/* ----------------------------------------------------------------------------
 *         ATMEL Microcontroller Software Support
 * ----------------------------------------------------------------------------
 * Copyright (c) 2008, Atmel Corporation
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the disclaimer below.
 *
 * Atmel's name may not be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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 */
/*
 * $Id: USBGetDescriptorRequest.c 23837 2010-10-13 13:45:05Z mahendran.p $
 */

/**\file
    Title: USBGetDescriptorRequest implementation

    About: Purpose
        Implementation of the USBGetDescriptorRequest class.
*/

/** \addtogroup usb_request
 *@{
 */

/*------------------------------------------------------------------------------
 *         Headers
 *------------------------------------------------------------------------------*/

#include "USBGetDescriptorRequest.h"

/*------------------------------------------------------------------------------
 *         Exported functions
 *------------------------------------------------------------------------------*/

/**
 * Returns the type of the descriptor requested by the host given the
 * corresponding GET_DESCRIPTOR request.
 * \param request Pointer to a USBGenericDescriptor instance.
 * \return Type of the requested descriptor.
 */
unsigned char USBGetDescriptorRequest_GetDescriptorType(
    const USBGenericRequest *request)
{
    /* Requested descriptor type is in the high-byte of the wValue field */
    return (USBGenericRequest_GetValue(request) >> 8) & 0xFF;
}

/**
 * Returns the index of the requested descriptor, given the corresponding
 * GET_DESCRIPTOR request.
 * \param request Pointer to a USBGenericDescriptor instance.
 * \return Index of the requested descriptor.
 */
unsigned char USBGetDescriptorRequest_GetDescriptorIndex(
    const USBGenericRequest *request)
{
    /* Requested descriptor index if in the low byte of the wValue field */
    return USBGenericRequest_GetValue(request) & 0xFF;
}

/**@}*/
