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/******************************************************************************
*
* Copyright 2014 Google, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************/
#include <arpa/inet.h>
#include <base/logging.h>
#include <endian.h>
#include <string.h>
#include "btcore/include/device_class.h"
#include "check.h"
typedef struct _bt_device_class_t {
uint32_t unused : 2; // LSBs
uint32_t minor_device : 6;
uint32_t major_device : 5;
uint32_t major_service : 11; // MSBs
} __attribute__((__packed__)) _bt_device_class_t;
// Convenience to interpret raw device class bytes.
#define DC(x) ((_bt_device_class_t*)(x))
// Ensure the internal device class implementation and public one
// have equal size.
static_assert(sizeof(_bt_device_class_t) == sizeof(bt_device_class_t),
"Internal and external device class implementation should have "
"the same size");
// [Major Service Classes]
// (https://www.bluetooth.org/en-us/specification/assigned-numbers/baseband)
enum {
DC_LIMITED_DISCOVERABLE_MODE = 0x0001,
DC_RESERVED14 = 0x0002,
DC_RESERVED15 = 0x0004,
DC_POSITIONING = 0x0008,
DC_NETWORKING = 0x0010,
DC_RENDERING = 0x0020,
DC_CAPTURING = 0x0040,
DC_OBJECT_TRANSFER = 0x0080,
DC_AUDIO = 0x0100,
DC_TELEPHONY = 0x0200,
DC_INFORMATION = 0x0400,
};
static bool device_class_get_major_service_(const bt_device_class_t* dc,
int bitmask);
static void device_class_clr_major_service_(bt_device_class_t* dc, int bitmask);
static void device_class_set_major_service_(bt_device_class_t* dc, int bitmask);
void device_class_from_stream(bt_device_class_t* dc, const uint8_t* data) {
CHECK(dc != NULL);
CHECK(data != NULL);
*dc = *(bt_device_class_t*)data;
}
int device_class_to_stream(const bt_device_class_t* dc, uint8_t* data,
size_t len) {
CHECK(dc != NULL);
CHECK(data != NULL);
CHECK(len >= sizeof(bt_device_class_t));
for (size_t i = 0; i < sizeof(bt_device_class_t); ++i) {
data[i] = dc->_[i];
}
return sizeof(bt_device_class_t);
}
void device_class_from_int(bt_device_class_t* dc, int data) {
CHECK(dc != NULL);
CHECK(data != 0);
// Careful with endianess.
dc->_[0] = data & 0xff;
dc->_[1] = (data >> 8) & 0xff;
dc->_[2] = (data >> 16) & 0xff;
}
int device_class_to_int(const bt_device_class_t* dc) {
CHECK(dc != NULL);
// Careful with endianess.
int val = 0;
memcpy(&val, dc, sizeof(*dc));
return static_cast<int>(le32toh(val) & 0xffffff);
}
bool device_class_equals(const bt_device_class_t* p1,
const bt_device_class_t* p2) {
CHECK(p1 != NULL);
CHECK(p2 != NULL);
return (memcmp(p1, p2, sizeof(bt_device_class_t)) == 0);
}
bool device_class_copy(bt_device_class_t* dest, const bt_device_class_t* src) {
CHECK(dest != NULL);
CHECK(src != NULL);
return (memcpy(dest, src, sizeof(bt_device_class_t)) == dest);
}
int device_class_get_major_device(const bt_device_class_t* dc) {
CHECK(dc != NULL);
return DC(dc)->major_device;
}
void device_class_set_major_device(bt_device_class_t* dc, int val) {
CHECK(dc != NULL);
DC(dc)->major_device = val;
}
int device_class_get_minor_device(const bt_device_class_t* dc) {
CHECK(dc != NULL);
return DC(dc)->minor_device;
}
void device_class_set_minor_device(bt_device_class_t* dc, int val) {
CHECK(dc != NULL);
DC(dc)->minor_device = val;
}
bool device_class_get_information(const bt_device_class_t* dc) {
CHECK(dc != NULL);
return device_class_get_major_service_(dc, DC_INFORMATION);
}
void device_class_set_information(bt_device_class_t* dc, bool set) {
CHECK(dc != NULL);
if (set)
device_class_set_major_service_(dc, DC_INFORMATION);
else
device_class_clr_major_service_(dc, DC_INFORMATION);
}
bool device_class_get_limited(const bt_device_class_t* dc) {
CHECK(dc != NULL);
return device_class_get_major_service_(dc, DC_LIMITED_DISCOVERABLE_MODE);
}
void device_class_set_limited(bt_device_class_t* dc, bool set) {
CHECK(dc != NULL);
if (set)
device_class_set_major_service_(dc, DC_LIMITED_DISCOVERABLE_MODE);
else
device_class_clr_major_service_(dc, DC_LIMITED_DISCOVERABLE_MODE);
}
static bool device_class_get_major_service_(const bt_device_class_t* dc,
int bitmask) {
return (DC(dc)->major_service & bitmask);
}
static void device_class_clr_major_service_(bt_device_class_t* dc,
int bitmask) {
DC(dc)->major_service &= ~bitmask;
}
static void device_class_set_major_service_(bt_device_class_t* dc,
int bitmask) {
DC(dc)->major_service |= bitmask;
}
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