4460e569cf
* witx tagged unions: updates to wig to use new semantics * wig: emit a `#variant: ()` union variant for empty variants * wasi-common: translate to use tagged unions * update to flattened layout of event struct * wig: generate layout tests, and delete bindgen ones the bindgen tests became out-of-date with the latest changes to the representation of unions, and the re-jiggering of various struct definitions that went along with it. * wasi: point at master with tagged union PR merged * fix event struct repr on windows
81 lines
2.5 KiB
Rust
81 lines
2.5 KiB
Rust
//! WASI host types. These are types that contain raw pointers and `usize`
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//! values, and so are platform-specific.
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#![allow(non_camel_case_types)]
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#![allow(non_snake_case)]
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use crate::wasi::*;
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use crate::{Error, Result};
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use std::{convert::TryInto, io, mem, slice};
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use wig::witx_host_types;
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witx_host_types!("snapshot" "wasi_snapshot_preview1");
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pub(crate) unsafe fn ciovec_to_host(ciovec: &__wasi_ciovec_t) -> io::IoSlice {
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let slice = slice::from_raw_parts(ciovec.buf as *const u8, ciovec.buf_len);
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io::IoSlice::new(slice)
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}
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pub(crate) unsafe fn iovec_to_host_mut(iovec: &mut __wasi_iovec_t) -> io::IoSliceMut {
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let slice = slice::from_raw_parts_mut(iovec.buf as *mut u8, iovec.buf_len);
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io::IoSliceMut::new(slice)
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}
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#[allow(dead_code)] // trouble with sockets
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#[derive(Clone, Copy, Debug)]
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#[repr(u8)]
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pub(crate) enum FileType {
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Unknown = __WASI_FILETYPE_UNKNOWN,
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BlockDevice = __WASI_FILETYPE_BLOCK_DEVICE,
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CharacterDevice = __WASI_FILETYPE_CHARACTER_DEVICE,
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Directory = __WASI_FILETYPE_DIRECTORY,
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RegularFile = __WASI_FILETYPE_REGULAR_FILE,
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SocketDgram = __WASI_FILETYPE_SOCKET_DGRAM,
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SocketStream = __WASI_FILETYPE_SOCKET_STREAM,
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Symlink = __WASI_FILETYPE_SYMBOLIC_LINK,
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}
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impl FileType {
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pub(crate) fn to_wasi(&self) -> __wasi_filetype_t {
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*self as __wasi_filetype_t
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}
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}
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#[derive(Debug, Clone)]
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pub(crate) struct Dirent {
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pub name: String,
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pub ftype: FileType,
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pub ino: u64,
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pub cookie: __wasi_dircookie_t,
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}
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impl Dirent {
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/// Serialize the directory entry to the format define by `__wasi_fd_readdir`,
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/// so that the serialized entries can be concatenated by the implementation.
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pub fn to_wasi_raw(&self) -> Result<Vec<u8>> {
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let name = self.name.as_bytes();
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let namlen = name.len();
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let dirent_size = mem::size_of::<__wasi_dirent_t>();
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let offset = dirent_size.checked_add(namlen).ok_or(Error::EOVERFLOW)?;
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let mut raw = Vec::<u8>::with_capacity(offset);
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raw.resize(offset, 0);
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let sys_dirent = raw.as_mut_ptr() as *mut __wasi_dirent_t;
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unsafe {
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sys_dirent.write_unaligned(__wasi_dirent_t {
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d_namlen: namlen.try_into()?,
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d_ino: self.ino,
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d_next: self.cookie,
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d_type: self.ftype.to_wasi(),
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});
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}
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let sys_name = unsafe { sys_dirent.offset(1) as *mut u8 };
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let sys_name = unsafe { slice::from_raw_parts_mut(sys_name, namlen) };
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sys_name.copy_from_slice(&name);
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Ok(raw)
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}
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}
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