dll/win32/twain_32/twain32_main.c

   1 /*
   2  * TWAIN32 functions
   3  *
   4  * Copyright 2000 Shi Quan He <shiquan@cyberdude.com>
   5  * Copyright 2006 Marcus Meissner
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  */
  21
  22 #include "twain_i.h"
  23
  24 /* A helper function that looks up a destination identity in the active
  25    source list */
  26 static activeDS *TWAIN_LookupSource (const TW_IDENTITY *pDest)
  27 {
  28     activeDS *pSource;
  29
  30     for (pSource = activeSources; pSource; pSource = pSource->next)
  31         if (pSource->identity.Id == pDest->Id)
  32             break;
  33     return pSource;
  34 }
  35
  36 static TW_UINT16 TWAIN_SourceManagerHandler (
  37            pTW_IDENTITY pOrigin,
  38            TW_UINT16   DAT,
  39            TW_UINT16   MSG,
  40            TW_MEMREF   pData)
  41 {
  42     TW_UINT16 twRC = TWRC_SUCCESS;
  43
  44     switch (DAT)
  45     {
  46         case DAT_IDENTITY:
  47             switch (MSG)
  48             {
  49                 case MSG_CLOSEDS:
  50                     twRC = TWAIN_CloseDS (pOrigin, pData);
  51                     break;
  52
  53                 case MSG_GETDEFAULT:
  54                     twRC = TWAIN_IdentityGetDefault (pOrigin, pData);
  55                     break;
  56
  57                 case MSG_GETFIRST:
  58                     twRC = TWAIN_IdentityGetFirst (pOrigin, pData);
  59                     break;
  60
  61                 case MSG_GETNEXT:
  62                     twRC = TWAIN_IdentityGetNext (pOrigin, pData);
  63                     break;
  64
  65                 case MSG_OPENDS:
  66                     twRC = TWAIN_OpenDS (pOrigin, pData);
  67                     break;
  68
  69                 case MSG_USERSELECT:
  70                     twRC = TWAIN_UserSelect (pOrigin, pData);
  71                     break;
  72
  73                 default:
  74                     /* Unrecognized operation triplet */
  75                     twRC = TWRC_FAILURE;
  76                     DSM_twCC = TWCC_BADPROTOCOL;
  77                     WARN("unrecognized operation triplet\n");
  78                     break;
  79             }
  80             break;
  81
  82         case DAT_PARENT:
  83             switch (MSG)
  84             {
  85                 case MSG_CLOSEDSM:
  86                     twRC = TWAIN_CloseDSM (pOrigin, pData);
  87                     break;
  88
  89                 case MSG_OPENDSM:
  90                     twRC = TWAIN_OpenDSM (pOrigin, pData);
  91                     break;
  92
  93                 default:
  94                     /* Unrecognized operation triplet */
  95                     twRC = TWRC_FAILURE;
  96                     DSM_twCC = TWCC_BADPROTOCOL;
  97                     WARN("unrecognized operation triplet\n");
  98             }
  99             break;
 100
 101         case DAT_STATUS:
 102             if (MSG == MSG_GET) {
 103                 twRC = TWAIN_GetDSMStatus (pOrigin, pData);
 104             } else {
 105                 twRC = TWRC_FAILURE;
 106                 DSM_twCC = TWCC_BADPROTOCOL;
 107                 WARN("unrecognized operation triplet\n");
 108             }
 109             break;
 110
 111         default:
 112             twRC = TWRC_FAILURE;
 113             DSM_twCC = TWCC_BADPROTOCOL;
 114             WARN("unrecognized operation triplet\n");
 115             break;
 116     }
 117
 118     return twRC;
 119 }
 120
 121
 122 /* Main entry point for the TWAIN library */
 123 TW_UINT16 WINAPI
 124 DSM_Entry (pTW_IDENTITY pOrigin,
 125            pTW_IDENTITY pDest,
 126            TW_UINT32    DG,
 127            TW_UINT16    DAT,
 128            TW_UINT16    MSG,
 129            TW_MEMREF    pData)
 130 {
 131     TW_UINT16 twRC = TWRC_SUCCESS;  /* Return Code */
 132
 133     TRACE("(DG=%d DAT=%d MSG=%d)\n", DG, DAT, MSG);
 134
 135     if (pDest)
 136     {
 137         activeDS *pSource = TWAIN_LookupSource (pDest);
 138         /* This operation's destination is a source */
 139
 140         if (!pSource) {
 141             ERR("No source associated with pDest %p\n", pDest);
 142             DSM_twCC = TWCC_BADDEST;
 143             return TWRC_FAILURE;
 144         }
 145         DSM_twCC = TWCC_SUCCESS;
 146         TRACE("Forwarding %d/%d/%d/%p to DS.\n", DG, DAT, MSG, pData);
 147         twRC = pSource->dsEntry(pOrigin, DG, DAT, MSG, pData);
 148         TRACE("return value is %d\n", twRC);
 149         return twRC;
 150     }
 151     switch (DG)
 152     {
 153         case DG_CONTROL:
 154             twRC = TWAIN_SourceManagerHandler (pOrigin, DAT, MSG, pData);
 155             break;
 156         default:
 157             FIXME("The DSM does not handle DG %d\n", DG);
 158             DSM_twCC = TWCC_BADPROTOCOL;
 159             twRC = TWRC_FAILURE;
 160     }
 161     return twRC;
 162 }