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1 // Copyright 2013 The Chromium Authors. All rights reserved. | 1 // Copyright 2013 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "net/quic/port_suggester.h" | 5 #include "net/quic/port_suggester.h" |
6 | 6 |
7 #include "base/logging.h" | 7 #include "base/logging.h" |
8 #include "net/base/host_port_pair.h" | 8 #include "net/base/host_port_pair.h" |
9 | 9 |
10 namespace net { | 10 namespace net { |
11 | 11 |
12 PortSuggester::PortSuggester(const HostPortPair& server, uint64 seed) | 12 PortSuggester::PortSuggester(const HostPortPair& server, uint64 seed) |
13 : call_count_(0), | 13 : call_count_(0), |
14 previous_suggestion_(-1) { | 14 previous_suggestion_(-1) { |
15 unsigned char hash_bytes[base::kSHA1Length]; | 15 unsigned char hash_bytes[base::kSHA1Length]; |
16 base::SHA1HashBytes( | 16 base::SHA1HashBytes( |
17 reinterpret_cast<const unsigned char*>(server.host().data()), | 17 reinterpret_cast<const unsigned char*>(server.host().data()), |
18 server.host().length(), hash_bytes); | 18 server.host().length(), hash_bytes); |
19 COMPILE_ASSERT(sizeof(seed_) < sizeof(hash_bytes), seed_larger_than_hash); | 19 static_assert(sizeof(seed_) < sizeof(hash_bytes), "seed larger than hash"); |
20 memcpy(&seed_, hash_bytes, sizeof(seed_)); | 20 memcpy(&seed_, hash_bytes, sizeof(seed_)); |
21 seed_ ^= seed ^ server.port(); | 21 seed_ ^= seed ^ server.port(); |
22 } | 22 } |
23 | 23 |
24 int PortSuggester::SuggestPort(int min, int max) { | 24 int PortSuggester::SuggestPort(int min, int max) { |
25 // Sometimes our suggestion can't be used, so we ensure that if additional | 25 // Sometimes our suggestion can't be used, so we ensure that if additional |
26 // calls are made, then each call (probably) provides a new suggestion. | 26 // calls are made, then each call (probably) provides a new suggestion. |
27 if (++call_count_ > 1) { | 27 if (++call_count_ > 1) { |
28 // Evolve the seed. | 28 // Evolve the seed. |
29 unsigned char hash_bytes[base::kSHA1Length]; | 29 unsigned char hash_bytes[base::kSHA1Length]; |
(...skipping 10 matching lines...) Expand all Loading... |
40 previous_suggestion_ = static_cast<int>(seed_ % range) + min; | 40 previous_suggestion_ = static_cast<int>(seed_ % range) + min; |
41 return previous_suggestion_; | 41 return previous_suggestion_; |
42 } | 42 } |
43 | 43 |
44 int PortSuggester::previous_suggestion() const { | 44 int PortSuggester::previous_suggestion() const { |
45 DCHECK_LT(0u, call_count_); | 45 DCHECK_LT(0u, call_count_); |
46 return previous_suggestion_; | 46 return previous_suggestion_; |
47 } | 47 } |
48 | 48 |
49 } // namespace net | 49 } // namespace net |
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