1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
|
/*
* Copyright (c) 1999-2000 Image Power, Inc. and the University of
* British Columbia.
* Copyright (c) 2001-2002 Michael David Adams.
* All rights reserved.
*/
/* __START_OF_JASPER_LICENSE__
*
* JasPer License Version 2.0
*
* Copyright (c) 2001-2006 Michael David Adams
* Copyright (c) 1999-2000 Image Power, Inc.
* Copyright (c) 1999-2000 The University of British Columbia
*
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person (the
* "User") obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, and/or sell copies of the Software, and to permit
* persons to whom the Software is furnished to do so, subject to the
* following conditions:
*
* 1. The above copyright notices and this permission notice (which
* includes the disclaimer below) shall be included in all copies or
* substantial portions of the Software.
*
* 2. The name of a copyright holder shall not be used to endorse or
* promote products derived from the Software without specific prior
* written permission.
*
* THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS
* LICENSE. NO USE OF THE SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER
* THIS DISCLAIMER. THE SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS
* "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
* BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN NO
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL
* INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING
* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. NO ASSURANCES ARE
* PROVIDED BY THE COPYRIGHT HOLDERS THAT THE SOFTWARE DOES NOT INFRINGE
* THE PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OF ANY OTHER ENTITY.
* EACH COPYRIGHT HOLDER DISCLAIMS ANY LIABILITY TO THE USER FOR CLAIMS
* BROUGHT BY ANY OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL
* PROPERTY RIGHTS OR OTHERWISE. AS A CONDITION TO EXERCISING THE RIGHTS
* GRANTED HEREUNDER, EACH USER HEREBY ASSUMES SOLE RESPONSIBILITY TO SECURE
* ANY OTHER INTELLECTUAL PROPERTY RIGHTS NEEDED, IF ANY. THE SOFTWARE
* IS NOT FAULT-TOLERANT AND IS NOT INTENDED FOR USE IN MISSION-CRITICAL
* SYSTEMS, SUCH AS THOSE USED IN THE OPERATION OF NUCLEAR FACILITIES,
* AIRCRAFT NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL
* SYSTEMS, DIRECT LIFE SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH
* THE FAILURE OF THE SOFTWARE OR SYSTEM COULD LEAD DIRECTLY TO DEATH,
* PERSONAL INJURY, OR SEVERE PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH
* RISK ACTIVITIES"). THE COPYRIGHT HOLDERS SPECIFICALLY DISCLAIM ANY
* EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR HIGH RISK ACTIVITIES.
*
* __END_OF_JASPER_LICENSE__
*/
/*
* Bit Stream Class
*
* $Id: jpc_bs.h,v 1.1 2008/10/17 06:15:00 scuri Exp $
*/
#ifndef JPC_BS_H
#define JPC_BS_H
/******************************************************************************\
* Includes.
\******************************************************************************/
#include <stdio.h>
#include "jasper/jas_types.h"
#include "jasper/jas_stream.h"
/******************************************************************************\
* Constants.
\******************************************************************************/
/*
* Bit stream open mode flags.
*/
/* Bit stream open for reading. */
#define JPC_BITSTREAM_READ 0x01
/* Bit stream open for writing. */
#define JPC_BITSTREAM_WRITE 0x02
/*
* Bit stream flags.
*/
/* Do not close underlying character stream. */
#define JPC_BITSTREAM_NOCLOSE 0x01
/* End of file has been reached while reading. */
#define JPC_BITSTREAM_EOF 0x02
/* An I/O error has occured. */
#define JPC_BITSTREAM_ERR 0x04
/******************************************************************************\
* Types.
\******************************************************************************/
/* Bit stream class. */
typedef struct {
/* Some miscellaneous flags. */
int flags_;
/* The input/output buffer. */
uint_fast16_t buf_;
/* The number of bits remaining in the byte being read/written. */
int cnt_;
/* The underlying stream associated with this bit stream. */
jas_stream_t *stream_;
/* The mode in which this bit stream was opened. */
int openmode_;
} jpc_bitstream_t;
/******************************************************************************\
* Functions/macros for opening and closing bit streams..
\******************************************************************************/
/* Open a stream as a bit stream. */
jpc_bitstream_t *jpc_bitstream_sopen(jas_stream_t *stream, char *mode);
/* Close a bit stream. */
int jpc_bitstream_close(jpc_bitstream_t *bitstream);
/******************************************************************************\
* Functions/macros for reading from and writing to bit streams..
\******************************************************************************/
/* Read a bit from a bit stream. */
#if defined(DEBUG)
#define jpc_bitstream_getbit(bitstream) \
jpc_bitstream_getbit_func(bitstream)
#else
#define jpc_bitstream_getbit(bitstream) \
jpc_bitstream_getbit_macro(bitstream)
#endif
/* Write a bit to a bit stream. */
#if defined(DEBUG)
#define jpc_bitstream_putbit(bitstream, v) \
jpc_bitstream_putbit_func(bitstream, v)
#else
#define jpc_bitstream_putbit(bitstream, v) \
jpc_bitstream_putbit_macro(bitstream, v)
#endif
/* Read one or more bits from a bit stream. */
long jpc_bitstream_getbits(jpc_bitstream_t *bitstream, int n);
/* Write one or more bits to a bit stream. */
int jpc_bitstream_putbits(jpc_bitstream_t *bitstream, int n, long v);
/******************************************************************************\
* Functions/macros for flushing and aligning bit streams.
\******************************************************************************/
/* Align the current position within the bit stream to the next byte
boundary. */
int jpc_bitstream_align(jpc_bitstream_t *bitstream);
/* Align the current position in the bit stream with the next byte boundary,
ensuring that certain bits consumed in the process match a particular
pattern. */
int jpc_bitstream_inalign(jpc_bitstream_t *bitstream, int fillmask,
int filldata);
/* Align the current position in the bit stream with the next byte boundary,
writing bits from the specified pattern (if necessary) in the process. */
int jpc_bitstream_outalign(jpc_bitstream_t *bitstream, int filldata);
/* Check if a bit stream needs alignment. */
int jpc_bitstream_needalign(jpc_bitstream_t *bitstream);
/* How many additional bytes would be output if the bit stream was aligned? */
int jpc_bitstream_pending(jpc_bitstream_t *bitstream);
/******************************************************************************\
* Functions/macros for querying state information for bit streams.
\******************************************************************************/
/* Has EOF been encountered on a bit stream? */
#define jpc_bitstream_eof(bitstream) \
((bitstream)->flags_ & JPC_BITSTREAM_EOF)
/******************************************************************************\
* Internals.
\******************************************************************************/
/* DO NOT DIRECTLY INVOKE ANY OF THE MACROS OR FUNCTIONS BELOW. THEY ARE
FOR INTERNAL USE ONLY. */
int jpc_bitstream_getbit_func(jpc_bitstream_t *bitstream);
int jpc_bitstream_putbit_func(jpc_bitstream_t *bitstream, int v);
int jpc_bitstream_fillbuf(jpc_bitstream_t *bitstream);
#define jpc_bitstream_getbit_macro(bitstream) \
(assert((bitstream)->openmode_ & JPC_BITSTREAM_READ), \
(--(bitstream)->cnt_ >= 0) ? \
((int)(((bitstream)->buf_ >> (bitstream)->cnt_) & 1)) : \
jpc_bitstream_fillbuf(bitstream))
#define jpc_bitstream_putbit_macro(bitstream, bit) \
(assert((bitstream)->openmode_ & JPC_BITSTREAM_WRITE), \
(--(bitstream)->cnt_ < 0) ? \
((bitstream)->buf_ = ((bitstream)->buf_ << 8) & 0xffff, \
(bitstream)->cnt_ = ((bitstream)->buf_ == 0xff00) ? 6 : 7, \
(bitstream)->buf_ |= ((bit) & 1) << (bitstream)->cnt_, \
(jas_stream_putc((bitstream)->stream_, (bitstream)->buf_ >> 8) == EOF) \
? (EOF) : ((bit) & 1)) : \
((bitstream)->buf_ |= ((bit) & 1) << (bitstream)->cnt_, \
(bit) & 1))
#endif
|
