1 files changed, 57 insertions, 2 deletions
diff --git a/ext/digest/digest.h b/ext/digest/digest.h
index 30359ad348..c5c37583a6 100644
--- a/ext/digest/digest.h
+++ b/ext/digest/digest.h
@@ -38,9 +38,10 @@ rb_digest_##name##_update(void *ctx, unsigned char *ptr, size_t size) \
     const unsigned int stride = 16384; \
  \
     for (; size > stride; size -= stride, ptr += stride) { \
-	name##_Update(ctx, ptr, stride); \
+        name##_Update(ctx, ptr, stride); \
     } \
-    if (size > 0) name##_Update(ctx, ptr, size); \
+    /* Since size <= stride, size should fit into an unsigned int */ \
+    if (size > 0) name##_Update(ctx, ptr, (unsigned int)size); \
 }
 
 #define DEFINE_FINISH_FUNC_FROM_FINAL(name) \
@@ -49,3 +50,57 @@ rb_digest_##name##_finish(void *ctx, unsigned char *ptr) \
 { \
     return name##_Final(ptr, ctx); \
 }
+
+static inline VALUE
+rb_digest_namespace(void)
+{
+    rb_require("digest");
+    return rb_path2class("Digest");
+}
+
+static inline ID
+rb_id_metadata(void)
+{
+    return rb_intern_const("metadata");
+}
+
+#if !defined(HAVE_RB_EXT_RESOLVE_SYMBOL)
+#elif !defined(RUBY_UNTYPED_DATA_WARNING)
+# error RUBY_UNTYPED_DATA_WARNING is not defined
+#elif RUBY_UNTYPED_DATA_WARNING
+/* rb_ext_resolve_symbol() has been defined since Ruby 3.3, but digest
+ * bundled with 3.3 didn't use it. */
+# define DIGEST_USE_RB_EXT_RESOLVE_SYMBOL 1
+#endif
+
+static inline VALUE
+rb_digest_make_metadata(const rb_digest_metadata_t *meta)
+{
+#if defined(EXTSTATIC) && EXTSTATIC
+    /* The extension is built as a static library, so safe to refer to
+     * rb_digest_wrap_metadata directly. */
+    extern VALUE rb_digest_wrap_metadata(const rb_digest_metadata_t *meta);
+    return rb_digest_wrap_metadata(meta);
+#else
+    /* The extension is built as a shared library, so we can't refer
+     * to rb_digest_wrap_metadata directly. */
+# ifdef DIGEST_USE_RB_EXT_RESOLVE_SYMBOL
+    /* If rb_ext_resolve_symbol() is available, use it to get the address of
+     * rb_digest_wrap_metadata. */
+    typedef VALUE (*wrapper_func_type)(const rb_digest_metadata_t *meta);
+    static wrapper_func_type wrapper;
+    if (!wrapper) {
+        wrapper = (wrapper_func_type)(uintptr_t)
+            rb_ext_resolve_symbol("digest.so", "rb_digest_wrap_metadata");
+        if (!wrapper) rb_raise(rb_eLoadError, "rb_digest_wrap_metadata not found");
+    }
+    return wrapper(meta);
+# else
+    /* If rb_ext_resolve_symbol() is not available, keep using untyped
+     * data. */
+# undef RUBY_UNTYPED_DATA_WARNING
+# define RUBY_UNTYPED_DATA_WARNING 0
+    return rb_obj_freeze(Data_Wrap_Struct(0, 0, 0, (void *)meta));
+# endif
+#endif
+}