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
|
/*
IMMS: Intelligent Multimedia Management System
Copyright (C) 2001-2009 Michael Grigoriev
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#ifndef __MD5DIGEST_H
#define __MD5DIGEST_H
#include <string>
#include <stdio.h>
#include "md5.h"
#include <string.h>
using std::string;
#define NUMBLOCKS 256
#define BLOCKSIZE 4096
#define OFFSET (long) (- NUMBLOCKS * BLOCKSIZE)
#define TAGOFFSET (long) (-128)
class Md5Digest
{
public:
static string digest_file(string filename)
{
static unsigned char bin_buffer[128 / 8];
static char hex_buf[34] = {'\0'};
static char tag_buf[4] = {'\0'};
FILE *fp = fopen(filename.c_str(), "r");
if (!fp)
return "bad_checksum";
long offset = OFFSET;
fseek(fp, TAGOFFSET, SEEK_END);
fread(tag_buf, 4, 1, fp);
if (!strncmp(tag_buf, "TAG", 3))
offset += TAGOFFSET;
int res = fseek(fp, offset, SEEK_END);
if (res)
rewind(fp);
int err = md5_stream(fp, NUMBLOCKS, bin_buffer);
fclose(fp);
if (err)
return "bad_checksum";
char *cur = hex_buf;
for (int i = 0; i < (128 / 4 / 2); ++i)
cur += sprintf(cur, "%02x", bin_buffer[i]);
return hex_buf;
}
};
#endif
|