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/*
* Author: Sven Gothel <sgothel@jausoft.com>
* Copyright (c) 2020 Gothel Software e.K.
* Copyright (c) 2020 ZAFENA AB
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "HCIUtil.hpp"
// #define _USE_BACKTRACE_ 1
#if _USE_BACKTRACE_
extern "C" {
#include <execinfo.h>
}
#endif
using namespace tinyb_hci;
static const int64_t NanoPerMilli = 1000000L;
static const int64_t MilliPerOne = 1000L;
/**
* See <http://man7.org/linux/man-pages/man2/clock_gettime.2.html>
* <p>
* Regarding avoiding kernel via VDSO,
* see <http://man7.org/linux/man-pages/man7/vdso.7.html>,
* clock_gettime seems to be well supported at least on kernel >= 4.4.
* Only bfin and sh are missing, while ia64 seems to be complicated.
*/
int64_t tinyb_hci::getCurrentMilliseconds() {
struct timespec t;
clock_gettime(CLOCK_MONOTONIC, &t);
return t.tv_sec * MilliPerOne + t.tv_nsec / NanoPerMilli;
}
const char* RuntimeException::what() const noexcept {
#if _USE_BACKTRACE_
std::string out(msg);
void *buffers[10];
size_t nptrs = backtrace(buffers, 10);
char **symbols = backtrace_symbols(buffers, nptrs);
if( NULL != symbols ) {
out.append("\nBacktrace:\n");
for(int i=0; i<nptrs; i++) {
out.append(symbols[i]).append("\n");
}
free(symbols);
}
return out.c_str();
#else
return msg.c_str();
#endif
}
uint128_t tinyb_hci::merge_uint128(uint128_t const & base_uuid, uint16_t const uuid16, int const uuid16_le_octet_index)
{
if( 0 > uuid16_le_octet_index || uuid16_le_octet_index > 14 ) {
std::string msg("uuid16_le_octet_index ");
msg.append(std::to_string(uuid16_le_octet_index));
msg.append(", not within [0..14]");
throw IllegalArgumentException(msg);
}
uint128_t dest = base_uuid;
// base_uuid: 00000000-0000-1000-8000-00805F9B34FB
// uuid16: DCBA
// uuid16_le_octet_index: 12
// result: 0000DCBA-0000-1000-8000-00805F9B34FB
//
// LE: low-mem - FB349B5F8000-0080-0010-0000-ABCD0000 - high-mem
// ^ index 12
// LE: uuid16 -> value.data[12+13]
//
// BE: low-mem - 0000DCBA-0000-1000-8000-00805F9B34FB - high-mem
// ^ index 2
// BE: uuid16 -> value.data[2+3]
//
#if __BYTE_ORDER == __BIG_ENDIAN
int offset = 15 - 1 - uuid16_le_octet_index;
#elif __BYTE_ORDER == __LITTLE_ENDIAN
int offset = uuid16_le_octet_index;
#else
#error "Unexpected __BYTE_ORDER"
#endif
uint16_t * destu16 = (uint16_t*)(dest.data + offset);
*destu16 += uuid16;
return dest;
}
uint128_t tinyb_hci::merge_uint128(uint128_t const & base_uuid, uint32_t const uuid32, int const uuid32_le_octet_index)
{
if( 0 > uuid32_le_octet_index || uuid32_le_octet_index > 12 ) {
std::string msg("uuid32_le_octet_index ");
msg.append(std::to_string(uuid32_le_octet_index));
msg.append(", not within [0..12]");
throw IllegalArgumentException(msg);
}
uint128_t dest = base_uuid;
// base_uuid: 00000000-0000-1000-8000-00805F9B34FB
// uuid32: 87654321
// uuid32_le_octet_index: 12
// result: 87654321-0000-1000-8000-00805F9B34FB
//
// LE: low-mem - FB349B5F8000-0080-0010-0000-12345678 - high-mem
// ^ index 12
// LE: uuid32 -> value.data[12..15]
//
// BE: low-mem - 87654321-0000-1000-8000-00805F9B34FB - high-mem
// ^ index 0
// BE: uuid32 -> value.data[0..3]
//
#if __BYTE_ORDER == __BIG_ENDIAN
int offset = 15 - 3 - uuid32_le_octet_index;
#elif __BYTE_ORDER == __LITTLE_ENDIAN
int offset = uuid32_le_octet_index;
#else
#error "Unexpected __BYTE_ORDER"
#endif
uint32_t * destu32 = (uint32_t*)(dest.data + offset);
*destu32 += uuid32;
return dest;
}
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