base/base64.cc

// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/base64.h"

#include <modp_b64/modp_b64.h>

namespace base {

void Base64Encode(const StringPiece& input, std::string* output) {
  std::string temp;
  temp.resize(modp_b64_encode_len(input.size()));  // makes room for null byte

  // modp_b64_encode_len() returns at least 1, so temp[0] is safe to use.
  size_t output_size = modp_b64_encode(&(temp[0]), input.data(), input.size());

  temp.resize(output_size);  // strips off null byte
  output->swap(temp);
}

bool Base64Decode(const StringPiece& input, std::string* output) {
  std::string temp;
  temp.resize(modp_b64_decode_len(input.size()));

  // does not null terminate result since result is binary data!
  size_t input_size = input.size();
  size_t output_size = modp_b64_decode(&(temp[0]), input.data(), input_size);
  if (output_size == MODP_B64_ERROR)
    return false;

  temp.resize(output_size);
  output->swap(temp);
  return true;
}

}  // namespace base