summaryrefslogtreecommitdiff
path: root/utils/http/parameter.c
blob: 968879d806c1d3460c78ffe5de635ff9472bb6b2 (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
/*
 * Copyright 2010 John-Mark Bell <jmb@netsurf-browser.org>
 *
 * This file is part of NetSurf, http://www.netsurf-browser.org/
 *
 * NetSurf is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * NetSurf 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

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

#include "utils/http.h"

#include "utils/http/generics.h"
#include "utils/http/parameter_internal.h"
#include "utils/http/primitives.h"

/**
 * Representation of an HTTP parameter
 */
struct http_parameter {
	http__item base;

	lwc_string *name;		/**< Parameter name */
	lwc_string *value;		/**< Parameter value */
};

/**
 * Destructor for an HTTP parameter
 *
 * \param self  Parameter to destroy
 */
static void http_destroy_parameter(http_parameter *self)
{
	lwc_string_unref(self->name);
	lwc_string_unref(self->value);
	free(self);
}

/**
 * Parse an HTTP parameter
 *
 * \param input      Pointer to current input byte. Updated on exit.
 * \param parameter  Pointer to location to receive on-heap parameter.
 * \return NSERROR_OK on success,
 * 	   NSERROR_NOMEM on memory exhaustion,
 * 	   NSERROR_NOT_FOUND if no parameter could be parsed
 *
 * The returned parameter is owned by the caller.
 */
nserror http__parse_parameter(const char **input, http_parameter **parameter)
{
	const char *pos = *input;
	lwc_string *name;
	lwc_string *value;
	http_parameter *param;
	nserror error;

	/* token "=" ( token | quoted-string ) */

	error = http__parse_token(&pos, &name);
	if (error != NSERROR_OK)
		return error;

	http__skip_LWS(&pos);

	if (*pos != '=') {
		lwc_string_unref(name);
		return NSERROR_NOT_FOUND;
	}

	pos++;

	http__skip_LWS(&pos);

	if (*pos == '"')
		error = http__parse_quoted_string(&pos, &value);
	else
		error = http__parse_token(&pos, &value);

	if (error != NSERROR_OK) {
		lwc_string_unref(name);
		return error;
	}

	param = malloc(sizeof(*param));
	if (param == NULL) {
		lwc_string_unref(value);
		lwc_string_unref(name);
		return NSERROR_NOMEM;
	}

	HTTP__ITEM_INIT(param, NULL, http_destroy_parameter);
	param->name = name;
	param->value = value;

	*parameter = param;
	*input = pos;

	return NSERROR_OK;
}

/* See parameter.h for documentation */
nserror http_parameter_list_find_item(const http_parameter *list,
		lwc_string *name, lwc_string **value)
{
	bool match;

	while (list != NULL) {
		if (lwc_string_caseless_isequal(name, list->name, 
				&match) == lwc_error_ok && match)
			break;

		list = (http_parameter *) list->base.next;
	}

	if (list == NULL)
		return NSERROR_NOT_FOUND;

	*value = lwc_string_ref(list->value);

	return NSERROR_OK;
}

/* See parameter.h for documentation */
const http_parameter *http_parameter_list_iterate(const http_parameter *cur,
		lwc_string **name, lwc_string **value)
{
	if (cur == NULL)
		return NULL;

	*name = lwc_string_ref(cur->name);
	*value = lwc_string_ref(cur->value);

	return (http_parameter *) cur->base.next;
}

/* See parameter.h for documentation */
void http_parameter_list_destroy(http_parameter *list)
{
	http__item_list_destroy(list);
}