Openssl 1.1.0h

crypto/o_fopen.c

@@ -0,0 +1,103 @@
+/*
+ * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (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
+ */
+
+#include "internal/cryptlib.h"
+
+#if !defined(OPENSSL_NO_STDIO)
+
+# include <stdio.h>
+
+FILE *openssl_fopen(const char *filename, const char *mode)
+{
+    FILE *file = NULL;
+# if defined(_WIN32) && defined(CP_UTF8)
+    int sz, len_0 = (int)strlen(filename) + 1;
+    DWORD flags;
+
+    /*
+     * 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, 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 (!HAS_LFN_SUPPORT(filename)) {
+            char *iterator;
+            char lastchar;
+
+            newname = OPENSSL_malloc(strlen(filename) + 1);
+            if (newname == 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