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drumfile.c
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C/C++ Source or Header
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1992-02-19
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8KB
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256 lines
/*------------------------------------------
DRUMFILE.C -- File I/O Routines for DRUM
(c) Charles Petzold, 1992
------------------------------------------*/
#include <windows.h>
extern "C" {
#include <mmsystem.h>
#include <commdlg.h>
}
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "drumdll.h"
#include "drumfile.h"
OPENFILENAME ofn = { sizeof (OPENFILENAME) } ;
char * szFilter[] = { "Drum Files (*.DRM)", "*.drm", "" } ;
char szDrumID [] = "DRUM" ;
char szListID [] = "LIST" ;
char szInfoID [] = "INFO" ;
char szSoftID [] = "ISFT" ;
char szDateID [] = "ISCD" ;
char szFmtID [] = "fmt " ;
char szDataID [] = "data" ;
char szSoftware [] = "DRUM by Charles Petzold, "
"PC Magazine, Vol. 11, Nos. 9-12" ;
char szErrorNoCreate [] = "File %s could not be opened for writing." ;
char szErrorCannotWrite [] = "File %s could not be written to. Disk full." ;
char szErrorNotFound [] = "File %s not found or cannot be opened." ;
char szErrorNotDrum [] = "File %s is not a standard DRUM file." ;
char szErrorUnsupported [] = "File %s is not a supported DRUM file." ;
char szErrorCannotRead [] = "File %s cannot be read." ;
BOOL DrumFileParse (char * szFileName, char * szTitleName)
{
static char szBuffer [_MAX_PATH] ;
if (_fullpath (szBuffer, szFileName, _MAX_PATH))
{
strcpy (szFileName, szBuffer) ;
if (!GetFileTitle (szFileName, szTitleName, _MAX_FNAME + _MAX_EXT))
return TRUE ;
}
return FALSE ;
}
BOOL DrumFileOpenDlg (HWND hwnd, char * szFileName, char * szTitleName)
{
ofn.hwndOwner = hwnd ;
ofn.lpstrFilter = szFilter [0] ;
ofn.lpstrFile = szFileName ;
ofn.nMaxFile = _MAX_PATH ;
ofn.lpstrFileTitle = szTitleName ;
ofn.nMaxFileTitle = _MAX_FNAME + _MAX_EXT ;
ofn.Flags = OFN_CREATEPROMPT ;
ofn.lpstrDefExt = "drm" ;
return GetOpenFileName (&ofn) ;
}
BOOL DrumFileSaveDlg (HWND hwnd, char * szFileName, char * szTitleName)
{
ofn.hwndOwner = hwnd ;
ofn.lpstrFilter = szFilter [0] ;
ofn.lpstrFile = szFileName ;
ofn.nMaxFile = _MAX_PATH ;
ofn.lpstrFileTitle = szTitleName ;
ofn.nMaxFileTitle = _MAX_FNAME + _MAX_EXT ;
ofn.Flags = OFN_OVERWRITEPROMPT ;
ofn.lpstrDefExt = "drm" ;
return GetSaveFileName (&ofn) ;
}
char * DrumFileWrite (DRUM * pdrum, char * szFileName)
{
char szDateBuf [16] ;
HMMIO hmmio ;
long lFormat = 1L ;
MMCKINFO mmckinfo [3] ;
struct tm * tmTime ;
time_t lTime ;
WORD wError = 0 ;
memset (mmckinfo, 0, 3 * sizeof (MMCKINFO)) ;
// Recreate the file for writing
if ((hmmio = mmioOpen (szFileName, NULL,
MMIO_CREATE | MMIO_WRITE | MMIO_ALLOCBUF)) == NULL)
return szErrorNoCreate ;
// Create a "RIFF" chunk with a "CPDR" type
mmckinfo[0].fccType = mmioStringToFOURCC (szDrumID, 0) ;
wError |= mmioCreateChunk (hmmio, &mmckinfo[0], MMIO_CREATERIFF) ;
// Create "LIST" sub-chunk with an "INFO" type
mmckinfo[1].fccType = mmioStringToFOURCC (szInfoID, 0) ;
wError |= mmioCreateChunk (hmmio, &mmckinfo[1], MMIO_CREATELIST) ;
// Create "ISFT" sub-sub-chunk
mmckinfo[2].ckid = mmioStringToFOURCC (szSoftID, 0) ;
wError |= mmioCreateChunk (hmmio, &mmckinfo[2], 0) ;
wError |= (mmioWrite (hmmio, szSoftware, sizeof (szSoftware)) !=
sizeof (szSoftware)) ;
wError |= mmioAscend (hmmio, &mmckinfo[2], 0) ;
// Create a time string
time (&lTime) ;
tmTime = localtime (&lTime) ;
wsprintf (szDateBuf, "%04d-%02d-%02d",
tmTime->tm_year + 1900, tmTime->tm_mon + 1, tmTime->tm_mday) ;
// Create "ISCD" sub-sub-chunk
mmckinfo[2].ckid = mmioStringToFOURCC (szDateID, 0) ;
wError |= mmioCreateChunk (hmmio, &mmckinfo[2], 0) ;
wError |= (mmioWrite (hmmio, szDateBuf, strlen (szDateBuf) + 1) !=
(long) strlen (szDateBuf) + 1) ;
wError |= mmioAscend (hmmio, &mmckinfo[2], 0) ;
wError |= mmioAscend (hmmio, &mmckinfo[1], 0) ;
// Create "fmt " sub-chunk
mmckinfo[1].ckid = mmioStringToFOURCC (szFmtID, 0) ;
wError |= mmioCreateChunk (hmmio, &mmckinfo[1], 0) ;
wError |= (mmioWrite (hmmio, (LPSTR) &lFormat, sizeof (long)) !=
sizeof (long)) ;
wError |= mmioAscend (hmmio, &mmckinfo[1], 0) ;
// Create the "data" sub-chunk
mmckinfo[1].ckid = mmioStringToFOURCC (szDataID, 0) ;
wError |= mmioCreateChunk (hmmio, &mmckinfo[1], 0) ;
wError |= (mmioWrite (hmmio, (LPSTR) pdrum, sizeof (DRUM)) !=
sizeof (DRUM)) ;
wError |= mmioAscend (hmmio, &mmckinfo[1], 0) ;
wError |= mmioAscend (hmmio, &mmckinfo[0], 0) ;
// Clean up and return
wError |= mmioClose (hmmio, 0) ;
if (wError)
{
mmioOpen (szFileName, NULL, MMIO_DELETE) ;
return szErrorCannotWrite ;
}
return NULL ;
}
char * DrumFileRead (DRUM * pdrum, char * szFileName)
{
DRUM drum ;
HMMIO hmmio ;
long lFormat ;
MMCKINFO mmckinfo [3] ;
memset (mmckinfo, 0, 2 * sizeof (MMCKINFO)) ;
// Open the file
if ((hmmio = mmioOpen (szFileName, NULL, MMIO_READ)) == NULL)
return szErrorNotFound ;
// Locate a "RIFF" chunk with a "DRUM" form-type
mmckinfo[0].ckid = mmioStringToFOURCC (szDrumID, 0) ;
if (mmioDescend (hmmio, &mmckinfo[0], NULL, MMIO_FINDRIFF))
{
mmioClose (hmmio, 0) ;
return szErrorNotDrum ;
}
// Locate, read, and verify the "fmt " sub-chunk
mmckinfo[1].ckid = mmioStringToFOURCC (szFmtID, 0) ;
if (mmioDescend (hmmio, &mmckinfo[1], &mmckinfo[0], MMIO_FINDCHUNK))
{
mmioClose (hmmio, 0) ;
return szErrorNotDrum ;
}
if (mmckinfo[1].cksize != sizeof (long))
{
mmioClose (hmmio, 0) ;
return szErrorUnsupported ;
}
if (mmioRead (hmmio, (LPSTR) &lFormat, sizeof (long)) != sizeof (long))
{
mmioClose (hmmio, 0) ;
return szErrorCannotRead ;
}
if (lFormat != 1)
{
mmioClose (hmmio, 0) ;
return szErrorUnsupported ;
}
// Go to end of "fmt " sub-chunk
mmioAscend (hmmio, &mmckinfo[1], 0) ;
// Locate, read, and verify the "data" sub-chunk
mmckinfo[1].ckid = mmioStringToFOURCC (szDataID, 0) ;
if (mmioDescend (hmmio, &mmckinfo[1], &mmckinfo[0], MMIO_FINDCHUNK))
{
mmioClose (hmmio, 0) ;
return szErrorNotDrum ;
}
if (mmckinfo[1].cksize != sizeof (DRUM))
{
mmioClose (hmmio, 0) ;
return szErrorUnsupported ;
}
if (mmioRead (hmmio, (LPSTR) &drum, sizeof (DRUM)) != sizeof (DRUM))
{
mmioClose (hmmio, 0) ;
return szErrorCannotRead ;
}
// Close the file and copy the DRUM structure data
mmioClose (hmmio, 0) ;
memcpy (pdrum, &drum, sizeof (DRUM)) ;
return NULL ;
}