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 <stddef.h> 8 9 #include <algorithm> 10 11 #include "base/logging.h" 12 #include "base/strings/string_number_conversions.h" 13 #include "base/strings/string_split.h" 14 #include "base/strings/string_util.h" 15 16 namespace base { 17 18 namespace { 19 20 // Parses the |numbers| vector representing the different numbers 21 // inside the version string and constructs a vector of valid integers. It stops 22 // when it reaches an invalid item (including the wildcard character). |parsed| 23 // is the resulting integer vector. Function returns true if all numbers were 24 // parsed successfully, false otherwise. 25 bool ParseVersionNumbers(const std::string& version_str, 26 std::vector<uint16>* parsed) { 27 std::vector<std::string> numbers; 28 SplitString(version_str, '.', &numbers); 29 if (numbers.empty()) 30 return false; 31 32 for (std::vector<std::string>::const_iterator it = numbers.begin(); 33 it != numbers.end(); ++it) { 34 int num; 35 if (!StringToInt(*it, &num)) 36 return false; 37 38 if (num < 0) 39 return false; 40 41 const uint16 max = 0xFFFF; 42 if (num > max) 43 return false; 44 45 // This throws out things like +3, or 032. 46 if (IntToString(num) != *it) 47 return false; 48 49 parsed->push_back(static_cast<uint16>(num)); 50 } 51 return true; 52 } 53 54 // Compares version components in |components1| with components in 55 // |components2|. Returns -1, 0 or 1 if |components1| is less than, equal to, 56 // or greater than |components2|, respectively. 57 int CompareVersionComponents(const std::vector<uint16>& components1, 58 const std::vector<uint16>& components2) { 59 const size_t count = std::min(components1.size(), components2.size()); 60 for (size_t i = 0; i < count; ++i) { 61 if (components1[i] > components2[i]) 62 return 1; 63 if (components1[i] < components2[i]) 64 return -1; 65 } 66 if (components1.size() > components2.size()) { 67 for (size_t i = count; i < components1.size(); ++i) { 68 if (components1[i] > 0) 69 return 1; 70 } 71 } else if (components1.size() < components2.size()) { 72 for (size_t i = count; i < components2.size(); ++i) { 73 if (components2[i] > 0) 74 return -1; 75 } 76 } 77 return 0; 78 } 79 80 } // namespace 81 82 Version::Version() { 83 } 84 85 Version::~Version() { 86 } 87 88 Version::Version(const std::string& version_str) { 89 std::vector<uint16> parsed; 90 if (!ParseVersionNumbers(version_str, &parsed)) 91 return; 92 93 components_.swap(parsed); 94 } 95 96 bool Version::IsValid() const { 97 return (!components_.empty()); 98 } 99 100 // static 101 bool Version::IsValidWildcardString(const std::string& wildcard_string) { 102 std::string version_string = wildcard_string; 103 if (EndsWith(wildcard_string.c_str(), ".*", false)) 104 version_string = wildcard_string.substr(0, wildcard_string.size() - 2); 105 106 Version version(version_string); 107 return version.IsValid(); 108 } 109 110 bool Version::IsOlderThan(const std::string& version_str) const { 111 Version proposed_ver(version_str); 112 if (!proposed_ver.IsValid()) 113 return false; 114 return (CompareTo(proposed_ver) < 0); 115 } 116 117 int Version::CompareToWildcardString(const std::string& wildcard_string) const { 118 DCHECK(IsValid()); 119 DCHECK(Version::IsValidWildcardString(wildcard_string)); 120 121 // Default behavior if the string doesn't end with a wildcard. 122 if (!EndsWith(wildcard_string.c_str(), ".*", false)) { 123 Version version(wildcard_string); 124 DCHECK(version.IsValid()); 125 return CompareTo(version); 126 } 127 128 std::vector<uint16> parsed; 129 const bool success = ParseVersionNumbers( 130 wildcard_string.substr(0, wildcard_string.length() - 2), &parsed); 131 DCHECK(success); 132 const int comparison = CompareVersionComponents(components_, parsed); 133 // If the version is smaller than the wildcard version's |parsed| vector, 134 // then the wildcard has no effect (e.g. comparing 1.2.3 and 1.3.*) and the 135 // version is still smaller. Same logic for equality (e.g. comparing 1.2.2 to 136 // 1.2.2.* is 0 regardless of the wildcard). Under this logic, 137 // 1.2.0.0.0.0 compared to 1.2.* is 0. 138 if (comparison == -1 || comparison == 0) 139 return comparison; 140 141 // Catch the case where the digits of |parsed| are found in |components_|, 142 // which means that the two are equal since |parsed| has a trailing "*". 143 // (e.g. 1.2.3 vs. 1.2.* will return 0). All other cases return 1 since 144 // components is greater (e.g. 3.2.3 vs 1.*). 145 DCHECK_GT(parsed.size(), 0UL); 146 const size_t min_num_comp = std::min(components_.size(), parsed.size()); 147 for (size_t i = 0; i < min_num_comp; ++i) { 148 if (components_[i] != parsed[i]) 149 return 1; 150 } 151 return 0; 152 } 153 154 bool Version::Equals(const Version& that) const { 155 DCHECK(IsValid()); 156 DCHECK(that.IsValid()); 157 return (CompareTo(that) == 0); 158 } 159 160 int Version::CompareTo(const Version& other) const { 161 DCHECK(IsValid()); 162 DCHECK(other.IsValid()); 163 return CompareVersionComponents(components_, other.components_); 164 } 165 166 const std::string Version::GetString() const { 167 DCHECK(IsValid()); 168 std::string version_str; 169 size_t count = components_.size(); 170 for (size_t i = 0; i < count - 1; ++i) { 171 version_str.append(IntToString(components_[i])); 172 version_str.append("."); 173 } 174 version_str.append(IntToString(components_[count - 1])); 175 return version_str; 176 } 177 178 } // namespace base 179
