/* * Copyright (C) 2026 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * This file is part of a native loader system that dynamically loads * another shared library at runtime and resolves its exported symbols. */
#pragma once
#ifndef PAIRIP_H
#define PAIRIP_H

#include <jni.h>
#include <dlfcn.h>
#include <stdint.h>

namespace pairipcore {
    void* H_D = nullptr;
    /*
     * Function pointers for dynamically resolved native functions
     *
     * These will be assigned at runtime using dlsym()
     * from libpairipcore_o.so
     */
    // Function ExecuteProgram
    JNIEnv* (*ExecuteProgram_func)(const char*, int64_t, uint64_t) = nullptr;
    // Standard JNI lifecycle function
    jint (*JNI_OnLoad_func)(JavaVM*, void*) = nullptr;
    // Standard JNI lifecycle function
    void (*JNI_OnUnload_func)(JavaVM*, void*) = nullptr;
    /*
     * Constructor attribute
     * This function runs automatically when the library is loaded
     * before any Java code calls into it
     */
    __attribute__((constructor, visibility("hidden")))
    static int initialize_pairipcore() {
        /*
         * Load the renamed original library into memory
         *
         * libpairipcore_o.so is expected to contain the real implementation
         */
        H_D = dlopen("libpairipcore_o.so", RTLD_LAZY | RTLD_LOCAL);
        if (!H_D) {
            return -1;
        }
        /*
         * Resolve function addresses from loaded library
         * using symbol names inside ELF symbol table
         */
        ExecuteProgram_func =
            reinterpret_cast<JNIEnv* (*)(const char*, int64_t, uint64_t)>(
                dlsym(H_D, "ExecuteProgram")
            );
        JNI_OnLoad_func =
            reinterpret_cast<jint (*)(JavaVM*, void*)>(
                dlsym(H_D, "JNI_OnLoad")
            );
        JNI_OnUnload_func =
            reinterpret_cast<void (*)(JavaVM*, void*)>(
                dlsym(H_D, "JNI_OnUnload")
            );
        /*
         * Now function pointers contain real memory addresses
         * and can be used to call native functions indirectly
         */
        return 0;
    }
} // namespace pairipcore
#endif // PAIRIP_H