mirror of
https://github.com/gnif/LookingGlass.git
synced 2024-11-22 13:37:22 +00:00
99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
/*
|
|
Looking Glass - KVM FrameRelay (KVMFR) Client
|
|
Copyright (C) 2017 Geoffrey McRae <geoff@hostfission.com>
|
|
https://looking-glass.hostfission.com
|
|
|
|
This program is free software; you can redistribute it and/or modify it under
|
|
the terms of the GNU General Public License as published by the Free Software
|
|
Foundation; either version 2 of the License, or (at your option) any later
|
|
version.
|
|
|
|
This program is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
|
|
PARTICULAR PURPOSE. See the GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License along with
|
|
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
|
|
Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <time.h>
|
|
#include <stdint.h>
|
|
#include <stdbool.h>
|
|
|
|
static inline uint64_t microtime()
|
|
{
|
|
struct timespec time;
|
|
clock_gettime(CLOCK_MONOTONIC_RAW, &time);
|
|
return ((uint64_t)time.tv_sec * 1000000) + (time.tv_nsec / 1000);
|
|
}
|
|
|
|
static inline uint64_t nanotime()
|
|
{
|
|
struct timespec time;
|
|
clock_gettime(CLOCK_MONOTONIC_RAW, &time);
|
|
return ((uint64_t)time.tv_sec * 1e9) + time.tv_nsec;
|
|
}
|
|
|
|
static inline void nsleep(uint64_t ns)
|
|
{
|
|
const struct timespec ts =
|
|
{
|
|
.tv_sec = ns / 1e9,
|
|
.tv_nsec = ns - ((ns / 1e9) * 1e9)
|
|
};
|
|
nanosleep(&ts, NULL);
|
|
}
|
|
|
|
#ifdef ATOMIC_LOCKING
|
|
#define LG_LOCK_MODE "Atomic"
|
|
typedef volatile int LG_Lock;
|
|
#define LG_LOCK_INIT(x) (x) = 0
|
|
#define LG_LOCK(x) while(__sync_lock_test_and_set(&(x), 1)) {nsleep(100);}
|
|
#define LG_UNLOCK(x) __sync_lock_release(&x)
|
|
#define LG_LOCK_FREE(x)
|
|
#else
|
|
#include <SDL2/SDL.h>
|
|
#define LG_LOCK_MODE "Mutex"
|
|
typedef SDL_mutex * LG_Lock;
|
|
#define LG_LOCK_INIT(x) (x = SDL_CreateMutex())
|
|
#define LG_LOCK(x) SDL_LockMutex(x)
|
|
#define LG_UNLOCK(x) SDL_UnlockMutex(x)
|
|
#define LG_LOCK_FREE(x) SDL_DestroyMutex(x)
|
|
#endif
|
|
|
|
static inline uint32_t get_bit(const uint8_t * const base, size_t * const offset)
|
|
{
|
|
uint32_t out = ((*(base + (*offset >> 0x3))) >> (0x7 - (*offset & 0x7))) & 0x1;
|
|
++*offset;
|
|
return out;
|
|
}
|
|
|
|
static inline uint32_t get_bits(const uint8_t * const base, size_t * const offset, const uint8_t bits)
|
|
{
|
|
uint32_t value = 0;
|
|
for (int i = 0; i < bits; ++i)
|
|
value |= (get_bit(base, offset) ? 1 : 0) << (bits - i - 1);
|
|
return value;
|
|
}
|
|
|
|
static inline uint32_t decode_u_golomb(const uint8_t * const base, size_t * const offset)
|
|
{
|
|
uint32_t i = 0;
|
|
while(get_bit(base, offset) == 0)
|
|
++i;
|
|
|
|
return ((1 << i) - 1 + get_bits(base, offset, i));
|
|
}
|
|
|
|
static inline int32_t decode_s_golomb(const uint8_t * const base, size_t * const offset)
|
|
{
|
|
const uint32_t g = decode_u_golomb(base, offset);
|
|
return (g & 0x1) ? (g + 1) / 2 : -(g / 2);
|
|
}
|
|
|
|
// reads the specified file into a new buffer
|
|
// the callee must free the buffer
|
|
bool file_get_contents(const char * filename, char ** buffer, size_t * length); |