misc.h

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#ifndef __H__MISC__
#define __H__MISC__
 
#include "defs.h"
#include "memory.h"
 
static void *read_binary_file(allocator_t allocator, const char *filename,
                              sz *size) {
  ASSERT__(filename);
  ASSERT__(size);
 
  // TODO: do error handling
  FILE *file = fopen(filename, "rb");
  fseek(file, 0, SEEK_END);
 
  *size = ftell(file);
  rewind(file);
 
  byte *buffer = allocator_alloc_ty(byte, allocator, *size);
  fread(buffer, sizeof(byte), *size, file);
  fclose(file);
 
  return buffer;
}
 
static char *read_text_file(allocator_t allocator, const char *filename) {
  ASSERT__(filename);
 
  // TODO: do error handling
  FILE *file = fopen(filename, "r");
  fseek(file, 0, SEEK_END);
 
  sz size = ftell(file);
  rewind(file);
 
  char *buffer = allocator_alloc_ty(char, allocator, size + 1);
  fread(buffer, sizeof(char), size, file);
  fclose(file);
  buffer[size] = '\0';
 
  return buffer;
}
 
static u64 hash_combine_u64(u64 seed, u64 value) {
  return seed ^ (value + 0x9e3779b97f4a7c15 + (seed << 6) + (seed >> 2));
}
 
// Commutative combinational hash
static u64 hash_combine_com_u64(u64 a, u64 b) {
  // Combine the hashes
  u64 o = hash_combine_u64(a, b) ^ hash_combine_u64(b, a);
  // Mix up the bits
  o ^= 0x9e3779b97f4a7c15 + (a << 6) + (a >> 2);
  // Implemented using only commutative operations, so should be
  // commutative
  return o;
}
 
#endif