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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, Result, SectionIteratorLimited, SectionReader, SectionWithLimitedItems};
pub struct FunctionSectionReader<'a> {
reader: BinaryReader<'a>,
count: u32,
}
impl<'a> FunctionSectionReader<'a> {
pub fn new(data: &'a [u8], offset: usize) -> Result<FunctionSectionReader<'a>> {
let mut reader = BinaryReader::new_with_offset(data, offset);
let count = reader.read_var_u32()?;
Ok(FunctionSectionReader { reader, count })
}
pub fn original_position(&self) -> usize {
self.reader.original_position()
}
pub fn get_count(&self) -> u32 {
self.count
}
/// Reads function type index from the function 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;
/// let mut reader = ModuleReader::new(data).expect("module reader");
/// let section = reader.read().expect("type section");
/// let section = reader.read().expect("function section");
/// let mut function_reader = section.get_function_section_reader().expect("function section reader");
/// for _ in 0..function_reader.get_count() {
/// let ty = function_reader.read().expect("function type index");
/// println!("Function type index: {}", ty);
/// }
/// ```
pub fn read(&mut self) -> Result<u32> {
self.reader.read_var_u32()
}
}
impl<'a> SectionReader for FunctionSectionReader<'a> {
type Item = u32;
fn read(&mut self) -> Result<Self::Item> {
FunctionSectionReader::read(self)
}
fn eof(&self) -> bool {
self.reader.eof()
}
fn original_position(&self) -> usize {
FunctionSectionReader::original_position(self)
}
}
impl<'a> SectionWithLimitedItems for FunctionSectionReader<'a> {
fn get_count(&self) -> u32 {
FunctionSectionReader::get_count(self)
}
}
impl<'a> IntoIterator for FunctionSectionReader<'a> {
type Item = Result<u32>;
type IntoIter = SectionIteratorLimited<FunctionSectionReader<'a>>;
fn into_iter(self) -> Self::IntoIter {
SectionIteratorLimited::new(self)
}
}
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