openjpeg/libopenjpeg/raw.c

/*
 * Copyright (c) 2003-2005, Francois Devaux and Antonin Descampe
 * Copyright (c) 2005, Herv<EFBFBD> Drolon, FreeImage Team
 * Copyright (c) 2002-2005, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
 * 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* raw_create() {
  opj_raw_t *raw = (opj_raw_t*)opj_malloc(sizeof(opj_raw_t));
  return raw;
}

void raw_destroy(opj_raw_t *raw) {
  if(raw) {
    opj_free(raw);
  }
}

int raw_numbytes(opj_raw_t *raw) {
  return raw->bp - raw->start;
}

void raw_init_dec(opj_raw_t *raw, unsigned char *bp, int len) {
  raw->start = bp;
  raw->lenmax = len;
  raw->len = 0;
  raw->c = 0;
  raw->ct = 0;
}

int raw_decode(opj_raw_t *raw) {
  int 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;
}