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IOHEADER.C
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C/C++ Source or Header
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1994-11-17
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14KB
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273 lines
/*************************START OF SPECIFICATIONS *************************/
/* SOURCE FILE NAME: IOHEADER.C */
/* */
/* DESCRIPTIVE NAME: File Format IO Proc file header access module */
/* */
/* 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 routines to access the file */
/* header. */
/* */
/* NOTES: */
/* DEPENDENCIES: none */
/* RESTRICTIONS: Runs in 32 bit protect mode (OS/2 2.0) */
/* */
/* ENTRY POINTS: */
/* IOProcGetHeader */
/* IOProcQueryHeaderLength */
/* ioGetTrackHeader */
/* */
/************************* END OF SPECIFICATIONS **************************/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <memory.h>
#define INCL_DOS /* #define INCL_DOSPROCESS.*/
#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>
#include <ioi.h>
/************************** START OF SPECIFICATIONS *************************/
/* */
/* SUBROUTINE NAME: IOProcGetHeader */
/* */
/* DESCRIPTIVE NAME: Read MM Digital video header structure */
/* */
/* FUNCTION: copy either the standard presentation header or the file */
/* format specific header to the caller's buffer. */
/* */
/* NOTES: None */
/* */
/* ENTRY POINT: IOProcGetHeader */
/* LINKAGE: CALL FAR (00:32) */
/* */
/* INPUT: */
/* PMMIOINFO pmmioinfo - Pointer to MMIOINFO status structure */
/* LONG Unknown1 - Pointer to caller's buffer. */
/* LONG Unknown2 - Length of caller's buffer. */
/* */
/* EXIT-NORMAL: */
/* Length of header returned */
/* */
/* EXIT-ERROR: */
/* 0L */
/* */
/* SIDE EFFECTS: */
/* */
/*************************** END OF SPECIFICATIONS **************************/
LONG IOProcGetHeader ( PMMIOINFO pmmioinfo,
PVOID pHeader,
LONG lHeaderLength,
LONG lCurrentTrack )
{
LONG rc; /* return code */
PTRACKI ptracki;
PINSTANCE pinstance; /* Local work structure. */
/**************************************************************************/
/* Validates parameters passed: */
/* -- Must have valid pmmioinfo. */
/* -- File must be opened. */
/**************************************************************************/
if (rc = ioGetPtrInstance(pmmioinfo,&pinstance))
return(0L);
if (pHeader == NULL) {
pmmioinfo->ulErrorRet = MMIOERR_NO_BUFFER_ALLOCATED;
return(0L);
}
if (CheckMem((PVOID)pHeader, lHeaderLength, PAG_WRITE)) {
pmmioinfo->ulErrorRet = MMIOERR_INVALID_BUFFER_LENGTH;
return(0L);
}
if (pinstance->lCurrentTrack == MMIO_RESETTRACKS){
if(pmmioinfo->ulTranslate & MMIO_TRANSLATEHEADER){
if (lHeaderLength < pinstance->ulMmHdrLength) {
pmmioinfo->ulErrorRet = MMIOERR_INVALID_BUFFER_LENGTH;
return(0L);
}
lHeaderLength = pinstance->ulMmHdrLength;
memcpy(pHeader,pinstance->pmmhdr,lHeaderLength); // copy all fields
return (lHeaderLength);
}
else { /* not translateheader. */
if (lHeaderLength < pinstance->ulRawHdrLength) {
pmmioinfo->ulErrorRet = MMIOERR_INVALID_BUFFER_LENGTH;
return(0L);
}
lHeaderLength = pinstance->ulRawHdrLength;
memcpy(pHeader,pinstance->pRawHdr,lHeaderLength);
return(lHeaderLength);
}
}
else { /* Get a raw or translated track header */
if (ptracki = ioFindTracki(pinstance,(ULONG)pinstance->lCurrentTrack)) {
rc = ioGetTrackHeader(ptracki,
pHeader,
(ULONG)lHeaderLength,
pmmioinfo->ulTranslate & MMIO_TRANSLATEHEADER);
if (rc)
return(rc); /* ok, return length */
else {
pmmioinfo->ulErrorRet = MMIOERR_INVALID_BUFFER_LENGTH;
return(0L);
}
}
else { /* lCurrrent Track is not a valid track. */
pmmioinfo->ulErrorRet = MMIOERR_MATCH_NOT_FOUND;
return(0L);
}
}
}
/************************** START OF SPECIFICATIONS *************************/
/* */
/* SUBROUTINE NAME: ioGetTrackHeader */
/* */
/* DESCRIPTIVE NAME: Get Track header. */
/* */
/* FUNCTION: This function copies track header information to caller. */
/* */
/* */
/* NOTES: None */
/* */
/* ENTRY POINT: ioGetTracksHeader */
/* LINKAGE: CALL FAR (00:32) */
/* */
/* INPUT: */
/* PTRACKI ptracki - Pointer to track info */
/* PVOID pHeader - pointer to header. */
/* ULONG ulHeaderLength - Length of header. */
/* ULONG ulFlag - Raw or Translated */
/* */
/* EXIT-NORMAL: */
/* ulHeaderLength */
/* */
/* EXIT-ERROR: */
/* 0L */
/* */
/* */
/* SIDE EFFECTS: */
/* */
/*************************** END OF SPECIFICATIONS **************************/
LONG ioGetTrackHeader ( PTRACKI ptracki,
PVOID pTrackHeader,
ULONG ulHeaderLength,
ULONG ulFlag )
{
if (ulFlag & MMIO_TRANSLATEHEADER) {
/* Get translated header */
if (ulHeaderLength < ptracki->ulTrackHdrLength) {
return(0L);
}
ulHeaderLength = ptracki->ulTrackHdrLength;
memcpy(pTrackHeader,ptracki->pTrackHeader,ulHeaderLength);
}
else { /* Get raw header */
if (ulHeaderLength < ptracki->ulRawHdrLength) {
return(0L);
}
ulHeaderLength = ptracki->ulRawHdrLength;
memcpy(pTrackHeader,ptracki->pRawHdr,ulHeaderLength);
}
return(ulHeaderLength);
}
/************************** START OF SPECIFICATIONS *************************/
/* */
/* SUBROUTINE NAME: IOProcQueryHeaderLength */
/* */
/* DESCRIPTIVE NAME: Query header length of Digital Video file. */
/* */
/* FUNCTION: Returns either the length of translated header or the */
/* length of movieheader. */
/* */
/* */
/* NOTES: None */
/* */
/* ENTRY POINT: IOProcQueryHeaderLength */
/* LINKAGE: CALL FAR (00:32) */
/* */
/* INPUT: PMMIOINFO pmmioinfo - pointer to MMIOINFO status structure */
/* */
/* EXIT-NORMAL: */
/* MMIO_SUCCESS */
/* */
/* EXIT-ERROR: */
/* 0L */
/* */
/* */
/* SIDE EFFECTS: */
/* */
/*************************** END OF SPECIFICATIONS **************************/
LONG IOProcQueryHeaderLength ( PMMIOINFO pmmioinfo,
LONG lCurrentTrack )
{
LONG rc;
PINSTANCE pinstance; /* Local work structure. */
PTRACKI ptracki;
if (rc = ioGetPtrInstance(pmmioinfo,&pinstance))
return(0L);
if (pinstance->lCurrentTrack == MMIO_RESETTRACKS) {
if (pmmioinfo->ulTranslate & MMIO_TRANSLATEHEADER) {
return (pinstance->ulMmHdrLength);
}
else { /* Raw Header */
return(pinstance->ulRawHdrLength);
}
}
else {
if (ptracki = ioFindTracki(pinstance,(ULONG)pinstance->lCurrentTrack)) {
if (pmmioinfo->ulTranslate & MMIO_TRANSLATEHEADER) {
return(ptracki->ulTrackHdrLength);
}
else {
return(ptracki->ulRawHdrLength);
}
}
else {
pmmioinfo->ulErrorRet = MMIOERR_MATCH_NOT_FOUND;
return(MMIO_ERROR);
}
}
}