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Diffstat (limited to '')
-rw-r--r-- | libraries/openjpeg-libsl/libopenjpeg/bio.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/libraries/openjpeg-libsl/libopenjpeg/bio.c b/libraries/openjpeg-libsl/libopenjpeg/bio.c new file mode 100644 index 0000000..2a305a7 --- /dev/null +++ b/libraries/openjpeg-libsl/libopenjpeg/bio.c | |||
@@ -0,0 +1,187 @@ | |||
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) 2001-2003, David Janssens | ||
5 | * Copyright (c) 2002-2003, Yannick Verschueren | ||
6 | * Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe | ||
7 | * Copyright (c) 2005, Herve Drolon, FreeImage Team | ||
8 | * All rights reserved. | ||
9 | * | ||
10 | * Redistribution and use in source and binary forms, with or without | ||
11 | * modification, are permitted provided that the following conditions | ||
12 | * are met: | ||
13 | * 1. Redistributions of source code must retain the above copyright | ||
14 | * notice, this list of conditions and the following disclaimer. | ||
15 | * 2. Redistributions in binary form must reproduce the above copyright | ||
16 | * notice, this list of conditions and the following disclaimer in the | ||
17 | * documentation and/or other materials provided with the distribution. | ||
18 | * | ||
19 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS' | ||
20 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | ||
21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | ||
22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | ||
23 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | ||
24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | ||
25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | ||
26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | ||
27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | ||
28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | ||
29 | * POSSIBILITY OF SUCH DAMAGE. | ||
30 | */ | ||
31 | |||
32 | #include "opj_includes.h" | ||
33 | |||
34 | /** @defgroup BIO BIO - Individual bit input-output stream */ | ||
35 | /*@{*/ | ||
36 | |||
37 | /** @name Local static functions */ | ||
38 | /*@{*/ | ||
39 | |||
40 | /** | ||
41 | Write a bit | ||
42 | @param bio BIO handle | ||
43 | @param b Bit to write (0 or 1) | ||
44 | */ | ||
45 | static void bio_putbit(opj_bio_t *bio, int b); | ||
46 | /** | ||
47 | Read a bit | ||
48 | @param bio BIO handle | ||
49 | @return Returns the read bit | ||
50 | */ | ||
51 | static int bio_getbit(opj_bio_t *bio); | ||
52 | /** | ||
53 | Write a byte | ||
54 | @param bio BIO handle | ||
55 | @return Returns 0 if successful, returns 1 otherwise | ||
56 | */ | ||
57 | static int bio_byteout(opj_bio_t *bio); | ||
58 | /** | ||
59 | Read a byte | ||
60 | @param bio BIO handle | ||
61 | @return Returns 0 if successful, returns 1 otherwise | ||
62 | */ | ||
63 | static int bio_bytein(opj_bio_t *bio); | ||
64 | |||
65 | /*@}*/ | ||
66 | |||
67 | /*@}*/ | ||
68 | |||
69 | /* | ||
70 | ========================================================== | ||
71 | local functions | ||
72 | ========================================================== | ||
73 | */ | ||
74 | |||
75 | static int bio_byteout(opj_bio_t *bio) { | ||
76 | bio->buf = (bio->buf << 8) & 0xffff; | ||
77 | bio->ct = bio->buf == 0xff00 ? 7 : 8; | ||
78 | if (bio->bp >= bio->end) { | ||
79 | return 1; | ||
80 | } | ||
81 | *bio->bp++ = bio->buf >> 8; | ||
82 | return 0; | ||
83 | } | ||
84 | |||
85 | static int bio_bytein(opj_bio_t *bio) { | ||
86 | bio->buf = (bio->buf << 8) & 0xffff; | ||
87 | bio->ct = bio->buf == 0xff00 ? 7 : 8; | ||
88 | if (bio->bp >= bio->end) { | ||
89 | return 1; | ||
90 | } | ||
91 | bio->buf |= *bio->bp++; | ||
92 | return 0; | ||
93 | } | ||
94 | |||
95 | static void bio_putbit(opj_bio_t *bio, int b) { | ||
96 | if (bio->ct == 0) { | ||
97 | bio_byteout(bio); | ||
98 | } | ||
99 | bio->ct--; | ||
100 | bio->buf |= b << bio->ct; | ||
101 | } | ||
102 | |||
103 | static int bio_getbit(opj_bio_t *bio) { | ||
104 | if (bio->ct == 0) { | ||
105 | bio_bytein(bio); | ||
106 | } | ||
107 | bio->ct--; | ||
108 | return (bio->buf >> bio->ct) & 1; | ||
109 | } | ||
110 | |||
111 | /* | ||
112 | ========================================================== | ||
113 | Bit Input/Output interface | ||
114 | ========================================================== | ||
115 | */ | ||
116 | |||
117 | opj_bio_t* bio_create() { | ||
118 | opj_bio_t *bio = (opj_bio_t*)opj_malloc(sizeof(opj_bio_t)); | ||
119 | return bio; | ||
120 | } | ||
121 | |||
122 | void bio_destroy(opj_bio_t *bio) { | ||
123 | if(bio) { | ||
124 | opj_free(bio); | ||
125 | } | ||
126 | } | ||
127 | |||
128 | int bio_numbytes(opj_bio_t *bio) { | ||
129 | return (bio->bp - bio->start); | ||
130 | } | ||
131 | |||
132 | void bio_init_enc(opj_bio_t *bio, unsigned char *bp, int len) { | ||
133 | bio->start = bp; | ||
134 | bio->end = bp + len; | ||
135 | bio->bp = bp; | ||
136 | bio->buf = 0; | ||
137 | bio->ct = 8; | ||
138 | } | ||
139 | |||
140 | void bio_init_dec(opj_bio_t *bio, unsigned char *bp, int len) { | ||
141 | bio->start = bp; | ||
142 | bio->end = bp + len; | ||
143 | bio->bp = bp; | ||
144 | bio->buf = 0; | ||
145 | bio->ct = 0; | ||
146 | } | ||
147 | |||
148 | void bio_write(opj_bio_t *bio, int v, int n) { | ||
149 | int i; | ||
150 | for (i = n - 1; i >= 0; i--) { | ||
151 | bio_putbit(bio, (v >> i) & 1); | ||
152 | } | ||
153 | } | ||
154 | |||
155 | int bio_read(opj_bio_t *bio, int n) { | ||
156 | int i, v; | ||
157 | v = 0; | ||
158 | for (i = n - 1; i >= 0; i--) { | ||
159 | v += bio_getbit(bio) << i; | ||
160 | } | ||
161 | return v; | ||
162 | } | ||
163 | |||
164 | int bio_flush(opj_bio_t *bio) { | ||
165 | bio->ct = 0; | ||
166 | if (bio_byteout(bio)) { | ||
167 | return 1; | ||
168 | } | ||
169 | if (bio->ct == 7) { | ||
170 | bio->ct = 0; | ||
171 | if (bio_byteout(bio)) { | ||
172 | return 1; | ||
173 | } | ||
174 | } | ||
175 | return 0; | ||
176 | } | ||
177 | |||
178 | int bio_inalign(opj_bio_t *bio) { | ||
179 | bio->ct = 0; | ||
180 | if ((bio->buf & 0xff) == 0xff) { | ||
181 | if (bio_bytein(bio)) { | ||
182 | return 1; | ||
183 | } | ||
184 | bio->ct = 0; | ||
185 | } | ||
186 | return 0; | ||
187 | } | ||