resource.hpp

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/*
 * Copyright 2020 Robert Bosch GmbH
 *
 * 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.
 *
 * SPDX-License-Identifier: Apache-2.0
 */
#pragma once
 
#include <cstddef>
#include <string>
 
#ifdef INCBIN_HDR
#error "The incbin.h header should only be included by this file."
#endif
#define INCBIN_STYLE INCBIN_STYLE_SNAKE
#define INCBIN_PREFIX _blob_
#include <incbin.h>
 
// These definitions are necessary because order of ## evaluation is undefined.
#define _BLOB_DATA(xName) _CONCAT(_BLOB_X(xName), _data)
#define _BLOB_PATH(xName) _CONCAT(_BLOB_X(xName), _path)
#define _BLOB_END(xName) _CONCAT(_BLOB_X(xName), _end)
#define _BLOB_SIZE(xName) _CONCAT(_BLOB_X(xName), _size)
#define _BLOB_X(xName) _CONCAT(_blob_, xName)
#define _CONCAT(a, b) _CONCAT2(a, b)
#define _CONCAT2(a, b) a##b
 
#define INCLUDE_RESOURCE(xName, xFilePath)   \
  const char* _BLOB_PATH(xName) = xFilePath; \
  INCBIN(xName, xFilePath)
 
#define RESOURCE(xName) \
  ::Resource(_BLOB_DATA(xName), _BLOB_END(xName), _BLOB_SIZE(xName), _BLOB_PATH(xName))
 
class Resource {
 public:
  Resource(const unsigned char* data, const unsigned char* end, const unsigned int len,
           const char* filepath)
      : data_(reinterpret_cast<const char*>(data))
      , end_(reinterpret_cast<const char*>(end))
      , size_(len)
      , filepath_(filepath) {}
 
  std::string to_string() const { return std::string(data_, size_); }
 
  size_t size() const { return size_; }
  const char* begin() const { return data_; }
  const char* end() const { return data_ + size_; }
  const char* filepath() const { return filepath_; }
 
 private:
  const char* data_;
  const char* end_;
  const size_t size_;
  const char* filepath_;
};