Program Listing for File file_utils.h

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

#ifndef TVM_SUPPORT_FILE_UTILS_H_
#define TVM_SUPPORT_FILE_UTILS_H_

#include <tvm/ffi/error.h>
#include <tvm/ffi/string.h>

#include <fstream>
#include <string>
#include <utility>

namespace tvm {
namespace support {

inline ffi::String GetFileFormat(const ffi::String& path, const ffi::String& format) {
  if (!format.empty()) return format;
  std::string file_name = path;
  size_t pos = file_name.find_last_of('.');
  return pos == std::string::npos ? ffi::String() : ffi::String(file_name.substr(pos + 1));
}

inline ffi::Bytes ReadBytesFromFile(const ffi::String& path) {
  std::ifstream fs(path.c_str(), std::ios::in | std::ios::binary);
  TVM_FFI_ICHECK(!fs.fail()) << "Cannot open " << path;
  fs.seekg(0, std::ios::end);
  size_t size = static_cast<size_t>(fs.tellg());
  fs.seekg(0, std::ios::beg);
  std::string data(size, '\0');
  fs.read(data.data(), size);
  return ffi::Bytes(std::move(data));
}

inline void WriteBytesToFile(const ffi::String& path, const ffi::Bytes& data) {
  std::ofstream fs(path.c_str(), std::ios::out | std::ios::binary);
  TVM_FFI_ICHECK(!fs.fail()) << "Cannot open " << path;
  fs.write(data.data(), data.size());
}

}  // namespace support
}  // namespace tvm
#endif  // TVM_SUPPORT_FILE_UTILS_H_