blob: 42c48d4d4a984400ada096e14a8e1ea999778503 [file] [log] [blame]
// Copyright 2020 The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
#include "pw_tokenizer/base64.h"
namespace pw::tokenizer {
extern "C" size_t pw_tokenizer_PrefixedBase64Encode(
const void* binary_message,
size_t binary_size_bytes,
void* output_buffer,
size_t output_buffer_size_bytes) {
char* output = static_cast<char*>(output_buffer);
const size_t encoded_size = Base64EncodedBufferSize(binary_size_bytes);
if (output_buffer_size_bytes < encoded_size) {
if (output_buffer_size_bytes > 0u) {
output[0] = '\0';
}
return 0;
}
output[0] = kBase64Prefix;
base64::Encode(
span(static_cast<const std::byte*>(binary_message), binary_size_bytes),
&output[1]);
output[encoded_size - 1] = '\0';
return encoded_size - sizeof('\0'); // exclude the null terminator
}
extern "C" size_t pw_tokenizer_PrefixedBase64Decode(const void* base64_message,
size_t base64_size_bytes,
void* output_buffer,
size_t output_buffer_size) {
const char* base64 = static_cast<const char*>(base64_message);
if (base64_size_bytes == 0 || base64[0] != kBase64Prefix) {
return 0;
}
return base64::Decode(
std::string_view(&base64[1], base64_size_bytes - 1),
span(static_cast<std::byte*>(output_buffer), output_buffer_size));
}
} // namespace pw::tokenizer