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/* Copyright 2018 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.
*/
use super::{BinaryReader, BinaryReaderError, Operator, Result};
pub struct OperatorsReader<'a> {
reader: BinaryReader<'a>,
}
impl<'a> OperatorsReader<'a> {
pub(crate) fn new<'b>(data: &'a [u8], offset: usize) -> OperatorsReader<'b>
where
'a: 'b,
{
OperatorsReader {
reader: BinaryReader::new_with_offset(data, offset),
}
}
pub fn eof(&self) -> bool {
self.reader.eof()
}
pub fn ensure_end(&self) -> Result<()> {
if self.eof() {
return Ok(());
}
Err(BinaryReaderError {
message: "Unexpected data at the end of operators",
offset: self.reader.original_position(),
})
}
pub fn read<'b>(&mut self) -> Result<Operator<'b>>
where
'a: 'b,
{
self.reader.read_operator()
}
}
impl<'a> IntoIterator for OperatorsReader<'a> {
type Item = Result<Operator<'a>>;
type IntoIter = OperatorsIterator<'a>;
/// Reads content of the code section.
///
/// # Examples
/// ```
/// # let data: &[u8] = &[0x00, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00,
/// # 0x01, 0x4, 0x01, 0x60, 0x00, 0x00, 0x03, 0x02, 0x01, 0x00,
/// # 0x0a, 0x05, 0x01, 0x03, 0x00, 0x01, 0x0b];
/// use wasmparser::{ModuleReader, Result, Operator};
/// let mut reader = ModuleReader::new(data).expect("module reader");
/// let section = reader.read().expect("type section");
/// let section = reader.read().expect("function section");
/// let section = reader.read().expect("code section");
/// let mut code_reader = section.get_code_section_reader().expect("code section reader");
/// for _ in 0..code_reader.get_count() {
/// let body = code_reader.read().expect("function body");
/// let mut op_reader = body.get_operators_reader().expect("op reader");
/// let ops = op_reader.into_iter().collect::<Result<Vec<Operator>>>().expect("ops");
/// assert!(
/// if let [Operator::Nop, Operator::End] = ops.as_slice() { true } else { false },
/// "found {:?}",
/// ops
/// );
/// }
/// ```
fn into_iter(self) -> Self::IntoIter {
OperatorsIterator {
reader: self,
err: false,
}
}
}
pub struct OperatorsIterator<'a> {
reader: OperatorsReader<'a>,
err: bool,
}
impl<'a> Iterator for OperatorsIterator<'a> {
type Item = Result<Operator<'a>>;
fn next(&mut self) -> Option<Self::Item> {
if self.err || self.reader.eof() {
return None;
}
let result = self.reader.read();
self.err = result.is_err();
Some(result)
}
}