Protobuf: Fixed stub in length-delimited fields serialization. Now related methods write size of object correctly. Added necessary methods for estimating byte-size of objects in run-time in ProtoKot runtime-library.

proto/compiler/google/src/google/protobuf/compiler/kotlin/Makefile

@@ -26,4 +26,9 @@ clean:
 
 generate:
 	./protoc --kotlin_out=./ ./test/addressbook.proto 
-.PHONY: clean all generate
+.PHONY: clean all generate
+
+low: dummy
+
+dummy: CXXFLAGS += -DKOTLIN_GENERATED_CODE_LANGUAGE_LEVEL_LOW
+dummy: all

proto/compiler/google/src/google/protobuf/compiler/kotlin/src/kotlin_class_generator.cc

@@ -48,8 +48,6 @@ void ClassGenerator::generateCode(io::Printer *printer, bool isBuilder) const {
     // write serialization methods only for fair classes, read methods only for Builders)
     printer->Print("\n");
     generateSerializers(printer, /* isRead = */ isBuilder);
-    printer->Print("\n");
-    generateSerializersNoTag(printer, /* isRead = */ isBuilder);
 
     // builder, mergeFrom and only for fair classes
     if (!isBuilder) {
@@ -69,6 +67,9 @@ void ClassGenerator::generateCode(io::Printer *printer, bool isBuilder) const {
         generateParseMethods(printer);
     }
 
+    // getSize()
+    generateGetSizeMethod(printer);
+
     printer->Outdent();
     printer->Print("}\n");
 }
@@ -172,32 +173,10 @@ void ClassGenerator::generateMergeMethods(io::Printer *printer) const {
     printer->Print("}\n");
 }
 
-void ClassGenerator::generateSerializers(io::Printer * printer, bool isRead) const {
+
-    // readFrom(input: CodedInputStream) OR
+void ClassGenerator::generateSerializers(io::Printer *printer, bool isRead) const {
-    // writeTo(output: CodedOutputStream)
     map <string, string> vars;
-    vars["funName"]= isRead ? "readFrom"            : "writeTo";
+    vars["funName"]= isRead ? "readFrom"       : "writeTo";
-    vars["returnType"] = isRead ? builderName : "Unit";
-    vars["stream"] = isRead ? "CodedInputStream"    : "CodedOutputStream";
-    vars["arg"]    = isRead ? "input"               : "output";
-    vars["maybeSeparator"] = isRead ? "" : ", ";
-    vars["maybeReturn"] = isRead ? "return " : "";
-
-    // generate function header
-    printer->Print(vars,
-                   "fun $funName$ ($arg$: $stream$): $returnType$ {"
-                           "\n");
-    printer->Indent();
-
-    printer->Print(vars, "$maybeReturn$$funName$NoTag($arg$)\n");
-
-    printer->Outdent();
-    printer->Print("}\n");
-}
-
-void ClassGenerator::generateSerializersNoTag(io::Printer *printer, bool isRead) const {
-    map <string, string> vars;
-    vars["funName"]= isRead ? "readFromNoTag"       : "writeToNoTag";
     vars["stream"] = isRead ? "CodedInputStream"    : "CodedOutputStream";
     vars["arg"]    = isRead ? "input"               : "output";
     vars["returnType"] = isRead ? builderName : "Unit";
@@ -341,6 +320,30 @@ void ClassGenerator::generateParseMethods(io::Printer *printer) const {
     printer->Print("}\n");
 }
 
+void ClassGenerator::generateGetSizeMethod(io::Printer *printer) const {
+    printer->Print("fun getSize(): Int {\n");
+    printer->Indent();
+
+    printer->Print("var size = 0\n");
+    for (int i = 0; i < properties.size(); ++i) {
+        properties[i]->generateSizeEstimationCode(printer, "size");
+    }
+
+    printer->Print("return size\n");
+    printer->Outdent();
+    printer->Print("}\n");
+}
+
+
+
+//int ClassGenerator::getSizeWithoutHeader() {
+//    int size = 0;
+//    for (int i = 0; i < properties.size(); ++i) {
+//        size += properties[i].getSizeWithHeader();
+//    }
+//    return 0;
+//}
+
 
 const string ClassModifier::getName() const {
     string result = "";

proto/compiler/google/src/google/protobuf/compiler/kotlin/src/kotlin_class_generator.h

@@ -62,10 +62,10 @@ private:
      * both methods are structurally the same with some trivial substitutions
      * (read -> write and etc.)
      */
-    void generateSerializersNoTag(io::Printer *printer, bool isRead = false) const;
     void generateSerializers(io::Printer * printer, bool isRead = false) const;
     void generateMergeMethods(io::Printer *printer) const;
     void generateParseMethods(io::Printer * printer) const;
+    void generateGetSizeMethod(io::Printer * printer) const;
 };
 
 } // namespace kotlin

proto/compiler/google/src/google/protobuf/compiler/kotlin/src/kotlin_field_generator.cc

@@ -16,12 +16,10 @@ namespace kotlin {
 
 string FieldGenerator::getInitValue() const {
     if (descriptor->is_repeated())
-    #ifndef KOTLIN_GENERATED_CODE_LANGUAGE_LEVEL_LOW
         return "mutableListOf()";
-    #else
+    else if (protoType == FieldDescriptor::TYPE_MESSAGE) {
-        return "arrayOf()";
+        return enclosingClass->builderName + "().build()";
-    #endif
+    }
-
     return name_resolving::protobufTypeToInitValue(descriptor);
 }
 
@@ -82,8 +80,9 @@ void FieldGenerator::generateSerializationCode(io::Printer *printer, bool isRead
             if (!noTag) {
                 printer->Print(vars, "val tag = input.readTag($fieldNumber$, WireType.LENGTH_DELIMITED)\n");
             }
-            printer->Print(vars, "val listSize = input.readInt32NoTag()\n");
+            printer->Print(vars, "val expectedSize = input.readInt32NoTag()\n");
-            printer->Print(vars, "for (i in 1..listSize) {\n");
+            printer->Print("var readSize = 0\n");
+            printer->Print(vars, "while(readSize != expectedSize) {\n");
             printer->Indent();
 
             /* hack: copy current FieldGenerator and change label to OPTIONAL. Also change name to
@@ -99,17 +98,25 @@ void FieldGenerator::generateSerializationCode(io::Printer *printer, bool isRead
 
             /* Another dirty hack here: create tmp variable of a given type and read it from input stream
                then add that tmp var into list.
-               This is made because simple recursive call will generate code, that tries to array[i].mergeFrom()
+               This is made because simple recursive call will generate code that tries to array[i].mergeFrom().
-               but this is incorrect, because array has old size, while 'i' iterates over new size, and of course
+               This is incorrect because array has old size, while 'i' iterates over new size, which can lead
-               they are not necessary the same.
+               to ArrayOutOfIndex errors.
             */
             // TODO: stub here, resolve name properly!
             vars["fieldType"] = underlyingType + ".Builder" + underlyingType;
-            vars["initValue"] = getUnderlyingTypeInitValue();
+            vars["initValue"] = underlyingType + ".Builder" + underlyingType + "()";
-            printer->Print(vars, "val tmp: $fieldType$ = $fieldType$()\n");
+            printer->Print(vars, "val tmp: $fieldType$ = $initValue$\n");
             singleFieldGen.simpleName = "tmp";
             singleFieldGen.modifier = FieldDescriptor::LABEL_OPTIONAL;
-            singleFieldGen.generateSerializationCode(printer, isRead, /* noTag = */ true);
+
+            // Note that primitive types are packed by default in proto3, i.e. they are should be written without tag
+            bool isPrimitive = descriptor->type() != FieldDescriptor::TYPE_BYTES &&
+                    descriptor->type() != FieldDescriptor::TYPE_MESSAGE &&
+                    descriptor->type() != FieldDescriptor::TYPE_STRING &&
+                    descriptor->type() != FieldDescriptor::TYPE_ENUM;
+
+            singleFieldGen.generateSerializationCode(printer, isRead, /* noTag = */ isPrimitive);
+            singleFieldGen.generateSizeEstimationCode(printer, "readSize"); // add size of current element to total size
 
             printer->Print(vars, "$fieldName$.add(tmp.build())\n");
 
@@ -124,7 +131,9 @@ void FieldGenerator::generateSerializationCode(io::Printer *printer, bool isRead
             printer->Print(vars, "output.writeTag($fieldNumber$, WireType.LENGTH_DELIMITED)\n");
 
             // length
-            printer->Print(vars, "output.writeInt32NoTag($fieldName$.size)\n");
+            printer->Print(vars, "var arrayByteSize = 0\n");
+            generateSizeEstimationCode(printer, "arrayByteSize", /* noTag = */ true);
+            printer->Print(vars, "output.writeInt32NoTag(arrayByteSize)\n");
 
             // all elements
             printer->Print(vars, "for (item in $fieldName$) {\n");
@@ -134,7 +143,15 @@ void FieldGenerator::generateSerializationCode(io::Printer *printer, bool isRead
             FieldGenerator singleFieldGen = FieldGenerator(descriptor, enclosingClass);
             singleFieldGen.simpleName = "item";
             singleFieldGen.modifier = FieldDescriptor::LABEL_OPTIONAL;
-            singleFieldGen.generateSerializationCode(printer, isRead, /* noTag = */ true);
+
+            // TODO: maybe refactor this in name_resolving or separate method at least
+            // Note that primitive types are packed by default in proto3, i.e. they are should be written without tag
+            bool isPrimitive = descriptor->type() != FieldDescriptor::TYPE_BYTES &&
+                               descriptor->type() != FieldDescriptor::TYPE_MESSAGE &&
+                               descriptor->type() != FieldDescriptor::TYPE_STRING &&
+                               descriptor->type() != FieldDescriptor::TYPE_ENUM;
+
+            singleFieldGen.generateSerializationCode(printer, isRead, /* noTag = */ isPrimitive);
 
             printer->Outdent(); // for-loop
             printer->Print("}\n");
@@ -166,17 +183,42 @@ void FieldGenerator::generateSerializationCode(io::Printer *printer, bool isRead
 
     /*
       Then check for nested messages. Then we re-use writeTo method, that should be defined in
-      that message
+      that message.
+      Note that readFrom/writeTo methods write message as it's top-level message, i.e. without
+      any tags. Therefore, we have to prepend tags and size manually.
      */
     if (descriptor->type() == FieldDescriptor::TYPE_MESSAGE) {
-        vars["maybeNoTag"] = "NoTag";
         if (isRead) {
+            vars["fieldNumber"] = std::to_string(fieldNumber);
+            vars["dollar"] = "$";
+
+            // read tag
+            printer->Print(vars, "input.readTag($fieldNumber$, WireType.LENGTH_DELIMITED)\n");
+
+            // read expected size
+            printer->Print(vars, "val expectedSize = input.readInt32NoTag()\n");
+
+            // read message itself without tag
             printer->Print(vars,
-                           "$fieldName$.readFrom$maybeNoTag$(input)\n");
+                           "$fieldName$.readFrom(input)\n");
+
+            // check that actual size equal to expected size
+            printer->Print(vars, "if (expectedSize != $fieldName$.getSize()) { "
+                                 "throw InvalidProtocolBufferException ("
+                                     "\"Expected size $dollar${expectedSize} got $dollar${$fieldName$.getSize()}"
+                                 "\") }\n");
         }
         else {
+            vars["fieldNumber"] = std::to_string(fieldNumber);
+            // write tag
+            printer->Print(vars, "output.writeTag($fieldNumber$, WireType.LENGTH_DELIMITED)\n");
+
+            // write message length via runtime-call
+            printer->Print(vars, "output.writeInt32NoTag($fieldName$.getSize())\n");
+
+            // write message itself without tag
             printer->Print(vars,
-                           "$fieldName$.writeTo$maybeNoTag$(output)\n");
+                           "$fieldName$.writeTo(output)\n");
         }
         return;
     }
@@ -224,7 +266,6 @@ void FieldGenerator::generateRepeatedMethods(io::Printer * printer, bool isBuild
         printer->Print("}\n");
     }
 
-    #ifndef KOTLIN_GENERATED_CODE_LANGUAGE_LEVEL_LOW
     if (isBuilder) {
         // generate single-add for builders
         printer->Print(vars, "fun add$elementType$($arg$: $elementType$): $builderName$ {\n");
@@ -249,7 +290,6 @@ void FieldGenerator::generateRepeatedMethods(io::Printer * printer, bool isBuild
         printer->Outdent();     // function body
         printer->Print("}\n");
     }
-    #endif
 }
 
 string FieldGenerator::getKotlinFunctionSuffix() const {
@@ -257,9 +297,85 @@ string FieldGenerator::getKotlinFunctionSuffix() const {
 }
 
 string FieldGenerator::getUnderlyingTypeInitValue() const {
+    if (protoType == FieldDescriptor::TYPE_MESSAGE) {
+        return "Builder" + underlyingType + "().build()";
+    }
     return name_resolving::protobufTypeToInitValue(descriptor);
 }
 
+void FieldGenerator::generateSizeEstimationCode(io::Printer *printer, string varName, bool noTag) const {
+    map<string, string> vars;
+    vars["varName"] = varName;
+    vars["fieldName"] = simpleName;
+    vars["fieldNumber"] = std::to_string(fieldNumber);
+
+    // First of all, generate code for repeated fields
+    if (modifier == FieldDescriptor::LABEL_REPEATED) {
+        // We will need total byte size of array, because that size is itself a part of the message and
+        // adds to total message size.
+        // For the sake of hygiene, temporary variables are created in anonymous scope
+        printer->Print("run {\n");
+        printer->Indent();
+
+        // Create a temporary variable that will collect array byte size
+        printer->Print("var arraySize = 0\n");
+
+        // iterate over all elements of array
+        printer->Print(vars, "for (item in $fieldName$) {\n");
+        printer->Indent();
+
+        // hack: reuse generateSizeEstimationCode in the same manner as in generateSerializationCode
+        FieldGenerator singleFieldGen = FieldGenerator(descriptor, enclosingClass);
+        singleFieldGen.modifier = FieldDescriptor::LABEL_OPTIONAL;
+        singleFieldGen.simpleName = "item";
+        singleFieldGen.generateSizeEstimationCode(printer, "arraySize");
+
+        printer->Outdent();     // for-loop
+        printer->Print("}\n");
+
+        // now add to total message size size of array, consisting of:
+        printer->Print(vars,
+                       "$varName$ += arraySize"); // actual array size
+        if (!noTag) {
+            printer->Print(vars,
+                       " + "
+                       "WireFormat.getTagSize($fieldNumber$, WireType.LENGTH_DELIMITED)" // tag size
+                       " + "
+                       "WireFormat.getVarint32Size(arraySize)"); // runtime call, that will get size of varint, denoting size of array
+        }
+        printer->Print("\n");
+        printer->Outdent();     // anonymous scope
+        printer->Print("}\n");
+
+        return;
+    }
+
+    // Then, call getSize recursively for nested messages
+    // TODO: currently suboptimal repeatative calls getSize() are being made. We can optimize it later via caching calls to getSize()
+    if (protoType == FieldDescriptor::TYPE_MESSAGE) {
+        // don't forget about tag and length annotation
+        printer->Print(vars, "$varName$ += $fieldName$.getSize()"
+                             " + "
+                             "WireFormat.getTagSize($fieldNumber$, WireType.LENGTH_DELIMITED)"
+                             " + "
+                             "WireFormat.getVarint32Size($fieldName$.getSize())\n"
+        );
+        return;
+    }
+
+    // Next, process enums as they should be casted to ints manually
+    if (protoType == FieldDescriptor::TYPE_ENUM) {
+        vars["enumName"] = fullType;
+        printer->Print(vars, "$varName$ += WireFormat.getEnumSize($fieldNumber$, $fieldName$.ord)\n");
+        return;
+    }
+
+    // Finally, get size of all primitive types trivially via call to WireFormat in runtime
+    vars["kotlinSuffix"] = name_resolving::protobufTypeToKotlinFunctionSuffix(descriptor->type());
+    printer->Print(vars, "$varName$ += WireFormat.get$kotlinSuffix$Size($fieldNumber$, $fieldName$)\n");
+    return;
+}
+
 } // namespace kotlin
 } // namespace compiler
 } // namespace protobuf

proto/compiler/google/src/google/protobuf/compiler/kotlin/src/kotlin_field_generator.h

@@ -45,6 +45,7 @@ public:
 
     void generateCode(io::Printer * printer, bool isBuilder) const;
     void generateSerializationCode(io::Printer * printer, bool isRead = false, bool noTag = false) const;
+    void generateSizeEstimationCode(io::Printer * printer, string varName, bool noTag = false) const;
     FieldGenerator(FieldDescriptor const * descriptor, ClassGenerator const * enclosingClass);
     string getKotlinFunctionSuffix() const;
 

proto/compiler/google/src/google/protobuf/compiler/kotlin/src/kotlin_name_resolver.cc

@@ -83,19 +83,14 @@ string protobufToKotlinField(FieldDescriptor const * descriptor) {
         case FieldDescriptor::LABEL_OPTIONAL:
             break;
         case FieldDescriptor::LABEL_REPEATED:
-#ifndef KOTLIN_GENERATED_CODE_LANGUAGE_LEVEL_LOW
             preamble = "MutableList <";
             postamble = "> ";
             break;
-#else
-        preamble  = "Array <";
-            postamble = "> ";
-            break;
-#endif
     }
     return preamble + protobufToKotlinType(descriptor) + postamble;
 }
 
+// TODO: think about nested arrays
 string protobufTypeToInitValue(FieldDescriptor const * descriptor) {
     FieldDescriptor::Type type = descriptor->type();
     switch(type) {

proto/compiler/google/src/google/protobuf/compiler/kotlin/src/main.cc

@@ -10,7 +10,6 @@
 #include "kotlin_file_generator.h"
 #include <iostream>
 
-//#define KOTLIN_GENERATED_CODE_LANGUAGE_LEVEL_LOW
 int main(int argc, const char* const * argv) {
   google::protobuf::compiler::CommandLineInterface cli;
 

proto/compiler/google/src/google/protobuf/compiler/kotlin/test/addressbook.kt

@@ -52,10 +52,6 @@ class Person private constructor (name: kotlin.String = "", id: Int = 0, email:
     }
 
     fun writeTo (output: CodedOutputStream): Unit {
-      writeToNoTag(output)
-    }
-
-    fun writeToNoTag (output: CodedOutputStream): Unit {
       output.writeString (1, number)
       output.writeEnum (2, type.ord)
     }
@@ -82,10 +78,6 @@ class Person private constructor (name: kotlin.String = "", id: Int = 0, email:
       }
 
       fun readFrom (input: CodedInputStream): BuilderPhoneNumber {
-        return readFromNoTag(input)
-      }
-
-      fun readFromNoTag (input: CodedInputStream): BuilderPhoneNumber {
         number = input.readString(1)
         type = PhoneType.fromIntToPhoneType(input.readEnum(2))
         return this
@@ -110,6 +102,12 @@ class Person private constructor (name: kotlin.String = "", id: Int = 0, email:
         while(parseFieldFrom(input)) {}
         return this
       }
+      fun getSize(): Int {
+        var size = 0
+        size += WireFormat.getStringSize(1, number)
+        size += WireFormat.getEnumSize(2, type.ord)
+        return size
+      }
     }
 
 
@@ -121,22 +119,34 @@ class Person private constructor (name: kotlin.String = "", id: Int = 0, email:
     fun mergeFrom (input: CodedInputStream) {
       val builder = BuilderPhoneNumber()
       mergeWith(builder.parseFrom(input).build())}
+    fun getSize(): Int {
+      var size = 0
+      size += WireFormat.getStringSize(1, number)
+      size += WireFormat.getEnumSize(2, type.ord)
+      return size
+    }
   }
 
 
   fun writeTo (output: CodedOutputStream): Unit {
-    writeToNoTag(output)
-  }
-
-  fun writeToNoTag (output: CodedOutputStream): Unit {
     output.writeString (1, name)
     output.writeInt32 (2, id)
     output.writeString (3, email)
     if (phones.size > 0) {
       output.writeTag(4, WireType.LENGTH_DELIMITED)
-      output.writeInt32NoTag(phones.size)
+      var arrayByteSize = 0
+      run {
+        var arraySize = 0
+        for (item in phones) {
+          arraySize += item.getSize() + WireFormat.getTagSize(4, WireType.LENGTH_DELIMITED) + WireFormat.getVarint32Size(item.getSize())
+        }
+        arrayByteSize += arraySize
+      }
+      output.writeInt32NoTag(arrayByteSize)
       for (item in phones) {
-        item.writeToNoTag(output)
+        output.writeTag(4, WireType.LENGTH_DELIMITED)
+        output.writeInt32NoTag(item.getSize())
+        item.writeTo(output)
       }
     }
     output.writeBytes (5, someBytes)
@@ -202,18 +212,19 @@ class Person private constructor (name: kotlin.String = "", id: Int = 0, email:
     }
 
     fun readFrom (input: CodedInputStream): BuilderPerson {
-      return readFromNoTag(input)
-    }
-
-    fun readFromNoTag (input: CodedInputStream): BuilderPerson {
       name = input.readString(1)
       id = input.readInt32(2)
       email = input.readString(3)
       val tag = input.readTag(4, WireType.LENGTH_DELIMITED)
-      val listSize = input.readInt32NoTag()
+      val expectedSize = input.readInt32NoTag()
-      for (i in 1..listSize) {
+      var readSize = 0
+      while(readSize != expectedSize) {
         val tmp: PhoneNumber.BuilderPhoneNumber = PhoneNumber.BuilderPhoneNumber()
-        tmp.readFromNoTag(input)
+        input.readTag(4, WireType.LENGTH_DELIMITED)
+        val expectedSize = input.readInt32NoTag()
+        tmp.readFrom(input)
+        if (expectedSize != tmp.getSize()) { throw InvalidProtocolBufferException ("Expected size ${expectedSize} got ${tmp.getSize()}") }
+        readSize += tmp.getSize() + WireFormat.getTagSize(4, WireType.LENGTH_DELIMITED) + WireFormat.getVarint32Size(tmp.getSize())
         phones.add(tmp.build())
       }
       someBytes = input.readBytes(5)
@@ -235,10 +246,15 @@ class Person private constructor (name: kotlin.String = "", id: Int = 0, email:
         2 -> id = input.readInt32NoTag()
         3 -> email = input.readStringNoTag()
         4 -> {
-          val listSize = input.readInt32NoTag()
+          val expectedSize = input.readInt32NoTag()
-          for (i in 1..listSize) {
+          var readSize = 0
+          while(readSize != expectedSize) {
             val tmp: PhoneNumber.BuilderPhoneNumber = PhoneNumber.BuilderPhoneNumber()
-            tmp.readFromNoTag(input)
+            input.readTag(4, WireType.LENGTH_DELIMITED)
+            val expectedSize = input.readInt32NoTag()
+            tmp.readFrom(input)
+            if (expectedSize != tmp.getSize()) { throw InvalidProtocolBufferException ("Expected size ${expectedSize} got ${tmp.getSize()}") }
+            readSize += tmp.getSize() + WireFormat.getTagSize(4, WireType.LENGTH_DELIMITED) + WireFormat.getVarint32Size(tmp.getSize())
             phones.add(tmp.build())
           }
         }
@@ -249,6 +265,21 @@ class Person private constructor (name: kotlin.String = "", id: Int = 0, email:
       while(parseFieldFrom(input)) {}
       return this
     }
+    fun getSize(): Int {
+      var size = 0
+      size += WireFormat.getStringSize(1, name)
+      size += WireFormat.getInt32Size(2, id)
+      size += WireFormat.getStringSize(3, email)
+      run {
+        var arraySize = 0
+        for (item in phones) {
+          arraySize += item.getSize() + WireFormat.getTagSize(4, WireType.LENGTH_DELIMITED) + WireFormat.getVarint32Size(item.getSize())
+        }
+        size += arraySize + WireFormat.getTagSize(4, WireType.LENGTH_DELIMITED) + WireFormat.getVarint32Size(arraySize)
+      }
+      size += WireFormat.getBytesSize(5, someBytes)
+      return size
+    }
   }
 
 
@@ -263,6 +294,21 @@ class Person private constructor (name: kotlin.String = "", id: Int = 0, email:
   fun mergeFrom (input: CodedInputStream) {
     val builder = BuilderPerson()
     mergeWith(builder.parseFrom(input).build())}
+  fun getSize(): Int {
+    var size = 0
+    size += WireFormat.getStringSize(1, name)
+    size += WireFormat.getInt32Size(2, id)
+    size += WireFormat.getStringSize(3, email)
+    run {
+      var arraySize = 0
+      for (item in phones) {
+        arraySize += item.getSize() + WireFormat.getTagSize(4, WireType.LENGTH_DELIMITED) + WireFormat.getVarint32Size(item.getSize())
+      }
+      size += arraySize + WireFormat.getTagSize(4, WireType.LENGTH_DELIMITED) + WireFormat.getVarint32Size(arraySize)
+    }
+    size += WireFormat.getBytesSize(5, someBytes)
+    return size
+  }
 }
 
 
@@ -276,15 +322,21 @@ class AddressBook private constructor (people: MutableList <Person>  = mutableLi
   }
 
   fun writeTo (output: CodedOutputStream): Unit {
-    writeToNoTag(output)
-  }
-
-  fun writeToNoTag (output: CodedOutputStream): Unit {
     if (people.size > 0) {
       output.writeTag(1, WireType.LENGTH_DELIMITED)
-      output.writeInt32NoTag(people.size)
+      var arrayByteSize = 0
+      run {
+        var arraySize = 0
+        for (item in people) {
+          arraySize += item.getSize() + WireFormat.getTagSize(1, WireType.LENGTH_DELIMITED) + WireFormat.getVarint32Size(item.getSize())
+        }
+        arrayByteSize += arraySize
+      }
+      output.writeInt32NoTag(arrayByteSize)
       for (item in people) {
-        item.writeToNoTag(output)
+        output.writeTag(1, WireType.LENGTH_DELIMITED)
+        output.writeInt32NoTag(item.getSize())
+        item.writeTo(output)
       }
     }
   }
@@ -317,15 +369,16 @@ class AddressBook private constructor (people: MutableList <Person>  = mutableLi
     }
 
     fun readFrom (input: CodedInputStream): BuilderAddressBook {
-      return readFromNoTag(input)
-    }
-
-    fun readFromNoTag (input: CodedInputStream): BuilderAddressBook {
       val tag = input.readTag(1, WireType.LENGTH_DELIMITED)
-      val listSize = input.readInt32NoTag()
+      val expectedSize = input.readInt32NoTag()
-      for (i in 1..listSize) {
+      var readSize = 0
+      while(readSize != expectedSize) {
         val tmp: Person.BuilderPerson = Person.BuilderPerson()
-        tmp.readFromNoTag(input)
+        input.readTag(1, WireType.LENGTH_DELIMITED)
+        val expectedSize = input.readInt32NoTag()
+        tmp.readFrom(input)
+        if (expectedSize != tmp.getSize()) { throw InvalidProtocolBufferException ("Expected size ${expectedSize} got ${tmp.getSize()}") }
+        readSize += tmp.getSize() + WireFormat.getTagSize(1, WireType.LENGTH_DELIMITED) + WireFormat.getVarint32Size(tmp.getSize())
         people.add(tmp.build())
       }
       return this
@@ -343,10 +396,15 @@ class AddressBook private constructor (people: MutableList <Person>  = mutableLi
       val wireType = WireFormat.getTagWireType(tag)
       when(fieldNumber) {
         1 -> {
-          val listSize = input.readInt32NoTag()
+          val expectedSize = input.readInt32NoTag()
-          for (i in 1..listSize) {
+          var readSize = 0
+          while(readSize != expectedSize) {
             val tmp: Person.BuilderPerson = Person.BuilderPerson()
-            tmp.readFromNoTag(input)
+            input.readTag(1, WireType.LENGTH_DELIMITED)
+            val expectedSize = input.readInt32NoTag()
+            tmp.readFrom(input)
+            if (expectedSize != tmp.getSize()) { throw InvalidProtocolBufferException ("Expected size ${expectedSize} got ${tmp.getSize()}") }
+            readSize += tmp.getSize() + WireFormat.getTagSize(1, WireType.LENGTH_DELIMITED) + WireFormat.getVarint32Size(tmp.getSize())
             people.add(tmp.build())
           }
         }
@@ -356,6 +414,17 @@ class AddressBook private constructor (people: MutableList <Person>  = mutableLi
       while(parseFieldFrom(input)) {}
       return this
     }
+    fun getSize(): Int {
+      var size = 0
+      run {
+        var arraySize = 0
+        for (item in people) {
+          arraySize += item.getSize() + WireFormat.getTagSize(1, WireType.LENGTH_DELIMITED) + WireFormat.getVarint32Size(item.getSize())
+        }
+        size += arraySize + WireFormat.getTagSize(1, WireType.LENGTH_DELIMITED) + WireFormat.getVarint32Size(arraySize)
+      }
+      return size
+    }
   }
 
 
@@ -366,6 +435,17 @@ class AddressBook private constructor (people: MutableList <Person>  = mutableLi
   fun mergeFrom (input: CodedInputStream) {
     val builder = BuilderAddressBook()
     mergeWith(builder.parseFrom(input).build())}
+  fun getSize(): Int {
+    var size = 0
+    run {
+      var arraySize = 0
+      for (item in people) {
+        arraySize += item.getSize() + WireFormat.getTagSize(1, WireType.LENGTH_DELIMITED) + WireFormat.getVarint32Size(item.getSize())
+      }
+      size += arraySize + WireFormat.getTagSize(1, WireType.LENGTH_DELIMITED) + WireFormat.getVarint32Size(arraySize)
+    }
+    return size
+  }
 }
 
 

proto/compiler/src/CodedInputStream.kt

@@ -1,5 +1,8 @@
 import java.nio.ByteBuffer
 import java.nio.ByteOrder
+import WireFormat.VARINT_INFO_BITS_COUNT
+import WireFormat.VARINT_INFO_BITS_MASK
+import WireFormat.VARINT_UTIL_BIT_MASK
 
 /**
  * Created by Dmitry Savvinov on 7/6/16.
@@ -13,7 +16,6 @@ import java.nio.ByteOrder
 
 // TODO: refactor correctness checks into readTag
 class CodedInputStream(input: java.io.InputStream) {
-
     val bufferedInput: java.io.BufferedInputStream
     init {
         bufferedInput = java.io.BufferedInputStream(input)  // TODO: Java's realization uses hand-written buffers. Why?
@@ -299,11 +301,5 @@ class CodedInputStream(input: java.io.InputStream) {
         bufferedInput.reset()
         return byte == -1
     }
-
-    // couple of constants for magic numbers
-    val VARINT_INFO_BITS_COUNT: Int = 7
-    val VARINT_INFO_BITS_MASK: Int = 0b01111111    // mask for separating lowest 7 bits, where actual information stored
-    val VARINT_UTIL_BIT_MASK: Int = 0b10000000     // mask for separating highest bit, that indicates next byte presence
-
 }
 

proto/compiler/src/CodedOutputStream.kt

@@ -1,5 +1,8 @@
 import java.nio.ByteBuffer
 import java.nio.ByteOrder
+import WireFormat.VARINT_INFO_BITS_COUNT
+import WireFormat.VARINT_INFO_BITS_MASK
+import WireFormat.VARINT_UTIL_BIT_MASK
 
 /**
  * Created by user on 7/6/16.
@@ -75,7 +78,7 @@ class CodedOutputStream(val output: java.io.OutputStream) {
     }
 
     fun writeSInt64NoTag(value: Long) {
-        writeInt64NoTag((value shl 1) xor (value shr 31))
+        writeInt64NoTag((value shl 1) xor (value shr 63))
     }
 
     fun writeFixed32(fieldNumber: Int, value: Int?) {
@@ -148,7 +151,7 @@ class CodedOutputStream(val output: java.io.OutputStream) {
 
     fun writeStringNoTag(value: String) {
         writeInt32NoTag(value.length)
-        output.write(value.toByteArray())
+        output.write(value.toByteArray(Charsets.UTF_8))
     }
 
     fun writeBytes(fieldNumber: Int, value: ByteArray?) {
@@ -209,7 +212,7 @@ class CodedOutputStream(val output: java.io.OutputStream) {
         var resSize = 0
         do {
             // encode current 7 bits
-            var curByte = (curValue and VARINT_INFO_BITS_MASK)
+            var curByte = (curValue and WireFormat.VARINT_INFO_BITS_MASK)
 
             // discard encoded bits. Note that unsigned shift is needed for cases with negative numbers
             curValue = curValue ushr VARINT_INFO_BITS_COUNT
@@ -251,8 +254,5 @@ class CodedOutputStream(val output: java.io.OutputStream) {
         output.write(res, 0, resSize)
     }
 
-    // couple of constants for magic numbers
+
-    val VARINT_INFO_BITS_COUNT: Int = 7
-    val VARINT_INFO_BITS_MASK: Int = 0b01111111    // mask for separating lowest 7 bits, where actual information stored
-    val VARINT_UTIL_BIT_MASK: Int = 0b10000000     // mask for separating highest bit, that indicates next byte presence
 }

proto/compiler/src/PersonMessage.kt

@@ -1,17 +1,17 @@
-class Person private constructor (name: kotlin.String? = "", id: Int? = 0, email: kotlin.String? = "", phones: MutableList <PhoneNumber>  = mutableListOf(), someBytes: ByteArray? = ByteArray(0)) {
+class Person private constructor (name: kotlin.String = "", id: Int = 0, email: kotlin.String = "", phones: MutableList <PhoneNumber>  = mutableListOf(), someBytes: ByteArray = ByteArray(0)) {
-    var name : kotlin.String?
+    var name : kotlin.String
         private set
 
-    var id : Int?
+    var id : Int
         private set
 
-    var email : kotlin.String?
+    var email : kotlin.String
         private set
 
     var phones : MutableList <PhoneNumber>
         private set
 
-    var someBytes : ByteArray?
+    var someBytes : ByteArray
         private set
 
 
@@ -38,11 +38,11 @@ class Person private constructor (name: kotlin.String? = "", id: Int? = 0, email
             }
         }
     }
-    class PhoneNumber private constructor (number: kotlin.String? = "", type: PhoneType? = PhoneType.fromIntToPhoneType(0)) {
+    class PhoneNumber private constructor (number: kotlin.String = "", type: PhoneType = PhoneType.fromIntToPhoneType(0)) {
-        var number : kotlin.String?
+        var number : kotlin.String
             private set
 
-        var type : PhoneType?
+        var type : PhoneType
             private set
 
 
@@ -52,25 +52,21 @@ class Person private constructor (name: kotlin.String? = "", id: Int? = 0, email
         }
 
         fun writeTo (output: CodedOutputStream): Unit {
-            writeToNoTag(output)
-        }
-
-        fun writeToNoTag (output: CodedOutputStream): Unit {
             output.writeString (1, number)
-            output.writeEnum (2, type?.ord)
+            output.writeEnum (2, type.ord)
         }
 
-        class BuilderPhoneNumber constructor (number: kotlin.String? = "", type: PhoneType? = PhoneType.fromIntToPhoneType(0)) {
+        class BuilderPhoneNumber constructor (number: kotlin.String = "", type: PhoneType = PhoneType.fromIntToPhoneType(0)) {
-            var number : kotlin.String?
+            var number : kotlin.String
                 private set
-            fun setNumber(value: kotlin.String?): BuilderPhoneNumber {
+            fun setNumber(value: kotlin.String): BuilderPhoneNumber {
                 number = value
                 return this
             }
 
-            var type : PhoneType?
+            var type : PhoneType
                 private set
-            fun setType(value: PhoneType?): BuilderPhoneNumber {
+            fun setType(value: PhoneType): BuilderPhoneNumber {
                 type = value
                 return this
             }
@@ -82,10 +78,6 @@ class Person private constructor (name: kotlin.String? = "", id: Int? = 0, email
             }
 
             fun readFrom (input: CodedInputStream): BuilderPhoneNumber {
-                return readFromNoTag(input)
-            }
-
-            fun readFromNoTag (input: CodedInputStream): BuilderPhoneNumber {
                 number = input.readString(1)
                 type = PhoneType.fromIntToPhoneType(input.readEnum(2))
                 return this
@@ -110,6 +102,12 @@ class Person private constructor (name: kotlin.String? = "", id: Int? = 0, email
                 while(parseFieldFrom(input)) {}
                 return this
             }
+            fun getSize(): Int {
+                var size = 0
+                size += WireFormat.getStringSize(1, number)
+                size += WireFormat.getEnumSize(2, type.ord)
+                return size
+            }
         }
 
 
@@ -121,45 +119,57 @@ class Person private constructor (name: kotlin.String? = "", id: Int? = 0, email
         fun mergeFrom (input: CodedInputStream) {
             val builder = BuilderPhoneNumber()
             mergeWith(builder.parseFrom(input).build())}
+        fun getSize(): Int {
+            var size = 0
+            size += WireFormat.getStringSize(1, number)
+            size += WireFormat.getEnumSize(2, type.ord)
+            return size
+        }
     }
 
 
     fun writeTo (output: CodedOutputStream): Unit {
-        writeToNoTag(output)
-    }
-
-    fun writeToNoTag (output: CodedOutputStream): Unit {
         output.writeString (1, name)
         output.writeInt32 (2, id)
         output.writeString (3, email)
         if (phones.size > 0) {
             output.writeTag(4, WireType.LENGTH_DELIMITED)
-            output.writeInt32NoTag(phones.size)
+            var arrayByteSize = 0
+            run {
+                var arraySize = 0
+                for (item in phones) {
+                    arraySize += item.getSize() + WireFormat.getTagSize(4, WireType.LENGTH_DELIMITED) + WireFormat.getVarint32Size(item.getSize())
+                }
+                arrayByteSize += arraySize
+            }
+            output.writeInt32NoTag(arrayByteSize)
             for (item in phones) {
-                item.writeToNoTag(output)
+                output.writeTag(4, WireType.LENGTH_DELIMITED)
+                output.writeInt32NoTag(item.getSize())
+                item.writeTo(output)
             }
         }
         output.writeBytes (5, someBytes)
     }
 
-    class BuilderPerson constructor (name: kotlin.String? = "", id: Int? = 0, email: kotlin.String? = "", phones: MutableList <PhoneNumber>  = mutableListOf(), someBytes: ByteArray? = ByteArray(0)) {
+    class BuilderPerson constructor (name: kotlin.String = "", id: Int = 0, email: kotlin.String = "", phones: MutableList <PhoneNumber>  = mutableListOf(), someBytes: ByteArray = ByteArray(0)) {
-        var name : kotlin.String?
+        var name : kotlin.String
             private set
-        fun setName(value: kotlin.String?): BuilderPerson {
+        fun setName(value: kotlin.String): BuilderPerson {
             name = value
             return this
         }
 
-        var id : Int?
+        var id : Int
             private set
-        fun setId(value: Int?): BuilderPerson {
+        fun setId(value: Int): BuilderPerson {
             id = value
             return this
         }
 
-        var email : kotlin.String?
+        var email : kotlin.String
             private set
-        fun setEmail(value: kotlin.String?): BuilderPerson {
+        fun setEmail(value: kotlin.String): BuilderPerson {
             email = value
             return this
         }
@@ -185,9 +195,9 @@ class Person private constructor (name: kotlin.String? = "", id: Int? = 0, email
             return this
         }
 
-        var someBytes : ByteArray?
+        var someBytes : ByteArray
             private set
-        fun setSomeBytes(value: ByteArray?): BuilderPerson {
+        fun setSomeBytes(value: ByteArray): BuilderPerson {
             someBytes = value
             return this
         }
@@ -202,18 +212,19 @@ class Person private constructor (name: kotlin.String? = "", id: Int? = 0, email
         }
 
         fun readFrom (input: CodedInputStream): BuilderPerson {
-            return readFromNoTag(input)
-        }
-
-        fun readFromNoTag (input: CodedInputStream): BuilderPerson {
             name = input.readString(1)
             id = input.readInt32(2)
             email = input.readString(3)
             val tag = input.readTag(4, WireType.LENGTH_DELIMITED)
-            val listSize = input.readInt32NoTag()
+            val expectedSize = input.readInt32NoTag()
-            for (i in 1..listSize) {
+            var readSize = 0
+            while(readSize != expectedSize) {
                 val tmp: PhoneNumber.BuilderPhoneNumber = PhoneNumber.BuilderPhoneNumber()
-                tmp.readFromNoTag(input)
+                input.readTag(4, WireType.LENGTH_DELIMITED)
+                val expectedSize = input.readInt32NoTag()
+                tmp.readFrom(input)
+                if (expectedSize != tmp.getSize()) { throw InvalidProtocolBufferException ("Expected size ${expectedSize} got ${tmp.getSize()}") }
+                readSize += tmp.getSize() + WireFormat.getTagSize(4, WireType.LENGTH_DELIMITED) + WireFormat.getVarint32Size(tmp.getSize())
                 phones.add(tmp.build())
             }
             someBytes = input.readBytes(5)
@@ -235,10 +246,15 @@ class Person private constructor (name: kotlin.String? = "", id: Int? = 0, email
                 2 -> id = input.readInt32NoTag()
                 3 -> email = input.readStringNoTag()
                 4 -> {
-                    val listSize = input.readInt32NoTag()
+                    val expectedSize = input.readInt32NoTag()
-                    for (i in 1..listSize) {
+                    var readSize = 0
+                    while(readSize != expectedSize) {
                         val tmp: PhoneNumber.BuilderPhoneNumber = PhoneNumber.BuilderPhoneNumber()
-                        tmp.readFromNoTag(input)
+                        input.readTag(4, WireType.LENGTH_DELIMITED)
+                        val expectedSize = input.readInt32NoTag()
+                        tmp.readFrom(input)
+                        if (expectedSize != tmp.getSize()) { throw InvalidProtocolBufferException ("Expected size ${expectedSize} got ${tmp.getSize()}") }
+                        readSize += tmp.getSize() + WireFormat.getTagSize(4, WireType.LENGTH_DELIMITED) + WireFormat.getVarint32Size(tmp.getSize())
                         phones.add(tmp.build())
                     }
                 }
@@ -249,6 +265,21 @@ class Person private constructor (name: kotlin.String? = "", id: Int? = 0, email
             while(parseFieldFrom(input)) {}
             return this
         }
+        fun getSize(): Int {
+            var size = 0
+            size += WireFormat.getStringSize(1, name)
+            size += WireFormat.getInt32Size(2, id)
+            size += WireFormat.getStringSize(3, email)
+            run {
+                var arraySize = 0
+                for (item in phones) {
+                    arraySize += item.getSize() + WireFormat.getTagSize(4, WireType.LENGTH_DELIMITED) + WireFormat.getVarint32Size(item.getSize())
+                }
+                size += arraySize + WireFormat.getTagSize(4, WireType.LENGTH_DELIMITED) + WireFormat.getVarint32Size(arraySize)
+            }
+            size += WireFormat.getBytesSize(5, someBytes)
+            return size
+        }
     }
 
 
@@ -257,12 +288,27 @@ class Person private constructor (name: kotlin.String? = "", id: Int? = 0, email
         id = other.id
         email = other.email
         phones.addAll(other.phones)
-        someBytes?.plus(other.someBytes ?: ByteArray(0))
+        someBytes.plus(other.someBytes)
     }
 
     fun mergeFrom (input: CodedInputStream) {
         val builder = BuilderPerson()
         mergeWith(builder.parseFrom(input).build())}
+    fun getSize(): Int {
+        var size = 0
+        size += WireFormat.getStringSize(1, name)
+        size += WireFormat.getInt32Size(2, id)
+        size += WireFormat.getStringSize(3, email)
+        run {
+            var arraySize = 0
+            for (item in phones) {
+                arraySize += item.getSize() + WireFormat.getTagSize(4, WireType.LENGTH_DELIMITED) + WireFormat.getVarint32Size(item.getSize())
+            }
+            size += arraySize + WireFormat.getTagSize(4, WireType.LENGTH_DELIMITED) + WireFormat.getVarint32Size(arraySize)
+        }
+        size += WireFormat.getBytesSize(5, someBytes)
+        return size
+    }
 }
 
 
@@ -276,15 +322,21 @@ class AddressBook private constructor (people: MutableList <Person>  = mutableLi
     }
 
     fun writeTo (output: CodedOutputStream): Unit {
-        writeToNoTag(output)
-    }
-
-    fun writeToNoTag (output: CodedOutputStream): Unit {
         if (people.size > 0) {
             output.writeTag(1, WireType.LENGTH_DELIMITED)
-            output.writeInt32NoTag(people.size)
+            var arrayByteSize = 0
+            run {
+                var arraySize = 0
+                for (item in people) {
+                    arraySize += item.getSize() + WireFormat.getTagSize(1, WireType.LENGTH_DELIMITED) + WireFormat.getVarint32Size(item.getSize())
+                }
+                arrayByteSize += arraySize
+            }
+            output.writeInt32NoTag(arrayByteSize)
             for (item in people) {
-                item.writeToNoTag(output)
+                output.writeTag(1, WireType.LENGTH_DELIMITED)
+                output.writeInt32NoTag(item.getSize())
+                item.writeTo(output)
             }
         }
     }
@@ -317,15 +369,16 @@ class AddressBook private constructor (people: MutableList <Person>  = mutableLi
         }
 
         fun readFrom (input: CodedInputStream): BuilderAddressBook {
-            return readFromNoTag(input)
-        }
-
-        fun readFromNoTag (input: CodedInputStream): BuilderAddressBook {
             val tag = input.readTag(1, WireType.LENGTH_DELIMITED)
-            val listSize = input.readInt32NoTag()
+            val expectedSize = input.readInt32NoTag()
-            for (i in 1..listSize) {
+            var readSize = 0
+            while(readSize != expectedSize) {
                 val tmp: Person.BuilderPerson = Person.BuilderPerson()
-                tmp.readFromNoTag(input)
+                input.readTag(1, WireType.LENGTH_DELIMITED)
+                val expectedSize = input.readInt32NoTag()
+                tmp.readFrom(input)
+                if (expectedSize != tmp.getSize()) { throw InvalidProtocolBufferException ("Expected size ${expectedSize} got ${tmp.getSize()}") }
+                readSize += tmp.getSize() + WireFormat.getTagSize(1, WireType.LENGTH_DELIMITED) + WireFormat.getVarint32Size(tmp.getSize())
                 people.add(tmp.build())
             }
             return this
@@ -343,10 +396,15 @@ class AddressBook private constructor (people: MutableList <Person>  = mutableLi
             val wireType = WireFormat.getTagWireType(tag)
             when(fieldNumber) {
                 1 -> {
-                    val listSize = input.readInt32NoTag()
+                    val expectedSize = input.readInt32NoTag()
-                    for (i in 1..listSize) {
+                    var readSize = 0
+                    while(readSize != expectedSize) {
                         val tmp: Person.BuilderPerson = Person.BuilderPerson()
-                        tmp.readFromNoTag(input)
+                        input.readTag(1, WireType.LENGTH_DELIMITED)
+                        val expectedSize = input.readInt32NoTag()
+                        tmp.readFrom(input)
+                        if (expectedSize != tmp.getSize()) { throw InvalidProtocolBufferException ("Expected size ${expectedSize} got ${tmp.getSize()}") }
+                        readSize += tmp.getSize() + WireFormat.getTagSize(1, WireType.LENGTH_DELIMITED) + WireFormat.getVarint32Size(tmp.getSize())
                         people.add(tmp.build())
                     }
                 }
@@ -356,6 +414,17 @@ class AddressBook private constructor (people: MutableList <Person>  = mutableLi
             while(parseFieldFrom(input)) {}
             return this
         }
+        fun getSize(): Int {
+            var size = 0
+            run {
+                var arraySize = 0
+                for (item in people) {
+                    arraySize += item.getSize() + WireFormat.getTagSize(1, WireType.LENGTH_DELIMITED) + WireFormat.getVarint32Size(item.getSize())
+                }
+                size += arraySize + WireFormat.getTagSize(1, WireType.LENGTH_DELIMITED) + WireFormat.getVarint32Size(arraySize)
+            }
+            return size
+        }
     }
 
 
@@ -366,6 +435,17 @@ class AddressBook private constructor (people: MutableList <Person>  = mutableLi
     fun mergeFrom (input: CodedInputStream) {
         val builder = BuilderAddressBook()
         mergeWith(builder.parseFrom(input).build())}
+    fun getSize(): Int {
+        var size = 0
+        run {
+            var arraySize = 0
+            for (item in people) {
+                arraySize += item.getSize() + WireFormat.getTagSize(1, WireType.LENGTH_DELIMITED) + WireFormat.getVarint32Size(item.getSize())
+            }
+            size += arraySize + WireFormat.getTagSize(1, WireType.LENGTH_DELIMITED) + WireFormat.getVarint32Size(arraySize)
+        }
+        return size
+    }
 }
 
 

proto/compiler/src/TestMessages.kt

@@ -29,7 +29,7 @@ fun testMessageSerialization() {
                             .build()
             )
             .build()    // don't forget to call build() to produce message
-    msg.writeToNoTag(outs)
+    msg.writeTo(outs)
 
     // Now let's use output stream as input to read our message from it!
     var ins = CodedInputStream(ByteArrayInputStream(s.toByteArray()))

proto/compiler/src/WireFormat.kt

@@ -4,8 +4,14 @@
 
 
 object WireFormat {
+    // couple of constants for magic numbers
     val TAG_TYPE_BITS: Int = 3
     val TAG_TYPE_MASK: Int = (1 shl TAG_TYPE_BITS) - 1
+    val VARINT_INFO_BITS_COUNT: Int = 7
+    val VARINT_INFO_BITS_MASK: Int = 0b01111111    // mask for separating lowest 7 bits, where actual information stored
+    val VARINT_UTIL_BIT_MASK: Int = 0b10000000     // mask for separating highest bit, that indicates next byte presence
+    val FIXED_32_BYTE_SIZE: Int = 4
+    val FIXED_64_BYTE_SIZE: Int = 8
 
     fun getTagWireType(tag: Int): WireType {
         return WireType from (tag and TAG_TYPE_MASK).toByte()
@@ -14,4 +20,95 @@ object WireFormat {
     fun getTagFieldNumber(tag: Int): Int {
         return tag ushr TAG_TYPE_BITS
     }
+
+    // TODO: refactor casts into function overloading as soon as translator will support it
+    fun getTagSize(fieldNumber: Int, wireType: WireType): Int {
+        return getVarint32Size((fieldNumber shl 3) or wireType.ordinal)
+    }
+
+    fun getVarint32Size(value: Int): Int {
+        var curValue = value
+        var size = 0
+        while (curValue != 0) {
+            size += 1
+            curValue = value ushr VARINT_INFO_BITS_COUNT
+        }
+        return size
+    }
+
+    fun getVarint64Size(value: Long): Int {
+        var curValue = value
+        var size = 0
+        while (curValue != 0L) {
+            size += 1
+            curValue = value ushr VARINT_INFO_BITS_COUNT
+        }
+        return size
+    }
+
+    fun getZigZag32Size(value: Int): Int {
+        return getVarint32Size((value shl 1) xor (value shr 31))
+    }
+
+    fun getZigZag64Size(value: Long): Int {
+        return getVarint64Size((value shl 1) xor (value shr 63))
+    }
+
+    fun getInt32Size(fieldNumber: Int, value: Int): Int {
+        return getTagSize(fieldNumber, WireType.VARINT) + getVarint32Size(value)
+    }
+
+    fun getUInt32Size(fieldNumber: Int, value: Int): Int {
+        return getInt32Size(fieldNumber, value)
+    }
+
+    fun getInt64Size(fieldNumber: Int, value: Long): Int {
+        return getTagSize(fieldNumber, WireType.VARINT) + getVarint64Size(value)
+    }
+
+    fun getUInt64Size(fieldNumber: Int, value: Long): Int {
+        return getInt64Size(fieldNumber, value)
+    }
+
+    fun getBoolSize(fieldNumber: Int, value: Boolean): Int {
+        val intValue = if (value) 1 else 0
+        return getInt32Size(fieldNumber, intValue)
+    }
+
+    fun getEnumSize(fieldNumber: Int, value: Int): Int {
+        return getInt32Size(fieldNumber, value)
+    }
+
+    fun getSInt32Size(fieldNumber: Int, value: Int): Int {
+        return getTagSize(fieldNumber, WireType.VARINT) + getZigZag32Size(value)
+    }
+
+    fun getSInt64Size(fieldNumber: Int, value: Long): Int {
+        return getTagSize(fieldNumber, WireType.VARINT) + getZigZag64Size(value)
+    }
+
+    fun getFixed32Size(fieldNumber: Int, value: Long): Int {
+        return getTagSize(fieldNumber, WireType.FIX_32) + FIXED_32_BYTE_SIZE
+    }
+
+    fun getFixed64Size(fieldNumber: Int, value: Long): Int {
+        return getTagSize(fieldNumber, WireType.FIX_64) + FIXED_64_BYTE_SIZE
+    }
+
+    fun getDoubleSize(fieldNumber: Int, value: Double): Int {
+        return getTagSize(fieldNumber, WireType.FIX_32) + FIXED_32_BYTE_SIZE
+    }
+
+    fun getFloatSize(fieldNumber: Int, value: Float): Int {
+        return getTagSize(fieldNumber, WireType.FIX_64) + FIXED_64_BYTE_SIZE
+    }
+
+    fun getStringSize(fieldNumber: Int, value: String): Int {
+        val encodedStringSize = value.toByteArray(Charsets.UTF_8).size  //TODO: not sure if it's the best way to do it
+        return encodedStringSize + getTagSize(fieldNumber, WireType.LENGTH_DELIMITED) + getVarint32Size(encodedStringSize)
+    }
+
+    fun getBytesSize(fieldNumber: Int, value: ByteArray): Int {
+        return value.size + getTagSize(fieldNumber, WireType.LENGTH_DELIMITED) + getVarint32Size(value.size)
+    }
 }