use crate::{
BinaryReader, BinaryReaderError, Range, Result, SectionIteratorLimited, SectionReader,
SectionWithLimitedItems,
};
pub struct ModuleCodeSectionReader<'a> {
reader: BinaryReader<'a>,
count: u32,
}
#[derive(Debug)]
pub struct ModuleCode<'a> {
reader: BinaryReader<'a>,
}
impl<'a> ModuleCodeSectionReader<'a> {
pub fn new(data: &'a [u8], offset: usize) -> Result<ModuleCodeSectionReader<'a>> {
let mut reader = BinaryReader::new_with_offset(data, offset);
let count = reader.read_var_u32()?;
Ok(ModuleCodeSectionReader { reader, count })
}
pub fn original_position(&self) -> usize {
self.reader.original_position()
}
pub fn get_count(&self) -> u32 {
self.count
}
fn verify_module_end(&self, end: usize) -> Result<()> {
if self.reader.buffer.len() < end {
return Err(BinaryReaderError::new(
"module body extends past end of the module code section",
self.reader.original_offset + self.reader.buffer.len(),
));
}
Ok(())
}
pub fn read(&mut self) -> Result<ModuleCode<'a>> {
let size = self.reader.read_var_u32()? as usize;
let module_start = self.reader.position;
let module_end = module_start + size;
self.verify_module_end(module_end)?;
self.reader.skip_to(module_end);
Ok(ModuleCode {
reader: BinaryReader::new_with_offset(
&self.reader.buffer[module_start..module_end],
self.reader.original_offset + module_start,
),
})
}
}
impl<'a> SectionReader for ModuleCodeSectionReader<'a> {
type Item = ModuleCode<'a>;
fn read(&mut self) -> Result<Self::Item> {
ModuleCodeSectionReader::read(self)
}
fn eof(&self) -> bool {
self.reader.eof()
}
fn original_position(&self) -> usize {
ModuleCodeSectionReader::original_position(self)
}
fn range(&self) -> Range {
self.reader.range()
}
}
impl<'a> SectionWithLimitedItems for ModuleCodeSectionReader<'a> {
fn get_count(&self) -> u32 {
ModuleCodeSectionReader::get_count(self)
}
}
impl<'a> IntoIterator for ModuleCodeSectionReader<'a> {
type Item = Result<ModuleCode<'a>>;
type IntoIter = SectionIteratorLimited<ModuleCodeSectionReader<'a>>;
fn into_iter(self) -> Self::IntoIter {
SectionIteratorLimited::new(self)
}
}
impl<'a> ModuleCode<'a> {
pub fn raw_bytes(&self) -> (usize, &'a [u8]) {
(self.reader.original_position(), self.reader.buffer)
}
pub fn original_position(&self) -> usize {
self.reader.original_position()
}
}