89 lines
1.7 KiB
C
89 lines
1.7 KiB
C
///////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
/// \file crc64_tablegen.c
|
|
/// \brief Generate crc64_table_le.h and crc64_table_be.h
|
|
///
|
|
/// Compiling: gcc -std=c99 -o crc64_tablegen crc64_tablegen.c
|
|
/// Add -DWORDS_BIGENDIAN to generate big endian table.
|
|
//
|
|
// Author: Lasse Collin
|
|
//
|
|
// This file has been put into the public domain.
|
|
// You can do whatever you want with this file.
|
|
//
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
|
|
#include <stdio.h>
|
|
#include "tuklib_integer.h"
|
|
|
|
|
|
static uint64_t crc64_table[4][256];
|
|
|
|
|
|
extern void
|
|
init_crc64_table(void)
|
|
{
|
|
static const uint64_t poly64 = UINT64_C(0xC96C5795D7870F42);
|
|
|
|
for (size_t s = 0; s < 4; ++s) {
|
|
for (size_t b = 0; b < 256; ++b) {
|
|
uint64_t r = s == 0 ? b : crc64_table[s - 1][b];
|
|
|
|
for (size_t i = 0; i < 8; ++i) {
|
|
if (r & 1)
|
|
r = (r >> 1) ^ poly64;
|
|
else
|
|
r >>= 1;
|
|
}
|
|
|
|
crc64_table[s][b] = r;
|
|
}
|
|
}
|
|
|
|
#ifdef WORDS_BIGENDIAN
|
|
for (size_t s = 0; s < 4; ++s)
|
|
for (size_t b = 0; b < 256; ++b)
|
|
crc64_table[s][b] = bswap64(crc64_table[s][b]);
|
|
#endif
|
|
|
|
return;
|
|
}
|
|
|
|
|
|
static void
|
|
print_crc64_table(void)
|
|
{
|
|
printf("/* This file has been automatically generated by "
|
|
"crc64_tablegen.c. */\n\n"
|
|
"const uint64_t lzma_crc64_table[4][256] = {\n\t{");
|
|
|
|
for (size_t s = 0; s < 4; ++s) {
|
|
for (size_t b = 0; b < 256; ++b) {
|
|
if ((b % 2) == 0)
|
|
printf("\n\t\t");
|
|
|
|
printf("UINT64_C(0x%016" PRIX64 ")",
|
|
crc64_table[s][b]);
|
|
|
|
if (b != 255)
|
|
printf(",%s", (b+1) % 2 == 0 ? "" : " ");
|
|
}
|
|
|
|
if (s == 3)
|
|
printf("\n\t}\n};\n");
|
|
else
|
|
printf("\n\t}, {");
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
|
|
int
|
|
main(void)
|
|
{
|
|
init_crc64_table();
|
|
print_crc64_table();
|
|
return 0;
|
|
}
|