1 files changed, 36 insertions, 0 deletions
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/kotlin/templates/DurationHelper.kt b/third_party/rust/uniffi_bindgen/src/bindings/kotlin/templates/DurationHelper.kt
new file mode 100644
index 0000000000..4237c6f9a8
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/kotlin/templates/DurationHelper.kt
@@ -0,0 +1,36 @@
+public object FfiConverterDuration: FfiConverterRustBuffer<java.time.Duration> {
+    override fun read(buf: ByteBuffer): java.time.Duration {
+        // Type mismatch (should be u64) but we check for overflow/underflow below
+        val seconds = buf.getLong()
+        // Type mismatch (should be u32) but we check for overflow/underflow below
+        val nanoseconds = buf.getInt().toLong()
+        if (seconds < 0) {
+            throw java.time.DateTimeException("Duration exceeds minimum or maximum value supported by uniffi")
+        }
+        if (nanoseconds < 0) {
+            throw java.time.DateTimeException("Duration nanoseconds exceed minimum or maximum supported by uniffi")
+        }
+        return java.time.Duration.ofSeconds(seconds, nanoseconds)
+    }
+
+    // 8 bytes for seconds, 4 bytes for nanoseconds
+    override fun allocationSize(value: java.time.Duration) = 12
+
+    override fun write(value: java.time.Duration, buf: ByteBuffer) {
+        if (value.seconds < 0) {
+            // Rust does not support negative Durations
+            throw IllegalArgumentException("Invalid duration, must be non-negative")
+        }
+
+        if (value.nano < 0) {
+            // Java docs provide guarantee that nano will always be positive, so this should be impossible
+            // See: https://docs.oracle.com/javase/8/docs/api/java/time/Duration.html
+            throw IllegalArgumentException("Invalid duration, nano value must be non-negative")
+        }
+
+        // Type mismatch (should be u64) but since Rust doesn't support negative durations we should be OK
+        buf.putLong(value.seconds)
+        // Type mismatch (should be u32) but since values will always be between 0 and 999,999,999 it should be OK
+        buf.putInt(value.nano)
+    }
+}