89 lines
1.7 KiB
C
89 lines
1.7 KiB
C
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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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