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/* $Id: base64.c,v 1.9 2017/01/24 13:32:55 jsing Exp $ */
/*
* Copyright (c) 2016 Kristaps Dzonsons <kristaps@bsd.lv>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <netinet/in.h>
#include <resolv.h>
#include <stdlib.h>
#include "extern.h"
/*
* Compute the maximum buffer required for a base64 encoded string of
* length "len".
*/
size_t
base64len(size_t len)
{
return (len + 2) / 3 * 4 + 1;
}
/*
* Pass a stream of bytes to be base64 encoded, then converted into
* base64url format.
* Returns NULL on allocation failure (not logged).
*/
char *
base64buf_url(const char *data, size_t len)
{
size_t i, sz;
char *buf;
sz = base64len(len);
if ((buf = malloc(sz)) == NULL)
return NULL;
b64_ntop(data, len, buf, sz);
for (i = 0; i < sz; i++)
switch (buf[i]) {
case '+':
buf[i] = '-';
break;
case '/':
buf[i] = '_';
break;
case '=':
buf[i] = '\0';
break;
}
return buf;
}
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