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use std::ffi::CString;
use std::io;
use std::os::raw::c_void;
use std::ptr;
use kernel32::*;
use user32::{FindWindowExA, RegisterWindowMessageA, SendMessageA};
use winapi::INVALID_HANDLE_VALUE;
use winapi::memoryapi::FILE_MAP_WRITE;
use winapi::minwindef::ATOM;
use winapi::windef::HWND;
use winapi::winnt::{HANDLE, PAGE_READWRITE};
use super::{Handle, Session};
use super::ipc::*;
use super::raw::{MutRawBytes, RawBytes};
pub struct UserHandle {
handle: HWND,
file_mapping_atom: ATOM,
file_mapping: HANDLE,
msg_id: u32,
data: *mut u8,
}
impl UserHandle {
pub fn new() -> io::Result<Self> {
unsafe {
let win_name = CString::new("UIPCMAIN").unwrap();
let handle = FindWindowExA(
ptr::null_mut(),
ptr::null_mut(),
win_name.as_ptr(),
ptr::null_mut());
if handle == ptr::null_mut() {
return Err(io::Error::new(
io::ErrorKind::ConnectionRefused,
"cannot connect to user FSUIPC: cannot create window handle"));
}
let msg_name = CString::new("FsasmLib:IPC").unwrap();
let msg_id = RegisterWindowMessageA(msg_name.as_ptr());
if msg_id == 0 {
return Err(io::Error::new(
io::ErrorKind::ConnectionRefused,
"cannot connect to user FSUIPC: cannot register window message"));
}
let file_mapping_name = CString::new(
format!("FsasmLib:IPC:{:x}:{:x}",
GetCurrentProcessId(),
next_file_mapping_index())).unwrap();
let file_mapping_atom = GlobalAddAtomA(file_mapping_name.as_ptr());
if file_mapping_atom == 0 {
return Err(io::Error::new(
io::ErrorKind::ConnectionRefused,
"cannot connect to user FSUIPC: cannot add global atom"));
}
let file_mapping = CreateFileMappingA(
INVALID_HANDLE_VALUE,
ptr::null_mut(),
PAGE_READWRITE,
0, FILE_MAPPING_LEN as u32,
file_mapping_name.as_ptr());
if file_mapping == ptr::null_mut() {
return Err(io::Error::new(
io::ErrorKind::ConnectionRefused,
"cannot connect to user FSUIPC: cannot create file mapping"));
}
let data = MapViewOfFile(file_mapping, FILE_MAP_WRITE, 0, 0, 0) as *mut u8;
if data == ptr::null_mut() {
return Err(io::Error::new(
io::ErrorKind::ConnectionRefused,
"cannot connect to user FSUIPC: cannot map view of file"));
}
Ok(UserHandle {
handle: handle,
file_mapping_atom: file_mapping_atom,
file_mapping: file_mapping,
msg_id: msg_id,
data: data,
})
}
}
}
impl<'a> Handle<'a> for UserHandle {
type Sess = UserSession<'a>;
fn session(&'a mut self) -> UserSession<'a> {
let data = self.data;
UserSession {
handle: self,
buffer: MutRawBytes::new(data, FILE_MAPPING_LEN)
}
}
}
impl Drop for UserHandle {
fn drop(&mut self) {
unsafe {
GlobalDeleteAtom(self.file_mapping_atom);
UnmapViewOfFile(self.data as *const c_void);
CloseHandle(self.file_mapping);
}
}
}
pub struct UserSession<'a> {
handle: &'a mut UserHandle,
buffer: MutRawBytes,
}
impl<'a> Session for UserSession<'a> {
fn read_bytes(&mut self, offset: u16, dest: *mut u8, len: usize) -> io::Result<usize> {
self.buffer.write_rsd(offset, dest, len)
}
fn write_bytes(&mut self, offset: u16, src: *const u8, len: usize) -> io::Result<usize> {
self.buffer.write_wsd(offset, src, len)
}
fn process(mut self) -> io::Result<usize> {
unsafe {
self.buffer.write_header(&MsgHeader::TerminationMark)?;
let send_result = SendMessageA(
self.handle.handle,
self.handle.msg_id,
self.handle.file_mapping_atom as WinUInt,
0);
if send_result != FS6IPC_MESSAGE_SUCCESS {
return Err(io::Error::new(io::ErrorKind::InvalidData, format!(
"FSUIPC rejected the requests with error {}; possible buffer corruption",
send_result)));
}
let mut buffer = RawBytes::new(self.handle.data, FILE_MAPPING_LEN);
loop {
let header = buffer.read_header()?;
match &header {
&MsgHeader::ReadStateData { offset: _, len, target } => {
let mut output = MutRawBytes::new(target, len);
buffer.read_body(&header, &mut output)?;
},
&MsgHeader::WriteStateData { offset: _, len: _ } => {
let mut output = io::sink();
buffer.read_body(&header, &mut output)?;
},
&MsgHeader::TerminationMark => return Ok(buffer.consumed()),
}
}
}
}
}
fn next_file_mapping_index() -> u32 {
unsafe {
let next = FILE_MAPPING_INDEX;
FILE_MAPPING_INDEX += 1;
next
}
}
const FS6IPC_MESSAGE_SUCCESS: WinInt = 1;
const FILE_MAPPING_LEN: usize = 64*1024;
static mut FILE_MAPPING_INDEX: u32 = 0;