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write operations on directories
svn path=/trunk/; revision=162
This commit is contained in:
jean
parent
93b8081eed
commit
3c80407d9b
283
reactos/drivers/fs/vfat/dirwr.c
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283
reactos/drivers/fs/vfat/dirwr.c
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@ -0,0 +1,283 @@
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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/vfat/dirwr.c
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* PURPOSE: VFAT Filesystem : write in directory
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*/
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/* INCLUDES *****************************************************************/
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#include <ddk/ntddk.h>
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#include <internal/string.h>
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#include <internal/ctype.h>
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#include <wstring.h>
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#include <ddk/cctypes.h>
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//#define NDEBUG
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#include <internal/debug.h>
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#include "vfat.h"
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NTSTATUS updEntry(PDEVICE_EXTENSION DeviceExt,PFILE_OBJECT pFileObject)
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/*
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update an existing FAT entry
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*/
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{
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WCHAR DirName[MAX_PATH],*FileName,*PathFileName;
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VfatFCB FileFcb;
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ULONG Sector=0,Entry=0;
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PUCHAR Buffer;
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FATDirEntry * pEntries;
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NTSTATUS status;
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FILE_OBJECT FileObject;
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PVfatFCB pDirFcb,pFcb;
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short i,posCar,NameLen;
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PathFileName=pFileObject->FileName.Buffer;
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pFcb=((PVfatCCB)pFileObject->FsContext2)->pFcb;
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//find last \ in PathFileName
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posCar=-1;
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for(i=0;PathFileName[i];i++)
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if(PathFileName[i]=='\\')posCar=i;
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if(posCar==-1)
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return STATUS_UNSUCCESSFUL;
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FileName=&PathFileName[posCar+1];
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for(NameLen=0;FileName[NameLen];NameLen++);
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// extract directory name from pathname
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memcpy(DirName,FileName,posCar*sizeof(WCHAR));
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DirName[posCar]=0;
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if(FileName[0]==0 && DirName[0]==0)
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return STATUS_SUCCESS;//root : nothing to do ?
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status=FsdOpenFile(DeviceExt,&FileObject,DirName);
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pDirFcb=((PVfatCCB)FileObject.FsContext2)->pFcb;
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FileFcb.ObjectName=&FileFcb.PathName[0];
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status=FindFile(DeviceExt,&FileFcb,pDirFcb,FileName,&Sector,&Entry);
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Buffer=ExAllocatePool(NonPagedPool,BLOCKSIZE);
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DPRINT("update entry: sector %d, entry %d\n",Sector,Entry);
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VFATReadSectors(DeviceExt->StorageDevice,Sector,1,Buffer);
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pEntries=(FATDirEntry *)Buffer;
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memcpy(&pEntries[Entry],&pFcb->entry,sizeof(FATDirEntry));
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VFATWriteSectors(DeviceExt->StorageDevice,Sector,1,Buffer);
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ExFreePool(Buffer);
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FsdCloseFile(DeviceExt,&FileObject);
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return STATUS_SUCCESS;
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}
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NTSTATUS addEntry(PDEVICE_EXTENSION DeviceExt
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,PFILE_OBJECT pFileObject,ULONG RequestedOptions)
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/*
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create a new FAT entry
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*/
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{
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WCHAR DirName[MAX_PATH],*FileName,*PathFileName;
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VfatFCB DirFcb,FileFcb;
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FATDirEntry FatEntry;
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NTSTATUS status;
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FILE_OBJECT FileObject;
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FATDirEntry *pEntry;
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slot *pSlots;
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ULONG LengthRead,Offset;
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short nbSlots=0,nbFree=0,i,j,posCar,NameLen;
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PUCHAR Buffer,Buffer2;
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BOOLEAN needTilde;
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PVfatFCB newFCB;
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PVfatCCB newCCB;
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ULONG CurrentCluster;
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PathFileName=pFileObject->FileName.Buffer;
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DPRINT("addEntry: Pathname=%w\n",PathFileName);
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//find last \ in PathFileName
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posCar=-1;
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for(i=0;PathFileName[i];i++)
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if(PathFileName[i]=='\\')posCar=i;
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if(posCar==-1)
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return STATUS_UNSUCCESSFUL;
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FileName=&PathFileName[posCar+1];
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for(NameLen=0;FileName[NameLen];NameLen++);
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// extract directory name from pathname
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memcpy(DirName,PathFileName,posCar*sizeof(WCHAR));
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DirName[posCar]=0;
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DPRINT("open directory %w\n",DirName);
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status=FsdOpenFile(DeviceExt,&FileObject,DirName);
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DPRINT("after open, status=%x\n",status);
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nbSlots=(NameLen+12)/13+1;
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DPRINT("NameLen= %d, nbSlots =%d\n",NameLen,nbSlots);
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Buffer=ExAllocatePool(NonPagedPool,(nbSlots+1)*sizeof(FATDirEntry));
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memset(Buffer,0,(nbSlots+1)*sizeof(FATDirEntry));
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pEntry=(FATDirEntry *)(Buffer+(nbSlots-1)*sizeof(FATDirEntry));
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pSlots=(slot *)Buffer;
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// create 8.3 name
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needTilde=FALSE;
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// find last point in name
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posCar=0;
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for(i=0;FileName[i];i++)
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if(FileName[i]=='.')posCar=i;
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if(!posCar) posCar=i;
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if(posCar>8) needTilde=TRUE;
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//copy 8 characters max
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memset(pEntry,' ',11);
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for(i=0,j=0;j<8 && i<posCar;i++)
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{
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//FIXME : is there other characters to ignore ?
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if( FileName[i]!='.'
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&& FileName[i]!=' '
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&& FileName[i]!='+'
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&& FileName[i]!=','
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&& FileName[i]!=';'
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&& FileName[i]!='='
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&& FileName[i]!='['
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&& FileName[i]!=']'
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)
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pEntry->Filename[j++]=toupper((char) FileName[i]);
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else
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needTilde=TRUE;
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}
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//copy extension
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if(FileName[posCar])
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for(j=0,i=posCar+1;i<posCar+4;i++)
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{
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pEntry->Ext[j++]=toupper((char)( FileName[i] &0x7F));
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}
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//find good value for tilde
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if(needTilde)
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{
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DPRINT("searching a good value for tilde\n");
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for(i=0;i<6;i++)
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DirName[i]=pEntry->Filename[i];
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for(i=0;i<3;i++)
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DirName[i+8]=pEntry->Ext[i];
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//try first with xxxxxx~y.zzz
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DirName[6]='~';
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pEntry->Filename[6]='~';
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DirName[8]='.';
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DirName[12]=0;
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for(i=1;i<9;i++)
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{
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DirName[7]='0'+i;
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pEntry->Filename[7]='0'+i;
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status=FindFile(DeviceExt,&FileFcb
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,&DirFcb,DirName,NULL,NULL);
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if(status!=STATUS_SUCCESS)break;
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}
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//try second with xxxxx~yy.zzz
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if(i==10)
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{
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DirName[5]='~';
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for( ;i<99;i++)
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{
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DirName[7]='0'+i;
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pEntry->Filename[7]='0'+i;
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status=FindFile(DeviceExt,&FileFcb
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,&DirFcb,DirName,NULL,NULL);
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if(status!=STATUS_SUCCESS)break;
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}
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}
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if(i==100)//FIXME : what to do after 99 tilde ?
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{
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FsdCloseFile(DeviceExt,&FileObject);
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ExFreePool(Buffer);
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return STATUS_UNSUCCESSFUL;
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}
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}
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DPRINT("dos name=%11.11s\n",pEntry->Filename);
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//FIXME : set attributes, dates, times
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if(RequestedOptions&FILE_DIRECTORY_FILE)
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pEntry->Attrib |= FILE_ATTRIBUTE_DIRECTORY;
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pEntry->CreationDate=0x21;
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pEntry->UpdateDate=0x21;
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//calculate checksum for 8.3 name
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//construct slots and entry
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for(i=nbSlots-2;i>=0;i--)
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{
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DPRINT("construct slot %d\n",i);
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pSlots[i].attr=0xf;
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if (i)
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pSlots[i].id=nbSlots-i-1;
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else
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pSlots[i].id=nbSlots-i-1+0x40;
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// pSlots[i].alias_checksum=;
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// pSlots[i].start=;
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memcpy(pSlots[i].name0_4 ,FileName+(nbSlots-i-2)*13
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,5*sizeof(WCHAR));
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memcpy(pSlots[i].name5_10 ,FileName+(nbSlots-i-2)*13+5
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,6*sizeof(WCHAR));
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memcpy(pSlots[i].name11_12,FileName+(nbSlots-i-2)*13+11
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,2*sizeof(WCHAR));
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}
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//try to find nbSlots contiguous entries frees in directory
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for(i=0,status=STATUS_SUCCESS;status==STATUS_SUCCESS;i++)
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{
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status=FsdReadFile(DeviceExt,&FileObject,&FatEntry
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,sizeof(FATDirEntry),i*sizeof(FATDirEntry),&LengthRead);
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if(IsLastEntry(&FatEntry,0))
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break;
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if(IsDeletedEntry(&FatEntry,0)) nbFree++;
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else nbFree=0;
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if (nbFree==nbSlots) break;
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}
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DPRINT("NbFree %d, entry number %d\n",nbFree,i);
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CurrentCluster=GetNextWriteCluster(DeviceExt,0);
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// zero the cluster
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Buffer2=ExAllocatePool(NonPagedPool,DeviceExt->BytesPerCluster);
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memset(Buffer2,0,DeviceExt->BytesPerCluster);
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VFATWriteCluster(DeviceExt,Buffer2,CurrentCluster);
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ExFreePool(Buffer2);
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if (DeviceExt->FatType == FAT32)
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{
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pEntry->FirstClusterHigh=CurrentCluster>>16;
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pEntry->FirstCluster=CurrentCluster;
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}
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else
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pEntry->FirstCluster=CurrentCluster;
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if(nbFree==nbSlots)
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{//use old slots
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Offset=(i-nbSlots+1)*sizeof(FATDirEntry);
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status=FsdWriteFile(DeviceExt,&FileObject,Buffer
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,sizeof(FATDirEntry)*nbSlots,Offset);
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}
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else
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{//write at end of directory
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Offset=(i-nbFree)*sizeof(FATDirEntry);
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status=FsdWriteFile(DeviceExt,&FileObject,Buffer
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,sizeof(FATDirEntry)*(nbSlots+1),Offset);
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}
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DPRINT("write entry offset %d status=%x\n",Offset,status);
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newCCB = ExAllocatePool(NonPagedPool,sizeof(VfatCCB));
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newFCB = ExAllocatePool(NonPagedPool,sizeof(VfatFCB));
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memset(newCCB,0,sizeof(VfatCCB));
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memset(newFCB,0,sizeof(VfatFCB));
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newCCB->pFcb=newFCB;
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newCCB->PtrFileObject=pFileObject;
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newFCB->RefCount++;
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//FIXME : initialize all fields in FCB and CCB
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newFCB->nextFcb=pFirstFcb;
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memcpy(&newFCB->entry,pEntry,sizeof(FATDirEntry));
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DPRINT("new : entry=%11.11s\n",newFCB->entry.Filename);
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DPRINT("new : entry=%11.11s\n",pEntry->Filename);
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pFirstFcb=newFCB;
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vfat_wcsncpy(newFCB->PathName,PathFileName,MAX_PATH);
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newFCB->ObjectName=newFCB->PathName+(PathFileName-FileName);
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newFCB->pDevExt=DeviceExt;
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pFileObject->FsContext =(PVOID) &newFCB->NTRequiredFCB;
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pFileObject->FsContext2 = newCCB;
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if(RequestedOptions&FILE_DIRECTORY_FILE)
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{
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// create . and ..
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memcpy(pEntry->Filename,". ",11);
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status=FsdWriteFile(DeviceExt,pFileObject,pEntry
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,sizeof(FATDirEntry),0L);
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pEntry->FirstCluster
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=((VfatCCB *)(FileObject.FsContext2))->pFcb->entry.FirstCluster;
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pEntry->FirstClusterHigh
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=((VfatCCB *)(FileObject.FsContext2))->pFcb->entry.FirstClusterHigh;
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memcpy(pEntry->Filename,".. ",11);
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if(pEntry->FirstCluster==1 && DeviceExt->FatType!=FAT32)
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pEntry->FirstCluster=0;
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status=FsdWriteFile(DeviceExt,pFileObject,pEntry
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,sizeof(FATDirEntry),sizeof(FATDirEntry));
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}
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FsdCloseFile(DeviceExt,&FileObject);
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ExFreePool(Buffer);
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DPRINT("addentry ok\n");
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return STATUS_SUCCESS;
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}
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