mirror of https://github.com/waku-org/nwaku.git
59 lines
1.0 KiB
C
59 lines
1.0 KiB
C
|
|
#include "base64.h"
|
|
|
|
// Base64 encoding
|
|
// source: https://nachtimwald.com/2017/11/18/base64-encode-and-decode-in-c/
|
|
size_t b64_encoded_size(size_t inlen)
|
|
{
|
|
size_t ret;
|
|
|
|
ret = inlen;
|
|
if (inlen % 3 != 0)
|
|
ret += 3 - (inlen % 3);
|
|
ret /= 3;
|
|
ret *= 4;
|
|
|
|
return ret;
|
|
}
|
|
|
|
const char b64chars[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
|
|
|
|
char *b64_encode(const unsigned char *in, size_t len)
|
|
{
|
|
char *out;
|
|
size_t elen;
|
|
size_t i;
|
|
size_t j;
|
|
size_t v;
|
|
|
|
if (in == NULL || len == 0)
|
|
return NULL;
|
|
|
|
elen = b64_encoded_size(len);
|
|
out = malloc(elen+1);
|
|
out[elen] = '\0';
|
|
|
|
for (i=0, j=0; i<len; i+=3, j+=4) {
|
|
v = in[i];
|
|
v = i+1 < len ? v << 8 | in[i+1] : v << 8;
|
|
v = i+2 < len ? v << 8 | in[i+2] : v << 8;
|
|
|
|
out[j] = b64chars[(v >> 18) & 0x3F];
|
|
out[j+1] = b64chars[(v >> 12) & 0x3F];
|
|
if (i+1 < len) {
|
|
out[j+2] = b64chars[(v >> 6) & 0x3F];
|
|
} else {
|
|
out[j+2] = '=';
|
|
}
|
|
if (i+2 < len) {
|
|
out[j+3] = b64chars[v & 0x3F];
|
|
} else {
|
|
out[j+3] = '=';
|
|
}
|
|
}
|
|
|
|
return out;
|
|
}
|
|
|
|
// End of Base64 encoding
|