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![Amine Khaldi](/assets/img/avatar_default.png)
* Create a branch for some evul shell experiments. svn path=/branches/shell-experiments/; revision=61927
233 lines
7 KiB
C
233 lines
7 KiB
C
/*
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* ReactOS kernel
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* Copyright (C) 2002, 2004 ReactOS Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS kernel
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* FILE: services/fs/cdfs/misc.c
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* PURPOSE: CDROM (ISO 9660) filesystem driver
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* PROGRAMMER: Eric Kohl
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* UPDATE HISTORY:
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*/
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/* INCLUDES *****************************************************************/
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#include "cdfs.h"
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#define NDEBUG
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#include <debug.h>
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/* FUNCTIONS ****************************************************************/
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VOID
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CdfsSwapString(PWCHAR Out,
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PUCHAR In,
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ULONG Count)
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{
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PUCHAR t = (PUCHAR)Out;
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ULONG i;
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for (i = 0; i < Count; i += 2)
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{
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t[i] = In[i+1];
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t[i+1] = In[i];
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if (t[i+1] == 0 && t[i] == ';')
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break;
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}
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if ((i>2)&&(t[i-2] == '.'))
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{
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t[i-2] = 0;
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t[i-1] = 0;
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}
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t[i] = 0;
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t[i+1] = 0;
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}
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VOID
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CdfsDateTimeToSystemTime(PFCB Fcb,
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PLARGE_INTEGER SystemTime)
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{
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TIME_FIELDS TimeFields;
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LARGE_INTEGER LocalTime;
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TimeFields.Milliseconds = 0;
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TimeFields.Second = Fcb->Entry.Second;
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TimeFields.Minute = Fcb->Entry.Minute;
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TimeFields.Hour = Fcb->Entry.Hour;
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TimeFields.Day = Fcb->Entry.Day;
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TimeFields.Month = Fcb->Entry.Month;
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TimeFields.Year = Fcb->Entry.Year + 1900;
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RtlTimeFieldsToTime(&TimeFields,
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&LocalTime);
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ExLocalTimeToSystemTime(&LocalTime, SystemTime);
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}
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VOID
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CdfsFileFlagsToAttributes(PFCB Fcb,
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PULONG FileAttributes)
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{
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/* FIXME: Fix attributes */
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*FileAttributes = // FILE_ATTRIBUTE_READONLY |
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((Fcb->Entry.FileFlags & FILE_FLAG_HIDDEN) ? FILE_ATTRIBUTE_HIDDEN : 0) |
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((Fcb->Entry.FileFlags & FILE_FLAG_DIRECTORY) ? FILE_ATTRIBUTE_DIRECTORY : 0) |
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((Fcb->Entry.FileFlags & FILE_FLAG_SYSTEM) ? FILE_ATTRIBUTE_SYSTEM : 0) |
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((Fcb->Entry.FileFlags & FILE_FLAG_READONLY) ? FILE_ATTRIBUTE_READONLY : 0);
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}
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BOOLEAN
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CdfsIsNameLegalDOS8Dot3(IN UNICODE_STRING FileName
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)
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{
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ULONG i;
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STRING DbcsName;
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CHAR DbcsNameBuffer[12];
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/* 8dot3 filename is max 12 length */
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if (FileName.Length / sizeof(WCHAR) > 12)
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{
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return FALSE;
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}
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for (i = 0; i < FileName.Length / sizeof(WCHAR) ; i++)
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{
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/* Don't allow spaces in FileName */
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if (FileName.Buffer[i] == L' ')
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return FALSE;
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}
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/* If FileName is finishing with a dot, remove it */
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if (FileName.Buffer[FileName.Length / sizeof(WCHAR) - 1] == '.')
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{
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FileName.Length -= sizeof(WCHAR);
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}
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/* Finally, convert the string to call the FsRtl function */
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DbcsName.MaximumLength = 12;
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DbcsName.Buffer = DbcsNameBuffer;
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if (!NT_SUCCESS(RtlUnicodeStringToCountedOemString(&DbcsName,
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&FileName,
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FALSE )))
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{
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return FALSE;
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}
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return FsRtlIsFatDbcsLegal(DbcsName, FALSE, FALSE, FALSE);
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}
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VOID
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CdfsShortNameCacheGet
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(PFCB DirectoryFcb,
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PLARGE_INTEGER StreamOffset,
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PUNICODE_STRING LongName,
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PUNICODE_STRING ShortName)
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{
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PLIST_ENTRY Entry;
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PCDFS_SHORT_NAME ShortNameEntry;
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GENERATE_NAME_CONTEXT Context = { 0 };
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DPRINT("CdfsShortNameCacheGet(%I64d,%wZ)\n", StreamOffset->QuadPart, LongName);
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/* Get the name list resource */
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ExAcquireResourceExclusiveLite(&DirectoryFcb->NameListResource, TRUE);
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/* Try to find the name in our cache */
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for (Entry = DirectoryFcb->ShortNameList.Flink;
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Entry != &DirectoryFcb->ShortNameList;
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Entry = Entry->Flink)
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{
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ShortNameEntry = CONTAINING_RECORD(Entry, CDFS_SHORT_NAME, Entry);
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if (ShortNameEntry->StreamOffset.QuadPart == StreamOffset->QuadPart)
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{
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/* Cache hit */
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RtlCopyMemory
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(ShortName->Buffer, ShortNameEntry->Name.Buffer,
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ShortNameEntry->Name.Length);
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ShortName->Length = ShortNameEntry->Name.Length;
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ExReleaseResourceLite(&DirectoryFcb->NameListResource);
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DPRINT("Yield short name %wZ from cache\n", ShortName);
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return;
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}
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}
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/* Cache miss */
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if (!CdfsIsNameLegalDOS8Dot3(*LongName))
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{
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RtlGenerate8dot3Name(LongName, FALSE, &Context, ShortName);
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}
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else
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{
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/* copy short name */
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RtlUpcaseUnicodeString
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(ShortName,
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LongName,
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FALSE);
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}
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DPRINT("Initial Guess %wZ\n", ShortName);
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/* Make it unique by scanning the cache and bumping */
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/* Note that incrementing the ambiguous name is enough, since we add new
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* entries at the tail. We'll scan over all collisions. */
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/* XXX could perform better. */
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for (Entry = DirectoryFcb->ShortNameList.Flink;
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Entry != &DirectoryFcb->ShortNameList;
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Entry = Entry->Flink)
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{
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ShortNameEntry = CONTAINING_RECORD(Entry, CDFS_SHORT_NAME, Entry);
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if (RtlCompareUnicodeString
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(ShortName,
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&ShortNameEntry->Name,
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TRUE) == 0) /* Match */
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{
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RtlGenerate8dot3Name(LongName, FALSE, &Context, ShortName);
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DPRINT("Collide; try %wZ\n", ShortName);
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}
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}
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/* We've scanned over all entries and now have a unique one. Cache it. */
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ShortNameEntry = ExAllocatePoolWithTag(PagedPool, sizeof(CDFS_SHORT_NAME), TAG_FCB);
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if (!ShortNameEntry)
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{
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/* We couldn't cache it, but we can return it. We run the risk of
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* generating a non-unique name later. */
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ExReleaseResourceLite(&DirectoryFcb->NameListResource);
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DPRINT1("Couldn't cache potentially clashing 8.3 name %wZ\n", ShortName);
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return;
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}
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ShortNameEntry->StreamOffset = *StreamOffset;
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ShortNameEntry->Name.Buffer = ShortNameEntry->NameBuffer;
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ShortNameEntry->Name.Length = ShortName->Length;
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ShortNameEntry->Name.MaximumLength = sizeof(ShortNameEntry->NameBuffer);
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RtlCopyMemory
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(ShortNameEntry->NameBuffer,
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ShortName->Buffer,
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ShortName->Length);
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InsertTailList(&DirectoryFcb->ShortNameList, &ShortNameEntry->Entry);
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ExReleaseResourceLite(&DirectoryFcb->NameListResource);
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DPRINT("Returning short name %wZ for long name %wZ\n", ShortName, LongName);
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}
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/* EOF */
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