mirror of
https://github.com/denoland/deno.git
synced 2024-11-24 15:19:26 -05:00
794 lines
20 KiB
Rust
794 lines
20 KiB
Rust
// Copyright 2021 the Deno authors. All rights reserved. MIT license.
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use deno_core::error::bad_resource_id;
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use deno_core::error::generic_error;
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use deno_core::error::range_error;
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use deno_core::error::type_error;
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use deno_core::error::AnyError;
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use deno_core::include_js_files;
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use deno_core::op_async;
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use deno_core::op_sync;
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use deno_core::serde_json;
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use deno_core::serde_json::json;
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use deno_core::serde_json::Value;
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use deno_core::Extension;
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use deno_core::OpState;
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use deno_core::Resource;
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use deno_core::ResourceId;
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use deno_core::ZeroCopyBuf;
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use dlopen::raw::Library;
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use libffi::middle::Arg;
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use serde::Deserialize;
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use serde::Serialize;
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use std::borrow::Cow;
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use std::cell::RefCell;
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use std::collections::HashMap;
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use std::ffi::c_void;
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use std::ffi::CStr;
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use std::os::raw::c_char;
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use std::path::Path;
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use std::path::PathBuf;
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use std::ptr;
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use std::rc::Rc;
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pub struct Unstable(pub bool);
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fn check_unstable(state: &OpState, api_name: &str) {
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let unstable = state.borrow::<Unstable>();
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if !unstable.0 {
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eprintln!(
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"Unstable API '{}'. The --unstable flag must be provided.",
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api_name
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);
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std::process::exit(70);
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}
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}
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pub trait FfiPermissions {
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fn check(&mut self, path: Option<&Path>) -> Result<(), AnyError>;
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}
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#[derive(Clone)]
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struct Symbol {
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cif: libffi::middle::Cif,
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ptr: libffi::middle::CodePtr,
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parameter_types: Vec<NativeType>,
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result_type: NativeType,
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}
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unsafe impl Send for Symbol {}
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unsafe impl Sync for Symbol {}
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struct DynamicLibraryResource {
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lib: Library,
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symbols: HashMap<String, Symbol>,
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}
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impl Resource for DynamicLibraryResource {
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fn name(&self) -> Cow<str> {
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"dynamicLibrary".into()
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}
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fn close(self: Rc<Self>) {
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drop(self)
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}
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}
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impl DynamicLibraryResource {
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fn register(
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&mut self,
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symbol: String,
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foreign_fn: ForeignFunction,
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) -> Result<(), AnyError> {
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// By default, Err returned by this function does not tell
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// which symbol wasn't exported. So we'll modify the error
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// message to include the name of symbol.
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let fn_ptr = match unsafe { self.lib.symbol::<*const c_void>(&symbol) } {
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Ok(value) => Ok(value),
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Err(err) => Err(generic_error(format!(
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"Failed to register symbol {}: {}",
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symbol,
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err.to_string()
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))),
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}?;
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let ptr = libffi::middle::CodePtr::from_ptr(fn_ptr as _);
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let cif = libffi::middle::Cif::new(
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foreign_fn
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.parameters
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.clone()
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.into_iter()
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.map(libffi::middle::Type::from),
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foreign_fn.result.into(),
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);
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self.symbols.insert(
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symbol,
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Symbol {
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cif,
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ptr,
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parameter_types: foreign_fn.parameters,
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result_type: foreign_fn.result,
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},
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);
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Ok(())
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}
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}
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pub fn init<P: FfiPermissions + 'static>(unstable: bool) -> Extension {
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Extension::builder()
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.js(include_js_files!(
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prefix "deno:ext/ffi",
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"00_ffi.js",
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))
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.ops(vec![
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("op_ffi_load", op_sync(op_ffi_load::<P>)),
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("op_ffi_call", op_sync(op_ffi_call)),
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("op_ffi_call_nonblocking", op_async(op_ffi_call_nonblocking)),
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("op_ffi_ptr_of", op_sync(op_ffi_ptr_of::<P>)),
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("op_ffi_buf_copy_into", op_sync(op_ffi_buf_copy_into::<P>)),
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("op_ffi_cstr_read", op_sync(op_ffi_cstr_read::<P>)),
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("op_ffi_read_u8", op_sync(op_ffi_read_u8::<P>)),
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("op_ffi_read_i8", op_sync(op_ffi_read_i8::<P>)),
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("op_ffi_read_u16", op_sync(op_ffi_read_u16::<P>)),
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("op_ffi_read_i16", op_sync(op_ffi_read_i16::<P>)),
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("op_ffi_read_u32", op_sync(op_ffi_read_u32::<P>)),
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("op_ffi_read_i32", op_sync(op_ffi_read_i32::<P>)),
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("op_ffi_read_u64", op_sync(op_ffi_read_u64::<P>)),
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("op_ffi_read_f32", op_sync(op_ffi_read_f32::<P>)),
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("op_ffi_read_f64", op_sync(op_ffi_read_f64::<P>)),
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])
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.state(move |state| {
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// Stolen from deno_webgpu, is there a better option?
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state.put(Unstable(unstable));
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Ok(())
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})
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.build()
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}
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#[derive(Clone, Copy, Debug, Deserialize, Eq, PartialEq)]
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#[serde(rename_all = "lowercase")]
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enum NativeType {
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Void,
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U8,
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I8,
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U16,
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I16,
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U32,
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I32,
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U64,
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I64,
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USize,
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ISize,
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F32,
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F64,
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Pointer,
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}
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impl From<NativeType> for libffi::middle::Type {
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fn from(native_type: NativeType) -> Self {
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match native_type {
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NativeType::Void => libffi::middle::Type::void(),
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NativeType::U8 => libffi::middle::Type::u8(),
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NativeType::I8 => libffi::middle::Type::i8(),
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NativeType::U16 => libffi::middle::Type::u16(),
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NativeType::I16 => libffi::middle::Type::i16(),
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NativeType::U32 => libffi::middle::Type::u32(),
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NativeType::I32 => libffi::middle::Type::i32(),
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NativeType::U64 => libffi::middle::Type::u64(),
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NativeType::I64 => libffi::middle::Type::i64(),
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NativeType::USize => libffi::middle::Type::usize(),
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NativeType::ISize => libffi::middle::Type::isize(),
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NativeType::F32 => libffi::middle::Type::f32(),
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NativeType::F64 => libffi::middle::Type::f64(),
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NativeType::Pointer => libffi::middle::Type::pointer(),
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}
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}
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}
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#[repr(C)]
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union NativeValue {
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void_value: (),
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u8_value: u8,
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i8_value: i8,
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u16_value: u16,
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i16_value: i16,
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u32_value: u32,
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i32_value: i32,
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u64_value: u64,
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i64_value: i64,
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usize_value: usize,
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isize_value: isize,
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f32_value: f32,
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f64_value: f64,
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pointer: *const u8,
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}
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impl NativeValue {
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fn new(native_type: NativeType, value: Value) -> Result<Self, AnyError> {
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let value = match native_type {
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NativeType::Void => Self { void_value: () },
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NativeType::U8 => Self {
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u8_value: value_as_uint::<u8>(value)?,
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},
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NativeType::I8 => Self {
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i8_value: value_as_int::<i8>(value)?,
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},
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NativeType::U16 => Self {
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u16_value: value_as_uint::<u16>(value)?,
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},
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NativeType::I16 => Self {
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i16_value: value_as_int::<i16>(value)?,
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},
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NativeType::U32 => Self {
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u32_value: value_as_uint::<u32>(value)?,
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},
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NativeType::I32 => Self {
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i32_value: value_as_int::<i32>(value)?,
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},
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NativeType::U64 => Self {
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u64_value: value_as_uint::<u64>(value)?,
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},
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NativeType::I64 => Self {
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i64_value: value_as_int::<i64>(value)?,
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},
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NativeType::USize => Self {
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usize_value: value_as_uint::<usize>(value)?,
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},
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NativeType::ISize => Self {
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isize_value: value_as_int::<isize>(value)?,
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},
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NativeType::F32 => Self {
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f32_value: value_as_f32(value)?,
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},
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NativeType::F64 => Self {
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f64_value: value_as_f64(value)?,
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},
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NativeType::Pointer => {
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if value.is_null() {
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Self {
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pointer: ptr::null(),
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}
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} else {
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Self {
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pointer: u64::from(serde_json::from_value::<U32x2>(value)?)
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as *const u8,
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}
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}
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}
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};
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Ok(value)
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}
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fn buffer(ptr: *const u8) -> Self {
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Self { pointer: ptr }
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}
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unsafe fn as_arg(&self, native_type: NativeType) -> Arg {
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match native_type {
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NativeType::Void => Arg::new(&self.void_value),
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NativeType::U8 => Arg::new(&self.u8_value),
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NativeType::I8 => Arg::new(&self.i8_value),
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NativeType::U16 => Arg::new(&self.u16_value),
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NativeType::I16 => Arg::new(&self.i16_value),
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NativeType::U32 => Arg::new(&self.u32_value),
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NativeType::I32 => Arg::new(&self.i32_value),
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NativeType::U64 => Arg::new(&self.u64_value),
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NativeType::I64 => Arg::new(&self.i64_value),
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NativeType::USize => Arg::new(&self.usize_value),
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NativeType::ISize => Arg::new(&self.isize_value),
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NativeType::F32 => Arg::new(&self.f32_value),
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NativeType::F64 => Arg::new(&self.f64_value),
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NativeType::Pointer => Arg::new(&self.pointer),
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}
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}
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}
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fn value_as_uint<T: TryFrom<u64>>(value: Value) -> Result<T, AnyError> {
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match value.as_u64().and_then(|v| T::try_from(v).ok()) {
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Some(value) => Ok(value),
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None => Err(type_error(format!(
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"Expected FFI argument to be an unsigned integer, but got {:?}",
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value
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))),
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}
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}
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fn value_as_int<T: TryFrom<i64>>(value: Value) -> Result<T, AnyError> {
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match value.as_i64().and_then(|v| T::try_from(v).ok()) {
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Some(value) => Ok(value),
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None => Err(type_error(format!(
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"Expected FFI argument to be a signed integer, but got {:?}",
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value
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))),
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}
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}
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fn value_as_f32(value: Value) -> Result<f32, AnyError> {
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Ok(value_as_f64(value)? as f32)
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}
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fn value_as_f64(value: Value) -> Result<f64, AnyError> {
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match value.as_f64() {
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Some(value) => Ok(value),
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None => Err(type_error(format!(
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"Expected FFI argument to be a double, but got {:?}",
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value
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))),
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}
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}
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#[derive(Serialize, Deserialize, Debug)]
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struct U32x2(u32, u32);
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impl From<u64> for U32x2 {
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fn from(value: u64) -> Self {
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Self((value >> 32) as u32, value as u32)
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}
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}
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impl From<U32x2> for u64 {
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fn from(value: U32x2) -> Self {
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(value.0 as u64) << 32 | value.1 as u64
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}
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}
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#[derive(Deserialize, Debug)]
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#[serde(rename_all = "camelCase")]
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struct ForeignFunction {
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parameters: Vec<NativeType>,
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result: NativeType,
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}
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#[derive(Deserialize, Debug)]
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struct FfiLoadArgs {
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path: String,
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symbols: HashMap<String, ForeignFunction>,
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}
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// `path` is only used on Windows.
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#[allow(unused_variables)]
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pub(crate) fn format_error(e: dlopen::Error, path: String) -> String {
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match e {
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#[cfg(target_os = "windows")]
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// This calls FormatMessageW with library path
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// as replacement for the insert sequences.
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// Unlike libstd which passes the FORMAT_MESSAGE_IGNORE_INSERTS
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// flag without any arguments.
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//
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// https://github.com/denoland/deno/issues/11632
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dlopen::Error::OpeningLibraryError(e) => {
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use std::ffi::OsStr;
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use std::os::windows::ffi::OsStrExt;
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use winapi::shared::minwindef::DWORD;
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use winapi::shared::winerror::ERROR_INSUFFICIENT_BUFFER;
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use winapi::um::errhandlingapi::GetLastError;
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use winapi::um::winbase::FormatMessageW;
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use winapi::um::winbase::FORMAT_MESSAGE_ARGUMENT_ARRAY;
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use winapi::um::winbase::FORMAT_MESSAGE_FROM_SYSTEM;
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use winapi::um::winnt::LANG_SYSTEM_DEFAULT;
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use winapi::um::winnt::MAKELANGID;
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use winapi::um::winnt::SUBLANG_SYS_DEFAULT;
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let err_num = match e.raw_os_error() {
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Some(err_num) => err_num,
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// This should never hit unless dlopen changes its error type.
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None => return e.to_string(),
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};
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// Language ID (0x0800)
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let lang_id =
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MAKELANGID(LANG_SYSTEM_DEFAULT, SUBLANG_SYS_DEFAULT) as DWORD;
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let mut buf = vec![0; 500];
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let path = OsStr::new(&path)
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.encode_wide()
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.chain(Some(0).into_iter())
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.collect::<Vec<_>>();
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let arguments = [path.as_ptr()];
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loop {
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unsafe {
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let length = FormatMessageW(
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FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ARGUMENT_ARRAY,
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std::ptr::null_mut(),
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err_num as DWORD,
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lang_id as DWORD,
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buf.as_mut_ptr(),
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buf.len() as DWORD,
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arguments.as_ptr() as _,
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);
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if length == 0 {
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let err_num = GetLastError();
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if err_num == ERROR_INSUFFICIENT_BUFFER {
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buf.resize(buf.len() * 2, 0);
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continue;
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}
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// Something went wrong, just return the original error.
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return e.to_string();
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}
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let msg = String::from_utf16_lossy(&buf[..length as usize]);
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return msg;
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}
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}
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}
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_ => e.to_string(),
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}
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}
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fn op_ffi_load<FP>(
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state: &mut deno_core::OpState,
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args: FfiLoadArgs,
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_: (),
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) -> Result<ResourceId, AnyError>
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where
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FP: FfiPermissions + 'static,
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{
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let path = args.path;
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check_unstable(state, "Deno.dlopen");
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let permissions = state.borrow_mut::<FP>();
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permissions.check(Some(&PathBuf::from(&path)))?;
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let lib = Library::open(&path).map_err(|e| {
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dlopen::Error::OpeningLibraryError(std::io::Error::new(
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std::io::ErrorKind::Other,
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format_error(e, path),
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))
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})?;
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let mut resource = DynamicLibraryResource {
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lib,
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symbols: HashMap::new(),
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};
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for (symbol, foreign_fn) in args.symbols {
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resource.register(symbol, foreign_fn)?;
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}
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Ok(state.resource_table.add(resource))
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}
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|
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#[derive(Deserialize)]
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#[serde(rename_all = "camelCase")]
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struct FfiCallArgs {
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rid: ResourceId,
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symbol: String,
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parameters: Vec<Value>,
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buffers: Vec<Option<ZeroCopyBuf>>,
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}
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fn ffi_call(args: FfiCallArgs, symbol: &Symbol) -> Result<Value, AnyError> {
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let buffers: Vec<Option<&[u8]>> = args
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.buffers
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.iter()
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.map(|buffer| buffer.as_ref().map(|buffer| &buffer[..]))
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.collect();
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let mut native_values: Vec<NativeValue> = vec![];
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for (&native_type, value) in symbol
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.parameter_types
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.iter()
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.zip(args.parameters.into_iter())
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{
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match native_type {
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NativeType::Pointer => match value.as_u64() {
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Some(idx) => {
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let buf = buffers
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.get(idx as usize)
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.ok_or_else(|| {
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generic_error(format!("No buffer present at index {}", idx))
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})?
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.unwrap();
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native_values.push(NativeValue::buffer(buf.as_ptr()));
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}
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_ => {
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let value = NativeValue::new(native_type, value)?;
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native_values.push(value);
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}
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},
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_ => {
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let value = NativeValue::new(native_type, value)?;
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native_values.push(value);
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}
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}
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}
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let call_args = symbol
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.parameter_types
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.iter()
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.zip(native_values.iter())
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.map(|(&native_type, native_value)| unsafe {
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native_value.as_arg(native_type)
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|
})
|
|
.collect::<Vec<_>>();
|
|
|
|
Ok(match symbol.result_type {
|
|
NativeType::Void => {
|
|
json!(unsafe { symbol.cif.call::<()>(symbol.ptr, &call_args) })
|
|
}
|
|
NativeType::U8 => {
|
|
json!(unsafe { symbol.cif.call::<u8>(symbol.ptr, &call_args) })
|
|
}
|
|
NativeType::I8 => {
|
|
json!(unsafe { symbol.cif.call::<i8>(symbol.ptr, &call_args) })
|
|
}
|
|
NativeType::U16 => {
|
|
json!(unsafe { symbol.cif.call::<u16>(symbol.ptr, &call_args) })
|
|
}
|
|
NativeType::I16 => {
|
|
json!(unsafe { symbol.cif.call::<i16>(symbol.ptr, &call_args) })
|
|
}
|
|
NativeType::U32 => {
|
|
json!(unsafe { symbol.cif.call::<u32>(symbol.ptr, &call_args) })
|
|
}
|
|
NativeType::I32 => {
|
|
json!(unsafe { symbol.cif.call::<i32>(symbol.ptr, &call_args) })
|
|
}
|
|
NativeType::U64 => {
|
|
json!(unsafe { symbol.cif.call::<u64>(symbol.ptr, &call_args) })
|
|
}
|
|
NativeType::I64 => {
|
|
json!(unsafe { symbol.cif.call::<i64>(symbol.ptr, &call_args) })
|
|
}
|
|
NativeType::USize => {
|
|
json!(unsafe { symbol.cif.call::<usize>(symbol.ptr, &call_args) })
|
|
}
|
|
NativeType::ISize => {
|
|
json!(unsafe { symbol.cif.call::<isize>(symbol.ptr, &call_args) })
|
|
}
|
|
NativeType::F32 => {
|
|
json!(unsafe { symbol.cif.call::<f32>(symbol.ptr, &call_args) })
|
|
}
|
|
NativeType::F64 => {
|
|
json!(unsafe { symbol.cif.call::<f64>(symbol.ptr, &call_args) })
|
|
}
|
|
NativeType::Pointer => {
|
|
json!(U32x2::from(unsafe {
|
|
symbol.cif.call::<*const u8>(symbol.ptr, &call_args)
|
|
} as u64))
|
|
}
|
|
})
|
|
}
|
|
|
|
fn op_ffi_call(
|
|
state: &mut deno_core::OpState,
|
|
args: FfiCallArgs,
|
|
_: (),
|
|
) -> Result<Value, AnyError> {
|
|
let resource = state
|
|
.resource_table
|
|
.get::<DynamicLibraryResource>(args.rid)?;
|
|
|
|
let symbol = resource
|
|
.symbols
|
|
.get(&args.symbol)
|
|
.ok_or_else(bad_resource_id)?;
|
|
|
|
ffi_call(args, symbol)
|
|
}
|
|
|
|
/// A non-blocking FFI call.
|
|
async fn op_ffi_call_nonblocking(
|
|
state: Rc<RefCell<deno_core::OpState>>,
|
|
args: FfiCallArgs,
|
|
_: (),
|
|
) -> Result<Value, AnyError> {
|
|
let resource = state
|
|
.borrow()
|
|
.resource_table
|
|
.get::<DynamicLibraryResource>(args.rid)?;
|
|
let symbols = &resource.symbols;
|
|
let symbol = symbols
|
|
.get(&args.symbol)
|
|
.ok_or_else(bad_resource_id)?
|
|
.clone();
|
|
|
|
tokio::task::spawn_blocking(move || ffi_call(args, &symbol))
|
|
.await
|
|
.unwrap()
|
|
}
|
|
|
|
fn op_ffi_ptr_of<FP>(
|
|
state: &mut deno_core::OpState,
|
|
buf: ZeroCopyBuf,
|
|
_: (),
|
|
) -> Result<U32x2, AnyError>
|
|
where
|
|
FP: FfiPermissions + 'static,
|
|
{
|
|
let permissions = state.borrow_mut::<FP>();
|
|
permissions.check(None)?;
|
|
|
|
Ok(U32x2::from(buf.as_ptr() as u64))
|
|
}
|
|
|
|
fn op_ffi_buf_copy_into<FP>(
|
|
state: &mut deno_core::OpState,
|
|
(src, mut dst, len): (U32x2, ZeroCopyBuf, usize),
|
|
_: (),
|
|
) -> Result<(), AnyError>
|
|
where
|
|
FP: FfiPermissions + 'static,
|
|
{
|
|
let permissions = state.borrow_mut::<FP>();
|
|
permissions.check(None)?;
|
|
|
|
if dst.len() < len {
|
|
Err(range_error(
|
|
"Destination length is smaller than source length",
|
|
))
|
|
} else {
|
|
let src = u64::from(src) as *const u8;
|
|
unsafe { ptr::copy(src, dst.as_mut_ptr(), len) };
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
fn op_ffi_cstr_read<FP>(
|
|
state: &mut deno_core::OpState,
|
|
ptr: U32x2,
|
|
_: (),
|
|
) -> Result<String, AnyError>
|
|
where
|
|
FP: FfiPermissions + 'static,
|
|
{
|
|
let permissions = state.borrow_mut::<FP>();
|
|
permissions.check(None)?;
|
|
|
|
let ptr = u64::from(ptr) as *const c_char;
|
|
Ok(unsafe { CStr::from_ptr(ptr) }.to_str()?.to_string())
|
|
}
|
|
|
|
fn op_ffi_read_u8<FP>(
|
|
state: &mut deno_core::OpState,
|
|
ptr: U32x2,
|
|
_: (),
|
|
) -> Result<u8, AnyError>
|
|
where
|
|
FP: FfiPermissions + 'static,
|
|
{
|
|
let permissions = state.borrow_mut::<FP>();
|
|
permissions.check(None)?;
|
|
|
|
Ok(unsafe { ptr::read_unaligned(u64::from(ptr) as *const u8) })
|
|
}
|
|
|
|
fn op_ffi_read_i8<FP>(
|
|
state: &mut deno_core::OpState,
|
|
ptr: U32x2,
|
|
_: (),
|
|
) -> Result<i8, AnyError>
|
|
where
|
|
FP: FfiPermissions + 'static,
|
|
{
|
|
let permissions = state.borrow_mut::<FP>();
|
|
permissions.check(None)?;
|
|
|
|
Ok(unsafe { ptr::read_unaligned(u64::from(ptr) as *const i8) })
|
|
}
|
|
|
|
fn op_ffi_read_u16<FP>(
|
|
state: &mut deno_core::OpState,
|
|
ptr: U32x2,
|
|
_: (),
|
|
) -> Result<u16, AnyError>
|
|
where
|
|
FP: FfiPermissions + 'static,
|
|
{
|
|
let permissions = state.borrow_mut::<FP>();
|
|
permissions.check(None)?;
|
|
|
|
Ok(unsafe { ptr::read_unaligned(u64::from(ptr) as *const u16) })
|
|
}
|
|
|
|
fn op_ffi_read_i16<FP>(
|
|
state: &mut deno_core::OpState,
|
|
ptr: U32x2,
|
|
_: (),
|
|
) -> Result<i16, AnyError>
|
|
where
|
|
FP: FfiPermissions + 'static,
|
|
{
|
|
let permissions = state.borrow_mut::<FP>();
|
|
permissions.check(None)?;
|
|
|
|
Ok(unsafe { ptr::read_unaligned(u64::from(ptr) as *const i16) })
|
|
}
|
|
|
|
fn op_ffi_read_u32<FP>(
|
|
state: &mut deno_core::OpState,
|
|
ptr: U32x2,
|
|
_: (),
|
|
) -> Result<u32, AnyError>
|
|
where
|
|
FP: FfiPermissions + 'static,
|
|
{
|
|
let permissions = state.borrow_mut::<FP>();
|
|
permissions.check(None)?;
|
|
|
|
Ok(unsafe { ptr::read_unaligned(u64::from(ptr) as *const u32) })
|
|
}
|
|
|
|
fn op_ffi_read_i32<FP>(
|
|
state: &mut deno_core::OpState,
|
|
ptr: U32x2,
|
|
_: (),
|
|
) -> Result<i32, AnyError>
|
|
where
|
|
FP: FfiPermissions + 'static,
|
|
{
|
|
let permissions = state.borrow_mut::<FP>();
|
|
permissions.check(None)?;
|
|
|
|
Ok(unsafe { ptr::read_unaligned(u64::from(ptr) as *const i32) })
|
|
}
|
|
|
|
fn op_ffi_read_u64<FP>(
|
|
state: &mut deno_core::OpState,
|
|
ptr: U32x2,
|
|
_: (),
|
|
) -> Result<U32x2, AnyError>
|
|
where
|
|
FP: FfiPermissions + 'static,
|
|
{
|
|
let permissions = state.borrow_mut::<FP>();
|
|
permissions.check(None)?;
|
|
|
|
Ok(U32x2::from(unsafe {
|
|
ptr::read_unaligned(u64::from(ptr) as *const u64)
|
|
}))
|
|
}
|
|
|
|
fn op_ffi_read_f32<FP>(
|
|
state: &mut deno_core::OpState,
|
|
ptr: U32x2,
|
|
_: (),
|
|
) -> Result<f32, AnyError>
|
|
where
|
|
FP: FfiPermissions + 'static,
|
|
{
|
|
let permissions = state.borrow_mut::<FP>();
|
|
permissions.check(None)?;
|
|
|
|
Ok(unsafe { ptr::read_unaligned(u64::from(ptr) as *const f32) })
|
|
}
|
|
|
|
fn op_ffi_read_f64<FP>(
|
|
state: &mut deno_core::OpState,
|
|
ptr: U32x2,
|
|
_: (),
|
|
) -> Result<f64, AnyError>
|
|
where
|
|
FP: FfiPermissions + 'static,
|
|
{
|
|
let permissions = state.borrow_mut::<FP>();
|
|
permissions.check(None)?;
|
|
|
|
Ok(unsafe { ptr::read_unaligned(u64::from(ptr) as *const f64) })
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
#[cfg(target_os = "windows")]
|
|
#[test]
|
|
fn test_format_error() {
|
|
use super::format_error;
|
|
|
|
// BAD_EXE_FORMAT
|
|
let err = dlopen::Error::OpeningLibraryError(
|
|
std::io::Error::from_raw_os_error(0x000000C1),
|
|
);
|
|
assert_eq!(
|
|
format_error(err, "foo.dll".to_string()),
|
|
"foo.dll is not a valid Win32 application.\r\n".to_string(),
|
|
);
|
|
}
|
|
}
|