dlls/rpcrt4/ndr_fullpointer.c

   1 /*
   2  * Full Pointer Translation Routines
   3  *
   4  * Copyright 2006 Robert Shearman
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include <stdarg.h>
  22
  23 #include "windef.h"
  24 #include "winbase.h"
  25 #include "rpc.h"
  26 #include "rpcndr.h"
  27
  28 #include "wine/debug.h"
  29
  30 WINE_DEFAULT_DEBUG_CHANNEL(rpc);
  31
  32 PFULL_PTR_XLAT_TABLES WINAPI NdrFullPointerXlatInit(ULONG NumberOfPointers,
  33                                                     XLAT_SIDE XlatSide)
  34 {
  35     ULONG NumberOfBuckets;
  36     PFULL_PTR_XLAT_TABLES pXlatTables = HeapAlloc(GetProcessHeap(), 0, sizeof(*pXlatTables));
  37
  38     TRACE("(%d, %d)\n", NumberOfPointers, XlatSide);
  39
  40     if (!NumberOfPointers) NumberOfPointers = 512;
  41     NumberOfBuckets = ((NumberOfPointers + 3) & ~3) - 1;
  42
  43     pXlatTables->RefIdToPointer.XlatTable =
  44         HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY,
  45             sizeof(void *) * NumberOfPointers);
  46     pXlatTables->RefIdToPointer.StateTable =
  47         HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY,
  48             sizeof(unsigned char) * NumberOfPointers);
  49     pXlatTables->RefIdToPointer.NumberOfEntries = NumberOfPointers;
  50
  51     TRACE("NumberOfBuckets = %d\n", NumberOfBuckets);
  52     pXlatTables->PointerToRefId.XlatTable =
  53         HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY,
  54             sizeof(PFULL_PTR_TO_REFID_ELEMENT) * NumberOfBuckets);
  55     pXlatTables->PointerToRefId.NumberOfBuckets = NumberOfBuckets;
  56     pXlatTables->PointerToRefId.HashMask = NumberOfBuckets - 1;
  57
  58     pXlatTables->NextRefId = 1;
  59     pXlatTables->XlatSide = XlatSide;
  60
  61     return pXlatTables;
  62 }
  63
  64 void WINAPI NdrFullPointerXlatFree(PFULL_PTR_XLAT_TABLES pXlatTables)
  65 {
  66     TRACE("(%p)\n", pXlatTables);
  67
  68     HeapFree(GetProcessHeap(), 0, pXlatTables->RefIdToPointer.XlatTable);
  69     HeapFree(GetProcessHeap(), 0, pXlatTables->RefIdToPointer.StateTable);
  70     HeapFree(GetProcessHeap(), 0, pXlatTables->PointerToRefId.XlatTable);
  71
  72     HeapFree(GetProcessHeap(), 0, pXlatTables);
  73 }
  74
  75 static void expand_pointer_table_if_necessary(PFULL_PTR_XLAT_TABLES pXlatTables, ULONG RefId)
  76 {
  77     if (RefId >= pXlatTables->RefIdToPointer.NumberOfEntries)
  78     {
  79         pXlatTables->RefIdToPointer.NumberOfEntries = RefId * 2;
  80         pXlatTables->RefIdToPointer.XlatTable =
  81             HeapReAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY,
  82                 pXlatTables->RefIdToPointer.XlatTable,
  83                 sizeof(void *) * pXlatTables->RefIdToPointer.NumberOfEntries);
  84         pXlatTables->RefIdToPointer.StateTable =
  85             HeapReAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY,
  86                 pXlatTables->RefIdToPointer.StateTable,
  87                 sizeof(unsigned char) * pXlatTables->RefIdToPointer.NumberOfEntries);
  88
  89         if (!pXlatTables->RefIdToPointer.XlatTable || !pXlatTables->RefIdToPointer.StateTable)
  90             pXlatTables->RefIdToPointer.NumberOfEntries = 0;
  91     }
  92 }
  93
  94 int WINAPI NdrFullPointerQueryPointer(PFULL_PTR_XLAT_TABLES pXlatTables,
  95                                       void *pPointer, unsigned char QueryType,
  96                                       ULONG *pRefId )
  97 {
  98     ULONG Hash = 0;
  99     int i;
 100     PFULL_PTR_TO_REFID_ELEMENT XlatTableEntry;
 101
 102     TRACE("(%p, %p, %d, %p)\n", pXlatTables, pPointer, QueryType, pRefId);
 103
 104     if (!pPointer)
 105     {
 106         *pRefId = 0;
 107         return 1;
 108     }
 109
 110     /* simple hashing algorithm, don't know whether it matches native */
 111     for (i = 0; i < sizeof(pPointer); i++)
 112         Hash = (Hash * 3) ^ ((unsigned char *)&pPointer)[i];
 113
 114     XlatTableEntry = pXlatTables->PointerToRefId.XlatTable[Hash & pXlatTables->PointerToRefId.HashMask];
 115     for (; XlatTableEntry; XlatTableEntry = XlatTableEntry->Next)
 116         if (pPointer == XlatTableEntry->Pointer)
 117         {
 118             *pRefId = XlatTableEntry->RefId;
 119             if (XlatTableEntry->State & QueryType)
 120                 return 1;
 121             XlatTableEntry->State |= QueryType;
 122             return 0;
 123         }
 124
 125     XlatTableEntry = HeapAlloc(GetProcessHeap(), 0, sizeof(*XlatTableEntry));
 126     XlatTableEntry->Next = pXlatTables->PointerToRefId.XlatTable[Hash & pXlatTables->PointerToRefId.HashMask];
 127     XlatTableEntry->Pointer = pPointer;
 128     XlatTableEntry->RefId = *pRefId = pXlatTables->NextRefId++;
 129     XlatTableEntry->State = QueryType;
 130     pXlatTables->PointerToRefId.XlatTable[Hash & pXlatTables->PointerToRefId.HashMask] = XlatTableEntry;
 131
 132     /* insert pointer into mapping table */
 133     expand_pointer_table_if_necessary(pXlatTables, XlatTableEntry->RefId);
 134     if (pXlatTables->RefIdToPointer.NumberOfEntries > XlatTableEntry->RefId)
 135     {
 136         pXlatTables->RefIdToPointer.XlatTable[XlatTableEntry->RefId] = pPointer;
 137         pXlatTables->RefIdToPointer.StateTable[XlatTableEntry->RefId] = QueryType;
 138     }
 139
 140     return 0;
 141 }
 142
 143 int WINAPI NdrFullPointerQueryRefId(PFULL_PTR_XLAT_TABLES pXlatTables,
 144                                     ULONG RefId, unsigned char QueryType,
 145                                     void **ppPointer)
 146 {
 147     TRACE("(%p, 0x%x, %d, %p)\n", pXlatTables, RefId, QueryType, ppPointer);
 148
 149     expand_pointer_table_if_necessary(pXlatTables, RefId);
 150
 151     pXlatTables->NextRefId = max(RefId + 1, pXlatTables->NextRefId);
 152
 153     if (pXlatTables->RefIdToPointer.NumberOfEntries > RefId)
 154     {
 155         *ppPointer = pXlatTables->RefIdToPointer.XlatTable[RefId];
 156         if (QueryType)
 157         {
 158             if (pXlatTables->RefIdToPointer.StateTable[RefId] & QueryType)
 159                 return 1;
 160             pXlatTables->RefIdToPointer.StateTable[RefId] |= QueryType;
 161             return 0;
 162         }
 163         else
 164             return 0;
 165     }
 166     *ppPointer = NULL;
 167     return 0;
 168 }
 169
 170 void WINAPI NdrFullPointerInsertRefId(PFULL_PTR_XLAT_TABLES pXlatTables,
 171                                       ULONG RefId, void *pPointer)
 172 {
 173     ULONG Hash = 0;
 174     int i;
 175     PFULL_PTR_TO_REFID_ELEMENT XlatTableEntry;
 176
 177     TRACE("(%p, 0x%x, %p)\n", pXlatTables, RefId, pPointer);
 178
 179     /* simple hashing algorithm, don't know whether it matches native */
 180     for (i = 0; i < sizeof(pPointer); i++)
 181         Hash = (Hash * 3) ^ ((unsigned char *)&pPointer)[i];
 182
 183     XlatTableEntry = HeapAlloc(GetProcessHeap(), 0, sizeof(*XlatTableEntry));
 184     XlatTableEntry->Next = pXlatTables->PointerToRefId.XlatTable[Hash & pXlatTables->PointerToRefId.HashMask];
 185     XlatTableEntry->Pointer = pPointer;
 186     XlatTableEntry->RefId = RefId;
 187     XlatTableEntry->State = 0;
 188     pXlatTables->PointerToRefId.XlatTable[Hash & pXlatTables->PointerToRefId.HashMask] = XlatTableEntry;
 189
 190     /* insert pointer into mapping table */
 191     expand_pointer_table_if_necessary(pXlatTables, RefId);
 192     if (pXlatTables->RefIdToPointer.NumberOfEntries > RefId)
 193         pXlatTables->RefIdToPointer.XlatTable[XlatTableEntry->RefId] = pPointer;
 194 }
 195
 196 int WINAPI NdrFullPointerFree(PFULL_PTR_XLAT_TABLES pXlatTables, void *Pointer)
 197 {
 198     ULONG Hash = 0;
 199     int i;
 200     PFULL_PTR_TO_REFID_ELEMENT XlatTableEntry;
 201     ULONG RefId = 0;
 202
 203     TRACE("(%p, %p)\n", pXlatTables, Pointer);
 204
 205     if (!Pointer)
 206         return 1;
 207
 208     /* simple hashing algorithm, don't know whether it matches native */
 209     for (i = 0; i < sizeof(Pointer); i++)
 210         Hash = (Hash * 3) ^ ((unsigned char *)&Pointer)[i];
 211
 212     XlatTableEntry = pXlatTables->PointerToRefId.XlatTable[Hash & pXlatTables->PointerToRefId.HashMask];
 213     for (; XlatTableEntry; XlatTableEntry = XlatTableEntry->Next)
 214         if (Pointer == XlatTableEntry->Pointer)
 215         {
 216             if (XlatTableEntry->State & 0x20)
 217                 return 0;
 218             XlatTableEntry->State |= 0x20;
 219             RefId = XlatTableEntry->RefId;
 220             break;
 221         }
 222
 223     if (!XlatTableEntry)
 224         return 0;
 225
 226     if (pXlatTables->RefIdToPointer.NumberOfEntries > RefId)
 227     {
 228         pXlatTables->RefIdToPointer.StateTable[RefId] |= 0x20;
 229         return 1;
 230     }
 231
 232     return 0;
 233 }