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  1. /*
  2.  * Copyright (c) 2003-2005, Francois Devaux and Antonin Descampe
  3.  * Copyright (c) 2005, Hervé Drolon, FreeImage Team
  4.  * Copyright (c) 2002-2005, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
  5.  * All rights reserved.
  6.  *
  7.  * Redistribution and use in source and binary forms, with or without
  8.  * modification, are permitted provided that the following conditions
  9.  * are met:
  10.  * 1. Redistributions of source code must retain the above copyright
  11.  *    notice, this list of conditions and the following disclaimer.
  12.  * 2. Redistributions in binary form must reproduce the above copyright
  13.  *    notice, this list of conditions and the following disclaimer in the
  14.  *    documentation and/or other materials provided with the distribution.
  15.  *
  16.  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
  17.  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18.  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19.  * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  20.  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  21.  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  22.  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  23.  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  24.  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  25.  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  26.  * POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #include "opj_includes.h"
  30.  
  31. /*
  32. ==========================================================
  33.    local functions
  34. ==========================================================
  35. */
  36.  
  37.  
  38. /*
  39. ==========================================================
  40.    RAW encoding interface
  41. ==========================================================
  42. */
  43.  
  44. opj_raw_t* raw_create() {
  45.         opj_raw_t *raw = (opj_raw_t*)opj_malloc(sizeof(opj_raw_t));
  46.         return raw;
  47. }
  48.  
  49. void raw_destroy(opj_raw_t *raw) {
  50.         if(raw) {
  51.                 opj_free(raw);
  52.         }
  53. }
  54.  
  55. int raw_numbytes(opj_raw_t *raw) {
  56.         return raw->bp - raw->start;
  57. }
  58.  
  59. void raw_init_dec(opj_raw_t *raw, unsigned char *bp, int len) {
  60.         raw->start = bp;
  61.         raw->lenmax = len;
  62.         raw->len = 0;
  63.         raw->c = 0;
  64.         raw->ct = 0;
  65. }
  66.  
  67. int raw_decode(opj_raw_t *raw) {
  68.         int d;
  69.         if (raw->ct == 0) {
  70.                 raw->ct = 8;
  71.                 if (raw->len == raw->lenmax) {
  72.                         raw->c = 0xff;
  73.                 } else {
  74.                         if (raw->c == 0xff) {
  75.                                 raw->ct = 7;
  76.                         }
  77.                         raw->c = *(raw->start + raw->len);
  78.                         raw->len++;
  79.                 }
  80.         }
  81.         raw->ct--;
  82.         d = (raw->c >> raw->ct) & 0x01;
  83.        
  84.         return d;
  85. }
  86.  
  87.