darwin: work around devices with buggy endpoint descriptors

This commit adds a workaround for devices that have buggy endpoint
descriptors but are otherwise functional. These devices will have
endpoints that fail the GetPipeProperties call. Since we only care
about the endpoint address we can read it from the descriptor
itself.

Signed-off-by: Nathan Hjelm <hjelmn@me.com>

2 files changed, 25 insertions, 8 deletions

diff --git a/libusb/os/darwin_usb.c b/libusb/os/darwin_usb.c
index 7912282..ef163ff 100644
--- a/libusb/os/darwin_usb.c
+++ b/libusb/os/darwin_usb.c
@@ -1201,7 +1201,7 @@ static int get_endpoints (struct libusb_device_handle *dev_handle, int iface) {
   u_int8_t numep, direction, number;
   u_int8_t dont_care1, dont_care3;
   u_int16_t dont_care2;
-  int i;
+  int rc;
 
   usbi_dbg ("building table of endpoints.");
 
@@ -1213,19 +1213,36 @@ static int get_endpoints (struct libusb_device_handle *dev_handle, int iface) {
   }
 
   /* iterate through pipe references */
-  for (i = 1 ; i <= numep ; i++) {
+  for (int i = 1 ; i <= numep ; i++) {
     kresult = (*(cInterface->interface))->GetPipeProperties(cInterface->interface, i, &direction, &number, &dont_care1,
                                                             &dont_care2, &dont_care3);
 
     if (kresult != kIOReturnSuccess) {
-      usbi_err (HANDLE_CTX (dev_handle), "error getting pipe information for pipe %d: %s", i, darwin_error_str(kresult));
+      /* probably a buggy device. try to get the endpoint address from the descriptors */
+      struct libusb_config_descriptor *config;
+      const struct libusb_endpoint_descriptor *endpoint_desc;
+      UInt8 alt_setting;
 
-      return darwin_to_libusb (kresult);
-    }
+      kresult = (*(cInterface->interface))->GetAlternateSetting (cInterface->interface, &alt_setting);
+      if (kresult) {
+        usbi_err (HANDLE_CTX (dev_handle), "can't get alternate setting for interface");
+        return darwin_to_libusb (kresult);
+      }
+
+      rc = libusb_get_active_config_descriptor (dev_handle->dev, &config);
+      if (LIBUSB_SUCCESS != rc) {
+        return rc;
+      }
 
-    usbi_dbg ("interface: %i pipe %i: dir: %i number: %i", iface, i, direction, number);
+      endpoint_desc = config->interface[iface].altsetting[alt_setting].endpoint + i - 1;
+
+      cInterface->endpoint_addrs[i - 1] = endpoint_desc->bEndpointAddress;
+    } else {
+      cInterface->endpoint_addrs[i - 1] = (((kUSBIn == direction) << kUSBRqDirnShift) | (number & LIBUSB_ENDPOINT_ADDRESS_MASK));
+    }
 
-    cInterface->endpoint_addrs[i - 1] = (((kUSBIn == direction) << kUSBRqDirnShift) | (number & LIBUSB_ENDPOINT_ADDRESS_MASK));
+    usbi_dbg ("interface: %i pipe %i: dir: %i number: %i", iface, i, cInterface->endpoint_addrs[i - 1] >> kUSBRqDirnShift,
+              cInterface->endpoint_addrs[i - 1] & LIBUSB_ENDPOINT_ADDRESS_MASK);
   }
 
   cInterface->num_endpoints = numep;
diff --git a/libusb/version_nano.h b/libusb/version_nano.h
index 43ace0c..2074f55 100644
--- a/libusb/version_nano.h
+++ b/libusb/version_nano.h
@@ -1 +1 @@
-#define LIBUSB_NANO 11140
+#define LIBUSB_NANO 11141