testing/test_file_utils.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 "testing/test_file_utils.h"

#include <fstream>
#include <memory>
#include <sstream>
#include <string>
#include <utility>

#include "absl/status/status.h"
#include "absl/status/statusor.h"
#include "absl/strings/string_view.h"
#include "riegeli/bytes/cfile_reader.h"
#include "riegeli/bytes/reader.h"
#include "tools/cpp/runfiles/runfiles.h"

namespace credentio_testing {
namespace {

std::string GetAbsoluteFilePath(absl::string_view file_path) {
  std::string error;
  std::unique_ptr<bazel::tools::cpp::runfiles::Runfiles> runfiles(
      bazel::tools::cpp::runfiles::Runfiles::CreateForTest(&error));

  if (runfiles != nullptr) {
    return runfiles->Rlocation(std::string(file_path));
  }
  return std::string(file_path);
}

}  // namespace

absl::StatusOr<std::string> GetContents(absl::string_view file_path) {
  std::string actual_path = GetAbsoluteFilePath(file_path);

  std::ifstream f(actual_path, std::ios::binary);
  if (!f.is_open()) {
    return absl::NotFoundError("Failed to open file: " + actual_path);
  }

  std::stringstream buffer;
  buffer << f.rdbuf();
  return buffer.str();
}

absl::StatusOr<std::unique_ptr<riegeli::Reader>> GetFileReader(
    absl::string_view file_path) {
  std::string actual_path = GetAbsoluteFilePath(file_path);

  std::unique_ptr<riegeli::CFileReader<>> reader =
      std::make_unique<riegeli::CFileReader<>>(actual_path);
  if (!reader->ok()) {
    return reader->status();
  }
  return std::move(reader);
}

}  // namespace credentio_testing