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|
//! IO primitives for Sequoia.
use std::fs::File;
use std::io::{self, Read, Write, Cursor};
use std::path::Path;
use std::slice;
use std::sync::Mutex;
use libc::{c_void, c_char, size_t, ssize_t, realloc};
#[cfg(unix)]
use std::os::unix::io::FromRawFd;
use sequoia_openpgp as openpgp;
use crate::Maybe;
use crate::RefMutRaw;
use crate::MoveIntoRaw;
use crate::MoveResultIntoRaw;
/// Wraps a generic reader.
#[crate::ffi_wrapper_type(prefix = "pgp_")]
pub struct Reader(ReaderKind);
/// Specializes readers.
///
/// In some cases, we want to call functions on concrete types. To
/// avoid nasty hacks, we have specialized variants for that.
pub(crate) enum ReaderKind {
Generic(Box<dyn io::Read + Send + Sync>),
Armored(openpgp::armor::Reader<'static>),
}
impl Read for ReaderKind {
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
use self::ReaderKind::*;
match self {
Generic(ref mut r) => r.read(buf),
Armored(ref mut r) => r.read(buf),
}
}
}
/// Opens a file returning a reader.
#[::sequoia_ffi_macros::extern_fn] #[no_mangle]
pub extern "C" fn pgp_reader_from_file(errp: Option<&mut *mut crate::error::Error>,
filename: *const c_char)
-> Maybe<Reader> {
let filename = ffi_param_cstr!(filename).to_string_lossy().into_owned();
File::open(Path::new(&filename))
.map(|r| ReaderKind::Generic(Box::new(r)))
.map_err(|e| ::anyhow::Error::from(e))
.move_into_raw(errp)
}
/// Opens a file descriptor returning a reader.
#[cfg(unix)]
#[::sequoia_ffi_macros::extern_fn] #[no_mangle]
pub extern "C" fn pgp_reader_from_fd(fd: libc::c_int)
-> *mut Reader {
ReaderKind::Generic(Box::new(unsafe {
File::from_raw_fd(fd)
})).move_into_raw()
}
/// Creates a reader from a buffer.
#[::sequoia_ffi_macros::extern_fn] #[no_mangle]
pub extern "C" fn pgp_reader_from_bytes(buf: *const u8,
len: size_t)
-> *mut Reader {
assert!(!buf.is_null());
let buf = unsafe {
slice::from_raw_parts(buf, len as usize)
};
ReaderKind::Generic(Box::new(Cursor::new(buf))).move_into_raw()
}
/// The callback type for the generic callback-based reader interface.
type ReaderCallbackFn = extern fn(*mut c_void, *const c_void, size_t) -> ssize_t;
/// Creates an reader from a callback and cookie.
///
/// This reader calls the given callback to write data.
///
/// # Sending objects across thread boundaries
///
/// If you send a Sequoia object (like a pgp_verifier_t) that reads
/// from an callback across thread boundaries, you must make sure that
/// the callback and cookie support that as well.
#[::sequoia_ffi_macros::extern_fn] #[no_mangle] pub extern "C"
fn pgp_reader_from_callback(cb: ReaderCallbackFn,
cookie: *mut c_void)
-> *mut Reader {
let r: Box<dyn io::Read + Send + Sync> =
Box::new(ReaderCallback(Mutex::new(ReaderClosure {
cb, cookie,
})));
ReaderKind::Generic(r).move_into_raw()
}
/// A generic callback-based reader implementation.
struct ReaderCallback(Mutex<ReaderClosure>);
struct ReaderClosure {
cb: ReaderCallbackFn,
cookie: *mut c_void,
}
unsafe impl Send for ReaderClosure {}
impl Read for ReaderCallback {
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
let closure = self.0.get_mut().expect("Mutex not to be poisoned");
let r =
(closure.cb)(closure.cookie,
buf.as_mut_ptr() as *mut c_void, buf.len());
if r < 0 {
use std::io as stdio;
Err(stdio::Error::new(stdio::ErrorKind::Other,
"Unknown error in read callback"))
} else {
Ok(r as usize)
}
}
}
/// Reads up to `len` bytes into `buf`.
#[::sequoia_ffi_macros::extern_fn] #[no_mangle]
pub extern "C" fn pgp_reader_read(errp: Option<&mut *mut crate::error::Error>,
reader: *mut Reader,
buf: *mut u8, len: size_t)
-> ssize_t {
assert!(!buf.is_null());
let buf = unsafe {
slice::from_raw_parts_mut(buf, len as usize)
};
reader.ref_mut_raw().read(buf)
.map(|n_read| n_read as ssize_t)
.unwrap_or_else(|e| {
if let Some(errp) = errp {
*errp = ::anyhow::Error::from(e).move_into_raw();
};
// Signal failure.
-1
})
}
/// Copies up to `len` bytes from `source` to `dest`.
#[::sequoia_ffi_macros::extern_fn] #[no_mangle]
pub extern "C" fn pgp_reader_copy(errp: Option<&mut *mut crate::error::Error>,
source: *mut Reader,
dest: *mut Writer,
len: size_t)
-> ssize_t {
let source = source.ref_mut_raw();
let dest = dest.ref_mut_raw();
io::copy(&mut source.take(len as u64), dest)
.map(|n_read| n_read as ssize_t)
.unwrap_or_else(|e| {
if let Some(errp) = errp {
*errp = ::anyhow::Error::from(e).move_into_raw();
};
// Signal failure.
-1
})
}
/// Reads all data from reader and discards it.
#[::sequoia_ffi_macros::extern_fn] #[no_mangle]
pu
|