mirror of
https://github.com/gnif/LookingGlass.git
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99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
/*
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Looking Glass - KVM FrameRelay (KVMFR) Client
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Copyright (C) 2017-2019 Geoffrey McRae <geoff@hostfission.com>
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https://looking-glass.hostfission.com
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#pragma once
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#include <time.h>
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#include <stdint.h>
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#include <stdbool.h>
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static inline uint64_t microtime()
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{
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struct timespec time;
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clock_gettime(CLOCK_MONOTONIC_RAW, &time);
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return ((uint64_t)time.tv_sec * 1000000) + (time.tv_nsec / 1000);
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}
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static inline uint64_t nanotime()
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{
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struct timespec time;
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clock_gettime(CLOCK_MONOTONIC_RAW, &time);
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return ((uint64_t)time.tv_sec * 1e9) + time.tv_nsec;
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}
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static inline void nsleep(uint64_t ns)
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{
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const struct timespec ts =
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{
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.tv_sec = ns / 1e9,
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.tv_nsec = ns - ((ns / 1e9) * 1e9)
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};
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nanosleep(&ts, NULL);
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}
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#ifdef ATOMIC_LOCKING
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#define LG_LOCK_MODE "Atomic"
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typedef volatile int LG_Lock;
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#define LG_LOCK_INIT(x) (x) = 0
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#define LG_LOCK(x) while(__sync_lock_test_and_set(&(x), 1)) {nsleep(100);}
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#define LG_UNLOCK(x) __sync_lock_release(&x)
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#define LG_LOCK_FREE(x)
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#else
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#include <SDL2/SDL.h>
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#define LG_LOCK_MODE "Mutex"
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typedef SDL_mutex * LG_Lock;
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#define LG_LOCK_INIT(x) (x = SDL_CreateMutex())
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#define LG_LOCK(x) SDL_LockMutex(x)
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#define LG_UNLOCK(x) SDL_UnlockMutex(x)
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#define LG_LOCK_FREE(x) SDL_DestroyMutex(x)
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#endif
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static inline uint32_t get_bit(const uint8_t * const base, size_t * const offset)
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{
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uint32_t out = ((*(base + (*offset >> 0x3))) >> (0x7 - (*offset & 0x7))) & 0x1;
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++*offset;
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return out;
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}
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static inline uint32_t get_bits(const uint8_t * const base, size_t * const offset, const uint8_t bits)
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{
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uint32_t value = 0;
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for (int i = 0; i < bits; ++i)
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value |= (get_bit(base, offset) ? 1 : 0) << (bits - i - 1);
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return value;
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}
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static inline uint32_t decode_u_golomb(const uint8_t * const base, size_t * const offset)
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{
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uint32_t i = 0;
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while(get_bit(base, offset) == 0)
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++i;
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return ((1 << i) - 1 + get_bits(base, offset, i));
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}
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static inline int32_t decode_s_golomb(const uint8_t * const base, size_t * const offset)
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{
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const uint32_t g = decode_u_golomb(base, offset);
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return (g & 0x1) ? (g + 1) / 2 : -(g / 2);
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}
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// reads the specified file into a new buffer
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// the callee must free the buffer
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bool file_get_contents(const char * filename, char ** buffer, size_t * length); |