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1 | /* | |
2 | * viking -- GPS Data and Topo Analyzer, Explorer, and Manager | |
3 | * | |
4 | * Copyright (C) 2003-2005, Evan Battaglia <gtoevan@gmx.net> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | * | |
20 | */ | |
21 | ||
22 | #ifdef HAVE_CONFIG_H | |
23 | #include "config.h" | |
24 | #endif | |
25 | ||
26 | #include <stdio.h> | |
27 | #include <ctype.h> | |
28 | #include <string.h> | |
29 | #include <glib.h> | |
30 | #include <glib/gstdio.h> | |
31 | #include <glib/gi18n.h> | |
32 | ||
33 | #include "download.h" | |
34 | ||
35 | #include "curl_download.h" | |
36 | ||
37 | static gboolean check_file_first_line(FILE* f, gchar *patterns[]) | |
38 | { | |
39 | gchar **s; | |
40 | gchar *bp; | |
41 | fpos_t pos; | |
42 | gchar buf[33]; | |
43 | size_t nr; | |
44 | ||
45 | memset(buf, 0, sizeof(buf)); | |
46 | fgetpos(f, &pos); | |
47 | rewind(f); | |
48 | nr = fread(buf, 1, sizeof(buf) - 1, f); | |
49 | fsetpos(f, &pos); | |
50 | for (bp = buf; (bp < (buf + sizeof(buf) - 1)) && (nr > (bp - buf)); bp++) { | |
51 | if (!(isspace(*bp))) | |
52 | break; | |
53 | } | |
54 | if ((bp >= (buf + sizeof(buf) -1)) || ((bp - buf) >= nr)) | |
55 | return FALSE; | |
56 | for (s = patterns; *s; s++) { | |
57 | if (strncasecmp(*s, bp, strlen(*s)) == 0) | |
58 | return TRUE; | |
59 | } | |
60 | return FALSE; | |
61 | } | |
62 | ||
63 | gboolean a_check_html_file(FILE* f) | |
64 | { | |
65 | gchar * html_str[] = { | |
66 | "<html", | |
67 | "<!DOCTYPE html", | |
68 | "<head", | |
69 | "<title", | |
70 | NULL | |
71 | }; | |
72 | ||
73 | return check_file_first_line(f, html_str); | |
74 | } | |
75 | ||
76 | gboolean a_check_map_file(FILE* f) | |
77 | { | |
78 | /* FIXME no more true since a_check_kml_file */ | |
79 | return !a_check_html_file(f); | |
80 | } | |
81 | ||
82 | gboolean a_check_kml_file(FILE* f) | |
83 | { | |
84 | gchar * kml_str[] = { | |
85 | "<?xml", | |
86 | NULL | |
87 | }; | |
88 | ||
89 | return check_file_first_line(f, kml_str); | |
90 | } | |
91 | ||
92 | static int download( const char *hostname, const char *uri, const char *fn, DownloadOptions *options, gboolean ftp) | |
93 | { | |
94 | FILE *f; | |
95 | int ret; | |
96 | gchar *tmpfilename; | |
97 | gboolean failure = FALSE; | |
98 | ||
99 | /* Check file */ | |
100 | if ( g_file_test ( fn, G_FILE_TEST_EXISTS ) == TRUE ) | |
101 | { | |
102 | /* File exists: return */ | |
103 | return -3; | |
104 | } else { | |
105 | gchar *dir = g_path_get_dirname ( fn ); | |
106 | g_mkdir_with_parents ( dir , 0777 ); | |
107 | g_free ( dir ); | |
108 | ||
109 | /* create placeholder file */ | |
110 | if ( ! (f = g_fopen ( fn, "w+b" )) ) /* immediately open file so other threads won't -- prevents race condition */ | |
111 | return -4; | |
112 | fclose ( f ); | |
113 | f = NULL; | |
114 | } | |
115 | ||
116 | tmpfilename = g_strdup_printf("%s.tmp", fn); | |
117 | f = g_fopen ( tmpfilename, "w+b" ); | |
118 | if ( ! f ) { | |
119 | g_free ( tmpfilename ); | |
120 | g_remove ( fn ); /* couldn't create temporary. delete 0-byte file. */ | |
121 | return -4; | |
122 | } | |
123 | ||
124 | /* Call the backend function */ | |
125 | ret = curl_download_get_url ( hostname, uri, f, options, ftp ); | |
126 | if (ret == -1 || ret == 1 || ret == -2) { | |
127 | g_debug("%s: download failed: curl_download_get_url=%d", __FUNCTION__, ret); | |
128 | failure = TRUE; | |
129 | } | |
130 | ||
131 | if (!failure && options != NULL && options->check_file != NULL && ! options->check_file(f)) { | |
132 | g_debug("%s: file content checking failed", __FUNCTION__); | |
133 | failure = TRUE; | |
134 | } | |
135 | ||
136 | if (failure) | |
137 | { | |
138 | g_warning(_("Download error: %s"), fn); | |
139 | fclose ( f ); | |
140 | f = NULL; | |
141 | g_remove ( tmpfilename ); | |
142 | g_free ( tmpfilename ); | |
143 | g_remove ( fn ); /* couldn't create temporary. delete 0-byte file. */ | |
144 | return -1; | |
145 | } | |
146 | ||
147 | fclose ( f ); | |
148 | f = NULL; | |
149 | g_rename ( tmpfilename, fn ); /* move completely-downloaded file to permanent location */ | |
150 | g_free ( tmpfilename ); | |
151 | return ret; | |
152 | } | |
153 | ||
154 | /* success = 0, -1 = couldn't connect, -2 HTTP error, -3 file exists, -4 couldn't write to file... */ | |
155 | /* uri: like "/uri.html?whatever" */ | |
156 | /* only reason for the "wrapper" is so we can do redirects. */ | |
157 | int a_http_download_get_url ( const char *hostname, const char *uri, const char *fn, DownloadOptions *opt ) | |
158 | { | |
159 | return download ( hostname, uri, fn, opt, FALSE ); | |
160 | } | |
161 | ||
162 | int a_ftp_download_get_url ( const char *hostname, const char *uri, const char *fn, DownloadOptions *opt ) | |
163 | { | |
164 | return download ( hostname, uri, fn, opt, TRUE ); | |
165 | } |