wasmparser 0.4.4

A simple event-driven library for parsing WebAssembly binary files. 
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/* Copyright 2017 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#[cfg(test)]
mod simple_tests {
    use std::io::prelude::*;
    use std::fs::{File, read_dir};
    use std::path::PathBuf;
    use parser::Parser;
    use parser::ParserState;
    use parser::ParserInput;
    use parser::SectionCode;

    fn read_file_data(path: &PathBuf) -> Vec<u8> {
        println!("Parsing {:?}", path);
        let mut data = Vec::new();
        let mut f = File::open(path).ok().unwrap();
        f.read_to_end(&mut data).unwrap();
        data
    }

    #[test]
    fn it_works() {
        for entry in read_dir("tests").unwrap() {
            let data = read_file_data(&entry.unwrap().path());
            let mut parser = Parser::new(data.as_slice());
            let mut max_iteration = 100000000;
            loop {
                let state = parser.read();
                match *state {
                    ParserState::EndWasm => break,
                    ParserState::Error(msg) => panic!("Error: {}", msg),
                    _ => (),
                }
                max_iteration -= 1;
                if max_iteration == 0 {
                    panic!("Max iterations exceeded");
                }
            }
        }
    }

    macro_rules! expect_state {
        ($state:expr, $expected:pat) => ({{
            let state: &ParserState = $state;
            match *state {
                $expected => (),
                _ => panic!("Unexpected state during testing: {:?}", state)
            }
        }});
    }

    #[test]
    fn default_read() {
        let data = read_file_data(&PathBuf::from("tests/simple.wasm"));
        let mut parser = Parser::new(data.as_slice());

        expect_state!(parser.read(), ParserState::BeginWasm { .. });
        expect_state!(parser.read(), ParserState::BeginSection(SectionCode::Type));
        expect_state!(parser.read(), ParserState::TypeSectionEntry(_));
        expect_state!(parser.read(), ParserState::EndSection);
        expect_state!(parser.read(), ParserState::BeginSection(SectionCode::Function));
        expect_state!(parser.read(), ParserState::FunctionSectionEntry(_));
        expect_state!(parser.read(), ParserState::EndSection);
        expect_state!(parser.read(), ParserState::BeginSection(SectionCode::Code));
        expect_state!(parser.read(), ParserState::BeginFunctionBody(_));
        expect_state!(parser.read(), ParserState::CodeOperator(_));
        expect_state!(parser.read(), ParserState::EndFunctionBody);
        expect_state!(parser.read(), ParserState::EndSection);
        expect_state!(parser.read(), ParserState::EndWasm);
    }

    #[test]
    fn default_read_with_input() {
        let data = read_file_data(&PathBuf::from("tests/simple.wasm"));
        let mut parser = Parser::new(data.as_slice());

        expect_state!(parser.read(), ParserState::BeginWasm { .. });
        expect_state!(parser.read_with_input(ParserInput::Default),
            ParserState::BeginSection(SectionCode::Type));
        expect_state!(parser.read(), ParserState::TypeSectionEntry(_));
        expect_state!(parser.read(), ParserState::EndSection);
        expect_state!(parser.read(), ParserState::BeginSection(SectionCode::Function));
        expect_state!(parser.read_with_input(ParserInput::ReadSectionRawData),
            ParserState::SectionRawData(_));
        expect_state!(parser.read(), ParserState::EndSection);
        expect_state!(parser.read(), ParserState::BeginSection(SectionCode::Code));
        expect_state!(parser.read(), ParserState::BeginFunctionBody(_));
        expect_state!(parser.read_with_input(ParserInput::SkipFunctionBody),
            ParserState::EndFunctionBody);
        expect_state!(parser.read_with_input(ParserInput::SkipSection),
            ParserState::EndSection);
        expect_state!(parser.read(), ParserState::EndWasm);
    }
}