formats/zip/constants.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_FORMATS_ZIP_CONSTANTS_H_
#define THIRD_PARTY_CREDENTIO_FORMATS_ZIP_CONSTANTS_H_

#include "absl/strings/string_view.h"

namespace credentio {

constexpr absl::string_view kZipCentralDirectorySignature = "PK\x01\x02";
constexpr absl::string_view kZipLocalFileHeaderSignature = "PK\x03\x04";
constexpr absl::string_view kZipEndOfCentralDirectorySignature = "PK\x05\x06";
constexpr absl::string_view kZipZip64EndOfCentralDirectorySignature =
    "PK\x06\x07";
constexpr absl::string_view kZipDataDescriptorSignature = "PK\x07\x08";

// Size of the data descriptor, with or without the optional signature.
constexpr int kDataDescriptorWithSignatureSize = 16;
constexpr int kDataDescriptorSize = 12;
// Size of the fixed portion of the local file header, excluding the file name
// and extra fields.
constexpr int kLocalFileHeaderFixedSize = 30;
// Size of the fixed portion of the central directory header, excluding the file
// name, extra field and file comment.
constexpr int kCentralDirectoryHeaderFixedSize = 46;
// Size of the End of Central Directory (EOCD) record.
// ZIP files based on ISO/IEC 29500:2 (OOXML) do not allow a comment field in
// the EOCD record, making it a fixed size.
constexpr int kEocdRecordSize = 22;

constexpr absl::string_view kZipManifestFileName =
    "META-INF/content_credential.c2pa";
constexpr absl::string_view kZipC2paManifestMimeType = "application/c2pa";
constexpr absl::string_view kOoxmlContentTypesFileName = "[Content_Types].xml";
}  // namespace credentio

#endif  // THIRD_PARTY_CREDENTIO_FORMATS_ZIP_CONSTANTS_H_