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ioopen.c
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C/C++ Source or Header
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1996-11-19
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11KB
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260 lines
/*************************START OF SPECIFICATIONS *************************/
/* SOURCE FILE NAME: IOOPEN.C */
/* */
/* DESCRIPTIVE NAME: File Format IO Proc routine for MMIOM_OPEN. */
/* */
/* COPYRIGHT: IBM - International Business Machines */
/* Copyright (c) IBM Corporation 1991, 1992, 1993 */
/* All Rights Reserved */
/* */
/* STATUS: OS/2 Release 2.0 */
/* */
/* FUNCTION: This source module contains the open routine, and other */
/* routines that support IOProcOpen. */
/* NOTES: */
/* DEPENDENCIES: none */
/* */
/* ENTRY POINTS: */
/* IOProcOpen */
/* */
/************************* END OF SPECIFICATIONS **************************/
#define INCL_DOS
#define INCL_DOSPROCESS
#define INCL_DOSDATETIME
#define INCL_ERRORS
#define INCL_WIN
#define INCL_GPI
#include <os2.h> /* OS/2 headers. */
#include <pmbitmap.h>
#define INCL_OS2MM
#define INCL_MMIO_CODEC
#define INCL_MMIO_DOSIOPROC
#include <os2me.h> /* Multi-Media IO extensions.*/
#include <hhpheap.h>
#define INCL_DBCSCRT
#include <mmiocrt.h>
#include <ioi.h>
extern HHUGEHEAP hheap;
extern HMTX hmtxGlobalHeap;
/************************** START OF SPECIFICATIONS *************************/
/* */
/* SUBROUTINE NAME: IOProcOpen */
/* */
/* DESCRIPTIVE NAME: open Digital Video file. */
/* */
/* FUNCTION: This function opens digital video file, allocates instance */
/* structure, reads header, calls file format specific open */
/* routine to init the track information. */
/* */
/* NOTES: None */
/* */
/* ENTRY POINT: IOProcOpen */
/* LINKAGE: CALL FAR (00:32) */
/* */
/* INPUT: */
/* PMMIOINFO pmmioinfo - Pointer to MMIOINFO staus structure. */
/* PSZ pszFileName - Name of file to be opened. */
/* */
/* EXIT-NORMAL: */
/* MMIO_SUCCESS */
/* */
/* EXIT-ERROR: */
/* MMIO_ERROR */
/* MMIOERR_INVALID_ACCESS_FLAG */
/* MMIOERR_OUTOFMEMORY */
/* io proc specific error */
/* */
/* SIDE EFFECTS: */
/* */
/*************************** END OF SPECIFICATIONS **************************/
LONG IOProcOpen (PMMIOINFO pmmioinfo, PSZ pszFileName) {
LONG rc = MMIO_SUCCESS, openType = -1;
LONG lFilePosition; // Logical file position
MMIOINFO Localmmioinfo; // Locally used
PINSTANCE pinstance;
PTIB ptib; // thread info block
PPIB ppib; // process info block
if (pmmioinfo == NULL) return MMIO_ERROR;
if (CheckMem((PVOID)pmmioinfo, sizeof(MMIOINFO), PAG_WRITE))
return MMIO_ERROR;
// Validate the open flags for this File Format IO Proc
// INVALID_OPEN_FLAGS must be defined in the ff.h - file format
// specific header file
if (pmmioinfo->ulFlags & INVALID_OPEN_FLAGS) {
pmmioinfo->ulErrorRet = MMIOERR_INVALID_ACCESS_FLAG;
return MMIOERR_INVALID_ACCESS_FLAG;
// return MMIO_ERROR;
}
// Allocate local instance structure
ENTERCRITX;
if ((pinstance = (PINSTANCE)HhpAllocMem(hheap,sizeof(INSTANCE))) == NULL) {
EXITCRIT;
pmmioinfo->ulErrorRet = MMIOERR_OUTOFMEMORY;
return MMIOERR_OUTOFMEMORY;
// return MMIO_ERROR;
}
EXITCRIT;
pmmioinfo->pExtraInfoStruct = (PVOID)pinstance; // save it's address
pmmioinfo->fccIOProc = HEX_FOURCC_FFIO; // Make sure this is set for codec loading
ioInstanceInit(pinstance);
// Allocate memory for pTempBuffer which is used when
// IOProcReadInterLeaved is called.
if (ENTERCRIT(rc)) {
ioCleanUp(pmmioinfo);
return MMIO_ERROR;
}
pinstance->pTempBuffer = HhpAllocMem(hheap, DEFAULTBUFFERSIZE);
if (pinstance->pTempBuffer == NULL) {
EXITCRIT;
pmmioinfo->ulErrorRet = MMIOERR_OUTOFMEMORY;
ioCleanUp(pmmioinfo);
return MMIO_ERROR;
}
EXITCRIT;
pinstance->ulTempBufferSize = DEFAULTBUFFERSIZE;
pinstance->lFileCurrentPosition = 0;
// set up the local MMIOINFO structure
Localmmioinfo = *pmmioinfo; // copy the original
Localmmioinfo.pIOProc = NULL;
Localmmioinfo.fccIOProc = pmmioinfo->fccChildIOProc;
Localmmioinfo.ulFlags |= MMIO_NOIDENTIFY; // Eliminate callbacks
Localmmioinfo.ulFlags &= ~MMIO_ALLOCBUF; // Force non-buffered open
// Determine if it is open for readonly or for write access
if ((pmmioinfo->ulFlags & MMIO_READ) && !(pmmioinfo->ulFlags & INVALID_READ_FLAGS))
openType = MMIO_READ;
else
if ((pmmioinfo->ulFlags & (MMIO_READWRITE | MMIO_WRITE)) &&!(pmmioinfo->ulFlags & INVALID_WRITE_FLAGS))
openType = MMIO_WRITE;
// Perform either read or write specific open processing
switch (openType) {
case MMIO_READ:
rc = ioIdentifyStorageSystem(&Localmmioinfo,pszFileName); // IOProc identifies Storage System
if (rc != MMIO_SUCCESS) break;
// Open the Movie file
if (pmmioinfo->fccChildIOProc != FOURCC_MEM ) {
Localmmioinfo.cchBuffer = 0;
Localmmioinfo.pchBuffer = NULL;
}
pinstance->hmmioFileHandle = mmioOpen(pszFileName, &Localmmioinfo, MMIO_NOIDENTIFY);
if (pinstance->hmmioFileHandle == 0) {
rc = Localmmioinfo.ulErrorRet;
break;
}
// call file format specific routine
rc = ffOpenRead(pmmioinfo, pinstance);
if (rc != MMIO_SUCCESS) break;
rc = ioAddTracksToMovieHeader(pinstance);
if (rc != MMIO_SUCCESS) break;
lFilePosition = ffSeekToDataBegin(pmmioinfo,pinstance);
pinstance->lFileCurrentPosition = lFilePosition;
if (lFilePosition < 0) rc = MMIOERR_INTERNAL_SYSTEM;
break;
case MMIO_WRITE:
if (!(pmmioinfo->ulFlags & MMIO_CREATE)) {
rc = ioIdentifyStorageSystem(&Localmmioinfo, pszFileName);
if (rc != MMIO_SUCCESS) break;
}
// Open the movie file
pinstance->hmmioFileHandle = mmioOpen(pszFileName, &Localmmioinfo, Localmmioinfo.ulFlags);
if (pinstance->hmmioFileHandle == 0) {
rc = Localmmioinfo.ulErrorRet;
break;
}
// call file format specific routine
rc = ffOpenWrite(pmmioinfo, pinstance); // call file format specific open routine
if (rc != MMIO_SUCCESS) break;
if (!(pmmioinfo->ulFlags & MMIO_CREATE)) {
rc = ioAddTracksToMovieHeader(pinstance);
if (rc != MMIO_SUCCESS) break;
lFilePosition = ffSeekToDataBegin(pmmioinfo, pinstance);
pinstance->lFileCurrentPosition = lFilePosition;
if (lFilePosition < 0) rc = MMIOERR_INTERNAL_SYSTEM;
}
break;
default:
rc = MMIOERR_INTERNAL_SYSTEM;
break;
}
if (rc != MMIO_SUCCESS) {
ioCleanUp(pmmioinfo);
pmmioinfo->ulErrorRet = rc;
return rc;
// valid return codes for MMIOM_OPEN are MMIO_SUCCESS or either
// a DOS error code or a MMIO error code is returned.
// return MMIO_ERROR;
}
#ifndef CANT_EDIT
// obtain PID used to mark clipboard entries and a dummy time stamp
DosGetInfoBlocks(&ptib, &ppib);
pinstance->pidPID = ppib->pib_ulpid;
DosGetDateTime(&(pinstance->dtClipbrdTime));
// set up the pathname in the instance structure for clipboard editing
if ((pszFileName != NULL) && (strlen(pszFileName) < CCHMAXPATH)) {
rc = ioEditGetFullName(pszFileName, (PSZ)&(pinstance->szFileName));
if (rc != MMIO_SUCCESS) {
pmmioinfo->ulErrorRet = rc;
return rc;
// return MMIO_ERROR;
}
pinstance->ulEditFlags |= FULLY_QUALIFIED_PATH;
}
else {
pinstance->szFileName[0] = '\0';
pinstance->ulEditFlags |= CANNOT_CUT_OR_COPY; // don't know the file name
} // can't put stuff into the clipboard
#endif
pmmioinfo->ulErrorRet = 0;
return MMIO_SUCCESS;
}