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/**
* @file decode.c
*
* @section LICENSE
* Copyright 2012 - 2017
*
* Mathis Rosenhauer, Moritz Hanke, Joerg Behrens
* Deutsches Klimarechenzentrum GmbH
* Bundesstr. 45a
* 20146 Hamburg Germany
*
* Luis Kornblueh
* Max-Planck-Institut fuer Meteorologie
* Bundesstr. 53
* 20146 Hamburg
* Germany
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
* @section DESCRIPTION
*
* Adaptive Entropy Decoder
* Based on CCSDS documents 121.0-B-2 and 120.0-G-3
*
*/
#ifndef DECODE_H
#define DECODE_H 1
#include <config.h>
#if HAVE_STDINT_H
# include <stdint.h>
#endif
#define M_CONTINUE 1
#define M_EXIT 0
#define M_ERROR (-1)
#define MIN(a, b) (((a) < (b))? (a): (b))
#define SE_TABLE_SIZE 90
struct aec_stream;
struct internal_state {
int (*mode)(struct aec_stream *);
/* option ID */
int id;
/* bit length of code option identification key */
int id_len;
/* table maps IDs to states */
int (**id_table)(struct aec_stream *);
void (*flush_output)(struct aec_stream *);
/* previous output for post-processing */
int32_t last_out;
/* minimum integer for post-processing */
uint32_t xmin;
/* maximum integer for post-processing */
uint32_t xmax;
/* length of uncompressed input block should be the longest
legal block */
uint32_t in_blklen;
/* length of output block in bytes */
uint32_t out_blklen;
uint32_t sample_counter;
/* accumulator for currently used bit sequence */
uint64_t acc;
/* bit pointer to the next unused bit in accumulator */
int bitp;
/* last fundamental sequence in accumulator */
int fs;
/* 1 if current block has reference sample */
int ref;
/* block_size minus reference sample if present */
uint32_t encoded_block_size;
/* 1 if postprocessor has to be used */
int pp;
/* storage size of samples in bytes */
uint32_t bytes_per_sample;
/* output buffer holding one reference sample interval */
uint32_t *rsi_buffer;
/* current position of output in rsi_buffer */
uint32_t *rsip;
/* rsi in bytes */
size_t rsi_size;
/* first not yet flushed byte in rsi_buffer */
uint32_t *flush_start;
/* table for decoding second extension option */
int se_table[2 * (SE_TABLE_SIZE + 1)];
} decode_state;
#endif /* DECODE_H */
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