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
|
/*
* Copyright (C) 2010, Nokia <ivan.frade@nokia.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include <errno.h>
#include <string.h>
#include <glib.h>
#include <libtracker-common/tracker-file-utils.h>
#include <gsf/gsf.h>
#include <gsf/gsf-infile.h>
#include <gsf/gsf-input-stdio.h>
#include <gsf/gsf-infile-zip.h>
#include "tracker-gsf.h"
/* Size of the buffer to use */
#define XML_BUFFER_SIZE 8192 /* bytes */
/* Note: 20 MBytes of max size is really assumed to be a safe limit. */
#define XML_MAX_BYTES_READ (20u << 20) /* bytes */
/**
* based on find_member() from vsd_utils.c:
* http://vsdump.sourcearchive.com/documentation/0.0.44/vsd__utils_8c-source.html
*/
static GsfInput *
find_member (GsfInfile *arch,
gchar const *name)
{
gchar const *slash;
slash = strchr (name, '/');
if (slash) {
gchar *dirname;
GsfInput *member;
dirname = g_strndup (name, slash - name);
/**
* Ignore if the directory is the current one that is ".".
* Go to next direcotry if exists
*/
if (strcmp (dirname, ".") == 0) {
member = find_member (arch, slash + 1);
} else if ((member = gsf_infile_child_by_name (arch, dirname)) != NULL) {
GsfInfile *dir;
dir = GSF_INFILE (member);
member = find_member (dir, slash + 1);
g_object_unref (dir);
}
g_free (dirname);
return member;
} else {
return gsf_infile_child_by_name (arch, name);
}
}
/**
* tracker_gsf_parse_xml_in_zip:
* @zip_file_uri: URI of the ZIP archive
* @xml_filename: Name of the XML file stored inside the ZIP archive
* @context: Markup context to be used when parsing the XML
*
* This function reads and parses the contents of an XML file stored
* inside a ZIP compressed archive. Reading and parsing is done buffered, and
* maximum size of the uncompressed XML file is limited to be to 20MBytes.
*/
void
tracker_gsf_parse_xml_in_zip (const gchar *zip_file_uri,
const gchar *xml_filename,
GMarkupParseContext *context,
GError **err)
{
gchar *filename;
GError *error = NULL;
GsfInfile *infile = NULL;
GsfInput *src = NULL;
GsfInput *member = NULL;
FILE *file;
g_debug ("Parsing '%s' XML file contained inside zip archive...",
xml_filename);
/* Get filename from the given URI */
if ((filename = g_filename_from_uri (zip_file_uri,
NULL, &error)) == NULL) {
g_warning ("Can't get filename from uri '%s': %s",
zip_file_uri, error ? error->message : "no error given");
} else { /* Create a new Input GSF object for the given file */
file = tracker_file_open (filename);
if (!file) {
g_warning ("Can't open file from uri '%s': %s",
zip_file_uri, g_strerror (errno));
} else if ((src = gsf_input_stdio_new_FILE (filename, file, TRUE)) == NULL) {
g_warning ("Failed creating a GSF Input object for '%s': %s",
zip_file_uri, error ? error->message : "no error given");
}
/* Input object is a Zip file */
else if ((infile = gsf_infile_zip_new (src, &error)) == NULL) {
g_warning ("'%s' Not a zip file: %s",
zip_file_uri, error ? error->message : "no error given");
}
/* Look for requested filename inside the ZIP file */
else if ((member = find_member (infile, xml_filename)) == NULL) {
g_warning ("No member '%s' in zip file '%s'",
xml_filename, zip_file_uri);
}
/* Load whole contents of the internal file in the xml buffer */
else {
guint8 buf[XML_BUFFER_SIZE];
size_t remaining_size, chunk_size, accum;
/* Get whole size of the contents to read */
remaining_size = (size_t) gsf_input_size (GSF_INPUT (member));
/* Note that gsf_input_read() needs to be able to read ALL specified
* number of bytes, or it will fail */
chunk_size = MIN (remaining_size, XML_BUFFER_SIZE);
accum = 0;
while (!error &&
accum <= XML_MAX_BYTES_READ &&
chunk_size > 0 &&
gsf_input_read (GSF_INPUT (member), chunk_size, buf) != NULL) {
/* update accumulated count */
accum += chunk_size;
/* Pass the read stream to the context parser... */
g_markup_parse_context_parse (context, buf, chunk_size, &error);
/* update bytes to be read */
remaining_size -= chunk_size;
chunk_size = MIN (remaining_size, XML_BUFFER_SIZE);
}
}
if (file) {
tracker_file_close (file, FALSE);
}
}
g_free (filename);
if (error)
g_propagate_error (err, error);
if (infile)
g_object_unref (infile);
if (src)
g_object_unref (src);
if (member)
g_object_unref (member);
}
|
