#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <sys/mman.h>
#include <sys/stat.h>
int main(int argc,char**argv){
    char buf[64]; int fd=open(argv[1],O_RDONLY); struct stat st; fstat(fd,&st);
    printf("stat_size=%lld (inf_len 64-bit OK: %s)\n",(long long)st.st_size,
           st.st_size==5368696832LL?"yes":"NO");
    unsigned long long offs[]={0, 2048, 0xFFFFC000ULL, 0x100000000ULL};
    for(unsigned i=0;i<4;i++){
        errno=0; ssize_t r=pread(fd,buf,32,offs[i]);
        printf("pread@%#llx -> ret=%zd errno=%d buf0=%02x\n",offs[i],r,errno,
               r>0?(unsigned char)buf[0]:0);
    }
    void*p=mmap(NULL,4096,PROT_READ,MAP_SHARED,fd,0);
    printf("mmap@0 -> %s (v_object NULL => EINVAL, all UDF files)\n",
           p==MAP_FAILED?"FAIL/EINVAL":"OK");
    return 0;
}