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 void 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   // modp_b64_encode_len() returns at least 1, so temp[0] is safe to use.
  16   size_t output_size = modp_b64_encode(&(temp[0]), input.data(), input.size());
  17
  18   temp.resize(output_size);  // strips off null byte
  19   output->swap(temp);
  20 }
  21
  22 bool Base64Decode(const StringPiece& input, std::string* output) {
  23   std::string temp;
  24   temp.resize(modp_b64_decode_len(input.size()));
  25
  26   // does not null terminate result since result is binary data!
  27   size_t input_size = input.size();
  28   size_t output_size = modp_b64_decode(&(temp[0]), input.data(), input_size);
  29   if (output_size == MODP_B64_ERROR)
  30     return false;
  31
  32   temp.resize(output_size);
  33   output->swap(temp);
  34   return true;
  35 }
  36
  37 }  // namespace base