base64.c (1940B)
1 /* 2 * QEMU base64 helpers 3 * 4 * Copyright (c) 2015 Red Hat, Inc. 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * This library is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with this library; if not, see <http://www.gnu.org/licenses/>. 18 * 19 */ 20 21 #include "qemu/osdep.h" 22 #include "qapi/error.h" 23 #include "qemu/base64.h" 24 25 static const char *base64_valid_chars = 26 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\n"; 27 28 uint8_t *qbase64_decode(const char *input, 29 size_t in_len, 30 size_t *out_len, 31 Error **errp) 32 { 33 *out_len = 0; 34 35 if (in_len != -1) { 36 /* Lack of NUL terminator is an error */ 37 if (input[in_len] != '\0') { 38 error_setg(errp, "Base64 data is not NUL terminated"); 39 return NULL; 40 } 41 /* Check there's no NULs embedded since we expect 42 * this to be valid base64 data */ 43 if (memchr(input, '\0', in_len) != NULL) { 44 error_setg(errp, "Base64 data contains embedded NUL characters"); 45 return NULL; 46 } 47 48 /* Now we know its a valid nul terminated string 49 * strspn is safe to use... */ 50 } else { 51 in_len = strlen(input); 52 } 53 54 if (strspn(input, base64_valid_chars) != in_len) { 55 error_setg(errp, "Base64 data contains invalid characters"); 56 return NULL; 57 } 58 59 return g_base64_decode(input, out_len); 60 }