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/*
* QEMU base64 helpers
*
* Copyright (c) 2015 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu/base64.h"
static const char *base64_valid_chars =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\n";
uint8_t *qbase64_decode(const char *input,
size_t in_len,
size_t *out_len,
Error **errp)
{
*out_len = 0;
if (in_len != -1) {
/* Lack of NUL terminator is an error */
if (input[in_len] != '\0') {
error_setg(errp, "Base64 data is not NUL terminated");
return NULL;
}
/* Check there's no NULs embedded since we expect
* this to be valid base64 data */
if (memchr(input, '\0', in_len) != NULL) {
error_setg(errp, "Base64 data contains embedded NUL characters");
return NULL;
}
/* Now we know its a valid nul terminated string
* strspn is safe to use... */
} else {
in_len = strlen(input);
}
if (strspn(input, base64_valid_chars) != in_len) {
error_setg(errp, "Base64 data contains invalid characters");
return NULL;
}
return g_base64_decode(input, out_len);
}
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