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1 #ifndef TABLE_HPP
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2 #define TABLE_HPP
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3
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4 #include <iostream>
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5 #include <fstream>
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6 #include <string>
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7 #include <stdio.h>
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8 using namespace std;
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9
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10 typedef unsigned int Value;
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11 static const unsigned int SENTINEL = -1;
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12
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13 class Table {
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14 private:
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15 int sentinel;
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16 Value *values;
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17
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18 public:
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19 string fileName;
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20 unsigned int width;
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21 unsigned int height;
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22 fstream file;
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23
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24 Table (string fileName, unsigned int width, unsigned int height): sentinel(-1), fileName(fileName), width(width), height(height) {
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25 file.open(fileName.c_str(), ios::out | ios::in | ios::binary);
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26 Value v = 0;
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27 for (unsigned int i = 0; i < width * height; i++) {
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28 writeHere(v);
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29 }
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30 file.flush();
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31 values = new Value[width];
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32 }
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33
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34 ~Table () {
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35 delete[] values;
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36 }
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37
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38 void moveTo (unsigned int col, unsigned int line) {
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39 if (col == SENTINEL) {
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40 sentinel = line;
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41 }
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42 else {
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43 sentinel = -1;
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44 file.seekp((col * width + line) * sizeof(Value));
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45 }
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46 }
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47
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48 void write (Value v, unsigned int col, unsigned int line) {
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49 moveTo(col, line);
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50 writeHere(v);
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51 }
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52
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53 void writeHere(Value v) {
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54 if (sentinel >= 0)
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55 values[sentinel] = v;
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56 else
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57 file.write(reinterpret_cast<const char*>(&v), sizeof(Value));
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58 }
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59
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60
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61 Value read (unsigned int col, unsigned int line) {
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62 moveTo(col, line);
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63 return readHere();
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64 }
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65
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66 Value readHere () {
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67 if (sentinel >= 0) {
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68 return values[sentinel];
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69 }
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70 else {
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71 Value v;
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72 file.read(reinterpret_cast<char*>(&v), sizeof(Value));
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73 return v;
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74 }
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75 }
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76
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77 void destroy () {
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78 file.close();
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79 remove(fileName.c_str());
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80 }
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81
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82 };
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83
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84 #endif
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