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Add byte order detection macro

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman 2022-11-28 14:47:46 +00:00
parent a360e1987a
commit e5c42594e5
1 changed files with 7 additions and 0 deletions
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7
library/alignment.h
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@ -120,6 +120,13 @@ inline void mbedtls_put_unaligned_uint64( void *p, uint64_t x )
#define MBEDTLS_BYTE_6( x ) ( (uint8_t) ( ( ( x ) >> 48 ) & 0xff ) )
#define MBEDTLS_BYTE_7( x ) ( (uint8_t) ( ( ( x ) >> 56 ) & 0xff ) )
#if !defined(__BYTE_ORDER__)
static const uint16_t mbedtls_byte_order_detector = { 0x100 };
#define MBEDTLS_IS_BIG_ENDIAN (*((unsigned char *) (&mbedtls_byte_order_detector)) == 0x01)
#else
#define MBEDTLS_IS_BIG_ENDIAN ((__BYTE_ORDER__) == (__ORDER_BIG_ENDIAN__))
#endif /* !defined(__BYTE_ORDER__) */
/**
* Get the unsigned 32 bits integer corresponding to four bytes in
* big-endian order (MSB first).