summaryrefslogtreecommitdiffstats
path: root/usr.bin/mkuzip/mkuzip.c
blob: 02ebefa8094f6489d27fc77237e268a8bd1125ec (plain)
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
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
/*
 * ----------------------------------------------------------------------------
 * "THE BEER-WARE LICENSE" (Revision 42):
 * <sobomax@FreeBSD.ORG> wrote this file. As long as you retain this notice you
 * can do whatever you want with this stuff. If we meet some day, and you think
 * this stuff is worth it, you can buy me a beer in return.       Maxim Sobolev
 * ----------------------------------------------------------------------------
 *
 * $FreeBSD$
 *
 */

#include <sys/types.h>
#include <sys/disk.h>
#include <sys/endian.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/uio.h>
#include <netinet/in.h>
#include <zlib.h>
#include <err.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#define CLSTSIZE	16384
#define DEFAULT_SUFX	".uzip"

#define CLOOP_MAGIC_LEN 128
static char CLOOP_MAGIC_START[] = "#!/bin/sh\n#V2.0 Format\n"
    "m=geom_uzip\n(kldstat -m $m 2>&-||kldload $m)>&-&&"
    "mount_cd9660 /dev/`mdconfig -af $0`.uzip $1\nexit $?\n";

static char *readblock(int, char *, u_int32_t);
static void usage(void);
static void *safe_malloc(size_t);
static void cleanup(void);

static char *cleanfile = NULL;

int main(int argc, char **argv)
{
	char *iname, *oname, *obuf, *ibuf;
	uint64_t *toc;
	int fdr, fdw, i, opt, verbose, tmp;
	struct iovec iov[2];
	struct stat sb;
	uLongf destlen;
	uint64_t offset;
	struct cloop_header {
		char magic[CLOOP_MAGIC_LEN];    /* cloop magic */
		uint32_t blksz;                 /* block size */
		uint32_t nblocks;               /* number of blocks */
	} hdr;

	memset(&hdr, 0, sizeof(hdr));
	hdr.blksz = CLSTSIZE;
	strcpy(hdr.magic, CLOOP_MAGIC_START);
	oname = NULL;
	verbose = 0;

	while((opt = getopt(argc, argv, "o:s:v")) != -1) {
		switch(opt) {
		case 'o':
			oname = optarg;
			break;

		case 's':
			tmp = atoi(optarg);
			if (tmp <= 0) {
				errx(1, "invalid cluster size specified: %s",
				    optarg);
				/* Not reached */
			}
			if (tmp % DEV_BSIZE != 0) {
				errx(1, "cluster size should be multiple of %d",
				    DEV_BSIZE);
				/* Not reached */
			}
			if (compressBound(tmp) > MAXPHYS) {
				errx(1, "cluster size is too large");
				    /* Not reached */
			}
			hdr.blksz = tmp;
			break;

		case 'v':
			verbose = 1;
			break;

		default:
			usage();
			/* Not reached */
		}
	}
	argc -= optind;
	argv += optind;

	if (argc != 1) {
		usage();
		/* Not reached */
	}

	iname = argv[0];
	if (oname == NULL) {
		asprintf(&oname, "%s%s", iname, DEFAULT_SUFX);
		if (oname == NULL) {
			err(1, "can't allocate memory");
			/* Not reached */
		}
	}

	obuf = safe_malloc(compressBound(hdr.blksz));
	ibuf = safe_malloc(hdr.blksz);

	signal(SIGHUP, exit);
	signal(SIGINT, exit);
	signal(SIGTERM, exit);
	signal(SIGXCPU, exit);
	signal(SIGXFSZ, exit);
	atexit(cleanup);

	fdr = open(iname, O_RDONLY);
	if (fdr < 0) {
		err(1, "open(%s)", iname);
		/* Not reached */
	}
	if (fstat(fdr, &sb) != 0) {
		err(1, "fstat(%s)", iname);
		/* Not reached */
	}
	if (S_ISCHR(sb.st_mode)) {
		off_t ms;

		if (ioctl(fdr, DIOCGMEDIASIZE, &ms) < 0) {
			err(1, "ioctl(DIOCGMEDIASIZE)");
			/* Not reached */
		}
		sb.st_size = ms;
	} else if (!S_ISREG(sb.st_mode)) {
		fprintf(stderr, "%s: not a character device or regular file\n",
			iname);
		exit(1);
	}
	hdr.nblocks = sb.st_size / hdr.blksz;
	if ((sb.st_size % hdr.blksz) != 0) {
		if (verbose != 0)
			fprintf(stderr, "file size is not multiple "
			"of %d, padding data\n", hdr.blksz);
		hdr.nblocks++;
	}
	toc = safe_malloc((hdr.nblocks + 1) * sizeof(*toc));

	fdw = open(oname, O_WRONLY | O_TRUNC | O_CREAT,
		   S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH);
	if (fdw < 0) {
		err(1, "open(%s)", oname);
		/* Not reached */
	}
	cleanfile = oname;

	/* Prepare header that we will write later when we have index ready. */
	iov[0].iov_base = (char *)&hdr;
	iov[0].iov_len = sizeof(hdr);
	iov[1].iov_base = (char *)toc;
	iov[1].iov_len = (hdr.nblocks + 1) * sizeof(*toc);
	offset = iov[0].iov_len + iov[1].iov_len;

	/* Reserve space for header */
	lseek(fdw, offset, SEEK_SET);

	if (verbose != 0)
		fprintf(stderr, "data size %ju bytes, number of clusters "
		    "%u, index length %zu bytes\n", sb.st_size,
		    hdr.nblocks, iov[1].iov_len);

	for(i = 0; i == 0 || ibuf != NULL; i++) {
		ibuf = readblock(fdr, ibuf, hdr.blksz);
		if (ibuf != NULL) {
			destlen = compressBound(hdr.blksz);
			if (compress2(obuf, &destlen, ibuf, hdr.blksz,
			    Z_BEST_COMPRESSION) != Z_OK) {
				errx(1, "can't compress data: compress2() "
				    "failed");
				/* Not reached */
			}
			if (verbose != 0)
				fprintf(stderr, "cluster #%d, in %u bytes, "
				    "out %lu bytes\n", i, hdr.blksz, destlen);
		} else {
			destlen = DEV_BSIZE - (offset % DEV_BSIZE);
			memset(obuf, 0, destlen);
			if (verbose != 0)
				fprintf(stderr, "padding data with %lu bytes so "
				    "that file size is multiple of %d\n", destlen,
				    DEV_BSIZE);
		}
		if (write(fdw, obuf, destlen) < 0) {
			err(1, "write(%s)", oname);
			/* Not reached */
		}
		toc[i] = htobe64(offset);
		offset += destlen;
	}
	close(fdr);

	if (verbose != 0)
		fprintf(stderr, "compressed data to %ju bytes, saved %lld "
		    "bytes, %.2f%% decrease.\n", offset, (long long)(sb.st_size - offset),
		    100.0 * (long long)(sb.st_size - offset) / (float)sb.st_size);

	/* Convert to big endian */
	hdr.blksz = htonl(hdr.blksz);
	hdr.nblocks = htonl(hdr.nblocks);
	/* Write headers into pre-allocated space */
	lseek(fdw, 0, SEEK_SET);
	if (writev(fdw, iov, 2) < 0) {
		err(1, "writev(%s)", oname);
		/* Not reached */
	}
	cleanfile = NULL;
	close(fdw);

	exit(0);
}

static char *
readblock(int fd, char *ibuf, u_int32_t clstsize)
{
	int numread;

	bzero(ibuf, clstsize);
	numread = read(fd, ibuf, clstsize);
	if (numread < 0) {
		err(1, "read() failed");
		/* Not reached */
	}
	if (numread == 0) {
		return NULL;
	}
	return ibuf;
}

static void
usage(void)
{

	fprintf(stderr, "usage: mkuzip [-v] [-o outfile] [-s cluster_size] infile\n");
	exit(1);
}

static void *
safe_malloc(size_t size)
{
	void *retval;

	retval = malloc(size);
	if (retval == NULL) {
		err(1, "can't allocate memory");
		/* Not reached */
	}
	return retval;
}

static void
cleanup(void)
{

	if (cleanfile != NULL)
		unlink(cleanfile);
}
OpenPOWER on IntegriCloud