feat: Added age-ffi.

zig-vendor/age-ffi/src/memory.rs

@@ -0,0 +1,60 @@
+//! Memory management functions.
+
+use crate::types::{AgeBuffer, AgeKeypair};
+use std::ffi::CString;
+use std::os::raw::c_char;
+
+/// Free a buffer allocated by this library.
+///
+/// # Safety
+/// The buffer must have been allocated by one of the age_* functions.
+#[no_mangle]
+pub extern "C" fn age_free_buffer(buffer: *mut AgeBuffer) {
+    if buffer.is_null() {
+        return;
+    }
+
+    unsafe {
+        let buf = &*buffer;
+        if !buf.data.is_null() && buf.capacity > 0 {
+            // Reconstruct the boxed slice and drop it
+            let slice = std::slice::from_raw_parts_mut(buf.data, buf.capacity);
+            drop(Box::from_raw(slice as *mut [u8]));
+        }
+        (*buffer) = AgeBuffer::null();
+    }
+}
+
+/// Free a string allocated by this library.
+///
+/// # Safety
+/// The pointer must have been allocated by one of the age_* functions.
+#[no_mangle]
+pub extern "C" fn age_free_string(s: *mut c_char) {
+    if !s.is_null() {
+        unsafe {
+            drop(CString::from_raw(s));
+        }
+    }
+}
+
+/// Free a keypair allocated by age_generate_keypair.
+///
+/// # Safety
+/// The keypair must have been allocated by age_generate_keypair.
+#[no_mangle]
+pub extern "C" fn age_free_keypair(keypair: *mut AgeKeypair) {
+    if keypair.is_null() {
+        return;
+    }
+
+    unsafe {
+        if !(*keypair).public_key.is_null() {
+            drop(CString::from_raw((*keypair).public_key));
+        }
+        if !(*keypair).private_key.is_null() {
+            drop(CString::from_raw((*keypair).private_key));
+        }
+        (*keypair) = AgeKeypair::null();
+    }
+}