| 1 | /*
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| 2 | * Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #ifndef OSSL_INTERNAL_ENDIAN_H
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| 11 | # define OSSL_INTERNAL_ENDIAN_H
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| 12 | # ifndef RT_WITHOUT_PRAGMA_ONCE /* VBOX */
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| 13 | # pragma once
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| 14 | # endif /* VBOX */
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| 15 |
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| 16 | /*
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| 17 | * IS_LITTLE_ENDIAN and IS_BIG_ENDIAN can be used to detect the endiannes
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| 18 | * at compile time. To use it, DECLARE_IS_ENDIAN must be used to declare
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| 19 | * a variable.
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| 20 | *
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| 21 | * L_ENDIAN and B_ENDIAN can be used at preprocessor time. They can be set
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| 22 | * in the configarion using the lib_cppflags variable. If neither is
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| 23 | * set, it will fall back to code works with either endianness.
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| 24 | */
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| 25 |
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| 26 | # if defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__)
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| 27 | # define DECLARE_IS_ENDIAN const int ossl_is_little_endian = __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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| 28 | # define IS_LITTLE_ENDIAN (ossl_is_little_endian)
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| 29 | # define IS_BIG_ENDIAN (!ossl_is_little_endian)
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| 30 | # if defined(L_ENDIAN) && (__BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__)
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| 31 | # error "L_ENDIAN defined on a big endian machine"
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| 32 | # endif
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| 33 | # if defined(B_ENDIAN) && (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
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| 34 | # error "B_ENDIAN defined on a little endian machine"
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| 35 | # endif
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| 36 | # if !defined(L_ENDIAN) && (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
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| 37 | # define L_ENDIAN
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| 38 | # endif
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| 39 | # if !defined(B_ENDIAN) && (__BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__)
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| 40 | # define B_ENDIAN
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| 41 | # endif
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| 42 | # else
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| 43 | # define DECLARE_IS_ENDIAN \
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| 44 | const union { \
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| 45 | long one; \
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| 46 | char little; \
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| 47 | } ossl_is_endian = { 1 }
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| 48 |
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| 49 | # define IS_LITTLE_ENDIAN (ossl_is_endian.little != 0)
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| 50 | # define IS_BIG_ENDIAN (ossl_is_endian.little == 0)
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| 51 | # endif
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| 52 |
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| 53 | #endif
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