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
|
/* GLIB - Library of useful routines for C programming
*
* gconvert.c: Convert between character sets using iconv
* Copyright Red Hat Inc., 2000
* Authors: Havoc Pennington <hp@redhat.com>, Owen Taylor <otaylor@redhat.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 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/* The array below is taken from gconvert.c, which is licensed by GNU Lesser General Public License
* Code to escape string is also taken partially from gconvert.c
* File name is changed to media-thumb-hash.c
*/
#include "md5.h"
#include <string.h>
#include <alloca.h>
#include <media-util-err.h>
static const char ACCEPTABLE_URI_CHARS[96] = {
/* ! " # $ % & ' ( ) * + , - . / */
0x00, 0x3F, 0x20, 0x20, 0x28, 0x00, 0x2C, 0x3F, 0x3F, 0x3F, 0x3F, 0x2A,
0x28, 0x3F, 0x3F, 0x1C,
/* 0 1 2 3 4 5 6 7 8 9 : ; < = > ? */
0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x38, 0x20,
0x20, 0x2C, 0x20, 0x20,
/* @ A B C D E F G H I J K L M N O */
0x38, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
0x3F, 0x3F, 0x3F, 0x3F,
/* P Q R S T U V W X Y Z [ \ ] ^ _ */
0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x20,
0x20, 0x20, 0x20, 0x3F,
/* ` a b c d e f g h i j k l m n o */
0x20, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
0x3F, 0x3F, 0x3F, 0x3F,
/* p q r s t u v w x y z { | } ~ DEL */
0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x20,
0x20, 0x20, 0x3F, 0x20
};
char *_media_thumb_generate_hash_name(const char *file)
{
int n;
MD5_CTX ctx;
static char md5out[(2 * MD5_HASHBYTES) + 1];
unsigned char hash[MD5_HASHBYTES];
static const char hex[] = "0123456789abcdef";
char *uri;
char *t;
const unsigned char *c;
int length;
if (!file) {
return NULL;
}
length = 3 * strlen(file) + 9;
memset(md5out, 0, sizeof(md5out));
#define _check_uri_char(c) \
((c) >= 32 && (c) < 128 && (ACCEPTABLE_URI_CHARS[(c) - 32] & 0x08))
uri = alloca(length);
if (uri == NULL) {
return NULL;
}
strncpy(uri, "file://", length);
uri[length - 1] = '\0';
t = uri + sizeof("file://") - 1;
for (c = (const unsigned char *)file; *c != '\0'; c++) {
if (!_check_uri_char(*c)) {
*t++ = '%';
*t++ = hex[*c >> 4];
*t++ = hex[*c & 15];
} else {
*t++ = *c;
}
}
*t = '\0';
#undef _check_uri_char
MD5Init(&ctx);
MD5Update(&ctx, (unsigned char const *)uri, (unsigned)strlen(uri));
MD5Final(hash, &ctx);
for (n = 0; n < MD5_HASHBYTES; n++) {
md5out[2 * n] = hex[hash[n] >> 4];
md5out[2 * n + 1] = hex[hash[n] & 0x0f];
}
md5out[2 * n] = '\0';
return md5out;
}
|
