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use crate::{BinaryReader, FromReader, OperatorsReader, Result, SectionLimited, ValType};
use std::ops::Range;
pub type CodeSectionReader<'a> = SectionLimited<'a, FunctionBody<'a>>;
#[derive(Debug, Clone)]
pub struct FunctionBody<'a> {
reader: BinaryReader<'a>,
}
impl<'a> FunctionBody<'a> {
pub fn new(offset: usize, data: &'a [u8]) -> Self {
Self {
reader: BinaryReader::new_with_offset(data, offset),
}
}
pub fn allow_memarg64(&mut self, allow: bool) {
self.reader.allow_memarg64(allow);
}
pub fn get_binary_reader(&self) -> BinaryReader<'a> {
self.reader.clone()
}
fn skip_locals(reader: &mut BinaryReader) -> Result<()> {
let count = reader.read_var_u32()?;
for _ in 0..count {
reader.read_var_u32()?;
reader.read_var_u32()?;
}
Ok(())
}
pub fn get_locals_reader(&self) -> Result<LocalsReader<'a>> {
let mut reader = self.reader.clone();
let count = reader.read_var_u32()?;
Ok(LocalsReader { reader, count })
}
pub fn get_operators_reader(&self) -> Result<OperatorsReader<'a>> {
let mut reader = self.reader.clone();
Self::skip_locals(&mut reader)?;
Ok(OperatorsReader::new(reader))
}
pub fn range(&self) -> Range<usize> {
self.reader.range()
}
}
impl<'a> FromReader<'a> for FunctionBody<'a> {
fn from_reader(reader: &mut BinaryReader<'a>) -> Result<Self> {
let reader = reader.read_reader("function body extends past end of the code section")?;
Ok(FunctionBody { reader })
}
}
pub struct LocalsReader<'a> {
reader: BinaryReader<'a>,
count: u32,
}
impl<'a> LocalsReader<'a> {
pub fn get_count(&self) -> u32 {
self.count
}
pub fn original_position(&self) -> usize {
self.reader.original_position()
}
pub fn read(&mut self) -> Result<(u32, ValType)> {
let count = self.reader.read()?;
let value_type = self.reader.read()?;
Ok((count, value_type))
}
}
impl<'a> IntoIterator for LocalsReader<'a> {
type Item = Result<(u32, ValType)>;
type IntoIter = LocalsIterator<'a>;
fn into_iter(self) -> Self::IntoIter {
let count = self.count;
LocalsIterator {
reader: self,
left: count,
err: false,
}
}
}
pub struct LocalsIterator<'a> {
reader: LocalsReader<'a>,
left: u32,
err: bool,
}
impl<'a> Iterator for LocalsIterator<'a> {
type Item = Result<(u32, ValType)>;
fn next(&mut self) -> Option<Self::Item> {
if self.err || self.left == 0 {
return None;
}
let result = self.reader.read();
self.err = result.is_err();
self.left -= 1;
Some(result)
}
fn size_hint(&self) -> (usize, Option<usize>) {
let count = self.reader.get_count() as usize;
(count, Some(count))
}
}