[libsoup] Handle sniffing bytes with 0 size

[Patrick Griffis <pgriffis src gnome org>]

commit b0fd7e1f65049b7efdf50febe6765039de4289ed
Author: Patrick Griffis <pgriffis igalia com>
Date:   Wed Dec 16 15:54:32 2020 -0600

    Handle sniffing bytes with 0 size

 libsoup/content-sniffer/soup-content-sniffer.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/libsoup/content-sniffer/soup-content-sniffer.c b/libsoup/content-sniffer/soup-content-sniffer.c
index cb4255ad..cf5da7e1 100644
--- a/libsoup/content-sniffer/soup-content-sniffer.c
+++ b/libsoup/content-sniffer/soup-content-sniffer.c
@@ -507,6 +507,9 @@ sniff_unknown (SoupContentSniffer *sniffer, GBytes *buffer,
        resource_length = MIN (512, resource_length);
        guint i;
 
+        if (resource_length == 0)
+                return g_strdup ("application/octet-stream");
+
        for (i = 0; i < G_N_ELEMENTS (types_table); i++) {
                SoupContentSnifferPattern *type_row = &(types_table[i]);