/*

* Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "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:  Processes registry persistent data in XML.

*

*/

#include <e32base.h>

#include <f32file.h>

#include <libxml2_globals.h>

#include <libxml2_parser.h>

#include <charconv.h>

#include "WidgetBackupRegistryXml.h"

_LIT( KPropertyListVersion,  "PropertyListVersion" );

_LIT( KBundleIdentifier,     "BundleIdentifier" );

_LIT( KBundleName,           "BundleName" );

_LIT( KBundleDisplayName,    "BundleDisplayName" );

_LIT( KMainHTML,             "MainHTML" );

_LIT( KBundleShortVersion,   "BundleShortVersion" );

_LIT( KBundleVersion,        "BundleVersion" );

_LIT( KHeight,               "Height" );

_LIT( KWidth,                "Width" );

_LIT( KAllowFullAccess,      "AllowFullAccess" );

_LIT( KAllowNetworkAccess,   "AllowNetworkAccess" );

_LIT( KDriveName,            "DriveName" );

_LIT( KBasePath,             "BasePath" );

_LIT( KIconPath,             "IconPath" );

_LIT( KUrl,                  "Url" );

_LIT( KFileSize,             "FileSize" );

_LIT( KUid,                  "Uid" );

_LIT( KNokiaWidget,          "NokiaWidget" );

_LIT( KMiniViewEnabled,      "MiniViewEnabled" );

_LIT( KBlanketPermGranted,   "BlanketPermissionGranted" );         // optional

_LIT( KPreInstalled,         "PreInstalled" );                     // optional

// ============================================================================

// CWidgetBackupRegistryXml::NewL()

// two-phase constructor

//

// @since 5.0

// ============================================================================

//

CWidgetBackupRegistryXml* CWidgetBackupRegistryXml::NewL()

    {

    CWidgetBackupRegistryXml *self = new (ELeave) CWidgetBackupRegistryXml();

    CleanupStack::PushL( self );

    self->ConstructL();

    CleanupStack::Pop();

    return self;

    }

// ============================================================================

// CWidgetBackupRegistryXml::CWidgetBackupRegistryXml()

// C++ constructor

//

// @since 5.0

// ============================================================================

//

CWidgetBackupRegistryXml::CWidgetBackupRegistryXml() : iProperties(EWidgetPropertyIdCount)

    {

    }

// ============================================================================

// CWidgetUIConfigHandler::ConstructL()

// C++ constructor

//

// @since 5.0

// ============================================================================

//

void CWidgetBackupRegistryXml::ConstructL()

    {

    TWidgetProperty property;

    property.id = EWidgetPropertyListVersion;

    property.name.Set( KPropertyListVersion );

    property.type = EWidgetPropTypeInt;

    iProperties.AppendL(property);

    //

    property.id = EBundleIdentifier;

    property.name.Set( KBundleIdentifier );

    property.type = EWidgetPropTypeString;

    iProperties.AppendL(property);

    //

    property.id = EBundleName;

    property.name.Set( KBundleName );

    property.type = EWidgetPropTypeString;

    iProperties.AppendL(property);

    //

    property.id = EBundleDisplayName;

    property.name.Set( KBundleDisplayName );

    property.type = EWidgetPropTypeString;

    iProperties.AppendL(property);

    //

    property.id = EMainHTML;

    property.name.Set( KMainHTML );

    property.type = EWidgetPropTypeString;

    iProperties.AppendL(property);

    //

    property.id = EBundleShortVersion;

    property.name.Set( KBundleShortVersion );

    property.type = EWidgetPropTypeString;

    iProperties.AppendL(property);

    //

    property.id = EBundleVersion;

    property.name.Set( KBundleVersion );

    property.type = EWidgetPropTypeString;

    iProperties.AppendL(property);

    //

    property.id = EHeight;

    property.name.Set( KHeight );

    property.type = EWidgetPropTypeInt;

    iProperties.AppendL(property);

    //

    property.id = EWidth;

    property.name.Set( KWidth );

    property.type = EWidgetPropTypeInt;

    iProperties.AppendL(property);

    //

    property.id = EAllowFullAccess;

    property.name.Set( KAllowFullAccess );

    property.type = EWidgetPropTypeInt;

    iProperties.AppendL(property);

    //

    property.id = EAllowNetworkAccess;

    property.name.Set( KAllowNetworkAccess );

    property.type = EWidgetPropTypeInt;

    iProperties.AppendL(property);

    //

    property.id = EDriveName;

    property.name.Set( KDriveName );

    property.type = EWidgetPropTypeString;

    iProperties.AppendL(property);

    //

    property.id = EBasePath;

    property.name.Set( KBasePath );

    property.type = EWidgetPropTypeString;

    iProperties.AppendL(property);

    //

    property.id = EIconPath;

    property.name.Set( KIconPath );

    property.type = EWidgetPropTypeString;

    iProperties.AppendL(property);

    //

    property.id = EUrl;

    property.name.Set( KUrl );

    property.type = EWidgetPropTypeString;

    iProperties.AppendL(property);

    //

    property.id = EFileSize;

    property.name.Set( KFileSize );

    property.type = EWidgetPropTypeInt;

    iProperties.AppendL(property);

    //

    property.id = EUid;

    property.name.Set( KUid );

    property.type = EWidgetPropTypeInt; // not TUid

    iProperties.AppendL(property);

    //

    property.id = ENokiaWidget;

    property.name.Set( KNokiaWidget );

    property.type = EWidgetPropTypeInt;

    iProperties.AppendL(property);

    //

    property.id = EMiniViewEnable;

    property.name.Set( KMiniViewEnabled );

    property.type = EWidgetPropTypeInt;

    iProperties.AppendL(property);

    //

    property.id = EBlanketPermGranted;

    property.name.Set( KBlanketPermGranted );

    property.type = EWidgetPropTypeInt;

    iProperties.AppendL(property);

    //

    property.id = EPreInstalled;

    property.name.Set( KPreInstalled );

    property.type = EWidgetPropTypeInt;

    iProperties.AppendL(property);

    }

// ============================================================================

// CWidgetBackupRegistryXml::~CWidgetBackupRegistryXml()

// destructor

//

// @since 5.0

// ============================================================================

//

CWidgetBackupRegistryXml::~CWidgetBackupRegistryXml()

    {

    for (TInt i = iProperties.Count() - 1; i >= EWidgetPropertyIdCount; i--)

        {

        TUint16* name = const_cast<TUint16*>(iProperties[i].name.Ptr());

        iProperties[i].name.Set(KNullDesC);

        delete [] name;

        }

    iProperties.Reset();

    iProperties.Close();

    }

// ============================================================================

// Get the property descriptiont by finding entry for name.

//

// @param aPropName The name of the prop: <prop>propName</prop>

// @since 5.0

// @return prop type.

// ============================================================================

//

TInt CWidgetBackupRegistryXml::GetPropertyId(

    const TDesC& aPropName )

    {

    TInt i = 0;

    for (; i < iProperties.Count(); ++i )

        {

        // use case insensitive match for property names

        if ( 0 == aPropName.CompareF( iProperties[i].name ) )

            {

            return iProperties[i].id;

            }

        }

    TUint16* name = NULL;

    name = new TUint16 [aPropName.Length()];

    if (name)

        {

        TPtr namePtr(name, aPropName.Length());

        namePtr.Copy(aPropName);

        TWidgetProperty property;

        property.id = iProperties.Count();

        property.name.Set( namePtr );

        property.type = EWidgetPropTypeUnknown;

        TInt err = iProperties.Append(property);

        if (err == KErrNone)

            {

            return iProperties.Count() - 1;

            }

        delete name;

        }

    return EWidgetPropertyIdInvalid;

    }

// ============================================================================

// Get the property name from the property id. Used in entry Externalize

//

// @param aPropertyId property id

// @since 5.0

// @return property name.

// ============================================================================

//

const TPtrC& CWidgetBackupRegistryXml::XmlPropertyName(

    TInt aPropertyId )

    {

    for ( TInt i = 0; i < iProperties.Count(); i++ )

        {

        if ( iProperties[i].id == aPropertyId )

            {

            return iProperties[i].name;

            }

        }

    return iProperties[0].name; // should never get here

    }

// ============================================================================

// CWidgetBackupRegistryXml::ToUnicodeL

// Utility to bundle transcoding to unicode steps.

//

// @since 5.0

// @param aEncoding input buffer encoding

// @param aUnicodeSizeMultiplier how many bytes of input make one unicode char

// @param aInBuf input data in encoding

// @param aOutBuf malloc'ed output buf, caller takes ownership

// @param aFileSession CCnvCharacterSetConverter requires it

// ============================================================================

//

void CWidgetBackupRegistryXml::ToUnicodeL( TInt aEncoding,

                                     TInt aUnicodeSizeMultiplier,

                                     TPtrC8 aInBuf, HBufC16** aOutBuf,

                                     RFs& aFileSession )

    {

    *aOutBuf = NULL;

    // outbuf sizing and alloction

    HBufC16* outBuf = HBufC16::NewLC(aUnicodeSizeMultiplier * aInBuf.Length());

    TPtr16 outPtr = outBuf->Des();

    // convert to unicode

    CCnvCharacterSetConverter* charConv = CCnvCharacterSetConverter::NewLC();

    charConv->PrepareToConvertToOrFromL( aEncoding, aFileSession );

    TInt state = CCnvCharacterSetConverter::KStateDefault;

    TInt rep = 0; // number of unconvertible characters

    TInt rIndx = 0; // index of first unconvertible character

    User::LeaveIfError(

        charConv->ConvertToUnicode( outPtr, aInBuf, state, rep, rIndx ) );

    CleanupStack::PopAndDestroy( charConv );

    CleanupStack::Pop( outBuf );

    *aOutBuf = outBuf;

    }

// ============================================================================

// CWidgetBackupRegistryXml::FromUnicodeL

// Utility to bundle transcoding to unicode steps.

//

// @since 5.0

// @param aEncoding input buffer encoding

// @param aUnicodeSizeMultiplier how many bytes of input make one unicode char

// @param aInBuf input data in encoding

// @param aOutBuf malloc'ed output buf, caller takes ownership

// @param aFileSession CCnvCharacterSetConverter requires it

// ============================================================================

//

void CWidgetBackupRegistryXml::FromUnicodeL( TInt aEncoding,

                                     TInt aUnicodeSizeMultiplier,

                                     TPtrC16 aInBuf, HBufC8** aOutBuf,

                                     RFs& aFileSession )

    {

    *aOutBuf = NULL;

    // outbuf sizing and alloction

    HBufC8* outBuf = HBufC8::NewLC(aUnicodeSizeMultiplier * (aInBuf.Length() + 1));

    TPtr8 outPtr = outBuf->Des();

    // convert from unicode

    CCnvCharacterSetConverter* charConv = CCnvCharacterSetConverter::NewLC();

    charConv->PrepareToConvertToOrFromL( aEncoding, aFileSession );

    User::LeaveIfError(

        charConv->ConvertFromUnicode( outPtr, aInBuf));

    outPtr.ZeroTerminate();

    CleanupStack::PopAndDestroy( charConv );

    CleanupStack::Pop( outBuf ); 

    *aOutBuf = outBuf;

    }

// ============================================================================

// CWidgetBackupRegistryXml::GetContentL

// Utility to bundle extraction of XML text content

//

// @since 5.0

// @param aEncoding input buffer encoding

// @param aUnicodeSizeMultiplier how many bytes of input make one unicode char

// @param aInBuf input data in encoding

// @param aOutBuf malloc'ed output buf, caller takes ownership

// @param aFileSession CCnvCharacterSetConverter requires it

// ============================================================================

//

void CWidgetBackupRegistryXml::GetContentL( RFs& aFileSession,

                                      xmlDocPtr aDoc,

                                      xmlNode* aNode,

                                      HBufC** aContent )

    {

    // xml uses UTF-8 for the internal representation

    xmlChar* xmlContent =

        xmlNodeListGetString( aDoc, aNode, 1 /* expand entities inline */);

    if ( NULL == xmlContent )

        {

        User::Leave( OOM_FLAG ? KErrNoMemory : KErrCorrupt );

        }

    // we must transcode UTF-8 to UCS-2 (historical

    // and now inaccurate name "unicode")

    CleanupStack::PushL( xmlContent );

    TPtrC8 content( xmlContent );

    ToUnicodeL( KCharacterSetIdentifierUtf8, 2,

                content, aContent, aFileSession );

    CleanupStack::PopAndDestroy(); // xmlContent equivalent to xmlFree()

    if ( NULL == *aContent )

        {

        User::Leave( KErrCorrupt );

        }

    }

// ============================================================================

// CWidgetBackupRegistryXml::GetTextContentAsStringL

//

// ============================================================================

//

void CWidgetBackupRegistryXml::GetTextContentAsStringL( RFs& aFileSession, xmlDocPtr aDoc,

                                                  xmlNode* aNode, HBufC** aContent )

    {

    HBufC* tmpBuf = NULL;

    TInt len = 0;

    GetSubtreeAsStringL (aFileSession, aDoc, aNode, NULL, len);

    tmpBuf = HBufC::NewLC(len);

    GetSubtreeAsStringL (aFileSession, aDoc, aNode, &tmpBuf, len);

    *aContent = tmpBuf;

    CleanupStack::Pop(); // tmpBuf

    }

void  CWidgetBackupRegistryXml::GetSubtreeAsStringL (RFs& aFileSession, xmlDocPtr aDoc, xmlNode* aNode, HBufC** aBuf, TInt& aLen)

    {

    xmlNode* node = aNode;

    switch (node->type)

        {

        case XML_ELEMENT_NODE:

            {

            const xmlChar* name = node->name;

            TPtrC8 tmpName(name);

            if (aBuf)

                {

                HBufC* tmpBuf = NULL;

                ToUnicodeL( KCharacterSetIdentifierUtf8, 2,

                            tmpName, &tmpBuf, aFileSession );

                CleanupStack::PushL(tmpBuf);

                (*aBuf)->Des().Append(_L("<"));

                (*aBuf)->Des().Append(*tmpBuf);

                (*aBuf)->Des().Append(_L(">"));

                if (node->children)

                    {

                    GetSubtreeAsStringL (aFileSession, aDoc, node->children, aBuf, aLen);

                    }

                (*aBuf)->Des().Append(_L("</"));

                (*aBuf)->Des().Append(*tmpBuf);

                (*aBuf)->Des().Append(_L(">"));

                CleanupStack::PopAndDestroy(tmpBuf);

                }

            else

                {

                aLen += (5 + 2 * tmpName.Length());

                if (node->children)

                    {

                    GetSubtreeAsStringL (aFileSession, aDoc, node->children, aBuf, aLen);

                    }

                }

            break;

            }

        //case XML_ATTRIBUTE_NODE:

        case XML_TEXT_NODE:

            {

            xmlChar* content = node->content;

            TPtrC8 tmpContent(content);

            if (aBuf)

                {

                HBufC* tmpBuf = NULL;

                xmlChar* encodedContent = EncodeStringL(aDoc, content);

                CleanupStack::PushL( encodedContent );

                TPtrC8 encodedContentPtr(encodedContent);

                ToUnicodeL( KCharacterSetIdentifierUtf8, 2,

                            encodedContentPtr, &tmpBuf, aFileSession );

                CleanupStack::PushL(tmpBuf);

                (*aBuf)->Des().Append(*tmpBuf);

                CleanupStack::PopAndDestroy(2); // encodedContent, tmpBuf

                }

            else

                {

                aLen += EncodedStringLength(tmpContent);

                }

            break;

            }

        case XML_CDATA_SECTION_NODE:

            {

            xmlChar* content = node->content;

            TPtrC8 tmpContent(content);

            if (aBuf)

                {

                HBufC* tmpBuf = NULL;

                ToUnicodeL( KCharacterSetIdentifierUtf8, 2,

                            content, &tmpBuf, aFileSession);

                CleanupStack::PushL(tmpBuf);

                (*aBuf)->Des().Append(_L("<![CDATA["));

                (*aBuf)->Des().Append(*tmpBuf);

                (*aBuf)->Des().Append(_L("]]>"));

                CleanupStack::PopAndDestroy(); // tmpBuf

                }

            else

                {

                aLen += (12 + tmpContent.Length());

                }

            break;

            }

        //case XML_ENTITY_REF_NODE:

        //case XML_ENTITY_NODE:

        //case XML_PI_NODE:

        //case XML_COMMENT_NODE:

        //case XML_DOCUMENT_NODE:

        //case XML_DOCUMENT_TYPE_NODE:

        //case XML_DOCUMENT_FRAG_NODE:

        //case XML_NOTATION_NODE:

        //case XML_HTML_DOCUMENT_NODE:

        //case XML_DTD_NODE:

        //case XML_ELEMENT_DECL:

        //case XML_ATTRIBUTE_DECL:

        //case XML_ENTITY_DECL:

        //case XML_NAMESPACE_DECL:

        //case XML_XINCLUDE_START:

        //case XML_XINCLUDE_END:

        }

    if (node->next)

        {

        node = node->next;

        GetSubtreeAsStringL(aFileSession, aDoc, node, aBuf, aLen);

        }

    }

xmlChar* CWidgetBackupRegistryXml::EncodeStringL(xmlDocPtr aDoc, xmlChar* aStringToConvert)

    {

    xmlChar* noEntitiesContent = xmlEncodeSpecialChars(aDoc, aStringToConvert);

    if ( NULL == noEntitiesContent )

        {

        User::Leave( OOM_FLAG ? KErrNoMemory : KErrCorrupt );

        }

    return noEntitiesContent;

    }

HBufC* CWidgetBackupRegistryXml::EncodeStringL(xmlDocPtr aDoc, TPtrC aStringToConvert, RFs& aFileSession)

    {

    HBufC8* out = NULL;

    FromUnicodeL( KCharacterSetIdentifierUtf8, 2, aStringToConvert, &out, aFileSession );

    CleanupStack::PushL(out);

    xmlChar* noEntitiesContent = xmlEncodeSpecialChars(aDoc, out->Des().Ptr());

    if ( NULL == noEntitiesContent )

        {

        User::Leave( OOM_FLAG ? KErrNoMemory : KErrCorrupt );

        }

    CleanupStack::PushL( noEntitiesContent );

    TPtrC8 noEntitiesPtr(noEntitiesContent);