consolidate all repos to one for archive

semester_5/racunalniska_vecpredstavnost/vaja_2/include/BitReader.h

@@ -0,0 +1,44 @@
+#pragma once
+#include "Buffer.h"
+
+class BitReader
+{
+public:
+  int k = 8;
+  Buffer buffer;
+  char x = 0;
+  size_t pos = 0;
+
+  int readInt()
+  {
+    int ret = *(int *)&buffer.buffer[pos];
+    pos += 4;
+    return ret;
+  }
+
+  unsigned short int readShort()
+  {
+    short ret = *(unsigned short int *)&buffer.buffer[pos];
+    pos += 2;
+    return ret;
+  }
+
+  char readByte()
+  {
+    x = buffer.buffer[pos];
+    pos++;
+    return x;
+  }
+
+  bool readBit()
+  {
+    if (k == 8)
+    {
+      readByte();
+      k = 0;
+    }
+    bool b = (x >> k) & 1;
+    k++;
+    return b;
+  }
+};

semester_5/racunalniska_vecpredstavnost/vaja_2/include/BitWriter.h

@@ -0,0 +1,43 @@
+#pragma once
+#include "Buffer.h"
+
+class BitWriter
+{
+public:
+  int k = 0;
+  Buffer buffer;
+  char x = 0;
+
+  void writeByte(uint8_t v)
+  {
+    buffer.add_end(&v, sizeof(v));
+  }
+
+  void writeInt(int v)
+  {
+    buffer.add_end((uint8_t *)&v, sizeof(v));
+  }
+
+  void write16(unsigned short int v)
+  {
+    buffer.add_end((uint8_t *)&v, sizeof(v));
+  }
+
+  void writeBit(bool b)
+  {
+    if (k == 8)
+    {
+      writeByte(x);
+      k = 0;
+      x = 0;
+    }
+    x ^= (-b ^ x) & (1 << k);
+    k++;
+  }
+
+  void finish()
+  {
+    if (k > 0)
+      writeByte(x);
+  }
+};

semester_5/racunalniska_vecpredstavnost/vaja_2/include/Buffer.h

@@ -0,0 +1,37 @@
+#pragma once
+#include <cstdint>
+#include <string>
+
+class Buffer
+{
+public:
+  uint8_t *buffer = nullptr;
+  size_t taken = 0;
+  size_t size = 0;
+  std::string file_path;
+
+  Buffer(size_t size);
+  Buffer();
+  ~Buffer();
+  bool resize(size_t new_size);
+  int add_end(uint8_t *data, size_t data_size);
+  int add_middle(uint8_t *data, size_t data_size, size_t index);
+  void copy(Buffer &other);
+
+  // Removes data from buffer without checking if it's in the buffer
+  void remove_fast(uint8_t *data, size_t data_size);
+
+  void remove(size_t index, size_t data_size);
+
+  int find(uint8_t *data, size_t data_size);
+
+  void remove(uint8_t *data, size_t data_size);
+
+  void clear() { taken = 0; }
+
+  bool save_to_file();
+  bool save_to_file(std::string file_path);
+
+  bool load_from_file();
+  bool load_from_file(std::string file_path);
+};

semester_5/racunalniska_vecpredstavnost/vaja_2/include/compressor.h

@@ -0,0 +1,15 @@
+#include <vector>
+#include <cstdint>
+#include "BitWriter.h"
+
+class Compressor
+{
+public:
+  BitWriter writer;
+  void compress(std::vector<std::vector<uint8_t>> &matrix);
+
+private:
+  void IC(std::vector<int> &C, int L, int H);
+  std::vector<int> predict(std::vector<std::vector<uint8_t>> &P);
+  void encode(int v, int g);
+};

semester_5/racunalniska_vecpredstavnost/vaja_2/include/decompressor.h

@@ -0,0 +1,14 @@
+#pragma once
+#include "BitReader.h"
+#include <vector>
+class Decompressor
+{
+public:
+  std::vector<unsigned char> decompress();
+
+  BitReader reader;
+
+  int decode(int g);
+  void DEIC(std::vector<int> &C, int L, int H);
+  std::vector<unsigned char> predictInvers(std::vector<int> &E, int width, int hight);
+};

semester_5/racunalniska_vecpredstavnost/vaja_2/include/utils.h

@@ -0,0 +1,325 @@
+#pragma once
+
+/*
+  #define VECTOR_UTILS
+  #define BUFFER
+*/
+
+#include <vector>
+#include <cstdint>
+#include <string>
+#include <iostream>
+#include <fstream>
+#include <cstring>
+
+#ifdef BUFFER
+class Buffer
+{
+public:
+  uint8_t *buffer = nullptr;
+  size_t taken = 0;
+  size_t size = 0;
+  std::string file_path;
+
+  Buffer(size_t size);
+  Buffer();
+  ~Buffer();
+  bool resize(size_t new_size);
+  int add_end(uint8_t *data, size_t data_size);
+  int add_middle(uint8_t *data, size_t data_size, size_t index);
+  void copy(Buffer &other);
+
+  // Removes data from buffer without checking if it's in the buffer
+  void remove_fast(uint8_t *data, size_t data_size);
+
+  void remove(size_t index, size_t data_size);
+
+  int find(uint8_t *data, size_t data_size);
+
+  void remove(uint8_t *data, size_t data_size);
+
+  void clear() { taken = 0; }
+
+  bool save_to_file();
+  bool save_to_file(std::string file_path);
+
+  bool load_from_file();
+  bool load_from_file(std::string file_path);
+};
+
+Buffer::Buffer()
+{
+  buffer = nullptr;
+  size = 0;
+  taken = 0;
+}
+
+Buffer::Buffer(size_t size)
+{
+  this->size = size;
+  this->buffer = new uint8_t[size];
+}
+
+Buffer::~Buffer()
+{
+  if (buffer)
+    delete[] buffer;
+}
+
+bool Buffer::resize(size_t new_size)
+{
+  if (size >= new_size)
+    return true;
+  if (new_size < size * 2)
+    new_size = size * 2;
+  uint8_t *new_buffer = (uint8_t *)realloc(buffer, new_size);
+  if (!new_buffer)
+  {
+    printf("Error resizing buffer\n");
+    return false;
+  }
+  buffer = new_buffer;
+  size = new_size;
+  return true;
+}
+
+int Buffer::add_end(uint8_t *data, size_t data_size)
+{
+  if (taken + data_size > size)
+    if (!resize(size + data_size))
+      return -1;
+
+  memcpy(buffer + taken, data, data_size);
+  taken += data_size;
+  return taken - data_size;
+}
+
+int Buffer::add_middle(uint8_t *data, size_t data_size, size_t index)
+{
+  if (taken + data_size > size)
+    if (!resize(size + data_size))
+      return -1;
+  memmove(buffer + index + data_size, buffer + index, taken - index);
+  memcpy(buffer + index, data, data_size);
+  taken += data_size;
+  return index;
+}
+
+void Buffer::copy(Buffer &other)
+{
+  if (other.size > size)
+    if (!resize(other.size))
+      return;
+  memcpy(buffer, other.buffer, other.taken);
+  taken = other.taken;
+}
+
+void Buffer::remove_fast(uint8_t *data, size_t data_size)
+{
+  int64_t index = data - buffer;
+  if (index < 0 || index > taken || index + data_size > taken)
+  {
+    printf("Error removing from buffer\n");
+    return;
+  }
+  memmove(buffer + index, buffer + index + data_size, taken - index - data_size);
+  taken -= data_size;
+}
+
+void Buffer::remove(size_t index, size_t data_size)
+{
+  if (index + data_size > taken)
+  {
+    printf("Error removing from buffer\n");
+    return;
+  }
+  memmove(buffer + index, buffer + index + data_size, taken - index - data_size);
+  taken -= data_size;
+}
+
+int Buffer::find(uint8_t *data, size_t data_size)
+{
+  for (int i = 0; i < taken; i++)
+    if (memcmp(buffer + i, data, data_size) == 0)
+      return i;
+
+  return -1;
+}
+
+void Buffer::remove(uint8_t *data, size_t data_size)
+{
+  int index = find(data, data_size);
+  if (index == -1)
+  {
+    printf("Error removing from buffer\n");
+    return;
+  }
+  remove(index, data_size);
+}
+
+bool Buffer::save_to_file()
+{
+  std::ofstream file(this->file_path, std::ios::binary | std::ios::out);
+  if (!file.is_open())
+  {
+    printf("Error saving file\n");
+    return false;
+  }
+  file.write((char *)this->buffer, this->taken);
+  file.close();
+  return true;
+}
+
+bool Buffer::save_to_file(std::string file_path)
+{
+  this->file_path = file_path;
+  return save_to_file();
+}
+
+bool Buffer::load_from_file()
+{
+  std::ifstream file(this->file_path, std::ios::binary | std::ios::in);
+  if (!file.is_open())
+    return false;
+
+  file.seekg(0, std::ios::end);
+
+  size_t file_size = file.tellg();
+  resize(file_size);
+
+  file.seekg(0, std::ios::beg);
+  file.read((char *)buffer, size);
+
+  if (file)
+    taken = file_size;
+  else
+    taken = file.gcount();
+
+  file.close();
+  return true;
+}
+
+bool Buffer::load_from_file(std::string file_path)
+{
+  this->file_path = file_path;
+  return load_from_file();
+}
+
+#endif // BUFFER
+
+#ifdef BIT_READER
+
+class BitReader
+{
+public:
+  int k = 8;
+  Buffer buffer;
+  char x = 0;
+  size_t pos = 0;
+
+  int readInt()
+  {
+    int ret = *(int *)&buffer.buffer[pos];
+    pos += 4;
+    return ret;
+  }
+
+  unsigned short int readShort()
+  {
+    short ret = *(unsigned short int *)&buffer.buffer[pos];
+    pos += 2;
+    return ret;
+  }
+
+  char readByte()
+  {
+    x = buffer.buffer[pos];
+    pos++;
+    return x;
+  }
+
+  bool readBit()
+  {
+    if (k == 8)
+    {
+      readByte();
+      k = 0;
+    }
+    bool b = (x >> k) & 1;
+    k++;
+    return b;
+  }
+};
+#endif // BIT_READER
+
+#ifdef BIT_WRITER
+
+class BitWriter
+{
+public:
+  int k = 0;
+  Buffer buffer;
+  char x = 0;
+
+  void writeByte(uint8_t v)
+  {
+    buffer.add_end(&v, sizeof(v));
+  }
+
+  void writeInt(int v)
+  {
+    buffer.add_end((uint8_t *)&v, sizeof(v));
+  }
+
+  void write16(unsigned short int v)
+  {
+    buffer.add_end((uint8_t *)&v, sizeof(v));
+  }
+
+  void writeBit(bool b)
+  {
+    if (k == 8)
+    {
+      writeByte(x);
+      k = 0;
+      x = 0;
+    }
+    x ^= (-b ^ x) & (1 << k);
+    k++;
+  }
+
+  void finish()
+  {
+    if (k > 0)
+      writeByte(x);
+  }
+};
+#endif // BIT_WRITER
+
+#ifdef VECTOR_UTILS
+template <typename T>
+void print_vec(std::vector<T> &vec, int wrap = 5)
+{
+  for (size_t i = 0; i < vec.size(); i++)
+  {
+    printf("%2d ", vec[i]);
+    if (i % wrap == wrap - 1)
+      printf("\n");
+  }
+  printf("\n");
+}
+
+template <typename T>
+void print_matrix(std::vector<std::vector<T>> &vec)
+{
+  for (size_t i = 0; i < vec.size(); i++)
+  {
+    for (size_t j = 0; j < vec[i].size(); j++)
+    {
+      printf("%2d ", vec[i][j]);
+    }
+    printf("\n");
+  }
+  printf("\n");
+}
+#endif // VECTOR_UTILS

semester_5/racunalniska_vecpredstavnost/vaja_2/main.cpp

@@ -0,0 +1,131 @@
+#include <iostream>
+#include <vector>
+#include <cmath>
+#include <chrono>
+#include <ctime>
+#include <optional>
+#include <filesystem>
+
+#include "compressor.h"
+#include "decompressor.h"
+
+#define STB_IMAGE_IMPLEMENTATION
+#include "stb_image.h"
+#define STB_IMAGE_WRITE_IMPLEMENTATION
+#include "stb_image_write.h"
+
+struct ResultS
+{
+  int original;
+  int compressed;
+  int64_t compression_time;
+  int64_t decompression_time;
+};
+
+std::optional<ResultS> run(const char *filepath)
+{
+  int x, y, n;
+  unsigned char *data = stbi_load(filepath, &x, &y, &n, 1);
+  if (data == NULL)
+  {
+    printf("Error loading image!\n");
+    return std::nullopt;
+  }
+
+  std::vector<std::vector<unsigned char>> matrix(x, std::vector<unsigned char>(y));
+  for (int i = 0; i < x; i++)
+  {
+    for (int j = 0; j < y; j++)
+    {
+      matrix[i][j] = data[i * y + j];
+    }
+  }
+  delete[] data;
+
+  Compressor com;
+
+  auto startCom = std::chrono::high_resolution_clock::now();
+  com.compress(matrix);
+  auto endCom = std::chrono::high_resolution_clock::now();
+
+  Decompressor dec;
+
+  dec.reader.buffer.copy(com.writer.buffer);
+
+  auto startDec = std::chrono::high_resolution_clock::now();
+  std::vector<unsigned char> ret = dec.decompress();
+  auto endDec = std::chrono::high_resolution_clock::now();
+
+  stbi_write_bmp("out.bmp", x, y, 1, ret.data());
+
+  auto compTime = std::chrono::duration_cast<std::chrono::milliseconds>(endCom - startCom);
+  auto decTime = std::chrono::duration_cast<std::chrono::milliseconds>(endDec - startDec);
+
+  ResultS res;
+  res.original = x * y;
+  res.compressed = com.writer.buffer.taken;
+  res.compression_time = compTime.count();
+  res.decompression_time = decTime.count();
+
+  return res;
+}
+// ... x = width, y = height
+// Velikost original, Velikost stisnjena, Razmerje (orig./stisn.), Čas kompresije, Čas dekompresije,
+int main(int argc, char **argv)
+{
+  if (false)
+  {
+    std::optional<ResultS> ret = run("slike/Sunrise.bmp");
+    if (ret.has_value())
+    {
+      ResultS res = ret.value();
+      printf("%9d\t", res.original);
+      printf("%9d\t", res.compressed);
+      printf("%9f\t", (float)res.original / (float)res.compressed);
+      printf("%9ld\t", res.compression_time);
+      printf("%9ld\t", res.decompression_time);
+      printf("%s", "slike/Sunrise.bmp");
+      printf("\n");
+    }
+
+    return 0;
+  }
+
+  printf("%9s\t%9s\t%9s\t%9s\t%9s\t\n", "Original", "Comp.", "Ratio", "Comp. ms", "Dec. ms");
+
+  std::string directory_path = "slike/";
+
+  std::vector<std::string> files;
+
+  // Iterate over the files in the directory
+  for (const auto &entry : std::filesystem::directory_iterator(directory_path))
+  {
+    // Check if the entry is a regular file
+    if (std::filesystem::is_regular_file(entry.path()))
+    {
+      files.push_back(entry.path().string());
+    }
+  }
+
+  std::sort(files.begin(), files.end());
+
+  for (auto file : files)
+  {
+    // std::cout << file << std::endl;
+    // if (file == "slike/Sunrise.bmp") continue;
+
+    std::optional<ResultS> ret = run(file.c_str());
+    if (ret.has_value())
+    {
+      ResultS res = ret.value();
+      printf("%9d\t", res.original);
+      printf("%9d\t", res.compressed);
+      printf("%9f\t", (float)res.original / (float)res.compressed);
+      printf("%9ld\t", res.compression_time);
+      printf("%9ld\t", res.decompression_time);
+      printf("%s", file.c_str());
+      printf("\n");
+    }
+  }
+  return 0;
+}

semester_5/racunalniska_vecpredstavnost/vaja_2/makefile

@@ -0,0 +1,27 @@
+CC=g++
+
+CFLAGS= -std=c++23
+
+INCLUDE_DIR= include
+
+SRC_DIR= src
+
+# Get all cpp files from src directory
+SRCS := $(wildcard $(SRC_DIR)/*.cpp)
+
+all: main run
+
+main:  main.cpp $(SRCS) $(INCLUDE_DIR)/*.h
+	$(CC) $(CFLAGS) -O3 -I $(INCLUDE_DIR) $(SRCS) main.cpp -o main
+
+debug:  main.cpp $(SRCS)
+	$(CC) $(CFLAGS) -I$(INCLUDE_DIR) $(SRCS) -g main.cpp -o main
+
+run: main
+	./main 
+
+zip:
+	zip -r main.zip main.cpp $(INCLUDE_DIR) $(SRC_DIR) makefile
+
+clean:
+	rm main

semester_5/racunalniska_vecpredstavnost/vaja_2/src/Buffer.cpp

@@ -0,0 +1,162 @@
+#include "Buffer.h"
+#include <iostream>
+#include <fstream>
+#include <cstring>
+
+Buffer::Buffer()
+{
+  buffer = nullptr;
+  size = 0;
+  taken = 0;
+}
+
+Buffer::Buffer(size_t size)
+{
+  this->size = size;
+  this->buffer = new uint8_t[size];
+}
+
+Buffer::~Buffer()
+{
+  if (buffer)
+    delete[] buffer;
+}
+
+bool Buffer::resize(size_t new_size)
+{
+  if (size >= new_size)
+    return true;
+  if (new_size < size * 2)
+    new_size = size * 2;
+  uint8_t *new_buffer = (uint8_t *)realloc(buffer, new_size);
+  if (!new_buffer)
+  {
+    printf("Error resizing buffer\n");
+    return false;
+  }
+  buffer = new_buffer;
+  size = new_size;
+  return true;
+}
+
+int Buffer::add_end(uint8_t *data, size_t data_size)
+{
+  if (taken + data_size > size)
+    if (!resize(size + data_size))
+      return -1;
+
+  memcpy(buffer + taken, data, data_size);
+  taken += data_size;
+  return taken - data_size;
+}
+
+int Buffer::add_middle(uint8_t *data, size_t data_size, size_t index)
+{
+  if (taken + data_size > size)
+    if (!resize(size + data_size))
+      return -1;
+  memmove(buffer + index + data_size, buffer + index, taken - index);
+  memcpy(buffer + index, data, data_size);
+  taken += data_size;
+  return index;
+}
+
+void Buffer::copy(Buffer &other)
+{
+  if (other.size > size)
+    if (!resize(other.size))
+      return;
+  memcpy(buffer, other.buffer, other.taken);
+  taken = other.taken;
+}
+
+void Buffer::remove_fast(uint8_t *data, size_t data_size)
+{
+  int64_t index = data - buffer;
+  if (index < 0 || index > taken || index + data_size > taken)
+  {
+    printf("Error removing from buffer\n");
+    return;
+  }
+  memmove(buffer + index, buffer + index + data_size, taken - index - data_size);
+  taken -= data_size;
+}
+
+void Buffer::remove(size_t index, size_t data_size)
+{
+  if (index + data_size > taken)
+  {
+    printf("Error removing from buffer\n");
+    return;
+  }
+  memmove(buffer + index, buffer + index + data_size, taken - index - data_size);
+  taken -= data_size;
+}
+
+int Buffer::find(uint8_t *data, size_t data_size)
+{
+  for (int i = 0; i < taken; i++)
+    if (memcmp(buffer + i, data, data_size) == 0)
+      return i;
+
+  return -1;
+}
+
+void Buffer::remove(uint8_t *data, size_t data_size)
+{
+  int index = find(data, data_size);
+  if (index == -1)
+  {
+    printf("Error removing from buffer\n");
+    return;
+  }
+  remove(index, data_size);
+}
+
+bool Buffer::save_to_file()
+{
+  std::ofstream file(this->file_path, std::ios::binary | std::ios::out);
+  if (!file.is_open())
+  {
+    printf("Error saving file\n");
+    return false;
+  }
+  file.write((char *)this->buffer, this->taken);
+  file.close();
+  return true;
+}
+
+bool Buffer::save_to_file(std::string file_path)
+{
+  this->file_path = file_path;
+  return save_to_file();
+}
+
+bool Buffer::load_from_file()
+{
+  std::ifstream file(this->file_path, std::ios::binary | std::ios::in);
+  if (!file.is_open())
+    return false;
+
+  file.seekg(0, std::ios::end);
+
+  size_t file_size = file.tellg();
+  resize(file_size);
+
+  file.seekg(0, std::ios::beg);
+  file.read((char *)buffer, size);
+
+  if (file)
+    taken = file_size;
+  else
+    taken = file.gcount();
+
+  file.close();
+  return true;
+}
+
+bool Buffer::load_from_file(std::string file_path)
+{
+  this->file_path = file_path;
+  return load_from_file();
+}

semester_5/racunalniska_vecpredstavnost/vaja_2/src/compressor.cpp

@@ -0,0 +1,98 @@
+#include "compressor.h"
+#include <iostream>
+#include <cmath>
+
+std::vector<int> Compressor::predict(std::vector<std::vector<uint8_t>> &P)
+{
+  int hight = P.size();
+  int width = P[0].size();
+  std::vector<int> E(hight * width, 0);
+
+  E[0] = P[0][0];
+
+  for (size_t i = 1; i < width; i++)
+  {
+    E[i] = P[0][i - 1] - P[0][i];
+  }
+
+  for (size_t i = 1; i < hight; i++)
+  {
+    E[i * width] = P[i - 1][0] - P[i][0];
+  }
+
+  for (size_t y = 1; y < hight; y++)
+  {
+    for (size_t x = 1; x < width; x++)
+    {
+      if (P[y - 1][x - 1] >= std::max(P[y][x - 1], P[y - 1][x]))
+      {
+        E[y * width + x] = std::min(P[y][x - 1], P[y - 1][x]) - P[y][x];
+      }
+      else if (P[y - 1][x - 1] <= std::min(P[y][x - 1], P[y - 1][x]))
+      {
+        E[y * width + x] = std::max(P[y][x - 1], P[y - 1][x]) - P[y][x];
+      }
+      else
+      {
+        E[y * width + x] = P[y][x - 1] + P[y - 1][x] - P[y - 1][x - 1] - P[y][x];
+      }
+    }
+  }
+
+  return E;
+}
+
+void Compressor::encode(int v, int g)
+{
+  for (int i = 0; i < g; ++i)
+  {
+    writer.writeBit((v >> i) & 1);
+  }
+}
+
+void Compressor::IC(std::vector<int> &C, int L, int H)
+{
+  if (H - L <= 1)
+    return;
+  if (C[H] == C[L])
+    return;
+
+  int m = (H + L) / 2;
+  int g = std::ceil(std::log2(C[H] - C[L] + 1));
+
+  encode(C[m] - C[L], g);
+
+  if (L < m)
+    IC(C, L, m);
+  if (m < H)
+    IC(C, m, H);
+}
+
+void Compressor::compress(std::vector<std::vector<uint8_t>> &matrix)
+{
+  std::vector<int> E = predict(matrix);
+
+  std::vector<int> N(E.size(), 0);
+  N[0] = E[0];
+  for (size_t i = 1; i < E.size(); i++)
+  {
+    if (E[i] >= 0)
+      N[i] = 2 * E[i];
+    else
+      N[i] = 2 * std::abs(E[i]) - 1;
+  }
+
+  std::vector<int> C(N.size(), 0);
+  C[0] = N[0];
+  for (size_t i = 1; i < C.size(); i++)
+  {
+    C[i] = C[i - 1] + N[i];
+  }
+  writer.write16(matrix.size());
+  writer.writeByte(E[0]);
+  writer.writeInt(C[C.size() - 1]);
+  writer.writeInt(C.size());
+
+  IC(C, 0, C.size() - 1);
+  writer.finish();
+}

semester_5/racunalniska_vecpredstavnost/vaja_2/src/decompressor.cpp

@@ -0,0 +1,119 @@
+#
+#include <vector>
+#include <cmath>
+#include <iostream>
+
+#include "decompressor.h"
+#include "BitReader.h"
+
+int Decompressor::decode(int g)
+{
+  int v = 0;
+  for (int i = 0; i < g; i++)
+  {
+    bool bit = reader.readBit();
+    v |= bit << i;
+  }
+  return v;
+}
+
+void Decompressor::DEIC(std::vector<int> &C, int L, int H)
+{
+  if (H - L <= 1)
+    return;
+
+  if (C[L] == C[H])
+  {
+    for (size_t i = L + 1; i < H; i++)
+    {
+      C[i] = C[L];
+    }
+  }
+  else
+  {
+    int M = (L + H) / 2;
+
+    int G = std::ceil(std::log2(C[H] - C[L] + 1));
+    C[M] = C[L] + decode(G);
+    if (L < M)
+      DEIC(C, L, M);
+    if (M < H)
+      DEIC(C, M, H);
+  }
+}
+
+std::vector<unsigned char> Decompressor::predictInvers(std::vector<int> &E, int width, int hight)
+{
+  std::vector<unsigned char> matrix1(width * hight, 0);
+  matrix1[0] = E[0];
+
+  for (size_t i = 1; i < width; i++)
+  {
+    matrix1[i] = matrix1[i - 1] - E[i];
+  }
+
+  for (size_t i = 1; i < hight; i++)
+  {
+    matrix1[i * width] = matrix1[(i - 1) * width] - E[i * width];
+  }
+
+  for (size_t i = 1; i < hight; i++)
+  {
+    for (size_t j = 1; j < width; j++)
+    {
+      if (matrix1[(i - 1) * width + j - 1] >= std::max(matrix1[i * width + j - 1], matrix1[(i - 1) * width + j]))
+      {
+        matrix1[i * width + j] = std::min(matrix1[i * width + j - 1], matrix1[(i - 1) * width + j]) - E[i * width + j];
+      }
+      else if (matrix1[(i - 1) * width + j - 1] <= std::min(matrix1[i * width + j - 1], matrix1[(i - 1) * width + j]))
+      {
+        matrix1[i * width + j] = std::max(matrix1[i * width + j - 1], matrix1[(i - 1) * width + j]) - E[i * width + j];
+      }
+      else
+      {
+        matrix1[i * width + j] = matrix1[i * width + j - 1] + matrix1[(i - 1) * width + j] - matrix1[(i - 1) * width + j - 1] - E[i * width + j];
+      }
+    }
+  }
+
+  return matrix1;
+}
+
+std::vector<unsigned char> Decompressor::decompress()
+{
+
+  int hight = reader.readShort();
+  int first = reader.readByte();
+  int last = reader.readInt();
+  int size = reader.readInt();
+  int width = size / hight;
+
+  std::vector<int> C(size, 0);
+  C[0] = first;
+  C[size - 1] = last;
+  DEIC(C, 0, size - 1);
+
+  std::vector<int> N(size, 0);
+  N[0] = C[0];
+  for (size_t i = 1; i < size; i++)
+  {
+    N[i] = C[i] - C[i - 1];
+  }
+
+  std::vector<int> E(size, 0);
+  E[0] = N[0];
+
+  for (size_t i = 1; i < size; i++)
+  {
+    if (N[i] % 2 == 0)
+    {
+      E[i] = N[i] / 2;
+    }
+    else
+    {
+      E[i] = -((N[i] + 1) / 2);
+    }
+  }
+
+  return predictInvers(E, width, hight);
+}