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comparison old/simple_pack/base64_de.cpp @ 507:735f76483bb2

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Reorganization..
author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Mon, 12 Oct 2009 09:39:35 +0900
parents TaskManager/Test/simple_pack/base64_de.cpp@0c8ae614d421
children
comparison
equal deleted inserted replaced
506:1d4a8a86f26b 507:735f76483bb2
1 #include <iostream>
2 #include <fstream>
3 using namespace std;
4
5 class tagTT
6 {
7 public:
8 unsigned char buf;
9 char *cont;
10 int nlen;
11 };
12
13
14 unsigned char CtoNum(int c)
15 {
16 if (c >= 'A' && c <= 'Z') return c-'A';
17 if (c >= 'a' && c <= 'z') return (c - 'a')+26;
18 if (c >= '0' && c <= '9') return (c - '0')+52;
19 if (c == '+') return 62;
20 if (c == '/') return 63;
21 return 0;
22 }
23
24
25 int GetNumB64(tagTT &pWork)
26 {
27 char wr;
28 unsigned char w;
29 unsigned char r;
30
31 wr = *pWork.cont;
32 pWork.cont++;
33 if (wr=='\0' || wr=='=')
34 return -1;
35
36 while(wr=='\n' || wr=='\t')
37 {
38 wr = *pWork.cont;
39 pWork.cont++;
40 }
41
42 w = CtoNum(wr);
43 if (pWork.nlen == 0)
44 {
45 unsigned char w2;
46
47 wr = *pWork.cont;
48 pWork.cont++;
49 if (wr!='\0' && wr!='=')
50 w2 = CtoNum(wr);
51 else
52 w2 = 0;
53
54 pWork.buf = w << 2;
55 w = w2;
56 pWork.nlen = 6;
57 }
58
59 pWork.nlen -= 2;
60
61 r = pWork.buf | (w >> pWork.nlen);
62
63 pWork.buf = (w << (8 - pWork.nlen));
64 return r;
65 }
66
67
68 //int decode(char *cont, char *file_name)
69 int decode(char *cont, FILE *outfile)
70 {
71 int rw;
72 tagTT work;
73
74 //ofstream outfile(file_name);
75
76 work.buf = 0;
77 work.nlen = 0;
78 work.cont = cont;
79
80 rw = GetNumB64(work);
81 while ( rw != -1 )
82 {
83 //outfile << (char)rw;
84 putc(rw, outfile);
85 rw = GetNumB64(work);
86 }
87
88 //outfile.close();
89
90 return 0;
91 }