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1 #include <iostream>
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2 #include <fstream>
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3 using namespace std;
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4
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5 class tagTT
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6 {
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7 public:
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8 unsigned char buf;
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9 char *cont;
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10 int nlen;
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11 };
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12
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13
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14 unsigned char CtoNum(int c)
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15 {
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16 if (c >= 'A' && c <= 'Z') return c-'A';
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17 if (c >= 'a' && c <= 'z') return (c - 'a')+26;
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18 if (c >= '0' && c <= '9') return (c - '0')+52;
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19 if (c == '+') return 62;
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20 if (c == '/') return 63;
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21 return 0;
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22 }
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23
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24
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25 int GetNumB64(tagTT &pWork)
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26 {
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27 char wr;
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28 unsigned char w;
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29 unsigned char r;
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30
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31 wr = *pWork.cont;
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32 pWork.cont++;
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33 if (wr=='\0' || wr=='=')
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34 return -1;
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35
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36 while(wr=='\n' || wr=='\t')
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37 {
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38 wr = *pWork.cont;
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39 pWork.cont++;
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40 }
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41
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42 w = CtoNum(wr);
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43 if (pWork.nlen == 0)
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44 {
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45 unsigned char w2;
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46
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47 wr = *pWork.cont;
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48 pWork.cont++;
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49 if (wr!='\0' && wr!='=')
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50 w2 = CtoNum(wr);
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51 else
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52 w2 = 0;
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53
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54 pWork.buf = w << 2;
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55 w = w2;
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56 pWork.nlen = 6;
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57 }
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58
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59 pWork.nlen -= 2;
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60
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61 r = pWork.buf | (w >> pWork.nlen);
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62
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63 pWork.buf = (w << (8 - pWork.nlen));
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64 return r;
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65 }
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66
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67
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68 //int decode(char *cont, char *file_name)
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69 int decode(char *cont, FILE *outfile)
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70 {
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71 int rw;
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72 tagTT work;
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73
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74 //ofstream outfile(file_name);
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75
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76 work.buf = 0;
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77 work.nlen = 0;
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78 work.cont = cont;
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79
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80 rw = GetNumB64(work);
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81 while ( rw != -1 )
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82 {
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83 //outfile << (char)rw;
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84 putc(rw, outfile);
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85 rw = GetNumB64(work);
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86 }
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87
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88 //outfile.close();
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89
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90 return 0;
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91 }
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