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