feat: Expose PInvoke-able analyzers

Cargo.toml

@@ -13,6 +13,7 @@ rust-version = "1.70.0"
 [lib]
 name = "tf_demo_parser"
 path = "src/lib.rs"
+crate-type = ["lib", "cdylib"]
 
 [[bin]]
 name = "parse_demo"

src/lib.rs

@@ -3,7 +3,10 @@
 #![cfg_attr(not(test), deny(clippy::indexing_slicing))]
 #![cfg_attr(not(test), deny(clippy::panic))]
 
+use std::ffi::{c_char, CStr, CString};
+use std::fs;
 pub use bitbuffer::Result as ReadResult;
+use serde::{Deserialize, Serialize};
 
 pub use crate::demo::{
     message::MessageType,
@@ -13,6 +16,7 @@ pub use crate::demo::{
     },
     Demo, Stream,
 };
+use crate::demo::header::Header;
 
 #[cfg(feature = "codegen")]
 pub mod codegen;
@@ -85,3 +89,56 @@ fn test_roundtrip_encode<
         read.pos()
     );
 }
+
+#[derive(Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct JsonDemo {
+    header: Header,
+    #[serde(flatten)]
+    state: MatchState,
+}
+
+#[no_mangle]
+pub extern "C" fn analyze_demo(path: *const c_char) -> *mut c_char {
+    let c_str = unsafe { CStr::from_ptr(path) };
+    let str_slice = match c_str.to_str() {
+        Ok(s) => s,
+        Err(_) => return std::ptr::null_mut(),
+    };
+
+    let file = match fs::read(str_slice) {
+        Ok(f) => f,
+        Err(_) => return std::ptr::null_mut(),
+    };
+
+    let demo = Demo::new(&file);
+    let parser = DemoParser::new(demo.get_stream());
+    let (header, state) = match parser.parse() {
+        Ok(results) => results,
+        Err(_) => return std::ptr::null_mut(),
+    };
+
+    let demo_json = JsonDemo { header, state };
+    let result = match serde_json::to_string(&demo_json) {
+        Ok(json) => json,
+        Err(_) => return std::ptr::null_mut(),
+    };
+
+    // Convert the Rust string to a C string to return
+    let c_string = match CString::new(result) {
+        Ok(c_str) => c_str,
+        Err(_) => return std::ptr::null_mut(),
+    };
+
+    c_string.into_raw()
+}
+
+#[no_mangle]
+pub extern "C" fn free_string(s: *mut c_char) {
+    unsafe {
+        // Reclaim the CString to properly deallocate memory
+        if !s.is_null() {
+            let _ = CString::from_raw(s);
+        }
+    }
+}