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|
use super::Value;
use crate::helper::{AlignExt, Endianness, ReadExt};
use crate::serialized_file::TypeTreeNode;
use anyhow::{Result, bail};
use log::trace;
use std::io::Seek;
use std::{collections::BTreeMap, io::Read};
pub fn read_value(
ty: &TypeTreeNode,
e: Endianness,
data: &mut (impl Read + Seek),
) -> Result<Value> {
let mut align = false;
let pos_before = data.stream_position()?;
let r = match ty.type_string.as_str() {
"char" => {
assert_eq!(ty.byte_size, 1);
Ok(Value::U8(data.read_u8()?))
}
"Type*" => Ok(Value::U32(data.read_u32(e)?)),
"int" => Ok(Value::I32(data.read_i32(e)?)),
"unsigned int" => Ok(Value::U32(data.read_u32(e)?)),
"UInt8" => Ok(Value::U8(data.read_u8()?)),
"UInt16" => Ok(Value::U16(data.read_u16(e)?)),
"UInt32" => Ok(Value::U32(data.read_u32(e)?)),
"UInt64" => Ok(Value::U64(data.read_u64(e)?)),
"SInt8" => Ok(Value::I8(data.read_i8()?)),
"SInt16" => Ok(Value::I16(data.read_i16(e)?)),
"SInt32" => Ok(Value::I32(data.read_i32(e)?)),
"SInt64" => Ok(Value::I64(data.read_i64(e)?)),
"bool" => Ok(Value::Bool(data.read_u8()? != 0)),
"float" => {
data.align(4)?;
Ok(Value::F32(data.read_f32(e)?))
}
"double" => {
data.align(4)?;
Ok(Value::F64(data.read_f64(e)?))
}
"string" => {
let Value::Array(arr) = read_value(&ty.children[0], e, data)? else {
unreachable!()
};
let bytes = arr
.into_iter()
.map(|e| match e {
Value::U8(x) => x,
_ => unreachable!(),
})
.collect::<Vec<_>>();
Ok(Value::String(String::from_utf8(bytes)?))
}
"Array" => {
align |= ty.children[0].post_align();
assert_eq!(ty.byte_size, -1);
let Value::I32(size) = read_value(&ty.children[0], e, data)? else {
unreachable!()
};
trace!("array of size {size}");
let mut elems = Vec::new();
for _ in 0..size {
elems.push(read_value(&ty.children[1], e, data)?);
}
Ok(Value::Array(elems))
}
"TypelessData" => {
let len = data.read_u32(e)?;
let mut buf = vec![0u8; len as usize];
data.read_exact(&mut buf)?;
Ok(Value::Typeless(buf))
}
_ => {
if ty.children.is_empty() && ty.byte_size != 0 {
todo!("need type {:?}", ty.type_string);
}
let mut fields = BTreeMap::new();
for c in &ty.children {
fields.insert(c.name_string.clone(), read_value(&c, e, data)?);
}
Ok(Value::Object {
fields,
class: ty.type_string.clone(),
})
}
};
let pos_after = data.stream_position()?;
if ty.byte_size != -1 && pos_after - pos_before < ty.byte_size as u64 {
bail!(
"did not read enough data ({} expected, {} actual)",
ty.byte_size,
pos_after - pos_before
);
}
if align || ty.post_align() {
trace!("post align");
data.align(4)?;
}
r
}
|
