.

wcfs/testprog/wcfs_commit_tree_deltas.py

@@ -63,6 +63,29 @@ def init(zstor):
 
     transaction.commit()
 
+
+# kvEncode encodes key->value maping into text.
+# e.g. {1:'a', 2:'b'} -> '1:a,2:b'
+def kvEncode(kvDict, vencode): # -> kvText
+    retv = []
+    for k in sorted(kvDict.keys()):
+        v = kvDict[k]
+        retv.append('%d:%s' % (k, vencode(v)))
+    return ','.join(retv)
+
+# kvDecode decodes key->value mapping from text.
+# e.g. '1:a,2:b' -> {1:'a', 2:'b'}
+def kvDecode(kvText, vdecode): # -> kvDict
+    kv = {}
+    for item in kvText.split(','):
+        ktxt, vtxt = item.split(':')
+        k = int(ktxt)
+        v = vdecode(vtxt)
+        if k in kv:
+            raise ValueError("key %s present multiple times" % k)
+        kv[k] = v
+    return kv
+
 # XXX
 #
 # kv: k₁:v₁,k₂:v₂,...