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/* Copyright (c) 2011 Shlomi Fish
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* bit_rw.h - bit readers and writers. Used by delta_states.c .
*/
#ifndef FC_SOLVE_BIT_RW_H
#define FC_SOLVE_BIT_RW_H
#include "config.h"
#include "state.h"
#include "fcs_enums.h"
#include "app_str.h"
#include "unused.h"
#include "inline.h"
#define NUM_BITS_IN_BYTES 8
typedef int fc_solve_bit_data_t;
typedef unsigned char fcs_uchar_t;
typedef struct
{
fcs_uchar_t * current;
int bit_in_char_idx;
fcs_uchar_t * start;
} fc_solve_bit_writer_t;
static GCC_INLINE void fc_solve_bit_writer_init(fc_solve_bit_writer_t * writer, fcs_uchar_t * start)
{
*(writer->start = writer->current = start) = 0;
writer->bit_in_char_idx = 0;
}
static GCC_INLINE void fc_solve_bit_writer_write(fc_solve_bit_writer_t * writer, int len, fc_solve_bit_data_t data)
{
for (;len;len--,(data>>=1))
{
*(writer->current) |= ((data & 0x1) << (writer->bit_in_char_idx++));
if (writer->bit_in_char_idx == NUM_BITS_IN_BYTES)
{
*(++writer->current) = 0;
writer->bit_in_char_idx = 0;
}
}
}
typedef struct
{
const fcs_uchar_t * current;
int bit_in_char_idx;
const fcs_uchar_t * start;
} fc_solve_bit_reader_t;
static GCC_INLINE void fc_solve_bit_reader_init(fc_solve_bit_reader_t * reader, const fcs_uchar_t * start)
{
reader->start = reader->current = start;
reader->bit_in_char_idx = 0;
}
static GCC_INLINE fc_solve_bit_data_t fc_solve_bit_reader_read(fc_solve_bit_reader_t * reader, int len)
{
int idx;
fc_solve_bit_data_t ret = 0;
for (idx = 0 ; idx < len ; idx++)
{
ret |=
(
((*(reader->current) >> (reader->bit_in_char_idx++)) & 0x1)
<< idx
);
if (reader->bit_in_char_idx == NUM_BITS_IN_BYTES)
{
reader->current++;
reader->bit_in_char_idx = 0;
}
}
return ret;
}
#endif /* FC_SOLVE_BIT_RW_H */
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