Update README.adoc

LF was converted to CR LF, systematically corrupting bitmap data.

README.adoc

@@ -1,7 +1,8 @@
 fiv
 ===
 
-'fiv' is a slightly unconventional, general-purpose image browser and viewer.
+'fiv' is a slightly unconventional, general-purpose image browser and viewer
+for Linux (that said, macOS and Windows ports are possible).
 
 image::docs/fiv.webp["Screenshot of both the browser and the viewer"]
 
@@ -23,7 +24,6 @@ Explicit non-goals
    nothing beyond the most basic of adjustments is desired.
  - Following the latest GNOME HIG to the letter--header bars are deliberately
    avoided, for their general user hostility.
- - Portability to non-UNIXy systems, although patches are welcome.
  - Memory efficiency is secondary to both performance and development effort.
 
 Aspirations

fiv.c

@@ -25,6 +25,11 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+#ifdef G_OS_WIN32
+#include <io.h>
+#include <fcntl.h>
+#endif  // G_OS_WIN32
+
 #include "config.h"
 
 #include "fiv-browser.h"
@@ -1807,6 +1812,10 @@ output_thumbnail(const char *path_arg, gboolean extract, const char *size_arg)
 			exit_fatal("unknown thumbnail size: %s", size_arg);
 	}
 
+#ifdef G_OS_WIN32
+	_setmode(fileno(stdout), _O_BINARY);
+#endif  // G_OS_WIN32
+
 	GError *error = NULL;
 	GFile *file = g_file_new_for_commandline_arg(path_arg);
 	cairo_surface_t *surface = NULL;