Add and use internal header that implements endianness check

This moves test/ossl_test_endian.h to include/internal/endian.h and
thereby makes the macros in there our standard way to check endianness
in run-time.

Reviewed-by: Kurt Roeckx <kurt@roeckx.be>
(Merged from https://github.com/openssl/openssl/pull/12390)

1 files changed, 9 insertions, 20 deletions

diff --git a/providers/implementations/digests/blake2_impl.h b/providers/implementations/digests/blake2_impl.h
index 52477a8fe2..aa6d8a3075 100644
--- a/providers/implementations/digests/blake2_impl.h
+++ b/providers/implementations/digests/blake2_impl.h
@@ -15,15 +15,13 @@
  */
 
 #include <string.h>
+#include "internal/endian.h"
 
 static ossl_inline uint32_t load32(const uint8_t *src)
 {
-    const union {
-        long one;
-        char little;
-    } is_endian = { 1 };
+    DECLARE_IS_ENDIAN;
 
-    if (is_endian.little) {
+    if (IS_LITTLE_ENDIAN) {
         uint32_t w;
         memcpy(&w, src, sizeof(w));
         return w;
@@ -38,12 +36,9 @@ static ossl_inline uint32_t load32(const uint8_t *src)
 
 static ossl_inline uint64_t load64(const uint8_t *src)
 {
-    const union {
-        long one;
-        char little;
-    } is_endian = { 1 };
+    DECLARE_IS_ENDIAN;
 
-    if (is_endian.little) {
+    if (IS_LITTLE_ENDIAN) {
         uint64_t w;
         memcpy(&w, src, sizeof(w));
         return w;
@@ -62,12 +57,9 @@ static ossl_inline uint64_t load64(const uint8_t *src)
 
 static ossl_inline void store32(uint8_t *dst, uint32_t w)
 {
-    const union {
-        long one;
-        char little;
-    } is_endian = { 1 };
+    DECLARE_IS_ENDIAN;
 
-    if (is_endian.little) {
+    if (IS_LITTLE_ENDIAN) {
         memcpy(dst, &w, sizeof(w));
     } else {
         uint8_t *p = (uint8_t *)dst;
@@ -80,12 +72,9 @@ static ossl_inline void store32(uint8_t *dst, uint32_t w)
 
 static ossl_inline void store64(uint8_t *dst, uint64_t w)
 {
-    const union {
-        long one;
-        char little;
-    } is_endian = { 1 };
+    DECLARE_IS_ENDIAN;
 
-    if (is_endian.little) {
+    if (IS_LITTLE_ENDIAN) {
         memcpy(dst, &w, sizeof(w));
     } else {
         uint8_t *p = (uint8_t *)dst;