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/******************************************************************************
*
* Copyright 2018 The Android Open Source Project
*
* 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 <bitset>
#include <string>
#include <vector>
#include "stack/rfcomm/rfc_int.h"
#include "stack_rfcomm_test_utils.h"
#include "stack_test_packet_utils.h"
namespace bluetooth {
namespace rfcomm {
uint8_t GetDlci(bool on_originator_side, uint8_t scn) {
return static_cast<uint8_t>((scn << 1) + (on_originator_side ? 1 : 0));
}
uint8_t GetAddressField(bool ea, bool cr, uint8_t dlci) {
std::bitset<8> address;
address.set(0, ea);
// For UIH frame, cr for initiating device is 1, otherwise 0
// Otherwise:
// Command: Initiator -> Responder: 1
// Command: Responder -> Initiator 0
// Response: Initiator -> Responder 0
// Response: Responder -> Initiator 1
// Initiator is defined by the one who send SABM=1 command
address.set(1, cr);
address |= dlci << 2;
return static_cast<uint8_t>(address.to_ulong());
}
uint8_t GetControlField(bool pf, uint8_t frame_type) {
std::bitset<8> control;
control |= frame_type;
control.set(4, pf);
return static_cast<uint8_t>(control.to_ulong());
}
uint8_t GetFrameTypeFromControlField(uint8_t control_field) {
return static_cast<uint8_t>(control_field & ~(0b10000));
}
std::vector<uint8_t> CreateMccPnFrame(uint8_t dlci, uint8_t i_bits,
uint8_t cl_bits, uint8_t priority,
uint8_t timer_value, uint16_t rfcomm_mtu,
uint8_t max_num_retransmission,
uint8_t err_recovery_window_k) {
// Data in little endian order
std::vector<uint8_t> result;
result.push_back(static_cast<uint8_t>(dlci & 0b00111111));
result.push_back(static_cast<uint8_t>((cl_bits << 4) | (i_bits & 0x0F)));
result.push_back(static_cast<uint8_t>(priority & 0b00111111));
result.push_back(timer_value);
result.push_back(static_cast<uint8_t>(rfcomm_mtu));
result.push_back(static_cast<uint8_t>(rfcomm_mtu >> 8));
result.push_back(max_num_retransmission);
result.push_back(static_cast<uint8_t>(err_recovery_window_k & 0b111));
return result;
}
std::vector<uint8_t> CreateMccMscFrame(uint8_t dlci, bool fc, bool rtc,
bool rtr, bool ic, bool dv) {
// Data in little endian order
std::vector<uint8_t> result;
result.push_back(static_cast<uint8_t>((dlci << 2) | 0b11));
std::bitset<8> v24_signals;
// EA = 1, single byte
v24_signals.set(0, true);
v24_signals.set(1, fc);
v24_signals.set(2, rtc);
v24_signals.set(3, rtr);
v24_signals.set(6, ic);
v24_signals.set(7, dv);
result.push_back(static_cast<uint8_t>(v24_signals.to_ulong()));
return result;
}
std::vector<uint8_t> CreateMultiplexerControlFrame(
uint8_t command_type, bool cr, const std::vector<uint8_t>& data) {
// Data in little endian order
std::vector<uint8_t> result;
std::bitset<8> header;
header.set(0, true); // EA is always 1
header.set(1, cr);
header |= command_type << 2;
result.push_back(static_cast<uint8_t>(header.to_ulong()));
// 7 bit length + EA(1)
result.push_back(static_cast<uint8_t>((data.size() << 1) + 1));
result.insert(result.end(), data.begin(), data.end());
return result;
}
std::vector<uint8_t> CreateRfcommPacket(uint8_t address, uint8_t control,
int credits,
const std::vector<uint8_t>& data) {
// Data in little endian order
std::vector<uint8_t> result;
result.push_back(address);
result.push_back(control);
size_t length = data.size();
if ((length & 0b1000000) != 0) {
// 15 bits of length in little endian order + EA(0)
// Lower 7 bits + EA(0)
result.push_back(static_cast<uint8_t>(length) << 1);
// Upper 8 bits
result.push_back(static_cast<uint8_t>(length >> 8));
} else {
// 7 bits of length + EA(1)
result.push_back(static_cast<uint8_t>((length << 1) + 1));
}
if (credits > 0) {
result.push_back(static_cast<uint8_t>(credits));
}
result.insert(result.end(), data.begin(), data.end());
if (GetFrameTypeFromControlField(control) == RFCOMM_UIH) {
result.push_back(rfc_calc_fcs(2, result.data()));
} else {
result.push_back(
rfc_calc_fcs(static_cast<uint16_t>(result.size()), result.data()));
}
return result;
}
std::vector<uint8_t> CreateQuickUaPacket(uint8_t dlci, uint16_t l2cap_lcid,
uint16_t acl_handle) {
uint8_t address_field = GetAddressField(true, true, dlci);
uint8_t control_field = GetControlField(true, RFCOMM_UA);
std::vector<uint8_t> rfcomm_packet =
CreateRfcommPacket(address_field, control_field, -1, {});
std::vector<uint8_t> l2cap_packet =
CreateL2capDataPacket(l2cap_lcid, rfcomm_packet);
return CreateAclPacket(acl_handle, 0b10, 0b00, l2cap_packet);
}
std::vector<uint8_t> CreateQuickSabmPacket(uint8_t dlci, uint16_t l2cap_lcid,
uint16_t acl_handle) {
uint8_t address_field = GetAddressField(true, true, dlci);
uint8_t control_field = GetControlField(true, RFCOMM_SABME);
std::vector<uint8_t> rfcomm_packet =
CreateRfcommPacket(address_field, control_field, -1, {});
std::vector<uint8_t> l2cap_packet =
CreateL2capDataPacket(l2cap_lcid, rfcomm_packet);
return CreateAclPacket(acl_handle, 0b10, 0b00, l2cap_packet);
}
std::vector<uint8_t> CreateQuickPnPacket(bool rfc_cr, uint8_t target_dlci,
bool mx_cr, uint16_t rfc_mtu,
uint8_t cl, uint8_t priority,
uint8_t k, uint16_t l2cap_lcid,
uint16_t acl_handle) {
uint8_t address_field = GetAddressField(true, rfc_cr, RFCOMM_MX_DLCI);
uint8_t control_field = GetControlField(false, RFCOMM_UIH);
std::vector<uint8_t> mcc_pn_data = CreateMccPnFrame(
target_dlci, 0x0, cl, priority, RFCOMM_T1_DSEC, rfc_mtu, RFCOMM_N2, k);
std::vector<uint8_t> mcc_payload =
CreateMultiplexerControlFrame(0x20, mx_cr, mcc_pn_data);
std::vector<uint8_t> rfcomm_packet =
CreateRfcommPacket(address_field, control_field, -1, mcc_payload);
std::vector<uint8_t> l2cap_packet =
CreateL2capDataPacket(l2cap_lcid, rfcomm_packet);
return CreateAclPacket(acl_handle, 0b10, 0b00, l2cap_packet);
}
std::vector<uint8_t> CreateQuickMscPacket(bool rfc_cr, uint8_t dlci,
uint16_t l2cap_lcid,
uint16_t acl_handle, bool mx_cr,
bool fc, bool rtc, bool rtr, bool ic,
bool dv) {
uint8_t address_field = GetAddressField(true, rfc_cr, RFCOMM_MX_DLCI);
uint8_t control_field = GetControlField(false, RFCOMM_UIH);
std::vector<uint8_t> mcc_msc_data =
CreateMccMscFrame(dlci, fc, rtc, rtr, ic, dv);
std::vector<uint8_t> mcc_payload =
CreateMultiplexerControlFrame(0x38, mx_cr, mcc_msc_data);
std::vector<uint8_t> rfcomm_packet =
CreateRfcommPacket(address_field, control_field, -1, mcc_payload);
std::vector<uint8_t> l2cap_packet =
CreateL2capDataPacket(l2cap_lcid, rfcomm_packet);
return CreateAclPacket(acl_handle, 0b10, 0b00, l2cap_packet);
}
std::vector<uint8_t> CreateQuickDataPacket(uint8_t dlci, bool cr,
uint16_t l2cap_lcid,
uint16_t acl_handle, int credits,
const std::vector<uint8_t>& data) {
uint8_t address_field = GetAddressField(true, cr, dlci);
uint8_t control_field =
GetControlField(credits > 0 ? true : false, RFCOMM_UIH);
std::vector<uint8_t> rfcomm_packet =
CreateRfcommPacket(address_field, control_field, credits, data);
std::vector<uint8_t> l2cap_packet =
CreateL2capDataPacket(l2cap_lcid, rfcomm_packet);
return CreateAclPacket(acl_handle, 0b10, 0b00, l2cap_packet);
}
std::vector<uint8_t> CreateQuickDataPacket(uint8_t dlci, bool cr,
uint16_t l2cap_lcid,
uint16_t acl_handle, int credits,
const std::string& str) {
std::vector<uint8_t> data(str.begin(), str.end());
return CreateQuickDataPacket(dlci, cr, l2cap_lcid, acl_handle, credits, data);
}
} // namespace rfcomm
} // namespace bluetooth
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