webusb_defs.h

/*
 * Copyright (c) 2016, Devan Lai
 *
 * Permission to use, copy, modify, and/or distribute this software
 * for any purpose with or without fee is hereby granted, provided
 * that the above copyright notice and this permission notice
 * appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
 * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
 * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef WEBUSB_DEFS_H_INCLUDED
#define WEBUSB_DEFS_H_INCLUDED

#include <stdint.h>

#define WEBUSB_REQ_GET_URL 0x02

#define WEBUSB_DT_DESCRIPTOR_SET_HEADER 0
#define WEBUSB_DT_CONFIGURATION_SUBSET_HEADER 1
#define WEBUSB_DT_FUNCTION_SUBSET_HEADER 2
#define WEBUSB_DT_URL 3

#define WEBUSB_URL_SCHEME_HTTP 0
#define WEBUSB_URL_SCHEME_HTTPS 1

struct webusb_platform_descriptor {
  uint8_t bLength;
  uint8_t bDescriptorType;
  uint8_t bDevCapabilityType;
  uint8_t bReserved;
  uint8_t platformCapabilityUUID[16];
  uint16_t bcdVersion;
  uint8_t bVendorCode;
  uint8_t iLandingPage;
} __attribute__((packed));

#define WEBUSB_PLATFORM_DESCRIPTOR_SIZE \
  sizeof(struct webusb_platform_descriptor)

// from https://wicg.github.io/webusb/#webusb-platform-capability-descriptor
// see also this (for endianness explanation)
// https://github.com/WICG/webusb/issues/115#issuecomment-352206549
#define WEBUSB_UUID                                                         \
  {                                                                         \
    0x38, 0xB6, 0x08, 0x34, 0xA9, 0x09, 0xA0, 0x47, 0x8B, 0xFD, 0xA0, 0x76, \
        0x88, 0x15, 0xB6, 0x65                                              \
  }

struct webusb_url_descriptor {
  uint8_t bLength;
  uint8_t bDescriptorType;
  uint8_t bScheme;
  char URL[];
} __attribute__((packed));

#define WEBUSB_DT_URL_DESCRIPTOR_SIZE 3

#endif