Add C API

src/c_api.zig

@@ -0,0 +1,89 @@
+const std = @import("std");
+const zaprus = @import("zaprus");
+
+// Opaque types for C API
+const ZaprusClient = opaque {};
+const ZaprusConnection = opaque {};
+
+const alloc = std.heap.c_allocator;
+const io = std.Io.Threaded.global_single_threaded.io();
+
+export fn zaprus_init_client() ?*ZaprusClient {
+    const client = alloc.create(zaprus.Client) catch return null;
+    client.* = zaprus.Client.init() catch {
+        alloc.destroy(client);
+        return null;
+    };
+    return @ptrCast(client);
+}
+
+export fn zaprus_deinit_client(client: ?*ZaprusClient) void {
+    const c: ?*zaprus.Client = @ptrCast(@alignCast(client));
+    if (c) |zc| {
+        zc.deinit();
+        alloc.destroy(zc);
+    }
+}
+
+export fn zaprus_client_send_relay(
+    client: ?*ZaprusClient,
+    payload: [*c]const u8,
+    payload_len: usize,
+    dest: [*c]const u8,
+) c_int {
+    const c: ?*zaprus.Client = @ptrCast(@alignCast(client));
+    const zc = c orelse return 1;
+
+    zc.sendRelay(io, payload[0..payload_len], dest[0..4].*) catch return 1;
+    return 0;
+}
+
+export fn zaprus_connect(
+    client: ?*ZaprusClient,
+    payload: [*c]const u8,
+    payload_len: usize,
+) ?*ZaprusConnection {
+    const c: ?*zaprus.Client = @ptrCast(@alignCast(client));
+    const zc = c orelse return null;
+
+    const connection = alloc.create(zaprus.Connection) catch return null;
+    connection.* = zc.connect(io, payload[0..payload_len]) catch {
+        alloc.destroy(connection);
+        return null;
+    };
+    return @ptrCast(connection);
+}
+
+export fn zaprus_deinit_connection(connection: ?*ZaprusConnection) void {
+    const c: ?*zaprus.Connection = @ptrCast(@alignCast(connection));
+    if (c) |zc| {
+        zc.deinit();
+        alloc.destroy(zc);
+    }
+}
+
+export fn zaprus_connection_next(
+    connection: ?*ZaprusConnection,
+    out: [*c]u8,
+    capacity: usize,
+    out_len: *usize,
+) c_int {
+    const c: ?*zaprus.Connection = @ptrCast(@alignCast(connection));
+    const zc = c orelse return 1;
+
+    const result = zc.next(io, out[0..capacity]) catch return 1;
+    out_len.* = result.len;
+    return 0;
+}
+
+export fn zaprus_connection_send(
+    connection: ?*ZaprusConnection,
+    payload: [*c]const u8,
+    payload_len: usize,
+) c_int {
+    const c: ?*zaprus.Connection = @ptrCast(@alignCast(connection));
+    const zc = c orelse return 1;
+
+    zc.send(io, payload[0..payload_len]) catch return 1;
+    return 0;
+}