Add quote API

Sticky encryption rule, requiring that all replies to encrypted messages
are encrypted, applies only to messages with a quote now.

Co-Authored-By: B. Petersen <r10s@b44t.com>

deltachat-ffi/src/lib.rs

@@ -2975,6 +2975,58 @@ pub unsafe extern "C" fn dc_msg_get_error(msg: *mut dc_msg_t) -> *mut libc::c_ch
     }
 }
 
+#[no_mangle]
+pub unsafe extern "C" fn dc_msg_set_quote(msg: *mut dc_msg_t, quote: *const dc_msg_t) {
+    if msg.is_null() {
+        eprintln!("ignoring careless call to dc_msg_set_quote()");
+        return;
+    }
+    let ffi_msg = &mut *msg;
+    let ffi_quote = &*quote;
+
+    ffi_msg
+        .message
+        .set_quote(&ffi_quote.message)
+        .log_err(&*ffi_msg.context, "failed to set quote")
+        .ok();
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn dc_msg_get_quoted_text(msg: *const dc_msg_t) -> *mut libc::c_char {
+    if msg.is_null() {
+        eprintln!("ignoring careless call to dc_msg_get_quoted_text()");
+        return ptr::null_mut();
+    }
+    let ffi_msg: &MessageWrapper = &*msg;
+    ffi_msg
+        .message
+        .quoted_text()
+        .map_or_else(ptr::null_mut, |s| s.strdup())
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn dc_msg_get_quoted_msg(msg: *const dc_msg_t) -> *mut dc_msg_t {
+    if msg.is_null() {
+        eprintln!("ignoring careless call to dc_get_quoted_msg()");
+        return ptr::null_mut();
+    }
+    let ffi_msg: &MessageWrapper = &*msg;
+    let context = &*ffi_msg.context;
+    let res = block_on(async move {
+        ffi_msg
+            .message
+            .quoted_message(context)
+            .await
+            .log_err(context, "failed to get quoted message")
+            .unwrap_or(None)
+    });
+
+    match res {
+        Some(message) => Box::into_raw(Box::new(MessageWrapper { context, message })),
+        None => ptr::null_mut(),
+    }
+}
+
 // dc_contact_t
 
 /// FFI struct for [dc_contact_t]