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/*
* This file is part of Freecell Solver. It is subject to the license terms in
* the COPYING.txt file found in the top-level directory of this distribution
* and at http://fc-solve.shlomifish.org/docs/distro/COPYING.html . No part of
* Freecell Solver, including this file, may be copied, modified, propagated,
* or distributed except according to the terms contained in the COPYING file.
*
* Copyright (c) 2012 Shlomi Fish
*/
// var_base_reader.h - read from a packed integer using digits of variable
// bases. Also see var_base_writer.h which complements it.
#pragma once
#include "var_base_int.h"
typedef struct
{
var_base_int data;
#ifndef FCS_USE_INT128_FOR_VAR_BASE
/* To avoid memory fragmentation, we keep those here and re use them. */
var_base_int data_byte_offset;
var_base_int r;
#endif
} fcs_var_base_reader;
#ifdef FCS_USE_INT128_FOR_VAR_BASE
#define fc_solve_var_base_reader_init(s)
#else
static inline void fc_solve_var_base_reader_init(fcs_var_base_reader *const s)
{
FCS_var_base_int__init(s->data);
FCS_var_base_int__init(s->data_byte_offset);
FCS_var_base_int__init(s->r);
}
#endif
static inline void fc_solve_var_base_reader_start(fcs_var_base_reader *const s,
const unsigned char *const data, const size_t data_len)
{
FCS_var_base_int__set_ui(s->data, 0);
#define NUM_BITS 8
unsigned long shift_count = 0;
for (size_t count = 0; count < data_len; count++, shift_count += NUM_BITS)
{
#ifdef FCS_USE_INT128_FOR_VAR_BASE
s->data |= (((var_base_int)data[count]) << shift_count);
#else
FCS_var_base_int__set_ui(
s->data_byte_offset, (unsigned long)data[count]);
FCS_var_base_int__left_shift(s->data_byte_offset, shift_count);
FCS_var_base_int__add(s->data, s->data_byte_offset);
#endif
}
}
static inline unsigned long fc_solve_var_base_reader_read(
fcs_var_base_reader *const reader, const unsigned long base)
{
#ifdef FCS_USE_INT128_FOR_VAR_BASE
var_base_int rem;
#else
#define rem (reader->r)
#endif
FCS_var_base_int__mod_div(reader->data, rem, base);
return FCS_var_base_int__get_ui(rem);
#ifndef FCS_USE_INT128_FOR_VAR_BASE
#undef rem
#endif
}
#ifdef FCS_USE_INT128_FOR_VAR_BASE
#define fc_solve_var_base_reader_release(s)
#else
static inline void fc_solve_var_base_reader_release(
fcs_var_base_reader *const s)
{
FCS_var_base_int__clear(s->data);
FCS_var_base_int__clear(s->r);
FCS_var_base_int__clear(s->data_byte_offset);
}
#endif
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