feat(native): custom font hook

native/rust/src/lib.rs

@@ -13,7 +13,7 @@ mod modules;
 
 use android_logger::Config;
 use log::LevelFilter;
-use modules::{composer_hook, duplex_hook, fstat_hook, linker_hook, sqlite_hook, unary_call_hook};
+use modules::{composer_hook, custom_font_hook, duplex_hook, fstat_hook, linker_hook, sqlite_hook, unary_call_hook};
 
 use jni::objects::{JObject, JString};
 use jni::sys::{jint, jstring, JNI_VERSION_1_6};
@@ -67,7 +67,8 @@ fn init(mut env: JNIEnv, _class: JObject, signature_cache: JString) -> jstring {
         unary_call_hook::init(),
         composer_hook::init(),
         fstat_hook::init(),
-        sqlite_hook::init()
+        sqlite_hook::init(),
+        custom_font_hook::init()
     );
     
     threads.into_iter().for_each(|t| t.join().unwrap());

native/rust/src/modules/custom_font_hook.rs

@@ -0,0 +1,31 @@
+use std::{ffi::CStr, fs};
+
+use crate::{config, def_hook, dobby_hook_sym};
+
+def_hook!(
+    open_hook,
+    i32,
+    |path: *const u8, flags: i32| {
+        let mut path = path;
+        
+        if let Ok(pathname) = CStr::from_ptr(path).to_str() {
+            if pathname == "/system/fonts/NotoColorEmoji.ttf"  {
+                if let Some(font_path) = config::native_config().custom_emoji_font_path {
+                    if fs::metadata(&font_path).is_ok() {
+                        path = (font_path.to_owned() + "\0").as_ptr();
+                        debug!("open {}", font_path);
+                    } else {
+                        warn!("custom emoji font path does not exist: {}", font_path);
+                    }
+                }
+            }
+        }
+
+        open_hook_original.unwrap()(path, flags)
+    }
+);
+
+
+pub fn init() {
+    dobby_hook_sym!("libc.so", "open", open_hook);
+}

native/rust/src/modules/linker_hook.rs

@@ -15,7 +15,7 @@ def_hook!(
         let pathname_str = CStr::from_ptr(pathname).to_str().unwrap().to_string();
 
         if let Some(content) = SHARED_LIBRARIES.lock().unwrap().remove(&pathname_str) {
-            let memfd = libc::syscall(libc::SYS_memfd_create, "me.rhunk.snapenhance\0".as_ptr(), 0) as i32;
+            let memfd = libc::syscall(libc::SYS_memfd_create, "jit-cache\0".as_ptr(), 0) as i32;
             let content = content.into_boxed_slice();
             
             if libc::write(memfd, content.as_ptr() as *const c_void, content.len() as libc::size_t) == -1 {

native/rust/src/modules/mod.rs

@@ -4,3 +4,4 @@ pub mod sqlite_hook;
 pub mod fstat_hook;
 pub mod unary_call_hook;
 pub mod composer_hook;
+pub mod custom_font_hook;