bindings/bmff_exclusion_checker_test.cc

// Copyright 2026 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

#include "bindings/bmff_exclusion_checker.h"

#include <string>

#include "crypto/algorithms.h"
#include "formats/bmff/hasher.h"
#include "gtest/gtest.h"
#include "proto/bmff_based_hash_assertion.pb.h"
#include "testing/proto_test_utils.h"

namespace credentio {
namespace {

using ::credentio_testing::ParseTextProtoOrDie;

TEST(NoAdditionalExclusionsTest, NoExclusions) {
  BmffBasedHashAssertion assertion;
  EXPECT_FALSE(HasAdditionalExclusions(assertion));
}

TEST(NoAdditionalExclusionsTest, OnlyRequiredExclusions) {
  BmffBasedHashAssertion assertion =
      GetBmffHashTemplate(HashAlgorithm::kSha256);

  EXPECT_FALSE(HasAdditionalExclusions(assertion));
}

TEST(NoAdditionalExclusionsTest, WithSkipExclusion) {
  auto assertion = ParseTextProtoOrDie<BmffBasedHashAssertion>(R"pb(
    exclusions { xpath: "/skip" }
  )pb");

  EXPECT_FALSE(HasAdditionalExclusions(assertion));
}

TEST(AdditionalExclusionsTest, MerkleMapExclusionWithoutMerkleMaps) {
  BmffBasedHashAssertion assertion =
      GetBmffHashTemplate(HashAlgorithm::kSha256);
  auto exclusion = ParseTextProtoOrDie<BmffRange>(R"pb(
    xpath: "/mdat"
    subsets { offset: 16 length: 0 }
  )pb");
  *assertion.add_exclusions() = exclusion;

  EXPECT_TRUE(HasAdditionalExclusions(assertion));
}

TEST(NoAdditionalExclusionsTest, WithMerkleMaps) {
  BmffBasedHashAssertion assertion =
      GetBmffHashTemplate(HashAlgorithm::kSha256);
  auto exclusion = ParseTextProtoOrDie<BmffRange>(R"pb(
    xpath: "/mdat"
    subsets { offset: 16 length: 0 }
  )pb");
  *assertion.add_exclusions() = exclusion;
  auto merkle = ParseTextProtoOrDie<BmffMerkle>(R"pb(
    unique_id: 1
    local_id: 1
    count: 1
    alg: "sha256"
    init_hash: "\001\002\003"
    hashes: "\004\005\006"
    fixed_block_size: 1
  )pb");
  *assertion.add_merkles() = merkle;

  EXPECT_FALSE(HasAdditionalExclusions(assertion));
}

TEST(NoAdditionalExclusionsTest, ExclusionIsContainedWithinRequired) {
  auto assertion = ParseTextProtoOrDie<BmffBasedHashAssertion>(R"pb(
    exclusions { xpath: "/free[1]" }
  )pb");

  EXPECT_FALSE(HasAdditionalExclusions(assertion));
}

TEST(AdditionalExclusionsTest, ExclusionIsNotGuaranteedToBeContained) {
  auto assertion = ParseTextProtoOrDie<BmffBasedHashAssertion>(R"pb(
    exclusions { xpath: "/uuid/data" }
  )pb");

  EXPECT_TRUE(HasAdditionalExclusions(assertion));
}

TEST(AdditionalExclusionsTest, WhenHasDifferentData) {
  auto assertion = ParseTextProtoOrDie<BmffBasedHashAssertion>(R"pb(
    exclusions {
      xpath: "/uuid"
      data { offset: 0 value: "\001\002\003" }
    }
  )pb");

  EXPECT_TRUE(HasAdditionalExclusions(assertion));
}

TEST(AdditionalExclusionsTest, WhenHasDifferentSubsets) {
  auto assertion = ParseTextProtoOrDie<BmffBasedHashAssertion>(R"pb(
    exclusions {
      xpath: "/mdat"
      subsets { offset: 10 length: 4 }
    }
  )pb");

  EXPECT_TRUE(HasAdditionalExclusions(assertion));
}

TEST(AdditionalExclusionsTest, RequiredExclusionWithSubsets) {
  auto assertion = ParseTextProtoOrDie<BmffBasedHashAssertion>(R"pb(
    exclusions {
      xpath: "/uuid"
      data {
        offset: 8
        value: "\330\376\303\326\033\016H<\222\227X(\207~\304\201"
      }
      subsets { offset: 0 length: 128 }
    }
  )pb");

  EXPECT_TRUE(HasAdditionalExclusions(assertion));
}

TEST(AdditionalExclusionsTest, FtypExclusionWithSubsets) {
  auto assertion = ParseTextProtoOrDie<BmffBasedHashAssertion>(R"pb(
    exclusions {
      xpath: "/ftyp"
      subsets { offset: 0 length: 8 }
    }
  )pb");

  EXPECT_TRUE(HasAdditionalExclusions(assertion));
}

TEST(AdditionalExclusionsTest, MfraExclusionWithSubsets) {
  auto assertion = ParseTextProtoOrDie<BmffBasedHashAssertion>(R"pb(
    exclusions {
      xpath: "/mfra"
      subsets { offset: 0 length: 8 }
    }
  )pb");

  EXPECT_TRUE(HasAdditionalExclusions(assertion));
}

TEST(AdditionalExclusionsTest, FtypExclusionWithPathExtension) {
  auto assertion = ParseTextProtoOrDie<BmffBasedHashAssertion>(R"pb(
    exclusions { xpath: "/ftyp/extra" }
  )pb");

  EXPECT_TRUE(HasAdditionalExclusions(assertion));
}

TEST(AdditionalExclusionsTest, MfraExclusionWithPathExtension) {
  auto assertion = ParseTextProtoOrDie<BmffBasedHashAssertion>(R"pb(
    exclusions { xpath: "/mfra/extra" }
  )pb");

  EXPECT_TRUE(HasAdditionalExclusions(assertion));
}

}  // namespace
}  // namespace credentio