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use super::*;
use complete::le_u8;
fn load_unsigned<'a>(mut limit: usize) -> impl Parser<&'a [u8], usize, ErrorTree<&'a [u8]>> {
move |mut input| -> IResult<&'a [u8], usize> {
let mut x = 0;
limit >>= 7;
loop {
let (rest, b) = le_u8(input)?;
input = rest;
if x >= limit {
context("integer overflow", fail::<&[u8], &str, _>)(input)?;
}
x = (x << 7) | (b as usize & 0x7f);
if b & 0x80 != 0 {
break;
}
}
Ok((input, x))
}
}
fn load_size(input: &[u8]) -> IResult<&[u8], usize> {
load_unsigned(!0).parse(input)
}
fn lua_int(input: &[u8]) -> IResult<&[u8], u64> {
map(load_unsigned(i32::MAX as _), |x| x as u64)(input)
}
fn load_string(input: &[u8]) -> IResult<&[u8], &[u8]> {
let (input, n) = load_size(input)?;
if n == 0 {
return Ok((input, &[]));
}
context("string", take(n - 1))(input)
}
fn load_upvalue(input: &[u8]) -> IResult<&[u8], UpVal> {
map(tuple((le_u8, le_u8, le_u8)), |(on_stack, id, kind)| UpVal {
on_stack: on_stack != 0,
id,
kind,
})(input)
}
fn lua_local<'a>(_header: &LuaHeader) -> impl Parser<&'a [u8], LuaLocal, ErrorTree<&'a [u8]>> {
tuple((load_string, lua_int, lua_int))
.map(|(name, start_pc, end_pc)| LuaLocal {
name: String::from_utf8_lossy(name).into(),
start_pc,
end_pc,
})
.context("local")
}
pub fn lua_chunk<'h, 'a: 'h>(
header: &'h LuaHeader,
) -> impl Parser<&'a [u8], LuaChunk, ErrorTree<&'a [u8]>> + 'h {
|input| {
let (input, (name, line_defined, last_line_defined, num_params, is_vararg, max_stack)) =
context(
"chunk header",
tuple((load_string, lua_int, lua_int, be_u8, be_u8, be_u8)),
)(input)?;
log::trace!(
"chunk: {}, line: {line_defined}-{last_line_defined}",
String::from_utf8_lossy(name)
);
map(
tuple((
length_count(lua_int.map(|x| x as usize), complete::u32(header.endian()))
.context("count instruction"),
length_count(
lua_int.map(|x| x as usize),
alt((
take_lv_nil,
take_lv_false,
take_lv_true,
take_lv_float,
take_lv_str,
take_lv_u64,
)),
)
.context("count constants"),
length_count(lua_int.map(|x| x as usize), load_upvalue).context("count upvalues"),
|i| {
length_count(lua_int.map(|x| x as usize), lua_chunk(header))
.context("count prototypes")
.parse(i)
},
length_count(lua_int.map(|x| x as usize), le_u8).context("count line info"),
length_count(
lua_int.map(|x| x as usize),
tuple((lua_int, lua_int)).map(|(a, b)| (a as u32, b as u32)),
)
.context("count source lines"),
length_count(lua_int.map(|x| x as usize), lua_local(header))
.context("count locals"),
length_count(lua_int.map(|x| x as usize), load_string.map(|v| v.to_vec()))
.context("count upval names"),
)),
move |(
instructions,
constants,
upvalues,
prototypes,
_line_info,
source_lines,
locals,
upvalue_names,
)| {
LuaChunk {
name: name.to_vec(),
line_defined,
last_line_defined,
num_upvalues: upvalues.len() as _,
flags: 0,
num_params,
is_vararg: if (is_vararg & 2) != 0 {
Some(LuaVarArgInfo {
has_arg: (is_vararg & 1) != 0,
needs_arg: (is_vararg & 4) != 0,
})
} else {
None
},
max_stack,
instructions,
constants,
prototypes,
source_lines,
locals,
upvalue_names,
num_constants: vec![],
upvalue_infos: upvalues,
}
},
)
.context("chunk")
.parse(input)
}
}
fn take_lv_nil(input: &[u8]) -> IResult<&[u8], LuaConstant> {
let (input, _) = tag(b"\0")(input)?;
Ok((input, LuaConstant::Null))
}
fn take_lv_false(input: &[u8]) -> IResult<&[u8], LuaConstant> {
let (input, _) = tag(b"\x01")(input)?;
Ok((input, LuaConstant::Bool(false)))
}
fn take_lv_true(input: &[u8]) -> IResult<&[u8], LuaConstant> {
let (input, _) = tag(b"\x11")(input)?;
Ok((input, LuaConstant::Bool(true)))
}
fn take_lv_float(input: &[u8]) -> IResult<&[u8], LuaConstant> {
let (input, (_, f)) = tuple((tag(b"\x13"), complete::le_f64))(input)?;
Ok((input, LuaConstant::Number(LuaNumber::Float(f))))
}
fn take_lv_str(input: &[u8]) -> IResult<&[u8], LuaConstant> {
let (input, (_, data)) = tuple((alt((tag(b"\x04"), tag("\x14"))), load_string))(input)?;
Ok((input, LuaConstant::String(data.to_vec().into())))
}
fn take_lv_u64(input: &[u8]) -> IResult<&[u8], LuaConstant> {
let (input, (_, val)) = tuple((tag(b"\x03"), complete::le_u64))(input)?;
Ok((input, LuaConstant::Number(LuaNumber::Integer(val as _))))
}