/*-
 * Copyright (c) 2017-2018, Juniper Networks, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#include <sys/cdefs.h>
#include <libsecureboot.h>

unsigned char *
read_fd(int fd, size_t len)
{
        int m, n, x;
        unsigned char *buf;

        buf = malloc(len + 1);
        if (buf != NULL) {
                for (x = 0, m = len; m > 0; ) {
                        n = read(fd, &buf[x], m);
                        if (n < 0)
                                break;
                        if (n > 0) {
                                m -= n;
                                x += n;
                        }
                }
                if (m == 0) {
                        buf[len] = '\0';
                        return (buf);
                }
                free(buf);
        }
        return (NULL);
}

unsigned char *
read_file(const char *path, size_t *len)
{
        struct stat st;
        unsigned char *ucp;
        int fd;

        if (len)
                *len = 0;
        if ((fd = open(path, O_RDONLY)) < 0)
                return (NULL);
        fstat(fd, &st);
        ucp = read_fd(fd, st.st_size);
        close(fd);
        if (ucp != NULL) {
                if (len != NULL)
                        *len = st.st_size;
        }
#ifdef _STANDALONE
        else
                printf("%s: out of memory! %lu\n", __func__,
                    (unsigned long)len);
#endif

        return (ucp);
}