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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 libc::{c_void, c_char, c_int, size_t, ssize_t, realloc};
#[cfg(unix)]
use std::os::unix::io::FromRawFd;
extern crate 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>),
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| ::failure::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: 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()
}
/// 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 = ::failure::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 = ::failure::Error::from(e).move_into_raw();
};
// Signal failure.
-1
})
}
/// Reads all data from reader and discards it.
#[::sequoia_ffi_macros::extern_fn] #[no_mangle]
pub extern "C" fn pgp_reader_discard(errp: Option<&mut *mut crate::error::Error>,
reader: *mut Reader)
-> ssize_t {
let mut reader = reader.ref_mut_raw();
io::copy(&mut reader, &mut io::sink())
.map(|n_read| n_read as ssize_t)
.unwrap_or_else(|e| {
if let Some(errp) = errp {
*errp = ::failure::Error::from(e).move_into_raw();
};
// Signal failure.
-1
})
}
/// Wraps a generic writer.
#[crate::ffi_wrapper_type(prefix = "pgp_")]
pub struct Writer(Box<dyn io::Write>);
/// Opens a file returning a writer.
///
/// The file will be created if it does not exist, or be truncated
/// otherwise. If you need more control, use `pgp_writer_from_fd`.
#[::sequoia_ffi_macros::extern_fn] #[no_mangle] pub extern "C"
fn pgp_writer_from_file(errp: Option<&mut *mut crate::error::Error>,
filename: *const c_char)
-> Maybe<Writer> {
let filename = ffi_param_cstr!(filename).to_string_lossy().into_owned();
File::create(Path::new(&filename))
.map(|w| -> Box<dyn io::Write> { Box::new(w) })
.map_err(|e| ::failure::Error::from(e))
.move_into_raw(errp)
}
/// Opens a file descriptor returning a writer.
#[cfg(unix)]
#[::sequoia_ffi_macros::extern_fn] #[no_mangle] pub extern "C"
fn pgp_writer_from_fd(fd: c_int) -> *mut Writer {
let w: Box<dyn io::Write> = Box::new(unsafe { File::from_raw_fd(fd) });
w.move_into_raw()
}
/// Creates a writer from a buffer.
#[::sequoia_ffi_macros::extern_fn] #[no_mangle] pub extern "C"
fn pgp_writer_from_bytes(buf: *mut u8, len: size_t) -> *mut Writer {
assert!(!buf.is_null());
let buf = unsafe {
slice::from_raw_parts_mut(buf, len as usize)
};
let w: Box<dyn io::Write> = Box::new(Cursor::new(buf));
w.move_into_raw()
}
/// Creates an allocating writer.
///
/// This writer allocates memory using `malloc`, and stores the
/// pointer to the memory and the number of bytes written to the given
/// locations `buf`, and `len`. Both must either be set to zero, or
/// reference a chunk of memory allocated using libc's heap allocator.
/// The caller is responsible to `free` it once the writer has been
/// destroyed.
#[::sequoia_ffi_macros::extern_fn] #[no_mangle] pub extern "C"
fn pgp_writer_alloc(buf: *mut *mut c_void, len: *mut size_t)
-> *mut Writer {
let buf = ffi_param_ref_mut!(buf);
let len = ffi_param_ref_mut!(len);
let w: Box<dyn io::Write> = Box::new(WriterAlloc {
buf: buf,
len: len,
});
w.move_into_raw()
}
struct WriterAlloc {
|
