Ensure that unsupported OSON versions raise an exception.

Author: anthony-tuininga

src/oracledb/errors.py

@@ -201,6 +201,7 @@ def _raise_from_string(exc_type: Exception, message: str) -> None:
 ERR_TDS_TYPE_NOT_SUPPORTED = 3018
 ERR_OSON_NODE_TYPE_NOT_SUPPORTED = 3019
 ERR_OSON_FIELD_NAME_LIMITATION = 3020
+ERR_OSON_VERSION_NOT_SUPPORTED = 3021
 
 # error numbers that result in DatabaseError
 ERR_TNS_ENTRY_NOT_FOUND = 4000
@@ -460,6 +461,8 @@ def _raise_from_string(exc_type: Exception, message: str) -> None:
             'OSON field names may not exceed 255 UTF-8 encoded bytes',
     ERR_OSON_NODE_TYPE_NOT_SUPPORTED:
             'OSON node type 0x{node_type:x} is not supported',
+    ERR_OSON_VERSION_NOT_SUPPORTED:
+            'OSON version {version} is not supported',
     ERR_POOL_HAS_BUSY_CONNECTIONS:
             'connection pool cannot be closed because connections are busy',
     ERR_POOL_NO_CONNECTION_AVAILABLE:

src/oracledb/impl/thin/oson.pyx

@@ -252,6 +252,9 @@ cdef class OsonDecoder(Buffer):
                 ptr[2] != TNS_JSON_MAGIC_BYTE_3:
             errors._raise_err(errors.ERR_UNEXPECTED_DATA, data=ptr[:3])
         self.read_ub1(&version)
+        if version != TNS_JSON_VERSION:
+            errors._raise_err(errors.ERR_OSON_VERSION_NOT_SUPPORTED,
+                              version=version)
         self.read_uint16(&self.flags)
 
         # if value is a scalar value, the header is much smaller