| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you under the Apache License, Version 2.0 (the |
| // "License"); you may not use this file except in compliance |
| // with the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, |
| // software distributed under the License is distributed on an |
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| // KIND, either express or implied. See the License for the |
| // specific language governing permissions and limitations |
| // under the License.. |
| |
| use crate::marker::PhantomData; |
| use crate::slice; |
| |
| use sgx_libc::{c_void, iovec}; |
| |
| #[derive(Copy, Clone)] |
| #[repr(transparent)] |
| pub struct IoSlice<'a> { |
| vec: iovec, |
| _p: PhantomData<&'a [u8]>, |
| } |
| |
| impl<'a> IoSlice<'a> { |
| #[inline] |
| pub fn new(buf: &'a [u8]) -> IoSlice<'a> { |
| IoSlice { |
| vec: iovec { iov_base: buf.as_ptr() as *mut u8 as *mut c_void, iov_len: buf.len() }, |
| _p: PhantomData, |
| } |
| } |
| |
| #[inline] |
| pub fn advance(&mut self, n: usize) { |
| assert!(self.vec.iov_len >= n, "advancing IoSlice beyond its length"); |
| |
| unsafe { |
| self.vec.iov_len -= n; |
| self.vec.iov_base = self.vec.iov_base.add(n); |
| } |
| } |
| |
| #[inline] |
| pub fn as_slice(&self) -> &[u8] { |
| unsafe { slice::from_raw_parts(self.vec.iov_base as *mut u8, self.vec.iov_len) } |
| } |
| } |
| |
| #[repr(transparent)] |
| pub struct IoSliceMut<'a> { |
| vec: iovec, |
| _p: PhantomData<&'a mut [u8]>, |
| } |
| |
| impl<'a> IoSliceMut<'a> { |
| #[inline] |
| pub fn new(buf: &'a mut [u8]) -> IoSliceMut<'a> { |
| IoSliceMut { |
| vec: iovec { iov_base: buf.as_mut_ptr() as *mut c_void, iov_len: buf.len() }, |
| _p: PhantomData, |
| } |
| } |
| |
| #[inline] |
| pub fn advance(&mut self, n: usize) { |
| assert!(self.vec.iov_len >= n, "advancing IoSliceMut beyond its length"); |
| |
| unsafe { |
| self.vec.iov_len -= n; |
| self.vec.iov_base = self.vec.iov_base.add(n); |
| } |
| } |
| |
| #[inline] |
| pub fn as_slice(&self) -> &[u8] { |
| unsafe { slice::from_raw_parts(self.vec.iov_base as *mut u8, self.vec.iov_len) } |
| } |
| |
| #[inline] |
| pub fn as_mut_slice(&mut self) -> &mut [u8] { |
| unsafe { slice::from_raw_parts_mut(self.vec.iov_base as *mut u8, self.vec.iov_len) } |
| } |
| } |