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 >= Fcb->Entry.DataLengthL)
77 return(STATUS_END_OF_FILE);
79 DPRINT("Reading %d bytes at %d\n", Length, ReadOffset);
81 if (!(IrpFlags & (IRP_NOCACHE|IRP_PAGING_IO)))
83 LARGE_INTEGER FileOffset;
84 IO_STATUS_BLOCK IoStatus;
86 if (ReadOffset + Length > Fcb->Entry.DataLengthL)
87 Length = Fcb->Entry.DataLengthL - ReadOffset;
88 if (FileObject->PrivateCacheMap == NULL)
90 CcRosInitializeFileCache(FileObject, &Fcb->RFCB.Bcb, PAGE_SIZE);
93 FileOffset.QuadPart = (LONGLONG)ReadOffset;
94 CcCopyRead(FileObject,
100 *LengthRead = IoStatus.Information;
102 return(IoStatus.Status);
105 if ((ReadOffset % BLOCKSIZE) != 0 || (Length % BLOCKSIZE) != 0)
107 return STATUS_INVALID_PARAMETER;
109 if (ReadOffset + Length > ROUND_UP(Fcb->Entry.DataLengthL, BLOCKSIZE))
110 Length = ROUND_UP(Fcb->Entry.DataLengthL, BLOCKSIZE) - ReadOffset;
112 Status = CdfsReadSectors(DeviceExt->StorageDevice,
113 Fcb->Entry.ExtentLocationL + (ReadOffset / BLOCKSIZE),
116 if (NT_SUCCESS(Status))
118 *LengthRead = Length;
119 if (Length + ReadOffset > Fcb->Entry.DataLengthL)
121 memset(Buffer + Fcb->Entry.DataLengthL - ReadOffset,
122 0, Length + ReadOffset - Fcb->Entry.DataLengthL);
131 CdfsRead(PDEVICE_OBJECT DeviceObject,
134 PDEVICE_EXTENSION DeviceExt;
135 PIO_STACK_LOCATION Stack;
136 PFILE_OBJECT FileObject;
139 LARGE_INTEGER ReadOffset;
140 ULONG ReturnedReadLength = 0;
141 NTSTATUS Status = STATUS_SUCCESS;
143 DPRINT("CdfsRead(DeviceObject %x, Irp %x)\n",DeviceObject,Irp);
145 DeviceExt = DeviceObject->DeviceExtension;
146 Stack = IoGetCurrentIrpStackLocation(Irp);
147 FileObject = Stack->FileObject;
149 ReadLength = Stack->Parameters.Read.Length;
150 ReadOffset = Stack->Parameters.Read.ByteOffset;
151 Buffer = MmGetSystemAddressForMdl(Irp->MdlAddress);
153 Status = CdfsReadFile(DeviceExt,
157 ReadOffset.u.LowPart,
159 &ReturnedReadLength);
162 if (NT_SUCCESS(Status))
164 if (FileObject->Flags & FO_SYNCHRONOUS_IO)
166 FileObject->CurrentByteOffset.QuadPart =
167 ReadOffset.QuadPart + ReturnedReadLength;
169 Irp->IoStatus.Information = ReturnedReadLength;
173 Irp->IoStatus.Information = 0;
176 Irp->IoStatus.Status = Status;
177 IoCompleteRequest(Irp,IO_NO_INCREMENT);
184 CdfsWrite(PDEVICE_OBJECT DeviceObject,
187 DPRINT("CdfsWrite(DeviceObject %x Irp %x)\n",DeviceObject,Irp);
189 Irp->IoStatus.Status = STATUS_NOT_SUPPORTED;
190 Irp->IoStatus.Information = 0;
191 return(STATUS_NOT_SUPPORTED);