1 /* 2 * Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the OpenSSL license (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 { 40 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 file = fopen(filename, mode); 115 # endif 116 return file; 117 } 118 119 #else 120 121 void *openssl_fopen(const char *filename, const char *mode) 122 { 123 return NULL; 124 } 125 126 #endif 127