You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
42 lines
1.0 KiB
C
42 lines
1.0 KiB
C
#include <sys/types.h>
|
|
#ifdef _WIN32
|
|
#include <windows.h>
|
|
#else
|
|
#include <unistd.h>
|
|
#include <sys/mman.h>
|
|
#include "open.h"
|
|
#endif
|
|
#include "mmap.h"
|
|
|
|
char* mmap_private(const char* filename,size_t * filesize) {
|
|
#ifdef _WIN32
|
|
HANDLE fd,m;
|
|
char* map;
|
|
fd=CreateFile(filename,GENERIC_READ,FILE_SHARE_READ|FILE_SHARE_WRITE|FILE_SHARE_DELETE,0,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,0);
|
|
if (fd==INVALID_HANDLE_VALUE)
|
|
return 0;
|
|
m=CreateFileMapping(fd,0,PAGE_WRITECOPY,0,0,NULL);
|
|
map=0;
|
|
if (m)
|
|
if ((map=MapViewOfFile(m,FILE_MAP_COPY,0,0,0)))
|
|
*filesize=GetFileSize(fd,NULL);
|
|
CloseHandle(m);
|
|
CloseHandle(fd);
|
|
return map;
|
|
#else
|
|
int fd=open_read(filename);
|
|
char *map;
|
|
if (fd>=0) {
|
|
register off_t o=lseek(fd,0,SEEK_END);
|
|
if (o==0 || (sizeof(off_t)!=sizeof(size_t) && o > (off_t)(size_t)-1)) { close(fd); return 0; }
|
|
*filesize=(size_t)o;
|
|
map=(char*)mmap(0,*filesize,PROT_READ|PROT_WRITE,MAP_PRIVATE,fd,0);
|
|
if (map==(char*)-1)
|
|
map=0;
|
|
close(fd);
|
|
return map;
|
|
}
|
|
return 0;
|
|
#endif
|
|
}
|