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/****************************************************************************
* Function to encode in Base64
*
* Written by Lauri Alanko
*
*****************************************************************************/
#include "common.h"
#include "base64.h"
char *
base64 (const char *bin, size_t len)
{
char *buf = (char *) malloc ((len + 2) / 3 * 4 + 1);
size_t i = 0, j = 0;
char BASE64_END = '=';
char base64_table[64];
strncpy (base64_table, "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/", 64);
while (j < len - 2) {
buf[i++] = base64_table[bin[j] >> 2];
buf[i++] = base64_table[((bin[j] & 3) << 4) | (bin[j + 1] >> 4)];
buf[i++] = base64_table[((bin[j + 1] & 15) << 2) | (bin[j + 2] >> 6)];
buf[i++] = base64_table[bin[j + 2] & 63];
j += 3;
}
switch (len - j) {
case 1:
buf[i++] = base64_table[bin[j] >> 2];
buf[i++] = base64_table[(bin[j] & 3) << 4];
buf[i++] = BASE64_END;
buf[i++] = BASE64_END;
break;
case 2:
buf[i++] = base64_table[bin[j] >> 2];
buf[i++] = base64_table[((bin[j] & 3) << 4) | (bin[j + 1] >> 4)];
buf[i++] = base64_table[(bin[j + 1] & 15) << 2];
buf[i++] = BASE64_END;
break;
case 0:
break;
}
buf[i] = '\0';
return buf;
}
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