+char *map_ptr(struct map_struct *map,off_t offset,int len)
+{
+ if (map->map)
+ return map->map+offset;
+
+ if (len == 0)
+ return NULL;
+
+ len = MIN(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);
+ len = MIN(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 (lseek(map->fd,offset,SEEK_SET) != offset ||
+ read(map->fd,map->p,len) != len) {
+ fprintf(FERROR,"EOF in map_ptr!\n");
+ exit_cleanup(1);
+ }
+
+ map->p_offset = offset;
+ map->p_len = len;
+
+ return map->p;
+}
+
+
+void unmap_file(struct map_struct *map)