bindings/bmff_binding_hasher.h

// 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.
//

#ifndef THIRD_PARTY_CREDENTIO_BINDINGS_BMFF_BINDING_HASHER_H_
#define THIRD_PARTY_CREDENTIO_BINDINGS_BMFF_BINDING_HASHER_H_

#include <optional>
#include <string>

#include "absl/log/die_if_null.h"
#include "bindings/binding_hasher.h"
#include "proto/bmff_based_hash_assertion.pb.h"
#include "riegeli/bytes/reader.h"

namespace credentio {
// A hasher to digest a BMFF file according to a C2PA hash assertion.
class BmffBindingHasher {
 public:
  BmffBindingHasher(const BmffBasedHashAssertion* assertion,
                    BindingHasherTracker* tracker)
      : assertion_(*ABSL_DIE_IF_NULL(assertion)),
        tracker_(*ABSL_DIE_IF_NULL(tracker)) {}
  // Digests a BMFF file according to an underlying BmffBasedHashAssertion.
  std::optional<std::string> Digest(riegeli::Reader& input) const;

 private:
  const BmffBasedHashAssertion& assertion_;
  BindingHasherTracker& tracker_;
};
}  // namespace credentio

#endif  // THIRD_PARTY_CREDENTIO_BINDINGS_BMFF_BINDING_HASHER_H_