raw.c revision ac3d58cff7c80b0ef56bf55130d91da17cbaa3c4 
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
51opj_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
56void opj_raw_destroy(opj_raw_t *raw) {
57	if(raw) {
58		opj_free(raw);
59	}
60}
61
62OPJ_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
68void 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
76OPJ_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