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#include "base64.h"
char Base64::CharBase64[] =
{
'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P',
'Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f',
'g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v',
'w','x','y','z','0','1','2','3','4','5','6','7','8','9','+','/'
};
ULONG Base64::Encode(const char *inputString, char *outputBuffer, SIZE_T nMaxLength)
{
int outpos = 0;
char chr[3], enc[4];
for (unsigned int i = 0; i < ::strlen(inputString); i += 3)
{
if (outpos + 4 >= (int)nMaxLength)
break;
chr[0] = inputString[i];
chr[1] = inputString[i+1];
chr[2] = inputString[i+2];
enc[0] = chr[0] >> 2;
enc[1] = ((chr[0] & 0x03) << 4) | (chr[1] >> 4);
enc[2] = ((chr[1] & 0x0F) << 2) | (chr[2] >> 6);
enc[3] = chr[2] & 0x3F;
outputBuffer[outpos++] = Base64::CharBase64[enc[0]];
outputBuffer[outpos++] = Base64::CharBase64[enc[1]];
if (i + 1 >= ::strlen(inputString))
{
outputBuffer[outpos++] = '=';
outputBuffer[outpos++] = '=';
}
else if (i + 2 >= ::strlen(inputString))
{
outputBuffer[outpos++] = Base64::CharBase64[enc[2]];
outputBuffer[outpos++] = '=';
}
else
{
outputBuffer[outpos++] = Base64::CharBase64[enc[2]];
outputBuffer[outpos++] = Base64::CharBase64[enc[3]];
}
}
outputBuffer[outpos] = 0;
return outpos;
}
int Base64::IndexBase64[] =
{
-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, -1,-1,-1,63,
52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1,-1,-1,-1,
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11,12,13,14,
15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1,
-1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40,
41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1,
-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1
};
ULONG Base64::Decode(const char *inputString, char *outputBuffer, SIZE_T nMaxLength)
{
int outpos = 0;
char chr[3], enc[4];
for (int i = 0; i < (int)::strlen(inputString); i += 4)
{
if (outpos+3 >= (int)nMaxLength) break;
enc[0] = Base64::IndexBase64[inputString[i]];
enc[1] = Base64::IndexBase64[inputString[i+1]];
enc[2] = Base64::IndexBase64[inputString[i+2]];
enc[3] = Base64::IndexBase64[inputString[i+3]];
if (enc[0] == -1 || enc[1] == -1) break;
chr[0] = (enc[0] << 2) | (enc[1] >> 4);
chr[1] = ((enc[1] & 15) << 4) | (enc[2] >> 2);
chr[2] = ((enc[2] & 3) << 6) | enc[3];
outputBuffer[outpos++] = chr[0];
if (enc[2] != -1) outputBuffer[outpos++] = chr[1];
if (enc[3] != -1) outputBuffer[outpos++] = chr[2];
}
outputBuffer[outpos] = 0;
return outpos;
}
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