clpi.cpp

#include <stdio.h>

#define bread(buffer) fread(&buffer, sizeof(buffer), 1, fp)

int to_i(unsigned char* data) {
  return (data[3]<<0) | (data[2]<<8) | (data[1]<<16) | (data[0]<<24);
}

int main() {
  char* source = "00012.clpi";
  FILE * fp = fopen(source, "r");

  unsigned char buffer[4];
  bread(buffer);
  int id = to_i(buffer);
  if (id != 0x48444d56)
    return -1;
  fseek(fp, 4, SEEK_CUR);

  const int n = 8;
  int offsets[n];

  for (int i = 0; i < n; i++)
  {
    bread(buffer);
    offsets[i] = to_i(buffer);
  }
  int intime = 0, length = 0;
  for (int i = 0; i < n-1; i++)
  {
    if (offsets[i+1] - offsets[i] == 0x1A)
    {
      fseek(fp, offsets[i] + 0x12, SEEK_SET);
      bread(buffer);
      intime = to_i(buffer);
      bread(buffer);
      length = to_i(buffer);
      break;
    }
  }
  printf("intime: %d, length: %d\n", intime, length);
  return 0;
}