/* * 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 <config-host.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); }