[client] project restructure part 1/2

client/include/utils.h

@@ -0,0 +1,99 @@
+/*
+Looking Glass - KVM FrameRelay (KVMFR) Client
+Copyright (C) 2017-2019 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);