diff -r 000000000000 -r a41df078684a kerneltest/f32test/server/t_resize.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/kerneltest/f32test/server/t_resize.cpp	Mon Oct 19 15:55:17 2009 +0100
@@ -0,0 +1,222 @@
+// 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++);
+		}
+	}