1 files changed, 74 insertions, 0 deletions
diff --git a/intl/components/src/ICU4CLibrary.h b/intl/components/src/ICU4CLibrary.h
new file mode 100644
index 0000000000..67cd1e205f
--- /dev/null
+++ b/intl/components/src/ICU4CLibrary.h
@@ -0,0 +1,74 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef intl_components_ICU4CLibrary_h
+#define intl_components_ICU4CLibrary_h
+
+#include "mozilla/intl/ICU4CGlue.h"
+#include "mozilla/Span.h"
+
+#include <stddef.h>
+
+namespace mozilla::intl {
+/**
+ * Wrapper around non-portable, ICU4C specific functions.
+ */
+class ICU4CLibrary final {
+ public:
+  ICU4CLibrary() = delete;
+
+  /**
+   * Initializes the ICU4C library.
+   *
+   * Note: This function should only be called once.
+   */
+  static ICUResult Initialize();
+
+  /**
+   * Releases any memory held by ICU. Any open ICU objects and resources are
+   * left in an undefined state after this operation.
+   *
+   * NOTE: This function is not thread-safe.
+   */
+  static void Cleanup();
+
+  struct MemoryFunctions {
+    // These are equivalent to ICU's |UMemAllocFn|, |UMemReallocFn|, and
+    // |UMemFreeFn| types. The first argument (called |context| in the ICU
+    // docs) will always be nullptr and should be ignored.
+    using AllocFn = void* (*)(const void*, size_t);
+    using ReallocFn = void* (*)(const void*, void*, size_t);
+    using FreeFn = void (*)(const void*, void*);
+
+    /**
+     * Function called when allocating memory.
+     */
+    AllocFn mAllocFn = nullptr;
+
+    /**
+     * Function called when reallocating memory.
+     */
+    ReallocFn mReallocFn = nullptr;
+
+    /**
+     * Function called when freeing memory.
+     */
+    FreeFn mFreeFn = nullptr;
+  };
+
+  /**
+   * Sets the ICU memory functions.
+   *
+   * This function can only be called before the initial call to Initialize()!
+   */
+  static ICUResult SetMemoryFunctions(MemoryFunctions aMemoryFunctions);
+
+  /**
+   * Return the ICU version number.
+   */
+  static Span<const char> GetVersion();
+};
+}  // namespace mozilla::intl
+
+#endif