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https://github.com/aaru-dps/Aaru.Checksums.Native.git
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58 lines
1.4 KiB
C
58 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) 2019-2021 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 "crc16.h"
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#include "library.h"
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crc16_ctx* crc16_init(void)
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{
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crc16_ctx* ctx = (crc16_ctx*)malloc(sizeof(crc16_ctx));
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if(!ctx) return NULL;
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ctx->crc = 0x0000;
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return ctx;
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}
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int crc16_update(crc16_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) ^ crc16_table[data[i] ^ (ctx->crc & 0xFF)];
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return 0;
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}
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int crc16_final(crc16_ctx* ctx, uint16_t* crc)
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{
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if(!ctx) return -1;
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*crc = ctx->crc;
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return 0;
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}
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void crc16_free(crc16_ctx* ctx)
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{
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if(ctx) free(ctx);
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} |