// Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of the License "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

// f32test\server\t_resize.cpp

// This program is designed to test the CFatFileCB::ResizeIndex() method,

// especially wrt defect EDNMDON-4J2EWK, which occured when the index was

// resized by an extreme amount.

// This program must be run on a FAT formatted disk with at least 10Mb free.

// RFile::SetSize(TInt aSize)

// 

//

#include <e32test.h>

#include <f32file.h>

#include <hal.h>

#include "t_server.h"

GLDEF_D RTest test(_L("T_RESIZE"));

// const TInt KBrutusUidValue=0x09080001;  	/* Never used */

// const TInt KWinsUidValue=0x00000001;		/* Never used */

const TInt K1K = 1 << 10;						// 1K

const TInt K4K = 4 * K1K;

const TInt K1Mb = 1 << 20;

const TInt KBigFileSize = 10 * K1Mb;			// 10Mb

const TInt KSmallFileSize = 10 * K1K;

const TInt KFillBufLength = K1K;

const TInt KNumberLength = 8;

const TInt KNumbersPerFillBuf = KFillBufLength / KNumberLength;

LOCAL_C TBool IsDiskValid(TInt aDrive);

LOCAL_C void FillBuf(TDes8 &aBuf, TInt aStart);

GLDEF_C void CallTestsL()

	{

//

// Test with drive nearly full

//

	CTrapCleanup* cleanup;						// create cleanup stack

	cleanup = CTrapCleanup::New();

 	__UHEAP_MARK;

	test.Title();

	test.Start(_L("Starting tests"));

	test.Next(_L("Connecting to file server."));

	TInt r;

	r = TheFs.Connect();

	test(r == KErrNone);

	if ( !gDriveToTest.IsLower() )

		{

		gDriveToTest.LowerCase();

		}

	TInt gDriveNumber;	// current drive number

	test((r = RFs::CharToDrive(gDriveToTest, gDriveNumber)) == KErrNone);

	if (IsDiskValid(gDriveNumber))

		{

		// Overflows occur because iSeekIndex is 128 elements long.

		// ASSUMES CLUSTER SIZE IS 512 BYTES

		// 1: Create a 10Mb file and resize it to 10k.

		// A 10Mb file will create force each member of CFatFileCB::iSeekIndex to

		// mark the start of 2^8 blocks (512 * 128 * 2^8 = 2^9 * 2^7 * 2^8 = 2^24 = 16777216)

		// A 10K file has an iSeekIndex with granularity 2^0 = 1 cluster.

		// skip half-words = (1<<(iSeekIndexSize-aNewMult))-1 = (1 << (8 - 0)) - 1 = 255.

		test.Next(_L("Creating file."));

		test.Printf(_L("Writing %08x file.\n"), KBigFileSize);

		RFile f;

		TFileName fn;

		fn.Format(_L("%c:\\resize.tst"), TUint(gDriveToTest));

		test((r = f.Create(TheFs, fn, EFileShareExclusive | EFileStream | EFileWrite)) == KErrNone);

		TInt i;								// bad for scope under VC

		TBuf8<KFillBufLength> buf;			// don't reconstruct for each iteration

		for (i = 0; i < KBigFileSize / KNumberLength; i += KNumbersPerFillBuf)

			{

			if (((i * KNumberLength) % (KBigFileSize / 32)) == 0)

				test.Printf(_L("writing to file posn %08x.\n"), i * 8);

			FillBuf(buf, i);

			test(f.Write(buf) == KErrNone);

			}

		// Resize the file to 10k.  This should cause CFatFileCB::iSeekIndex to be filled

		// with zeroes and not cause a Des16PanicDesIndexOutOfRange.

		test.Next(_L("Resizing file downwards.\n"));

		test.Printf(_L("Resizing %08x file to %08x.\n"), KBigFileSize, KSmallFileSize);

		f.SetSize(KSmallFileSize);

		// Re-read the file up to 10k to make sure it is navigated properly.

		test.Printf(_L("Checking first %08x bytes are maintained.\n"), KSmallFileSize);

		TInt startPos = 0;

		f.Seek(ESeekStart, startPos);

		TBuf8<KFillBufLength> buf2;			// don't reconstruct for each iteration

		for (i = 0; i < KSmallFileSize / KNumberLength; i += KNumbersPerFillBuf)

			{

			test(f.Read(buf) == KErrNone);

			test(buf.Length() == KFillBufLength);

			FillBuf(buf2, i);

			test(buf2.Compare(buf) == 0);

			}

		// 2: Resize the 10K file to 10Mb.

		//

		// iSeekIndex will be cleared because the resize loop is never executed.

		// TUint16* newVal=(TUint16*)ptr;

		// TInt step=1<<(aNewMult-iSeekIndexSize);	// 256

		// ptr+=step-1;								// ptr := &(*iSeekIndex[255])

		// while(ptr<ptrEnd && newVal<newValEnd)	// ptr > ptrEnd on first iteration

		// 	{

		// 	*newVal=*ptr;

		// 	newVal++;

		// 	ptr+=step;

		// 	}

		// while(newVal<ptrEnd)					// newVal == ptr on first iteration

		// 	*newVal++=0;						// just zero entire array

		test.Next(_L("Resizing file upwards.\n"));

		test.Printf(_L("Resizing %08x file to %08x."), KSmallFileSize, KBigFileSize);

		test(f.SetSize(KBigFileSize) == KErrNone);

		f.Seek(ESeekStart, startPos);

		for (i = 0; i < KBigFileSize / KNumberLength; i += KNumbersPerFillBuf)

			{

			if (((i * KNumberLength) % (KBigFileSize / 32)) == 0)

				test.Printf(_L("reading from file posn %08x.\n"), i * 8);

			test(f.Read(buf) == KErrNone);

			test(buf.Length() == KFillBufLength);

			if (i < (K4K / KNumberLength))

				{

				FillBuf(buf2, i);

				test(buf.Compare(buf2) == 0);

				}

			}

		f.Close();

		test( TheFs.Delete(fn) == KErrNone );

		}	// if (IsDiskValid(gDriveNumber))

//	TheFs.Close();	/* TheFs is being accessed by t_main's E32MAIN() after the test is complete. */

	test.End();

	test.Close();

	__UHEAP_MARKEND;

	delete cleanup;

	}

LOCAL_C TBool IsDiskValid(TInt aDrive)

// Returns ETrue if aDrive is a FAT formatted disk with KBigFileSize bytes free,

// EFalse otherwise.

	{

	TInt r;

	TInt isFat, isValid;

    TInt machUid;

    r=HAL::Get(HAL::EMachineUid,machUid);

    test(r==KErrNone);

//	test.Printf(_L("machUid = %08x.\n"), machUid);

	TBuf<16> fsName;							// _?_ length

    r = TheFs.FileSystemName(fsName, aDrive);

    test(r == KErrNone || r == KErrNotFound);

	test.Printf(_L("fsName = \"%S\".\n"), &fsName);

	if (machUid == HAL::EMachineUid_Brutus)

		{

		isFat = (fsName.CompareF(_L("Local")) == 0);

		}

	else

		{

		isFat = (fsName.CompareF(_L("Fat")) == 0);

		}

	test.Printf(_L("isFat = %x.\n"), isFat);

	if (! isFat)

		{

		isValid = EFalse;

		}

	else

		{

		TVolumeInfo vi;

		test((r = TheFs.Volume(vi, aDrive)) == KErrNone);

		test.Printf(_L("vi.iFree = %ld\n"), vi.iFree);

		isValid = (vi.iFree >= TInt64(KBigFileSize));

		}

	if (! isValid)

		{

		test.Printf(_L("IsDiskValid: Skipped because drive %d is not a valid FAT volume (with 10Mb free).\n"), aDrive);

		}

	return isValid;

	}

LOCAL_C void FillBuf(TDes8 &aBuf, TInt aStart)

// Fills aBuf with a list of ascending 8 digit numbers.

// Assumes aBuf.MaxLength() is divisible by 8.

	{

	aBuf.Zero();

	while (aBuf.Length() < aBuf.MaxLength())

		{

		aBuf.AppendFormat(_L8("%08x"), aStart++);

		}

	}