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1 #include <stdio.h>
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2 //#include <iostream>
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3 #include <fstream>
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4 using namespace std;
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5
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6 class tagTT
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7 {
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8 public:
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9 unsigned char buf;
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10 char *cont;
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11 int nlen;
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12 };
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13
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14
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15 unsigned char CtoNum(int c)
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16 {
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17 if (c >= 'A' && c <= 'Z') return c-'A';
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18 if (c >= 'a' && c <= 'z') return (c - 'a')+26;
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19 if (c >= '0' && c <= '9') return (c - '0')+52;
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20 if (c == '+') return 62;
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21 if (c == '/') return 63;
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22 return 0;
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23 }
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24
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25
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26 int GetNumB64(tagTT &pWork)
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27 {
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28 char wr;
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29 unsigned char w;
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30 unsigned char r;
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31
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32 wr = *pWork.cont;
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33 pWork.cont++;
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34 if (wr=='\0' || wr=='=')
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35 return -1;
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36
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37 while(wr=='\n' || wr=='\t')
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38 {
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39 wr = *pWork.cont;
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40 pWork.cont++;
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41 }
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42
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43 w = CtoNum(wr);
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44 if (pWork.nlen == 0)
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45 {
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46 unsigned char w2;
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47
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48 wr = *pWork.cont;
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49 pWork.cont++;
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50 if (wr!='\0' && wr!='=')
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51 w2 = CtoNum(wr);
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52 else
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53 w2 = 0;
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54
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55 pWork.buf = w << 2;
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56 w = w2;
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57 pWork.nlen = 6;
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58 }
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59
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60 pWork.nlen -= 2;
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61
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62 r = pWork.buf | (w >> pWork.nlen);
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63
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64 pWork.buf = (w << (8 - pWork.nlen));
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65 return r;
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66 }
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67
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68
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69 //int decode(char *cont, char *file_name)
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70 int decode(char *cont, FILE *outfile)
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71 {
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72 int rw;
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73 tagTT work;
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74
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75 //ofstream outfile(file_name);
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76
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77 work.buf = 0;
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78 work.nlen = 0;
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79 work.cont = cont;
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80
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81 rw = GetNumB64(work);
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82 while ( rw != -1 )
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83 {
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84 //outfile << (char)rw;
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85 putc(rw, outfile);
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86 rw = GetNumB64(work);
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87 }
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88
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89 //outfile.close();
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90
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91 return 0;
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92 }
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