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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 <assert.h>
#include "buffer_allocator.h"
#include "bt_types.h"
#include "hcimsgs.h"
#include "hci_layer.h"
#include "hci_packet_parser.h"
static const command_opcode_t NO_OPCODE_CHECKING = 0;
static const allocator_t *buffer_allocator;
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 */);
buffer_allocator->free(response);
}
static void parse_read_buffer_size_response(
BT_HDR *response,
uint16_t *data_size_ptr,
uint16_t *acl_buffer_count_ptr) {
uint8_t *stream = read_command_complete_header(response, HCI_READ_BUFFER_SIZE, 5 /* bytes after */);
STREAM_TO_UINT16(*data_size_ptr, stream);
STREAM_SKIP_UINT8(stream); // skip the sco packet length
STREAM_TO_UINT16(*acl_buffer_count_ptr, stream);
buffer_allocator->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 */);
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);
buffer_allocator->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 */);
STREAM_TO_BDADDR(address_ptr->address, stream);
buffer_allocator->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 */);
STREAM_TO_ARRAY(supported_commands_ptr, stream, (int)supported_commands_length);
buffer_allocator->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 */);
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));
buffer_allocator->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 */);
STREAM_TO_UINT8(*white_list_size_ptr, stream);
buffer_allocator->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 */);
STREAM_TO_UINT16(*data_size_ptr, stream);
STREAM_TO_UINT8(*acl_buffer_count_ptr, stream);
buffer_allocator->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 */);
STREAM_TO_ARRAY(supported_states, stream, (int)supported_states_size);
buffer_allocator->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 */);
STREAM_TO_ARRAY(supported_features->as_array, stream, (int)sizeof(bt_device_features_t));
buffer_allocator->free(response);
}
// 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;
uint8_t parameter_length;
STREAM_TO_UINT8(event_code, stream);
STREAM_TO_UINT8(parameter_length, stream);
const size_t parameter_bytes_we_read_here = 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;
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);
// Make sure it was successful
assert(status == HCI_SUCCESS);
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_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
};
const hci_packet_parser_t *hci_packet_parser_get_interface() {
buffer_allocator = buffer_allocator_get_interface();
return &interface;
}
const hci_packet_parser_t *hci_packet_parser_get_test_interface(
allocator_t *buffer_allocator_interface) {
buffer_allocator = buffer_allocator_interface;
return &interface;
}
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