aboutsummaryrefslogtreecommitdiff
path: root/lib/sqfshelper/write_inode.c
blob: 1295fa908888bab4151bb63919d5af40cce23422 (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
/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
 * write_inode.c
 *
 * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
 */
#include "config.h"

#include "meta_writer.h"
#include "util.h"

#include <assert.h>
#include <endian.h>
#include <stdlib.h>
#include <string.h>

static size_t hard_link_count(tree_node_t *n)
{
	size_t count;

	if (S_ISDIR(n->mode)) {
		count = 2;

		for (n = n->data.dir->children; n != NULL; n = n->next)
			++count;

		return count;
	}

	return 1;
}

static int get_type(tree_node_t *node)
{
	switch (node->mode & S_IFMT) {
	case S_IFSOCK:
		if (node->xattr != NULL)
			return SQFS_INODE_EXT_SOCKET;
		return SQFS_INODE_SOCKET;
	case S_IFIFO:
		if (node->xattr != NULL)
			return SQFS_INODE_EXT_FIFO;
		return SQFS_INODE_FIFO;
	case S_IFLNK:
		if (node->xattr != NULL)
			return SQFS_INODE_EXT_SLINK;
		return SQFS_INODE_SLINK;
	case S_IFBLK:
		if (node->xattr != NULL)
			return SQFS_INODE_EXT_BDEV;
		return SQFS_INODE_BDEV;
	case S_IFCHR:
		if (node->xattr != NULL)
			return SQFS_INODE_EXT_CDEV;
		return SQFS_INODE_CDEV;
	case S_IFREG: {
		file_info_t *fi = node->data.file;

		if (node->xattr != NULL || fi->sparse > 0)
			return SQFS_INODE_EXT_FILE;

		if (fi->startblock > 0xFFFFFFFFUL || fi->size > 0xFFFFFFFFUL)
			return SQFS_INODE_EXT_FILE;

		if (hard_link_count(node) > 1)
			return SQFS_INODE_EXT_FILE;

		return SQFS_INODE_FILE;
	}
	case S_IFDIR: {
		dir_info_t *di = node->data.dir;

		if (node->xattr != NULL)
			return SQFS_INODE_EXT_DIR;

		if (di->start_block > 0xFFFFFFFFUL || di->size > 0xFFFF)
			return SQFS_INODE_EXT_DIR;

		return SQFS_INODE_DIR;
	}
	}
	assert(0);
}

static int write_file_blocks(fstree_t *fs, file_info_t *fi, meta_writer_t *im)
{
	uint64_t i, count = fi->size / fs->block_size;
	uint32_t bs;

	if ((fi->size % fs->block_size) != 0 &&
	    !(fi->flags & FILE_FLAG_HAS_FRAGMENT)) {
		++count;
	}

	for (i = 0; i < count; ++i) {
		bs = htole32(fi->blocks[i].size);

		if (meta_writer_append(im, &bs, sizeof(bs)))
			return -1;
	}
	return 0;
}

static int write_dir_index(dir_index_t *diridx, meta_writer_t *im)
{
	sqfs_dir_index_t idx;
	size_t i;

	for (i = 0; i < diridx->num_nodes; ++i) {
		idx.start_block = htole32(diridx->idx_nodes[i].block);
		idx.index = htole32(diridx->idx_nodes[i].index);
		idx.size = strlen(diridx->idx_nodes[i].node->name) - 1;
		idx.size = htole32(idx.size);

		if (meta_writer_append(im, &idx, sizeof(idx)))
			return -1;

		if (meta_writer_append(im, diridx->idx_nodes[i].node->name,
				       le32toh(idx.size) + 1)) {
			return -1;
		}
	}
	return 0;
}

int meta_writer_write_inode(fstree_t *fs, id_table_t *idtbl, meta_writer_t *im,
			    meta_writer_t *dm, tree_node_t *node)
{
	dir_index_t *diridx = NULL;
	uint16_t uid_idx, gid_idx;
	sqfs_inode_t base;
	uint32_t offset;
	uint64_t block;

	if (id_table_id_to_index(idtbl, node->uid, &uid_idx))
		return -1;

	if (id_table_id_to_index(idtbl, node->gid, &gid_idx))
		return -1;

	meta_writer_get_position(im, &block, &offset);
	node->inode_ref = (block << 16) | offset;

	if (S_ISDIR(node->mode)) {
		if (meta_writer_write_dir(dm, node->data.dir, &diridx))
			return -1;
	}

	base.type = htole16(get_type(node));
	base.mode = htole16(node->mode);
	base.uid_idx = htole16(uid_idx);
	base.gid_idx = htole16(gid_idx);
	base.mod_time = htole32(node->mod_time);
	base.inode_number = htole32(node->inode_num);

	if (meta_writer_append(im, &base, sizeof(base))) {
		free(diridx);
		return -1;
	}

	switch (le16toh(base.type)) {
	case SQFS_INODE_FIFO:
	case SQFS_INODE_SOCKET: {
		sqfs_inode_ipc_t ipc = {
			.nlink = htole32(hard_link_count(node)),
		};

		return meta_writer_append(im, &ipc, sizeof(ipc));
	}
	case SQFS_INODE_EXT_FIFO:
	case SQFS_INODE_EXT_SOCKET: {
		sqfs_inode_ipc_ext_t ipc = {
			.nlink = htole32(hard_link_count(node)),
			.xattr_idx = htole32(0xFFFFFFFF),
		};

		if (node->xattr != NULL)
			ipc.xattr_idx = htole32(node->xattr->index);

		return meta_writer_append(im, &ipc, sizeof(ipc));
	}
	case SQFS_INODE_SLINK: {
		sqfs_inode_slink_t slink = {
			.nlink = htole32(hard_link_count(node)),
			.target_size = htole32(strlen(node->data.slink_target)),
		};

		if (meta_writer_append(im, &slink, sizeof(slink)))
			return -1;
		if (meta_writer_append(im, node->data.slink_target,
				       le32toh(slink.target_size))) {
			return -1;
		}
		break;
	}
	case SQFS_INODE_EXT_SLINK: {
		sqfs_inode_slink_t slink = {
			.nlink = htole32(hard_link_count(node)),
			.target_size = htole32(strlen(node->data.slink_target)),
		};
		uint32_t xattr = htole32(0xFFFFFFFF);

		if (node->xattr != NULL)
			xattr = htole32(node->xattr->index);

		if (meta_writer_append(im, &slink, sizeof(slink)))
			return -1;
		if (meta_writer_append(im, node->data.slink_target,
				       le32toh(slink.target_size))) {
			return -1;
		}
		if (meta_writer_append(im, &xattr, sizeof(xattr)))
			return -1;
		break;
	}
	case SQFS_INODE_BDEV:
	case SQFS_INODE_CDEV: {
		sqfs_inode_dev_t dev = {
			.nlink = htole32(hard_link_count(node)),
			.devno = htole32(node->data.devno),
		};

		return meta_writer_append(im, &dev, sizeof(dev));
	}
	case SQFS_INODE_EXT_BDEV:
	case SQFS_INODE_EXT_CDEV: {
		sqfs_inode_dev_ext_t dev = {
			.nlink = htole32(hard_link_count(node)),
			.devno = htole32(node->data.devno),
			.xattr_idx = htole32(0xFFFFFFFF),
		};

		if (node->xattr != NULL)
			dev.xattr_idx = htole32(node->xattr->index);

		return meta_writer_append(im, &dev, sizeof(dev));
	}
	case SQFS_INODE_EXT_FILE: {
		file_info_t *fi = node->data.file;
		sqfs_inode_file_ext_t ext = {
			.blocks_start = htole64(fi->startblock),
			.file_size = htole64(fi->size),
			.sparse = htole64(fi->sparse),
			.nlink = htole32(hard_link_count(node)),
			.fragment_idx = htole32(0xFFFFFFFF),
			.fragment_offset = htole32(0xFFFFFFFF),
			.xattr_idx = htole32(0xFFFFFFFF),
		};

		if ((fi->size % fs->block_size) != 0) {
			ext.fragment_idx = htole32(fi->fragment);
			ext.fragment_offset = htole32(fi->fragment_offset);
		}

		if (node->xattr != NULL)
			ext.xattr_idx = htole32(node->xattr->index);

		if (meta_writer_append(im, &ext, sizeof(ext)))
			return -1;
		return write_file_blocks(fs, fi, im);
	}
	case SQFS_INODE_FILE: {
		file_info_t *fi = node->data.file;
		sqfs_inode_file_t reg = {
			.blocks_start = htole32(fi->startblock),
			.fragment_index = htole32(0xFFFFFFFF),
			.fragment_offset = htole32(0xFFFFFFFF),
			.file_size = htole32(fi->size),
		};

		if ((fi->size % fs->block_size) != 0) {
			reg.fragment_index = htole32(fi->fragment);
			reg.fragment_offset = htole32(fi->fragment_offset);
		}

		if (meta_writer_append(im, &reg, sizeof(reg)))
			return -1;
		return write_file_blocks(fs, fi, im);
	}
	case SQFS_INODE_DIR: {
		sqfs_inode_dir_t dir = {
			.start_block = htole32(node->data.dir->start_block),
			.nlink = htole32(hard_link_count(node)),
			.size = htole16(node->data.dir->size),
			.offset = htole16(node->data.dir->block_offset),
			.parent_inode = node->parent ?
				htole32(node->parent->inode_num) : htole32(1),
		};

		return meta_writer_append(im, &dir, sizeof(dir));
	}
	case SQFS_INODE_EXT_DIR: {
		sqfs_inode_dir_ext_t ext = {
			.nlink = htole32(hard_link_count(node)),
			.size = htole32(node->data.dir->size),
			.start_block = htole32(node->data.dir->start_block),
			.parent_inode = node->parent ?
				htole32(node->parent->inode_num) : htole32(1),
			.inodex_count = htole32(0),
			.offset = htole16(node->data.dir->block_offset),
			.xattr_idx = htole32(0xFFFFFFFF),
		};

		if (node->xattr != NULL)
			ext.xattr_idx = htole32(node->xattr->index);

		if (diridx != NULL)
			ext.inodex_count = htole32(diridx->num_nodes - 1);

		if (meta_writer_append(im, &ext, sizeof(ext))) {
			free(diridx);
			return -1;
		}

		if (diridx != NULL && write_dir_index(diridx, im) != 0) {
			free(diridx);
			return -1;
		}

		free(diridx);
		break;
	}
	default:
		assert(0);
	}
	return 0;
}