// vfs.c
// Author: Josh Holtrop
// Date: 03/11/04
// Modified: 03/16/04

#include "vfs.h"
#include "fs/vfat.h"
#include "hos_defines.h"
#include "block/rd.h"
#include "block/loop.h"

Volume *firstVolume = 0;
Volume *rootVolume = 0;

void vfs_init()
{
	if(*(byte *)BOOT_HASRD)	//bootloader loaded an initial ram disk
	{
		Volume *initrd = vfs_newVolume();
		RamDisk *rd = rd_newDisk(0xC0200000, 1440*1024);
		initrd->diskDevice = rd;
		initrd->deviceType = VFS_RD;
		strcpy(initrd->label, "rd0");
		initrd->link = 0;
		rootVolume = initrd;
	}
}


Volume *vfs_newVolume()
{
	Volume *vol = malloc(sizeof(Volume));
	vfs_getLastVolume()->link = vol;
	return vol;
}


Volume *vfs_getLastVolume()
{
	Volume *vol = firstVolume;
	while (vol)
		vol = vol->link;
	return vol;
}

int vfs_readSector(Volume *vol, dword sector, byte *buffer)
{
	switch(vol->deviceType)
	{
	case VFS_RD:
		return rd_readSector(vol->diskDevice, sector, buffer);
	case VFS_LOOP:
		return loop_readSector(vol->diskDevice, sector, buffer);
	default:
		return -1;
	}
}

int vfs_writeSector(Volume *vol, dword sector, byte *buffer)
{
	switch(vol->deviceType)
	{
	case VFS_RD:
		return rd_writeSector(vol->diskDevice, sector, buffer);
	case VFS_LOOP:
		return loop_writeSector(vol->diskDevice, sector, buffer);
	default:
		return -1;
	}
}

int vfs_readSectorn(Volume *vol, dword sector, byte *buffer, int n)
{
	int r;
	for (; n > 0; --n, ++sector, buffer += 512)
	{
		r = vfs_readSector(vol, sector, buffer);
		if (r) return r;
	}
	return 0;
}

int vfs_writeSectorn(Volume *vol, dword sector, byte *buffer, int n)
{
	int r;
	for (; n > 0; --n, ++sector, buffer += 512)
	{
		r = vfs_writeSector(vol, sector, buffer);
		if (r) return r;
	}
	return 0;
}

int vfs_readFileBlock(Volume *vol, char *file, dword start, byte *buffer, dword blockSize)
{
	switch(vol->fsType)
	{
	default:
		return -1;
	}
}


int vfs_writeFileBlock(Volume *vol, char *file, dword start, byte *buffer, dword blockSize)
{
	switch(vol->fsType)
	{
	default:
		return -1;
	}
}