filehasher/base.h

#pragma once

#include <assert.h>
#include <immintrin.h>
#include <stdatomic.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#if defined(_WIN32) || defined(_WIN64)
#define PLATFORM_WINDOWS 1
#include <aclapi.h>
#include <fcntl.h>
#include <io.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <windows.h>

#define strdup _strdup
#else
#include <dirent.h>
#include <fcntl.h>
#include <pthread.h>
#include <pwd.h>
#include <sys/stat.h>
#include <unistd.h>
#endif

/* ------------------------------------------------------------
   Base types
   ------------------------------------------------------------ */

typedef uint8_t u8;
typedef uint16_t u16;
typedef uint32_t u32;
typedef uint64_t u64;
typedef int8_t i8;
typedef int16_t i16;
typedef int32_t i32;
typedef int64_t i64;

typedef i8 b8;
typedef int b32;

typedef float f32;
typedef double f64;

/* ------------------------------------------------------------
   Size helpers
   ------------------------------------------------------------ */

#define KiB(x) ((u64)(x) * 1024ULL)
#define MiB(x) (KiB(x) * 1024ULL)
#define GiB(x) (MiB(x) * 1024ULL)

/* ------------------------------------------------------------
   Min / Max helpers
   ------------------------------------------------------------ */

#ifndef MIN
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#endif

#ifndef MAX
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#endif

/* ------------------------------------------------------------
   Alignment helpers
   ------------------------------------------------------------ */

#define ALIGN_UP_POW2(x, a) ((a) ? (((x) + ((a) - 1)) & ~((a) - 1)) : (x))

/* ------------------------------------------------------------
   Assert
   ------------------------------------------------------------ */

#ifndef ASSERT
#define ASSERT(x) assert(x)
#endif

#define NDEBUG // Comment to enable asserts

/* ------------------------------------------------------------
   Some helper functions
   ------------------------------------------------------------ */

#if defined(_WIN32) || defined(_WIN64)

// Memory allocation

static u32 plat_get_pagesize(void) {
  SYSTEM_INFO sysinfo = {0};
  GetSystemInfo(&sysinfo);

  return sysinfo.dwPageSize;
}

static void *plat_mem_reserve(u64 size) {
  return VirtualAlloc(NULL, size, MEM_RESERVE, PAGE_READWRITE);
}

static b32 plat_mem_commit(void *ptr, u64 size) {
  void *ret = VirtualAlloc(ptr, size, MEM_COMMIT, PAGE_READWRITE);
  return ret != NULL;
}

static b32 plat_mem_decommit(void *ptr, u64 size) {
  return VirtualFree(ptr, size, MEM_DECOMMIT);
}

static b32 plat_mem_release(void *ptr, u64 size) {
  return VirtualFree(ptr, size, MEM_RELEASE);
}

// Semaphores
typedef struct plat_sem {
  HANDLE handle;
} plat_sem;

static b32 plat_sem_init(plat_sem *s, u32 initial) {
  s->handle = CreateSemaphore(NULL, initial, LONG_MAX, NULL);
  return s->handle != NULL;
}

static void plat_sem_wait(plat_sem *s) {
  WaitForSingleObject(s->handle, INFINITE);
}

static b32 plat_sem_trywait(HANDLE sem) {
  DWORD r = WaitForSingleObject(sem, 0);
  return r == WAIT_OBJECT_0;
}

static void plat_sem_post(plat_sem *s, u32 count) {
  ReleaseSemaphore(s->handle, count, NULL);
}

static void plat_sem_destroy(plat_sem *s) {
  if (s->handle) {
    CloseHandle(s->handle);
    s->handle = NULL;
  }
}

// Sleep
static void sleep_ms(int ms) { Sleep(ms); }

#elif defined(__linux__)

// Memory allocation

#ifndef _DEFAULT_SOURCE
#define _DEFAULT_SOURCE
#endif

#include <sys/mman.h>
#include <unistd.h>

static u32 plat_get_pagesize(void) { return (u32)sysconf(_SC_PAGESIZE); }

static void *plat_mem_reserve(u64 size) {
  void *out = mmap(NULL, size, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
  if (out == MAP_FAILED) {
    return NULL;
  }
  return out;
}

static b32 plat_mem_commit(void *ptr, u64 size) {
  i32 ret = mprotect(ptr, size, PROT_READ | PROT_WRITE);
  return ret == 0;
}

static b32 plat_mem_decommit(void *ptr, u64 size) {
  i32 ret = mprotect(ptr, size, PROT_NONE);
  if (ret != 0)
    return false;
  ret = madvise(ptr, size, MADV_DONTNEED);
  return ret == 0;
}

static b32 plat_mem_release(void *ptr, u64 size) {
  i32 ret = munmap(ptr, size);
  return ret == 0;
}

// Semaphores
#include <semaphore.h>

typedef struct plat_sem {
  sem_t sem;
} plat_sem;

static b32 plat_sem_init(plat_sem *s, u32 initial) {
  return sem_init(&s->sem, 0, initial) == 0;
}

static void plat_sem_wait(plat_sem *s) {
  while (sem_wait(&s->sem) == -1 && errno == EINTR) {
  }
}

static b32 plat_sem_trywait(sem_t *sem) { return sem_trywait(sem) == 0; }

static void plat_sem_post(plat_sem *s, u32 count) {
  for (u32 i = 0; i < count; i++) {
    sem_post(&s->sem);
  }
}

static void plat_sem_destroy(plat_sem *s) { sem_destroy(&s->sem); }

// Sleep
static void sleep_ms(int ms) { usleep(ms * 1000); }

#endif