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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, ExternalKind, ImportSectionEntryType, Result, SectionIteratorLimited,
SectionReader, SectionWithLimitedItems,
};
#[derive(Debug, Copy, Clone)]
pub struct Import<'a> {
pub module: &'a str,
pub field: &'a str,
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
}
/// Reads content of the import section.
///
/// # Examples
/// ```
/// # let data: &[u8] = &[0x00, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00,
/// # 0x01, 0x4, 0x01, 0x60, 0x00, 0x00,
/// # 0x02, 0x07, 0x01, 0x01, 0x41, 0x01, 0x66, 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("import section");
/// let mut import_reader = section.get_import_section_reader().expect("import section reader");
/// for _ in 0..import_reader.get_count() {
/// let import = import_reader.read().expect("import");
/// println!("Import: {:?}", import);
/// }
/// ```
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)
}
}