From 093e6f6d3c0519815c0141c7e2f37328b5687100 Mon Sep 17 00:00:00 2001
From: Aleksey Bragin <aleksey@reactos.org>
Date: Fri, 23 Jan 2009 09:41:30 +0000
Subject: [PATCH] Alex Vlasov - Implement FatRead as a wrapper around internal
 helper FatiRead. - Stubplement FatiRead.

svn path=/trunk/; revision=39029
---
 reactos/drivers/filesystems/fastfat_new/rw.c | 59 +++++++++++++++++++-
 1 file changed, 58 insertions(+), 1 deletion(-)

diff --git a/reactos/drivers/filesystems/fastfat_new/rw.c b/reactos/drivers/filesystems/fastfat_new/rw.c
index 948d780a226..a2223fb7498 100644
--- a/reactos/drivers/filesystems/fastfat_new/rw.c
+++ b/reactos/drivers/filesystems/fastfat_new/rw.c
@@ -4,6 +4,7 @@
  * FILE:            drivers/filesystems/fastfat/rw.c
  * PURPOSE:         Read/write support
  * PROGRAMMERS:     Aleksey Bragin (aleksey@reactos.org)
+ *                  Alexey Vlasov
  */
 
 /* INCLUDES *****************************************************************/
@@ -13,12 +14,68 @@
 
 /* FUNCTIONS *****************************************************************/
 
+NTSTATUS
+NTAPI
+FatiRead(PFAT_IRP_CONTEXT IrpContext)
+{
+    CSHORT FcbType;
+    ULONG NumberOfBytes;
+
+    FcbType = *((PCSHORT) IrpContext->FileObject->FsContext);
+    NumberOfBytes = IrpContext->Stack->Parameters.Read.Length;
+    if (NumberOfBytes == 0)
+    {
+        FatCompleteRequest(IrpContext, IrpContext->Irp, STATUS_SUCCESS);
+        return STATUS_SUCCESS;
+    }
+    //if (FcbType == FAT_NTC_VCB)
+
+    DPRINT1("FatiRead()\n");
+    return STATUS_NOT_IMPLEMENTED;
+}
+
 NTSTATUS
 NTAPI
 FatRead(PDEVICE_OBJECT DeviceObject, PIRP Irp)
 {
+    NTSTATUS Status;
+    BOOLEAN TopLevel, CanWait;
+    PFAT_IRP_CONTEXT IrpContext;
+
+    CanWait = TRUE;
+    TopLevel = FALSE;
+    Status = STATUS_INVALID_DEVICE_REQUEST;
+    /* Get CanWait flag */
+    if (IoGetCurrentIrpStackLocation(Irp)->FileObject != NULL)
+        CanWait = IoIsOperationSynchronous(Irp);
+
+    /* Enter FsRtl critical region */
+    FsRtlEnterFileSystem();
+
+    if (DeviceObject != FatGlobalData.DiskDeviceObject)
+    {
+        /* Set Top Level IRP if not set */
+        if (IoGetTopLevelIrp() == NULL)
+        {
+            IoSetTopLevelIrp(Irp);
+            TopLevel = TRUE;
+        }
+
+        /* Build an irp context */
+        IrpContext = FatBuildIrpContext(Irp, CanWait);
+
+        /* Perform the actual read */
+        Status = FatiRead(IrpContext);
+
+        /* Restore top level Irp */
+        if (TopLevel)
+            IoSetTopLevelIrp(NULL);
+    }
+    /* Leave FsRtl critical region */
+    FsRtlExitFileSystem();
+
     DPRINT1("FatRead()\n");
-    return STATUS_NOT_IMPLEMENTED;
+    return Status;
 }
 
 NTSTATUS