}/* mem_undiff */
/*
* restore_undo
*
* This function does the dirty work for z_restore_undo.
*
*/
internal static int restore_undo()
{
if (main.option_undo_slots == 0) /* undo feature unavailable */
{
return(-1);
}
if (undo_mem.Count == 0)
{
return(0);
}
/* undo possible */
undo_struct undo = undo_mem[undo_mem.Count - 1];
System.Array.Copy(prev_zmp, ZMData, main.h_dynamic_size);
SET_PC(undo.pc);
main.sp = undo.sp;
main.fp = undo.frame_offset;
main.frame_count = undo.frame_count;
mem_undiff(undo.undo_data, undo.diff_size, prev_zmp);
// System.Array.Copy(undo.stack, 0, main.stack, undo.sp, undo.stack.Length);
Frotz.Other.ArrayCopy.Copy(undo.stack, 0, main.stack, undo.sp, undo.stack.Length);
undo_mem.Remove(undo);
restart_header();
return(2);
}/* restore_undo */
}/* z_save */
/*
* save_undo
*
* This function does the dirty work for z_save_undo.
*
*/
internal static int save_undo()
{
long diff_size;
int stack_size;
undo_struct p;
if (main.option_undo_slots == 0) /* undo feature unavailable */
{
return(-1);
}
/* save undo possible */
if (undo_count == main.option_undo_slots)
{
free_undo(1);
}
p = new undo_struct();
diff_size = mem_diff(ZMData, prev_zmp, main.h_dynamic_size, undo_diff);
stack_size = main.stack.Length;
GET_PC(out p.pc);
p.frame_count = main.frame_count;
p.diff_size = diff_size;
p.stack_size = (zword)stack_size;
p.frame_offset = (zword)main.fp; // p->frame_offset = fp - stack;
// p.undo_data = undo_diff;
p.undo_data = new zbyte[diff_size];
// System.Array.Copy(undo_diff, p.undo_data, diff_size);
Frotz.Other.ArrayCopy.Copy(undo_diff, 0, p.undo_data, 0, diff_size);
p.stack = new zword[main.stack.Length - main.sp];
// System.Array.Copy(main.stack, main.sp, p.stack, 0, main.stack.Length - main.sp);
Frotz.Other.ArrayCopy.Copy(main.stack, main.sp, p.stack, 0, main.stack.Length - main.sp);
p.sp = main.sp;
undo_mem.Add(p);
return(1);
}/* save_undo */
}/* z_save */
/*
* save_undo
*
* This function does the dirty work for z_save_undo.
*
*/
internal static int save_undo()
{
long diff_size;
int stack_size;
undo_struct p;
if (main.option_undo_slots == 0) /* undo feature unavailable */
return -1;
/* save undo possible */
if (undo_count == main.option_undo_slots)
free_undo(1);
p = new undo_struct();
diff_size = mem_diff(ZMData, prev_zmp, main.h_dynamic_size, undo_diff);
stack_size = main.stack.Length;
GET_PC(out p.pc);
p.frame_count = main.frame_count;
p.diff_size = diff_size;
p.stack_size = (zword)stack_size;
p.frame_offset = (zword)main.fp; // p->frame_offset = fp - stack;
// p.undo_data = undo_diff;
p.undo_data = new zbyte[diff_size];
// System.Array.Copy(undo_diff, p.undo_data, diff_size);
Frotz.Other.ArrayCopy.Copy(undo_diff, 0, p.undo_data, 0, diff_size);
p.stack = new zword[main.stack.Length - main.sp];
// System.Array.Copy(main.stack, main.sp, p.stack, 0, main.stack.Length - main.sp);
Frotz.Other.ArrayCopy.Copy(main.stack, main.sp, p.stack, 0, main.stack.Length - main.sp);
p.sp = main.sp;
undo_mem.Add(p);
return 1;
}/* save_undo */
