libuci-sys 1.0.5

FFI bindings to OpenWRT UCI
Documentation 
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

/*
 * libuci - Library for the Unified Configuration Interface
 * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 */

#include <string.h>
#include <stdint.h>

#include "uci.h"

void uci_parse_section(struct uci_section *s, const struct uci_parse_option *opts,
		       int n_opts, struct uci_option **tb)
{
	struct uci_element *e;

	memset(tb, 0, n_opts * sizeof(*tb));

	uci_foreach_element(&s->options, e) {
		struct uci_option *o = uci_to_option(e);
		int i;

		for (i = 0; i < n_opts; i++) {
			if (tb[i])
				continue;

			if (strcmp(opts[i].name, o->e.name) != 0)
				continue;

			if (opts[i].type != o->type)
				continue;

			/* match found */
			tb[i] = o;
			break;
		}
	}
}

//-----------------------------------------------------------------------------
// MurmurHashNeutral2, by Austin Appleby

// Same as MurmurHash2, but endian- and alignment-neutral.
static uint32_t hash_murmur2(uint32_t h, const void * key, int len)
{
	const unsigned char * data = key;
	const uint32_t m = 0x5bd1e995;
	const int r = 24;

	while(len >= 4)
	{
		unsigned int k;

		k  = data[0];
		k |= data[1] << 8;
		k |= data[2] << 16;
		k |= data[3] << 24;

		k *= m;
		k ^= k >> r;
		k *= m;

		h *= m;
		h ^= k;

		data += 4;
		len -= 4;
	}

	switch(len)
	{
	case 3: h ^= data[2] << 16;
		/* fall through */
	case 2: h ^= data[1] << 8;
		/* fall through */
	case 1: h ^= data[0];
	        h *= m;
	}

	h ^= h >> 13;
	h *= m;
	h ^= h >> 15;

	return h;
}

static uint32_t uci_hash_list(uint32_t h, const struct uci_list *list)
{
	const struct uci_element *e;

	uci_foreach_element(list, e) {
		h = hash_murmur2(h, e->name, strlen(e->name) + 1);
	}
	return h;
}

uint32_t uci_hash_options(struct uci_option **tb, int n_opts)
{
	uint32_t h = 0xdeadc0de;
	int i;

	for (i = 0; i < n_opts; i++) {
		const struct uci_option *o = tb[i];

		if (!tb[i])
			continue;

		h = hash_murmur2(h, o->e.name, strlen(o->e.name) + 1);
		h = hash_murmur2(h, &o->type, sizeof(o->type));

		switch (tb[i]->type) {
		case UCI_TYPE_STRING:
			h = hash_murmur2(h, o->v.string, strlen(o->v.string) + 1);
			break;
		case UCI_TYPE_LIST:
			h = uci_hash_list(h, &o->v.list);
			break;
		}
	}

	return h;
}