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[apt.git] / apt-pkg / contrib / sha2_internal.cc

diff --git a/apt-pkg/contrib/sha2_internal.cc b/apt-pkg/contrib/sha2_internal.cc
index bb2560252708f1c8ed816b1c1f5f860dba91a27f..f70b7b17d49f514c7bf0e9dc3e444dd9095f9db6 100644 (file)
--- a/apt-pkg/contrib/sha2_internal.cc
+++ b/apt-pkg/contrib/sha2_internal.cc
@@ -33,6 +33,7 @@
  */
 #include <config.h>
 
+#include <endian.h>
 #include <string.h>    /* memcpy()/memset() or bcopy()/bzero() */
 #include <assert.h>    /* assert() */
 #include "sha2_internal.h"
@@ -128,6 +129,14 @@ typedef u_int64_t sha2_word64;     /* Exactly 8 bytes */
 
 /*** ENDIAN REVERSAL MACROS *******************************************/
 #if BYTE_ORDER == LITTLE_ENDIAN
+#if defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3))
+#define REVERSE32(w,x) { \
+       (x) = __builtin_bswap32(w); \
+}
+#define REVERSE64(w,x) { \
+       (x) = __builtin_bswap64(w); \
+}
+#else
 #define REVERSE32(w,x) { \
        sha2_word32 tmp = (w); \
        tmp = (tmp >> 16) | (tmp << 16); \
@@ -141,6 +150,7 @@ typedef u_int64_t sha2_word64;      /* Exactly 8 bytes */
        (x) = ((tmp & 0xffff0000ffff0000ULL) >> 16) | \
              ((tmp & 0x0000ffff0000ffffULL) << 16); \
 }
+#endif
 #endif /* BYTE_ORDER == LITTLE_ENDIAN */
 
 /*