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[proxmark3-svn] / client / loclass / fileutils.c
1 /*****************************************************************************
2 * WARNING
3 *
4 * THIS CODE IS CREATED FOR EXPERIMENTATION AND EDUCATIONAL USE ONLY.
5 *
6 * USAGE OF THIS CODE IN OTHER WAYS MAY INFRINGE UPON THE INTELLECTUAL
7 * PROPERTY OF OTHER PARTIES, SUCH AS INSIDE SECURE AND HID GLOBAL,
8 * AND MAY EXPOSE YOU TO AN INFRINGEMENT ACTION FROM THOSE PARTIES.
9 *
10 * THIS CODE SHOULD NEVER BE USED TO INFRINGE PATENTS OR INTELLECTUAL PROPERTY RIGHTS.
11 *
12 *****************************************************************************
13 *
14 * This file is part of loclass. It is a reconstructon of the cipher engine
15 * used in iClass, and RFID techology.
16 *
17 * The implementation is based on the work performed by
18 * Flavio D. Garcia, Gerhard de Koning Gans, Roel Verdult and
19 * Milosch Meriac in the paper "Dismantling IClass".
20 *
21 * Copyright (C) 2014 Martin Holst Swende
22 *
23 * This is free software: you can redistribute it and/or modify
24 * it under the terms of the GNU General Public License version 2 as published
25 * by the Free Software Foundation.
26 *
27 * This file is distributed in the hope that it will be useful,
28 * but WITHOUT ANY WARRANTY; without even the implied warranty of
29 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
30 * GNU General Public License for more details.
31 *
32 * You should have received a copy of the GNU General Public License
33 * along with loclass. If not, see <http://www.gnu.org/licenses/>.
34 *
35 *
36 *
37 ****************************************************************************/
38
39 #include <stdio.h>
40 #include <string.h>
41 #include <stdlib.h>
42 #include <sys/stat.h>
43 #include <stdarg.h>
44 #include "fileutils.h"
45 #include "ui.h"
46 /**
47 * @brief checks if a file exists
48 * @param filename
49 * @return
50 */
51 int fileExists(const char *filename) {
52
53 #ifdef _WIN32
54 struct _stat st;
55 int result = _stat(filename, &st);
56 #else
57 struct stat st;
58 int result = stat(filename, &st);
59 #endif
60 return result == 0;
61 }
62
63 int saveFile(const char *preferredName, const char *suffix, const void* data, size_t datalen)
64 {
65 int size = sizeof(char) * (strlen(preferredName)+strlen(suffix)+10);
66 char * fileName = malloc(size);
67
68 memset(fileName,0,size);
69 int num = 1;
70 sprintf(fileName,"%s.%s", preferredName, suffix);
71 while(fileExists(fileName))
72 {
73 sprintf(fileName,"%s-%d.%s", preferredName, num, suffix);
74 num++;
75 }
76 /* We should have a valid filename now, e.g. dumpdata-3.bin */
77
78 /*Opening file for writing in binary mode*/
79 FILE *fileHandle=fopen(fileName,"wb");
80 if(!fileHandle) {
81 prnlog("Failed to write to file '%s'", fileName);
82 free(fileName);
83 return 1;
84 }
85 fwrite(data, 1, datalen, fileHandle);
86 fclose(fileHandle);
87 prnlog("Saved data to '%s'", fileName);
88 free(fileName);
89
90 return 0;
91 }
92
93 /**
94 * Utility function to print to console. This is used consistently within the library instead
95 * of printf, but it actually only calls printf (and adds a linebreak).
96 * The reason to have this method is to
97 * make it simple to plug this library into proxmark, which has this function already to
98 * write also to a logfile. When doing so, just delete this function.
99 * @param fmt
100 */
101 void prnlog(char *fmt, ...)
102 {
103 char buffer[2048] = {0};
104 va_list args;
105 va_start(args,fmt);
106 vsprintf (buffer,fmt, args);
107 va_end(args);
108 PrintAndLog(buffer);
109
110 }
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