Coverage Report

Created: 2024-01-20 12:36

/src/openssl/crypto/o_fopen.c
Line
Count
Source
1
/*
2
 * Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
3
 *
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
8
 */
9
10
# if defined(__linux) || defined(__sun) || defined(__hpux)
11
/*
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...
22
 */
23
#  ifndef _FILE_OFFSET_BITS
24
#   define _FILE_OFFSET_BITS 64
25
#  endif
26
# endif
27
28
#include "e_os.h"
29
#include "internal/cryptlib.h"
30
31
#if !defined(OPENSSL_NO_STDIO)
32
33
# include <stdio.h>
34
# ifdef __DJGPP__
35
#  include <unistd.h>
36
# endif
37
38
FILE *openssl_fopen(const char *filename, const char *mode)
39
1.23k
{
40
1.23k
    FILE *file = NULL;
41
# if defined(_WIN32) && defined(CP_UTF8)
42
    int sz, len_0 = (int)strlen(filename) + 1;
43
    DWORD flags;
44
45
    /*
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
55
     * back to fopen...
56
     */
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)
62
        ) {
63
        WCHAR wmode[8];
64
        WCHAR *wfilename = _alloca(sz * sizeof(WCHAR));
65
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)
72
            ) {
73
            /*
74
             * UTF-8 decode succeeded, but no file, filename
75
             * could still have been locale-ized...
76
             */
77
            file = fopen(filename, mode);
78
        }
79
    } else if (GetLastError() == ERROR_NO_UNICODE_TRANSLATION) {
80
        file = fopen(filename, mode);
81
    }
82
# elif defined(__DJGPP__)
83
    {
84
        char *newname = NULL;
85
86
        if (pathconf(filename, _PC_NAME_MAX) <= 12) {  /* 8.3 file system? */
87
            char *iterator;
88
            char lastchar;
89
90
            if ((newname = OPENSSL_malloc(strlen(filename) + 1)) == NULL) {
91
                CRYPTOerr(CRYPTO_F_OPENSSL_FOPEN, ERR_R_MALLOC_FAILURE);
92
                return NULL;
93
            }
94
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. */
100
                    *iterator = '_';
101
                } else {
102
                    *iterator = *filename;
103
                }
104
                lastchar = *filename;
105
            }
106
            *iterator = '\0';
107
            filename = newname;
108
        }
109
        file = fopen(filename, mode);
110
111
        OPENSSL_free(newname);
112
    }
113
# else
114
1.23k
    file = fopen(filename, mode);
115
1.23k
# endif
116
1.23k
    return file;
117
1.23k
}
118
119
#else
120
121
void *openssl_fopen(const char *filename, const char *mode)
122
{
123
    return NULL;
124
}
125
126
#endif