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-rw-r--r--src/VBox/Runtime/common/misc/RTFileModeToFlags.cpp354
1 files changed, 354 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/misc/RTFileModeToFlags.cpp b/src/VBox/Runtime/common/misc/RTFileModeToFlags.cpp
new file mode 100644
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--- /dev/null
+++ b/src/VBox/Runtime/common/misc/RTFileModeToFlags.cpp
@@ -0,0 +1,354 @@
+/* $Id: RTFileModeToFlags.cpp $ */
+/** @file
+ * IPRT - RTFileModeToFlags.
+ */
+
+/*
+ * Copyright (C) 2013-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+* Header Files *
+*********************************************************************************************************************************/
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+#include <iprt/file.h>
+#include <iprt/string.h>
+#include "internal/iprt.h"
+
+
+RTR3DECL(int) RTFileModeToFlags(const char *pszMode, uint64_t *pfMode)
+{
+ AssertPtrReturn(pszMode, VERR_INVALID_POINTER);
+ AssertPtrReturn(pfMode, VERR_INVALID_POINTER);
+
+ const char *pszCur = pszMode;
+ if (*pszCur == '\0')
+ return VERR_INVALID_PARAMETER;
+
+ uint64_t fMode = 0;
+ char chPrev = '\0';
+ while ( pszCur
+ && *pszCur != '\0')
+ {
+ bool fSkip = false;
+ switch (*pszCur)
+ {
+ /* Opens an existing file for writing and places the
+ * file pointer at the end of the file. The file is
+ * created if it does not exist. */
+ case 'a':
+ if ((fMode & RTFILE_O_ACTION_MASK) == 0)
+ fMode |= RTFILE_O_OPEN_CREATE
+ | RTFILE_O_WRITE
+ | RTFILE_O_APPEND;
+ else
+ return VERR_INVALID_PARAMETER;
+ break;
+
+ case 'b': /* Binary mode. */
+ /* Just skip as being valid. */
+ fSkip = true;
+ break;
+
+ /* Creates a file or open an existing one for
+ * writing only. The file pointer will be placed
+ * at the beginning of the file.*/
+ case 'c':
+ if ((fMode & RTFILE_O_ACTION_MASK) == 0)
+ fMode |= RTFILE_O_OPEN_CREATE
+ | RTFILE_O_WRITE;
+ else
+ return VERR_INVALID_PARAMETER;
+ break;
+
+ /* Opens an existing file for reading and places the
+ * file pointer at the beginning of the file. If the
+ * file does not exist an error will be returned. */
+ case 'r':
+ if ((fMode & RTFILE_O_ACTION_MASK) == 0)
+ fMode |= RTFILE_O_OPEN
+ | RTFILE_O_READ;
+ else
+ return VERR_INVALID_PARAMETER;
+ break;
+
+ case 't': /* Text mode. */
+ /* Just skip as being valid. */
+ fSkip = true;
+ break;
+
+ /* Creates a new file or replaces an existing one
+ * for writing. Places the file pointer at the beginning.
+ * An existing file will be truncated to 0 bytes. */
+ case 'w':
+ if ((fMode & RTFILE_O_ACTION_MASK) == 0)
+ fMode |= RTFILE_O_CREATE_REPLACE
+ | RTFILE_O_WRITE
+ | RTFILE_O_TRUNCATE;
+ else
+ return VERR_INVALID_PARAMETER;
+ break;
+
+ /* Creates a new file and opens it for writing. Places
+ * the file pointer at the beginning. If the file
+ * exists an error will be returned. */
+ case 'x':
+ if ((fMode & RTFILE_O_ACTION_MASK) == 0)
+ fMode |= RTFILE_O_CREATE
+ | RTFILE_O_WRITE;
+ else
+ return VERR_INVALID_PARAMETER;
+ break;
+
+ case '+':
+ {
+ switch (chPrev)
+ {
+ case 'a':
+ case 'c':
+ case 'w':
+ case 'x':
+ /* Also open / create file with read access. */
+ fMode |= RTFILE_O_READ;
+ break;
+
+ case 'r':
+ /* Also open / create file with write access. */
+ fMode |= RTFILE_O_WRITE;
+ break;
+
+ case 'b':
+ case 't':
+ /* Silently eat skipped parameters. */
+ fSkip = true;
+ break;
+
+ case 0: /* No previous character yet. */
+ case '+':
+ /* Eat plusses which don't belong to a command. */
+ fSkip = true;
+ break;
+
+ default:
+ return VERR_INVALID_PARAMETER;
+ }
+
+ break;
+ }
+
+ default:
+ return VERR_INVALID_PARAMETER;
+ }
+
+ if (!fSkip)
+ chPrev = *pszCur;
+ pszCur++;
+ }
+
+ /* No action mask set? */
+ if ((fMode & RTFILE_O_ACTION_MASK) == 0)
+ return VERR_INVALID_PARAMETER;
+
+ /** @todo Handle sharing mode */
+ fMode |= RTFILE_O_DENY_NONE;
+
+ /* Return. */
+ *pfMode = fMode;
+ return VINF_SUCCESS;
+}
+RT_EXPORT_SYMBOL(RTFileModeToFlags);
+
+
+RTR3DECL(int) RTFileModeToFlagsEx(const char *pszAccess, const char *pszDisposition,
+ const char *pszSharing, uint64_t *pfMode)
+{
+ AssertPtrReturn(pszAccess, VERR_INVALID_POINTER);
+ AssertPtrReturn(pszDisposition, VERR_INVALID_POINTER);
+ AssertPtrNullReturn(pszSharing, VERR_INVALID_POINTER);
+ AssertPtrReturn(pfMode, VERR_INVALID_POINTER);
+
+ const char *pszCur = pszAccess;
+ if (*pszCur == '\0')
+ return VERR_INVALID_PARAMETER;
+
+ /*
+ * Handle access mode.
+ */
+ uint64_t fMode = 0;
+ char chPrev = '\0';
+ while ( pszCur
+ && *pszCur != '\0')
+ {
+ bool fSkip = false;
+ switch (*pszCur)
+ {
+ case 'b': /* Binary mode. */
+ /* Just skip as being valid. */
+ fSkip = true;
+ break;
+
+ case 'r': /* Read. */
+ fMode |= RTFILE_O_READ;
+ break;
+
+ case 't': /* Text mode. */
+ /* Just skip as being valid. */
+ fSkip = true;
+ break;
+
+ case 'w': /* Write. */
+ fMode |= RTFILE_O_WRITE;
+ break;
+
+ case 'a': /* Append. */
+ fMode |= RTFILE_O_WRITE | RTFILE_O_APPEND;
+ break;
+
+ case '+':
+ {
+ switch (chPrev)
+ {
+ case 'w':
+ case 'a':
+ /* Also use read access in write mode. */
+ fMode |= RTFILE_O_READ;
+ break;
+
+ case 'r':
+ /* Also use write access in read mode. */
+ fMode |= RTFILE_O_WRITE;
+ break;
+
+ case 'b':
+ case 't':
+ /* Silently eat skipped parameters. */
+ fSkip = true;
+ break;
+
+ case 0: /* No previous character yet. */
+ case '+':
+ /* Eat plusses which don't belong to a command. */
+ fSkip = true;
+ break;
+
+ default:
+ return VERR_INVALID_PARAMETER;
+ }
+
+ break;
+ }
+
+ default:
+ return VERR_INVALID_PARAMETER;
+ }
+
+ if (!fSkip)
+ chPrev = *pszCur;
+ pszCur++;
+ }
+
+ /*
+ * Handle disposition.
+ */
+ pszCur = pszDisposition;
+
+ /* Create a new file, always, overwrite an existing file. */
+ if ( !RTStrCmp(pszCur, "ca")
+ || !RTStrCmp(pszCur, "create-replace"))
+ fMode |= RTFILE_O_CREATE_REPLACE;
+ /* Create a new file if it does not exist, fail if exist. */
+ else if ( !RTStrCmp(pszCur, "ce")
+ || !RTStrCmp(pszCur, "create"))
+ fMode |= RTFILE_O_CREATE;
+ /* Open existing file, create file if does not exist. */
+ else if ( !RTStrCmp(pszCur, "oc")
+ || !RTStrCmp(pszCur, "open-create"))
+ fMode |= RTFILE_O_OPEN_CREATE;
+ /* Open existing file and place the file pointer at the end of the file, if
+ * opened with write access. Create the file if does not exist.
+ * Note! This mode is ill conceived as the appending is a accesss mode not open disposition. */
+ else if ( !RTStrCmp(pszCur, "oa")
+ || !RTStrCmp(pszCur, "open-append"))
+ fMode |= RTFILE_O_OPEN_CREATE | RTFILE_O_APPEND;
+ /* Open existing, fail if does not exist. */
+ else if ( !RTStrCmp(pszCur, "oe")
+ || !RTStrCmp(pszCur, "open"))
+ fMode |= RTFILE_O_OPEN;
+ /* Open and truncate existing, fail of not exist. */
+ else if ( !RTStrCmp(pszCur, "ot")
+ || !RTStrCmp(pszCur, "open-truncate"))
+ fMode |= RTFILE_O_OPEN | RTFILE_O_TRUNCATE;
+ else
+ return VERR_INVALID_PARAMETER;
+
+ /* No action mask set? */
+ if ((fMode & RTFILE_O_ACTION_MASK) == 0)
+ return VERR_INVALID_PARAMETER;
+
+ /*
+ * Sharing mode.
+ */
+ if (!pszSharing || !*pszSharing)
+ fMode |= RTFILE_O_DENY_NONE;
+ else
+ {
+ do
+ {
+ if (pszSharing[0] == 'n')
+ {
+ if (pszSharing[1] == 'r') /* nr (no other readers) */
+ {
+ if (pszSharing[2] == 'w') /* nrw (no other readers or writers) */
+ {
+ fMode |= RTFILE_O_DENY_READWRITE;
+ pszSharing += 3;
+ }
+ else
+ {
+ fMode |= RTFILE_O_DENY_READ;
+ pszSharing += 2;
+ }
+ }
+ else if (pszSharing[1] == 'w') /* nw (no other writers) */
+ {
+ fMode |= RTFILE_O_DENY_WRITE;
+ pszSharing += 2;
+ }
+ else
+ return VERR_INVALID_PARAMETER;
+ }
+ else if (pszSharing[0] == 'd') /* d (don't deny delete) */
+ {
+ fMode |= RTFILE_O_DENY_WRITE;
+ pszSharing++;
+ }
+ else
+ return VERR_INVALID_PARAMETER;
+ } while (*pszSharing != '\0');
+ }
+
+ /* Return. */
+ *pfMode = fMode;
+ return VINF_SUCCESS;
+}
+RT_EXPORT_SYMBOL(RTFileModeToFlagsEx);
+
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