aboutsummaryrefslogtreecommitdiff
path: root/lib/common/comp_opt.c
blob: 66d562e3a2aa7d18cb02a67c896293ad7daafdfc (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
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
 * comp_opt.c
 *
 * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
 */
#include "common.h"

#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <ctype.h>

typedef struct {
	const char *name;
	sqfs_u16 flag;
} flag_t;

static const flag_t gzip_flags[] = {
	{ "default", SQFS_COMP_FLAG_GZIP_DEFAULT },
	{ "filtered", SQFS_COMP_FLAG_GZIP_FILTERED },
	{ "huffman", SQFS_COMP_FLAG_GZIP_HUFFMAN },
	{ "rle", SQFS_COMP_FLAG_GZIP_RLE },
	{ "fixed", SQFS_COMP_FLAG_GZIP_FIXED },
};

static const flag_t xz_flags[] = {
	{ "x86", SQFS_COMP_FLAG_XZ_X86 },
	{ "powerpc", SQFS_COMP_FLAG_XZ_POWERPC },
	{ "ia64", SQFS_COMP_FLAG_XZ_IA64 },
	{ "arm", SQFS_COMP_FLAG_XZ_ARM },
	{ "armthumb", SQFS_COMP_FLAG_XZ_ARMTHUMB },
	{ "sparc", SQFS_COMP_FLAG_XZ_SPARC },
};

static const flag_t lz4_flags[] = {
	{ "hc", SQFS_COMP_FLAG_LZ4_HC },
};

static const char *lzo_algs[] = {
	[SQFS_LZO1X_1] = "lzo1x_1",
	[SQFS_LZO1X_1_11] = "lzo1x_1_11",
	[SQFS_LZO1X_1_12] = "lzo1x_1_12",
	[SQFS_LZO1X_1_15] = "lzo1x_1_15",
	[SQFS_LZO1X_999] = "lzo1x_999",
};

static int set_flag(sqfs_compressor_config_t *cfg, const char *name,
		    const flag_t *flags, size_t num_flags)
{
	size_t i;

	for (i = 0; i < num_flags; ++i) {
		if (strcmp(flags[i].name, name) == 0) {
			cfg->flags |= flags[i].flag;
			return 0;
		}
	}

	return -1;
}

static int find_lzo_alg(sqfs_compressor_config_t *cfg, const char *name)
{
	size_t i;

	for (i = 0; i < sizeof(lzo_algs) / sizeof(lzo_algs[0]); ++i) {
		if (strcmp(lzo_algs[i], name) == 0) {
			cfg->opt.lzo.algorithm = i;
			return 0;
		}
	}

	return -1;
}

enum {
	OPT_WINDOW = 0,
	OPT_LEVEL,
	OPT_ALG,
	OPT_DICT,
};
static char *const token[] = {
	[OPT_WINDOW] = (char *)"window",
	[OPT_LEVEL] = (char *)"level",
	[OPT_ALG] = (char *)"algorithm",
	[OPT_DICT] = (char *)"dictsize",
	NULL
};

int compressor_cfg_init_options(sqfs_compressor_config_t *cfg,
				E_SQFS_COMPRESSOR id,
				size_t block_size, char *options)
{
	size_t num_flags = 0, min_level = 0, max_level = 0, level, dict_size;
	const flag_t *flags = NULL;
	char *subopts, *value;
	int i, opt;

	if (sqfs_compressor_config_init(cfg, id, block_size, 0))
		return -1;

	if (options == NULL)
		return 0;

	switch (cfg->id) {
	case SQFS_COMP_GZIP:
		min_level = SQFS_GZIP_MIN_LEVEL;
		max_level = SQFS_GZIP_MAX_LEVEL;
		flags = gzip_flags;
		num_flags = sizeof(gzip_flags) / sizeof(gzip_flags[0]);
		break;
	case SQFS_COMP_LZO:
		min_level = SQFS_LZO_MIN_LEVEL;
		max_level = SQFS_LZO_MAX_LEVEL;
		break;
	case SQFS_COMP_ZSTD:
		min_level = SQFS_ZSTD_MIN_LEVEL;
		max_level = SQFS_ZSTD_MAX_LEVEL;
		break;
	case SQFS_COMP_XZ:
		flags = xz_flags;
		num_flags = sizeof(xz_flags) / sizeof(xz_flags[0]);
		break;
	case SQFS_COMP_LZ4:
		flags = lz4_flags;
		num_flags = sizeof(lz4_flags) / sizeof(lz4_flags[0]);
		break;
	default:
		break;
	}

	subopts = options;

	while (*subopts != '\0') {
		opt = getsubopt(&subopts, token, &value);

		switch (opt) {
		case OPT_WINDOW:
			if (cfg->id != SQFS_COMP_GZIP)
				goto fail_opt;

			if (value == NULL)
				goto fail_value;

			for (i = 0; isdigit(value[i]); ++i)
				;

			if (i < 1 || i > 3 || value[i] != '\0')
				goto fail_window;

			cfg->opt.gzip.window_size = atoi(value);

			if (cfg->opt.gzip.window_size < SQFS_GZIP_MIN_WINDOW ||
			    cfg->opt.gzip.window_size > SQFS_GZIP_MAX_WINDOW)
				goto fail_window;
			break;
		case OPT_LEVEL:
			if (value == NULL)
				goto fail_value;

			for (i = 0; isdigit(value[i]) && i < 3; ++i)
				;

			if (i < 1 || i > 3 || value[i] != '\0')
				goto fail_level;

			level = atoi(value);

			if (level < min_level || level > max_level)
				goto fail_level;

			switch (cfg->id) {
			case SQFS_COMP_GZIP:
				cfg->opt.gzip.level = level;
				break;
			case SQFS_COMP_LZO:
				cfg->opt.lzo.level = level;
				break;
			case SQFS_COMP_ZSTD:
				cfg->opt.zstd.level = level;
				break;
			default:
				goto fail_opt;
			}
			break;
		case OPT_ALG:
			if (cfg->id != SQFS_COMP_LZO)
				goto fail_opt;

			if (value == NULL)
				goto fail_value;

			if (find_lzo_alg(cfg, value))
				goto fail_lzo_alg;
			break;
		case OPT_DICT:
			if (cfg->id != SQFS_COMP_XZ)
				goto fail_opt;

			if (value == NULL)
				goto fail_value;

			if (parse_size("Parsing XZ dictionary size",
				       &dict_size, value, cfg->block_size)) {
				return -1;
			}

			cfg->opt.xz.dict_size = dict_size;
			break;
		default:
			if (set_flag(cfg, value, flags, num_flags))
				goto fail_opt;
			break;
		}
	}

	return 0;
fail_lzo_alg:
	fprintf(stderr, "Unknown lzo variant '%s'.\n", value);
	return -1;
fail_window:
	fputs("Window size must be a number between 8 and 15.\n", stderr);
	return -1;
fail_level:
	fprintf(stderr,
		"Compression level must be a number between " PRI_SZ " and "
		PRI_SZ ".\n", min_level, max_level);
	return -1;
fail_opt:
	fprintf(stderr, "Unknown compressor option '%s'.\n", value);
	return -1;
fail_value:
	fprintf(stderr, "Missing value for compressor option '%s'.\n",
		token[opt]);
	return -1;
}

typedef void (*compressor_help_fun_t)(void);

static void gzip_print_help(void)
{
	size_t i;

	printf(
"Available options for gzip compressor:\n"
"\n"
"    level=<value>    Compression level. Value from 1 to 9.\n"
"                     Defaults to %d.\n"
"    window=<size>    Deflate compression window size. Value from 8 to 15.\n"
"                     Defaults to %d.\n"
"\n"
"In additon to the options, one or more strategies can be specified.\n"
"If multiple stratgies are provided, the one yielding the best compression\n"
"ratio will be used.\n"
"\n"
"The following strategies are available:\n",
	SQFS_GZIP_DEFAULT_LEVEL, SQFS_GZIP_DEFAULT_WINDOW);

	for (i = 0; i < sizeof(gzip_flags) / sizeof(gzip_flags[0]); ++i)
		printf("\t%s\n", gzip_flags[i].name);
}

static void lz4_print_help(void)
{
	fputs("Available options for lz4 compressor:\n"
	      "\n"
	      "    hc    If present, use slower but better compressing\n"
	      "          variant of lz4.\n"
	      "\n",
	      stdout);
}

static void lzo_print_help(void)
{
	size_t i;

	fputs("Available options for lzo compressor:\n"
	      "\n"
	      "    algorithm=<name>  Specify the variant of lzo to use.\n"
	      "                      Defaults to 'lzo1x_999'.\n"
	      "    level=<value>     For lzo1x_999, the compression level.\n"
	      "                      Value from 1 to 9. Defaults to 8.\n"
	      "                      Ignored if algorithm is not lzo1x_999.\n"
	      "\n"
	      "Available algorithms:\n",
	      stdout);

	for (i = 0; i < sizeof(lzo_algs) / sizeof(lzo_algs[0]); ++i)
		printf("\t%s\n", lzo_algs[i]);
}

static void xz_print_help(void)
{
	size_t i;

	fputs(
"Available options for xz compressor:\n"
"\n"
"    dictsize=<value>  Dictionary size. Either a value in bytes or a\n"
"                      percentage of the block size. Defaults to 100%.\n"
"                      The suffix '%' indicates a percentage. 'K' and 'M'\n"
"                      can also be used for kibi and mebi bytes\n"
"                      respecitively.\n"
"\n"
"In additon to the options, one or more bcj filters can be specified.\n"
"If multiple filters are provided, the one yielding the best compression\n"
"ratio will be used.\n"
"\n"
"The following filters are available:\n",
	stdout);

	for (i = 0; i < sizeof(xz_flags) / sizeof(xz_flags[0]); ++i)
		printf("\t%s\n", xz_flags[i].name);
}

static void zstd_print_help(void)
{
	printf("Available options for zstd compressor:\n"
	       "\n"
	       "    level=<value>    Set compression level. Defaults to %d.\n"
	       "                     Maximum is %d.\n"
	       "\n",
	       SQFS_ZSTD_DEFAULT_LEVEL, SQFS_ZSTD_MAX_LEVEL);
}

static const compressor_help_fun_t helpfuns[SQFS_COMP_MAX + 1] = {
	[SQFS_COMP_GZIP] = gzip_print_help,
	[SQFS_COMP_XZ] = xz_print_help,
	[SQFS_COMP_LZO] = lzo_print_help,
	[SQFS_COMP_LZ4] = lz4_print_help,
	[SQFS_COMP_ZSTD] = zstd_print_help,
};

void compressor_print_help(E_SQFS_COMPRESSOR id)
{
	if (id < SQFS_COMP_MIN || id > SQFS_COMP_MAX)
		return;

	if (helpfuns[id] == NULL)
		return;

	helpfuns[id]();
}