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Side by Side Diff: net/quic/port_suggester.cc

Issue 266243004: Clang format slam. Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: Created 6 years, 7 months ago
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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), previous_suggestion_(-1) {
14 previous_suggestion_(-1) {
15 unsigned char hash_bytes[base::kSHA1Length]; 14 unsigned char hash_bytes[base::kSHA1Length];
16 base::SHA1HashBytes( 15 base::SHA1HashBytes(
17 reinterpret_cast<const unsigned char*>(server.host().data()), 16 reinterpret_cast<const unsigned char*>(server.host().data()),
18 server.host().length(), hash_bytes); 17 server.host().length(),
18 hash_bytes);
19 COMPILE_ASSERT(sizeof(seed_) < sizeof(hash_bytes), seed_larger_than_hash); 19 COMPILE_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];
30 base::SHA1HashBytes(reinterpret_cast<const unsigned char *>(&seed_), 30 base::SHA1HashBytes(reinterpret_cast<const unsigned char*>(&seed_),
31 sizeof(seed_), hash_bytes); 31 sizeof(seed_),
32 hash_bytes);
32 memcpy(&seed_, hash_bytes, sizeof(seed_)); 33 memcpy(&seed_, hash_bytes, sizeof(seed_));
33 } 34 }
34 DCHECK_LE(min, max); 35 DCHECK_LE(min, max);
35 DCHECK_GT(min, 0); 36 DCHECK_GT(min, 0);
36 int range = max - min + 1; 37 int range = max - min + 1;
37 // Ports (and hence the extent of the |range|) are generally under 2^16, so 38 // Ports (and hence the extent of the |range|) are generally under 2^16, so
38 // the tiny non-uniformity in the pseudo-random distribution is not 39 // the tiny non-uniformity in the pseudo-random distribution is not
39 // significant. 40 // significant.
40 previous_suggestion_ = static_cast<int>(seed_ % range) + min; 41 previous_suggestion_ = static_cast<int>(seed_ % range) + min;
41 return previous_suggestion_; 42 return previous_suggestion_;
42 } 43 }
43 44
44 int PortSuggester::previous_suggestion() const { 45 int PortSuggester::previous_suggestion() const {
45 DCHECK_LT(0u, call_count_); 46 DCHECK_LT(0u, call_count_);
46 return previous_suggestion_; 47 return previous_suggestion_;
47 } 48 }
48 49
49 } // namespace net 50 } // namespace net
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