1 /*
2 * The copyright in this software is being made available under the 2-clauses
3 * BSD License, included below. This software may be subject to other third
4 * party and contributor rights, including patent rights, and no such rights
5 * are granted under this license.
6 *
7 * Copyright (c) 2002-2014, Universite catholique de Louvain (UCL), Belgium
8 * Copyright (c) 2002-2014, Professor Benoit Macq
9 * Copyright (c) 2003-2007, Francois-Olivier Devaux
10 * Copyright (c) 2003-2014, Antonin Descampe
11 * Copyright (c) 2005, Herve Drolon, FreeImage Team
12 * All rights reserved.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
16 * are met:
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
24 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
27 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
33 * POSSIBILITY OF SUCH DAMAGE.
34 */
35
36 #include "opj_includes.h"
37
38 /*
39 ==========================================================
40 local functions
41 ==========================================================
42 */
43
44
45 /*
46 ==========================================================
47 RAW encoding interface
48 ==========================================================
49 */
50
opj_raw_create(void)51 opj_raw_t* opj_raw_create(void) {
52 opj_raw_t *raw = (opj_raw_t*)opj_malloc(sizeof(opj_raw_t));
53 return raw;
54 }
55
opj_raw_destroy(opj_raw_t * raw)56 void opj_raw_destroy(opj_raw_t *raw) {
57 if(raw) {
58 opj_free(raw);
59 }
60 }
61
opj_raw_numbytes(opj_raw_t * raw)62 OPJ_UINT32 opj_raw_numbytes(opj_raw_t *raw) {
63 const ptrdiff_t diff = raw->bp - raw->start;
64 assert( diff <= (ptrdiff_t)0xffffffff && diff >= 0 ); /* UINT32_MAX */
65 return (OPJ_UINT32)diff;
66 }
67
opj_raw_init_dec(opj_raw_t * raw,OPJ_BYTE * bp,OPJ_UINT32 len)68 void opj_raw_init_dec(opj_raw_t *raw, OPJ_BYTE *bp, OPJ_UINT32 len) {
69 raw->start = bp;
70 raw->lenmax = len;
71 raw->len = 0;
72 raw->c = 0;
73 raw->ct = 0;
74 }
75
opj_raw_decode(opj_raw_t * raw)76 OPJ_UINT32 opj_raw_decode(opj_raw_t *raw) {
77 OPJ_UINT32 d;
78 if (raw->ct == 0) {
79 raw->ct = 8;
80 if (raw->len == raw->lenmax) {
81 raw->c = 0xff;
82 } else {
83 if (raw->c == 0xff) {
84 raw->ct = 7;
85 }
86 raw->c = *(raw->start + raw->len);
87 raw->len++;
88 }
89 }
90 raw->ct--;
91 d = (raw->c >> raw->ct) & 0x01;
92
93 return d;
94 }
95
96