252 lines
7.4 KiB
C
252 lines
7.4 KiB
C
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/****************************************************************************
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*
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* drvproc.c
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*
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***************************************************************************/
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/**************************************************************************
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*
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* THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
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* KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
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* PURPOSE.
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*
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* Copyright (c) 1991 - 1995 Microsoft Corporation. All Rights Reserved.
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*
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**************************************************************************/
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#include <windows.h>
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#include <windowsx.h>
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#include <mmsystem.h>
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#include <compddk.h>
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#include "msrle.h"
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HMODULE ghModule;
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/***************************************************************************
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* @doc INTERNAL
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*
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* @api LRESULT | DriverProc | The entry point for an installable driver.
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*
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* @parm DWORD | dwDriverId | For most messages, <p dwDriverId> is the DWORD
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* value that the driver returns in response to a <m DRV_OPEN> message.
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* Each time that the driver is opened, through the <f DrvOpen> API,
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* the driver receives a <m DRV_OPEN> message and can return an
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* arbitrary, non-zero value. The installable driver interface
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* saves this value and returns a unique driver handle to the
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* application. Whenever the application sends a message to the
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* driver using the driver handle, the interface routes the message
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* to this entry point and passes the corresponding <p dwDriverId>.
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* This mechanism allows the driver to use the same or different
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* identifiers for multiple opens but ensures that driver handles
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* are unique at the application interface layer.
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*
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* The following messages are not related to a particular open
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* instance of the driver. For these messages, the dwDriverId
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* will always be zero.
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*
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* DRV_LOAD, DRV_FREE, DRV_ENABLE, DRV_DISABLE, DRV_OPEN
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*
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* @parm HDRVR | hDriver | This is the handle returned to the
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* application by the driver interface.
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*
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* @parm UINT | uiMessage | The requested action to be performed. Message
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* values below <m DRV_RESERVED> are used for globally defined messages.
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* Message values from <m DRV_RESERVED> to <m DRV_USER> are used for
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* defined driver protocols. Messages above <m DRV_USER> are used
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* for driver specific messages.
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*
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* @parm LPARAM | lParam1 | Data for this message. Defined separately for
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* each message
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*
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* @parm LPARAM | lParam2 | Data for this message. Defined separately for
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* each message
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*
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* @rdesc Defined separately for each message.
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***************************************************************************/
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LRESULT FAR PASCAL _loadds DriverProc(DWORD dwDriverID, HDRVR hDriver, UINT uiMessage, LPARAM lParam1, LPARAM lParam2)
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{
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PRLEINST pri = dwDriverID != -1 ? (PRLEINST)(UINT)dwDriverID : NULL;
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switch (uiMessage)
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{
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case DRV_LOAD:
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#ifdef _WIN32
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if (ghModule) {
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// AVI explicitly loads us as well, but does not pass the
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// correct (as known by WINMM) driver handle.
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} else {
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ghModule = (HANDLE) GetDriverModuleHandle(hDriver);
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}
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#endif
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RleLoad();
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return (LRESULT)1L;
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case DRV_FREE:
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RleFree();
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return (LRESULT)1L;
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case DRV_OPEN:
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// if being opened with no open struct, then return a non-zero
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// value without actually opening
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if (lParam2 == 0L)
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return -1l;
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return (LRESULT)(DWORD)(UINT)RleOpen();
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case DRV_CLOSE:
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if (pri)
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RleClose(pri);
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return (LRESULT)1L;
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/*********************************************************************
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state messages
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*********************************************************************/
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case ICM_GETSTATE:
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return RleGetState(pri, (LPVOID)lParam1, (DWORD)lParam2);
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case ICM_SETSTATE:
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return RleSetState(pri, (LPVOID)lParam1, (DWORD)lParam2);
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case ICM_GETINFO:
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return RleGetInfo(pri, (ICINFO FAR *)lParam1, (DWORD)lParam2);
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case ICM_GETDEFAULTQUALITY:
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if (lParam1)
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{
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*((LPDWORD)lParam1) = QUALITY_DEFAULT;
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return ICERR_OK;
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}
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break;
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/*********************************************************************
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compression messages
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*********************************************************************/
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case ICM_COMPRESS_QUERY:
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return RleCompressQuery(pri,
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(LPBITMAPINFOHEADER)lParam1,
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(LPBITMAPINFOHEADER)lParam2);
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case ICM_COMPRESS_BEGIN:
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return RleCompressBegin(pri,
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(LPBITMAPINFOHEADER)lParam1,
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(LPBITMAPINFOHEADER)lParam2);
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case ICM_COMPRESS_GET_FORMAT:
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return RleCompressGetFormat(pri,
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(LPBITMAPINFOHEADER)lParam1,
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(LPBITMAPINFOHEADER)lParam2);
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case ICM_COMPRESS_GET_SIZE:
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return RleCompressGetSize(pri,
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(LPBITMAPINFOHEADER)lParam1,
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(LPBITMAPINFOHEADER)lParam2);
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case ICM_COMPRESS:
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return RleCompress(pri,
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(ICCOMPRESS FAR *)lParam1, (DWORD)lParam2);
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case ICM_COMPRESS_END:
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return RleCompressEnd(pri);
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/*********************************************************************
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decompress messages
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*********************************************************************/
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case ICM_DECOMPRESS_QUERY:
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return RleDecompressQuery(pri,
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(LPBITMAPINFOHEADER)lParam1,
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(LPBITMAPINFOHEADER)lParam2);
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case ICM_DECOMPRESS_BEGIN:
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return RleDecompressBegin(pri,
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(LPBITMAPINFOHEADER)lParam1,
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(LPBITMAPINFOHEADER)lParam2);
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case ICM_DECOMPRESS_GET_FORMAT:
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return RleDecompressGetFormat(pri,
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(LPBITMAPINFOHEADER)lParam1,
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(LPBITMAPINFOHEADER)lParam2);
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case ICM_DECOMPRESS:
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return RleDecompress(pri,
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(ICDECOMPRESS FAR *)lParam1, (DWORD)lParam2);
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case ICM_DECOMPRESS_END:
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return RleDecompressEnd(pri);
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/*********************************************************************
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standard driver messages
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*********************************************************************/
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case DRV_DISABLE:
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case DRV_ENABLE:
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return (LRESULT)1L;
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case DRV_INSTALL:
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case DRV_REMOVE:
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return (LRESULT)DRV_OK;
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}
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if (uiMessage < DRV_USER)
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return DefDriverProc(dwDriverID, hDriver, uiMessage,lParam1,lParam2);
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else
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return ICERR_UNSUPPORTED;
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}
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/****************************************************************************
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* @doc INTERNAL
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*
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* @api int | LibMain | Library initialization code.
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*
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* @parm HANDLE | hModule | Our module handle.
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*
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* @parm WORD | wHeapSize | The heap size from the .def file.
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*
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* @parm LPSTR | lpCmdLine | The command line.
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*
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* @rdesc Returns 1 if the initialization was successful and 0 otherwise.
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***************************************************************************/
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#ifndef _WIN32
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int NEAR PASCAL LibMain(HMODULE hModule, WORD wHeapSize, LPSTR lpCmdLine)
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{
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ghModule = hModule;
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return 1;
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}
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#endif
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#if 0 // NO DLL load proc needed
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// NOTE: ghModule Will be set up on DRV_LOAD call
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#ifdef _WIN32
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BOOL WINAPI DLLEntryPoint(HINSTANCE hModule, ULONG Reason, LPVOID pv)
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{
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switch (Reason)
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{
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case DLL_PROCESS_ATTACH:
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ghModule = hModule;
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DisableThreadLibraryCalls(hModule);
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break;
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case DLL_PROCESS_DETACH:
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break;
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}
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return TRUE;
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}
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#endif
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#endif // if 0
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