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b941549573
Perhaps the generated files aren't even copyrightable but using the same license for them as for the rest of the liblzma keeps things more consistent for tools that look for license info.
121 lines
2.4 KiB
C
121 lines
2.4 KiB
C
// SPDX-License-Identifier: 0BSD
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///////////////////////////////////////////////////////////////////////////////
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//
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/// \file crc32_tablegen.c
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/// \brief Generate crc32_table_le.h and crc32_table_be.h
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///
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/// Compiling: gcc -std=c99 -o crc32_tablegen crc32_tablegen.c
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/// Add -DWORDS_BIGENDIAN to generate big endian table.
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/// Add -DLZ_HASH_TABLE to generate lz_encoder_hash_table.h (little endian).
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//
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// Author: Lasse Collin
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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 uint32_t crc32_table[8][256];
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static void
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init_crc32_table(void)
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{
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static const uint32_t poly32 = UINT32_C(0xEDB88320);
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for (size_t s = 0; s < 8; ++s) {
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for (size_t b = 0; b < 256; ++b) {
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uint32_t r = s == 0 ? b : crc32_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) ^ poly32;
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else
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r >>= 1;
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}
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crc32_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 < 8; ++s)
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for (size_t b = 0; b < 256; ++b)
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crc32_table[s][b] = bswap32(crc32_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_crc32_table(void)
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{
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// Split the SPDX string so that it won't accidentally match
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// when tools search for the string.
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printf("// SPDX" "-License-Identifier" ": 0BSD\n\n"
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"// This file has been generated by crc32_tablegen.c.\n\n"
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"const uint32_t lzma_crc32_table[8][256] = {\n\t{");
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for (size_t s = 0; s < 8; ++s) {
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for (size_t b = 0; b < 256; ++b) {
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if ((b % 4) == 0)
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printf("\n\t\t");
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printf("0x%08" PRIX32, crc32_table[s][b]);
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if (b != 255)
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printf(",%s", (b+1) % 4 == 0 ? "" : " ");
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}
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if (s == 7)
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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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static void
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print_lz_table(void)
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{
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// Split the SPDX string so that it won't accidentally match
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// when tools search for the string.
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printf("// SPDX" "-License-Identifier" ": 0BSD\n\n"
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"// This file has been generated by crc32_tablegen.c.\n\n"
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"const uint32_t lzma_lz_hash_table[256] = {");
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for (size_t b = 0; b < 256; ++b) {
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if ((b % 4) == 0)
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printf("\n\t");
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printf("0x%08" PRIX32, crc32_table[0][b]);
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if (b != 255)
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printf(",%s", (b+1) % 4 == 0 ? "" : " ");
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}
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printf("\n};\n");
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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_crc32_table();
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#ifdef LZ_HASH_TABLE
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print_lz_table();
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#else
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print_crc32_table();
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#endif
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return 0;
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}
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