Windows: Enable dynamic selection between WinUSB and UsbDk backends

This commit unifies the two Windows backends into a single project and
enables the user to switch to the UsbDk backend, if available, using the
libusb_set_option() function. All contexts will use the WinUSB backend
by default for backwards compatibility.

With this change, the UsbDk-specific projects are no longer required.

Closes #309

Signed-off-by: Chris Dickens <christopher.a.dickens@gmail.com>

1 files changed, 5 insertions, 42 deletions

diff --git a/libusb/os/windows_usbdk.h b/libusb/os/windows_usbdk.h
index e6eca8b..0de2675 100644
--- a/libusb/os/windows_usbdk.h
+++ b/libusb/os/windows_usbdk.h
@@ -23,56 +23,19 @@
 
 #pragma once
 
-typedef struct tag_USB_DK_DEVICE_ID {
-	WCHAR DeviceID[MAX_DEVICE_ID_LEN];
-	WCHAR InstanceID[MAX_DEVICE_ID_LEN];
-} USB_DK_DEVICE_ID, *PUSB_DK_DEVICE_ID;
+#include "windows_nt_common.h"
 
-static inline void UsbDkFillIDStruct(USB_DK_DEVICE_ID *ID, PCWCHAR DeviceID, PCWCHAR InstanceID)
+static inline void UsbDkFillIDStruct(USB_DK_DEVICE_ID *ID, const WCHAR *DeviceID, const WCHAR *InstanceID)
 {
-	wcsncpy_s(ID->DeviceID, DeviceID, MAX_DEVICE_ID_LEN);
-	wcsncpy_s(ID->InstanceID, InstanceID, MAX_DEVICE_ID_LEN);
+	wcsncpy(ID->DeviceID, DeviceID, MAX_DEVICE_ID_LEN);
+	wcsncpy(ID->InstanceID, InstanceID, MAX_DEVICE_ID_LEN);
 }
 
-typedef struct tag_USB_DK_DEVICE_INFO {
-	USB_DK_DEVICE_ID ID;
-	ULONG64 FilterID;
-	ULONG64 Port;
-	ULONG64 Speed;
-	USB_DEVICE_DESCRIPTOR DeviceDescriptor;
-} USB_DK_DEVICE_INFO, *PUSB_DK_DEVICE_INFO;
-
-typedef struct tag_USB_DK_CONFIG_DESCRIPTOR_REQUEST {
+typedef struct USB_DK_CONFIG_DESCRIPTOR_REQUEST {
 	USB_DK_DEVICE_ID ID;
 	ULONG64 Index;
 } USB_DK_CONFIG_DESCRIPTOR_REQUEST, *PUSB_DK_CONFIG_DESCRIPTOR_REQUEST;
 
-typedef struct tag_USB_DK_ISO_TRANSFER_RESULT {
-	ULONG64 ActualLength;
-	ULONG64 TransferResult;
-} USB_DK_ISO_TRANSFER_RESULT, *PUSB_DK_ISO_TRANSFER_RESULT;
-
-typedef struct tag_USB_DK_GEN_TRANSFER_RESULT {
-	ULONG64 BytesTransferred;
-	ULONG64 UsbdStatus; // USBD_STATUS code
-} USB_DK_GEN_TRANSFER_RESULT, *PUSB_DK_GEN_TRANSFER_RESULT;
-
-typedef struct tag_USB_DK_TRANSFER_RESULT {
-	USB_DK_GEN_TRANSFER_RESULT GenResult;
-	PVOID64 IsochronousResultsArray; // array of USB_DK_ISO_TRANSFER_RESULT
-} USB_DK_TRANSFER_RESULT, *PUSB_DK_TRANSFER_RESULT;
-
-typedef struct tag_USB_DK_TRANSFER_REQUEST {
-	ULONG64 EndpointAddress;
-	PVOID64 Buffer;
-	ULONG64 BufferLength;
-	ULONG64 TransferType;
-	ULONG64 IsochronousPacketsArraySize;
-	PVOID64 IsochronousPacketsArray;
-
-	USB_DK_TRANSFER_RESULT Result;
-} USB_DK_TRANSFER_REQUEST, *PUSB_DK_TRANSFER_REQUEST;
-
 typedef enum {
 	TransferFailure = 0,
 	TransferSuccess,