formats/pdf/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_PDF_CONSTANTS_H_
#define THIRD_PARTY_CREDENTIO_FORMATS_PDF_CONSTANTS_H_

#include "absl/strings/string_view.h"

namespace credentio {

// PDF format, see ISO 32000-2 Section 7.5.2 File header.
constexpr absl::string_view kPdfFileHeader = "%PDF-";

// File trailer dictionary constants.
constexpr absl::string_view kPdfRootKey = "Root";
constexpr absl::string_view kPdfSizeKey = "Size";

// Document catalog dictionary constants.
constexpr absl::string_view kPdfAfKey = "AF";
constexpr absl::string_view kPdfNamesKey = "Names";
constexpr absl::string_view kPdfEmbeddedFilesKey = "EmbeddedFiles";

// File specification dictionary constants.
constexpr absl::string_view kPdfTypeKey = "Type";
constexpr absl::string_view kPdfFileSpecType = "Filespec";
constexpr absl::string_view kPdfSubtypeKey = "Subtype";
constexpr absl::string_view kPdfAfRelationshipKey = "AFRelationship";
constexpr absl::string_view kPdfFKey = "F";
constexpr absl::string_view kPdfUfKey = "UF";
constexpr absl::string_view kPdfEfKey = "EF";
constexpr absl::string_view kPdfParamsKey = "Params";
constexpr absl::string_view kPdfModDateKey = "ModDate";

// Page and annotation dictionary constants, see ISO 32000-2 Sections 7.7.3.3
// and 12.5.6.15.
constexpr absl::string_view kPdfAnnotsKey = "Annots";
constexpr absl::string_view kPdfFileAttachmentSubtype = "FileAttachment";
constexpr absl::string_view kPdfFsKey = "FS";

// C2PA Manifest file spec constants. See
// https://spec.c2pa.org/specifications/specifications/2.4/specs/C2PA_Specification.html#_adding_the_manifest_to_a_pdf.
constexpr absl::string_view kPdfC2paManifestMimeType = "application/c2pa";
constexpr absl::string_view kPdfC2paManifestAfRelationship = "C2PA_Manifest";
constexpr absl::string_view kPdfC2paEmbeddedFileName =
    "content_credential.c2pa";
}  // namespace credentio

#endif  // THIRD_PARTY_CREDENTIO_FORMATS_PDF_CONSTANTS_H_