/***************************************************************************
 * Copyright (c) 2024 Microsoft Corporation
 * Copyright (c) 2026-present Eclipse ThreadX contributors
 *
 * This program and the accompanying materials are made available under the
 * terms of the MIT License which is available at
 * https://opensource.org/licenses/MIT.
 *
 * SPDX-License-Identifier: MIT
 **************************************************************************/


/**************************************************************************/
/**************************************************************************/
/**                                                                       */
/** USBX Component                                                        */
/**                                                                       */
/**   Host Stack                                                          */
/**                                                                       */
/**************************************************************************/
/**************************************************************************/


/* Include necessary system files.  */

#define UX_SOURCE_CODE

#include "ux_api.h"
#include "ux_host_stack.h"


/**************************************************************************/
/*                                                                        */
/*  FUNCTION                                               RELEASE        */
/*                                                                        */
/*    _ux_host_stack_class_get                            PORTABLE C      */
/*                                                           6.3.0        */
/*  AUTHOR                                                                */
/*                                                                        */
/*    Chaoqiong Xiao, Microsoft Corporation                               */
/*                                                                        */
/*  DESCRIPTION                                                           */
/*                                                                        */
/*    This function returns a pointer to the class container. A class     */
/*    needs to obtain its container from the USBX stack to search for     */
/*    instances when a driver or an application wants to open a device.   */
/*                                                                        */
/*    Note: The C string of class_name must be NULL-terminated and the    */
/*    length of it (without the NULL-terminator itself) must be no larger */
/*    than UX_MAX_CLASS_NAME_LENGTH.                                      */
/*                                                                        */
/*  INPUT                                                                 */
/*                                                                        */
/*    class_name                            Name of class                 */
/*    host_class                            Class pointer                 */
/*                                                                        */
/*  OUTPUT                                                                */
/*                                                                        */
/*    Completion Status                                                   */
/*                                                                        */
/*  CALLS                                                                 */
/*                                                                        */
/*    _ux_utility_string_length_check       Check C string and return its */
/*                                          length if null-terminated     */
/*    _ux_utility_memory_compare            Compare memory blocks         */
/*                                                                        */
/*  CALLED BY                                                             */
/*                                                                        */
/*    Application                                                         */
/*    USBX Components                                                     */
/*                                                                        */
/**************************************************************************/
UINT  _ux_host_stack_class_get(UCHAR *class_name, UX_HOST_CLASS **host_class)
{

UX_HOST_CLASS       *class_ptr;
#if !defined(UX_NAME_REFERENCED_BY_POINTER)
UINT                status;
UINT                class_name_length =  0;
#endif
#if UX_MAX_CLASS_DRIVER > 1
ULONG               class_index;
#endif

#if !defined(UX_NAME_REFERENCED_BY_POINTER)
    /* Get the length of the class name (exclude null-terminator).  */
    status =  _ux_utility_string_length_check(class_name, &class_name_length, UX_MAX_CLASS_NAME_LENGTH);
    if (status)
        return(status);
#endif

    /* Get first class.  */
    class_ptr =  _ux_system_host -> ux_system_host_class_array;

#if UX_MAX_CLASS_DRIVER > 1
    /* We need to parse the class driver table.  */
    for (class_index = 0; class_index < _ux_system_host -> ux_system_host_max_class; class_index++)
    {
#endif

        /* Check if this class is already being used. */
        if (class_ptr -> ux_host_class_status == UX_USED)
        {

            /* We have found a container. Check if this is the one we need (compare including null-terminator).  */
            if (ux_utility_name_match(class_ptr -> ux_host_class_name, class_name, class_name_length + 1))
            {

                /* The class container was found. Update the pointer to the class container for the caller.  */
                *host_class =  class_ptr;

                /* Return success.  */
                return(UX_SUCCESS);
            }
        }

#if UX_MAX_CLASS_DRIVER > 1
        /* Move to the next class.  */
        class_ptr++;
    }
#endif

    /* If trace is enabled, insert this event into the trace buffer.  */
    UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_HOST_CLASS_UNKNOWN, class_name, 0, 0, UX_TRACE_ERRORS, 0, 0)

    /* This class does not exist, return an error.  */
    return(UX_HOST_CLASS_UNKNOWN);
}


/**************************************************************************/
/*                                                                        */
/*  FUNCTION                                               RELEASE        */
/*                                                                        */
/*    _uxe_host_stack_class_get                           PORTABLE C      */
/*                                                           6.3.0        */
/*  AUTHOR                                                                */
/*                                                                        */
/*    Chaoqiong Xiao, Microsoft Corporation                               */
/*                                                                        */
/*  DESCRIPTION                                                           */
/*                                                                        */
/*    This function checks errors in host stack class get function call.  */
/*                                                                        */
/*  INPUT                                                                 */
/*                                                                        */
/*    class_name                            Name of class                 */
/*    host_class                            Class pointer                 */
/*                                                                        */
/*  OUTPUT                                                                */
/*                                                                        */
/*    None                                                                */
/*                                                                        */
/*  CALLS                                                                 */
/*                                                                        */
/*    _ux_host_stack_class_get              Host stack class get          */
/*                                                                        */
/*  CALLED BY                                                             */
/*                                                                        */
/*    Application                                                         */
/*                                                                        */
/**************************************************************************/
UINT  _uxe_host_stack_class_get(UCHAR *class_name, UX_HOST_CLASS **host_class)
{

    /* Sanity checks.  */
    if ((class_name == UX_NULL) || (host_class == UX_NULL))
        return(UX_INVALID_PARAMETER);

    /* Invoke class get function.  */
    return(_ux_host_stack_class_get(class_name, host_class));
}
