Simplify the code (use ctor for all targets) and add a readme

README.md

@@ -0,0 +1,51 @@
+# frida-deepfreeze-rs
+
+Have you ever written a frida script this good, that you wanted to make it permanent?
+Well, now you can!
+
+frida-deepfreeze-rs is a tool that allows you to convert your frida scripts into
+either a standalone executable that when called with a PID injects itself and runs
+the script or a shared library that can be somehow injected to a process and runs
+the script.
+
+All desktop platforms are supported (Windows, Linux, macOS).
+
+## Usage
+
+You're gonna have to compile the tool yourself as the frida script gets embedded
+at compile time.
+
+You only need a working cargo installation to compile it, it's quite simple.
+
+You can feed your script either as a string using the `FRIDA_CODE` environment
+variable or as a file using the `FRIDA_CODE_FILE` environment variable.
+
+### Standalone executable
+
+```bash
+git clone https://github.com/dzervas/frida-deepfreeze-rs
+FRIDA_CODE='console.log("Hello world from frida-deepfreeze-rs!")' cargo run --bin standalone -- 1234
+```
+
+The binary is located at `target/debug/standalone` (`.exe` for windows).
+
+### Shared library
+
+```bash
+git clone https://github.com/dzervas/frida-deepfreeze-rs
+FRIDA_CODE='console.log("Hello world from frida-deepfreeze-rs!")' cargo build --lib
+LD_PRELOAD=target/debug/libfrida_deepfreeze_rs.so cat
+# rundll32.exe target/debug/frida_deepfreeze_rs.dll,inject_self 1234 (windows equivalent)
+```
+
+The resulting library is located at `target/debug/libfrida_deepfreeze_rs.so`
+(`.dll` for windows). You can inject it using your favorite injector.
+
+There are two exported functions:
+
+```c
+void inject(uint32_t pid); // Run the frida script in the process with the given pid
+void inject_self(); // Run the frida script in the process that called the function
+```
+
+By default, on load the library will call `inject_self()`.