Update mini table API comment

PiperOrigin-RevId: 463868386

upb/mini_table.h

@@ -45,6 +45,7 @@ UPB_INLINE const upb_MiniTable* upb_MiniTable_GetSubMessageTable(
   return mini_table->subs[field->submsg_index].submsg;
 }
 
+// Validates enum value against range defined by enum mini table.
 UPB_INLINE bool upb_MiniTable_Enum_CheckValue(const upb_MiniTable_Enum* e,
                                               int32_t val) {
   uint32_t uval = (uint32_t)val;

upb/mini_table_accessors.c

@@ -172,21 +172,6 @@ static const char* decode_tag(const char* ptr, uint32_t* val) {
   }
 }
 
-typedef enum {
-  kUpb_FindUnknown_Ok,
-  kUpb_FindUnknown_NotPresent,
-  kUpb_FindUnknown_ParseError,
-} upb_FindUnknown_Status;
-
-typedef struct {
-  upb_FindUnknown_Status status;
-  const char* ptr;
-  size_t len;
-} find_unknown_ret;
-
-static find_unknown_ret UnknownFieldSet_FindField(const upb_Message* msg,
-                                                  int field_number);
-
 upb_GetExtension_Status upb_MiniTable_GetOrPromoteExtension(
     upb_Message* msg, const upb_MiniTable_Extension* ext_table,
     int decode_options, upb_Arena* arena,
@@ -199,7 +184,7 @@ upb_GetExtension_Status upb_MiniTable_GetOrPromoteExtension(
 
   // Check unknown fields, if available promote.
   int field_number = ext_table->field.number;
-  find_unknown_ret result = UnknownFieldSet_FindField(msg, field_number);
+  upb_FindUnknownRet result = upb_MiniTable_FindUnknown(msg, field_number);
   if (result.status != kUpb_FindUnknown_Ok) {
     UPB_ASSERT(result.status != kUpb_GetExtension_ParseError);
     return kUpb_GetExtension_NotPresent;
@@ -258,7 +243,7 @@ upb_GetExtensionAsBytes_Status upb_MiniTable_GetExtensionAsBytes(
     return kUpb_GetExtensionAsBytes_Ok;
   }
   int field_number = ext_table->field.number;
-  find_unknown_ret result = UnknownFieldSet_FindField(msg, field_number);
+  upb_FindUnknownRet result = upb_MiniTable_FindUnknown(msg, field_number);
   if (result.status != kUpb_FindUnknown_Ok) {
     UPB_ASSERT(result.status != kUpb_GetExtension_ParseError);
     return kUpb_GetExtensionAsBytes_NotPresent;
@@ -329,10 +314,10 @@ enum {
   kUpb_MessageSet_MessageTag = (3 << 3) | kUpb_WireType_Delimited,
 };
 
-static find_unknown_ret UnknownFieldSet_FindField(const upb_Message* msg,
-                                                  int field_number) {
+upb_FindUnknownRet upb_MiniTable_FindUnknown(const upb_Message* msg,
+                                             uint32_t field_number) {
   size_t size;
-  find_unknown_ret ret;
+  upb_FindUnknownRet ret;
 
   const char* ptr = upb_Message_GetUnknown(msg, &size);
   if (size == 0) {

upb/mini_table_accessors.h

@@ -262,6 +262,23 @@ upb_GetExtensionAsBytes_Status upb_MiniTable_GetExtensionAsBytes(
     int encode_options, upb_Arena* arena, const char** extension_data,
     size_t* len);
 
+typedef enum {
+  kUpb_FindUnknown_Ok,
+  kUpb_FindUnknown_NotPresent,
+  kUpb_FindUnknown_ParseError,
+} upb_FindUnknown_Status;
+
+typedef struct {
+  upb_FindUnknown_Status status;
+  // Start of unknown field data in message arena.
+  const char* ptr;
+  // Size of unknown field data.
+  size_t len;
+} upb_FindUnknownRet;
+
+upb_FindUnknownRet upb_MiniTable_FindUnknown(const upb_Message* msg,
+                                             uint32_t field_number);
+
 #ifdef __cplusplus
 } /* extern "C" */
 #endif

upb/mini_table_accessors_test.cc

@@ -376,6 +376,38 @@ TEST(GeneratedCode, GetMutableMessage) {
   upb_Arena_Free(arena);
 }
 
+TEST(GeneratedCode, FindUnknown) {
+  upb_Arena* arena = upb_Arena_New();
+  upb_test_ModelWithExtensions* msg = upb_test_ModelWithExtensions_new(arena);
+  upb_test_ModelWithExtensions_set_random_int32(msg, 10);
+  upb_test_ModelWithExtensions_set_random_name(
+      msg, upb_StringView_FromString("Hello"));
+
+  upb_test_ModelExtension1* extension1 = upb_test_ModelExtension1_new(arena);
+  upb_test_ModelExtension1_set_str(extension1,
+                                   upb_StringView_FromString("World"));
+
+  upb_test_ModelExtension1_set_model_ext(msg, extension1, arena);
+
+  size_t serialized_size;
+  char* serialized =
+      upb_test_ModelWithExtensions_serialize(msg, arena, &serialized_size);
+
+  upb_test_EmptyMessageWithExtensions* base_msg =
+      upb_test_EmptyMessageWithExtensions_parse(serialized, serialized_size,
+                                                arena);
+
+  upb_FindUnknownRet result = upb_MiniTable_FindUnknown(
+      base_msg, upb_test_ModelExtension1_model_ext_ext.field.number);
+  EXPECT_EQ(kUpb_FindUnknown_Ok, result.status);
+
+  result = upb_MiniTable_FindUnknown(
+      base_msg, upb_test_ModelExtension2_model_ext_ext.field.number);
+  EXPECT_EQ(kUpb_FindUnknown_NotPresent, result.status);
+
+  upb_Arena_Free(arena);
+}
+
 TEST(GeneratedCode, Extensions) {
   upb_Arena* arena = upb_Arena_New();
   upb_test_ModelWithExtensions* msg = upb_test_ModelWithExtensions_new(arena);