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
|
#include <qpdf/assert_test.h>
#include <qpdf/Pl_Base64.hh>
#include <qpdf/Pl_OStream.hh>
#include <qpdf/QUtil.hh>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <stdexcept>
static bool
write_some(FILE* f, size_t bytes, Pipeline* p)
{
unsigned char buf[1000];
assert(bytes <= sizeof(buf));
size_t len = fread(buf, 1, bytes, f);
if (len > 0) {
p->write(buf, len);
}
if (len < bytes) {
if (ferror(f)) {
std::cerr << "error reading file" << std::endl;
exit(2);
}
p->finish();
return false;
}
return (len == bytes);
}
static void
usage()
{
std::cerr << "Usage: base64 encode|decode" << std::endl;
exit(2);
}
int
main(int argc, char* argv[])
{
if (argc != 2) {
usage();
}
QUtil::binary_stdout();
QUtil::binary_stdin();
Pl_Base64::action_e action = Pl_Base64::a_decode;
if (strcmp(argv[1], "encode") == 0) {
action = Pl_Base64::a_encode;
} else if (strcmp(argv[1], "decode") != 0) {
usage();
}
try {
Pl_OStream out("stdout", std::cout);
Pl_Base64 decode("decode", &out, action);
// The comments are "n: n%4 n%3", where n is the number of
// bytes read at the end of the call, and are there to
// indicate that we are reading in chunks that exercise
// various boundary conditions around subsequent writes and
// the state of buf and pos. There are some writes that don't
// do flush at all, some that call flush multiple times, and
// some that start in the middle and do flush, and this is
// true for both encode and decode.
if (write_some(stdin, 1, &decode) && // 1: 1 1
write_some(stdin, 4, &decode) && // 5: 1 2
write_some(stdin, 2, &decode) && // 7: 3 1
write_some(stdin, 2, &decode) && // 9: 1 0
write_some(stdin, 7, &decode) && // 16: 0 1
write_some(stdin, 1, &decode) && // 17: 1 2
write_some(stdin, 9, &decode) && // 26: 2 2
write_some(stdin, 2, &decode)) { // 28: 0 1
while (write_some(stdin, 1000, &decode)) {
}
}
} catch (std::exception& e) {
std::cout << "exception: " << e.what() << std::endl;
exit(2);
}
return 0;
}
|
