mirror of https://git.tukaani.org/xz.git
93 lines
1.8 KiB
C
93 lines
1.8 KiB
C
///////////////////////////////////////////////////////////////////////////////
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//
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/// \file price_tablegen.c
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/// \brief Probability price table generator
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///
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/// Compiling: gcc -std=c99 -o price_tablegen price_tablegen.c
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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 <inttypes.h>
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#include <stdio.h>
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// Make it compile without common.h.
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#define BUILDING_PRICE_TABLEGEN
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#define lzma_attr_visibility_hidden
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#include "range_common.h"
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#include "price.h"
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static uint32_t rc_prices[RC_PRICE_TABLE_SIZE];
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static void
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init_price_table(void)
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{
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for (uint32_t i = (UINT32_C(1) << RC_MOVE_REDUCING_BITS) / 2;
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i < RC_BIT_MODEL_TOTAL;
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i += (UINT32_C(1) << RC_MOVE_REDUCING_BITS)) {
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const uint32_t cycles_bits = RC_BIT_PRICE_SHIFT_BITS;
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uint32_t w = i;
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uint32_t bit_count = 0;
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for (uint32_t j = 0; j < cycles_bits; ++j) {
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w *= w;
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bit_count <<= 1;
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while (w >= (UINT32_C(1) << 16)) {
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w >>= 1;
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++bit_count;
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}
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}
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rc_prices[i >> RC_MOVE_REDUCING_BITS]
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= (RC_BIT_MODEL_TOTAL_BITS << cycles_bits)
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- 15 - bit_count;
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}
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return;
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}
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static void
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print_price_table(void)
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{
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printf("/* This file has been automatically generated by "
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"price_tablegen.c. */\n\n"
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"#include \"range_encoder.h\"\n\n"
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"const uint8_t lzma_rc_prices["
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"RC_PRICE_TABLE_SIZE] = {");
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const size_t array_size = sizeof(lzma_rc_prices)
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/ sizeof(lzma_rc_prices[0]);
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for (size_t i = 0; i < array_size; ++i) {
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if (i % 8 == 0)
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printf("\n\t");
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printf("%4" PRIu32, rc_prices[i]);
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if (i != array_size - 1)
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printf(",");
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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_price_table();
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print_price_table();
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return 0;
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}
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