char* base64_encode(char *dst, const char *src, unsigned int len)
{
char base64_table[] = {"ABCDEFGHIJKLMNOPQRSTUVWXYZ""abcdefghijklmnopqrstuvwxyz""0123456789+/"};
int x, y = 0, i, flag=0, m=0;
int n = 3;
char triple[3], quad[4], c;
static char encode[1024]={0};
for(x = 0; x < len; x = x + 3)
{
if((len - x) / 3 == 0) n = (len - x) % 3;
for(i=0; i < 3; i++) triple[i] = '0';
for(i=0; i < n; i++) triple[i] = src[x + i];
quad[0] = base64_table[(triple[0] & 0xFC) >> 2]; // FC = 11111100
quad[1] = base64_table[((triple[0] & 0x03) << 4) | ((triple[1] & 0xF0) >> 4)]; // 03 = 11
quad[2] = base64_table[((triple[1] & 0x0F) << 2) | ((triple[2] & 0xC0) >> 6)]; // 0F = 1111, C0=11110
quad[3] = base64_table[triple[2] & 0x3F]; // 3F = 111111
if(n < 3) quad[3] = '=';
if(n < 2) quad[2] = '=';
for(i=0; i < 4; i++) dst[y + i] = quad[i];
y = y + 4;
m = m + 4;
if((m != 0)&&((m % 76) == 0))
{
dst[y] = '\r';
dst[y+1] = '\n';
flag++;
y += 2;
m = 0;
}
}
dst[y] = '\0';
sprintf(encode,dst);
return encode;
}
not my code but it works well
