diff --git a/CMakeLists.txt b/CMakeLists.txt
index 29884c5..9c74384 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 2.8.12)
 project(network_packet_composer)
 
-set(CMAKE_CXX_FLAGS "--std=c++14 -g -Wall")
+set(CMAKE_CXX_FLAGS "-std=c++14 -g -Wall")
 
 # Find includes in corresponding build directories
 set(CMAKE_INCLUDE_CURRENT_DIR ON)
diff --git a/doc/model.md b/doc/model.md
index 85f485e..d959a81 100644
--- a/doc/model.md
+++ b/doc/model.md
@@ -1,8 +1,8 @@
 # NPC core
 
 ```plantuml
-abstract class ARepository
-abstract class ARepositoryFactory
+
+
 class RepositoryFactory
 class Repository {
   +addStructure()
@@ -10,10 +10,10 @@ class Repository {
   +getStructure()
 }
 
-abstract class AStackModelFactory
+
 class StackModelFactory
 
-abstract class AStackModel
+
 class StackModel {
   +getBinary():byte[]
   +getStructures():Structure[]
@@ -21,9 +21,9 @@ class StackModel {
   +removeStructure()
 }
 
-abstract class AStructureFactory
+
 class StructureFactory
-abstract class AStructure
+
 class Structure {
   -name
   -description
@@ -34,15 +34,15 @@ class Structure {
   +updateData()
 }
 
-abstract class AFieldFactory{
+
+class FieldFactory{
 + createField()
 + createFieldBinaryInformation()
 + createFieldLogicalInformation()
 + createFieldVisualInformation()
 + createFieldRepresentation()
 }
-class FieldFactory
-abstract class AField
+
 class Field {
   - owningStructure
   - binary
@@ -81,22 +81,14 @@ class RandomAccessBinary {
 + get_hex_string()
 }
 
-ARepositoryFactory <|-- RepositoryFactory
-ARepository <|-- Repository
 RepositoryFactory --> Repository : creates >
 
-AStackModelFactory <|-- StackModelFactory
-AStackModel <|-- StackModel
 StackModelFactory --> StackModel: creates >
 
-AStructureFactory <|-- StructureFactory
-AStructure <|-- Structure
 StructureFactory --> Structure : creates >
 StackModel *-- Structure
 Repository *-- Structure
 
-AFieldFactory <|-- FieldFactory
-AField <|-- Field
 FieldFactory --> Field : creates >
 
 Structure *-- Field
diff --git a/src/core/RandomAccessBinary.cpp b/src/core/RandomAccessBinary.cpp
index 352ec25..8a588e5 100644
--- a/src/core/RandomAccessBinary.cpp
+++ b/src/core/RandomAccessBinary.cpp
@@ -1,17 +1,18 @@
 #include "RandomAccessBinary.h"
 #include <memory>
 #include <vector>
+#include <iomanip>
+#include <iostream>
+#include <algorithm>
 
-RandomAccessBinary::RandomAccessBinary()
-{
-    this->ptr_data = std::make_unique<std::vector<uint8_t>>();
-    this->ptr_data->reserve(1548);
-}
+RandomAccessBinary::RandomAccessBinary() : RandomAccessBinary(1548)
+{}
 
 RandomAccessBinary::RandomAccessBinary(uint possible_packetsize)
 {
     this->ptr_data = std::make_unique<std::vector<uint8_t>>();
     this->ptr_data->reserve(possible_packetsize);
+    this->endianness = RandomAccessBinary::Endianness::BIG;
 }
 
 RandomAccessBinary::~RandomAccessBinary()
@@ -19,7 +20,7 @@ RandomAccessBinary::~RandomAccessBinary()
 
 }
 
-const RandomAccessBinary::Endianness RandomAccessBinary::getEndianness()
+RandomAccessBinary::Endianness RandomAccessBinary::getEndianness()
 {
     return this->endianness;
 }
@@ -31,32 +32,34 @@ void RandomAccessBinary::setEndianness(RandomAccessBinary::Endianness endianness
 
 void RandomAccessBinary::setBytes(uint position, const std::vector<uint8_t> &data)
 {
+    auto it = this->ptr_data->begin();
     for(uint i = 0; i < data.size(); ++i)
-        (*this->ptr_data)[position+i] = data[i];
+        this->ptr_data->insert(it+(position+i), data[i]);
 }
 
 void RandomAccessBinary::setByte(uint position, const uint8_t &data)
 {
-    (*this->ptr_data)[position] = data;
+    auto it = this->ptr_data->begin();
+    this->ptr_data->insert(it+position, data);
 }
 
 void RandomAccessBinary::setBit(uint64_t position, const bool &value)
 {
-    uint64_t bytePosition = position>>3;
+    uint bytePosition = static_cast<uint>(position>>3);
     uint bitPosition = position%8;
     this->setBit(bytePosition, bitPosition, value);
 }
 
 void RandomAccessBinary::setBit(uint bytePosition, uint bitPosition, const bool &value)
 {
-    uint8_t byte = (*this->ptr_data)[bytePosition];
+    uint8_t byte = this->ptr_data->at(bytePosition);
     uint8_t newbyte = 1;
     if (value)
         newbyte = byte | (newbyte << (7-bitPosition));
     else {
         newbyte = byte & ~(newbyte << (7-bitPosition));
     }
-    (*this->ptr_data)[bytePosition] = newbyte;
+    ptr_data->insert(ptr_data->begin()+bytePosition, newbyte);
 }
 
 void RandomAccessBinary::setBits(uint64_t position, uint bits, const uint8_t &value)
@@ -68,7 +71,7 @@ void RandomAccessBinary::setBits(uint64_t position, uint bits, const uint8_t &va
 
 void RandomAccessBinary::setBits(uint bytePosition, uint bitPosition, uint bits, const uint8_t &value)
 {
-    uint8_t byte = (*this->ptr_data)[bytePosition];
+    uint8_t byte = this->ptr_data->at(bytePosition);
     uint8_t newbyte = value;
     uint8_t mask = 0;
     for(uint i = bits-1; i >= 0; --i)
@@ -77,94 +80,81 @@ void RandomAccessBinary::setBits(uint bytePosition, uint bitPosition, uint bits,
     byte &= ~mask;
     newbyte <<= (7-bits-bitPosition);
     byte |= newbyte;
-    (*this->ptr_data)[bytePosition] = byte;
+    ptr_data->insert(ptr_data->begin()+bytePosition, byte);
 }
 
 void RandomAccessBinary::set_uint16(uint byteOffset, const uint16_t &data)
 {
-    if (this->endianness == Endianness::BIG) {
-        this->setByte(byteOffset, (uint8_t)(data >> 8));
-        this->setByte(byteOffset+1, (uint8_t)(data & 0x0FF));
-    } else if (this->endianness == Endianness::LITTLE) {
-        this->setByte(byteOffset, (uint8_t)(data & 0x0FF));
-        this->setByte(byteOffset+1, (uint8_t)(data >> 8));
-    } else {
-        //TODO
-    }
+    uint8_t * conv = (uint8_t*)&data;
+    std::vector<uint8_t> tmp;
+    tmp.assign(conv, conv+sizeof(uint16_t));
+    if (this->endianness != Endianness::LITTLE)
+        std::reverse(tmp.begin(), tmp.end());
+    this->setBytes(byteOffset, tmp);
 }
 
 void RandomAccessBinary::set_uint32(uint byteOffset, const uint32_t &data)
 {
-    if (this->endianness == Endianness::BIG) {
-        this->setByte(byteOffset+0, (uint8_t)((data >> 24) & 0x0FF));
-        this->setByte(byteOffset+1, (uint8_t)((data >> 16) & 0x0FF));
-        this->setByte(byteOffset+2, (uint8_t)((data >> 8) & 0x0FF));
-        this->setByte(byteOffset+3, (uint8_t)(data & 0x0FF));
-    } else if (this->endianness == Endianness::LITTLE) {
-        this->setByte(byteOffset+3, (uint8_t)((data >> 24) & 0x0FF));
-        this->setByte(byteOffset+2, (uint8_t)((data >> 16) & 0x0FF));
-        this->setByte(byteOffset+1, (uint8_t)((data >> 8) & 0x0FF));
-        this->setByte(byteOffset+0, (uint8_t)(data & 0x0FF));
-    }
+    uint8_t * conv = (uint8_t*)&data;
+    std::vector<uint8_t> tmp;
+    tmp.assign(conv, conv+sizeof(uint32_t));
+    if (this->endianness != Endianness::LITTLE)
+        std::reverse(tmp.begin(), tmp.end());
+    this->setBytes(byteOffset, tmp);
 }
 
 void RandomAccessBinary::set_uint64(uint byteOffset, const uint64_t &data)
 {
-    if (this->endianness == Endianness::BIG) {
-        this->setByte(byteOffset+0, (uint8_t)((data >> 56) & 0x0FF));
-        this->setByte(byteOffset+1, (uint8_t)((data >> 48) & 0x0FF));
-        this->setByte(byteOffset+2, (uint8_t)((data >> 40) & 0x0FF));
-        this->setByte(byteOffset+3, (uint8_t)((data >> 32) & 0x0FF));
-        this->setByte(byteOffset+4, (uint8_t)((data >> 24) & 0x0FF));
-        this->setByte(byteOffset+5, (uint8_t)((data >> 16) & 0x0FF));
-        this->setByte(byteOffset+6, (uint8_t)((data >> 8) & 0x0FF));
-        this->setByte(byteOffset+7, (uint8_t)(data & 0x0FF));
-    } else if (this->endianness == Endianness::LITTLE) {
-        this->setByte(byteOffset+7, (uint8_t)((data >> 56) & 0x0FF));
-        this->setByte(byteOffset+6, (uint8_t)((data >> 48) & 0x0FF));
-        this->setByte(byteOffset+5, (uint8_t)((data >> 40) & 0x0FF));
-        this->setByte(byteOffset+4, (uint8_t)((data >> 32) & 0x0FF));
-        this->setByte(byteOffset+3, (uint8_t)((data >> 24) & 0x0FF));
-        this->setByte(byteOffset+2, (uint8_t)((data >> 16) & 0x0FF));
-        this->setByte(byteOffset+1, (uint8_t)((data >> 8) & 0x0FF));
-        this->setByte(byteOffset+0, (uint8_t)(data & 0x0FF));
-    }
+    uint8_t * conv = (uint8_t*)&data;
+    std::vector<uint8_t> tmp;
+    tmp.assign(conv, conv+sizeof(uint64_t));
+    if (this->endianness != Endianness::LITTLE)
+        std::reverse(tmp.begin(), tmp.end());
+    this->setBytes(byteOffset, tmp);
 }
 
 void RandomAccessBinary::set_float(uint position, float &data)
 {
-    float * conv = &data;
-    this->set_uint32(position, *conv);
+    uint8_t * conv = (uint8_t*)&data;
+    std::vector<uint8_t> tmp;
+    tmp.assign(conv, conv+sizeof(float));
+    if (this->endianness != Endianness::LITTLE)
+        std::reverse(tmp.begin(), tmp.end());
+    this->setBytes(position, tmp);
 }
 
 void RandomAccessBinary::set_double(uint position, double &data)
 {
-    double * conv = &data;
-    this->set_uint64(position, *conv);
+    uint8_t * conv = (uint8_t*)&data;
+    std::vector<uint8_t> tmp;
+    tmp.assign(conv, conv+sizeof(double));
+    if (this->endianness != Endianness::LITTLE)
+        std::reverse(tmp.begin(), tmp.end());
+    this->setBytes(position, tmp);
 }
 
 uint8_t RandomAccessBinary::getByte(uint position)
 {
-    return (*this->ptr_data)[position];
+    return this->ptr_data->at(position);
 }
 
 const std::vector<uint8_t> RandomAccessBinary::getBytes(uint position, uint length)
 {
-    std::vector<uint8_t> vec;
-    for(uint i = position; i< position+length; ++i)
-        vec.push_back((*this->ptr_data)[i]);
+    auto begin = ptr_data->begin() + position;
+    auto end = ptr_data->begin() + position + length;
+    std::vector<uint8_t> vec(begin, end);
     return vec;
 }
 
 bool RandomAccessBinary::getBit(uint byteOffset, uint bitOffset)
 {
-    uint8_t byte = (*this->ptr_data)[byteOffset];
+    uint8_t byte = this->ptr_data->at(byteOffset);
     return (byte & (1 << (7-bitOffset))) > 0;
 }
 
 bool RandomAccessBinary::getBit(uint64_t position)
 {
-    uint64_t byteOffset = position>>3;
+    uint byteOffset = static_cast<uint>(position>>3);
     uint bitOffset = position%8;
     return this->getBit(byteOffset, bitOffset);
 }
@@ -181,40 +171,95 @@ const std::vector<bool> RandomAccessBinary::getBits(uint64_t position, uint64_t
 
 uint16_t RandomAccessBinary::get_uint16(uint byteOffset)
 {
+    auto tmp = getBytes(byteOffset, sizeof(uint16_t));
+    if (endianness != Endianness::LITTLE)
+        std::reverse(tmp.begin(), tmp.end());
+    if (tmp.data() != nullptr) {
+        uint16_t* d = (uint16_t*)tmp.data();
+        return *d;
+    }
     return 0;
 }
 
 uint32_t RandomAccessBinary::get_uint32(uint byteOffset)
 {
+    auto tmp = getBytes(byteOffset, sizeof(uint32_t));
+    if (endianness != Endianness::LITTLE)
+        std::reverse(tmp.begin(), tmp.end());
+    if (tmp.data() != nullptr) {
+        uint32_t* d = (uint32_t*)tmp.data();
+        return *d;
+    }
     return 0;
 }
 
 uint64_t RandomAccessBinary::get_uint64(uint byteOffset)
 {
+    auto tmp = getBytes(byteOffset, sizeof(uint64_t));
+    if (endianness != Endianness::LITTLE)
+        std::reverse(tmp.begin(), tmp.end());
+    if (tmp.data() != nullptr) {
+        uint64_t* d = (uint64_t*)tmp.data();
+        return *d;
+    }
     return 0;
 }
 
 float RandomAccessBinary::get_float(uint byteOffset)
 {
-    return 0.0f;
+    float tmp = 0.0;
+    auto bytes = this->getBytes(byteOffset, sizeof(float));
+    uint8_t* ptr_tmp = (uint8_t*)&tmp;
+    if (endianness != Endianness::LITTLE) {
+        std::reverse(std::begin(bytes), std::end(bytes));
+    }
+    uint8_t i = 0;
+    for(auto it = bytes.begin(); it != bytes.end();++it, ++i)
+        *(ptr_tmp+i) = *it;
+    return tmp;
 }
 
 double RandomAccessBinary::get_double(uint byteOffset)
 {
-    return 0.0;
+    double tmp = 0.0;
+    auto bytes = this->getBytes(byteOffset, sizeof(double));
+    uint8_t* ptr_tmp = (uint8_t*)&tmp;
+    if (endianness != Endianness::LITTLE) {
+        std::reverse(std::begin(bytes), std::end(bytes));
+    }
+    uint8_t i = 0;
+    for(auto it = bytes.begin(); it != bytes.end();++it, ++i)
+        *(ptr_tmp+i) = *it;
+    return tmp;
 }
 
 std::__cxx11::string RandomAccessBinary::get_string(uint byteOffset, uint length)
 {
-    return "";
+    std::stringstream output;
+    uint i = 0;
+    for(auto it = ptr_data->begin(); it != ptr_data->end() && i < length; ++it, ++i) {
+        output << *it;
+    }
+    return output.str();
 }
 
 std::__cxx11::string RandomAccessBinary::get_hex_string(uint byteOffset, uint length)
 {
-    return "";
+    std::stringstream output;
+    output << std::hex << std::noshowbase << std::right << std::setfill('0');
+    uint i = 0;
+    for(auto it = ptr_data->begin()+byteOffset; it != ptr_data->end() && i < length; ++it, ++i) {
+        output << std::setw(2) << static_cast<int>(*it);
+    }
+    return output.str();
 }
 
 std::__cxx11::string RandomAccessBinary::get_hex_string()
 {
-    return "";
+    std::stringstream output;
+    output << std::hex << std::noshowbase << std::right << std::setfill('0');
+    for(auto it = ptr_data->begin(); it != ptr_data->end(); ++it) {
+        output << std::setw(2) << static_cast<int>(*it);
+    }
+    return output.str();
 }
diff --git a/src/core/RandomAccessBinary.h b/src/core/RandomAccessBinary.h
index 5846fb9..3eb4cb3 100644
--- a/src/core/RandomAccessBinary.h
+++ b/src/core/RandomAccessBinary.h
@@ -19,7 +19,9 @@ public:
     virtual ~RandomAccessBinary();
 
     void setEndianness(Endianness endianess);
-    const Endianness getEndianness();
+    Endianness getEndianness();
+
+    void clear() { ptr_data->clear(); }
 
     void setBytes(uint position, const std::vector<uint8_t>& data);
     void setByte(uint position, const uint8_t& data);
@@ -61,6 +63,8 @@ public:
 
     std::string get_hex_string(uint byteOffset, uint length);
     std::string get_hex_string();
+
+    uint64_t size() { return ptr_data->size(); }
 private:
     std::unique_ptr<std::vector<uint8_t>> ptr_data;
     Endianness endianness;
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 275686b..3093124 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -6,8 +6,9 @@ INCLUDE_DIRECTORIES(/usr/include/gtest)
 
 set(SOURCES
     core/test_tree.cpp
+    core/test_rab.cpp
 )
 
 add_executable(runUnitTests ${SOURCES})
-target_link_libraries(runUnitTests gtest gtest_main)
+target_link_libraries(runUnitTests gtest gtest_main core)
 add_test(runUnitTests runUnitTests)
diff --git a/test/core/test_rab.cpp b/test/core/test_rab.cpp
new file mode 100644
index 0000000..36a86ba
--- /dev/null
+++ b/test/core/test_rab.cpp
@@ -0,0 +1,92 @@
+
+#include <iostream>
+#include <string>
+#include "gtest/gtest.h"
+#include "../src/core/RandomAccessBinary.h"
+
+class RABTest : public ::testing::Test {
+protected:
+    virtual void SetUp(){
+        uint64_t bigdata = 0x0CAFEBABE;
+        test2.set_uint64(0, bigdata);
+        test4.setEndianness(RandomAccessBinary::Endianness::LITTLE);
+    }
+
+    virtual void TearDown(){
+        test.clear();
+        test2.clear();
+        test3.clear();
+        test4.clear();
+    }
+
+    RandomAccessBinary test;
+    RandomAccessBinary test2;
+    RandomAccessBinary test3;
+    RandomAccessBinary test4;
+};
+
+TEST_F(RABTest, IsEmptyInitially) {
+    EXPECT_EQ(0, test.size());
+    EXPECT_EQ("", test.get_hex_string());
+}
+
+TEST_F(RABTest, SomeData) {
+    EXPECT_EQ(8, test2.size());
+    EXPECT_EQ("00000000cafebabe", test2.get_hex_string());
+    EXPECT_EQ("cafebabe", test2.get_hex_string(4,4));
+}
+
+TEST_F(RABTest, Double) {
+    //double a = 3.1415;
+    double a = 2.7182818284;
+    test3.set_double(0, a);
+    EXPECT_EQ("4005bf0a8b12500b", test3.get_hex_string());
+    EXPECT_DOUBLE_EQ(2.7182818284, test3.get_double(0));
+    // LITTLE ENDIAN
+    test4.set_double(0, a);
+    EXPECT_EQ("0b50128b0abf0540", test4.get_hex_string());
+    EXPECT_DOUBLE_EQ(2.7182818284, test4.get_double(0));
+}
+
+TEST_F(RABTest, Float) {
+    float a = 2.71828f;
+    test3.set_float(0, a);
+    EXPECT_EQ("402df84d", test3.get_hex_string());
+    EXPECT_FLOAT_EQ(2.71828f, test3.get_float(0));
+    // LITTLE ENDIAN
+    test4.set_float(0, a);
+    EXPECT_EQ("4df82d40", test4.get_hex_string());
+    EXPECT_FLOAT_EQ(2.71828f, test4.get_float(0));
+}
+
+TEST_F(RABTest, VariousInteger) {
+    uint8_t byte = 42;
+    uint16_t a_short = 31337;
+    uint32_t a_int = 0xdeadbeef;
+    uint64_t a_long = 0xcafebabedeadbeef;
+
+    test3.setByte(0, byte);
+    test3.set_uint16(1, a_short);
+    test3.set_uint32(3, a_int);
+    test3.set_uint64(7, a_long);
+
+    test4.setByte(0, byte);
+    test4.set_uint16(1, a_short);
+    test4.set_uint32(3, a_int);
+    test4.set_uint64(7, a_long);
+    std::cout << "BIG ENDIAN: " << test3.get_hex_string() << std::endl;
+    std::cout << "LITTLE ENDIAN: "<< test4.get_hex_string() << std::endl;
+    EXPECT_EQ("2a7a69deadbeefcafebabedeadbeef", test3.get_hex_string());
+    EXPECT_EQ("2a697aefbeaddeefbeaddebebafeca", test4.get_hex_string());
+}
+
+TEST_F(RABTest, Strings) {
+    std::string a = "Dies ist ein Test.";
+    test3.setBytes(0, std::vector<uint8_t>(a.begin(), a.end()));
+    EXPECT_EQ("Dies ist ein Test.", test3.get_string(0, test3.size()));
+    EXPECT_EQ("44696573206973742065696e20546573742e", test3.get_hex_string());
+}
+
+TEST_F(RABTest, Bits) {
+
+}