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https://github.com/aaru-dps/Aaru.Checksums.Native.git
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68 lines
1.7 KiB
C
68 lines
1.7 KiB
C
/*
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* This file is part of the Aaru Data Preservation Suite.
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* Copyright (c) 2019-2021 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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#include <stdint.h>
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#include <stdlib.h>
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#include "library.h"
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#include "crc64.h"
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AARU_EXPORT crc64_ctx* AARU_CALL crc64_init(void)
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{
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crc64_ctx* ctx = (crc64_ctx*)malloc(sizeof(crc64_ctx));
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if(!ctx) return NULL;
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ctx->crc = CRC64_ECMA_SEED;
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for(int i = 0; i < 256; i++)
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{
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uint64_t entry = (uint64_t)i;
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for(int j = 0; j < 8; j++)
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if(entry & 1) ctx->table[i] = (entry >> 1) ^ CRC64_ECMA_POLY;
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else
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ctx->table[i] >>= 1;
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}
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return ctx;
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}
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AARU_EXPORT int AARU_CALL crc64_update(crc64_ctx* ctx, const uint8_t* data, uint32_t len)
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{
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if(!ctx || !data) return -1;
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for(uint32_t i = 0; i < len; i++) ctx->crc = (ctx->crc >> 8) ^ ctx->table[data[i] ^ (ctx->crc & 0xff)];
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return 0;
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}
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AARU_EXPORT int AARU_CALL crc64_final(crc64_ctx* ctx, uint64_t* crc)
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{
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if(!ctx) return -1;
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*crc = ctx->crc ^ CRC64_ECMA_SEED;
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return 0;
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}
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AARU_EXPORT void AARU_CALL crc64_free(crc64_ctx* ctx)
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{
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if(ctx) free(ctx);
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} |