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
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
/*
* Copyright 2016-2025 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#if defined(__linux) || defined(__sun) || defined(__hpux)
/*
* Following definition aliases fopen to fopen64 on above mentioned
* platforms. This makes it possible to open and sequentially access files
* larger than 2GB from 32-bit application. It does not allow one to traverse
* them beyond 2GB with fseek/ftell, but on the other hand *no* 32-bit
* platform permits that, not with fseek/ftell. Not to mention that breaking
* 2GB limit for seeking would require surgery to *our* API. But sequential
* access suffices for practical cases when you can run into large files,
* such as fingerprinting, so we can let API alone. For reference, the list
* of 32-bit platforms which allow for sequential access of large files
* without extra "magic" comprise *BSD, Darwin, IRIX...
*/
#ifndef _FILE_OFFSET_BITS
#define _FILE_OFFSET_BITS 64
#endif
#endif
#include "internal/e_os.h"
#include "internal/cryptlib.h"
#if !defined(OPENSSL_NO_STDIO)
#include <stdio.h>
#ifdef __DJGPP__
#include <unistd.h>
#endif
FILE *openssl_fopen(const char *filename, const char *mode)
{
FILE *file = NULL;
#if defined(_WIN32) && defined(CP_UTF8)
int sz, len_0;
DWORD flags;
#endif
if (filename == NULL)
return NULL;
#if defined(_WIN32) && defined(CP_UTF8)
len_0 = (int)strlen(filename) + 1;
/*
* Basically there are three cases to cover: a) filename is
* pure ASCII string; b) actual UTF-8 encoded string and
* c) locale-ized string, i.e. one containing 8-bit
* characters that are meaningful in current system locale.
* If filename is pure ASCII or real UTF-8 encoded string,
* MultiByteToWideChar succeeds and _wfopen works. If
* filename is locale-ized string, chances are that
* MultiByteToWideChar fails reporting
* ERROR_NO_UNICODE_TRANSLATION, in which case we fall
* back to fopen...
*/
if ((sz = MultiByteToWideChar(CP_UTF8, (flags = MB_ERR_INVALID_CHARS),
filename, len_0, NULL, 0))
> 0
|| (GetLastError() == ERROR_INVALID_FLAGS && (sz = MultiByteToWideChar(CP_UTF8, (flags = 0), filename, len_0, NULL, 0)) > 0)) {
WCHAR wmode[8];
WCHAR *wfilename = _alloca(sz * sizeof(WCHAR));
if (MultiByteToWideChar(CP_UTF8, flags,
filename, len_0, wfilename, sz)
&& MultiByteToWideChar(CP_UTF8, 0, mode, (int)(strlen(mode) + 1),
wmode, OSSL_NELEM(wmode))
&& (file = _wfopen(wfilename, wmode)) == NULL && (errno == ENOENT || errno == EBADF)) {
/*
* UTF-8 decode succeeded, but no file, filename
* could still have been locale-ized...
*/
file = fopen(filename, mode);
}
} else if (GetLastError() == ERROR_NO_UNICODE_TRANSLATION) {
file = fopen(filename, mode);
}
#elif defined(__DJGPP__)
{
char *newname = NULL;
if (pathconf(filename, _PC_NAME_MAX) <= 12) { /* 8.3 file system? */
char *iterator;
char lastchar;
if ((newname = OPENSSL_malloc(strlen(filename) + 1)) == NULL)
return NULL;
for (iterator = newname, lastchar = '\0';
*filename; filename++, iterator++) {
if (lastchar == '/' && filename[0] == '.'
&& filename[1] != '.' && filename[1] != '/') {
/* Leading dots are not permitted in plain DOS. */
*iterator = '_';
} else {
*iterator = *filename;
}
lastchar = *filename;
}
*iterator = '\0';
filename = newname;
}
file = fopen(filename, mode);
OPENSSL_free(newname);
}
#else
file = fopen(filename, mode);
#endif
return file;
}
#else
void *openssl_fopen(const char *filename, const char *mode)
{
return NULL;
}
#endif
|
