feat: deno ffi bindings (#40)

* initial ts commit
* monero.ts improvements
* test on latest, build on debian:bookworm
* feat: upstream changes to bindings
* chore: update checksums
* feat: allow manually loading dylib
* chore: add readme
* fix: free strings after being read to prevent potential memory leaks
* fix: load dylib
* fix: checksum checks segfaulting because of freeing const variables

---------

Co-authored-by: Mateusz Franik <47059999+Im-Beast@users.noreply.github.com>
Co-authored-by: Im-Beast <franik.mateusz@gmail.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/impls/monero.ts/src/utils.ts b/impls/monero.ts/src/utils.ts
new file mode 100644
index 0000000..6fa640f
--- /dev/null
+++ b/impls/monero.ts/src/utils.ts
@@ -0,0 +1,25 @@
+import { dylib } from "../mod.ts";
+
+export type Sanitizer = () => void | PromiseLike<void>;
+
+const textEncoder = new TextEncoder();
+export function CString(string: string): Deno.PointerValue<string> {
+  return Deno.UnsafePointer.of(textEncoder.encode(`${string}\x00`));
+}
+
+/**
+ * This method reads string from the given pointer and frees the string.
+ *
+ * SAFETY: Do not use readCString twice on the same pointer as it will cause double free\
+ *          If you want to read CString without freeing it set the {@linkcode free} parameter to false
+ */
+export async function readCString(pointer: Deno.PointerObject, free?: boolean): Promise<string>;
+export async function readCString(pointer: Deno.PointerValue, free?: boolean): Promise<string | null>;
+export async function readCString(pointer: Deno.PointerValue, free = true): Promise<string | null> {
+  if (!pointer) return null;
+  const string = new Deno.UnsafePointerView(pointer).getCString();
+  if (free) {
+    await dylib.symbols.MONERO_free(pointer);
+  }
+  return string;
+}