imageio_dng: create little-endian files

src/imageio/imageio_dng.h

@@ -43,10 +43,10 @@
 static inline void _imageio_dng_write_buf(uint8_t *buf, const uint32_t d, const int val)
 {
   if(d + 4 >= HEADBUFFSIZE) return;
-  buf[d + 3] = val & 0xff;
-  buf[d + 2] = (val >> 8) & 0xff;
-  buf[d + 1] = (val >> 16) & 0xff;
-  buf[d] = val >> 24;
+  buf[d] = val & 0xff;
+  buf[d + 1] = (val >> 8) & 0xff;
+  buf[d + 2] = (val >> 16) & 0xff;
+  buf[d + 3] = val >> 24;
 }
 
 static inline int _imageio_dng_make_tag(
@@ -92,10 +92,10 @@ static inline void _imageio_dng_write_tiff_header(
 
   memset(buf, 0, sizeof(buf));
   /* TIFF file header.  */
-  buf[0] = 0x4d;
-  buf[1] = 0x4d;
-  buf[3] = 42;
-  buf[7] = 8;
+  buf[0] = 0x49;
+  buf[1] = 0x49;
+  buf[2] = 42;
+  buf[4] = 8;
   uint32_t b = 10;
 
   // If you want to add other tags written to a dng file include the the ID in the enum to