Git conversion: Make reactos the root directory, move rosapps, rostests, wallpapers...

[reactos.git] / subsystems / mvdm / ntvdm / utils.c

diff --git a/subsystems/mvdm/ntvdm/utils.c b/subsystems/mvdm/ntvdm/utils.c
new file mode 100644 (file)
index 0000000..d46a284
--- /dev/null
+++ b/subsystems/mvdm/ntvdm/utils.c
@@ -0,0 +1,88 @@
+/*
+ * COPYRIGHT:       GPL - See COPYING in the top level directory
+ * PROJECT:         ReactOS Virtual DOS Machine
+ * FILE:            subsystems/mvdm/ntvdm/utils.c
+ * PURPOSE:         Utility Functions
+ * PROGRAMMERS:     Hermes Belusca-Maito (hermes.belusca@sfr.fr)
+ */
+
+/* INCLUDES *******************************************************************/
+
+#include "ntvdm.h"
+
+#define NDEBUG
+#include <debug.h>
+
+/* PRIVATE FUNCTIONS **********************************************************/
+
+/* PUBLIC FUNCTIONS ***********************************************************/
+
+VOID
+FileClose(IN HANDLE FileHandle)
+{
+    CloseHandle(FileHandle);
+}
+
+HANDLE
+FileOpen(IN  PCSTR  FileName,
+         OUT PULONG FileSize OPTIONAL)
+{
+    HANDLE hFile;
+    ULONG  ulFileSize;
+
+    /* Open the file */
+    SetLastError(0); // For debugging purposes
+    hFile = CreateFileA(FileName,
+                        GENERIC_READ,
+                        FILE_SHARE_READ,
+                        NULL,
+                        OPEN_EXISTING,
+                        FILE_ATTRIBUTE_NORMAL,
+                        NULL);
+    DPRINT1("File '%s' opening %s ; GetLastError() = %u\n",
+            FileName, hFile != INVALID_HANDLE_VALUE ? "succeeded" : "failed", GetLastError());
+
+    /* If we failed, bail out */
+    if (hFile == INVALID_HANDLE_VALUE) return NULL;
+
+    /* OK, we have a handle to the file */
+
+    /*
+     * Retrieve the size of the file. In NTVDM we will handle files
+     * of maximum 1Mb so we can largely use GetFileSize only.
+     */
+    ulFileSize = GetFileSize(hFile, NULL);
+    if (ulFileSize == INVALID_FILE_SIZE && GetLastError() != ERROR_SUCCESS)
+    {
+        /* We failed, bail out */
+        DPRINT1("Error when retrieving file size, or size too large (%d)\n", ulFileSize);
+        FileClose(hFile);
+        return NULL;
+    }
+
+    /* Success, return file handle and size if needed */
+    if (FileSize) *FileSize = ulFileSize;
+    return hFile;
+}
+
+BOOLEAN
+FileLoadByHandle(IN  HANDLE FileHandle,
+                 IN  PVOID  Location,
+                 IN  ULONG  FileSize,
+                 OUT PULONG BytesRead)
+{
+    BOOLEAN Success;
+
+    /* Attempt to load the file into memory */
+    SetLastError(0); // For debugging purposes
+    Success = !!ReadFile(FileHandle,
+                         Location, // REAL_TO_PHYS(LocationRealPtr),
+                         FileSize,
+                         BytesRead,
+                         NULL);
+    DPRINT1("File loading %s ; GetLastError() = %u\n", Success ? "succeeded" : "failed", GetLastError());
+
+    return Success;
+}
+
+/* EOF */