reactos/dll/win32/shlwapi/clist.c

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/*
* SHLWAPI DataBlock List functions
*
* Copyright 2002 Jon Griffiths
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <stdarg.h>
#include <string.h>
#define COBJMACROS
#include "windef.h"
#include "winbase.h"
#include "winuser.h"
#include "objbase.h"
#include "shlobj.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(shell);
/* dwSignature for contained DATABLOCK_HEADER items */
#define CLIST_ID_CONTAINER (~0U)
/*************************************************************************
* NextItem
*
* Internal helper: move a DataBlock pointer to the next item.
*/
static inline LPDATABLOCK_HEADER NextItem(LPDBLIST lpList)
{
char* address = (char*)lpList;
address += lpList->cbSize;
return (LPDATABLOCK_HEADER)address;
}
/*************************************************************************
* @ [SHLWAPI.20]
*
* Insert a new item into a DataBlock list.
*
* PARAMS
* lppList [0] Pointer to the List
* lpNewItem [I] The new item to add to the list
*
* RETURNS
* Success: S_OK. The item is added to the list.
* Failure: An HRESULT error code.
*
* NOTES
* If the size of the element to be inserted is less than the size of a
* DATABLOCK_HEADER node, or the Id for the item is CLIST_ID_CONTAINER,
* the call returns S_OK but does not actually add the element.
* See SHWriteDataBlockList.
*/
BOOL WINAPI SHAddDataBlock(LPDBLIST* lppList, const DATABLOCK_HEADER *lpNewItem)
{
LPDATABLOCK_HEADER lpInsertAt = NULL;
ULONG ulSize;
TRACE("(%p,%p)\n", lppList, lpNewItem);
if(!lppList || !lpNewItem)
return FALSE;
if (lpNewItem->cbSize < sizeof(DATABLOCK_HEADER) ||
lpNewItem->dwSignature == CLIST_ID_CONTAINER)
return FALSE;
ulSize = lpNewItem->cbSize;
if(ulSize & 0x3)
{
/* Tune size to a ULONG boundary, add space for container element */
ulSize = ((ulSize + 0x3) & 0xFFFFFFFC) + sizeof(DATABLOCK_HEADER);
TRACE("Creating container item, new size = %d\n", ulSize);
}
if(!*lppList)
{
/* An empty list. Allocate space for terminal ulSize also */
*lppList = LocalAlloc(LMEM_ZEROINIT, ulSize + sizeof(ULONG));
lpInsertAt = *lppList;
}
else
{
/* Append to the end of the list */
ULONG ulTotalSize = 0;
LPDATABLOCK_HEADER lpIter = *lppList;
/* Iterate to the end of the list, calculating the total size */
while (lpIter->cbSize)
{
ulTotalSize += lpIter->cbSize;
lpIter = NextItem(lpIter);
}
/* Increase the size of the list */
lpIter = LocalReAlloc(*lppList, ulTotalSize + ulSize+sizeof(ULONG),
LMEM_ZEROINIT | LMEM_MOVEABLE);
if(lpIter)
{
*lppList = lpIter;
lpInsertAt = (LPDATABLOCK_HEADER)((char*)lpIter + ulTotalSize); /* At end */
}
}
if(lpInsertAt)
{
/* Copy in the new item */
LPDATABLOCK_HEADER lpDest = lpInsertAt;
if(ulSize != lpNewItem->cbSize)
{
lpInsertAt->cbSize = ulSize;
lpInsertAt->dwSignature = CLIST_ID_CONTAINER;
lpDest++;
}
memcpy(lpDest, lpNewItem, lpNewItem->cbSize);
/* Terminate the list */
lpInsertAt = NextItem(lpInsertAt);
lpInsertAt->cbSize = 0;
return TRUE;
}
return FALSE;
}
/*************************************************************************
* @ [SHLWAPI.17]
*
* Write a DataBlock list to an IStream object.
*
* PARAMS
* lpStream [I] IStream object to write the list to
* lpList [I] List of items to write
*
* RETURNS
* Success: S_OK. The object is written to the stream.
* Failure: An HRESULT error code
*
* NOTES
* Ordinals 17,18,19,20,21 and 22 are related and together provide a compact
* list structure (a "DataBlock List"), which may be stored and retrieved from
* an IStream object.
*
* The exposed API consists of:
*
* - SHWriteDataBlockList() - Write a DataBlock list to a stream,
* - SHReadDataBlockList() - Read and create a list from a stream,
* - SHFreeDataBlockList() - Free a list,
* - SHAddDataBlock() - Insert a new item into a list,
* - SHRemoveDataBlock() - Remove an item from a list,
* - SHFindDataBlock() - Find an item in a list.
*
* The DataBlock list is stored packed into a memory array. Each element has a
* size and an associated ID. Elements must be less than 64k if the list is
* to be subsequently read from a stream.
*
* Elements are aligned on DWORD boundaries. If an elements data size is not
* a DWORD size multiple, the element is wrapped by inserting a surrounding
* element with an Id of 0xFFFFFFFF, and size sufficient to pad to a DWORD boundary.
*
* These functions are slow for large objects and long lists.
*/
HRESULT WINAPI SHWriteDataBlockList(IStream* lpStream, LPDBLIST lpList)
{
ULONG ulSize;
HRESULT hRet = S_OK;
TRACE("(%p,%p)\n", lpStream, lpList);
if(lpList)
{
while (lpList->cbSize)
{
LPDATABLOCK_HEADER lpItem = lpList;
if(lpList->dwSignature == CLIST_ID_CONTAINER)
lpItem++;
hRet = IStream_Write(lpStream,lpItem,lpItem->cbSize,&ulSize);
if (FAILED(hRet))
return hRet;
if(lpItem->cbSize != ulSize)
return STG_E_MEDIUMFULL;
lpList = NextItem(lpList);
}
}
if(SUCCEEDED(hRet))
{
ULONG ulDummy;
ulSize = 0;
/* Write a terminating list entry with zero size */
hRet = IStream_Write(lpStream, &ulSize,sizeof(ulSize),&ulDummy);
}
return hRet;
}
/*************************************************************************
* @ [SHLWAPI.18]
*
* Read and create a DataBlock list from an IStream object.
*
* PARAMS
* lpStream [I] Stream to read the list from
* lppList [0] Pointer to receive the new List
*
* RETURNS
* Success: S_OK
* Failure: An HRESULT error code
*
* NOTES
* When read from a file, list objects are limited in size to 64k.
* See SHWriteDataBlockList.
*/
HRESULT WINAPI SHReadDataBlockList(IStream* lpStream, LPDBLIST* lppList)
{
DATABLOCK_HEADER bBuff[128]; /* Temporary storage for new list item */
ULONG ulBuffSize = sizeof(bBuff);
LPDATABLOCK_HEADER pItem = bBuff;
ULONG ulRead, ulSize;
HRESULT hRet = S_OK;
TRACE("(%p,%p)\n", lpStream, lppList);
if(*lppList)
{
/* Free any existing list */
LocalFree(*lppList);
*lppList = NULL;
}
do
{
/* Read the size of the next item */
hRet = IStream_Read(lpStream, &ulSize,sizeof(ulSize),&ulRead);
if(FAILED(hRet) || ulRead != sizeof(ulSize) || !ulSize)
break; /* Read failed or read zero size (the end of the list) */
if(ulSize > 0xFFFF)
{
LARGE_INTEGER liZero;
ULARGE_INTEGER ulPos;
liZero.QuadPart = 0;
/* Back the stream up; this object is too big for the list */
if(SUCCEEDED(IStream_Seek(lpStream, liZero, STREAM_SEEK_CUR, &ulPos)))
{
liZero.QuadPart = ulPos.QuadPart - sizeof(ULONG);
IStream_Seek(lpStream, liZero, STREAM_SEEK_SET, NULL);
}
break;
}
else if (ulSize >= sizeof(DATABLOCK_HEADER))
{
/* Add this new item to the list */
if(ulSize > ulBuffSize)
{
/* We need more buffer space, allocate it */
LPDATABLOCK_HEADER lpTemp;
if (pItem == bBuff)
lpTemp = LocalAlloc(LMEM_ZEROINIT, ulSize);
else
lpTemp = LocalReAlloc(pItem, ulSize, LMEM_ZEROINIT|LMEM_MOVEABLE);
if(!lpTemp)
{
hRet = E_OUTOFMEMORY;
break;
}
ulBuffSize = ulSize;
pItem = lpTemp;
}
pItem->cbSize = ulSize;
ulSize -= sizeof(pItem->cbSize); /* already read this member */
/* Read the item Id and data */
hRet = IStream_Read(lpStream, &pItem->dwSignature, ulSize, &ulRead);
if(FAILED(hRet) || ulRead != ulSize)
break;
SHAddDataBlock(lppList, pItem); /* Insert Item */
}
} while(1);
/* If we allocated space, free it */
if(pItem != bBuff)
LocalFree(pItem);
return hRet;
}
/*************************************************************************
* @ [SHLWAPI.19]
*
* Free a DataBlock list.
*
* PARAMS
* lpList [I] List to free
*
* RETURNS
* Nothing.
*
* NOTES
* See SHWriteDataBlockList.
*/
VOID WINAPI SHFreeDataBlockList(LPDBLIST lpList)
{
TRACE("(%p)\n", lpList);
if (lpList)
LocalFree(lpList);
}
/*************************************************************************
* @ [SHLWAPI.21]
*
* Remove an item from a DataBlock list.
*
* PARAMS
* lppList [O] List to remove the item from
* dwSignature [I] Id of item to remove
*
* RETURNS
* Success: TRUE.
* Failure: FALSE, If any parameters are invalid, or the item was not found.
*
* NOTES
* See SHWriteDataBlockList.
*/
BOOL WINAPI SHRemoveDataBlock(LPDBLIST* lppList, DWORD dwSignature)
{
LPDATABLOCK_HEADER lpList = NULL;
LPDATABLOCK_HEADER lpItem = NULL;
LPDATABLOCK_HEADER lpNext;
ULONG ulNewSize;
TRACE("(%p,%d)\n", lppList, dwSignature);
if(lppList && (lpList = *lppList))
{
/* Search for item in list */
while (lpList->cbSize)
{
if(lpList->dwSignature == dwSignature ||
(lpList->dwSignature == CLIST_ID_CONTAINER && lpList[1].dwSignature == dwSignature))
{
lpItem = lpList; /* Found */
break;
}
lpList = NextItem(lpList);
}
}
if(!lpItem)
return FALSE;
lpList = lpNext = NextItem(lpItem);
/* Locate the end of the list */
while (lpList->cbSize)
lpList = NextItem(lpList);
/* Resize the list */
ulNewSize = LocalSize(*lppList) - lpItem->cbSize;
/* Copy following elements over lpItem */
memmove(lpItem, lpNext, (char *)lpList - (char *)lpNext + sizeof(ULONG));
if(ulNewSize <= sizeof(ULONG))
{
LocalFree(*lppList);
*lppList = NULL; /* Removed the last element */
}
else
{
lpList = LocalReAlloc(*lppList, ulNewSize, LMEM_ZEROINIT|LMEM_MOVEABLE);
if(lpList)
*lppList = lpList;
}
return TRUE;
}
/*************************************************************************
* @ [SHLWAPI.22]
*
* Find an item in a DataBlock list.
*
* PARAMS
* lpList [I] List to search
* dwSignature [I] Id of item to find
*
* RETURNS
* Success: A pointer to the list item found
* Failure: NULL
*
* NOTES
* See SHWriteDataBlockList.
*/
DATABLOCK_HEADER* WINAPI SHFindDataBlock(LPDBLIST lpList, DWORD dwSignature)
{
TRACE("(%p,%d)\n", lpList, dwSignature);
if(lpList)
{
while(lpList->cbSize)
{
if(lpList->dwSignature == dwSignature)
return lpList; /* Matched */
else if(lpList->dwSignature == CLIST_ID_CONTAINER && lpList[1].dwSignature == dwSignature)
return lpList + 1; /* Contained item matches */
lpList = NextItem(lpList);
}
}
return NULL;
}