initial commit

hkrpg/src/il2cpp_string.rs

@@ -0,0 +1,43 @@
+use std::{ffi::CString, fmt::Display};
+
+use crate::addr::{GAME_ASSEMBLY_BASE, rva_config};
+
+#[repr(transparent)]
+pub struct Il2cppString(usize);
+
+impl From<u64> for Il2cppString {
+    fn from(value: u64) -> Self {
+        Self(value as usize)
+    }
+}
+
+impl Il2cppString {
+    pub fn new(string: &str) -> Self {
+        let func = unsafe {
+            std::mem::transmute::<usize, fn(*const u8, usize) -> usize>(
+                *GAME_ASSEMBLY_BASE + rva_config().ptr_to_string_ansi,
+            )
+        };
+        let len = string.len();
+        let string = CString::new(string).unwrap();
+        let string = string.as_c_str();
+        Self(func(string.to_bytes_with_nul().as_ptr(), len))
+    }
+
+    pub fn raw(&self) -> u64 {
+        self.0 as u64
+    }
+}
+
+impl Display for Il2cppString {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        let str_length = unsafe { *(self.0.wrapping_add(16) as *const u32) };
+        let str_ptr = self.0.wrapping_add(20) as *const u8;
+        let slice = unsafe { std::slice::from_raw_parts(str_ptr, (str_length * 2) as usize) };
+        write!(
+            f,
+            "{}",
+            String::from_utf16le(slice).map_err(|_| std::fmt::Error)?
+        )
+    }
+}