#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/mman.h>

#include "fileread.h"

st_mmap_t createSt_mmap(char* filename,int &fd) {
    st_mmap_t st_mmap;
    int map = MAP_PRIVATE;
    struct stat sb;
    if ((fd=open(filename,O_RDONLY,0666))==0) {
        perror("");
        fprintf(stderr,"can't open %s\n",filename);
    }

    if (fstat(fd,&sb)) {
        perror("");
        fprintf(stderr,"can't fstat %s\n",filename);
    }
    st_mmap.size = sb.st_size;
    unsigned char *file_mmap = (unsigned char*)mmap(NULL,st_mmap.size,PROT_WRITE|PROT_READ,map,fd,(off_t)0);
    if (file_mmap == NULL) {
        perror("");
        fprintf(stderr,"cannot mmap %s\n",filename);
    }
    st_mmap.file_mmap = file_mmap;
    return st_mmap;
}

Buffer createBuffer(st_mmap_t st_mmap) {
    Buffer buff;
    buff.buff = buff.buffptr = st_mmap.file_mmap;
    buff.buffend = buff.buff + st_mmap.size;
    return buff;
}