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38 lines
1.4 KiB
C
38 lines
1.4 KiB
C
/*
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* This file is part of the Aaru Data Preservation Suite.
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* Copyright (c) 2019-2023 Natalia Portillo.
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of the
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* License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef AARU_CHECKSUMS_NATIVE_FLETCHER16_H
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#define AARU_CHECKSUMS_NATIVE_FLETCHER16_H
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#define FLETCHER16_MODULE 0xFF
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/* NMAX is the largest n such that 255n(n+1)/2 + (n+1)(ADLER_MODULE-1) <= 2^16-1 */
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#define NMAX 22
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typedef struct
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{
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uint8_t sum1;
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uint8_t sum2;
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} fletcher16_ctx;
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AARU_EXPORT fletcher16_ctx *AARU_CALL fletcher16_init();
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AARU_EXPORT int AARU_CALL fletcher16_update(fletcher16_ctx *ctx, const uint8_t *data, uint32_t len);
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AARU_EXPORT int AARU_CALL fletcher16_final(fletcher16_ctx *ctx, uint16_t *checksum);
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AARU_EXPORT void AARU_CALL fletcher16_free(fletcher16_ctx *ctx);
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#endif // AARU_CHECKSUMS_NATIVE_FLETCHER16_H
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