base/base64.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/base64.h"
   6
   7 #include "third_party/modp_b64/modp_b64.h"
   8
   9 namespace base {
  10
  11 bool Base64Encode(const StringPiece& input, std::string* output) {
  12   std::string temp;
  13   temp.resize(modp_b64_encode_len(input.size()));  // makes room for null byte
  14
  15   // null terminates result since result is base64 text!
  16   int input_size = static_cast<int>(input.size());
  17
  18   // modp_b64_encode_len() returns at least 1, so temp[0] is safe to use.
  19   size_t output_size = modp_b64_encode(&(temp[0]), input.data(), input_size);
  20   if (output_size == MODP_B64_ERROR)
  21     return false;
  22
  23   temp.resize(output_size);  // strips off null byte
  24   output->swap(temp);
  25   return true;
  26 }
  27
  28 bool Base64Decode(const StringPiece& input, std::string* output) {
  29   std::string temp;
  30   temp.resize(modp_b64_decode_len(input.size()));
  31
  32   // does not null terminate result since result is binary data!
  33   size_t input_size = input.size();
  34   size_t output_size = modp_b64_decode(&(temp[0]), input.data(), input_size);
  35   if (output_size == MODP_B64_ERROR)
  36     return false;
  37
  38   temp.resize(output_size);
  39   output->swap(temp);
  40   return true;
  41 }
  42
  43 }  // namespace base