////////////////////////////////////////////////////////////////////////////////
// Copyright 2016 Google LLC.
//
// This software is licensed under the terms defined in the Widevine Master
// License Agreement. For a copy of this agreement, please contact
// widevine-licensing@google.com.
////////////////////////////////////////////////////////////////////////////////

#include "common/file_util.h"

#include <stddef.h>
#include <stdio.h>

#include "glog/logging.h"

namespace widevine {

bool GetContents(const std::string& file_name, std::string* contents) {
  if (file_name.empty()) {
    LOG(WARNING) << "File name is empty.";
    return false;
  }
  FILE* file = fopen(file_name.c_str(), "r");
  if (!file) {
    LOG(WARNING) << "Unable to open file " << file_name;
    return false;
  }
  contents->clear();
  const size_t kReadSize = 0x1000;
  char buffer[kReadSize];
  while (true) {
    size_t size_read = fread(buffer, sizeof(char), kReadSize, file);
    if (size_read == 0) break;
    contents->append(buffer, size_read);
  }
  const bool eof = feof(file);
  fclose(file);
  if (!eof) {
    LOG(WARNING) << "Failed to read all file contents.";
    return false;
  }
  return true;;
}

bool SetContents(const std::string& file_name, const std::string& contents) {
  if (file_name.empty()) {
    LOG(WARNING) << "File name is empty.";
    return false;
  }
  FILE* file = fopen(file_name.c_str(), "w");
  if (!file) {
    LOG(WARNING) << "Unable to open file " << file_name;
    return false;
  }
  const size_t size_written =
      fwrite(contents.data(), sizeof(char), contents.size(), file);
  if (size_written != contents.size())
    LOG(WARNING) << "Failed to write to " << file_name;
  fclose(file);
  return size_written == contents.size();
}

}  // namespace widevine