| pub fn memory_set_len(cur_len: usize, offset: usize, value_len: usize, target_size: Option<usize>, limit: usize) -> Result<usize, u8> { | |
| if value_len == 0 { | |
| return Ok(cur_len); | |
| } | |
| let target = match target_size { | |
| Some(t) => t, | |
| None => value_len, | |
| }; | |
| match offset.checked_add(target) { | |
| Some(pos) => { | |
| if pos > limit { | |
| return Err(1); | |
| } | |
| } | |
| None => return Err(1), | |
| } | |
| if cur_len < offset + target { | |
| Ok(offset + target) | |
| } else { | |
| Ok(cur_len) | |
| } | |
| } | |