wasm.rs (1949B)
1 /* Copyright 2020 Mozilla Foundation 2 * 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 #[no_mangle] 17 pub unsafe extern "C" fn wasm_text_to_binary( 18 text: *const u16, 19 text_len: usize, 20 out_bytes: *mut *mut u8, 21 out_bytes_len: *mut usize, 22 out_error: *mut *mut u8, 23 out_error_len: *mut usize, 24 ) -> bool { 25 let text_slice = std::slice::from_raw_parts(text, text_len); 26 let text = String::from_utf16_lossy(text_slice); 27 28 match text_to_binary(&text) { 29 Ok(bytes) => { 30 let bytes_box = bytes.into_boxed_slice(); 31 let bytes_slice = Box::leak(bytes_box); 32 out_bytes.write(bytes_slice.as_mut_ptr()); 33 out_bytes_len.write(bytes_slice.len()); 34 true 35 } 36 Err(error) => { 37 let error = Box::leak(format!("{}\0", error).into_boxed_str()); 38 out_error.write(error.as_mut_ptr()); 39 out_error_len.write(error.len()); 40 false 41 } 42 } 43 } 44 45 fn text_to_binary(text: &str) -> Result<Vec<u8>, wast::Error> { 46 let mut lexer = wast::lexer::Lexer::new(text); 47 // The 'names.wast' spec test has confusable unicode, so disable detection. 48 // This protection is not very useful for a shell testing function anyways. 49 lexer.allow_confusing_unicode(true); 50 let buf = wast::parser::ParseBuffer::new_with_lexer(lexer)?; 51 let mut ast = wast::parser::parse::<wast::Wat>(&buf)?; 52 return ast.encode(); 53 }