text: // Copyright 2019 The MediaPipe Authors.
  //
  // 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
  //
  //      http://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.
  
  #import <Foundation/Foundation.h>
  
  #include <fstream>
  #include <sstream>
  
  #include "absl/strings/match.h"
  #include "mediapipe/framework/port/ret_check.h"
  #include "mediapipe/util/resource_util.h"
  
  namespace mediapipe {
  
  namespace {
  mediapipe::StatusOr<std::string> PathToResourceAsFileInternal(
      const std::string& path) {
    NSString* ns_path = [NSString stringWithUTF8String:path.c_str()];
    Class mediapipeGraphClass = NSClassFromString(@"MPPGraph");
    NSString* resource_dir =
        [[NSBundle bundleForClass:mediapipeGraphClass] resourcePath];
    NSString* resolved_ns_path =
        [resource_dir stringByAppendingPathComponent:ns_path];
    std::string resolved_path = [resolved_ns_path UTF8String];
    RET_CHECK([[NSFileManager defaultManager] fileExistsAtPath:resolved_ns_path])
        << "cannot find file: " << resolved_path;
    return resolved_path;
  }
  }  // namespace
  
  mediapipe::StatusOr<std::string> PathToResourceAsFile(const std::string& path) {
    // Return full path.
    if (absl::StartsWith(path, "/")) {
      return path;
    }
  
    // Try to load a relative path or a base filename as is.
    {
      auto status_or_path = PathToResourceAsFileInternal(path);
      if (status_or_path.ok()) {
        LOG(INFO) << "Successfully loaded: " << path;
        return status_or_path;
      }
    }
  
    // If that fails, assume it was a relative path, and try just the base name.
    {
      const size_t last_slash_idx = path.find_last_of("\\/");
      CHECK_NE(last_slash_idx, std::string::npos);  // Make sure it's a path.
      auto base_name = path.substr(last_slash_idx + 1);
      auto status_or_path = PathToResourceAsFileInternal(base_name);
      if (status_or_path.ok()) LOG(INFO) << "Successfully loaded: " << base_name;
      return status_or_path;
    }
  }
  
  mediapipe::Status GetResourceContents(const std::string& path,
                                        std::string* output) {
    ASSIGN_OR_RETURN(std::string full_path, PathToResourceAsFile(path));
  
    std::ifstream input_file(full_path);
    std::stringstream buffer;
    buffer << input_file.rdbuf();
    buffer.str().swap(*output);
    return mediapipe::OkStatus();
  }
  
  }  // namespace mediapipe
  