hpb: introduce hpb::StatusOr<T> parse that takes in hpb::ParseOptions

hpb/BUILD

@@ -49,6 +49,7 @@ cc_library(
         ":arena",
         ":extension",
         ":multibackend",
+        ":options",
         ":ptr",
         ":status",
         "//hpb/internal",
@@ -194,3 +195,13 @@ cc_library(
         "@abseil-cpp//absl/base:core_headers",
     ],
 )
+
+cc_library(
+    name = "options",
+    hdrs = ["options.h"],
+    visibility = ["//visibility:public"],
+    deps = [
+        "//hpb:extension",
+        "//hpb:multibackend",
+    ],
+)

hpb/backend/upb/BUILD

@@ -18,8 +18,10 @@ cc_library(
         ":interop",
         "//hpb:arena",
         "//hpb:extension",
+        "//hpb:options",
         "//hpb:ptr",
         "//hpb:status",
+        "//hpb/backend:types",
         "//hpb/internal",
         "//hpb/internal:message_lock",
         "//hpb/internal:template_help",

hpb/backend/upb/upb.h

@@ -13,11 +13,13 @@
 #include "absl/status/statusor.h"
 #include "absl/strings/string_view.h"
 #include "hpb/arena.h"
+#include "hpb/backend/types.h"
 #include "hpb/backend/upb/interop.h"
 #include "hpb/extension.h"
 #include "hpb/internal/internal.h"
 #include "hpb/internal/message_lock.h"
 #include "hpb/internal/template_help.h"
+#include "hpb/options.h"
 #include "hpb/ptr.h"
 #include "hpb/status.h"
 #include "upb/mem/arena.h"
@@ -106,6 +108,24 @@ absl::StatusOr<T> Parse(absl::string_view bytes,
   return MessageDecodeError(status);
 }
 
+template <typename T>
+hpb::StatusOr<T> Parse(absl::string_view bytes, ParseOptions options) {
+  int flags = 0;
+  if (options.alias_string) {
+    flags |= kUpb_DecodeOption_AliasString;
+  }
+  T message;
+  auto* arena = interop::upb::GetArena(&message);
+  upb_DecodeStatus status = upb_Decode(
+      bytes.data(), bytes.size(), interop::upb::GetMessage(&message),
+      interop::upb::GetMiniTable(&message),
+      internal::GetUpbExtensions(options.extension_registry), flags, arena);
+  if (status == kUpb_DecodeStatus_Ok) {
+    return hpb::StatusOr<T>(std::move(message));
+  }
+  return hpb::StatusOr<T>(internal::backend::Error(status));
+}
+
 }  // namespace hpb::internal::backend::upb
 
 #include "upb/port/undef.inc"

hpb/hpb.h

@@ -17,7 +17,9 @@
 #include "hpb/extension.h"
 #include "hpb/internal/template_help.h"
 #include "hpb/multibackend.h"
+#include "hpb/options.h"
 #include "hpb/ptr.h"
+#include "hpb/status.h"
 
 #if HPB_INTERNAL_BACKEND == HPB_INTERNAL_BACKEND_UPB
 #include "hpb/backend/upb/upb.h"
@@ -70,7 +72,16 @@ ABSL_MUST_USE_RESULT bool Parse(internal::PtrOrRaw<T> message,
   return backend::Parse(message, bytes, extension_registry);
 }
 
+// Note that the default extension registry is the the generated registry.
 template <typename T>
+hpb::StatusOr<T> Parse(absl::string_view bytes, ParseOptions options) {
+  return backend::Parse<T>(bytes, options);
+}
+
+// Deprecated. Use the overload that returns hpb::StatusOr<T> instead.
+// Note that the default extension registry is the empty registry.
+template <typename T>
+ABSL_DEPRECATED("Prefer the overload that returns hpb::StatusOr<T>")
 absl::StatusOr<T> Parse(absl::string_view bytes,
                         const ExtensionRegistry& extension_registry =
                             ExtensionRegistry::empty_registry()) {

hpb/options.h

@@ -0,0 +1,50 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2025 Google LLC.  All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file or at
+// https://developers.google.com/open-source/licenses/bsd
+
+#ifndef GOOGLE_PROTOBUF_HPB_OPTIONS_H__
+#define GOOGLE_PROTOBUF_HPB_OPTIONS_H__
+
+#include "hpb/extension.h"
+#include "hpb/multibackend.h"
+
+namespace hpb {
+
+struct ParseOptions {
+  // If true, the parsed proto may alias the input string instead of copying.
+  // Aliased data could include string fields, unknown fields, and possibly
+  // other data.
+  //
+  // REQUIRES: the input string outlives the resulting proto.
+  bool alias_string = false;
+
+#if HPB_INTERNAL_BACKEND == HPB_INTERNAL_BACKEND_UPB
+  // For the upb backend, the user can determine which extension registry
+  // they wish to use. Unless there are compelling reasons to do otherwise,
+  // we recommend using the generated registry, which uses linker arrays
+  // and intelligently performs tree shaking when possible.
+  const ExtensionRegistry& extension_registry =
+      ExtensionRegistry::generated_registry();
+#endif
+};
+
+inline ParseOptions ParseOptionsDefault() { return ParseOptions(); }
+
+#if HPB_INTERNAL_BACKEND == HPB_INTERNAL_BACKEND_UPB
+// The empty registry is provided here as a convenience for extant users.
+// Prefer the generated registry.
+inline ParseOptions ParseOptionsWithEmptyRegistry() {
+  ParseOptions options{
+      .alias_string = false,
+      .extension_registry = ExtensionRegistry::empty_registry(),
+  };
+  return options;
+}
+#endif
+
+}  // namespace hpb
+
+#endif  // GOOGLE_PROTOBUF_HPB_OPTIONS_H__

hpb_generator/tests/BUILD

@@ -163,9 +163,11 @@ cc_test(
         "//hpb/backend/upb:interop",
         "//hpb:arena",
         "//hpb:extension",
+        "//hpb:options",
         "//hpb:requires",
         "//hpb:ptr",
         "//hpb:repeated_field",
+        "//hpb:status",
         "//upb/mem",
         "//upb/mini_table",
     ],
@@ -180,7 +182,9 @@ cc_test(
         "//hpb",
         "//hpb:arena",
         "//hpb:extension",
+        "//hpb:options",
         "//hpb:requires",
+        "//hpb:status",
         "//hpb/backend/upb:interop",
         "//upb/mem",
         "@abseil-cpp//absl/status:status_matchers",

hpb_generator/tests/extension_test.cc

@@ -20,7 +20,9 @@
 #include "hpb/arena.h"
 #include "hpb/backend/upb/interop.h"
 #include "hpb/hpb.h"
+#include "hpb/options.h"
 #include "hpb/requires.h"
+#include "hpb/status.h"
 #include "upb/mem/arena.h"
 
 namespace {
@@ -488,6 +490,30 @@ TEST(CppGeneratedCode, ParseWithExtensionRegistry) {
                 ->ext_name());
 }
 
+TEST(CppGeneratedCode, HpbStatusGeneratedRegistry) {
+  TestModel model;
+  ThemeExtension extension1;
+  extension1.set_ext_name("Hello World");
+  EXPECT_EQ(true, ::hpb::SetExtension(&model, ThemeExtension::theme_extension,
+                                      extension1)
+                      .ok());
+  hpb::Arena arena;
+  auto bytes = ::hpb::Serialize(&model, arena);
+  EXPECT_EQ(true, bytes.ok());
+
+  // By default, hpb::ParseOptionsDefault uses the generated registry.
+  hpb::StatusOr<TestModel> parsed_model =
+      ::hpb::Parse<TestModel>(bytes.value(), hpb::ParseOptionsDefault());
+  EXPECT_EQ(true, parsed_model.ok());
+  EXPECT_EQ(true, hpb::GetExtension(&parsed_model.value(),
+                                    ThemeExtension::theme_extension)
+                      .ok());
+  EXPECT_EQ("Hello World", hpb::GetExtension(&parsed_model.value(),
+                                             ThemeExtension::theme_extension)
+                               .value()
+                               ->ext_name());
+}
+
 TEST(CppGeneratedCode, ClearSubMessage) {
   // Fill model.
   TestModel model;

hpb_generator/tests/test_generated.cc

@@ -21,8 +21,10 @@
 #include "hpb/arena.h"
 #include "hpb/backend/upb/interop.h"
 #include "hpb/hpb.h"
+#include "hpb/options.h"
 #include "hpb/ptr.h"
 #include "hpb/requires.h"
+#include "hpb/status.h"
 
 namespace {
 
@@ -405,6 +407,30 @@ TEST(CppGeneratedCode, MessageMapStringKeyAndInt32Value) {
   EXPECT_EQ(false, result_after_delete.ok());
 }
 
+TEST(CppGeneratedCode, HpbStatus) {
+  TestModel model;
+  model.set_str1("lightweight status");
+  hpb::Arena arena;
+  absl::StatusOr<absl::string_view> bytes = ::hpb::Serialize(&model, arena);
+  EXPECT_EQ(true, bytes.ok());
+
+  hpb::StatusOr<TestModel> parsed_model = ::hpb::Parse<TestModel>(
+      bytes.value(), hpb::ParseOptionsWithEmptyRegistry());
+  EXPECT_EQ(true, parsed_model.ok());
+  EXPECT_EQ("lightweight status", parsed_model.value().str1());
+}
+
+TEST(CppGeneratedCode, HpbStatusFail) {
+  hpb::StatusOr<TestModel> status = ::hpb::Parse<TestModel>(
+      "definitely not a proto", hpb::ParseOptionsWithEmptyRegistry());
+  EXPECT_EQ(false, status.ok());
+  EXPECT_EQ(status.error(), "Wire format was corrupt");
+
+  absl::StatusOr<TestModel> to_absl_status = status.ToAbslStatusOr();
+  EXPECT_EQ(false, to_absl_status.ok());
+  EXPECT_EQ(to_absl_status.status().message(), "Wire format was corrupt");
+}
+
 TEST(CppGeneratedCode, SerializeUsingArena) {
   TestModel model;
   model.set_str1("Hello World");