/*

 * Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium

 * Copyright (c) 2002-2007, Professor Benoit Macq

 * Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe

 * Copyright (c) 2005, Herve Drolon, FreeImage Team

 * 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 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.

 */

#include "opj_includes.h"

/* 

==========================================================

   local functions

==========================================================

*/

/* 

==========================================================

   RAW encoding interface

==========================================================

*/

opj_raw_t* opj_raw_create(void) {

  opj_raw_t *raw = (opj_raw_t*)opj_malloc(sizeof(opj_raw_t));

  return raw;

}

void opj_raw_destroy(opj_raw_t *raw) {

  if(raw) {

    opj_free(raw);

  }

}

OPJ_UINT32 opj_raw_numbytes(opj_raw_t *raw) {

  const ptrdiff_t diff = raw->bp - raw->start;

  assert( diff <= (ptrdiff_t)0xffffffff && diff >= 0 ); /* UINT32_MAX */

  return (OPJ_UINT32)diff;

}

void opj_raw_init_dec(opj_raw_t *raw, OPJ_BYTE *bp, OPJ_UINT32 len) {

  raw->start = bp;

  raw->lenmax = len;

  raw->len = 0;

  raw->c = 0;

  raw->ct = 0;

}

OPJ_UINT32 opj_raw_decode(opj_raw_t *raw) {

  OPJ_UINT32 d;

  if (raw->ct == 0) {

    raw->ct = 8;

    if (raw->len == raw->lenmax) {

      raw->c = 0xff;

    } else {

      if (raw->c == 0xff) {

        raw->ct = 7;

      }

      raw->c = *(raw->start + raw->len);

      raw->len++;

    }

  }

  raw->ct--;

  d = (raw->c >> raw->ct) & 0x01;

  return d;

}