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