57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
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///////////////////////////////////////////////////////////////////////////////
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//
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/// \file fastpos_tablegen.c
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/// \brief Generates the lzma_fastpos[] lookup table
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///
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// Authors: Igor Pavlov
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// 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 <sys/types.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include "fastpos.h"
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int
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main(void)
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{
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uint8_t fastpos[1 << FASTPOS_BITS];
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const uint8_t fast_slots = 2 * FASTPOS_BITS;
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uint32_t c = 2;
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fastpos[0] = 0;
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fastpos[1] = 1;
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for (uint8_t slot_fast = 2; slot_fast < fast_slots; ++slot_fast) {
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const uint32_t k = 1 << ((slot_fast >> 1) - 1);
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for (uint32_t j = 0; j < k; ++j, ++c)
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fastpos[c] = slot_fast;
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}
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printf("/* This file has been automatically generated "
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"by fastpos_tablegen.c. */\n\n"
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"#include \"common.h\"\n"
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"#include \"fastpos.h\"\n\n"
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"const uint8_t lzma_fastpos[1 << FASTPOS_BITS] = {");
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for (size_t i = 0; i < (1 << FASTPOS_BITS); ++i) {
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if (i % 16 == 0)
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printf("\n\t");
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printf("%3u", (unsigned int)(fastpos[i]));
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if (i != (1 << FASTPOS_BITS) - 1)
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printf(",");
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}
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printf("\n};\n");
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return 0;
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}
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