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// Copyright 2020 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 "util/base64.h"
#include <stddef.h>
#include <string>
#include <utility>
#include <vector>
#include "third_party/modp_b64/modp_b64.h"
#include "util/osp_logging.h"
#include "util/std_util.h"
namespace openscreen {
namespace base64 {
std::string Encode(absl::Span<const uint8_t> input) {
return Encode(absl::string_view(reinterpret_cast<const char*>(input.data()),
input.size()));
}
std::string Encode(absl::string_view input) {
std::string out;
out.resize(modp_b64_encode_len(input.size()));
const size_t output_size =
modp_b64_encode(data(out), input.data(), input.size());
if (output_size == MODP_B64_ERROR) {
return {};
}
// The encode_len is generally larger than needed.
out.resize(output_size);
return out;
}
bool Decode(absl::string_view input, std::vector<uint8_t>* output) {
std::vector<uint8_t> out(modp_b64_decode_len(input.size()));
const size_t output_size = modp_b64_decode(
reinterpret_cast<char*>(out.data()), input.data(), input.size());
if (output_size == MODP_B64_ERROR) {
return false;
}
// The output size from decode_len is generally larger than needed.
out.resize(output_size);
*output = std::move(out);
return true;
}
} // namespace base64
} // namespace openscreen
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