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/* -*- mode: C++; tab-width: 4 -*- */
/* ===================================================================== *\
Copyright (c) 2000-2001 Palm, Inc. or its subsidiaries.
All rights reserved.
This file is part of the Palm OS Emulator.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
\* ===================================================================== */
#include "EmCommon.h"
#include "EmTRGDiskIO.h"
/************************************************************************
* This class handles the generic low level disk access.
************************************************************************/
#include <stdio.h>
#include "EmCommon.h"
#include "EmTRGDiskIO.h"
#define CFFILE_NAME "trgdrv.dat"
#define SDFILE_NAME "trgdrvsd.dat"
#define SECTOR_SIZE 512
EmTRGDiskIO::EmTRGDiskIO()
{
m_driveNo = UNKNOWN_DRIVE;
}
EmTRGDiskIO::~EmTRGDiskIO()
{
}
char * EmTRGDiskIO::GetFilePath(int driveNo)
{
#if PLATFORM_WINDOWS
static char tmp[MAX_PATH];
if (driveNo == CF_DRIVE)
_snprintf(tmp, sizeof(tmp), "%s\\%s", getenv("WINDIR"), CFFILE_NAME);
else
_snprintf(tmp, sizeof(tmp), "%s\\%s", getenv("WINDIR"), SDFILE_NAME);
return(tmp);
#else
if (driveNo == CF_DRIVE)
return CFFILE_NAME;
else
return SDFILE_NAME;
#endif
}
int EmTRGDiskIO::Format(void)
{
EmSector *buffer;
uint32 num, lba;
FILE *fp;
fp = fopen(GetFilePath(m_driveNo), "wb");
if (fp == NULL)
return -1;
buffer = new EmSector;
num = m_currDisk.GetNumSectors(m_diskTypeID);
for (lba=0; lba<num; lba++)
{
m_currDisk.GetSector(m_diskTypeID, lba, buffer);
// The most probable error condition is
// attempting to write to a full drive ... it could also
// be write-protected, or on a disconnected network drive.
if (fwrite(buffer, SECTOR_SIZE, 1, fp) == 0)
{
delete buffer;
fclose(fp);
return -1;
}
}
delete buffer;
return 0;
}
int EmTRGDiskIO::Read(uint32 sectorNum, void *buffer)
{
FILE *fp;
if ((fp = fopen(GetFilePath(m_driveNo), "rb")) == NULL)
return -1;
if (fseek(fp, sectorNum * SECTOR_SIZE, SEEK_SET) == -1)
{
fclose(fp);
return -1;
}
if (fread(buffer, SECTOR_SIZE, 1, fp) != 1)
{
fclose(fp);
return -1;
}
fclose(fp);
return 0;
}
int EmTRGDiskIO::Write(uint32 sectorNum, void *buffer)
{
FILE *fp;
if ((fp = fopen(GetFilePath(m_driveNo), "r+b")) == NULL)
return -1;
if (fseek(fp, sectorNum * SECTOR_SIZE, SEEK_SET) == -1)
{
fclose(fp);
return -1;
}
if (fwrite(buffer, SECTOR_SIZE, 1, fp) != 1)
{
fclose(fp);
return -1;
}
fclose(fp);
return 0;
}
void EmTRGDiskIO::Initialize(EmDiskTypeID DiskTypeID, int driveNo)
{
m_diskTypeID = DiskTypeID;
m_driveNo = driveNo;
}
void EmTRGDiskIO::Dispose(void)
{
}
int EmTRGDiskIO::ReadSector(uint32 sectorNum, void *buffer)
{
int retval;
if ((retval = Read(sectorNum, buffer)) != 0)
{
Format();
retval = Read(sectorNum, buffer);
}
return retval;
}
int EmTRGDiskIO::WriteSector(uint32 sectorNum, void *buffer)
{
int retval;
if ((retval = Write(sectorNum, buffer)) != 0)
{
Format();
retval = Write(sectorNum, buffer);
}
return retval;
}
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