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
|
#include <qpdf/BitStream.hh>
#include <qpdf/BitWriter.hh>
#include <qpdf/Pl_Buffer.hh>
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
// See comments in bits.cc
#define BITS_TESTING 1
#define BITS_READ 1
#define BITS_WRITE 1
#include "../libqpdf/bits.icc"
static void
print_values(int byte_offset, unsigned int bit_offset,
unsigned int bits_available)
{
std::cout << "byte offset = " << byte_offset << ", "
<< "bit offset = " << bit_offset << ", "
<< "bits available = " << bits_available << std::endl;
}
static void
test_read_bits(unsigned char const* buf,
unsigned char const*& p, unsigned int& bit_offset,
unsigned int& bits_available, int bits_wanted)
{
unsigned long result =
read_bits(p, bit_offset, bits_available, bits_wanted);
std::cout << "bits read: " << bits_wanted << ", result = " << result
<< std::endl;
print_values(p - buf, bit_offset, bits_available);
}
static void
test_write_bits(unsigned char& ch, unsigned int& bit_offset, unsigned long val,
int bits, Pl_Buffer* bp)
{
write_bits(ch, bit_offset, val, bits, bp);
printf("ch = %02x, bit_offset = %d\n",
static_cast<unsigned int>(ch), bit_offset);
}
static void
print_buffer(Pl_Buffer* bp)
{
bp->finish();
Buffer* b = bp->getBuffer();
unsigned char const* p = b->getBuffer();
size_t l = b->getSize();
for (unsigned long i = 0; i < l; ++i)
{
printf("%02x%s", static_cast<unsigned int>(p[i]),
(i == l - 1) ? "\n" : " ");
}
printf("\n");
delete b;
}
static void
test()
{
// 11110101 00010101 01100101 01111001 00010010 10001001 01110101 01001011
// F5 15 65 79 12 89 75 4B
// Read tests
static unsigned char const buf[] = {
0xF5, 0x15, 0x65, 0x79, 0x12, 0x89, 0x75, 0x4B
};
unsigned char const* p = buf;
unsigned int bit_offset = 7;
unsigned int bits_available = 64;
// 11110:101 0:001010:1 01100101: 01111001
// 0:00:1:0010 10001001 01110101 01001:011
print_values(p - buf, bit_offset, bits_available);
test_read_bits(buf, p, bit_offset, bits_available, 5);
test_read_bits(buf, p, bit_offset, bits_available, 4);
test_read_bits(buf, p, bit_offset, bits_available, 6);
test_read_bits(buf, p, bit_offset, bits_available, 9);
test_read_bits(buf, p, bit_offset, bits_available, 9);
test_read_bits(buf, p, bit_offset, bits_available, 2);
test_read_bits(buf, p, bit_offset, bits_available, 1);
test_read_bits(buf, p, bit_offset, bits_available, 0);
test_read_bits(buf, p, bit_offset, bits_available, 25);
try
{
test_read_bits(buf, p, bit_offset, bits_available, 4);
}
catch (std::exception& e)
{
std::cout << "exception: " << e.what() << std::endl;
print_values(p - buf, bit_offset, bits_available);
}
test_read_bits(buf, p, bit_offset, bits_available, 3);
std::cout << std::endl;
// 11110101 00010101 01100101 01111001: 00010010 10001001 01110101 01001011
p = buf;
bit_offset = 7;
bits_available = 64;
print_values(p - buf, bit_offset, bits_available);
test_read_bits(buf, p, bit_offset, bits_available, 32);
test_read_bits(buf, p, bit_offset, bits_available, 32);
std::cout << std::endl;
BitStream b(buf, 8);
std::cout << b.getBits(32) << std::endl;
b.reset();
std::cout << b.getBits(32) << std::endl;
std::cout << b.getBits(32) << std::endl;
std::cout << std::endl;
b.reset();
std::cout << b.getBits(6) << std::endl;
b.skipToNextByte();
std::cout << b.getBits(8) << std::endl;
b.skipToNextByte();
std::cout << b.getBits(8) << std::endl;
std::cout << std::endl;
b.reset();
std::cout << b.getBitsSigned(3) << std::endl;
std::cout << b.getBitsSigned(6) << std::endl;
std::cout << b.getBitsSigned(5) << std::endl;
std::cout << b.getBitsSigned(1) << std::endl;
std::cout << b.getBitsSigned(17) << std::endl;
std::cout << std::endl;
// Write tests
// 11110:101 0:001010:1 01100101: 01111001
// 0:00:1:0010 10001001 01110101 01001:011
unsigned char ch = 0;
bit_offset = 7;
Pl_Buffer* bp = new Pl_Buffer("buffer");
test_write_bits(ch, bit_offset, 30UL, 5, bp);
test_write_bits(ch, bit_offset, 10UL, 4, bp);
test_write_bits(ch, bit_offset, 10UL, 6, bp);
test_write_bits(ch, bit_offset, 16059UL, 0, bp);
test_write_bits(ch, bit_offset, 357UL, 9, bp);
print_buffer(bp);
test_write_bits(ch, bit_offset, 242UL, 9, bp);
test_write_bits(ch, bit_offset, 0UL, 2, bp);
test_write_bits(ch, bit_offset, 1UL, 1, bp);
test_write_bits(ch, bit_offset, 5320361UL, 25, bp);
test_write_bits(ch, bit_offset, 3UL, 3, bp);
print_buffer(bp);
test_write_bits(ch, bit_offset, 4111820153UL, 32, bp);
test_write_bits(ch, bit_offset, 310998347UL, 32, bp);
print_buffer(bp);
BitWriter bw(bp);
bw.writeBits(30UL, 5);
bw.flush();
bw.flush();
bw.writeBits(0xABUL, 8);
bw.flush();
print_buffer(bp);
bw.writeBitsSigned(-1, 3); // 111
bw.writeBitsSigned(-12, 6); // 110100
bw.writeBitsSigned(4, 3); // 100
bw.writeBitsSigned(-4, 3); // 100
bw.writeBitsSigned(-1, 1); // 1
bw.flush();
print_buffer(bp);
delete bp;
}
int main()
{
try
{
test();
}
catch (std::exception& e)
{
std::cout << "unexpected exception: " << e.what() << std::endl;
exit(2);
}
std::cout << "done" << std::endl;
return 0;
}
|
