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use super::{
BinaryReader, ExternalKind, ImportSectionEntryType, Result, SectionIteratorLimited,
SectionReader, SectionWithLimitedItems,
};
#[derive(Debug, Copy, Clone)]
pub struct Import<'a> {
pub module: &'a [u8],
pub field: &'a [u8],
pub ty: ImportSectionEntryType,
}
pub struct ImportSectionReader<'a> {
reader: BinaryReader<'a>,
count: u32,
}
impl<'a> ImportSectionReader<'a> {
pub fn new(data: &'a [u8], offset: usize) -> Result<ImportSectionReader<'a>> {
let mut reader = BinaryReader::new_with_offset(data, offset);
let count = reader.read_var_u32()?;
Ok(ImportSectionReader { reader, count })
}
pub fn original_position(&self) -> usize {
self.reader.original_position()
}
pub fn get_count(&self) -> u32 {
self.count
}
pub fn read<'b>(&mut self) -> Result<Import<'b>>
where
'a: 'b,
{
let module = self.reader.read_string()?;
let field = self.reader.read_string()?;
let kind = self.reader.read_external_kind()?;
let ty = match kind {
ExternalKind::Function => ImportSectionEntryType::Function(self.reader.read_var_u32()?),
ExternalKind::Table => ImportSectionEntryType::Table(self.reader.read_table_type()?),
ExternalKind::Memory => ImportSectionEntryType::Memory(self.reader.read_memory_type()?),
ExternalKind::Global => ImportSectionEntryType::Global(self.reader.read_global_type()?),
};
Ok(Import { module, field, ty })
}
}
impl<'a> SectionReader for ImportSectionReader<'a> {
type Item = Import<'a>;
fn read(&mut self) -> Result<Self::Item> {
ImportSectionReader::read(self)
}
fn eof(&self) -> bool {
self.reader.eof()
}
fn original_position(&self) -> usize {
ImportSectionReader::original_position(self)
}
}
impl<'a> SectionWithLimitedItems for ImportSectionReader<'a> {
fn get_count(&self) -> u32 {
ImportSectionReader::get_count(self)
}
}
impl<'a> IntoIterator for ImportSectionReader<'a> {
type Item = Result<Import<'a>>;
type IntoIter = SectionIteratorLimited<ImportSectionReader<'a>>;
fn into_iter(self) -> Self::IntoIter {
SectionIteratorLimited::new(self)
}
}