luaur_vm/functions/
buffer_readinteger.rs

1use luaur_common::macros::luau_big_endian::LUAU_BIG_ENDIAN;
2
3use crate::functions::buffer_swapbe::buffer_swapbe;
4use crate::functions::lua_l_checkbuffer::lua_l_checkbuffer;
5use crate::functions::lua_l_checkinteger::lua_l_checkinteger;
6use crate::functions::lua_pushnumber::lua_pushnumber;
7use crate::macros::isoutofbounds::isoutofbounds;
8use crate::macros::lua_l_error::luaL_error;
9use crate::type_aliases::lua_state::lua_State;
10
11#[allow(non_snake_case)]
12pub unsafe fn buffer_readinteger<T>(L: *mut lua_State) -> core::ffi::c_int
13where
14    T: Copy + Into<f64>,
15{
16    let mut len: usize = 0;
17    let buf = lua_l_checkbuffer(L, 1, &mut len);
18    let offset = lua_l_checkinteger(L, 2);
19
20    if isoutofbounds(offset, len, core::mem::size_of::<T>()) {
21        luaL_error!(L, "buffer access out of bounds");
22    }
23
24    let mut val: T = core::mem::zeroed();
25    core::ptr::copy_nonoverlapping(
26        (buf as *const u8).add(offset as usize),
27        &mut val as *mut T as *mut u8,
28        core::mem::size_of::<T>(),
29    );
30
31    if LUAU_BIG_ENDIAN {
32        val = buffer_swapbe(val);
33    }
34
35    lua_pushnumber(L, val.into());
36    1
37}
luaur_vm/functions/buffer_readinteger.rs

luaur_vm/functions/
buffer_readinteger.rs
