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40 lines
1.4 KiB
C
40 lines
1.4 KiB
C
/*
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* Copyright 2024 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://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,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <stddef.h>
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#include <stdint.h>
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//! An implementation of Consistent Overhead Byte Stuffing
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//!
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//! http://conferences.sigcomm.org/sigcomm/1997/papers/p062.pdf
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//! http://en.wikipedia.org/wiki/Consistent_Overhead_Byte_Stuffing
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//! Evaluates to the offset required when encoding in-place
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#define COBS_OVERHEAD(n) (((n) + 253) / 254)
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//! Evaluates to the maximum buffer size required to hold n bytes of data
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//! after COBS encoding.
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#define MAX_SIZE_AFTER_COBS_ENCODING(n) ((n) + COBS_OVERHEAD(n))
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//! COBS-encode a buffer out to another buffer.
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//!
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//! @param [out] dst destination buffer. The buffer must be at least
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//! MAX_SIZE_AFTER_COBS_ENCODING(length) bytes long.
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//! @param [in] src source buffer
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//! @param length length of src
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size_t cobs_encode(void * restrict dst, const void * restrict src,
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size_t length);
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