1 files changed, 24 insertions, 0 deletions
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/DurationHelper.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/DurationHelper.swift
new file mode 100644
index 0000000000..c2aa49e9d1
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/DurationHelper.swift
@@ -0,0 +1,24 @@
+fileprivate struct FfiConverterDuration: FfiConverterRustBuffer {
+    typealias SwiftType = TimeInterval
+
+    public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> TimeInterval {
+        let seconds: UInt64 = try readInt(&buf)
+        let nanoseconds: UInt32 = try readInt(&buf)
+        return Double(seconds) + (Double(nanoseconds) / 1.0e9)
+    }
+
+    public static func write(_ value: TimeInterval, into buf: inout [UInt8]) {
+        if value.rounded(.down) > Double(Int64.max) {
+            fatalError("Duration overflow, exceeds max bounds supported by Uniffi")
+        }
+
+        if value < 0 {
+            fatalError("Invalid duration, must be non-negative")
+        }
+
+        let seconds = UInt64(value)
+        let nanoseconds = UInt32((value - Double(seconds)) * 1.0e9)
+        writeInt(&buf, seconds)
+        writeInt(&buf, nanoseconds)
+    }
+}