1 files changed, 53 insertions, 0 deletions
diff --git a/tools/mcuboot/imgtool/version.py b/tools/mcuboot/imgtool/version.py
new file mode 100644
index 00000000..030b012c
--- /dev/null
+++ b/tools/mcuboot/imgtool/version.py
@@ -0,0 +1,53 @@
+# Copyright 2017 Linaro Limited
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""
+Semi Semantic Versioning
+
+Implements a subset of semantic versioning that is supportable by the image
+header.
+"""
+
+from collections import namedtuple
+import re
+
+SemiSemVersion = namedtuple('SemiSemVersion', ['major', 'minor', 'revision',
+                                               'build'])
+
+version_re = re.compile(
+    r"""^([1-9]\d*|0)(\.([1-9]\d*|0)(\.([1-9]\d*|0)(\+([1-9]\d*|0))?)?)?$""")
+
+
+def decode_version(text):
+    """Decode the version string, which should be of the form maj.min.rev+build
+    """
+    m = version_re.match(text)
+    if m:
+        result = SemiSemVersion(
+            int(m.group(1)) if m.group(1) else 0,
+            int(m.group(3)) if m.group(3) else 0,
+            int(m.group(5)) if m.group(5) else 0,
+            int(m.group(7)) if m.group(7) else 0)
+        return result
+    else:
+        msg = "Invalid version number, should be maj.min.rev+build with later "
+        msg += "parts optional"
+        raise ValueError(msg)
+
+
+if __name__ == '__main__':
+    print(decode_version("1.2"))
+    print(decode_version("1.0"))
+    print(decode_version("0.0.2+75"))
+    print(decode_version("0.0.0+00"))