/*
 * Windows backend common header for libusb 1.0
 *
 * This file brings together header code common between
 * the desktop Windows backends.
 * Copyright © 2012-2013 RealVNC Ltd.
 * Copyright © 2009-2012 Pete Batard <pete@akeo.ie>
 * Copyright © 2014-2020 Chris Dickens <christopher.a.dickens@gmail.com>
 * With contributions from Michael Plante, Orin Eman et al.
 * Parts of this code adapted from libusb-win32-v1 by Stephan Meyer
 * Major code testing contribution by Xiaofan Chen
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef LIBUSB_WINDOWS_COMMON_H
#define LIBUSB_WINDOWS_COMMON_H

#include <stdbool.h>

/*
 * Workaround for the mess that exists with the DWORD and ULONG types.
 * Visual Studio unconditionally defines these types as 'unsigned long'
 * and a long is always 32-bits, even on 64-bit builds. GCC on the other
 * hand varies the width of a long, matching it to the build. To make
 * matters worse, the platform headers for these GCC builds define a
 * DWORD/ULONG to be 'unsigned long' on 32-bit builds and 'unsigned int'
 * on 64-bit builds. This creates a great deal of warnings for compilers
 * that support printf format checking since it will never actually be
 * an unsigned long.
 */
#if defined(_MSC_VER)
#define ULONG_CAST(x)	(x)
#else
#define ULONG_CAST(x)	((unsigned long)(x))
#endif

#if defined(__CYGWIN__)
#define _stricmp strcasecmp
#define _strdup strdup
// _beginthreadex is MSVCRT => unavailable for cygwin. Fallback to using CreateThread
#define _beginthreadex(a, b, c, d, e, f) CreateThread(a, b, (LPTHREAD_START_ROUTINE)c, d, e, (LPDWORD)f)
#else
#include <process.h>
#endif

#define safe_free(p) do {if (p != NULL) {free((void *)p); p = NULL;}} while (0)

/*
 * API macros - leveraged from libusb-win32 1.x
 */
#define DLL_STRINGIFY(s) #s

/*
 * Macros for handling DLL themselves
 */
#define DLL_HANDLE_NAME(name) __dll_##name##_handle

#define DLL_DECLARE_HANDLE(name)					\
	static HMODULE DLL_HANDLE_NAME(name)

#define DLL_GET_HANDLE(ctx, name)					\
	do {								\
		DLL_HANDLE_NAME(name) = load_system_library(ctx,	\
				DLL_STRINGIFY(name));			\
		if (!DLL_HANDLE_NAME(name))				\
			return false;					\
	} while (0)

#define DLL_FREE_HANDLE(name)						\
	do {								\
		if (DLL_HANDLE_NAME(name)) {				\
			FreeLibrary(DLL_HANDLE_NAME(name));		\
			DLL_HANDLE_NAME(name) = NULL;			\
		}							\
	} while (0)

/*
 * Macros for handling functions within a DLL
 */
#define DLL_FUNC_NAME(name) __dll_##name##_func_t

#define DLL_DECLARE_FUNC_PREFIXNAME(api, ret, prefixname, name, args)	\
	typedef ret (api * DLL_FUNC_NAME(name))args;			\
	static DLL_FUNC_NAME(name) prefixname

#define DLL_DECLARE_FUNC(api, ret, name, args)				\
	DLL_DECLARE_FUNC_PREFIXNAME(api, ret, name, name, args)
#define DLL_DECLARE_FUNC_PREFIXED(api, ret, prefix, name, args)		\
	DLL_DECLARE_FUNC_PREFIXNAME(api, ret, prefix##name, name, args)

#define DLL_LOAD_FUNC_PREFIXNAME(dll, prefixname, name, ret_on_failure)	\
	do {								\
		HMODULE h = DLL_HANDLE_NAME(dll);			\
		prefixname = (DLL_FUNC_NAME(name))GetProcAddress(h,	\
				DLL_STRINGIFY(name));			\
		if (prefixname)						\
			break;						\
		prefixname = (DLL_FUNC_NAME(name))GetProcAddress(h,	\
				DLL_STRINGIFY(name) DLL_STRINGIFY(A));	\
		if (prefixname)						\
			break;						\
		prefixname = (DLL_FUNC_NAME(name))GetProcAddress(h,	\
				DLL_STRINGIFY(name) DLL_STRINGIFY(W));	\
		if (prefixname)						\
			break;						\
		if (ret_on_failure)					\
			return false;					\
	} while (0)

#define DLL_LOAD_FUNC(dll, name, ret_on_failure)			\
	DLL_LOAD_FUNC_PREFIXNAME(dll, name, name, ret_on_failure)
#define DLL_LOAD_FUNC_PREFIXED(dll, prefix, name, ret_on_failure)	\
	DLL_LOAD_FUNC_PREFIXNAME(dll, prefix##name, name, ret_on_failure)

// https://msdn.microsoft.com/en-us/library/windows/hardware/ff539136(v=vs.85).aspx
#if !defined(USBD_SUCCESS)
typedef LONG USBD_STATUS;

#define USBD_SUCCESS(Status)		((USBD_STATUS)(Status) >= 0)

#define USBD_STATUS_ENDPOINT_HALTED	((USBD_STATUS)0xC0000030L)
#define USBD_STATUS_TIMEOUT		((USBD_STATUS)0xC0006000L)
#define USBD_STATUS_DEVICE_GONE		((USBD_STATUS)0xC0007000L)
#define USBD_STATUS_CANCELED		((USBD_STATUS)0xC0010000L)
#endif

// error code added with Windows SDK 10.0.18362
#ifndef ERROR_NO_SUCH_DEVICE
#define ERROR_NO_SUCH_DEVICE	433L
#endif

/* Windows versions */
enum windows_version {
	WINDOWS_UNDEFINED,
	WINDOWS_2000,
	WINDOWS_XP,
	WINDOWS_2003,	// Also XP x64
	WINDOWS_VISTA,
	WINDOWS_7,
	WINDOWS_8,
	WINDOWS_8_1,
	WINDOWS_10,
	WINDOWS_11_OR_LATER
};

extern enum windows_version windows_version;

#include <pshpack1.h>

typedef struct USB_DEVICE_DESCRIPTOR {
	UCHAR  bLength;
	UCHAR  bDescriptorType;
	USHORT bcdUSB;
	UCHAR  bDeviceClass;
	UCHAR  bDeviceSubClass;
	UCHAR  bDeviceProtocol;
	UCHAR  bMaxPacketSize0;
	USHORT idVendor;
	USHORT idProduct;
	USHORT bcdDevice;
	UCHAR  iManufacturer;
	UCHAR  iProduct;
	UCHAR  iSerialNumber;
	UCHAR  bNumConfigurations;
} USB_DEVICE_DESCRIPTOR, *PUSB_DEVICE_DESCRIPTOR;

typedef struct USB_CONFIGURATION_DESCRIPTOR {
	UCHAR  bLength;
	UCHAR  bDescriptorType;
	USHORT wTotalLength;
	UCHAR  bNumInterfaces;
	UCHAR  bConfigurationValue;
	UCHAR  iConfiguration;
	UCHAR  bmAttributes;
	UCHAR  MaxPower;
} USB_CONFIGURATION_DESCRIPTOR, *PUSB_CONFIGURATION_DESCRIPTOR;

#include <poppack.h>

#define MAX_DEVICE_ID_LEN	200

typedef struct USB_DK_DEVICE_ID {
	WCHAR DeviceID[MAX_DEVICE_ID_LEN];
	WCHAR InstanceID[MAX_DEVICE_ID_LEN];
} USB_DK_DEVICE_ID, *PUSB_DK_DEVICE_ID;

typedef struct 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 USB_DK_ISO_TRANSFER_RESULT {
	ULONG64 ActualLength;
	ULONG64 TransferResult;
} USB_DK_ISO_TRANSFER_RESULT, *PUSB_DK_ISO_TRANSFER_RESULT;

typedef struct USB_DK_GEN_TRANSFER_RESULT {
	ULONG64 BytesTransferred;
	ULONG64 UsbdStatus; // USBD_STATUS code
} USB_DK_GEN_TRANSFER_RESULT, *PUSB_DK_GEN_TRANSFER_RESULT;

typedef struct 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 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;

struct usbdk_device_priv {
	USB_DK_DEVICE_ID ID;
	PUSB_CONFIGURATION_DESCRIPTOR *config_descriptors;
	HANDLE redirector_handle;
	HANDLE system_handle;
	uint8_t active_configuration;
};

struct winusb_device_priv {
	bool initialized;
	bool root_hub;
	uint8_t active_config;
	uint8_t depth; // distance to HCD
	const struct windows_usb_api_backend *apib;
	char *dev_id;
	char *path;  // device interface path
	int sub_api; // for WinUSB-like APIs
	struct {
		char *path; // each interface needs a device interface path,
		const struct windows_usb_api_backend *apib; // an API backend (multiple drivers support),
		int sub_api;
		int8_t nb_endpoints; // and a set of endpoint addresses (USB_MAXENDPOINTS)
		uint8_t *endpoint;
		int current_altsetting;
		bool restricted_functionality;  // indicates if the interface functionality is restricted
						// by Windows (eg. HID keyboards or mice cannot do R/W)
	} usb_interface[USB_MAXINTERFACES];
	struct hid_device_priv *hid;
	PUSB_CONFIGURATION_DESCRIPTOR *config_descriptor; // list of pointers to the cached config descriptors
	GUID class_guid; // checked for change during re-enumeration
};

struct usbdk_device_handle_priv {
	// Not currently used
	char dummy;
};
 
enum WINUSB_ZLP {
	WINUSB_ZLP_UNSET = 0,
	WINUSB_ZLP_OFF = 1,
	WINUSB_ZLP_ON = 2
};

struct winusb_device_handle_priv {
	int active_interface;
	struct {
		HANDLE dev_handle; // WinUSB needs an extra handle for the file
		HANDLE api_handle; // used by the API to communicate with the device
		uint8_t zlp[USB_MAXENDPOINTS]; // Current per-endpoint SHORT_PACKET_TERMINATE status (enum WINUSB_ZLP)
	} interface_handle[USB_MAXINTERFACES];
	int autoclaim_count[USB_MAXINTERFACES]; // For auto-release
};

struct usbdk_transfer_priv {
	USB_DK_TRANSFER_REQUEST request;
	PULONG64 IsochronousPacketsArray;
	PUSB_DK_ISO_TRANSFER_RESULT IsochronousResultsArray;
};

struct winusb_transfer_priv {
	uint8_t interface_number;

	uint8_t *hid_buffer; // 1 byte extended data buffer, required for HID
	uint8_t *hid_dest;   // transfer buffer destination, required for HID
	size_t hid_expected_size;

	// For isochronous transfers with LibUSBk driver:
	void *iso_context;

	// For isochronous transfers with Microsoft WinUSB driver:
	void *isoch_buffer_handle; // The isoch_buffer_handle to free at the end of the transfer
	BOOL iso_break_stream;	// Whether the isoch. stream was to be continued in the last call of libusb_submit_transfer.
							// As we this structure is zeroed out upon initialization, we need to use inverse logic here.
	libusb_transfer_cb_fn iso_user_callback; // Original transfer callback of the user. Might be used for isochronous transfers.
};

struct windows_backend {
	int (*init)(struct libusb_context *ctx);
	void (*exit)(struct libusb_context *ctx);
	int (*get_device_list)(struct libusb_context *ctx,
		struct discovered_devs **discdevs);
	int (*open)(struct libusb_device_handle *dev_handle);
	void (*close)(struct libusb_device_handle *dev_handle);
	int (*get_active_config_descriptor)(struct libusb_device *device,
		void *buffer, size_t len);
	int (*get_config_descriptor)(struct libusb_device *device,
		uint8_t config_index, void *buffer, size_t len);
	int (*get_config_descriptor_by_value)(struct libusb_device *device,
		uint8_t bConfigurationValue, void **buffer);
	int (*get_configuration)(struct libusb_device_handle *dev_handle, uint8_t *config);
	int (*set_configuration)(struct libusb_device_handle *dev_handle, uint8_t config);
	int (*claim_interface)(struct libusb_device_handle *dev_handle, uint8_t interface_number);
	int (*release_interface)(struct libusb_device_handle *dev_handle, uint8_t interface_number);
	int (*set_interface_altsetting)(struct libusb_device_handle *dev_handle,
		uint8_t interface_number, uint8_t altsetting);
	int (*clear_halt)(struct libusb_device_handle *dev_handle,
		unsigned char endpoint);
	int (*reset_device)(struct libusb_device_handle *dev_handle);
	void (*destroy_device)(struct libusb_device *dev);
	int (*submit_transfer)(struct usbi_transfer *itransfer);
	int (*cancel_transfer)(struct usbi_transfer *itransfer);
	void (*clear_transfer_priv)(struct usbi_transfer *itransfer);
	enum libusb_transfer_status (*copy_transfer_data)(struct usbi_transfer *itransfer, DWORD length);
};

struct windows_context_priv {
	const struct windows_backend *backend;
	HANDLE completion_port;
	HANDLE completion_port_thread;
};

union windows_device_priv {
	struct usbdk_device_priv usbdk_priv;
	struct winusb_device_priv winusb_priv;
};

struct windows_device_handle_priv {
	struct list_head active_transfers;
	union {
		struct usbdk_device_handle_priv usbdk_priv;
		struct winusb_device_handle_priv winusb_priv;
	};
};

struct windows_transfer_priv {
	OVERLAPPED overlapped;
	HANDLE handle;
	struct list_head list;
	union {
		struct usbdk_transfer_priv usbdk_priv;
		struct winusb_transfer_priv winusb_priv;
	};
};

static inline struct usbdk_device_handle_priv *get_usbdk_device_handle_priv(struct libusb_device_handle *dev_handle)
{
	struct windows_device_handle_priv *handle_priv = usbi_get_device_handle_priv(dev_handle);
	return &handle_priv->usbdk_priv;
}

static inline struct winusb_device_handle_priv *get_winusb_device_handle_priv(struct libusb_device_handle *dev_handle)
{
	struct windows_device_handle_priv *handle_priv = usbi_get_device_handle_priv(dev_handle);
	return &handle_priv->winusb_priv;
}

static inline OVERLAPPED *get_transfer_priv_overlapped(struct usbi_transfer *itransfer)
{
	struct windows_transfer_priv *transfer_priv = usbi_get_transfer_priv(itransfer);
	return &transfer_priv->overlapped;
}

static inline void set_transfer_priv_handle(struct usbi_transfer *itransfer, HANDLE handle)
{
	struct windows_transfer_priv *transfer_priv = usbi_get_transfer_priv(itransfer);
	transfer_priv->handle = handle;
}

static inline struct usbdk_transfer_priv *get_usbdk_transfer_priv(struct usbi_transfer *itransfer)
{
	struct windows_transfer_priv *transfer_priv = usbi_get_transfer_priv(itransfer);
	return &transfer_priv->usbdk_priv;
}

static inline struct winusb_transfer_priv *get_winusb_transfer_priv(struct usbi_transfer *itransfer)
{
	struct windows_transfer_priv *transfer_priv = usbi_get_transfer_priv(itransfer);
	return &transfer_priv->winusb_priv;
}

extern const struct windows_backend usbdk_backend;
extern const struct windows_backend winusb_backend;

HMODULE load_system_library(struct libusb_context *ctx, const char *name);
unsigned long htab_hash(const char *str);
enum libusb_transfer_status usbd_status_to_libusb_transfer_status(USBD_STATUS status);
void windows_force_sync_completion(struct usbi_transfer *itransfer, ULONG size);

#if defined(ENABLE_LOGGING)
const char *windows_error_str(DWORD error_code);
#endif

#endif