// vfs.c
// Author: Josh Holtrop
// Created: 12/31/03


void	vfs_init()
{
	byte	ramDiskPresent = *(byte *)0xC0090000;
	if (ramDiskPresent)
	{
		strcpy(rootDirectory, "rd0");
		firstDevice = malloc(sizeof(DeviceEntry));
		firstDevice->link = 0;
		firstDevice->diskDevice = malloc(sizeof(DiskDevice));
		firstDevice->diskDevice->type = VFS_DISK_RD;
		firstDevice->diskDevice->fileSystem = VFS_FS_FAT12;
		strcpy(firstDevice->diskDevice->id, "rd0");
		firstDevice->diskDevice->location = 0xC0200000;
	}
	else
	{
		rootDirectory[0] = 0;
	}
}


byte *vfs_readFile(char *fileName)
{
	char *newFileName = fileName;
	char	device[4];
	if (fileName[0] == '/')
	{
		newFileName = malloc(strlen(fileName)+4);
		strcpy(newFileName, rootDirectory);
		strcat(newFileName, fileName);
	}
	strcpy(device, newFileName);
	DiskDevice *dd = vfs_getDiskDeviceByID(device);

	if (newFileName != fileName)
		free(newFileName);
}


byte *vfs_readSector(DiskDevice *dd, dword sector)
{
	switch(dd->type)
	{
	case VFS_DISK_RD:
		return rd_readSector(dd, sector);
	}
	return 0;
}


DiskDevice *vfs_getDiskDeviceByID(char *id)
{
	DeviceEntry *de = firstDevice;
	for (;;)
	{
		if (strcmp(de->diskDevice->id, id))
			return de->diskDevice;
		de = (DeviceEntry *)de->link;
		if (!de)
			break;
	}
	return 0;
}