty-printing handshake messages
63 // that converts a tag to a string. It will try to maintain the human friendly
64 // name if possible (i.e. kABCD -> "ABCD"), or will just treat it as a number
65 // if not.
66 static std::string TagToString(QuicTag tag);
67
68 // Given a binary buffer, return a hex+ASCII dump in the style of
69 // tcpdump's -X and -XX options:
70 // "0x0000: 0090 69bd 5400 000d 610f 0189 0800 4500 ..i.T...a.....E.\n"
71 // "0x0010: 001c fb98 4000 4001 7e18 d8ef 2301 455d ....@.@.~...#.E]\n"
72 // "0x0020: 7fe2 0800 6bcb 0bc6 806e ....k....n\n"
73 static std::string StringToHexASCIIDump(base::StringPiece in_buffer);
74
AsChars(unsigned char * data)75 static char* AsChars(unsigned char* data) {
76 return reinterpret_cast<char*>(data);
77 }
78
79 static QuicPriority LowestPriority();
80
81 static QuicPriority HighestPriority();
82 };
83
84 // Utility function that returns an IOVector object wrapped around |str|.
MakeIOVector(base::StringPiece str)85 inline IOVector MakeIOVector(base::StringPiece str) {
86 IOVector iov;
87 iov.Append(const_cast<char*>(str.data()), str.size());
88 return iov;
89 }
90
91 } // namespace net
92
93 #endif // NET_QUIC_QUIC_UTILS_H_
94