# HG changeset patch
# User jbe
# Date 1502628950 -7200
# Node ID 01f53490f26228b2eaf55e0ba560a4bb6869a0fc
# Parent  5e6dbaa3e21995210d44d6f7fb24992fa8020232
moonhash library: determine endianess on FreeBSD, OpenBSD, NetBSD, and Linux

diff -r 5e6dbaa3e219 -r 01f53490f262 libraries/moonhash/moonhash_sha3.c
--- a/libraries/moonhash/moonhash_sha3.c	Sun Aug 13 14:31:21 2017 +0200
+++ b/libraries/moonhash/moonhash_sha3.c	Sun Aug 13 14:55:50 2017 +0200
@@ -2,6 +2,20 @@
 
 #include <stdint.h>
 
+#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__)
+#include <sys/endian.h>
+#if defined(_BYTE_ORDER) && defined(_LITTLE_ENDIAN) && _BYTE_ORDER == _LITTLE_ENDIAN
+#define MOONHASH_LITTLE_ENDIAN
+#endif
+#elif defined(__linux__)
+#include <endian.h>
+#if defined(__BYTE_ORDER) && defined(__LITTLE_ENDIAN) && __BYTE_ORDER == __LITTLE_ENDIAN
+#define MOONHASH_LITTLE_ENDIAN
+#endif
+#else
+#warning Could not determine endianess, revert to fail safe.
+#endif
+
 #define FOR(i,n) for(i=0; i<n; ++i)
 typedef uint8_t u8;
 typedef uint64_t u64;
@@ -17,9 +31,15 @@
 
 static int LFSR86540(u8 *R) { (*R)=((*R)<<1)^(((*R)&0x80)?0x71:0); return ((*R)&2)>>1; }
 #define ROL(a,o) ((((u64)a)<<o)^(((u64)a)>>(64-o)))
+#ifdef MOONHASH_LITTLE_ENDIAN
+#define load64(src) (*(uint64_t *)(src))
+#define store64(dst, src) do { *(uint64_t *)(dst) = src; } while (0)
+#define xor64(dst, src) do { *(uint64_t *)(dst) ^= src; } while (0)
+#else
 static u64 load64(const u8 *x) { ui i; u64 u=0; FOR(i,8) { u<<=8; u|=x[7-i]; } return u; }
 static void store64(u8 *x, u64 u) { ui i; FOR(i,8) { x[i]=u; u>>=8; } }
 static void xor64(u8 *x, u64 u) { ui i; FOR(i,8) { x[i]^=u; u>>=8; } }
+#endif
 #define rL(x,y) load64((u8*)s+8*(x+5*y))
 #define wL(x,y,l) store64((u8*)s+8*(x+5*y),l)
 #define XL(x,y,l) xor64((u8*)s+8*(x+5*y),l)