[librsvg: 2/3] (#676): rsvg-convert - use gio's stdin/stdout streams for win32.

[Federico Mena Quintero <federico src gnome org>]

commit 075a026c8837f37bbb36584c1cb9b7d92f4cb2a0
Author: Federico Mena Quintero <federico gnome org>
Date:   Tue Mar 23 17:03:25 2021 -0600

    (#676): rsvg-convert - use gio's stdin/stdout streams for win32.
    
    https://gitlab.gnome.org/GNOME/librsvg/-/issues/676

 src/bin/rsvg-convert.rs | 46 ++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 42 insertions(+), 4 deletions(-)
---
diff --git a/src/bin/rsvg-convert.rs b/src/bin/rsvg-convert.rs
index 4fcf30c6..a8479fd4 100644
--- a/src/bin/rsvg-convert.rs
+++ b/src/bin/rsvg-convert.rs
@@ -2,10 +2,20 @@
 extern crate clap;
 
 use gio::prelude::*;
-use gio::{
-    Cancellable, FileCreateFlags, FileExt, InputStream, OutputStream, UnixInputStream,
-    UnixOutputStream,
-};
+use gio::{Cancellable, FileCreateFlags, FileExt, InputStream, OutputStream};
+
+#[cfg(unix)]
+use gio::{UnixInputStream, UnixOutputStream};
+
+#[cfg(windows)]
+use std::io;
+
+#[cfg(windows)]
+use std::os::windows::io::AsRawHandle;
+
+#[cfg(windows)]
+use gio_sys;
+
 use librsvg::rsvg_convert_only::{LegacySize, PathOrUrl};
 use librsvg::{CairoRenderer, Color, Loader, Parse, RenderingError};
 use once_cell::unsync::OnceCell;
@@ -326,19 +336,47 @@ mod metadata {
 struct Stdin;
 
 impl Stdin {
+    #[cfg(unix)]
     pub fn stream() -> InputStream {
         let stream = unsafe { UnixInputStream::new(0) };
         stream.upcast::<InputStream>()
     }
+
+    #[cfg(windows)]
+    pub fn stream() -> InputStream {
+        // https://github.com/gtk-rs/gtk-rs/issues/381 - do this with
+        // Win32InputStream::with_handle when this is fixed
+        let raw_handle = io::stdin().as_raw_handle();
+        unsafe {
+            InputStream::from_glib_full(gio_sys::g_win32_input_stream_new(
+                raw_handle,
+                false.to_glib(),
+            ))
+        }
+    }
 }
 
 struct Stdout;
 
 impl Stdout {
+    #[cfg(unix)]
     pub fn stream() -> OutputStream {
         let stream = unsafe { UnixOutputStream::new(1) };
         stream.upcast::<OutputStream>()
     }
+
+    #[cfg(windows)]
+    pub fn stream() -> OutputStream {
+        // https://github.com/gtk-rs/gtk-rs/issues/381 - do this with
+        // Win32OutputStream::with_handle when this is fixed
+        let raw_handle = io::stdout().as_raw_handle();
+        unsafe {
+            OutputStream::from_glib_full(gio_sys::g_win32_output_stream_new(
+                raw_handle,
+                false.to_glib(),
+            ))
+        }
+    }
 }
 
 #[derive(Clone, Debug)]