2 * Copyright 2016-2020 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 # if defined(__linux) || defined(__sun) || defined(__hpux)
12 * Following definition aliases fopen to fopen64 on above mentioned
13 * platforms. This makes it possible to open and sequentially access files
14 * larger than 2GB from 32-bit application. It does not allow to traverse
15 * them beyond 2GB with fseek/ftell, but on the other hand *no* 32-bit
16 * platform permits that, not with fseek/ftell. Not to mention that breaking
17 * 2GB limit for seeking would require surgery to *our* API. But sequential
18 * access suffices for practical cases when you can run into large files,
19 * such as fingerprinting, so we can let API alone. For reference, the list
20 * of 32-bit platforms which allow for sequential access of large files
21 * without extra "magic" comprise *BSD, Darwin, IRIX...
23 # ifndef _FILE_OFFSET_BITS
24 # define _FILE_OFFSET_BITS 64
29 #include "internal/cryptlib.h"
31 #if !defined(OPENSSL_NO_STDIO)
38 FILE *openssl_fopen(const char *filename
, const char *mode
)
41 # if defined(_WIN32) && defined(CP_UTF8)
42 int sz
, len_0
= (int)strlen(filename
) + 1;
46 * Basically there are three cases to cover: a) filename is
47 * pure ASCII string; b) actual UTF-8 encoded string and
48 * c) locale-ized string, i.e. one containing 8-bit
49 * characters that are meaningful in current system locale.
50 * If filename is pure ASCII or real UTF-8 encoded string,
51 * MultiByteToWideChar succeeds and _wfopen works. If
52 * filename is locale-ized string, chances are that
53 * MultiByteToWideChar fails reporting
54 * ERROR_NO_UNICODE_TRANSLATION, in which case we fall
57 if ((sz
= MultiByteToWideChar(CP_UTF8
, (flags
= MB_ERR_INVALID_CHARS
),
58 filename
, len_0
, NULL
, 0)) > 0 ||
59 (GetLastError() == ERROR_INVALID_FLAGS
&&
60 (sz
= MultiByteToWideChar(CP_UTF8
, (flags
= 0),
61 filename
, len_0
, NULL
, 0)) > 0)
64 WCHAR
*wfilename
= _alloca(sz
* sizeof(WCHAR
));
66 if (MultiByteToWideChar(CP_UTF8
, flags
,
67 filename
, len_0
, wfilename
, sz
) &&
68 MultiByteToWideChar(CP_UTF8
, 0, mode
, strlen(mode
) + 1,
69 wmode
, OSSL_NELEM(wmode
)) &&
70 (file
= _wfopen(wfilename
, wmode
)) == NULL
&&
71 (errno
== ENOENT
|| errno
== EBADF
)
74 * UTF-8 decode succeeded, but no file, filename
75 * could still have been locale-ized...
77 file
= fopen(filename
, mode
);
79 } else if (GetLastError() == ERROR_NO_UNICODE_TRANSLATION
) {
80 file
= fopen(filename
, mode
);
82 # elif defined(__DJGPP__)
86 if (pathconf(filename
, _PC_NAME_MAX
) <= 12) { /* 8.3 file system? */
90 if ((newname
= OPENSSL_malloc(strlen(filename
) + 1)) == NULL
) {
91 ERR_raise(ERR_LIB_CRYPTO
, ERR_R_MALLOC_FAILURE
);
95 for (iterator
= newname
, lastchar
= '\0';
96 *filename
; filename
++, iterator
++) {
97 if (lastchar
== '/' && filename
[0] == '.'
98 && filename
[1] != '.' && filename
[1] != '/') {
99 /* Leading dots are not permitted in plain DOS. */
102 *iterator
= *filename
;
104 lastchar
= *filename
;
109 file
= fopen(filename
, mode
);
111 OPENSSL_free(newname
);
114 file
= fopen(filename
, mode
);
121 void *openssl_fopen(const char *filename
, const char *mode
)