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
|
/*
* qrencode - QR Code encoder
*
* Binary sequence class.
* Copyright (C) 2006-2017 Kentaro Fukuchi <kentaro@fukuchi.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "bitstream.h"
#define DEFAULT_BUFSIZE (128)
BitStream *BitStream_new(void)
{
BitStream *bstream;
bstream = (BitStream *)malloc(sizeof(BitStream));
if(bstream == NULL) return NULL;
bstream->length = 0;
bstream->data = (unsigned char *)malloc(DEFAULT_BUFSIZE);
if(bstream->data == NULL) {
free(bstream);
return NULL;
}
bstream->datasize = DEFAULT_BUFSIZE;
return bstream;
}
#ifdef WITH_TESTS
BitStream *BitStream_newWithBits(size_t size, unsigned char *bits)
{
BitStream *bstream;
if(size == 0) return BitStream_new();
bstream = (BitStream *)malloc(sizeof(BitStream));
if(bstream == NULL) return NULL;
bstream->data = (unsigned char *)malloc(size);
if(bstream->data == NULL) {
free(bstream);
return NULL;
}
bstream->length = size;
bstream->datasize = size;
memcpy(bstream->data, bits, size);
return bstream;
}
#endif
static int BitStream_expand(BitStream *bstream)
{
unsigned char *data;
data = (unsigned char *)realloc(bstream->data, bstream->datasize * 2);
if(data == NULL) {
return -1;
}
bstream->data = data;
bstream->datasize *= 2;
return 0;
}
static void BitStream_writeNum(unsigned char *dest, size_t bits, unsigned int num)
{
unsigned int mask;
size_t i;
unsigned char *p;
p = dest;
mask = 1U << (bits - 1);
for(i = 0; i < bits; i++) {
if(num & mask) {
*p = 1;
} else {
*p = 0;
}
p++;
mask = mask >> 1;
}
}
static void BitStream_writeBytes(unsigned char *dest, size_t size, unsigned char *data)
{
unsigned char mask;
size_t i, j;
unsigned char *p;
p = dest;
for(i = 0; i < size; i++) {
mask = 0x80;
for(j = 0; j < 8; j++) {
if(data[i] & mask) {
*p = 1;
} else {
*p = 0;
}
p++;
mask = mask >> 1;
}
}
}
int BitStream_append(BitStream *bstream, BitStream *arg)
{
int ret;
if(arg == NULL) {
return -1;
}
if(arg->length == 0) {
return 0;
}
while(bstream->length + arg->length > bstream->datasize) {
ret = BitStream_expand(bstream);
if(ret < 0) return ret;
}
memcpy(bstream->data + bstream->length, arg->data, arg->length);
bstream->length += arg->length;
return 0;
}
int BitStream_appendNum(BitStream *bstream, size_t bits, unsigned int num)
{
int ret;
if(bits == 0) return 0;
while(bstream->datasize - bstream->length < bits) {
ret = BitStream_expand(bstream);
if(ret < 0) return ret;
}
BitStream_writeNum(bstream->data + bstream->length, bits, num);
bstream->length += bits;
return 0;
}
int BitStream_appendBytes(BitStream *bstream, size_t size, unsigned char *data)
{
int ret;
if(size == 0) return 0;
while(bstream->datasize - bstream->length < size * 8) {
ret = BitStream_expand(bstream);
if(ret < 0) return ret;
}
BitStream_writeBytes(bstream->data + bstream->length, size, data);
bstream->length += size * 8;
return 0;
}
unsigned char *BitStream_toByte(BitStream *bstream)
{
size_t i, j, size, bytes, oddbits;
unsigned char *data, v;
unsigned char *p;
size = BitStream_size(bstream);
if(size == 0) {
return NULL;
}
data = (unsigned char *)malloc((size + 7) / 8);
if(data == NULL) {
return NULL;
}
bytes = size / 8;
p = bstream->data;
for(i = 0; i < bytes; i++) {
v = 0;
for(j = 0; j < 8; j++) {
v = (unsigned char)(v << 1);
v |= *p;
p++;
}
data[i] = v;
}
oddbits = size & 7;
if(oddbits > 0) {
v = 0;
for(j = 0; j < oddbits; j++) {
v = (unsigned char)(v << 1);
v |= *p;
p++;
}
data[bytes] = (unsigned char)(v << (8 - oddbits));
}
return data;
}
void BitStream_free(BitStream *bstream)
{
if(bstream != NULL) {
free(bstream->data);
free(bstream);
}
}
|
