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//! IO primitives for Sequoia.
use failure;
use std::fs::File;
use std::io::{self, Read, Write, Cursor};
use std::path::Path;
use std::slice;
use libc::{uint8_t, c_void, c_char, c_int, size_t, ssize_t, realloc};
#[cfg(unix)]
use std::os::unix::io::FromRawFd;
/// Opens a file returning a reader.
#[::ffi_catch_abort] #[no_mangle]
pub extern "system" fn pgp_reader_from_file(errp: Option<&mut *mut failure::Error>,
filename: *const c_char)
-> *mut Box<Read> {
ffi_make_fry_from_errp!(errp);
let filename = ffi_param_cstr!(filename).to_string_lossy().into_owned();
ffi_try_box!(File::open(Path::new(&filename))
.map(|r| Box::new(r))
.map_err(|e| e.into()))
}
/// Opens a file descriptor returning a reader.
#[cfg(unix)]
#[::ffi_catch_abort] #[no_mangle]
pub extern "system" fn pgp_reader_from_fd(fd: c_int)
-> *mut Box<Read> {
box_raw!(Box::new(unsafe { File::from_raw_fd(fd) }))
}
/// Creates a reader from a buffer.
#[::ffi_catch_abort] #[no_mangle]
pub extern "system" fn pgp_reader_from_bytes(buf: *const uint8_t,
len: size_t)
-> *mut Box<Read> {
assert!(!buf.is_null());
let buf = unsafe {
slice::from_raw_parts(buf, len as usize)
};
box_raw!(Box::new(Cursor::new(buf)))
}
/// Frees a reader.
#[::ffi_catch_abort] #[no_mangle]
pub extern "system" fn pgp_reader_free(reader: Option<&mut Box<Read>>) {
ffi_free!(reader)
}
/// Reads up to `len` bytes into `buf`.
#[::ffi_catch_abort] #[no_mangle]
pub extern "system" fn pgp_reader_read(errp: Option<&mut *mut failure::Error>,
reader: *mut Box<Read>,
buf: *mut uint8_t, len: size_t)
-> ssize_t {
ffi_make_fry_from_errp!(errp);
let reader = ffi_param_ref_mut!(reader);
assert!(!buf.is_null());
let buf = unsafe {
slice::from_raw_parts_mut(buf, len as usize)
};
ffi_try_or!(reader.read(buf).map_err(|e| e.into()), -1) as ssize_t
}
/// 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`.
#[::ffi_catch_abort] #[no_mangle]
pub extern "system" fn pgp_writer_from_file(errp: Option<&mut *mut failure::Error>,
filename: *const c_char)
-> *mut Box<Write> {
ffi_make_fry_from_errp!(errp);
let filename = ffi_param_cstr!(filename).to_string_lossy().into_owned();
ffi_try_box!(File::create(Path::new(&filename))
.map(|r| Box::new(r))
.map_err(|e| e.into()))
}
/// Opens a file descriptor returning a writer.
#[cfg(unix)]
#[::ffi_catch_abort] #[no_mangle]
pub extern "system" fn pgp_writer_from_fd(fd: c_int)
-> *mut Box<Write> {
box_raw!(Box::new(unsafe { File::from_raw_fd(fd) }))
}
/// Creates a writer from a buffer.
#[::ffi_catch_abort] #[no_mangle]
pub extern "system" fn pgp_writer_from_bytes(buf: *mut uint8_t,
len: size_t)
-> *mut Box<Write> {
assert!(!buf.is_null());
let buf = unsafe {
slice::from_raw_parts_mut(buf, len as usize)
};
box_raw!(Box::new(Cursor::new(buf)))
}
/// 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.
#[::ffi_catch_abort] #[no_mangle]
pub extern "system" fn pgp_writer_alloc(buf: *mut *mut c_void,
len: *mut size_t)
-> *mut Box<Write> {
let buf = ffi_param_ref_mut!(buf);
let len = ffi_param_ref_mut!(len);
box_raw!(Box::new(WriterAlloc {
buf: buf,
len: len,
}))
}
struct WriterAlloc {
buf: &'static mut *mut c_void,
len: &'static mut size_t,
}
impl Write for WriterAlloc {
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
let old_len = *self.len;
let new_len = old_len + buf.len();
let new = unsafe {
realloc(*self.buf, new_len)
};
if new.is_null() {
return Err(io::Error::new(io::ErrorKind::Other, "out of memory"));
}
*self.buf = new;
*self.len = new_len;
let sl = unsafe {
slice::from_raw_parts_mut(new as *mut u8, new_len)
};
&mut sl[old_len..].copy_from_slice(buf);
Ok(buf.len())
}
fn flush(&mut self) -> io::Result<()> {
// Do nothing.
Ok(())
}
}
/// Frees a writer.
#[::ffi_catch_abort] #[no_mangle]
pub extern "system" fn pgp_writer_free(writer: Option<&mut Box<Write>>) {
ffi_free!(writer)
}
/// Writes up to `len` bytes of `buf` into `writer`.
#[::ffi_catch_abort] #[no_mangle]
pub extern "system" fn pgp_writer_write(errp: Option<&mut *mut failure::Error>,
writer: *mut Box<Write>,
buf: *const uint8_t, len: size_t)
-> ssize_t {
ffi_make_fry_from_errp!(errp);
let writer = ffi_param_ref_mut!(writer);
assert!(!buf.is_null());
let buf = unsafe {
slice::from_raw_parts(buf, len as usize)
};
ffi_try_or!(writer.write(buf).map_err(|e| e.into()), -1) as ssize_t
}
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