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1/*
2 * plist.c
3 * Builds plist XML structures.
4 *
5 * Copyright (c) 2008 Zach C. All Rights Reserved.
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#include <libxml/parser.h>
23#include <libxml/tree.h>
24#include <string.h>
25#include <assert.h>
26#include "plist.h"
27
28const char *plist_base = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n\
29<!DOCTYPE plist PUBLIC \"-//Apple Computer//DTD PLIST 1.0//EN\" \"http://www.apple.com/DTDs/PropertyList-1.0.dtd\">\n\
30<plist version=\"1.0\">\n\
31</plist>\0";
32
33/** Formats a block of text to be a given indentation and width.
34 *
35 * The total width of the return string will be depth + cols.
36 *
37 * @param buf The string to format.
38 * @param cols The number of text columns for returned block of text.
39 * @param depth The number of tabs to indent the returned block of text.
40 *
41 * @return The formatted string.
42 */
43static char *format_string(const char *buf, int cols, int depth)
44{
45 int colw = depth + cols + 1;
46 int len = strlen(buf);
47 int nlines = len / cols + 1;
48 char *new_buf = (char *) malloc(nlines * colw + depth + 1);
49 int i = 0;
50 int j = 0;
51
52 assert(cols >= 0);
53 assert(depth >= 0);
54
55 // Inserts new lines and tabs at appropriate locations
56 for (i = 0; i < nlines; i++) {
57 new_buf[i * colw] = '\n';
58 for (j = 0; j < depth; j++)
59 new_buf[i * colw + 1 + j] = '\t';
60 memcpy(new_buf + i * colw + 1 + depth, buf + i * cols, cols);
61 }
62 new_buf[len + (1 + depth) * nlines] = '\n';
63
64 // Inserts final row of indentation and termination character
65 for (j = 0; j < depth; j++)
66 new_buf[len + (1 + depth) * nlines + 1 + j] = '\t';
67 new_buf[len + (1 + depth) * nlines + depth + 1] = '\0';
68
69 return new_buf;
70}
71
72/** Creates a new plist XML document.
73 *
74 * @return The plist XML document.
75 */
76xmlDocPtr new_plist(void)
77{
78 char *plist = strdup(plist_base);
79 xmlDocPtr plist_xml = xmlReadMemory(plist, strlen(plist), NULL, NULL, 0);
80
81 if (!plist_xml)
82 return NULL;
83
84 free(plist);
85
86 return plist_xml;
87}
88
89/** Destroys a previously created XML document.
90 *
91 * @param plist The XML document to destroy.
92 */
93void free_plist(xmlDocPtr plist)
94{
95 if (!plist)
96 return;
97
98 xmlFreeDoc(plist);
99}
100
101/** Adds a new node as a child to a given node.
102 *
103 * This is a lower level function so you probably want to use
104 * add_key_str_dict_element, add_key_dict_node or add_key_data_dict_element
105 * instead.
106 *
107 * @param plist The plist XML document to which the to_node belongs.
108 * @param name The name of the new node.
109 * @param content The string containing the text node of the new node.
110 * @param to_node The node to attach the child node to. If none is given, the
111 * root node of the given document is used.
112 * @param depth The number of tabs to indent the new node.
113 *
114 * @return The newly created node.
115 */
116xmlNode *add_child_to_plist(xmlDocPtr plist, const char *name, const char *content, xmlNode * to_node, int depth)
117{
118 int i = 0;
119 xmlNode *child;
120
121 if (!plist)
122 return NULL;
123 assert(depth >= 0);
124 if (!to_node)
125 to_node = xmlDocGetRootElement(plist);
126
127 for (i = 0; i < depth; i++) {
128 xmlNodeAddContent(to_node, "\t");
129 }
130 child = xmlNewChild(to_node, NULL, name, content);
131 xmlNodeAddContent(to_node, "\n");
132
133 return child;
134}
135
136/** Adds a string key-pair to a plist XML document.
137 *
138 * @param plist The plist XML document to add the new node to.
139 * @param dict The dictionary node within the plist XML document to add the new node to.
140 * @param key The string containing the key value.
141 * @param value The string containing the value.
142 * @param depth The number of tabs to indent the new node.
143 *
144 * @return The newly created key node.
145 */
146xmlNode *add_key_str_dict_element(xmlDocPtr plist, xmlNode * dict, const char *key, const char *value, int depth)
147{
148 xmlNode *keyPtr;
149
150 keyPtr = add_child_to_plist(plist, "key", key, dict, depth);
151 add_child_to_plist(plist, "string", value, dict, depth);
152
153 return keyPtr;
154}
155
156/** Adds a new dictionary key-pair to a plist XML document.
157 *
158 * @param plist The plist XML document to add the new node to.
159 * @param dict The dictionary node within the plist XML document to add the new node to.
160 * @param key The string containing the key value.
161 * @param value The string containing the value.
162 * @param depth The number of tabs to indent the new node.
163 *
164 * @return The newly created dict node.
165 */
166xmlNode *add_key_dict_node(xmlDocPtr plist, xmlNode * dict, const char *key, const char *value, int depth)
167{
168 xmlNode *child;
169
170 add_child_to_plist(plist, "key", key, dict, depth);
171 child = add_child_to_plist(plist, "dict", value, dict, depth);
172
173 return child;
174}
175
176/** Adds a new data dictionary key-pair to a plist XML document.
177 *
178 * @param plist The plist XML document to add the new node to.
179 * @param dict The dictionary node within the plist XML document to add the new node to.
180 * @param key The string containing the key value.
181 * @param value The string containing the value.
182 * @param depth The number of tabs to indent the new node.
183 *
184 * @return The newly created key node.
185 */
186xmlNode *add_key_data_dict_element(xmlDocPtr plist, xmlNode * dict, const char *key, const char *value, int depth)
187{
188 xmlNode *keyPtr;
189
190 keyPtr = add_child_to_plist(plist, "key", key, dict, depth);
191 add_child_to_plist(plist, "data", format_string(value, 60, depth), dict, depth);
192
193 return keyPtr;
194}
195
196/** Reads a set of keys and strings into an array from a plist XML document.
197 *
198 * @param dict The root XMLNode of a plist XML document to be read.
199 *
200 * @return An array where each even number is a key and the odd numbers are
201 * values. If the odd number is \0, that's the end of the list.
202 */
203char **read_dict_element_strings(xmlNode * dict)
204{
205 char **return_me = NULL, **old = NULL;
206 int current_length = 0;
207 int current_pos = 0;
208 xmlNode *dict_walker;
209
210 for (dict_walker = dict->children; dict_walker; dict_walker = dict_walker->next) {
211 if (!xmlStrcmp(dict_walker->name, "key")) {
212 current_length += 2;
213 old = return_me;
214 return_me = realloc(return_me, sizeof(char *) * current_length);
215 if (!return_me) {
216 free(old);
217 return NULL;
218 }
219 return_me[current_pos++] = xmlNodeGetContent(dict_walker);
220 return_me[current_pos++] = xmlNodeGetContent(dict_walker->next->next);
221 }
222 }
223
224 old = return_me;
225 return_me = realloc(return_me, sizeof(char *) * (current_length + 1));
226 return_me[current_pos] = NULL;
227
228 return return_me;
229}
230
231/** Destroys a dictionary as returned by read_dict_element_strings
232 */
233void free_dictionary(char **dictionary)
234{
235 int i = 0;
236
237 if (!dictionary)
238 return;
239
240 for (i = 0; dictionary[i]; i++) {
241 free(dictionary[i]);
242 }
243
244 free(dictionary);
245}
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