1 files changed, 39 insertions, 2 deletions
diff --git a/azurelinuxagent/common/utils/textutil.py b/azurelinuxagent/common/utils/textutil.py
index f03c7e6..59b8fe7 100644
--- a/azurelinuxagent/common/utils/textutil.py
+++ b/azurelinuxagent/common/utils/textutil.py
@@ -251,8 +251,14 @@ def set_ini_config(config, name, val):
 
 
 def remove_bom(c):
-    if str_to_ord(c[0]) > 128 and str_to_ord(c[1]) > 128 and \
-                    str_to_ord(c[2]) > 128:
+    '''
+    bom is comprised of a sequence of three chars,0xef, 0xbb, 0xbf, in case of utf-8.
+    '''
+    if not is_str_none_or_whitespace(c) and \
+       len(c) > 2 and \
+       str_to_ord(c[0]) > 128 and \
+       str_to_ord(c[1]) > 128 and \
+       str_to_ord(c[2]) > 128:
         c = c[3:]
     return c
 
@@ -277,3 +283,34 @@ def b64encode(s):
     if PY_VERSION_MAJOR > 2:
         return base64.b64encode(bytes(s, 'utf-8')).decode('utf-8')
     return base64.b64encode(s)
+
+
+def b64decode(s):
+    from azurelinuxagent.common.version import PY_VERSION_MAJOR
+    if PY_VERSION_MAJOR > 2:
+        return base64.b64decode(s).decode('utf-8')
+    return base64.b64decode(s)
+
+
+def safe_shlex_split(s):
+    import shlex
+    from azurelinuxagent.common.version import PY_VERSION
+    if PY_VERSION[:2] == (2, 6):
+        return shlex.split(s.encode('utf-8'))
+    return shlex.split(s)
+
+
+def parse_json(json_str):
+    """
+    Parse json string and return a resulting dictionary
+    """
+    # trim null and whitespaces
+    result = None
+    if not is_str_none_or_whitespace(json_str):
+        import json
+        result = json.loads(json_str.rstrip(' \t\r\n\0'))
+
+    return result
+
+def is_str_none_or_whitespace(s):
+    return s is None or len(s) == 0 or s.isspace()