mirror of https://github.com/openssl/openssl.git
127 lines
4.3 KiB
C
127 lines
4.3 KiB
C
/*
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* Copyright 2016-2022 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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# if defined(__linux) || defined(__sun) || defined(__hpux)
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/*
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* Following definition aliases fopen to fopen64 on above mentioned
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* platforms. This makes it possible to open and sequentially access files
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* larger than 2GB from 32-bit application. It does not allow one to traverse
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* them beyond 2GB with fseek/ftell, but on the other hand *no* 32-bit
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* platform permits that, not with fseek/ftell. Not to mention that breaking
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* 2GB limit for seeking would require surgery to *our* API. But sequential
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* access suffices for practical cases when you can run into large files,
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* such as fingerprinting, so we can let API alone. For reference, the list
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* of 32-bit platforms which allow for sequential access of large files
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* without extra "magic" comprise *BSD, Darwin, IRIX...
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*/
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# ifndef _FILE_OFFSET_BITS
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# define _FILE_OFFSET_BITS 64
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# endif
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# endif
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#include "internal/e_os.h"
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#include "internal/cryptlib.h"
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#if !defined(OPENSSL_NO_STDIO)
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# include <stdio.h>
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# ifdef __DJGPP__
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# include <unistd.h>
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# endif
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FILE *openssl_fopen(const char *filename, const char *mode)
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{
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FILE *file = NULL;
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# if defined(_WIN32) && defined(CP_UTF8)
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int sz, len_0 = (int)strlen(filename) + 1;
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DWORD flags;
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/*
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* Basically there are three cases to cover: a) filename is
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* pure ASCII string; b) actual UTF-8 encoded string and
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* c) locale-ized string, i.e. one containing 8-bit
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* characters that are meaningful in current system locale.
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* If filename is pure ASCII or real UTF-8 encoded string,
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* MultiByteToWideChar succeeds and _wfopen works. If
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* filename is locale-ized string, chances are that
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* MultiByteToWideChar fails reporting
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* ERROR_NO_UNICODE_TRANSLATION, in which case we fall
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* back to fopen...
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*/
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if ((sz = MultiByteToWideChar(CP_UTF8, (flags = MB_ERR_INVALID_CHARS),
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filename, len_0, NULL, 0)) > 0 ||
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(GetLastError() == ERROR_INVALID_FLAGS &&
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(sz = MultiByteToWideChar(CP_UTF8, (flags = 0),
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filename, len_0, NULL, 0)) > 0)
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) {
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WCHAR wmode[8];
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WCHAR *wfilename = _alloca(sz * sizeof(WCHAR));
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if (MultiByteToWideChar(CP_UTF8, flags,
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filename, len_0, wfilename, sz) &&
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MultiByteToWideChar(CP_UTF8, 0, mode, strlen(mode) + 1,
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wmode, OSSL_NELEM(wmode)) &&
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(file = _wfopen(wfilename, wmode)) == NULL &&
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(errno == ENOENT || errno == EBADF)
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) {
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/*
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* UTF-8 decode succeeded, but no file, filename
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* could still have been locale-ized...
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*/
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file = fopen(filename, mode);
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}
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} else if (GetLastError() == ERROR_NO_UNICODE_TRANSLATION) {
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file = fopen(filename, mode);
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}
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# elif defined(__DJGPP__)
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{
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char *newname = NULL;
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if (pathconf(filename, _PC_NAME_MAX) <= 12) { /* 8.3 file system? */
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char *iterator;
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char lastchar;
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if ((newname = OPENSSL_malloc(strlen(filename) + 1)) == NULL) {
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ERR_raise(ERR_LIB_CRYPTO, ERR_R_MALLOC_FAILURE);
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return NULL;
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}
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for (iterator = newname, lastchar = '\0';
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*filename; filename++, iterator++) {
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if (lastchar == '/' && filename[0] == '.'
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&& filename[1] != '.' && filename[1] != '/') {
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/* Leading dots are not permitted in plain DOS. */
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*iterator = '_';
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} else {
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*iterator = *filename;
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}
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lastchar = *filename;
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}
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*iterator = '\0';
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filename = newname;
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}
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file = fopen(filename, mode);
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OPENSSL_free(newname);
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}
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# else
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file = fopen(filename, mode);
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# endif
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return file;
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}
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#else
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void *openssl_fopen(const char *filename, const char *mode)
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{
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return NULL;
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}
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#endif
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