1 files changed, 127 insertions, 0 deletions
diff --git a/src/VBox/Runtime/generic/RTFileReadAllByHandleEx-generic.cpp b/src/VBox/Runtime/generic/RTFileReadAllByHandleEx-generic.cpp
new file mode 100644
index 00000000..7202ab75
--- /dev/null
+++ b/src/VBox/Runtime/generic/RTFileReadAllByHandleEx-generic.cpp
@@ -0,0 +1,127 @@
+/* $Id: RTFileReadAllByHandleEx-generic.cpp $ */
+/** @file
+ * IPRT - RTFileReadAllByHandleEx, generic implementation.
+ */
+
+/*
+ * Copyright (C) 2008-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox 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.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <iprt/file.h>
+#include "internal/iprt.h"
+
+#include <iprt/mem.h>
+#include <iprt/assert.h>
+#include <iprt/string.h>
+#include <iprt/errcore.h>
+
+
+RTDECL(int) RTFileReadAllByHandleEx(RTFILE File, RTFOFF off, RTFOFF cbMax, uint32_t fFlags, void **ppvFile, size_t *pcbFile)
+{
+    AssertReturn(!(fFlags & ~RTFILE_RDALL_VALID_MASK), VERR_INVALID_PARAMETER);
+
+    /*
+     * Save the current offset first.
+     */
+    RTFOFF offOrg;
+    int rc = RTFileSeek(File, 0, RTFILE_SEEK_CURRENT, (uint64_t *)&offOrg);
+    if (RT_SUCCESS(rc))
+    {
+        /*
+         * Get the file size, adjust it and check that it might fit into memory.
+         */
+        RTFOFF cbFile;
+        AssertCompile(sizeof(cbFile) == sizeof(uint64_t));
+        rc = RTFileSeek(File, 0, RTFILE_SEEK_END, (uint64_t *)&cbFile);
+        if (RT_SUCCESS(rc))
+        {
+            RTFOFF cbAllocFile = cbFile > off ? cbFile - off : 0;
+            if (cbAllocFile <= cbMax)
+            { /* likely */ }
+            else if (!(fFlags & RTFILE_RDALL_F_FAIL_ON_MAX_SIZE))
+                cbAllocFile = cbMax;
+            else
+                rc = VERR_OUT_OF_RANGE;
+            if (RT_SUCCESS(rc))
+            {
+                size_t cbAllocMem = (size_t)cbAllocFile;
+                if ((RTFOFF)cbAllocMem == cbAllocFile)
+                {
+                    /*
+                     * Try allocate the required memory and initialize the header (hardcoded fun).
+                     */
+                    void *pvHdr = RTMemAlloc(cbAllocMem + 32 + (fFlags & RTFILE_RDALL_F_TRAILING_ZERO_BYTE ? 1 : 0));
+                    if (pvHdr)
+                    {
+                        memset(pvHdr, 0xff, 32);
+                        *(size_t *)pvHdr = cbAllocMem;
+
+                        /*
+                         * Seek and read.
+                         */
+                        rc = RTFileSeek(File, off, RTFILE_SEEK_BEGIN, NULL);
+                        if (RT_SUCCESS(rc))
+                        {
+                            void *pvFile = (uint8_t *)pvHdr + 32;
+                            rc = RTFileRead(File, pvFile, cbAllocMem, NULL);
+                            if (RT_SUCCESS(rc))
+                            {
+                                if (fFlags & RTFILE_RDALL_F_TRAILING_ZERO_BYTE)
+                                    ((uint8_t *)pvFile)[cbAllocFile] = '\0';
+
+                                /*
+                                 * Success - fill in the return values.
+                                 */
+                                *ppvFile = pvFile;
+                                *pcbFile = cbAllocMem;
+                            }
+                        }
+
+                        if (RT_FAILURE(rc))
+                            RTMemFree(pvHdr);
+                    }
+                    else
+                        rc = VERR_NO_MEMORY;
+                }
+                else
+                    rc = VERR_TOO_MUCH_DATA;
+            }
+        }
+        /* restore the position. */
+        RTFileSeek(File, offOrg, RTFILE_SEEK_BEGIN, NULL);
+    }
+    return rc;
+}
+RT_EXPORT_SYMBOL(RTFileReadAllByHandleEx);
+