77 lines
1.8 KiB
Rust
77 lines
1.8 KiB
Rust
use crate::marker::PhantomData;
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use crate::slice;
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use libc::{c_void, iovec};
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#[derive(Copy, Clone)]
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#[repr(transparent)]
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pub struct IoSlice<'a> {
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vec: iovec,
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_p: PhantomData<&'a [u8]>,
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}
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impl<'a> IoSlice<'a> {
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#[inline]
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pub fn new(buf: &'a [u8]) -> IoSlice<'a> {
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IoSlice {
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vec: iovec { iov_base: buf.as_ptr() as *mut u8 as *mut c_void, iov_len: buf.len() },
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_p: PhantomData,
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}
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}
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#[inline]
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pub fn advance(&mut self, n: usize) {
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if self.vec.iov_len < n {
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panic!("advancing IoSlice beyond its length");
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}
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unsafe {
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self.vec.iov_len -= n;
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self.vec.iov_base = self.vec.iov_base.add(n);
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}
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}
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#[inline]
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pub fn as_slice(&self) -> &[u8] {
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unsafe { slice::from_raw_parts(self.vec.iov_base as *mut u8, self.vec.iov_len) }
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}
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}
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#[repr(transparent)]
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pub struct IoSliceMut<'a> {
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vec: iovec,
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_p: PhantomData<&'a mut [u8]>,
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}
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impl<'a> IoSliceMut<'a> {
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#[inline]
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pub fn new(buf: &'a mut [u8]) -> IoSliceMut<'a> {
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IoSliceMut {
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vec: iovec { iov_base: buf.as_mut_ptr() as *mut c_void, iov_len: buf.len() },
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_p: PhantomData,
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}
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}
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#[inline]
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pub fn advance(&mut self, n: usize) {
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if self.vec.iov_len < n {
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panic!("advancing IoSliceMut beyond its length");
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}
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unsafe {
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self.vec.iov_len -= n;
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self.vec.iov_base = self.vec.iov_base.add(n);
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}
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}
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#[inline]
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pub fn as_slice(&self) -> &[u8] {
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unsafe { slice::from_raw_parts(self.vec.iov_base as *mut u8, self.vec.iov_len) }
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}
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#[inline]
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pub fn as_mut_slice(&mut self) -> &mut [u8] {
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unsafe { slice::from_raw_parts_mut(self.vec.iov_base as *mut u8, self.vec.iov_len) }
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}
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}
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