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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#if !defined (BVB_INSIDE_BVB_REFIMPL_H) && !defined (BVB_REFIMPL_COMPILATION)
#error "Never include this file directly, include bvb_refimpl.h instead."
#endif
#ifndef BVB_UTIL_H_
#define BVB_UTIL_H_
#include "bvb_boot_image_header.h"
#include "bvb_sysdeps.h"
#ifdef __cplusplus
extern "C" {
#endif
/* Converts a 32-bit unsigned integer from big-endian to host byte order. */
uint32_t bvb_be32toh(uint32_t in);
/* Converts a 64-bit unsigned integer from big-endian to host byte order. */
uint64_t bvb_be64toh(uint64_t in);
/* Adds |value_to_add| to |value| with overflow protection.
*
* Returns zero if the addition overflows, non-zero otherwise. In
* either case, |value| is always modified.
*/
int bvb_safe_add_to(uint64_t *value, uint64_t value_to_add);
/* Adds |a| and |b| with overflow protection, returning the value in
* |out_result|.
*
* It's permissible to pass NULL for |out_result| if you just want to
* check that the addition would not overflow.
*
* Returns zero if the addition overflows, non-zero otherwise.
*/
int bvb_safe_add(uint64_t *out_result, uint64_t a, uint64_t b);
/* Copies |src| to |dest|, byte-swapping fields in the process. */
void bvb_boot_image_header_to_host_byte_order(
const BvbBootImageHeader* src,
BvbBootImageHeader* dest);
/* Copies |header| to |dest|, byte-swapping fields in the process. */
void bvb_rsa_public_key_header_to_host_byte_order(
const BvbRSAPublicKeyHeader* src,
BvbRSAPublicKeyHeader* dest);
#ifdef __cplusplus
}
#endif
#endif /* BVB_UTIL_H_ */
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