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///////////////////////////////////////////////////////////////////////////////
//
/// \file price_table_init.c
/// \brief Static initializations for the range encoder's prices array
//
// Copyright (C) 1999-2006 Igor Pavlov
// Copyright (C) 2007 Lasse Collin
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
///////////////////////////////////////////////////////////////////////////////
#ifdef HAVE_CONFIG_H
# include "range_encoder.h"
#endif
uint32_t lzma_rc_prices[RC_PRICE_TABLE_SIZE];
extern void
lzma_rc_init(void)
{
for (uint32_t i = (UINT32_C(1) << RC_MOVE_REDUCING_BITS) / 2;
i < RC_BIT_MODEL_TOTAL;
i += (UINT32_C(1) << RC_MOVE_REDUCING_BITS)) {
const uint32_t cycles_bits = RC_BIT_PRICE_SHIFT_BITS;
uint32_t w = i;
uint32_t bit_count = 0;
for (uint32_t j = 0; j < cycles_bits; ++j) {
w *= w;
bit_count <<= 1;
while (w >= (UINT32_C(1) << 16)) {
w >>= 1;
++bit_count;
}
}
lzma_rc_prices[i >> RC_MOVE_REDUCING_BITS]
= (RC_BIT_MODEL_TOTAL_BITS << cycles_bits)
- 15 - bit_count;
}
return;
}
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