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/******************************************************************************
*
* Copyright (C) 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 "common/bt_defs.h"
#include "stack/bt_types.h"
#include "stack/hcimsgs.h"
#include "hci/hci_layer.h"
#include "hci/hci_packet_parser.h"
static const command_opcode_t NO_OPCODE_CHECKING = 0;
static uint8_t *read_command_complete_header(
BT_HDR *response,
command_opcode_t expected_opcode,
size_t minimum_bytes_after);
static void parse_generic_command_complete(BT_HDR *response)
{
read_command_complete_header(response, NO_OPCODE_CHECKING, 0 /* bytes after */);
osi_free(response);
}
static void parse_read_buffer_size_response(
BT_HDR *response,
uint16_t *acl_data_size_ptr,
uint16_t *acl_buffer_count_ptr,
uint8_t *sco_data_size_ptr,
uint16_t *sco_buffer_count_ptr)
{
uint8_t *stream = read_command_complete_header(response, HCI_READ_BUFFER_SIZE, 7 /* bytes after */);
assert(stream != NULL);
STREAM_TO_UINT16(*acl_data_size_ptr, stream);
STREAM_TO_UINT8(*sco_data_size_ptr, stream);
STREAM_TO_UINT16(*acl_buffer_count_ptr, stream);
STREAM_TO_UINT16(*sco_buffer_count_ptr, stream);
osi_free(response);
}
static void parse_read_local_version_info_response(
BT_HDR *response,
bt_version_t *bt_version)
{
uint8_t *stream = read_command_complete_header(response, HCI_READ_LOCAL_VERSION_INFO, 8 /* bytes after */);
assert(stream != NULL);
STREAM_TO_UINT8(bt_version->hci_version, stream);
STREAM_TO_UINT16(bt_version->hci_revision, stream);
STREAM_TO_UINT8(bt_version->lmp_version, stream);
STREAM_TO_UINT16(bt_version->manufacturer, stream);
STREAM_TO_UINT16(bt_version->lmp_subversion, stream);
osi_free(response);
}
static void parse_read_bd_addr_response(
BT_HDR *response,
bt_bdaddr_t *address_ptr)
{
uint8_t *stream = read_command_complete_header(response, HCI_READ_BD_ADDR, sizeof(bt_bdaddr_t) /* bytes after */);
assert(stream != NULL);
STREAM_TO_BDADDR(address_ptr->address, stream);
osi_free(response);
}
static void parse_read_local_supported_commands_response(
BT_HDR *response,
uint8_t *supported_commands_ptr,
size_t supported_commands_length)
{
uint8_t *stream = read_command_complete_header(response, HCI_READ_LOCAL_SUPPORTED_CMDS, supported_commands_length /* bytes after */);
assert(stream != NULL);
STREAM_TO_ARRAY(supported_commands_ptr, stream, (int)supported_commands_length);
osi_free(response);
}
static void parse_read_local_supported_features_response(
BT_HDR *response,
bt_device_features_t *feature_pages)
{
uint8_t *stream = read_command_complete_header(response, HCI_READ_LOCAL_FEATURES, sizeof(bt_device_features_t) /* bytes after */);
if (stream != NULL) {
STREAM_TO_ARRAY(feature_pages->as_array, stream, (int)sizeof(bt_device_features_t));
}
osi_free(response);
}
static void parse_read_local_extended_features_response(
BT_HDR *response,
uint8_t *page_number_ptr,
uint8_t *max_page_number_ptr,
bt_device_features_t *feature_pages,
size_t feature_pages_count)
{
uint8_t *stream = read_command_complete_header(response, HCI_READ_LOCAL_EXT_FEATURES, 2 + sizeof(bt_device_features_t) /* bytes after */);
if (stream != NULL) {
STREAM_TO_UINT8(*page_number_ptr, stream);
STREAM_TO_UINT8(*max_page_number_ptr, stream);
assert(*page_number_ptr < feature_pages_count);
STREAM_TO_ARRAY(feature_pages[*page_number_ptr].as_array, stream, (int)sizeof(bt_device_features_t));
} else {
HCI_TRACE_ERROR("%s() - WARNING: READING EXTENDED FEATURES FAILED. "
"THIS MAY INDICATE A FIRMWARE/CONTROLLER ISSUE.", __func__);
}
osi_free(response);
}
static void parse_ble_read_white_list_size_response(
BT_HDR *response,
uint8_t *white_list_size_ptr)
{
uint8_t *stream = read_command_complete_header(response, HCI_BLE_READ_WHITE_LIST_SIZE, 1 /* byte after */);
assert(stream != NULL);
STREAM_TO_UINT8(*white_list_size_ptr, stream);
osi_free(response);
}
static void parse_ble_read_buffer_size_response(
BT_HDR *response,
uint16_t *data_size_ptr,
uint8_t *acl_buffer_count_ptr)
{
uint8_t *stream = read_command_complete_header(response, HCI_BLE_READ_BUFFER_SIZE, 3 /* bytes after */);
assert(stream != NULL);
STREAM_TO_UINT16(*data_size_ptr, stream);
STREAM_TO_UINT8(*acl_buffer_count_ptr, stream);
osi_free(response);
}
static void parse_ble_read_supported_states_response(
BT_HDR *response,
uint8_t *supported_states,
size_t supported_states_size)
{
uint8_t *stream = read_command_complete_header(response, HCI_BLE_READ_SUPPORTED_STATES, supported_states_size /* bytes after */);
assert(stream != NULL);
STREAM_TO_ARRAY(supported_states, stream, (int)supported_states_size);
osi_free(response);
}
static void parse_ble_read_local_supported_features_response(
BT_HDR *response,
bt_device_features_t *supported_features)
{
uint8_t *stream = read_command_complete_header(response, HCI_BLE_READ_LOCAL_SPT_FEAT, sizeof(bt_device_features_t) /* bytes after */);
assert(stream != NULL);
STREAM_TO_ARRAY(supported_features->as_array, stream, (int)sizeof(bt_device_features_t));
osi_free(response);
}
static void parse_ble_read_resolving_list_size_response(
BT_HDR *response,
uint8_t *resolving_list_size_ptr)
{
uint8_t *stream = read_command_complete_header(response, HCI_BLE_READ_RESOLVING_LIST_SIZE, 1 /* bytes after */);
if (stream) {
STREAM_TO_UINT8(*resolving_list_size_ptr, stream);
}
osi_free(response);
}
static void parse_ble_read_suggested_default_data_length_response(
BT_HDR *response,
uint16_t *ble_default_packet_length_ptr,
uint16_t *ble_default_packet_txtime_ptr)
{
uint8_t *stream = read_command_complete_header(response, HCI_BLE_READ_DEFAULT_DATA_LENGTH, 2 /* bytes after */);
if (stream) {
STREAM_TO_UINT16(*ble_default_packet_length_ptr, stream);
STREAM_TO_UINT16(*ble_default_packet_txtime_ptr, stream);
}
osi_free(response);
}
#if (BLE_50_FEATURE_SUPPORT == TRUE)
static void parse_ble_read_adv_max_len_response(
BT_HDR *response,
uint16_t *adv_max_len_ptr)
{
uint8_t *stream = read_command_complete_header(response, HCI_BLE_RD_MAX_ADV_DATA_LEN, 1 /* bytes after */);
if (stream) {
// Size: 2 Octets ; Value: 0x001F – 0x0672 ; Maximum supported advertising data length
STREAM_TO_UINT16(*adv_max_len_ptr, stream);
}
osi_free(response);
}
#endif // #if (BLE_50_FEATURE_SUPPORT == TRUE)
// Internal functions
static uint8_t *read_command_complete_header(
BT_HDR *response,
command_opcode_t expected_opcode,
size_t minimum_bytes_after)
{
uint8_t *stream = response->data + response->offset;
// Read the event header
uint8_t event_code __attribute__((unused));
uint8_t parameter_length __attribute__((unused));
STREAM_TO_UINT8(event_code, stream);
STREAM_TO_UINT8(parameter_length, stream);
const size_t parameter_bytes_we_read_here __attribute__((unused)) = 4;
// Check the event header values against what we expect
assert(event_code == HCI_COMMAND_COMPLETE_EVT);
assert(parameter_length >= (parameter_bytes_we_read_here + minimum_bytes_after));
// Read the command complete header
command_opcode_t opcode __attribute__((unused));
uint8_t status;
STREAM_SKIP_UINT8(stream); // skip the number of hci command packets field
STREAM_TO_UINT16(opcode, stream);
// Check the command complete header values against what we expect
if (expected_opcode != NO_OPCODE_CHECKING) {
assert(opcode == expected_opcode);
}
// Assume the next field is the status field
STREAM_TO_UINT8(status, stream);
if (status != HCI_SUCCESS) {
HCI_TRACE_ERROR("%s failed: opcode 0x%04x, status 0x%02x", __func__, opcode, status);
return NULL;
}
return stream;
}
static const hci_packet_parser_t interface = {
parse_generic_command_complete,
parse_read_buffer_size_response,
parse_read_local_version_info_response,
parse_read_bd_addr_response,
parse_read_local_supported_commands_response,
parse_read_local_supported_features_response,
parse_read_local_extended_features_response,
parse_ble_read_white_list_size_response,
parse_ble_read_buffer_size_response,
parse_ble_read_supported_states_response,
parse_ble_read_local_supported_features_response,
parse_ble_read_resolving_list_size_response,
#if (BLE_50_FEATURE_SUPPORT == TRUE)
parse_ble_read_adv_max_len_response,
#endif // #if (BLE_50_FEATURE_SUPPORT == TRUE)
parse_ble_read_suggested_default_data_length_response
};
const hci_packet_parser_t *hci_packet_parser_get_interface(void)
{
return &interface;
}
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