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/* Copyright 2015 OpenMarket Ltd
*
* 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
*
* http://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.
*/
#ifndef OLM_BASE64_HH_
#define OLM_BASE64_HH_
#include <cstddef>
#include <cstdint>
namespace olm {
/**
* The number of bytes of unpadded base64 needed to encode a length of input.
*/
static std::size_t encode_base64_length(
std::size_t input_length
) {
return 4 * ((input_length + 2) / 3) + (input_length + 2) % 3 - 2;
}
/**
* Encode the raw input as unpadded base64.
* Writes encode_base64_length(input_length) bytes to the output buffer.
* The input can overlap with the last three quarters of the output buffer.
* That is, the input pointer may be output + output_length - input_length.
*/
std::uint8_t * encode_base64(
std::uint8_t const * input, std::size_t input_length,
std::uint8_t * output
);
/**
* The number of bytes of raw data a length of unpadded base64 will encode to.
* Returns std::size_t(-1) if the length is not a valid length for base64.
*/
std::size_t decode_base64_length(
std::size_t input_length
);
/**
* Decodes the unpadded base64 input to raw bytes.
* Writes decode_base64_length(input_length) bytes to the output buffer.
* The output can overlap with the first three quarters of the input buffer.
* That is, the input pointers and output pointer may be the same.
*/
std::uint8_t const * decode_base64(
std::uint8_t const * input, std::size_t input_length,
std::uint8_t * output
);
} // namespace olm
#endif /* OLM_BASE64_HH_ */
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