Function MappedFileRead

roomedit/source/dibutil.cpp:349–357

/ * MappedFileRead: Copy num bytes from the memory-mapped file to buf. * Increments the file pointer. * Returns num on success, or -1 on failure. */

 *   Returns num on success, or -1 on failure.
 */
int MappedFileRead(file_node *f, void *buf, int num)
{
   if ((f->ptr - f->mem) + num > f->length || f->ptr < f->mem || num <= 0)
      return -1;
      
   memcpy(buf, f->ptr, num);
   f->ptr += num;
   return num;
}
/***************************************************************************/
Bool MappedFileClose(file_node *f)
{