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 #include "base/version.h" 6 7 #include <algorithm> 8 9 #include "base/logging.h" 10 #include "base/strings/string_number_conversions.h" 11 #include "base/strings/string_split.h" 12 #include "base/strings/string_util.h" 13 14 namespace base { 15 16 namespace { 17 18 // Parses the |numbers| vector representing the different numbers 19 // inside the version string and constructs a vector of valid integers. It stops 20 // when it reaches an invalid item (including the wildcard character). |parsed| 21 // is the resulting integer vector. Function returns true if all numbers were 22 // parsed successfully, false otherwise. 23 bool ParseVersionNumbers(const std::string& version_str, 24 std::vector<uint16>* parsed) { 25 std::vector<std::string> numbers; 26 SplitString(version_str, '.', &numbers); 27 if (numbers.empty()) 28 return false; 29 30 for (std::vector<std::string>::const_iterator it = numbers.begin(); 31 it != numbers.end(); ++it) { 32 int num; 33 if (!StringToInt(*it, &num)) 34 return false; 35 36 if (num < 0) 37 return false; 38 39 const uint16 max = 0xFFFF; 40 if (num > max) 41 return false; 42 43 // This throws out things like +3, or 032. 44 if (IntToString(num) != *it) 45 return false; 46 47 parsed->push_back(static_cast<uint16>(num)); 48 } 49 return true; 50 } 51 52 // Compares version components in |components1| with components in 53 // |components2|. Returns -1, 0 or 1 if |components1| is less than, equal to, 54 // or greater than |components2|, respectively. 55 int CompareVersionComponents(const std::vector<uint16>& components1, 56 const std::vector<uint16>& components2) { 57 const size_t count = std::min(components1.size(), components2.size()); 58 for (size_t i = 0; i < count; ++i) { 59 if (components1[i] > components2[i]) 60 return 1; 61 if (components1[i] < components2[i]) 62 return -1; 63 } 64 if (components1.size() > components2.size()) { 65 for (size_t i = count; i < components1.size(); ++i) { 66 if (components1[i] > 0) 67 return 1; 68 } 69 } else if (components1.size() < components2.size()) { 70 for (size_t i = count; i < components2.size(); ++i) { 71 if (components2[i] > 0) 72 return -1; 73 } 74 } 75 return 0; 76 } 77 78 } // namespace 79 80 Version::Version() { 81 } 82 83 Version::~Version() { 84 } 85 86 Version::Version(const std::string& version_str) { 87 std::vector<uint16> parsed; 88 if (!ParseVersionNumbers(version_str, &parsed)) 89 return; 90 91 components_.swap(parsed); 92 } 93 94 bool Version::IsValid() const { 95 return (!components_.empty()); 96 } 97 98 // static 99 bool Version::IsValidWildcardString(const std::string& wildcard_string) { 100 std::string version_string = wildcard_string; 101 if (EndsWith(wildcard_string.c_str(), ".*", false)) 102 version_string = wildcard_string.substr(0, wildcard_string.size() - 2); 103 104 Version version(version_string); 105 return version.IsValid(); 106 } 107 108 bool Version::IsOlderThan(const std::string& version_str) const { 109 Version proposed_ver(version_str); 110 if (!proposed_ver.IsValid()) 111 return false; 112 return (CompareTo(proposed_ver) < 0); 113 } 114 115 int Version::CompareToWildcardString(const std::string& wildcard_string) const { 116 DCHECK(IsValid()); 117 DCHECK(Version::IsValidWildcardString(wildcard_string)); 118 119 // Default behavior if the string doesn't end with a wildcard. 120 if (!EndsWith(wildcard_string.c_str(), ".*", false)) { 121 Version version(wildcard_string); 122 DCHECK(version.IsValid()); 123 return CompareTo(version); 124 } 125 126 std::vector<uint16> parsed; 127 const bool success = ParseVersionNumbers( 128 wildcard_string.substr(0, wildcard_string.length() - 2), &parsed); 129 DCHECK(success); 130 const int comparison = CompareVersionComponents(components_, parsed); 131 // If the version is smaller than the wildcard version's |parsed| vector, 132 // then the wildcard has no effect (e.g. comparing 1.2.3 and 1.3.*) and the 133 // version is still smaller. Same logic for equality (e.g. comparing 1.2.2 to 134 // 1.2.2.* is 0 regardless of the wildcard). Under this logic, 135 // 1.2.0.0.0.0 compared to 1.2.* is 0. 136 if (comparison == -1 || comparison == 0) 137 return comparison; 138 139 // Catch the case where the digits of |parsed| are found in |components_|, 140 // which means that the two are equal since |parsed| has a trailing "*". 141 // (e.g. 1.2.3 vs. 1.2.* will return 0). All other cases return 1 since 142 // components is greater (e.g. 3.2.3 vs 1.*). 143 DCHECK_GT(parsed.size(), 0UL); 144 const size_t min_num_comp = std::min(components_.size(), parsed.size()); 145 for (size_t i = 0; i < min_num_comp; ++i) { 146 if (components_[i] != parsed[i]) 147 return 1; 148 } 149 return 0; 150 } 151 152 bool Version::Equals(const Version& that) const { 153 DCHECK(IsValid()); 154 DCHECK(that.IsValid()); 155 return (CompareTo(that) == 0); 156 } 157 158 int Version::CompareTo(const Version& other) const { 159 DCHECK(IsValid()); 160 DCHECK(other.IsValid()); 161 return CompareVersionComponents(components_, other.components_); 162 } 163 164 const std::string Version::GetString() const { 165 DCHECK(IsValid()); 166 std::string version_str; 167 size_t count = components_.size(); 168 for (size_t i = 0; i < count - 1; ++i) { 169 version_str.append(IntToString(components_[i])); 170 version_str.append("."); 171 } 172 version_str.append(IntToString(components_[count - 1])); 173 return version_str; 174 } 175 176 } // namespace base 177
