* Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).

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

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

* Description:

class RFs;

class CDeviceTypeInformation;

Constant conveying the size of the preallocated descriptor buffers used with 

the SysUtil version APIs.

@see SysUtil::GetSWVersion

@see SysUtil::GetLangSWVersion

@see SysUtil::GetLangVersion

@publishedAll

@released

SysUtil provides various system utility methods, as follows:

 - Functions for applications to retrieve SW and language package versions 

     strings for display purposes 

 - Functions to check whether there is free space on a disk drive before

     file creation or writing.

 - Functions to retrieve Device Type information (e.g. phone model) for display

     purposes.

Version, Attribute strings and free space thresholds are provisioned by 

the device creator into the ROM. For details on this see the

'SGL.TS0017.324 BAFL How-To FAQ Document' in the OS Developer Library.  

@publishedAll

@released

*/

    IMPORT_C static TInt GetPRInformation( TDes& aValue );

private:

    IMPORT_C static TBool FFSSpaceBelowCriticalLevel_OldL(

    IMPORT_C static TBool MMCSpaceBelowCriticalLevel_OldL(

    IMPORT_C static TBool DiskSpaceBelowCriticalLevel_OldL(

public:

    IMPORT_C static TInt GetMMCDriveLetter( RFs & aFs );

    IMPORT_C static TInt GetFFSDriveLetter( RFs & aFs );

public:

	IMPORT_C static CDeviceTypeInformation* GetDeviceTypeInfoL();

	IMPORT_C static TBool FFSSpaceBelowCriticalLevelL(

	           RFs* aFs,

	           TInt64 aBytesToWrite = 0 );

	IMPORT_C static TBool MMCSpaceBelowCriticalLevelL(

	           RFs* aFs,

	           TInt64 aBytesToWrite = 0 );

	IMPORT_C static TBool DiskSpaceBelowCriticalLevelL(

	           RFs* aFs,

	           TInt64 aBytesToWrite,

	           TInt aDrive );

	};

/**

This class is used to hold the device type information attributes and provides 

member functions to return the attribute values. These values are strings of 

UTF-16 characters and no format must be assumed or implied as it varies from 

one device manufacturer to the next. Please note that this information does not

identify a unique device but identifies the type of device.

An instance of this class cannot be created by user code. If device type 

information attributes are required then the user should use 

SysUtil::GetDeviceTypeInfoL which will return a pointer to an instance of this 

class. This instance will contain a full set of device type information 

attributes that have been provisioned by the device creator. For 

details of how these are provisioned see 'XXX xxx' document in the OS Developer 

Library.

For standard device type information attributes (attributes which are common 

to all device creators) named functions have been provided. These functions 

also offer the advantage of a default value being provided when an attribute 

has not been provisioned by the device creator. If a default value has been 

retrieved KDefaultValue will be returned.

Callers who do not care about whether a default value is retrieved or not can 

use the API as follows:

@code

	TPtrC16 modelNamePtrC;

	User::LeaveIfError( deviceTypeInfo->GetModelName(modelNamePtrC) );

@endcode

Where callers wish to avoid the default value it can be tested for as follows:

@code

	TPtrC16 modelNamePtrC;

	if (User::LeaveIfError( deviceTypeInfo->GetModelName(modelNamePtrC)) == CDeviceTypeInformation::KDefaultValue)

		{

		// We have a default attribute value, do something else

		...

		}

	else

		{

		// We have a device creator supplied attribute value.

		...

		}

@endcode

In addition to named functions, two additional generic functions are provided 

that can be used to retrieve any additional device type information attributes 

which may be provided by a device creator. These functions can also be used to 

retrieve the standard attributes; however, it is recommended that the named 

functions be used instead.

Any code which owns an instance of this class has the responsibility of 

destroying it. This may be achieved by calling delete on the pointer or using 

the CleanupStack.

@publishedAll

@released

*/

NONSHARABLE_CLASS(CDeviceTypeInformation) : public CBase

	{

public: //publishedAll

	/** 

	 The maximum length of a device attribute string value.

	 */

	static const TInt KMaxAttributeLength = 64;

	/** 

	 This const is a value returned from calls to the named

	 CDeviceTypeInformation APIs. It indicates to the caller that the returned 

	 device type information attribute, stored in CDeviceTypeInformation, is a 

	 default value. This occurs when the device creator does not provision the 

	 attribute value.

	 */

	static const TInt KDefaultValue = 1;

public: // publishedAll

	IMPORT_C ~CDeviceTypeInformation();

	static CDeviceTypeInformation* NewL();

	IMPORT_C TInt GetManufacturerName( TPtrC16& aValue ) const;	

	IMPORT_C TInt GetModelName( TPtrC16& aValue ) const;

	IMPORT_C TInt GetModelCode( TPtrC16& aValue ) const;

	IMPORT_C TInt GetRevisionID( TPtrC16& aValue ) const;

	IMPORT_C TInt GetDefaultDeviceName( TPtrC16& aValue ) const;

	IMPORT_C TInt GetUIPlatformName( TPtrC16& aValue ) const;

	IMPORT_C TInt GetUIPlatformVersion( TPtrC16&  aValue ) const;

	IMPORT_C TInt GetUIPlatformVersion( TUint16& aMajor, TUint16& aMinor ) const;

	IMPORT_C TInt GetOSVersion( TPtrC16& aValue ) const;

	IMPORT_C TInt GetOSVersion( TUint16& aMajor, TUint16& aMinor ) const;

public: // publishedPartner

	IMPORT_C TInt GetAttribute( const TUid& aAttributeUid, TPtrC16& aValue ) const;

private:

	CDeviceTypeInformation();

	void ConstructL();

private:

	class TImpl;

	TImpl* iImpl;

	};