dp.c File Reference

USB descriptor parser (implementation). More...

#include <stdio.h>
#include <str_error.h>
#include <errno.h>
#include <assert.h>
#include <bool.h>
#include <usb/dev/dp.h>
#include <usb/descriptor.h>

Go to the source code of this file.

Defines
#define	LAST_NESTING   { -1, -1 }
#define	NESTING(parentname, childname)
Functions
static int	get_descriptor_type (usb_dp_parser_data_t *data, uint8_t *start)
	Get descriptor type.
static uint8_t *	get_next_descriptor (usb_dp_parser_data_t *data, uint8_t *current)
	Get next descriptor regardless of the nesting.
static bool	is_nested_descriptor (usb_dp_parser_t *parser, usb_dp_parser_data_t *data, uint8_t *child, uint8_t *parent)
	Tells whether descriptors could be nested.
static bool	is_nested_descriptor_type (usb_dp_parser_t *parser, int child, int parent)
	Tells whether descriptors could be nested.
static bool	is_valid_descriptor_pointer (usb_dp_parser_data_t *data, uint8_t *ptr)
	Tells whether pointer points inside descriptor data.
static uint8_t *	skip_nested_descriptors (usb_dp_parser_t *parser, usb_dp_parser_data_t *data, uint8_t *parent)
	Skip all nested descriptors.
static void	usb_dp_browse_simple_internal (usb_dp_parser_t *parser, usb_dp_parser_data_t *data, uint8_t *root, size_t depth, void(*callback)(uint8_t *, size_t, void *), void *arg)
	Browser of the descriptor tree.
uint8_t *	usb_dp_get_nested_descriptor (usb_dp_parser_t *parser, usb_dp_parser_data_t *data, uint8_t *parent)
	Find first nested descriptor of given parent.
uint8_t *	usb_dp_get_sibling_descriptor (usb_dp_parser_t *parser, usb_dp_parser_data_t *data, uint8_t *parent, uint8_t *sibling)
	Get sibling descriptor.
void	usb_dp_walk_simple (uint8_t *descriptors, size_t descriptors_size, usb_dp_descriptor_nesting_t *descriptor_nesting, void(*callback)(uint8_t *, size_t, void *), void *arg)
	Browse flatten descriptor tree.
Variables
usb_dp_descriptor_nesting_t	usb_dp_standard_descriptor_nesting []
	Nesting of standard USB descriptors.

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Detailed Description

USB descriptor parser (implementation).

The descriptor parser is a generic parser for structure, where individual items are stored in single buffer and each item begins with length followed by type. These types are organized into tree hierarchy.

The parser is able of only two actions: find first child and find next sibling.

Definition in file dp.c.

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