Base64 Encode and Decode - VCL

Here is a way to Base64 Encode and Decode your string in Borland C++ Builder (VCL)...

PLAIN TEXT
C++:
1. // Base 64 encoder / decoder
2. #include <vcl.h>
3. #include <math.h>
4. //---------------------------------------------------------------------------
5.  
6. AnsiString Base64Encode(AnsiString slToEnc)
7. {
8.   //The Base64 Table
9.   const char Base64Table[64]=
10.     "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
11.   char * buftoenc = slToEnc.c_str();
12.   int bufsize = slToEnc.Length() + 1;
13.   char * encbuf = new char[slToEnc.Length() * 5];
14.   encbuf[0] = '\0';  int ilStrLen = -1;
15.   int i=0; int b64byte[5];
16.   unsigned char *buftemp;
17.   AnsiString slRetVal = EmptyStr;
18.  
19.  
20.   buftemp=(unsigned char *)malloc(bufsize+2);
21.   strcpy(buftemp,buftoenc);
22.   if (fmod(bufsize,3)==1)
23.   {
24.     buftemp[bufsize]='\0';
25.     buftemp[bufsize+1]='\0';
26.   }
27.   if (fmod(bufsize,3)==2)buftemp[bufsize]='\0';
28.   while (i<bufsize)
29.   {
30.     b64byte[0]=buftemp[i]>>2;
31.     b64byte[1]=((buftemp[i]&3)<<4)|(buftemp[i+1]>>4);
32.     b64byte[2]=((buftemp[i+1]&0x0F)<<2)|(buftemp[i+2]>>6);
33.     b64byte[3]=buftemp[i+2]&0x3F;
34.     encbuf[i+(i/3)]=Base64Table[b64byte[0]];
35.     encbuf[i+(i/3)+1]=Base64Table[b64byte[1]];
36.     encbuf[i+(i/3)+2]=Base64Table[b64byte[2]];
37.     encbuf[i+(i/3)+3]=Base64Table[b64byte[3]];
38.     i+=3;
39.   }
40.   free(buftemp);
41.  
42.  
43.   if (fmod(bufsize,3)==0) ilStrLen = bufsize*8/6;
44.   else if (fmod(bufsize,3)==1) ilStrLen = ((bufsize+2)*8/6)-2;
45.   else if (fmod(bufsize,3)==2) ilStrLen = ((bufsize+1)*8/6)-1;
46.   else ilStrLen = -1;
47.   if(ilStrLen> 0) slRetVal = AnsiString(encbuf).SubString(1, ilStrLen);
48.   if(encbuf != NULL) { delete encbuf; encbuf = NULL; }
49.  
50.   return slRetVal;
51. }
52.  
53.  
54. //-----------------------------------------------------------------------
55.  
56. AnsiString Base64Decode(AnsiString slToDec)
57. {
58.   //Base64 Table
59.   const char Base64Table[64]=
60.     "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
61.   char * buftodec = slToDec.c_str();
62.   int bufsize = slToDec.Length() + 1;
63.   char * decbuf = new char[slToDec.Length() * 5];
64.   decbuf[0] = '\0';  int ilStrLen = -1;
65.   AnsiString slRetVal = EmptyStr;
66.  
67.   int i=0; unsigned char binbyte[4];
68.   int cpos[5]; unsigned char *buftemp;
69.  
70.   buftemp=(unsigned char *)malloc(bufsize);
71.   strcpy(buftemp,buftodec);
72.   if (fmod(bufsize,4)==1)
73.   {
74.     buftemp[bufsize]='\0';
75.     buftemp[bufsize+1]='\0';
76.     buftemp[bufsize+2]='\0';
77.   }
78.   if (fmod(bufsize,4)==2)
79.   {
80.     buftemp[bufsize]='\0';
81.     buftemp[bufsize+1]='\0';
82.   }
83.   if (fmod(bufsize,4)==3)buftemp[bufsize]='\0';
84.   while (i<bufsize)
85.   {
86.     cpos[0]=strchr(Base64Table,buftemp[i])-Base64Table;
87.     cpos[1]=strchr(Base64Table,buftemp[i+1])-Base64Table;
88.     cpos[2]=strchr(Base64Table,buftemp[i+2])-Base64Table;
89.     cpos[3]=strchr(Base64Table,buftemp[i+3])-Base64Table;
90.     binbyte[0]=((cpos[0]<<2)|(cpos[1]>>4));
91.     binbyte[1]=((cpos[1]<<4)|(cpos[2]>>2));
92.     binbyte[2]=(((cpos[2]&0x03)<<6)|(cpos[3]&0x3f));
93.     decbuf[i-(i/4)]=binbyte[0];
94.     decbuf[i-(i/4)+1]=binbyte[1];
95.     decbuf[i-(i/4)+2]=binbyte[2];
96.     i+=4;
97.   }
98.   free(buftemp);
99.   if (fmod(bufsize,4)==0) ilStrLen = bufsize*6/8;
100.   else if (fmod(bufsize,4)==1) ilStrLen = ((bufsize+3)*6/8)-3;
101.   else if (fmod(bufsize,4)==2) ilStrLen = ((bufsize+2)*6/8)-2;
102.   else if (fmod(bufsize,4)==3) ilStrLen = ((bufsize+1)*6/8)-1;
103.   else ilStrLen = -1;
104.   if(ilStrLen> 0) slRetVal = AnsiString(decbuf).SubString(1, ilStrLen);
105.   if(decbuf != NULL) { delete decbuf; decbuf = NULL; }
106.   return slRetVal;
107. }

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Author: Raz | On June 30th, 2007 | C++ Builder, [ En ] | No Comments

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