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use crate::{BinaryReader, BinaryReaderError, NameMap, Result, Subsection, Subsections};
use core::ops::Range;
/// Type used to iterate and parse the contents of the `component-name` custom
/// section in compnents, similar to the `name` section of core modules.
pub type ComponentNameSectionReader<'a> = Subsections<'a, ComponentName<'a>>;
/// Represents a name read from the names custom section.
#[derive(Clone)]
#[allow(missing_docs)]
pub enum ComponentName<'a> {
Component {
name: &'a str,
name_range: Range<usize>,
},
CoreFuncs(NameMap<'a>),
CoreGlobals(NameMap<'a>),
CoreMemories(NameMap<'a>),
CoreTables(NameMap<'a>),
CoreModules(NameMap<'a>),
CoreInstances(NameMap<'a>),
CoreTypes(NameMap<'a>),
Types(NameMap<'a>),
Instances(NameMap<'a>),
Components(NameMap<'a>),
Funcs(NameMap<'a>),
Values(NameMap<'a>),
/// An unknown [name subsection](https://webassembly.github.io/spec/core/appendix/custom.html#subsections).
Unknown {
/// The identifier for this subsection.
ty: u8,
/// The contents of this subsection.
data: &'a [u8],
/// The range of bytes, relative to the start of the original data
/// stream, that the contents of this subsection reside in.
range: Range<usize>,
},
}
impl<'a> Subsection<'a> for ComponentName<'a> {
fn from_reader(id: u8, mut reader: BinaryReader<'a>) -> Result<Self> {
let data = reader.remaining_buffer();
let offset = reader.original_position();
Ok(match id {
0 => {
let name = reader.read_string()?;
if !reader.eof() {
return Err(BinaryReaderError::new(
"trailing data at the end of a name",
reader.original_position(),
));
}
ComponentName::Component {
name,
name_range: offset..reader.original_position(),
}
}
1 => {
let ctor: fn(NameMap<'a>) -> ComponentName<'a> = match reader.read_u8()? {
0x00 => match reader.read_u8()? {
0x00 => ComponentName::CoreFuncs,
0x01 => ComponentName::CoreTables,
0x02 => ComponentName::CoreMemories,
0x03 => ComponentName::CoreGlobals,
0x10 => ComponentName::CoreTypes,
0x11 => ComponentName::CoreModules,
0x12 => ComponentName::CoreInstances,
_ => {
return Ok(ComponentName::Unknown {
ty: 1,
data,
range: offset..offset + data.len(),
});
}
},
0x01 => ComponentName::Funcs,
0x02 => ComponentName::Values,
0x03 => ComponentName::Types,
0x04 => ComponentName::Components,
0x05 => ComponentName::Instances,
_ => {
return Ok(ComponentName::Unknown {
ty: 1,
data,
range: offset..offset + data.len(),
});
}
};
ctor(NameMap::new(reader.shrink())?)
}
ty => ComponentName::Unknown {
ty,
data,
range: offset..offset + data.len(),
},
})
}
}