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