Add feature from request #75:

- only create xmldsig framgnets which are listed (like other fragments)
- remove unused fields for optimization (per default remove "shall not be used" from standard)
removed elements are not in structure and will result in en/decoder error NOT_IMPLEMENTED when "isUsed" flag is set.

Author: Michael Mezger

src/cbexigen/SchemaAnalyzer.py

@@ -992,6 +992,7 @@ def analyze_schema_elements(self):
         # Check memory option and make optimization
         if self.config['apply_optimizations'] == 1:
             self.__apply_array_optimizations()
+            self.__mark_field_optimizations()
 
         # Do the preparations for type generation
         self.__prepare_for_type_generation()
@@ -1552,6 +1553,24 @@ def __apply_array_optimizations(self):
                     particle.max_occurs = optimizations[particle.type_short]
                     particle.max_occurs_changed = True
 
+    def __mark_field_optimizations(self):
+        config_module = get_config_module()
+        parameter = self.__schema_prefix + 'field_optimizations'
+        if hasattr(config_module, parameter):
+            optimizations = getattr(config_module, parameter)
+        else:
+            return
+
+        for element in self.__generate_elements:
+            if element.name_short in optimizations.keys() and len(optimizations[element.name_short]) == 0:
+                msg_write(f"Optimized element: {element.name_short}")
+
+            for particle in element.particles:
+                if particle.name in optimizations.keys():
+                    if len(optimizations[particle.name]) == 0 or element.name_short in optimizations[particle.name]:
+                        particle.is_optimized = True
+                        msg_write(f"Optimized particle: {particle.name} in element: {element.name}")
+
     def __prepare_for_type_generation(self):
         # Sort the list of elements to be generated by level and count
         self.__generate_elements.sort(key=lambda item: item.count, reverse=False)

src/cbexigen/datatype_classes.py

@@ -36,6 +36,12 @@ def __init__(self, current_scheme: XMLSchema11, parameters, analyzer_data: Analy
             self.__fragments = get_fragment_parameter_for_schema(self.__schema_prefix)
             self.__generate_fragment = len(self.__fragments) > 0
 
+        self.__xmldsigfragments = []
+        self.__generate_all_xmldsig_fragment = True
+        if self.config['generate_fragments'] == 1:
+            self.__xmldsigfragments = get_fragment_parameter_for_schema('xmldsig_')
+            self.__generate_all_xmldsig_fragment = len(self.__xmldsigfragments) == 0
+
         if self.logging_enabled:
             self.logger_name = str(self.h_params['filename'])
             if self.logger_name.casefold().endswith('.h') or self.logger_name.casefold().endswith('.c'):
@@ -276,12 +282,19 @@ def __generate_sequence_content(self, name, comment, content, indent_level=1):
         return temp.render(indent=indent, level=indent_level,
                            sequence_comment=comment, sequence_name=name, sequence_content=content)
 
+    def __generate_optimized_struct(self, name, comment, indent_level=1):
+        indent = ' ' * self.config['c_code_indent_chars']
+        temp = self.generator.get_template('SubStructOptimized.jinja')
+        return temp.render(indent=indent, level=indent_level, name=name, comment=comment)
+
     def __get_particle_content(self, particle: Particle, elements, indent_level=1):
         content = ''
         last = None
 
+        if particle.is_optimized is True:
+            content += self.__generate_optimized_struct(particle.name, ": Optimized out element", indent_level)
         # particle type is in list, so a separate type is generated
-        if particle.type in self.analyzer_data.known_elements:
+        elif particle.type in self.analyzer_data.known_elements:
             if particle.max_occurs > 1:
                 # generate struct for array with length variable
                 if particle.is_enum:
@@ -449,7 +462,7 @@ def __get_xmldsig_fragment_content(self):
 
         fragment: FragmentData
         for fragment in self.analyzer_data.known_fragments.values():
-            if 'xmldsig' in fragment.namespace.casefold():
+            if 'xmldsig' in fragment.namespace.casefold() and (fragment.name in self.__xmldsigfragments or self.__generate_all_xmldsig_fragment is True):
                 fragment_type = fragment.type
                 if fragment.type == 'AnonType':
                     fragment_type = fragment.name
@@ -460,6 +473,8 @@ def __get_xmldsig_fragment_content(self):
                 else:
                     self.log(f'xmldsig Fragment {fragment.name} ({fragment.type}) '
                              f'is not in the list of known elements.')
+            else:
+                self.log(f"Skipped xmlsigFragment: {fragment.name}")
 
         temp = self.generator.get_template('BaseStructWithUnionAndUsed.jinja')
         content = temp.render(struct_name=name,
@@ -657,6 +672,12 @@ def __init__(self, current_scheme, parameters, analyzer_data: AnalyzerData, enab
             self.__fragments = get_fragment_parameter_for_schema(self.__schema_prefix)
             self.__generate_fragment = len(self.__fragments) > 0
 
+        self.__xmldsigfragments = []
+        self.__generate_all_xmldsig_fragment = True
+        if self.config['generate_fragments'] == 1:
+            self.__xmldsigfragments = get_fragment_parameter_for_schema('xmldsig_')
+            self.__generate_all_xmldsig_fragment = len(self.__xmldsigfragments) == 0
+
         if self.logging_enabled:
             self.logger_name = str(self.c_params['filename'])
             if self.logger_name.casefold().endswith('.h') or self.logger_name.casefold().endswith('.c'):
@@ -789,7 +810,7 @@ def __get_xmldsig_fragment_content(self):
 
         fragment: FragmentData
         for fragment in self.analyzer_data.known_fragments.values():
-            if 'xmldsig' in fragment.namespace.casefold():
+            if 'xmldsig' in fragment.namespace.casefold() and (fragment.name in self.__xmldsigfragments or self.__generate_all_xmldsig_fragment is True):
                 fragment_type = fragment.type
                 if fragment.type == 'AnonType':
                     fragment_type = fragment.name

src/cbexigen/decoder_classes.py

@@ -28,6 +28,12 @@ def __init__(self, parameters, enable_logging=True):
             self.__fragments = get_fragment_parameter_for_schema(self.__schema_prefix)
             self.__generate_fragment = len(self.__fragments) > 0
 
+        self.__xmldsigfragments = []
+        self.__generate_all_xmldsig_fragment = True
+        if self.config['generate_fragments'] == 1:
+            self.__xmldsigfragments = get_fragment_parameter_for_schema('xmldsig_')
+            self.__generate_all_xmldsig_fragment = len(self.__xmldsigfragments) == 0
+
         self.__include_content = ''
         self.__code_content = ''
 
@@ -102,6 +108,11 @@ def __init__(self, parameters, analyzer_data, enable_logging=True):
         if self.config['generate_fragments'] == 1:
             self.__fragments = get_fragment_parameter_for_schema(self.__schema_prefix)
             self.__generate_fragment = len(self.__fragments) > 0
+        self.__xmldsigfragments = []
+        self.__generate_all_xmldsig_fragment = True
+        if self.config['generate_fragments'] == 1:
+            self.__xmldsigfragments = get_fragment_parameter_for_schema('xmldsig_')
+            self.__generate_all_xmldsig_fragment = len(self.__xmldsigfragments) == 0
 
         self.__include_content = ''
         self.__code_content = ''
@@ -511,6 +522,14 @@ def __get_content_decode_not_implemented(self, element_typename, detail: Element
 
         return decode_content
 
+    def __get_content_decode_optimized_out(self, element_typename, detail: ElementGrammarDetail, level):
+        decode_comment = f"// decode removed with optimization: '{detail.particle.type_short}', base type '{detail.particle.typename}"
+        temp = self.generator.get_template('DecodeTypeNotImplemented.jinja')
+        decode_content = temp.render(decode_comment=decode_comment,
+                                     indent=self.indent, level=level)
+
+        return decode_content
+
     def __get_type_content(self, grammar: ElementGrammar, detail: ElementGrammarDetail, level):
         if detail.particle is None:
             temp = self.generator.get_template('BaseDecodeEndElement.jinja')
@@ -519,7 +538,10 @@ def __get_type_content(self, grammar: ElementGrammar, detail: ElementGrammarDeta
         # default content for types not covered below
         type_content = self.__get_content_decode_not_implemented(grammar.element_typename, detail, level)
 
-        if detail.is_any and detail.any_is_dummy:
+        if detail.particle.is_optimized is True:
+            # use "not implemented" content when optimized
+            type_content = self.__get_content_decode_optimized_out(grammar.element_typename, detail, level)
+        elif detail.is_any and detail.any_is_dummy:
             type_content = self.__get_content_decode_no_event(grammar.element_typename, detail, level)
         elif detail.particle.is_enum:
             if detail.particle.is_array:
@@ -870,7 +892,7 @@ def __get_xmldsig_fragment_content(self):
 
         decode_fn = []
         for fragment in self.analyzer_data.known_fragments.values():
-            if 'xmldsig' in fragment.namespace.casefold():
+            if 'xmldsig' in fragment.namespace.casefold() and (fragment.name in self.__xmldsigfragments or self.__generate_all_xmldsig_fragment is True):
                 if fragment.type in self.analyzer_data.known_elements.values():
                     function = f'{CONFIG_PARAMS["decode_function_prefix"]}{self.__schema_prefix}{fragment.type}'
                     parameter = f'{parameter_name}->{fragment.name}'

src/cbexigen/elementData.py

@@ -35,6 +35,7 @@ class Particle:
     is_enum: bool = False
     is_attribute: bool = False
     is_simple_content: bool = False
+    is_optimized: bool = False
     enum_count: int = -1
     # additional flag if content model is choice and changed min occurrence
     content_model_changed_restrictions: bool = False

src/cbexigen/encoder_classes.py

@@ -28,6 +28,12 @@ def __init__(self, parameters, enable_logging=True):
             self.__fragments = get_fragment_parameter_for_schema(self.__schema_prefix)
             self.__generate_fragment = len(self.__fragments) > 0
 
+        self.__xmldsigfragments = []
+        self.__generate_all_xmldsig_fragment = True
+        if self.config['generate_fragments'] == 1:
+            self.__xmldsigfragments = get_fragment_parameter_for_schema('xmldsig_')
+            self.__generate_all_xmldsig_fragment = len(self.__xmldsigfragments) == 0
+
         self.__include_content = ''
         self.__code_content = ''
 
@@ -103,6 +109,12 @@ def __init__(self, parameters, analyzer_data, enable_logging=True):
             self.__fragments = get_fragment_parameter_for_schema(self.__schema_prefix)
             self.__generate_fragment = len(self.__fragments) > 0
 
+        self.__xmldsigfragments = []
+        self.__generate_all_xmldsig_fragment = True
+        if self.config['generate_fragments'] == 1:
+            self.__xmldsigfragments = get_fragment_parameter_for_schema('xmldsig_')
+            self.__generate_all_xmldsig_fragment = len(self.__xmldsigfragments) == 0
+
         self.__include_content = ''
         self.__code_content = ''
         self.__function_content = ''
@@ -531,7 +543,7 @@ def __get_event_content_for_optional_element(self, detail: ElementGrammarDetail,
         if detail.flag == GrammarFlag.END:
             content += self.__get_event_content_for_end_element(detail, grammar.bits_to_write, False, level)
         else:
-            if detail.particle is not None and not (detail.is_any and detail.any_is_dummy):
+            if detail.particle is not None and not (detail.is_any and detail.any_is_dummy) and detail.particle.is_optimized is False:
                 if detail.is_extra_grammar:
                     option = -2
 
@@ -557,6 +569,15 @@ def __get_event_content_for_optional_element(self, detail: ElementGrammarDetail,
                                        add_debug_code=self.get_status_for_add_debug_code(detail.particle.prefixed_name),
                                        type_parameter=type_parameter,
                                        indent=self.indent, level=level)
+            elif detail.particle.is_optimized is True:
+                parameter = grammar.element_typename + '->' + detail.particle.name
+                event_comment = f'// Event optimized out: {detail.particle_name} (index={detail.event_index}); next={detail.next_grammar}'
+                temp = self.generator.get_template('EncodeEventOptionalElementOptimized.jinja')
+                content += temp.render(option=option,
+                                       parameter=parameter,
+                                       event_comment=event_comment,
+                                       indent=self.indent, level=level)
+
             else:
                 # unsupported particle which appears in the event list
                 if detail.is_any and detail.any_is_dummy:
@@ -885,7 +906,7 @@ def __get_xmldsig_fragment_content(self):
 
         encode_fn = []
         for fragment in self.analyzer_data.known_fragments.values():
-            if 'xmldsig' in fragment.namespace.casefold():
+            if 'xmldsig' in fragment.namespace.casefold() and (fragment.name in self.__xmldsigfragments or self.__generate_all_xmldsig_fragment is True):
                 if fragment.type in self.analyzer_data.known_elements.values():
                     function = f'{CONFIG_PARAMS["encode_function_prefix"]}{self.__schema_prefix}{fragment.type}'
                     parameter = f'{parameter_name}->{fragment.name}'

src/config.py

@@ -76,6 +76,28 @@
     'ParameterType': 8
 }
 
+# optimizations for fields, which shall be excluded. The name to exclude and a list of parent elements [V2G2-771]
+#  - Id (attribute in SignedInfo)
+#  - ##any in SignedInfo – CanonicalizationMethod
+#  - HMACOutputLength in SignedInfo – SignatureMethod
+#  - ##other in SignedInfo – SignatureMethod
+#  - Type (attribute in SignedInfo-Reference)
+#  - ##other in SignedInfo – Reference – Transforms – Transform
+#  - XPath in SignedInfo – Reference – Transforms – Transform
+#  - ##other in SignedInfo – Reference – DigestMethod
+#  - Id (attribute in SignatureValue)
+#  - Object (in Signature)
+#  - KeyInfo
+iso2_field_optimizations = {
+    'Id': ['SignedInfo', 'SignatureValue'],  # remove Id from SignedInfo and SignatureValue
+    'ANY': ['CanonicalizationMethod', 'SignatureMethod', 'Transform', 'DigestMethod'],  # remove ##any from these elements
+    'HMACOutputLength': ['SignatureMethod'],  # remove HMACOutputLength from SignatureMethod
+    'Type': ['Reference'],  # remove Type from Reference
+    'XPath': ['Transform'],  # remove XPath from Transform
+    'Object': ['Signature'],  # remove Object from Signature
+    'KeyInfo': []  # remove generally
+}
+
 # if fragment de- and encoder should be generated, set this value to 1.
 # Currently only complex elements can be added to the fragment coders.
 # NOTE! There may be problems when comparing the signature of the eMAID.
@@ -121,6 +143,11 @@
     'DC_ChargeParameterDiscoveryRes',
 ]
 
+# mxldsig fragments which should be generated
+xmldsig_fragments = [
+    'SignedInfo'  # creates only signedInfo fragment
+]
+
 # general C code style
 c_code_indent_chars = 4
 # these characters will be replaced by an underscore in generated code

src/input/code_templates/c/SubStructOptimized.jinja

@@ -0,0 +1,3 @@
+
+{{ indent * level }}// {{ name }} {{ comment }}
+{{ indent * level }}unsigned int {{ name }}_isUsed:1;

src/input/code_templates/c/encoder/EncodeEventOptionalElementOptimized.jinja

@@ -0,0 +1,14 @@
+{%- if option == -2 %}
+{{ indent * level }}if (1 == 0)
+{%- elif option == 0 %}
+{{ indent * level }}if ({{ parameter }}_isUsed == 1u)
+{%- elif option > 0 %}
+{{ indent * level }}else if ({{ parameter }}_isUsed == 1u)
+{%- else %}
+{{ indent * level }}else
+{%- endif %}
+{{ indent * level }}{
+{{ indent * (level + 1) }}{{ event_comment }}
+{{ indent * (level + 1) }}error = EXI_ERROR__ENCODER_NOT_IMPLEMENTED;
+{{ indent * (level + 1) }}done = 1;
+{{ indent * level }}}