mirror of
https://github.com/fluencelabs/wasmer
synced 2024-12-15 15:15:40 +00:00
98 lines
3.5 KiB
Rust
98 lines
3.5 KiB
Rust
use byteorder::{ByteOrder, LittleEndian};
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use crate::webassembly::module::Module;
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use crate::webassembly::Instance;
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use libc::stat;
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use std::ffi::CStr;
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use std::os::raw::c_char;
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use std::slice;
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/// We check if a provided module is an Emscripten generated one
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pub fn is_emscripten_module(module: &Module) -> bool {
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for (module, _field) in &module.info.imported_funcs {
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if module == "env" {
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return true;
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}
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}
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return false;
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}
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pub unsafe fn copy_cstr_into_wasm(instance: &mut Instance, cstr: *const c_char) -> u32 {
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let s = CStr::from_ptr(cstr).to_str().unwrap();
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let space_offset = (instance.emscripten_data.as_ref().unwrap().malloc)(s.len() as _, instance);
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let raw_memory = instance.memory_offset_addr(0, space_offset as _) as *mut u8;
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let slice = slice::from_raw_parts_mut(raw_memory, s.len());
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for (byte, loc) in s.bytes().zip(slice.iter_mut()) {
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*loc = byte;
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}
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space_offset
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}
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pub unsafe fn copy_terminated_array_of_cstrs(
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_instance: &mut Instance,
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cstrs: *mut *mut c_char,
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) -> u32 {
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let total_num = {
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let mut ptr = cstrs;
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let mut counter = 0;
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while !(*ptr).is_null() {
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counter += 1;
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ptr = ptr.add(1);
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}
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counter
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};
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debug!(
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"emscripten::copy_terminated_array_of_cstrs::total_num: {}",
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total_num
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);
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0
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}
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pub unsafe fn copy_stat_into_wasm(instance: &mut Instance, buf: u32, stat: &stat) {
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let buf_ptr = instance.memory_offset_addr(0, buf as _) as *mut u8;
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let buf = slice::from_raw_parts_mut(buf_ptr, 76);
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LittleEndian::write_u32(&mut buf[..], stat.st_dev as _);
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LittleEndian::write_u32(&mut buf[4..], 0);
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LittleEndian::write_u32(&mut buf[8..], stat.st_ino as _);
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LittleEndian::write_u32(&mut buf[12..], stat.st_mode as _);
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LittleEndian::write_u32(&mut buf[16..], stat.st_nlink as _);
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LittleEndian::write_u32(&mut buf[20..], stat.st_uid);
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LittleEndian::write_u32(&mut buf[24..], stat.st_gid);
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LittleEndian::write_u32(&mut buf[28..], stat.st_rdev as _);
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LittleEndian::write_u32(&mut buf[32..], 0);
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LittleEndian::write_u32(&mut buf[36..], stat.st_size as _);
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LittleEndian::write_u32(&mut buf[40..], 4096);
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LittleEndian::write_u32(&mut buf[44..], stat.st_blocks as _);
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LittleEndian::write_u32(&mut buf[48..], stat.st_atime as _);
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LittleEndian::write_u32(&mut buf[52..], 0);
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LittleEndian::write_u32(&mut buf[56..], stat.st_mtime as _);
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LittleEndian::write_u32(&mut buf[60..], 0);
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LittleEndian::write_u32(&mut buf[64..], stat.st_ctime as _);
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LittleEndian::write_u32(&mut buf[68..], 0);
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LittleEndian::write_u32(&mut buf[72..], stat.st_ino as _);
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}
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#[cfg(test)]
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mod tests {
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use super::super::generate_emscripten_env;
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use super::is_emscripten_module;
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use crate::webassembly::instantiate;
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#[test]
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fn should_detect_emscripten_files() {
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let wasm_bytes = include_wast2wasm_bytes!("tests/is_emscripten_true.wast");
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let import_object = generate_emscripten_env();
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let result_object = instantiate(wasm_bytes, import_object).expect("Not compiled properly");
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assert!(is_emscripten_module(&result_object.module));
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}
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#[test]
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fn should_detect_non_emscripten_files() {
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let wasm_bytes = include_wast2wasm_bytes!("tests/is_emscripten_false.wast");
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let import_object = generate_emscripten_env();
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let result_object = instantiate(wasm_bytes, import_object).expect("Not compiled properly");
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assert!(!is_emscripten_module(&result_object.module));
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}
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}
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