/*
 * PROJECT:     ReactOS Setup Library
 * LICENSE:     GPL-2.0+ (https://spdx.org/licenses/GPL-2.0+)
 * PURPOSE:     Filesystem support functions
 * COPYRIGHT:   Copyright 2003-2019 Casper S. Hornstrup (chorns@users.sourceforge.net)
 *              Copyright 2017-2019 Hermes Belusca-Maito
 */

//
// See also: https://git.reactos.org/?p=reactos.git;a=blob;f=reactos/dll/win32/fmifs/init.c;h=e895f5ef9cae4806123f6bbdd3dfed37ec1c8d33;hb=b9db9a4e377a2055f635b2fb69fef4e1750d219c
// for how to get FS providers in a dynamic way. In the (near) future we may
// consider merging some of this code with us into a fmifs / fsutil / fslib library...
//

/* INCLUDES *****************************************************************/

#include "precomp.h"

#include "partlist.h"
#include "fsrec.h"
#include "fsutil.h"

#include <fslib/vfatlib.h>
#include <fslib/btrfslib.h>
// #include <fslib/ext2lib.h>
// #include <fslib/ntfslib.h>

#define NDEBUG
#include <debug.h>


/* LOCALS *******************************************************************/

/** IFS_PROVIDER **/
typedef struct _FILE_SYSTEM
{
    PCWSTR FileSystemName;
    FORMATEX FormatFunc;
    CHKDSKEX ChkdskFunc;
} FILE_SYSTEM, *PFILE_SYSTEM;

/* The list of file systems on which we can install ReactOS */
static FILE_SYSTEM RegisteredFileSystems[] =
{
    /* NOTE: The FAT formatter automatically determines
     * whether it will use FAT-16 or FAT-32. */
    { L"FAT"  , VfatFormat, VfatChkdsk },
#if 0
    { L"FAT32", VfatFormat, VfatChkdsk }, // Do we support specific FAT sub-formats specifications?
    { L"FATX" , VfatxFormat, VfatxChkdsk },
    { L"NTFS" , NtfsFormat, NtfsChkdsk },
#endif
    { L"BTRFS", BtrfsFormatEx, BtrfsChkdskEx },
#if 0
    { L"EXT2" , Ext2Format, Ext2Chkdsk },
    { L"EXT3" , Ext2Format, Ext2Chkdsk },
    { L"EXT4" , Ext2Format, Ext2Chkdsk },
    { L"FFS"  , FfsFormat , FfsChkdsk  },
    { L"REISERFS", ReiserfsFormat, ReiserfsChkdsk },
#endif
};


/* FUNCTIONS ****************************************************************/

/** QueryAvailableFileSystemFormat() **/
BOOLEAN
GetRegisteredFileSystems(
    IN ULONG Index,
    OUT PCWSTR* FileSystemName)
{
    if (Index >= ARRAYSIZE(RegisteredFileSystems))
        return FALSE;

    *FileSystemName = RegisteredFileSystems[Index].FileSystemName;

    return TRUE;
}


/** GetProvider() **/
static PFILE_SYSTEM
GetFileSystemByName(
    IN PCWSTR FileSystemName)
{
#if 0 // Reenable when the list of registered FSes will again be dynamic

    PLIST_ENTRY ListEntry;
    PFILE_SYSTEM_ITEM Item;

    ListEntry = List->ListHead.Flink;
    while (ListEntry != &List->ListHead)
    {
        Item = CONTAINING_RECORD(ListEntry, FILE_SYSTEM_ITEM, ListEntry);
        if (Item->FileSystemName &&
            (wcsicmp(FileSystemName, Item->FileSystemName) == 0 ||
            /* Map FAT32 back to FAT */
            (wcsicmp(FileSystemName, L"FAT32") == 0 && wcsicmp(Item->FileSystemName, L"FAT") == 0)))
        {
            return Item;
        }

        ListEntry = ListEntry->Flink;
    }

#else

    ULONG Count = ARRAYSIZE(RegisteredFileSystems);
    PFILE_SYSTEM FileSystems = RegisteredFileSystems;

    ASSERT(FileSystems && Count != 0);

    while (Count--)
    {
        if (FileSystems->FileSystemName &&
            (wcsicmp(FileSystemName, FileSystems->FileSystemName) == 0 ||
            /* Map FAT32 back to FAT */
            (wcsicmp(FileSystemName, L"FAT32") == 0 && wcsicmp(FileSystems->FileSystemName, L"FAT") == 0)))
        {
            return FileSystems;
        }

        ++FileSystems;
    }

#endif

    return NULL;
}


/** ChkdskEx() **/
NTSTATUS
ChkdskFileSystem_UStr(
    IN PUNICODE_STRING DriveRoot,
    IN PCWSTR FileSystemName,
    IN BOOLEAN FixErrors,
    IN BOOLEAN Verbose,
    IN BOOLEAN CheckOnlyIfDirty,
    IN BOOLEAN ScanDrive,
    IN PFMIFSCALLBACK Callback)
{
    PFILE_SYSTEM FileSystem;

    FileSystem = GetFileSystemByName(FileSystemName);

    if (!FileSystem || !FileSystem->ChkdskFunc)
    {
        // BOOLEAN Argument = FALSE;
        // Callback(DONE, 0, &Argument);
        return STATUS_NOT_SUPPORTED;
    }

    return FileSystem->ChkdskFunc(DriveRoot,
                                  FixErrors,
                                  Verbose,
                                  CheckOnlyIfDirty,
                                  ScanDrive,
                                  Callback);
}

NTSTATUS
ChkdskFileSystem(
    IN PCWSTR DriveRoot,
    IN PCWSTR FileSystemName,
    IN BOOLEAN FixErrors,
    IN BOOLEAN Verbose,
    IN BOOLEAN CheckOnlyIfDirty,
    IN BOOLEAN ScanDrive,
    IN PFMIFSCALLBACK Callback)
{
    UNICODE_STRING DriveRootU;

    RtlInitUnicodeString(&DriveRootU, DriveRoot);
    return ChkdskFileSystem_UStr(&DriveRootU,
                                 FileSystemName,
                                 FixErrors,
                                 Verbose,
                                 CheckOnlyIfDirty,
                                 ScanDrive,
                                 Callback);
}


/** FormatEx() **/
NTSTATUS
FormatFileSystem_UStr(
    IN PUNICODE_STRING DriveRoot,
    IN PCWSTR FileSystemName,
    IN FMIFS_MEDIA_FLAG MediaFlag,
    IN PUNICODE_STRING Label,
    IN BOOLEAN QuickFormat,
    IN ULONG ClusterSize,
    IN PFMIFSCALLBACK Callback)
{
    PFILE_SYSTEM FileSystem;

    FileSystem = GetFileSystemByName(FileSystemName);

    if (!FileSystem || !FileSystem->FormatFunc)
    {
        // BOOLEAN Argument = FALSE;
        // Callback(DONE, 0, &Argument);
        return STATUS_NOT_SUPPORTED;
    }

    return FileSystem->FormatFunc(DriveRoot,
                                  MediaFlag,
                                  Label,
                                  QuickFormat,
                                  ClusterSize,
                                  Callback);
}

NTSTATUS
FormatFileSystem(
    IN PCWSTR DriveRoot,
    IN PCWSTR FileSystemName,
    IN FMIFS_MEDIA_FLAG MediaFlag,
    IN PCWSTR Label,
    IN BOOLEAN QuickFormat,
    IN ULONG ClusterSize,
    IN PFMIFSCALLBACK Callback)
{
    UNICODE_STRING DriveRootU;
    UNICODE_STRING LabelU;

    RtlInitUnicodeString(&DriveRootU, DriveRoot);
    RtlInitUnicodeString(&LabelU, Label);

    return FormatFileSystem_UStr(&DriveRootU,
                                 FileSystemName,
                                 MediaFlag,
                                 &LabelU,
                                 QuickFormat,
                                 ClusterSize,
                                 Callback);
}


//
// Formatting routines
//

BOOLEAN
PreparePartitionForFormatting(
    IN struct _PARTENTRY* PartEntry,
    IN PCWSTR FileSystemName)
{
    UCHAR PartitionType;

    if (!FileSystemName || !*FileSystemName)
    {
        DPRINT1("No file system specified?\n");
        return FALSE;
    }

    PartitionType = FileSystemToPartitionType(FileSystemName,
                                              &PartEntry->StartSector,
                                              &PartEntry->SectorCount);
    if (PartitionType == PARTITION_ENTRY_UNUSED)
    {
        /* Unknown file system */
        DPRINT1("Unknown file system '%S'\n", FileSystemName);
        return FALSE;
    }

    SetPartitionType(PartEntry, PartitionType);

//
// FIXME: Do this now, or after the partition was actually formatted??
//
    /* Set the new partition's file system proper */
    RtlStringCbCopyW(PartEntry->FileSystem,
                     sizeof(PartEntry->FileSystem),
                     FileSystemName);

    return TRUE;
}

/* EOF */