aaru-dps/Aaru.Checksums.Native
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Add Fletcher-16.

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Natalia Portillo
2021-09-21 23:59:19 +01:00
parent d9b53ed189
commit 4e7fbac91b
3 changed files with 101 additions and 1 deletions
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2
CMakeLists.txt
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@@ -3,4 +3,4 @@ project("Aaru.Checksums.Native" C)
set(CMAKE_C_STANDARD 90)
add_library("Aaru.Checksums.Native" SHARED adler32.h adler32.c crc16.h crc16.c crc16_ccitt.h crc16_ccitt.c crc32.c crc32.h crc64.c crc64.h library.h)
add_library("Aaru.Checksums.Native" SHARED adler32.h adler32.c crc16.h crc16.c crc16_ccitt.h crc16_ccitt.c crc32.c crc32.h crc64.c crc64.h fletcher16.h fletcher16.c library.h)

66
fletcher16.c Normal file
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@@ -0,0 +1,66 @@
/*
* This file is part of the Aaru Data Preservation Suite.
* Copyright (c) 2019-2021 Natalia Portillo.
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of the
* License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include <stdint.h>
#include <stdlib.h>
#include "library.h"
#include "fletcher16.h"
AARU_EXPORT fletcher16_ctx* AARU_CALL fletcher16_init()
{
fletcher16_ctx* ctx;
ctx = (fletcher16_ctx*)malloc(sizeof(fletcher16_ctx));
if(!ctx) return NULL;
ctx->sum1 = 0xFF;
ctx->sum2 = 0xFF;
return ctx;
}
AARU_EXPORT int AARU_CALL fletcher16_update(fletcher16_ctx* ctx, const uint8_t* data, uint32_t len)
{
if(!ctx || !data) return -1;
for(uint32_t i = 0; i < len; i++)
{
ctx->sum1 = (ctx->sum1 + data[i]) % FLETCHER16_MODULE;
ctx->sum2 = (ctx->sum2 + ctx->sum1) % FLETCHER16_MODULE;
}
return 0;
}
AARU_EXPORT int AARU_CALL fletcher16_final(fletcher16_ctx* ctx, uint16_t* checksum)
{
if(!ctx) return -1;
*checksum = (ctx->sum2 << 8) | ctx->sum1;
return 0;
}
AARU_EXPORT void AARU_CALL fletcher16_free(fletcher16_ctx* ctx)
{
if(!ctx) return;
free(ctx);
}

34
fletcher16.h Normal file
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@@ -0,0 +1,34 @@
/*
* This file is part of the Aaru Data Preservation Suite.
* Copyright (c) 2019-2021 Natalia Portillo.
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of the
* License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef AARU_CHECKSUMS_NATIVE_FLETCHER16_H
#define AARU_CHECKSUMS_NATIVE_FLETCHER16_H
#define FLETCHER16_MODULE 0xFF
typedef struct {
uint8_t sum1;
uint8_t sum2;
} fletcher16_ctx;
AARU_EXPORT fletcher16_ctx* AARU_CALL fletcher16_init();
AARU_EXPORT int AARU_CALL fletcher16_update(fletcher16_ctx* ctx, const uint8_t* data, uint32_t len);
AARU_EXPORT int AARU_CALL fletcher16_final(fletcher16_ctx* ctx, uint16_t* checksum);
AARU_EXPORT void AARU_CALL fletcher16_free(fletcher16_ctx* ctx);
#endif//AARU_CHECKSUMS_NATIVE_FLETCHER16_H