Repo created

TMessagesProj/jni/voip/webrtc/base/version.cc

@@ -0,0 +1,194 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/version.h"
+
+#include <stddef.h>
+
+#include <algorithm>
+
+#include "base/logging.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/string_split.h"
+#include "base/strings/string_util.h"
+
+namespace base {
+
+namespace {
+
+// Parses the |numbers| vector representing the different numbers
+// inside the version string and constructs a vector of valid integers. It stops
+// when it reaches an invalid item (including the wildcard character). |parsed|
+// is the resulting integer vector. Function returns true if all numbers were
+// parsed successfully, false otherwise.
+bool ParseVersionNumbers(StringPiece version_str,
+                         std::vector<uint32_t>* parsed) {
+  std::vector<StringPiece> numbers =
+      SplitStringPiece(version_str, ".", KEEP_WHITESPACE, SPLIT_WANT_ALL);
+  if (numbers.empty())
+    return false;
+
+  for (auto it = numbers.begin(); it != numbers.end(); ++it) {
+    if (StartsWith(*it, "+", CompareCase::SENSITIVE))
+      return false;
+
+    unsigned int num;
+    if (!StringToUint(*it, &num))
+      return false;
+
+    // This throws out leading zeros for the first item only.
+    if (it == numbers.begin() && NumberToString(num) != *it)
+      return false;
+
+    // StringToUint returns unsigned int but Version fields are uint32_t.
+    static_assert(sizeof (uint32_t) == sizeof (unsigned int),
+        "uint32_t must be same as unsigned int");
+    parsed->push_back(num);
+  }
+  return true;
+}
+
+// Compares version components in |components1| with components in
+// |components2|. Returns -1, 0 or 1 if |components1| is less than, equal to,
+// or greater than |components2|, respectively.
+int CompareVersionComponents(const std::vector<uint32_t>& components1,
+                             const std::vector<uint32_t>& components2) {
+  const size_t count = std::min(components1.size(), components2.size());
+  for (size_t i = 0; i < count; ++i) {
+    if (components1[i] > components2[i])
+      return 1;
+    if (components1[i] < components2[i])
+      return -1;
+  }
+  if (components1.size() > components2.size()) {
+    for (size_t i = count; i < components1.size(); ++i) {
+      if (components1[i] > 0)
+        return 1;
+    }
+  } else if (components1.size() < components2.size()) {
+    for (size_t i = count; i < components2.size(); ++i) {
+      if (components2[i] > 0)
+        return -1;
+    }
+  }
+  return 0;
+}
+
+}  // namespace
+
+Version::Version() = default;
+
+Version::Version(const Version& other) = default;
+
+Version::~Version() = default;
+
+Version::Version(StringPiece version_str) {
+  std::vector<uint32_t> parsed;
+  if (!ParseVersionNumbers(version_str, &parsed))
+    return;
+
+  components_.swap(parsed);
+}
+
+Version::Version(std::vector<uint32_t> components)
+    : components_(std::move(components)) {}
+
+bool Version::IsValid() const {
+  return (!components_.empty());
+}
+
+// static
+bool Version::IsValidWildcardString(StringPiece wildcard_string) {
+  StringPiece version_string = wildcard_string;
+  if (EndsWith(version_string, ".*", CompareCase::SENSITIVE))
+    version_string = version_string.substr(0, version_string.size() - 2);
+
+  Version version(version_string);
+  return version.IsValid();
+}
+
+int Version::CompareToWildcardString(StringPiece wildcard_string) const {
+  DCHECK(IsValid());
+  DCHECK(Version::IsValidWildcardString(wildcard_string));
+
+  // Default behavior if the string doesn't end with a wildcard.
+  if (!EndsWith(wildcard_string, ".*", CompareCase::SENSITIVE)) {
+    Version version(wildcard_string);
+    DCHECK(version.IsValid());
+    return CompareTo(version);
+  }
+
+  std::vector<uint32_t> parsed;
+  const bool success = ParseVersionNumbers(
+      wildcard_string.substr(0, wildcard_string.length() - 2), &parsed);
+  DCHECK(success);
+  const int comparison = CompareVersionComponents(components_, parsed);
+  // If the version is smaller than the wildcard version's |parsed| vector,
+  // then the wildcard has no effect (e.g. comparing 1.2.3 and 1.3.*) and the
+  // version is still smaller. Same logic for equality (e.g. comparing 1.2.2 to
+  // 1.2.2.* is 0 regardless of the wildcard). Under this logic,
+  // 1.2.0.0.0.0 compared to 1.2.* is 0.
+  if (comparison == -1 || comparison == 0)
+    return comparison;
+
+  // Catch the case where the digits of |parsed| are found in |components_|,
+  // which means that the two are equal since |parsed| has a trailing "*".
+  // (e.g. 1.2.3 vs. 1.2.* will return 0). All other cases return 1 since
+  // components is greater (e.g. 3.2.3 vs 1.*).
+  DCHECK_GT(parsed.size(), 0UL);
+  const size_t min_num_comp = std::min(components_.size(), parsed.size());
+  for (size_t i = 0; i < min_num_comp; ++i) {
+    if (components_[i] != parsed[i])
+      return 1;
+  }
+  return 0;
+}
+
+int Version::CompareTo(const Version& other) const {
+  DCHECK(IsValid());
+  DCHECK(other.IsValid());
+  return CompareVersionComponents(components_, other.components_);
+}
+
+std::string Version::GetString() const {
+  DCHECK(IsValid());
+  std::string version_str;
+  size_t count = components_.size();
+  for (size_t i = 0; i < count - 1; ++i) {
+    version_str.append(NumberToString(components_[i]));
+    version_str.append(".");
+  }
+  version_str.append(NumberToString(components_[count - 1]));
+  return version_str;
+}
+
+bool operator==(const Version& v1, const Version& v2) {
+  return v1.CompareTo(v2) == 0;
+}
+
+bool operator!=(const Version& v1, const Version& v2) {
+  return !(v1 == v2);
+}
+
+bool operator<(const Version& v1, const Version& v2) {
+  return v1.CompareTo(v2) < 0;
+}
+
+bool operator<=(const Version& v1, const Version& v2) {
+  return v1.CompareTo(v2) <= 0;
+}
+
+bool operator>(const Version& v1, const Version& v2) {
+  return v1.CompareTo(v2) > 0;
+}
+
+bool operator>=(const Version& v1, const Version& v2) {
+  return v1.CompareTo(v2) >= 0;
+}
+
+std::ostream& operator<<(std::ostream& stream, const Version& v) {
+  return stream << v.GetString();
+}
+
+}  // namespace base