[spice-gtk PATCH 6/9] usb-device-manager: use a function to get vid:pid from a libusb_device

[Uri Lublin <uril@xxxxxxxxxx>]

To be reused later.

Also implemented a get_device_descriptor function (in case it will be
needed in the future).
---
 gtk/usb-device-manager.c | 58 +++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 48 insertions(+), 10 deletions(-)

diff --git a/gtk/usb-device-manager.c b/gtk/usb-device-manager.c
index b4320af..0a561f1 100644
--- a/gtk/usb-device-manager.c
+++ b/gtk/usb-device-manager.c
@@ -607,6 +607,50 @@ static gboolean spice_usb_device_manager_get_udev_bus_n_address(
     return *bus && *address;
 }

+static gboolean spice_usb_device_manager_get_device_descriptor(
+    libusb_device *libdev,
+    struct libusb_device_descriptor *desc)
+{
+    int errcode;
+    const gchar *errstr;
+
+    g_return_val_if_fail(libdev != NULL, FALSE);
+    g_return_val_if_fail(desc   != NULL, FALSE);
+
+    errcode = libusb_get_device_descriptor(libdev, desc);
+    if (errcode < 0) {
+        int bus, addr;
+
+        bus = libusb_get_bus_number(libdev);
+        addr = libusb_get_device_address(libdev);
+        errstr = spice_usbutil_libusb_strerror(errcode);
+        g_warning("cannot get device descriptor for (%p) %d.%d -- %s(%d)",
+                  libdev, bus, addr, errstr, errcode);
+        return FALSE;
+    }
+    return TRUE;
+}
+
+static gboolean spice_usb_device_manager_get_libdev_vid_pid(
+    libusb_device *libdev, int *vid, int *pid)
+{
+    struct libusb_device_descriptor desc;
+
+    g_return_val_if_fail(libdev != NULL, FALSE);
+    g_return_val_if_fail(vid != NULL, FALSE);
+    g_return_val_if_fail(pid != NULL, FALSE);
+
+    *vid = *pid = 0;
+
+    if (!spice_usb_device_manager_get_device_descriptor(libdev, &desc)) {
+        return FALSE;
+    }
+    *vid = desc.idVendor;
+    *pid = desc.idProduct;
+
+    return TRUE;
+}
+
 /* ------------------------------------------------------------------ */
 /* callbacks                                                          */

@@ -1462,9 +1506,7 @@ gchar *spice_usb_device_get_description(SpiceUsbDevice *device, const gchar *for
 static SpiceUsbDeviceInfo *spice_usb_device_new(libusb_device *libdev)
 {
     SpiceUsbDeviceInfo *info;
-    struct libusb_device_descriptor desc;
-    int errcode;
-    const gchar *errstr;
+    int vid, pid;
     guint8 bus, addr;

     g_return_val_if_fail(libdev != NULL, NULL);
@@ -1472,11 +1514,7 @@ static SpiceUsbDeviceInfo *spice_usb_device_new(libusb_device *libdev)
     bus = libusb_get_bus_number(libdev);
     addr = libusb_get_device_address(libdev);

-    errcode = libusb_get_device_descriptor(libdev, &desc);
-    if (errcode < 0) {
-        errstr = spice_usbutil_libusb_strerror(errcode);
-        g_warning("cannot get device descriptor for (%p) %d.%d -- %s(%d)",
-                  libdev, bus, addr, errstr, errcode);
+    if (!spice_usb_device_manager_get_libdev_vid_pid(libdev, &vid, &pid)) {
         return NULL;
     }

@@ -1484,8 +1522,8 @@ static SpiceUsbDeviceInfo *spice_usb_device_new(libusb_device *libdev)

     info->busnum  = bus;
     info->devaddr = addr;
-    info->vid = desc.idVendor;
-    info->pid = desc.idProduct;
+    info->vid = vid;
+    info->pid = pid;
     info->ref = 1;

     return info;
-- 
1.8.1.4

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