113 lines
2.7 KiB
C
113 lines
2.7 KiB
C
/*
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* This file is a part of Pcompress, a chunked parallel multi-
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* algorithm lossless compression and decompression program.
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*
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* Copyright (C) 2012-2013 Moinak Ghosh. All rights reserved.
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* Use is subject to license terms.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but 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 program.
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* If not, see <http://www.gnu.org/licenses/>.
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*
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* moinakg@belenix.org, http://moinakg.wordpress.com/
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*
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*/
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///////////////////////////////////////////////////////////////////////////////
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//
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/// \file crc64_tablegen.c
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/// \brief Generate crc64_table_le.h and crc64_table_be.h
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///
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/// Compiling: gcc -std=c99 -o crc64_tablegen crc64_tablegen.c
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/// Add -DWORDS_BIGENDIAN to generate big endian table.
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//
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// Author: Lasse Collin
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//
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// This file has been put into the public domain.
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// You can do whatever you want with this file.
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//
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///////////////////////////////////////////////////////////////////////////////
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#include <stdio.h>
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#include "../../common/tuklib_integer.h"
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static uint64_t crc64_table[4][256];
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extern void
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init_crc64_table(void)
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{
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static const uint64_t poly64 = UINT64_C(0xC96C5795D7870F42);
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for (size_t s = 0; s < 4; ++s) {
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for (size_t b = 0; b < 256; ++b) {
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uint64_t r = s == 0 ? b : crc64_table[s - 1][b];
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for (size_t i = 0; i < 8; ++i) {
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if (r & 1)
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r = (r >> 1) ^ poly64;
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else
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r >>= 1;
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}
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crc64_table[s][b] = r;
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}
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}
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#ifdef WORDS_BIGENDIAN
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for (size_t s = 0; s < 4; ++s)
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for (size_t b = 0; b < 256; ++b)
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crc64_table[s][b] = bswap64(crc64_table[s][b]);
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#endif
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return;
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}
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static void
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print_crc64_table(void)
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{
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printf("/* This file has been automatically generated by "
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"crc64_tablegen.c. */\n\n"
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"const uint64_t lzma_crc64_table[4][256] = {\n\t{");
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for (size_t s = 0; s < 4; ++s) {
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for (size_t b = 0; b < 256; ++b) {
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if ((b % 2) == 0)
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printf("\n\t\t");
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printf("UINT64_C(0x%016" PRIX64 ")",
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crc64_table[s][b]);
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if (b != 255)
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printf(",%s", (b+1) % 2 == 0 ? "" : " ");
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}
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if (s == 3)
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printf("\n\t}\n};\n");
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else
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printf("\n\t}, {");
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}
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return;
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}
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int
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main(void)
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{
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init_crc64_table();
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print_crc64_table();
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return 0;
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}
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