3 * Copyright (C) 2002 ReactOS Team
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 * COPYRIGHT: See COPYING in the top level directory
22 * PROJECT: ReactOS kernel
23 * FILE: services/fs/cdfs/rw.c
24 * PURPOSE: CDROM (ISO 9660) filesystem driver
25 * PROGRAMMER: Art Yerkes
29 /* INCLUDES *****************************************************************/
31 #include <ddk/ntddk.h>
32 #include <ntos/minmax.h>
40 /* GLOBALS *******************************************************************/
42 #define ROUND_UP(N, S) ((((N) + (S) - 1) / (S)) * (S))
43 #define ROUND_DOWN(N, S) ((N) - ((N) % (S)))
46 /* FUNCTIONS ****************************************************************/
49 CdfsReadFile(PDEVICE_EXTENSION DeviceExt,
50 PFILE_OBJECT FileObject,
57 * FUNCTION: Reads data from a file
60 NTSTATUS Status = STATUS_SUCCESS;
66 DPRINT("CdfsReadFile(ReadOffset %lu Length %lu)\n", ReadOffset, Length);
71 return STATUS_SUCCESS;
73 Ccb = (PCCB)FileObject->FsContext2;
76 if (ReadOffset + Length > Fcb->Entry.DataLengthL)
77 Length = Fcb->Entry.DataLengthL - ReadOffset;
79 DPRINT("Reading %d bytes at %d\n", Length, ReadOffset);
82 return(STATUS_UNSUCCESSFUL);
84 if (!(IrpFlags & (IRP_NOCACHE|IRP_PAGING_IO)))
86 LARGE_INTEGER FileOffset;
87 IO_STATUS_BLOCK IoStatus;
89 if (FileObject->PrivateCacheMap == NULL)
91 CcRosInitializeFileCache(FileObject, &Fcb->RFCB.Bcb, PAGE_SIZE);
94 FileOffset.QuadPart = (LONGLONG)ReadOffset;
95 CcCopyRead(FileObject,
101 *LengthRead = IoStatus.Information;
103 return(IoStatus.Status);
106 if ((ReadOffset % BLOCKSIZE) != 0)
108 TempLength = min(Length, BLOCKSIZE - (ReadOffset % BLOCKSIZE));
109 TempBuffer = ExAllocatePool(NonPagedPool, BLOCKSIZE);
111 Status = CdfsReadSectors(DeviceExt->StorageDevice,
112 Fcb->Entry.ExtentLocationL + (ReadOffset / BLOCKSIZE),
115 if (NT_SUCCESS(Status))
117 memcpy(Buffer, TempBuffer + (ReadOffset % BLOCKSIZE), TempLength);
118 (*LengthRead) = (*LengthRead) + TempLength;
119 Length = Length - TempLength;
120 Buffer = Buffer + TempLength;
121 ReadOffset = ReadOffset + TempLength;
123 ExFreePool(TempBuffer);
126 DPRINT("Status %lx\n", Status);
128 if ((Length / BLOCKSIZE) != 0 && NT_SUCCESS(Status))
130 TempLength = ROUND_DOWN(Length, BLOCKSIZE);
131 Status = CdfsReadSectors(DeviceExt->StorageDevice,
132 Fcb->Entry.ExtentLocationL + (ReadOffset / BLOCKSIZE),
133 TempLength / BLOCKSIZE,
135 if (NT_SUCCESS(Status))
137 (*LengthRead) = (*LengthRead) + TempLength;
138 Length = Length - TempLength;
139 Buffer = Buffer + TempLength;
140 ReadOffset = ReadOffset + TempLength;
144 DPRINT("Status %lx\n", Status);
146 if (Length > 0 && NT_SUCCESS(Status))
148 TempBuffer = ExAllocatePool(NonPagedPool, BLOCKSIZE);
150 Status = CdfsReadSectors(DeviceExt->StorageDevice,
151 Fcb->Entry.ExtentLocationL + (ReadOffset / BLOCKSIZE),
154 if (NT_SUCCESS(Status))
156 memcpy(Buffer, TempBuffer, Length);
157 (*LengthRead) = (*LengthRead) + Length;
159 ExFreePool(TempBuffer);
167 CdfsRead(PDEVICE_OBJECT DeviceObject,
170 PDEVICE_EXTENSION DeviceExt;
171 PIO_STACK_LOCATION Stack;
172 PFILE_OBJECT FileObject;
175 LARGE_INTEGER ReadOffset;
176 ULONG ReturnedReadLength = 0;
177 NTSTATUS Status = STATUS_SUCCESS;
179 DPRINT("CdfsRead(DeviceObject %x, Irp %x)\n",DeviceObject,Irp);
181 DeviceExt = DeviceObject->DeviceExtension;
182 Stack = IoGetCurrentIrpStackLocation(Irp);
183 FileObject = Stack->FileObject;
185 ReadLength = Stack->Parameters.Read.Length;
186 ReadOffset = Stack->Parameters.Read.ByteOffset;
187 Buffer = MmGetSystemAddressForMdl(Irp->MdlAddress);
189 Status = CdfsReadFile(DeviceExt,
193 ReadOffset.u.LowPart,
195 &ReturnedReadLength);
198 if (NT_SUCCESS(Status))
200 if (FileObject->Flags & FO_SYNCHRONOUS_IO)
202 FileObject->CurrentByteOffset.QuadPart =
203 ReadOffset.QuadPart + ReturnedReadLength;
205 Irp->IoStatus.Information = ReturnedReadLength;
209 Irp->IoStatus.Information = 0;
212 Irp->IoStatus.Status = Status;
213 IoCompleteRequest(Irp,IO_NO_INCREMENT);
220 CdfsWrite(PDEVICE_OBJECT DeviceObject,
223 DPRINT("CdfsWrite(DeviceObject %x Irp %x)\n",DeviceObject,Irp);
225 Irp->IoStatus.Status = STATUS_NOT_SUPPORTED;
226 Irp->IoStatus.Information = 0;
227 return(STATUS_NOT_SUPPORTED);