From 89518c4f013c75721197791aac4e7ead528cb8bb Mon Sep 17 00:00:00 2001
From: gitlost <burmartke@gmail.com>
Date: Tue, 23 Mar 2021 15:37:18 +0000
Subject: [PATCH] tif.c: fix endianness detection, props Schaich Alonso

---
 backend/tif.c | 21 +++++++++------------
 1 file changed, 9 insertions(+), 12 deletions(-)

diff --git a/backend/tif.c b/backend/tif.c
index f0000efb..a950e122 100644
--- a/backend/tif.c
+++ b/backend/tif.c
@@ -45,13 +45,6 @@
 #include <malloc.h>
 #endif
 
-#if !defined(_WIN32) && !defined(__APPLE__)
-#include <endian.h>
-# if __BYTE_ORDER == __BIG_ENDIAN
-#define TIF_BIG_ENDIAN
-#endif
-#endif
-
 /* PhotometricInterpretation */
 #define TIF_PMI_WHITEISZERO     0
 #define TIF_PMI_BLACKISZERO     1
@@ -85,6 +78,10 @@ static void to_cmyk(unsigned char rgb[3], unsigned char alpha, unsigned char *cm
 
 }
 
+static int is_big_endian() {
+    return (*((const uint16_t *)"\x11\x22") == 0x1122);
+}
+
 INTERNAL int tif_pixel_plot(struct zint_symbol *symbol, unsigned char *pixelbuf) {
     unsigned char fg[4], bg[4];
     int i;
@@ -351,11 +348,11 @@ INTERNAL int tif_pixel_plot(struct zint_symbol *symbol, unsigned char *pixelbuf)
     }
 
     /* Header */
-#ifdef TIF_BIG_ENDIAN
-    header.byte_order = 0x4D4D; // "MM" big-endian
-#else
-    header.byte_order = 0x4949; // "II" little-endian
-#endif
+    if (is_big_endian()) {
+        header.byte_order = 0x4D4D; // "MM" big-endian
+    } else {
+        header.byte_order = 0x4949; // "II" little-endian
+    }
     header.identity = 42;
     header.offset = free_memory;