Adds a modified copy of talk/base to webrtc/base. It is the first step in migrating talk/base to webrtc/base.

BUG=N/A
R=andrew@webrtc.org, wu@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/12199004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6107 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/base/versionparsing.h

@@ -0,0 +1,35 @@
+/*
+ *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_BASE_VERSIONPARSING_H_
+#define WEBRTC_BASE_VERSIONPARSING_H_
+
+#include <string>
+
+namespace rtc {
+
+// Parses a version string into an array. "num_expected_segments" must be the
+// number of numerical segments that the version is expected to have (e.g.,
+// "1.1.2.0" has 4). "version" must be an array of that length to hold the
+// parsed numbers.
+// Returns "true" iff successful.
+bool ParseVersionString(const std::string& version_str,
+                        int num_expected_segments,
+                        int version[]);
+
+// Computes the lexicographical order of two versions. The return value
+// indicates the order in the standard way (e.g., see strcmp()).
+int CompareVersions(const int version1[],
+                    const int version2[],
+                    int num_segments);
+
+}  // namespace rtc
+
+#endif  // WEBRTC_BASE_VERSIONPARSING_H_