source: mainline/uspace/lib/usbhid/src/hiddescriptor.c@ a35b458

/*
 * Copyright (c) 2011 Matej Klonfar
 * Copyright (c) 2018 Ondrej Hlavaty
 * 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 following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT 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 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup libusbhid
 * @{
 */
/** @file
 * HID report descriptor and report data parser implementation.
 */
#include <usb/hid/hidparser.h>
#include <errno.h>
#include <stdio.h>
#include <mem.h>
#include <usb/debug.h>
#include <assert.h>
#include <stdlib.h>


/*
 * Constants defining current parsing mode for correct parsing of the set of
 * local tags (usage) enclosed in delimter tags.
 */
/**
 * Second delimiter tag was read. The set of local items (usage) ended.
 */
#define OUTSIDE_DELIMITER_SET   0

/**
 * First delimiter tag was read. The set of local items (usage) started.
 */
#define START_DELIMITER_SET     1

/**
 * Parser is in the set of local items.
 */
#define INSIDE_DELIMITER_SET    2



/** The new report item flag. Used to determine when the item is completly
 * configured and should be added to the report structure
 */
#define USB_HID_NEW_REPORT_ITEM 1

/** No special action after the report descriptor tag is processed should be
 * done
 */
#define USB_HID_NO_ACTION       2

#define USB_HID_RESET_OFFSET    3

#define USB_HID_INVALID                 -98
/** Unknown tag was founded in report descriptor data*/
#define USB_HID_UNKNOWN_TAG             -99


/**
 * Checks if given collection path is already present in report structure and
 * inserts it if not.
 *
 * @param report Report structure
 * @param cmp_path The collection path
 * @return Pointer to the result collection path in report structure.
 * @retval NULL If some error occurs
 */
usb_hid_report_path_t *usb_hid_report_path_try_insert(usb_hid_report_t *report,
    usb_hid_report_path_t *cmp_path)
{
        link_t *path_it = report->collection_paths.head.next;
        usb_hid_report_path_t *path = NULL;

        if((report == NULL) || (cmp_path == NULL)) {
                return NULL;
        }

        while(path_it != &report->collection_paths.head) {
                path = list_get_instance(path_it, usb_hid_report_path_t,
                                cpath_link);

                if(usb_hid_report_compare_usage_path(path, cmp_path,
                                        USB_HID_PATH_COMPARE_STRICT) == 0){
                        break;
                }
                path_it = path_it->next;
        }
        if(path_it == &report->collection_paths.head) {
                path = usb_hid_report_path_clone(cmp_path);
                if(path == NULL) {
                        return NULL;
                }
                list_append(&path->cpath_link, &report->collection_paths);
                report->collection_paths_count++;

                return path;
        }
        else {
                return list_get_instance(path_it, usb_hid_report_path_t,
                                cpath_link);
        }
}


/**
 * Initialize the report descriptor parser structure
 *
 * @param parser Report descriptor parser structure
 * @return Error code
 * @retval EINVAL If no report structure was given
 * @retval EOK If report structure was successfully initialized
 */
errno_t usb_hid_report_init(usb_hid_report_t *report)
{
        if (report == NULL) {
                return EINVAL;
        }

        memset(report, 0, sizeof(usb_hid_report_t));
        list_initialize(&report->reports);
        list_initialize(&report->collection_paths);

        report->use_report_ids = 0;
    return EOK;
}



/**
 *
 *
 * @param report Report structure in which the new report items should be
 *               stored
 * @param report_item Current report descriptor's parsing state table
 * @return Error code
 * @retval EOK If all fields were successfully append to report
 * @retval EINVAL If invalid parameters (NULL) was given
 * @retval ENOMEM If there is no memmory to store new report description
 *
 */
errno_t usb_hid_report_append_fields(usb_hid_report_t *report,
                usb_hid_report_item_t *report_item) {

        usb_hid_report_field_t *field;
        int i;

        uint32_t *usages;
        int usages_used=0;

        if((report == NULL) || (report_item == NULL)) {
                return EINVAL;
        }

        if(report_item->usages_count > 0){
                usages = malloc(sizeof(uint32_t) * report_item->usages_count);
                memcpy(usages, report_item->usages, sizeof(int32_t) *
                                report_item->usages_count);
        }
        else {
                usages = NULL;
        }

        usb_hid_report_path_t *path = report_item->usage_path;
        for(i=0; i<report_item->count; i++){

                field = malloc(sizeof(usb_hid_report_field_t));
                if(field == NULL) {
                        return ENOMEM;
                }

                memset(field, 0, sizeof(usb_hid_report_field_t));
                link_initialize(&field->ritems_link);

                /* fill the attributes */
                field->logical_minimum = report_item->logical_minimum;
                field->logical_maximum = report_item->logical_maximum;
                field->physical_minimum = report_item->physical_minimum;
                field->physical_maximum = report_item->physical_maximum;

                if(USB_HID_ITEM_FLAG_VARIABLE(report_item->item_flags) == 0){
                        /*
                        Store usage array. The Correct Usage Page and Usage is
                        depending on data in report and will be filled later
                        */
                        field->usage = 0;
                        field->usage_page = 0; //report_item->usage_page;

                        field->usages_count = report_item->usages_count;
                        field->usages = usages;
                        usages_used = 1;
                }
                else {

                        /* Fill the correct Usage and Usage Page */
                        int32_t usage;
                        if(i < report_item->usages_count) {
                                usage = report_item->usages[i];
                        }
                        else {
                                usage = report_item->usages[
                                        report_item->usages_count- 1];
                        }

                        if(USB_HID_IS_EXTENDED_USAGE(usage)){
                                field->usage = USB_HID_EXTENDED_USAGE(usage);
                                field->usage_page =
                                        USB_HID_EXTENDED_USAGE_PAGE(usage);
                        }
                        else {
                                // should not occur
                                field->usage = usage;
                                field->usage_page = report_item->usage_page;
                        }
                }

                usb_hid_report_set_last_item(path, USB_HID_TAG_CLASS_GLOBAL,
                                field->usage_page);
                usb_hid_report_set_last_item(path, USB_HID_TAG_CLASS_LOCAL,
                                field->usage);

                field->collection_path =
                        usb_hid_report_path_try_insert(report, path);

                field->size = report_item->size;

                field->offset = report_item->offset + (i * report_item->size);

                if(report->use_report_ids != 0) {
                        field->offset += 8;
                        report->use_report_ids = 1;
                }

                field->item_flags = report_item->item_flags;

                /* find the right report list*/
                usb_hid_report_description_t *report_des;
                report_des = usb_hid_report_find_description(report,
                        report_item->id, report_item->type);

                if(report_des == NULL){
                        report_des = malloc(
                                sizeof(usb_hid_report_description_t));
                        if(report_des == NULL) {
                                return ENOMEM;
                        }

                        memset(report_des, 0,
                                sizeof(usb_hid_report_description_t));

                        report_des->type = report_item->type;
                        report_des->report_id = report_item->id;
                        if(report_des->report_id != 0) {
                                /* set up the bit length by report_id field */
                                report_des->bit_length = 8;
                        }

                        link_initialize (&report_des->reports_link);
                        list_initialize (&report_des->report_items);

                        list_append(&report_des->reports_link, &report->reports);
                        report->report_count++;
                }

                /* append this field to the end of founded report list */
                list_append(&field->ritems_link, &report_des->report_items);

                /* update the sizes */
                report_des->bit_length += field->size;
                report_des->item_length++;

        }

        // free only when not used!!!
        if(usages && usages_used == 0) {
                free(usages);
        }

        return EOK;
}

/**
 * Finds description of report with given report_id and of given type in
 * opaque report structure.
 *
 * @param report Opaque structure containing the parsed report descriptor
 * @param report_id ReportId of report we are searching
 * @param type Type of report we are searching
 * @return Pointer to the particular report description
 * @retval NULL If no description is founded
 */
usb_hid_report_description_t * usb_hid_report_find_description(
                const usb_hid_report_t *report, uint8_t report_id,
                usb_hid_report_type_t type) {

        if(report == NULL) {
                return NULL;
        }

        list_foreach(report->reports, reports_link,
            usb_hid_report_description_t, report_des) {
                // if report id not set, return the first of the type
                if(((report_des->report_id == report_id) || (report_id == 0)) &&
                   (report_des->type == type)) {
                        return report_des;
                }
        }

        return NULL;
}


/** Parse HID report descriptor.
 *
 * @param parser Opaque HID report parser structure.
 * @param data Data describing the report.
 * @return Error code.
 * @retval ENOMEM If no more memmory is available
 * @retval EINVAL If invalid data are founded
 * @retval EOK If report descriptor is successfully parsed
 */
errno_t usb_hid_parse_report_descriptor(usb_hid_report_t *report,
    const uint8_t *data, size_t size)
{
        size_t i=0;
        uint8_t tag=0;
        uint8_t item_size=0;
        int class=0;
        int ret;
        usb_hid_report_item_t *report_item=0;
        usb_hid_report_item_t *new_report_item;
        usb_hid_report_path_t *usage_path;

        size_t offset_input=0;
        size_t offset_output=0;
        size_t offset_feature=0;

        link_t *item_link;

        list_t stack;
        list_initialize(&stack);

        /* parser structure initialization*/
        if(usb_hid_report_init(report) != EOK) {
                return EINVAL;
        }

        /*report item initialization*/
        if(!(report_item=malloc(sizeof(usb_hid_report_item_t)))){
                return ENOMEM;
        }
        memset(report_item, 0, sizeof(usb_hid_report_item_t));
        link_initialize(&(report_item->link));

        /* usage path context initialization */
        if(!(usage_path=usb_hid_report_path())){
                return ENOMEM;
        }
        usb_hid_report_path_append_item(usage_path, 0, 0);

        while(i<size){
                if(!USB_HID_ITEM_IS_LONG(data[i])){

                        if((i+USB_HID_ITEM_SIZE(data[i]))>= size){
                                return EINVAL;
                        }

                        tag = USB_HID_ITEM_TAG(data[i]);
                        item_size = USB_HID_ITEM_SIZE(data[i]);
                        class = USB_HID_ITEM_TAG_CLASS(data[i]);

                        ret = usb_hid_report_parse_tag(tag,class,data+i+1,
                                item_size,report_item, usage_path);

                        switch(ret){
                        case USB_HID_NEW_REPORT_ITEM:
                                /* store report item to report and create the
                                 * new one store current collection path
                                 */
                                report_item->usage_path = usage_path;

                                usb_hid_report_path_set_report_id(
                                     report_item->usage_path, report_item->id);

                                if(report_item->id != 0){
                                        report->use_report_ids = 1;
                                }

                                switch(tag) {
                                case USB_HID_REPORT_TAG_INPUT:
                                        report_item->type =
                                            USB_HID_REPORT_TYPE_INPUT;

                                        report_item->offset = offset_input;
                                        offset_input += report_item->count *
                                            report_item->size;
                                        break;

                                case USB_HID_REPORT_TAG_OUTPUT:
                                        report_item->type =
                                            USB_HID_REPORT_TYPE_OUTPUT;

                                        report_item->offset = offset_output;
                                        offset_output += report_item->count *
                                            report_item->size;
                                        break;

                                case USB_HID_REPORT_TAG_FEATURE:
                                        report_item->type =
                                            USB_HID_REPORT_TYPE_FEATURE;

                                        report_item->offset = offset_feature;
                                        offset_feature += report_item->count *
                                                report_item->size;
                                        break;

                                default:
                                        usb_log_debug2(
                                            "\tjump over - tag %X\n", tag);
                                        break;
                                }

                                /*
                                 * append new fields to the report structure
                                 */
                                usb_hid_report_append_fields(report,
                                    report_item);

                                /* reset local items */
                                usb_hid_report_reset_local_items (report_item);
                                break;

                        case USB_HID_RESET_OFFSET:
                                offset_input = 0;
                                offset_output = 0;
                                offset_feature = 0;
                                usb_hid_report_path_set_report_id (usage_path,
                                    report_item->id);
                                break;

                        case USB_HID_REPORT_TAG_PUSH:
                                // push current state to stack
                                new_report_item = usb_hid_report_item_clone(
                                    report_item);

                                usb_hid_report_path_t *tmp_path =
                                    usb_hid_report_path_clone(usage_path);

                                new_report_item->usage_path = tmp_path;

                                list_prepend (&new_report_item->link, &stack);
                                break;
                        case USB_HID_REPORT_TAG_POP:
                                // restore current state from stack
                                item_link = list_first(&stack);
                                if (item_link == NULL) {
                                        return EINVAL;
                                }
                                free(report_item);

                                report_item = list_get_instance(item_link,
                                    usb_hid_report_item_t, link);

                                usb_hid_report_usage_path_t *tmp_usage_path;
                                tmp_usage_path = list_get_instance(
                                    report_item->usage_path->cpath_link.prev,
                                    usb_hid_report_usage_path_t, rpath_items_link);

                                usb_hid_report_set_last_item(usage_path,
                                    USB_HID_TAG_CLASS_GLOBAL, tmp_usage_path->usage_page);

                                usb_hid_report_set_last_item(usage_path,
                                    USB_HID_TAG_CLASS_LOCAL, tmp_usage_path->usage);

                                usb_hid_report_path_free(report_item->usage_path);
                                list_remove (item_link);

                                break;

                        default:
                                // nothing special to do
                                break;
                        }

                        /* jump over the processed block */
                        i += 1 + USB_HID_ITEM_SIZE(data[i]);
                }
                else{
                        // TBD
                        i += 3 + USB_HID_ITEM_SIZE(data[i+1]);
                }


        }

        return EOK;
}



/**
 * Parse one tag of the report descriptor
 *
 * @param Tag to parse
 * @param Report descriptor buffer
 * @param Size of data belongs to this tag
 * @param Current report item structe
 * @return Code of action to be done next
 */
int usb_hid_report_parse_tag(uint8_t tag, uint8_t class, const uint8_t *data,
        size_t item_size, usb_hid_report_item_t *report_item,
        usb_hid_report_path_t *usage_path) {

        int ret;

        switch(class){
        case USB_HID_TAG_CLASS_MAIN:

                if((ret=usb_hid_report_parse_main_tag(tag, data, item_size,
                        report_item, usage_path)) == 0) {

                        return USB_HID_NEW_REPORT_ITEM;
                }
                else {
                        return ret;
                }
                break;

        case USB_HID_TAG_CLASS_GLOBAL:
                return usb_hid_report_parse_global_tag(tag, data, item_size,
                        report_item, usage_path);
                break;

        case USB_HID_TAG_CLASS_LOCAL:
                return usb_hid_report_parse_local_tag(tag, data, item_size,
                        report_item, usage_path);
                break;

        default:
                return USB_HID_NO_ACTION;
        }
}

/**
 * Parse main tags of report descriptor
 *
 * @param Tag identifier
 * @param Data buffer
 * @param Length of data buffer
 * @param Current state table
 * @return 0 or USB_HID_ code
 */

int usb_hid_report_parse_main_tag(uint8_t tag, const uint8_t *data,
        size_t item_size, usb_hid_report_item_t *report_item,
        usb_hid_report_path_t *usage_path)
{
        usb_hid_report_usage_path_t *path_item;

        switch(tag)
        {
        case USB_HID_REPORT_TAG_INPUT:
        case USB_HID_REPORT_TAG_OUTPUT:
        case USB_HID_REPORT_TAG_FEATURE:
                report_item->item_flags = *data;
                return 0;
                break;

        case USB_HID_REPORT_TAG_COLLECTION:

                /* store collection atributes */
                path_item = list_get_instance(list_first(&usage_path->items),
                        usb_hid_report_usage_path_t, rpath_items_link);
                path_item->flags = *data;

                /* set last item */
                usb_hid_report_set_last_item(usage_path,
                        USB_HID_TAG_CLASS_GLOBAL,
                        USB_HID_EXTENDED_USAGE_PAGE(report_item->usages[
                                report_item->usages_count-1]));

                usb_hid_report_set_last_item(usage_path,
                        USB_HID_TAG_CLASS_LOCAL,
                        USB_HID_EXTENDED_USAGE(report_item->usages[
                                report_item->usages_count-1]));

                /* append the new one which will be set by common usage/usage
                 * page */
                usb_hid_report_path_append_item(usage_path,
                        report_item->usage_page,
                        report_item->usages[report_item->usages_count-1]);

                usb_hid_report_reset_local_items (report_item);
                return USB_HID_NO_ACTION;
                break;

        case USB_HID_REPORT_TAG_END_COLLECTION:
                usb_hid_report_remove_last_item(usage_path);
                return USB_HID_NO_ACTION;
                break;

        default:
                return USB_HID_NO_ACTION;
        }

        return 0;
}

/**
 * Parse global tags of report descriptor
 *
 * @param Tag identifier
 * @param Data buffer
 * @param Length of data buffer
 * @param Current state table
 * @return 0 or USB_HID_ code
 */
int usb_hid_report_parse_global_tag(uint8_t tag, const uint8_t *data,
        size_t item_size, usb_hid_report_item_t *report_item,
        usb_hid_report_path_t *usage_path) {

        switch(tag)
        {
        case USB_HID_REPORT_TAG_USAGE_PAGE:
                report_item->usage_page =
                        usb_hid_report_tag_data_uint32(data, item_size);
                break;

        case USB_HID_REPORT_TAG_LOGICAL_MINIMUM:
                report_item->logical_minimum = USB_HID_UINT32_TO_INT32(
                        usb_hid_report_tag_data_uint32(data,item_size),
                        item_size * 8);
                break;

        case USB_HID_REPORT_TAG_LOGICAL_MAXIMUM:
                report_item->logical_maximum = USB_HID_UINT32_TO_INT32(
                        usb_hid_report_tag_data_uint32(data,item_size),
                        item_size * 8);
                break;

        case USB_HID_REPORT_TAG_PHYSICAL_MINIMUM:
                report_item->physical_minimum = USB_HID_UINT32_TO_INT32(
                        usb_hid_report_tag_data_uint32(data,item_size),
                        item_size * 8);
                break;

        case USB_HID_REPORT_TAG_PHYSICAL_MAXIMUM:
                report_item->physical_maximum = USB_HID_UINT32_TO_INT32(
                        usb_hid_report_tag_data_uint32(data,item_size),
                        item_size * 8);
                break;

        case USB_HID_REPORT_TAG_UNIT_EXPONENT:
                report_item->unit_exponent = usb_hid_report_tag_data_uint32(
                        data,item_size);
                break;

        case USB_HID_REPORT_TAG_UNIT:
                report_item->unit = usb_hid_report_tag_data_uint32(
                        data,item_size);
                break;

        case USB_HID_REPORT_TAG_REPORT_SIZE:
                report_item->size = usb_hid_report_tag_data_uint32(
                        data,item_size);
                break;

        case USB_HID_REPORT_TAG_REPORT_COUNT:
                report_item->count = usb_hid_report_tag_data_uint32(
                        data,item_size);
                break;

        case USB_HID_REPORT_TAG_REPORT_ID:
                report_item->id = usb_hid_report_tag_data_uint32(data,
                        item_size);
                return USB_HID_RESET_OFFSET;
                break;

        case USB_HID_REPORT_TAG_PUSH:
        case USB_HID_REPORT_TAG_POP:
                /*
                 * stack operations are done in top level parsing
                 * function
                 */
                return tag;
                break;

        default:
                return USB_HID_NO_ACTION;
        }

        return 0;
}

/**
 * Parse local tags of report descriptor
 *
 * @param Tag identifier
 * @param Data buffer
 * @param Length of data buffer
 * @param Current state table
 * @return 0 or USB_HID_ code
 */
int usb_hid_report_parse_local_tag(uint8_t tag, const uint8_t *data,
    size_t item_size, usb_hid_report_item_t *report_item,
    usb_hid_report_path_t *usage_path)
{
        int32_t extended_usage;

        switch (tag) {
        case USB_HID_REPORT_TAG_USAGE:
                switch (report_item->in_delimiter) {
                case INSIDE_DELIMITER_SET:
                        /*
                         * Nothing to do.
                         * We catch only the first one
                         */
                        break;

                case START_DELIMITER_SET:
                        report_item->in_delimiter = INSIDE_DELIMITER_SET;
                        /* Fallthrough */
                case OUTSIDE_DELIMITER_SET:
                        extended_usage = ((report_item->usage_page) << 16);
                        extended_usage +=
                            usb_hid_report_tag_data_uint32(data, item_size);

                        report_item->usages[report_item->usages_count] =
                            extended_usage;

                        report_item->usages_count++;
                        break;
                }
                break;

        case USB_HID_REPORT_TAG_USAGE_MINIMUM:
                if (item_size == 3) {
                        /* Usage extended usages */
                        report_item->extended_usage_page =
                            USB_HID_EXTENDED_USAGE_PAGE(
                            usb_hid_report_tag_data_uint32(data, item_size));


                        report_item->usage_minimum =
                            USB_HID_EXTENDED_USAGE(
                            usb_hid_report_tag_data_uint32(data, item_size));
                } else {
                        report_item->usage_minimum =
                            usb_hid_report_tag_data_uint32(data, item_size);
                }
                break;

        case USB_HID_REPORT_TAG_USAGE_MAXIMUM:
                if (item_size == 3) {
                        if (report_item->extended_usage_page !=
                            USB_HID_EXTENDED_USAGE_PAGE(
                            usb_hid_report_tag_data_uint32(data, item_size))) {
                                return USB_HID_INVALID;
                        }

                        /* Usage extended usages */
                        report_item->extended_usage_page =
                            USB_HID_EXTENDED_USAGE_PAGE(
                            usb_hid_report_tag_data_uint32(data,item_size));

                        report_item->usage_maximum =
                            USB_HID_EXTENDED_USAGE(
                            usb_hid_report_tag_data_uint32(data,item_size));
                } else {
                        report_item->usage_maximum =
                            usb_hid_report_tag_data_uint32(data,item_size);
                }

                /* Put the records into the usages array */
                for (int32_t i = report_item->usage_minimum;
                    i <= report_item->usage_maximum; i++) {

                        if (report_item->extended_usage_page) {
                                report_item->usages[report_item->usages_count++] =
                                    (report_item->extended_usage_page << 16) + i;
                        } else {
                                report_item->usages[report_item->usages_count++] =
                                    (report_item->usage_page << 16) + i;
                        }
                }
                report_item->extended_usage_page = 0;

                break;

        case USB_HID_REPORT_TAG_DESIGNATOR_INDEX:
                report_item->designator_index =
                    usb_hid_report_tag_data_uint32(data, item_size);
                break;

        case USB_HID_REPORT_TAG_DESIGNATOR_MINIMUM:
                report_item->designator_minimum =
                    usb_hid_report_tag_data_uint32(data, item_size);
                break;

        case USB_HID_REPORT_TAG_DESIGNATOR_MAXIMUM:
                report_item->designator_maximum =
                    usb_hid_report_tag_data_uint32(data, item_size);
                break;

        case USB_HID_REPORT_TAG_STRING_INDEX:
                report_item->string_index =
                    usb_hid_report_tag_data_uint32(data, item_size);
                break;

        case USB_HID_REPORT_TAG_STRING_MINIMUM:
                report_item->string_minimum =
                    usb_hid_report_tag_data_uint32(data, item_size);
                break;

        case USB_HID_REPORT_TAG_STRING_MAXIMUM:
                report_item->string_maximum =
                    usb_hid_report_tag_data_uint32(data, item_size);
                break;

        case USB_HID_REPORT_TAG_DELIMITER:
                report_item->in_delimiter =
                    usb_hid_report_tag_data_uint32(data, item_size);
                break;

        default:
                return USB_HID_NO_ACTION;
        }

        return 0;
}

/**
 * Converts raw data to uint32 (thats the maximum length of short item data)
 *
 * @param Data buffer
 * @param Size of buffer
 * @return Converted int32 number
 */
uint32_t usb_hid_report_tag_data_uint32(const uint8_t *data, size_t size)
{
        unsigned int i;
        uint32_t result;

        result = 0;
        for(i=0; i<size; i++) {
                result = (result | (data[i]) << (i*8));
        }

        return result;
}


/**
 * Prints content of given list of report items.
 *
 * @param List of report items (usb_hid_report_item_t)
 * @return void
 */
void usb_hid_descriptor_print_list(list_t *list)
{
        if(list == NULL || list_empty(list)) {
            usb_log_debug("\tempty");
            return;
        }

        list_foreach(*list, ritems_link, usb_hid_report_field_t,
            report_item) {
                usb_log_debug("\t\tOFFSET: %u", report_item->offset);
                usb_log_debug("\t\tSIZE: %zu", report_item->size);
                usb_log_debug("\t\tLOGMIN: %d",
                        report_item->logical_minimum);
                usb_log_debug("\t\tLOGMAX: %d",
                        report_item->logical_maximum);
                usb_log_debug("\t\tPHYMIN: %d",
                        report_item->physical_minimum);
                usb_log_debug("\t\tPHYMAX: %d",
                        report_item->physical_maximum);
                usb_log_debug("\t\ttUSAGEMIN: %X",
                        report_item->usage_minimum);
                usb_log_debug("\t\tUSAGEMAX: %X",
                               report_item->usage_maximum);
                usb_log_debug("\t\tUSAGES COUNT: %zu",
                        report_item->usages_count);

                usb_log_debug("\t\tVALUE: %X", report_item->value);
                usb_log_debug("\t\ttUSAGE: %X", report_item->usage);
                usb_log_debug("\t\tUSAGE PAGE: %X", report_item->usage_page);

                usb_hid_print_usage_path(report_item->collection_path);
        }
}


/**
 * Prints content of given report descriptor in human readable format.
 *
 * @param parser Parsed descriptor to print
 * @return void
 */
void usb_hid_descriptor_print(usb_hid_report_t *report)
{
        if (report == NULL)
                return;

        list_foreach(report->reports, reports_link,
            usb_hid_report_description_t, report_des) {
                usb_log_debug("Report ID: %d", report_des->report_id);
                usb_log_debug("\tType: %d", report_des->type);
                usb_log_debug("\tLength: %zu", report_des->bit_length);
                usb_log_debug("\tB Size: %zu",
                        usb_hid_report_byte_size(report,
                                report_des->report_id,
                                report_des->type));
                usb_log_debug("\tItems: %zu", report_des->item_length);

                usb_hid_descriptor_print_list(&report_des->report_items);
        }
}



/** Frees the HID report descriptor parser structure
 *
 * @param parser Opaque HID report parser structure
 * @return void
 */
void usb_hid_report_deinit(usb_hid_report_t *report)
{
        if(report == NULL){
                return;
        }

        // free collection paths
        link_t *path_link;
        usb_hid_report_path_t *path;
        while(!list_empty(&report->collection_paths)) {
                path_link = list_first(&report->collection_paths);
                path = list_get_instance(path_link,
                    usb_hid_report_path_t, cpath_link);

                list_remove(path_link);
                usb_hid_report_path_free(path);
        }

        // free report items
        usb_hid_report_description_t *report_des;
        usb_hid_report_field_t *field;
        while(!list_empty(&report->reports)) {
                report_des = list_get_instance(list_first(&report->reports),
                                usb_hid_report_description_t, reports_link);

                list_remove(&report_des->reports_link);

                while(!list_empty(&report_des->report_items)) {
                        field = list_get_instance(
                            list_first(&report_des->report_items),
                            usb_hid_report_field_t, ritems_link);

                        list_remove(&field->ritems_link);

                        free(field);
                }

                free(report_des);
        }

        return;
}


/**
 * @}
 */