-struct map_struct *map_file(int fd,OFF_T len)
-{
- struct map_struct *ret;
- ret = (struct map_struct *)malloc(sizeof(*ret));
- if (!ret) out_of_memory("map_file");
-
- ret->map = NULL;
- ret->fd = fd;
- ret->size = len;
- ret->p = NULL;
- ret->p_size = 0;
- ret->p_offset = 0;
- ret->p_len = 0;
-
-#ifdef HAVE_MMAP
- if (len < MAX_MAP_SIZE) {
- ret->map = (char *)mmap(NULL,len,PROT_READ,MAP_SHARED,fd,0);
- if (ret->map == (char *)-1) {
- ret->map = NULL;
- }
- }
-#endif
- return ret;
-}
-
-
-char *map_ptr(struct map_struct *map,OFF_T offset,int len)
-{
- int nread = -2;
-
- if (map->map)
- return map->map+offset;
-
- if (len == 0)
- return NULL;
-
- if (len > (map->size-offset))
- len = map->size-offset;
-
- if (offset >= map->p_offset &&
- offset+len <= map->p_offset+map->p_len) {
- return (map->p + (offset - map->p_offset));
- }
-
- len = MAX(len,CHUNK_SIZE);
- if (len > (map->size-offset))
- len = map->size-offset;
-
- if (len > map->p_size) {
- if (map->p) free(map->p);
- map->p = (char *)malloc(len);
- if (!map->p) out_of_memory("map_ptr");
- map->p_size = len;
- }
-
- if (do_lseek(map->fd,offset,SEEK_SET) != offset ||
- (nread=read(map->fd,map->p,len)) != len) {
- rprintf(FERROR,"EOF in map_ptr! (offset=%d len=%d nread=%d errno=%d)\n",
- (int)offset, len, nread, errno);
- exit_cleanup(1);
- }
-
- map->p_offset = offset;
- map->p_len = len;
-
- return map->p;
-}
-
-
-void unmap_file(struct map_struct *map)
-{
-#ifdef HAVE_MMAP
- if (map->map)
- munmap(map->map,map->size);
-#endif
- if (map->p) free(map->p);
- free(map);
-}
-