1 /* -*- Mode: C; tab-width: 3; indent-tabs-mode: nil; c-basic-offset: 3 -*- */
2
3 /*
4 * GImageView
5 * Copyright (C) 2001-2003 Takuro Ashie
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program 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
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 *
21 * $Id: compare_md5.c,v 1.4 2004/04/08 10:38:50 makeinu Exp $
22 */
23
24 /*
25 * 2003-05-17 Takuro Ashie <ashie@homa.ne.jp>
26 *
27 * Fetched from textutils-2.1 and adapt to GImageView.
28 *
29 * Copyright (C) 1995-2002 Free Software Foundation, Inc.
30 * Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>.
31 */
32
33 #include <string.h>
34 #include <stdio.h>
35 #include <sys/types.h>
36
37 #include "gimv_dupl_finder.h"
38 #include "gimv_image_info.h"
39 #include "gimv_thumb.h"
40 #include "md5.h"
41
42
43 /* Most systems do not distinguish between external and internal
44 text representations. */
45 /* FIXME: This begs for an autoconf test. */
46 #if O_BINARY
47 # define OPENOPTS(BINARY) ((BINARY) != 0 ? TEXT1TO1 : TEXTCNVT)
48 # define TEXT1TO1 "rb"
49 # define TEXTCNVT "r"
50 #else
51 # if defined VMS
52 # define OPENOPTS(BINARY) ((BINARY) != 0 ? TEXT1TO1 : TEXTCNVT)
53 # define TEXT1TO1 "rb", "ctx=stm"
54 # define TEXTCNVT "r", "ctx=stm"
55 # else
56 # if UNIX || __UNIX__ || unix || __unix__ || _POSIX_VERSION
57 # define OPENOPTS(BINARY) "r"
58 # else
59 /* The following line is intended to evoke an error.
60 Using #error is not portable enough. */
61 "Cannot determine system type."
62 # endif
63 # endif
64 #endif
65
66 #define DIGEST_BIN_BYTES (128 / 8)
67
68 static gboolean
69 digest_file (const gchar *filename, gint binary, guchar *bin_result)
70 {
71 FILE *fp;
72 gint err;
73
74 fp = fopen (filename, OPENOPTS (binary));
75 if (fp == NULL)
76 return FALSE;
77
78 err = md5_stream (fp, bin_result);
79 if (err) {
80 fclose (fp);
81 return FALSE;
82 }
83
84 if (fclose (fp) == EOF)
85 return FALSE;
86
87 return TRUE;
88 }
89
90
91 static gpointer
duplicates_md5_get_data(GimvThumb * thumb)92 duplicates_md5_get_data (GimvThumb *thumb)
93 {
94 const gchar *filename;
95 gchar *temp_file = NULL;
96 guchar bin_buffer[DIGEST_BIN_BYTES + 1];
97 gboolean success;
98
99 g_return_val_if_fail (GIMV_IS_THUMB(thumb), NULL);
100 g_return_val_if_fail (thumb->info, NULL);
101
102 if (gimv_image_info_need_temp_file (thumb->info)) {
103 temp_file = gimv_image_info_get_temp_file (thumb->info);
104 filename = temp_file;
105 } else {
106 filename = gimv_image_info_get_path (thumb->info);
107 }
108
109 g_return_val_if_fail (filename && *filename, NULL);
110
111 success = digest_file (filename, TRUE, bin_buffer);
112 if (!success)
113 return NULL;
114
115 bin_buffer[DIGEST_BIN_BYTES] = '\0';
116
117 return g_strdup (bin_buffer);
118 }
119
120
121 static gint
duplicates_md5_compare(gpointer data1,gpointer data2,gfloat * similarity)122 duplicates_md5_compare (gpointer data1, gpointer data2, gfloat *similarity)
123 {
124 const gchar *str1 = data1, *str2 = data2;
125 gint retval;
126
127 if (!str1)
128 return str2 ? 1 : 0;
129 else if (!str2)
130 return 1;
131
132 retval = strcmp (str1, str2);
133
134 if (!retval)
135 *similarity = 1.0;
136 else
137 *similarity = 0.0;
138
139 return retval;
140 }
141
142
143 static void
duplicates_md5_data_delete(gpointer data)144 duplicates_md5_data_delete (gpointer data)
145 {
146 g_free (data);
147 }
148
149
150 GimvDuplCompFuncTable gimv_dupl_md5_funcs =
151 {
152 label: N_("md5sum"),
153 get_data: duplicates_md5_get_data,
154 compare: duplicates_md5_compare,
155 data_delete: duplicates_md5_data_delete,
156 };
157