aaru-dps/Aaru.Checksums.Native
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Add Fletcher-32.

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Natalia Portillo
2021-09-22 00:01:36 +01:00
parent 4e7fbac91b
commit 3431e43f1e
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 fletcher16.h fletcher16.c 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 fletcher32.h fletcher32.c library.h)

66
fletcher32.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 "fletcher32.h"
AARU_EXPORT fletcher32_ctx* AARU_CALL fletcher32_init()
{
fletcher32_ctx* ctx;
ctx = (fletcher32_ctx*)malloc(sizeof(fletcher32_ctx));
if(!ctx) return NULL;
ctx->sum1 = 0xFFFF;
ctx->sum2 = 0xFFFF;
return ctx;
}
AARU_EXPORT int AARU_CALL fletcher32_update(fletcher32_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]) % FLETCHER32_MODULE;
ctx->sum2 = (ctx->sum2 + ctx->sum1) % FLETCHER32_MODULE;
}
return 0;
}
AARU_EXPORT int AARU_CALL fletcher32_final(fletcher32_ctx* ctx, uint32_t* checksum)
{
if(!ctx) return -1;
*checksum = (ctx->sum2 << 16) | ctx->sum1;
return 0;
}
AARU_EXPORT void AARU_CALL fletcher32_free(fletcher32_ctx* ctx)
{
if(!ctx) return;
free(ctx);
}

34
fletcher32.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_FLETCHER32_H
#define AARU_CHECKSUMS_NATIVE_FLETCHER32_H
#define FLETCHER32_MODULE 0xFFFF
typedef struct {
uint16_t sum1;
uint16_t sum2;
} fletcher32_ctx;
AARU_EXPORT fletcher32_ctx* AARU_CALL fletcher32_init();
AARU_EXPORT int AARU_CALL fletcher32_update(fletcher32_ctx* ctx, const uint8_t* data, uint32_t len);
AARU_EXPORT int AARU_CALL fletcher32_final(fletcher32_ctx* ctx, uint32_t* checksum);
AARU_EXPORT void AARU_CALL fletcher32_free(fletcher32_ctx* ctx);
#endif//AARU_CHECKSUMS_NATIVE_FLETCHER32_H