aboutsummaryrefslogtreecommitdiffstats
path: root/userspace/bytetest.c
blob: aa48b9b3edce9b1ba2da916e2fec0a1152db0462 (plain) (blame)
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
/*
 * Lazy test for the case when the output size is known
 *
 * Author: Lasse Collin <lasse.collin@tukaani.org>
 *
 * This file has been put into the public domain.
 * You can do whatever you want with this file.
 */

#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "xz.h"

static uint8_t in[1];
static uint8_t out[BUFSIZ];

int main(int argc, char **argv)
{
	struct xz_buf b;
	struct xz_dec *s;
	enum xz_ret ret;
	const char *msg;
	size_t uncomp_size;

	if (argc != 2) {
		fputs("Give uncompressed size as the argument", stderr);
		return 1;
	}

	uncomp_size = atoi(argv[1]);

	xz_crc32_init();

	/*
	 * Support up to 64 MiB dictionary. The actually needed memory
	 * is allocated once the headers have been parsed.
	 */
	s = xz_dec_init(XZ_DYNALLOC, 1 << 26);
	if (s == NULL) {
		msg = "Memory allocation failed\n";
		goto error;
	}

	b.in = in;
	b.in_pos = 0;
	b.in_size = 0;
	b.out = out;
	b.out_pos = 0;
	b.out_size = uncomp_size < BUFSIZ ? uncomp_size : BUFSIZ;

	while (true) {
		if (b.in_pos == b.in_size) {
			b.in_size = fread(in, 1, sizeof(in), stdin);
			b.in_pos = 0;
		}

		ret = xz_dec_run(s, &b);

		if (b.out_pos == sizeof(out)) {
			if (fwrite(out, 1, b.out_pos, stdout) != b.out_pos) {
				msg = "Write error\n";
				goto error;
			}

			uncomp_size -= b.out_pos;
			b.out_pos = 0;
			b.out_size = uncomp_size < BUFSIZ
					? uncomp_size : BUFSIZ;
		}

		if (ret == XZ_OK)
			continue;

#ifdef XZ_DEC_ANY_CHECK
		if (ret == XZ_UNSUPPORTED_CHECK) {
			fputs(argv[0], stderr);
			fputs(": ", stderr);
			fputs("Unsupported check; not verifying "
					"file integrity\n", stderr);
			continue;
		}
#endif

		if (uncomp_size != b.out_pos) {
			msg = "Uncompressed size doesn't match\n";
			goto error;
		}

		if (fwrite(out, 1, b.out_pos, stdout) != b.out_pos
				|| fclose(stdout)) {
			msg = "Write error\n";
			goto error;
		}

		switch (ret) {
		case XZ_STREAM_END:
			xz_dec_end(s);
			return 0;

		case XZ_MEM_ERROR:
			msg = "Memory allocation failed\n";
			goto error;

		case XZ_MEMLIMIT_ERROR:
			msg = "Memory usage limit reached\n";
			goto error;

		case XZ_FORMAT_ERROR:
			msg = "Not a .xz file\n";
			goto error;

		case XZ_OPTIONS_ERROR:
			msg = "Unsupported options in the .xz headers\n";
			goto error;

		case XZ_DATA_ERROR:
		case XZ_BUF_ERROR:
			msg = "File is corrupt\n";
			goto error;

		default:
			msg = "Bug!\n";
			goto error;
		}
	}

error:
	xz_dec_end(s);
	fputs(argv[0], stderr);
	fputs(": ", stderr);
	fputs(msg, stderr);
	return 1;
}