Trait jni_glue::JniType

pub unsafe trait JniType {
    fn static_with_jni_type<R>(callback: impl FnOnce(&str) -> R) -> R;
}

JNI bindings rely on this type being accurate.

unsafe: static_with_jni_type must pass a string terminated by '\0'. Failing to do so is a soundness bug, as the string is passed directly to JNI as a raw pointer! Additionally, passing the wrong type may be a soundness bug as although the Android JVM will simply panic and abort, I've no idea if that's a guarantee or not.

Why the awkward callback style instead of returning &'static str? Arrays of arrays may need to dynamically construct their type strings, which would need to leak. Worse, we can't easily intern those strings via lazy_static without running into:

error[E0401]: can't use generic parameters from outer function

Required methods

fn static_with_jni_type<R>(callback: impl FnOnce(&str) -> R) -> R

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Implementations on Foreign Types

impl JniType for ()

fn static_with_jni_type<R>(callback: impl FnOnce(&str) -> R) -> R

impl JniType for bool

fn static_with_jni_type<R>(callback: impl FnOnce(&str) -> R) -> R

impl JniType for jbyte

fn static_with_jni_type<R>(callback: impl FnOnce(&str) -> R) -> R

impl JniType for jshort

fn static_with_jni_type<R>(callback: impl FnOnce(&str) -> R) -> R

impl JniType for jint

fn static_with_jni_type<R>(callback: impl FnOnce(&str) -> R) -> R

impl JniType for jlong

fn static_with_jni_type<R>(callback: impl FnOnce(&str) -> R) -> R

impl JniType for jfloat

fn static_with_jni_type<R>(callback: impl FnOnce(&str) -> R) -> R

impl JniType for jdouble

fn static_with_jni_type<R>(callback: impl FnOnce(&str) -> R) -> R

impl<'_> JniType for &'_ str

fn static_with_jni_type<R>(callback: impl FnOnce(&str) -> R) -> R

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Implementors

impl JniType for BooleanArray

fn static_with_jni_type<R>(callback: impl FnOnce(&str) -> R) -> R

impl JniType for ByteArray

fn static_with_jni_type<R>(callback: impl FnOnce(&str) -> R) -> R

impl JniType for CharArray

fn static_with_jni_type<R>(callback: impl FnOnce(&str) -> R) -> R

impl JniType for DoubleArray

fn static_with_jni_type<R>(callback: impl FnOnce(&str) -> R) -> R

impl JniType for FloatArray

fn static_with_jni_type<R>(callback: impl FnOnce(&str) -> R) -> R

impl JniType for IntArray

fn static_with_jni_type<R>(callback: impl FnOnce(&str) -> R) -> R

impl JniType for LongArray

fn static_with_jni_type<R>(callback: impl FnOnce(&str) -> R) -> R

impl JniType for ShortArray

fn static_with_jni_type<R>(callback: impl FnOnce(&str) -> R) -> R

impl JniType for jchar

fn static_with_jni_type<R>(callback: impl FnOnce(&str) -> R) -> R

impl<T: AsValidJObjectAndEnv, E: ThrowableType> JniType for ObjectArray<T, E>

fn static_with_jni_type<R>(callback: impl FnOnce(&str) -> R) -> R

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