/*
 * Small jpeg decoder library (Internal header)
 *
 * Copyright (c) 2006, Luc Saillard <luc@saillard.org>
 * Copyright (c) 2012 Intel Corporation.
 * All rights reserved.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *  this list of conditions and the following disclaimer.
 *
 * - 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.
 *
 * - Neither the name of the author nor the names of its contributors may be
 *  used to endorse or promote products derived from this software without
 *  specific prior written permission.
 *
 * 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 OWNER 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.
 *
 */


#ifndef __TINYJPEG_INTERNAL_H_
#define __TINYJPEG_INTERNAL_H_

#include <setjmp.h>

#define SANITY_CHECK 1

struct jdec_private;

#define HUFFMAN_BITS_SIZE  256

#define HUFFMAN_TABLES     4
#define COMPONENTS     4
#define JPEG_MAX_WIDTH     2048
#define JPEG_MAX_HEIGHT    2048
#define JPEG_SCAN_MAX      4

enum std_markers {
    DQT  = 0xDB, /* Define Quantization Table */
    SOF  = 0xC0, /* Start of Frame (size information) */
    DHT  = 0xC4, /* Huffman Table */
    SOI  = 0xD8, /* Start of Image */
    SOS  = 0xDA, /* Start of Scan */
    RST  = 0xD0, /* Reset Marker d0 -> .. */
    RST7 = 0xD7, /* Reset Marker .. -> d7 */
    EOI  = 0xD9, /* End of Image */
    DRI  = 0xDD, /* Define Restart Interval */
    APP0 = 0xE0,
};


struct huffman_table {
    /*bits and values*/
    unsigned char bits[16];
    unsigned char values[256];
};

struct component {
    unsigned int Hfactor;
    unsigned int Vfactor;
    unsigned char quant_table_index;
    unsigned int cid;
};


typedef void (*decode_MCU_fct)(struct jdec_private *priv);
typedef void (*convert_colorspace_fct)(struct jdec_private *priv);

struct jpeg_sos {
    unsigned int nr_components;
    struct {
        unsigned int component_id;
        unsigned int dc_selector;
        unsigned int ac_selector;
    } components[COMPONENTS];
};

struct jdec_private {
    /* Public variables */
    unsigned int width[JPEG_SCAN_MAX], height[JPEG_SCAN_MAX]; /* Size of the image */

    /* Private variables */
    const unsigned char *stream_begin, *stream_end, *stream_scan;
    unsigned int stream_length;

    const unsigned char *stream;  /* Pointer to the current stream */

    struct component component_infos[COMPONENTS];
    unsigned int nf_components;
    unsigned char Q_tables[COMPONENTS][64];       /* quantization tables, zigzag*/
    unsigned char Q_tables_valid[COMPONENTS];
    struct huffman_table HTDC[HUFFMAN_TABLES];    /* DC huffman tables   */
    unsigned char HTDC_valid[HUFFMAN_TABLES];
    struct huffman_table HTAC[HUFFMAN_TABLES];    /* AC huffman tables   */
    unsigned char HTAC_valid[HUFFMAN_TABLES];
    struct jpeg_sos cur_sos;  /* current sos values*/
    int default_huffman_table_initialized;
    int restart_interval;
};

#endif