[gthumb] PNG files not loaded from remote locations

[Paolo Bacchilega <paobac src gnome org>]

commit dfc346d34dc8f95b3258ac2c08221fe1e83b0452
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Sun Mar 1 20:48:35 2020 +0100

    PNG files not loaded from remote locations
    
    Make sure to read the requested amount of data.
    
    Fixes https://gitlab.gnome.org/GNOME/gthumb/issues/81

 extensions/cairo_io/cairo-image-surface-png.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)
---
diff --git a/extensions/cairo_io/cairo-image-surface-png.c b/extensions/cairo_io/cairo-image-surface-png.c
index 8017ef68..e0ba3c53 100644
--- a/extensions/cairo_io/cairo-image-surface-png.c
+++ b/extensions/cairo_io/cairo-image-surface-png.c
@@ -84,16 +84,16 @@ cairo_png_read_data_func (png_structp png_ptr,
                          png_size_t  size)
 {
        CairoPngData *cairo_png_data;
-       gssize        n;
        GError       *error = NULL;
 
        cairo_png_data = png_get_io_ptr (png_ptr);
-       n = g_input_stream_read (cairo_png_data->stream,
-                                buffer,
-                                size,
-                                cairo_png_data->cancellable,
-                                &error);
-       if (n < 0) {
+       if(! g_input_stream_read_all (cairo_png_data->stream,
+                                     buffer,
+                                     size,
+                                     NULL,
+                                     cairo_png_data->cancellable,
+                                     &error))
+       {
                png_error (png_ptr, error->message);
                g_error_free (error);
        }