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reactos/drivers/filesystems/cdfs/misc.c

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/*
* ReactOS kernel
* Copyright (C) 2002, 2004 ReactOS Team
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
* FILE: drivers/filesystems/cdfs/misc.c
* PURPOSE: CDROM (ISO 9660) filesystem driver
* PROGRAMMER: Eric Kohl
* UPDATE HISTORY:
*/
/* INCLUDES *****************************************************************/
#include "cdfs.h"
#define NDEBUG
#include <debug.h>
/* FUNCTIONS ****************************************************************/
/*
* FUNCTION: Used with IRP to set them to TopLevelIrp field
* ARGUMENTS:
* Irp = The IRP to set
* RETURNS: TRUE if top level was null, else FALSE
*/
BOOLEAN
CdfsIsIrpTopLevel(
PIRP Irp)
{
BOOLEAN ReturnCode = FALSE;
DPRINT("CdfsIsIrpTopLevel()\n");
if (IoGetTopLevelIrp() == NULL)
{
IoSetTopLevelIrp(Irp);
ReturnCode = TRUE;
}
return ReturnCode;
}
/*
* FUNCTION: Allocate and fill a CDFS_IRP_CONTEXT struct in order to use it for IRP
* ARGUMENTS:
* DeviceObject = Used to fill in struct
* Irp = The IRP that need IRP_CONTEXT struct
* RETURNS: NULL or PCDFS_IRP_CONTEXT
*/
PCDFS_IRP_CONTEXT
CdfsAllocateIrpContext(
PDEVICE_OBJECT DeviceObject,
PIRP Irp)
{
PCDFS_IRP_CONTEXT IrpContext;
DPRINT("CdfsAllocateIrpContext()\n");
IrpContext = (PCDFS_IRP_CONTEXT)ExAllocateFromNPagedLookasideList(&CdfsGlobalData->IrpContextLookasideList);
if (IrpContext == NULL)
return NULL;
RtlZeroMemory(IrpContext, sizeof(CDFS_IRP_CONTEXT));
// IrpContext->Identifier.Type = NTFS_TYPE_IRP_CONTEST;
// IrpContext->Identifier.Size = sizeof(NTFS_IRP_CONTEXT);
IrpContext->Irp = Irp;
IrpContext->DeviceObject = DeviceObject;
IrpContext->Stack = IoGetCurrentIrpStackLocation(Irp);
IrpContext->MajorFunction = IrpContext->Stack->MajorFunction;
IrpContext->MinorFunction = IrpContext->Stack->MinorFunction;
IrpContext->FileObject = IrpContext->Stack->FileObject;
IrpContext->IsTopLevel = (IoGetTopLevelIrp() == Irp);
IrpContext->PriorityBoost = IO_NO_INCREMENT;
IrpContext->Flags = IRPCONTEXT_COMPLETE;
if (IrpContext->MajorFunction == IRP_MJ_FILE_SYSTEM_CONTROL ||
IrpContext->MajorFunction == IRP_MJ_DEVICE_CONTROL ||
IrpContext->MajorFunction == IRP_MJ_SHUTDOWN ||
(IrpContext->MajorFunction != IRP_MJ_CLEANUP &&
IrpContext->MajorFunction != IRP_MJ_CLOSE &&
IoIsOperationSynchronous(Irp)))
{
IrpContext->Flags |= IRPCONTEXT_CANWAIT;
}
return IrpContext;
}
VOID
CdfsSwapString(PWCHAR Out,
PUCHAR In,
ULONG Count)
{
PUCHAR t = (PUCHAR)Out;
ULONG i;
for (i = 0; i < Count; i += 2)
{
t[i] = In[i+1];
t[i+1] = In[i];
if (t[i+1] == 0 && t[i] == ';')
break;
}
if ((i>2)&&(t[i-2] == '.'))
{
t[i-2] = 0;
t[i-1] = 0;
}
t[i] = 0;
t[i+1] = 0;
}
VOID
CdfsDateTimeToSystemTime(PFCB Fcb,
PLARGE_INTEGER SystemTime)
{
TIME_FIELDS TimeFields;
LARGE_INTEGER LocalTime;
TimeFields.Milliseconds = 0;
TimeFields.Second = Fcb->Entry.Second;
TimeFields.Minute = Fcb->Entry.Minute;
TimeFields.Hour = Fcb->Entry.Hour;
TimeFields.Day = Fcb->Entry.Day;
TimeFields.Month = Fcb->Entry.Month;
TimeFields.Year = Fcb->Entry.Year + 1900;
RtlTimeFieldsToTime(&TimeFields,
&LocalTime);
ExLocalTimeToSystemTime(&LocalTime, SystemTime);
}
VOID
CdfsFileFlagsToAttributes(PFCB Fcb,
PULONG FileAttributes)
{
/* FIXME: Fix attributes */
*FileAttributes = // FILE_ATTRIBUTE_READONLY |
((Fcb->Entry.FileFlags & FILE_FLAG_HIDDEN) ? FILE_ATTRIBUTE_HIDDEN : 0) |
((Fcb->Entry.FileFlags & FILE_FLAG_DIRECTORY) ? FILE_ATTRIBUTE_DIRECTORY : 0) |
((Fcb->Entry.FileFlags & FILE_FLAG_SYSTEM) ? FILE_ATTRIBUTE_SYSTEM : 0) |
((Fcb->Entry.FileFlags & FILE_FLAG_READONLY) ? FILE_ATTRIBUTE_READONLY : 0);
}
BOOLEAN
CdfsIsNameLegalDOS8Dot3(IN UNICODE_STRING FileName
)
{
ULONG i;
STRING DbcsName;
CHAR DbcsNameBuffer[12];
/* 8dot3 filename is max 12 length */
if (FileName.Length / sizeof(WCHAR) > 12)
{
return FALSE;
}
ASSERT(FileName.Length >= sizeof(WCHAR));
for (i = 0; i < FileName.Length / sizeof(WCHAR) ; i++)
{
/* Don't allow spaces in FileName */
if (FileName.Buffer[i] == L' ')
return FALSE;
}
/* If FileName is finishing with a dot, remove it */
if (FileName.Buffer[FileName.Length / sizeof(WCHAR) - 1] == '.')
{
FileName.Length -= sizeof(WCHAR);
}
/* Finally, convert the string to call the FsRtl function */
RtlInitEmptyAnsiString(&DbcsName, DbcsNameBuffer, sizeof(DbcsNameBuffer));
if (!NT_SUCCESS(RtlUnicodeStringToCountedOemString(&DbcsName,
&FileName,
FALSE)))
{
return FALSE;
}
return FsRtlIsFatDbcsLegal(DbcsName, FALSE, FALSE, FALSE);
}
BOOLEAN
CdfsIsRecordValid(IN PDEVICE_EXTENSION DeviceExt,
IN PDIR_RECORD Record)
{
if (Record->RecordLength < Record->FileIdLength + FIELD_OFFSET(DIR_RECORD, FileId))
{
DPRINT1("Found corrupted entry! %u - %u\n", Record->RecordLength, Record->FileIdLength + FIELD_OFFSET(DIR_RECORD, FileId));
return FALSE;
}
if (Record->FileIdLength == 0)
{
DPRINT1("Found corrupted entry (null size)!\n");
return FALSE;
}
if (DeviceExt->CdInfo.JolietLevel == 0)
{
if (Record->FileId[0] == ANSI_NULL && Record->FileIdLength != 1)
{
DPRINT1("Found corrupted entry!\n");
return FALSE;
}
}
else
{
if (Record->FileIdLength & 1 && Record->FileIdLength != 1)
{
DPRINT1("Found corrupted entry! %u\n", Record->FileIdLength);
return FALSE;
}
if (Record->FileIdLength == 1 && Record->FileId[0] != 0 && Record->FileId[0] != 1)
{
DPRINT1("Found corrupted entry! %c\n", Record->FileId[0]);
DPRINT1("%wc\n", ((PWSTR)Record->FileId)[0]);
return FALSE;
}
}
return TRUE;
}
VOID
CdfsShortNameCacheGet
(PFCB DirectoryFcb,
PLARGE_INTEGER StreamOffset,
PUNICODE_STRING LongName,
PUNICODE_STRING ShortName)
{
PLIST_ENTRY Entry;
PCDFS_SHORT_NAME ShortNameEntry;
GENERATE_NAME_CONTEXT Context = { 0 };
DPRINT("CdfsShortNameCacheGet(%I64d,%wZ)\n", StreamOffset->QuadPart, LongName);
/* Get the name list resource */
ExAcquireResourceExclusiveLite(&DirectoryFcb->NameListResource, TRUE);
/* Try to find the name in our cache */
for (Entry = DirectoryFcb->ShortNameList.Flink;
Entry != &DirectoryFcb->ShortNameList;
Entry = Entry->Flink)
{
ShortNameEntry = CONTAINING_RECORD(Entry, CDFS_SHORT_NAME, Entry);
if (ShortNameEntry->StreamOffset.QuadPart == StreamOffset->QuadPart)
{
/* Cache hit */
RtlCopyUnicodeString(ShortName, &ShortNameEntry->Name);
ExReleaseResourceLite(&DirectoryFcb->NameListResource);
DPRINT("Yield short name %wZ from cache\n", ShortName);
return;
}
}
/* Cache miss */
if (!CdfsIsNameLegalDOS8Dot3(*LongName))
{
RtlGenerate8dot3Name(LongName, FALSE, &Context, ShortName);
}
else
{
/* copy short name */
RtlUpcaseUnicodeString
(ShortName,
LongName,
FALSE);
}
DPRINT("Initial Guess %wZ\n", ShortName);
/* Make it unique by scanning the cache and bumping */
/* Note that incrementing the ambiguous name is enough, since we add new
* entries at the tail. We'll scan over all collisions. */
/* XXX could perform better. */
for (Entry = DirectoryFcb->ShortNameList.Flink;
Entry != &DirectoryFcb->ShortNameList;
Entry = Entry->Flink)
{
ShortNameEntry = CONTAINING_RECORD(Entry, CDFS_SHORT_NAME, Entry);
if (RtlCompareUnicodeString
(ShortName,
&ShortNameEntry->Name,
TRUE) == 0) /* Match */
{
RtlGenerate8dot3Name(LongName, FALSE, &Context, ShortName);
DPRINT("Collide; try %wZ\n", ShortName);
}
}
/* We've scanned over all entries and now have a unique one. Cache it. */
ShortNameEntry = ExAllocatePoolWithTag(PagedPool,
sizeof(CDFS_SHORT_NAME),
CDFS_SHORT_NAME_TAG);
if (!ShortNameEntry)
{
/* We couldn't cache it, but we can return it. We run the risk of
* generating a non-unique name later. */
ExReleaseResourceLite(&DirectoryFcb->NameListResource);
DPRINT1("Couldn't cache potentially clashing 8.3 name %wZ\n", ShortName);
return;
}
ShortNameEntry->StreamOffset = *StreamOffset;
RtlInitEmptyUnicodeString(&ShortNameEntry->Name,
ShortNameEntry->NameBuffer,
sizeof(ShortNameEntry->NameBuffer));
RtlCopyUnicodeString(&ShortNameEntry->Name, ShortName);
InsertTailList(&DirectoryFcb->ShortNameList, &ShortNameEntry->Entry);
ExReleaseResourceLite(&DirectoryFcb->NameListResource);
DPRINT("Returning short name %wZ for long name %wZ\n", ShortName, LongName);
}
VOID
CdfsGetDirEntryName(PDEVICE_EXTENSION DeviceExt,
PDIR_RECORD Record,
PWSTR Name)
/*
* FUNCTION: Retrieves the file name from a directory record.
*/
{
if (Record->FileIdLength == 1 && Record->FileId[0] == 0)
{
wcscpy(Name, L".");
}
else if (Record->FileIdLength == 1 && Record->FileId[0] == 1)
{
wcscpy(Name, L"..");
}
else
{
if (DeviceExt->CdInfo.JolietLevel == 0)
{
ULONG i;
for (i = 0; i < Record->FileIdLength && Record->FileId[i] != ';'; i++)
Name[i] = (WCHAR)Record->FileId[i];
Name[i] = 0;
}
else
{
CdfsSwapString(Name,
Record->FileId,
Record->FileIdLength);
}
}
DPRINT("Name '%S'\n", Name);
}
/* EOF */
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