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#![cfg(any(windows))]
mod enc;
mod windows;
use crate::enc::{Encoder, Encoding};
use std::ffi::OsString;
use std::str;
use winapi::_core::mem::transmute;
use winapi::_core::slice::{from_raw_parts, from_raw_parts_mut};
use winapi::_core::str::Utf8Error;
use winapi::shared::minwindef::{HGLOBAL, UINT};
use winapi::um::winbase::{GlobalAlloc, GlobalFree};
use winapi::vc::vcruntime::size_t;
const GMEM_FIXED: UINT = 0;
#[derive(Copy, Eq, PartialEq, Clone, Debug)]
pub enum GStrError {
AnsiEncode,
Utf8Error(Utf8Error),
}
impl From<Utf8Error> for GStrError {
fn from(err: Utf8Error) -> GStrError {
GStrError::Utf8Error(err)
}
}
pub struct GStr {
h: HGLOBAL,
len: usize,
has_free: bool,
}
impl Drop for GStr {
fn drop(&mut self) {
if !self.has_free {
return;
}
unsafe {
GlobalFree(self.h);
}
}
}
impl GStr {
pub fn capture(h: HGLOBAL, len: usize) -> GStr {
GStr {
h: h,
len: len,
has_free: true,
}
}
fn clone_from_slice_impl(bytes: &[u8], has_free: bool) -> GStr {
let len = bytes.len();
unsafe {
let h = GlobalAlloc(GMEM_FIXED, len as size_t);
let p = transmute::<HGLOBAL, *mut u8>(h);
let dst = from_raw_parts_mut::<u8>(p, len);
dst[..].clone_from_slice(bytes);
GStr {
h: h,
len: len,
has_free: has_free,
}
}
}
pub fn clone_from_slice_nofree(bytes: &[u8]) -> GStr {
GStr::clone_from_slice_impl(bytes, false)
}
pub fn to_bytes(&self) -> &[u8] {
unsafe {
let p = transmute::<HGLOBAL, *mut u8>(self.h);
from_raw_parts::<u8>(p, self.len)
}
}
pub fn handle(&self) -> HGLOBAL {
self.h
}
pub fn len(&self) -> usize {
self.len
}
pub fn to_ansi_str(&self) -> Result<OsString, GStrError> {
let bytes = self.to_bytes();
let s = Encoding::ANSI
.to_string(bytes)
.map_err(|_| GStrError::AnsiEncode)?;
let os_str = OsString::from(s);
Ok(os_str)
}
pub fn to_utf8_str(&self) -> Result<&str, GStrError> {
let bytes = self.to_bytes();
Ok(str::from_utf8(bytes)?)
}
}
#[test]
fn gstr_test() {
{
let text = "適当なGSTR";
let src = GStr::clone_from_slice_nofree(text.as_bytes());
assert_eq!(src.to_utf8_str().unwrap(), text);
assert_eq!(src.len(), 13);
let dst = GStr::capture(src.handle(), src.len());
assert_eq!(dst.to_utf8_str().unwrap(), text);
}
{
let text = "適当なGSTR";
let sjis = Encoding::ANSI.to_bytes(text).unwrap();
assert_eq!(sjis.len(), 10);
let src = GStr::clone_from_slice_nofree(&sjis[..]);
assert_eq!(src.len(), 10);
let src_osstr = src.to_ansi_str().unwrap();
assert_eq!(src_osstr.len(), 13);
let dst = GStr::capture(src.handle(), src.len());
assert_eq!(src_osstr, dst.to_ansi_str().unwrap());
let src_str = src_osstr.to_str().unwrap();
assert_eq!(src_str, text);
}
}