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FFI: Implement tts_default() constructor and tts_free() destructor
* tts_default() allocates a new TTS struct via it's default() constructor, returning a pointer to it or NULL on error. * tts_free(tts) destroys the TTS pointed to by tts. If tts is NULL, this function does nothing.
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src/ffi.rs
28
src/ffi.rs
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@ -5,6 +5,8 @@ use std::{
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ptr,
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ptr,
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};
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};
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use crate::TTS;
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thread_local! {
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thread_local! {
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/// Stores the last reported error, so it can be retrieved at will from C
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/// Stores the last reported error, so it can be retrieved at will from C
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static LAST_ERROR: RefCell<Option<CString>> = RefCell::new(None);
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static LAST_ERROR: RefCell<Option<CString>> = RefCell::new(None);
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@ -35,3 +37,29 @@ pub extern "C" fn tts_clear_error() {
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*err.borrow_mut() = None;
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*err.borrow_mut() = None;
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});
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});
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}
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}
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/// Creates a new TTS object with the default backend and returns a pointer to it.
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/// If an error occured, a null pointer is returned,
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/// Call `tts_get_error()` for more information about the specific error.
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#[no_mangle]
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pub extern "C" fn tts_default() -> *mut TTS {
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match TTS::default() {
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Ok(tts) => Box::into_raw(Box::new(tts)),
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Err(e) => {
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set_last_error(e.to_string()).unwrap();
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ptr::null_mut()
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}
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}
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}
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/// Frees the memory associated with a TTS object.
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/// If `tts` is a null pointer, this function does nothing.
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#[no_mangle]
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pub extern "C" fn tts_free(tts: *mut TTS) {
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if tts.is_null() {
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return;
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}
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unsafe {
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Box::from_raw(tts); // Goes out of scope and is dropped
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}
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}
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